--- a/rhodecode/public/css/codemirror.css	Wed Jun 05 01:16:42 2013 +0200
+++ b/rhodecode/public/css/codemirror.css	Thu Jun 20 22:43:57 2013 +0200
@@ -1,174 +1,246 @@
+/* BASICS */
+
 .CodeMirror {
-  line-height: 1em;
+  /* Set height, width, borders, and global font properties here */
   font-family: monospace;
+  height: 300px;
+}
+.CodeMirror-scroll {
+  /* Set scrolling behaviour here */
+  overflow: auto;
+}
+
+/* PADDING */
+
+.CodeMirror-lines {
+  padding: 4px 0; /* Vertical padding around content */
+}
+.CodeMirror pre {
+  padding: 0 4px; /* Horizontal padding of content */
+}
+
+.CodeMirror-scrollbar-filler {
+  background-color: white; /* The little square between H and V scrollbars */
+}
+
+/* GUTTER */
+
+.CodeMirror-gutters {
+  border-right: 1px solid #ddd;
+  background-color: #f7f7f7;
+}
+.CodeMirror-linenumbers {}
+.CodeMirror-linenumber {
+  padding: 0 3px 0 5px;
+  min-width: 20px;
+  text-align: right;
+  color: #999;
+}
+
+/* CURSOR */
 
-  /* Necessary so the scrollbar can be absolutely positioned within the wrapper on Lion. */
+.CodeMirror div.CodeMirror-cursor {
+  border-left: 1px solid black;
+  z-index: 3;
+}
+/* Shown when moving in bi-directional text */
+.CodeMirror div.CodeMirror-secondarycursor {
+  border-left: 1px solid silver;
+}
+.CodeMirror.cm-keymap-fat-cursor div.CodeMirror-cursor {
+  width: auto;
+  border: 0;
+  background: #7e7;
+  z-index: 1;
+}
+/* Can style cursor different in overwrite (non-insert) mode */
+.CodeMirror div.CodeMirror-cursor.CodeMirror-overwrite {}
+
+.cm-tab { display: inline-block; }
+
+/* DEFAULT THEME */
+
+.cm-s-default .cm-keyword {color: #708;}
+.cm-s-default .cm-atom {color: #219;}
+.cm-s-default .cm-number {color: #164;}
+.cm-s-default .cm-def {color: #00f;}
+.cm-s-default .cm-variable {color: black;}
+.cm-s-default .cm-variable-2 {color: #05a;}
+.cm-s-default .cm-variable-3 {color: #085;}
+.cm-s-default .cm-property {color: black;}
+.cm-s-default .cm-operator {color: black;}
+.cm-s-default .cm-comment {color: #a50;}
+.cm-s-default .cm-string {color: #a11;}
+.cm-s-default .cm-string-2 {color: #f50;}
+.cm-s-default .cm-meta {color: #555;}
+.cm-s-default .cm-error {color: #f00;}
+.cm-s-default .cm-qualifier {color: #555;}
+.cm-s-default .cm-builtin {color: #30a;}
+.cm-s-default .cm-bracket {color: #997;}
+.cm-s-default .cm-tag {color: #170;}
+.cm-s-default .cm-attribute {color: #00c;}
+.cm-s-default .cm-header {color: blue;}
+.cm-s-default .cm-quote {color: #090;}
+.cm-s-default .cm-hr {color: #999;}
+.cm-s-default .cm-link {color: #00c;}
+
+.cm-negative {color: #d44;}
+.cm-positive {color: #292;}
+.cm-header, .cm-strong {font-weight: bold;}
+.cm-em {font-style: italic;}
+.cm-link {text-decoration: underline;}
+
+.cm-invalidchar {color: #f00;}
+
+div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;}
+div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
+
+/* STOP */
+
+/* The rest of this file contains styles related to the mechanics of
+   the editor. You probably shouldn't touch them. */
+
+.CodeMirror {
+  line-height: 1;
   position: relative;
-  /* This prevents unwanted scrollbars from showing up on the body and wrapper in IE. */
   overflow: hidden;
+  background: white;
+  color: black;
 }
 
 .CodeMirror-scroll {
-  overflow: auto;
-  height: 300px;
-  /* This is needed to prevent an IE[67] bug where the scrolled content
-     is visible outside of the scrolling box. */
+  /* 30px is the magic margin used to hide the element's real scrollbars */
+  /* See overflow: hidden in .CodeMirror */
+  margin-bottom: -30px; margin-right: -30px;
+  padding-bottom: 30px; padding-right: 30px;
+  height: 100%;
+  outline: none; /* Prevent dragging from highlighting the element */
   position: relative;
-  outline: none;
+}
+.CodeMirror-sizer {
+  position: relative;
 }
 
-/* Vertical scrollbar */
-.CodeMirror-scrollbar {
+/* The fake, visible scrollbars. Used to force redraw during scrolling
+   before actuall scrolling happens, thus preventing shaking and
+   flickering artifacts. */
+.CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler {
   position: absolute;
+  z-index: 6;
+  display: none;
+}
+.CodeMirror-vscrollbar {
   right: 0; top: 0;
   overflow-x: hidden;
   overflow-y: scroll;
-  z-index: 5;
-}
-.CodeMirror-scrollbar-inner {
-  /* This needs to have a nonzero width in order for the scrollbar to appear
-     in Firefox and IE9. */
-  width: 1px;
 }
-.CodeMirror-scrollbar.cm-sb-overlap {
-  /* Ensure that the scrollbar appears in Lion, and that it overlaps the content
-     rather than sitting to the right of it. */
-  position: absolute;
-  z-index: 1;
-  float: none;
-  right: 0;
-  min-width: 12px;
+.CodeMirror-hscrollbar {
+  bottom: 0; left: 0;
+  overflow-y: hidden;
+  overflow-x: scroll;
 }
-.CodeMirror-scrollbar.cm-sb-nonoverlap {
-  min-width: 12px;
-}
-.CodeMirror-scrollbar.cm-sb-ie7 {
-  min-width: 18px;
+.CodeMirror-scrollbar-filler {
+  right: 0; bottom: 0;
+  z-index: 6;
 }
 
-.CodeMirror-gutter {
+.CodeMirror-gutters {
   position: absolute; left: 0; top: 0;
-  z-index: 10;
-  background-color: #f7f7f7;
-  border-right: 1px solid #eee;
-  min-width: 2em;
   height: 100%;
+  padding-bottom: 30px;
+  z-index: 3;
 }
-.CodeMirror-gutter-text {
-  color: #aaa;
-  text-align: right;
-  padding: .4em .2em .4em .4em;
-  white-space: pre !important;
+.CodeMirror-gutter {
+  height: 100%;
+  padding-bottom: 30px;
+  margin-bottom: -32px;
+  display: inline-block;
+  /* Hack to make IE7 behave */
+  *zoom:1;
+  *display:inline;
+}
+.CodeMirror-gutter-elt {
+  position: absolute;
   cursor: default;
+  z-index: 4;
 }
+
 .CodeMirror-lines {
-  padding: .4em;
-  white-space: pre;
   cursor: text;
 }
-
 .CodeMirror pre {
-  -moz-border-radius: 0;
-  -webkit-border-radius: 0;
-  -o-border-radius: 0;
-  border-radius: 0;
-  border-width: 0; margin: 0; padding: 0; background: transparent;
+  /* Reset some styles that the rest of the page might have set */
+  -moz-border-radius: 0; -webkit-border-radius: 0; border-radius: 0;
+  border-width: 0;
+  background: transparent;
   font-family: inherit;
   font-size: inherit;
-  padding: 0; margin: 0;
+  margin: 0;
   white-space: pre;
   word-wrap: normal;
   line-height: inherit;
   color: inherit;
+  z-index: 2;
+  position: relative;
   overflow: visible;
 }
-
 .CodeMirror-wrap pre {
   word-wrap: break-word;
   white-space: pre-wrap;
   word-break: normal;
 }
+.CodeMirror-linebackground {
+  position: absolute;
+  left: 0; right: 0; top: 0; bottom: 0;
+  z-index: 0;
+}
+
+.CodeMirror-linewidget {
+  position: relative;
+  z-index: 2;
+  overflow: auto;
+}
+
+.CodeMirror-widget {
+  display: inline-block;
+}
+
 .CodeMirror-wrap .CodeMirror-scroll {
   overflow-x: hidden;
 }
 
-.CodeMirror textarea {
-  outline: none !important;
+.CodeMirror-measure {
+  position: absolute;
+  width: 100%; height: 0px;
+  overflow: hidden;
+  visibility: hidden;
 }
+.CodeMirror-measure pre { position: static; }
 
-.CodeMirror pre.CodeMirror-cursor {
-  z-index: 10;
+.CodeMirror div.CodeMirror-cursor {
   position: absolute;
   visibility: hidden;
-  border-left: 1px solid black;
   border-right: none;
   width: 0;
 }
-.cm-keymap-fat-cursor pre.CodeMirror-cursor {
-  width: auto;
-  border: 0;
-  background: transparent;
-  background: rgba(0, 200, 0, .4);
-  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#6600c800, endColorstr=#4c00c800);
-}
-/* Kludge to turn off filter in ie9+, which also accepts rgba */
-.cm-keymap-fat-cursor pre.CodeMirror-cursor:not(#nonsense_id) {
-  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
-}
-.CodeMirror pre.CodeMirror-cursor.CodeMirror-overwrite {}
-.CodeMirror-focused pre.CodeMirror-cursor {
+.CodeMirror-focused div.CodeMirror-cursor {
   visibility: visible;
 }
 
-div.CodeMirror-selected { background: #d9d9d9; }
-.CodeMirror-focused div.CodeMirror-selected { background: #d7d4f0; }
+.CodeMirror-selected { background: #d9d9d9; }
+.CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }
 
-.CodeMirror-searching {
+.cm-searching {
   background: #ffa;
   background: rgba(255, 255, 0, .4);
 }
 
-/* Default theme */
-
-.cm-s-default span.cm-keyword {color: #708;}
-.cm-s-default span.cm-atom {color: #219;}
-.cm-s-default span.cm-number {color: #164;}
-.cm-s-default span.cm-def {color: #00f;}
-.cm-s-default span.cm-variable {color: black;}
-.cm-s-default span.cm-variable-2 {color: #05a;}
-.cm-s-default span.cm-variable-3 {color: #085;}
-.cm-s-default span.cm-property {color: black;}
-.cm-s-default span.cm-operator {color: black;}
-.cm-s-default span.cm-comment {color: #a50;}
-.cm-s-default span.cm-string {color: #a11;}
-.cm-s-default span.cm-string-2 {color: #f50;}
-.cm-s-default span.cm-meta {color: #555;}
-.cm-s-default span.cm-error {color: #f00;}
-.cm-s-default span.cm-qualifier {color: #555;}
-.cm-s-default span.cm-builtin {color: #30a;}
-.cm-s-default span.cm-bracket {color: #997;}
-.cm-s-default span.cm-tag {color: #170;}
-.cm-s-default span.cm-attribute {color: #00c;}
-.cm-s-default span.cm-header {color: blue;}
-.cm-s-default span.cm-quote {color: #090;}
-.cm-s-default span.cm-hr {color: #999;}
-.cm-s-default span.cm-link {color: #00c;}
-
-span.cm-header, span.cm-strong {font-weight: bold;}
-span.cm-em {font-style: italic;}
-span.cm-emstrong {font-style: italic; font-weight: bold;}
-span.cm-link {text-decoration: underline;}
-
-span.cm-invalidchar {color: #f00;}
-
-div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;}
-div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
+/* IE7 hack to prevent it from returning funny offsetTops on the spans */
+.CodeMirror span { *vertical-align: text-bottom; }
 
 @media print {
-
   /* Hide the cursor when printing */
-  .CodeMirror pre.CodeMirror-cursor {
+  .CodeMirror div.CodeMirror-cursor {
     visibility: hidden;
   }
-
 }

--- a/rhodecode/public/js/codemirror.js	Wed Jun 05 01:16:42 2013 +0200
+++ b/rhodecode/public/js/codemirror.js	Thu Jun 20 22:43:57 2013 +0200
@@ -1,2039 +1,3154 @@
-// All functions that need access to the editor's state live inside
-// the CodeMirror function. Below that, at the bottom of the file,
-// some utilities are defined.
-
 // CodeMirror is the only global var we claim
 window.CodeMirror = (function() {
   "use strict";
-  // This is the function that produces an editor instance. Its
-  // closure is used to store the editor state.
-  function CodeMirror(place, givenOptions) {
+
+  // BROWSER SNIFFING
+
+  // Crude, but necessary to handle a number of hard-to-feature-detect
+  // bugs and behavior differences.
+  var gecko = /gecko\/\d/i.test(navigator.userAgent);
+  var ie = /MSIE \d/.test(navigator.userAgent);
+  var ie_lt8 = ie && (document.documentMode == null || document.documentMode < 8);
+  var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
+  var webkit = /WebKit\//.test(navigator.userAgent);
+  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
+  var chrome = /Chrome\//.test(navigator.userAgent);
+  var opera = /Opera\//.test(navigator.userAgent);
+  var safari = /Apple Computer/.test(navigator.vendor);
+  var khtml = /KHTML\//.test(navigator.userAgent);
+  var mac_geLion = /Mac OS X 1\d\D([7-9]|\d\d)\D/.test(navigator.userAgent);
+  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
+  var phantom = /PhantomJS/.test(navigator.userAgent);
+
+  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
+  // This is woefully incomplete. Suggestions for alternative methods welcome.
+  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
+  var mac = ios || /Mac/.test(navigator.platform);
+  var windows = /windows/i.test(navigator.platform);
+
+  var opera_version = opera && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
+  if (opera_version) opera_version = Number(opera_version[1]);
+  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
+  var flipCtrlCmd = mac && (qtwebkit || opera && (opera_version == null || opera_version < 12.11));
+  var captureMiddleClick = gecko || (ie && !ie_lt9);
+
+  // Optimize some code when these features are not used
+  var sawReadOnlySpans = false, sawCollapsedSpans = false;
+
+  // CONSTRUCTOR
+
+  function CodeMirror(place, options) {
+    if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
+
+    this.options = options = options || {};
     // Determine effective options based on given values and defaults.
-    var options = {}, defaults = CodeMirror.defaults;
-    for (var opt in defaults)
-      if (defaults.hasOwnProperty(opt))
-        options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
-
-    var input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em");
-    input.setAttribute("wrap", "off"); input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");
+    for (var opt in defaults) if (!options.hasOwnProperty(opt) && defaults.hasOwnProperty(opt))
+      options[opt] = defaults[opt];
+    setGuttersForLineNumbers(options);
+
+    var docStart = typeof options.value == "string" ? 0 : options.value.first;
+    var display = this.display = makeDisplay(place, docStart);
+    display.wrapper.CodeMirror = this;
+    updateGutters(this);
+    if (options.autofocus && !mobile) focusInput(this);
+
+    this.state = {keyMaps: [],
+                  overlays: [],
+                  modeGen: 0,
+                  overwrite: false, focused: false,
+                  suppressEdits: false, pasteIncoming: false,
+                  draggingText: false,
+                  highlight: new Delayed()};
+
+    themeChanged(this);
+    if (options.lineWrapping)
+      this.display.wrapper.className += " CodeMirror-wrap";
+
+    var doc = options.value;
+    if (typeof doc == "string") doc = new Doc(options.value, options.mode);
+    operation(this, attachDoc)(this, doc);
+
+    // Override magic textarea content restore that IE sometimes does
+    // on our hidden textarea on reload
+    if (ie) setTimeout(bind(resetInput, this, true), 20);
+
+    registerEventHandlers(this);
+    // IE throws unspecified error in certain cases, when
+    // trying to access activeElement before onload
+    var hasFocus; try { hasFocus = (document.activeElement == display.input); } catch(e) { }
+    if (hasFocus || (options.autofocus && !mobile)) setTimeout(bind(onFocus, this), 20);
+    else onBlur(this);
+
+    operation(this, function() {
+      for (var opt in optionHandlers)
+        if (optionHandlers.propertyIsEnumerable(opt))
+          optionHandlers[opt](this, options[opt], Init);
+      for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
+    })();
+  }
+
+  // DISPLAY CONSTRUCTOR
+
+  function makeDisplay(place, docStart) {
+    var d = {};
+
+    var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none; font-size: 4px;");
+    if (webkit) input.style.width = "1000px";
+    else input.setAttribute("wrap", "off");
+    // if border: 0; -- iOS fails to open keyboard (issue #1287)
+    if (ios) input.style.border = "1px solid black";
+    input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");
+
     // Wraps and hides input textarea
-    var inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
-    // The empty scrollbar content, used solely for managing the scrollbar thumb.
-    var scrollbarInner = elt("div", null, "CodeMirror-scrollbar-inner");
-    // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.
-    var scrollbar = elt("div", [scrollbarInner], "CodeMirror-scrollbar");
+    d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The actual fake scrollbars.
+    d.scrollbarH = elt("div", [elt("div", null, null, "height: 1px")], "CodeMirror-hscrollbar");
+    d.scrollbarV = elt("div", [elt("div", null, null, "width: 1px")], "CodeMirror-vscrollbar");
+    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
     // DIVs containing the selection and the actual code
-    var lineDiv = elt("div"), selectionDiv = elt("div", null, null, "position: relative; z-index: -1");
+    d.lineDiv = elt("div");
+    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
     // Blinky cursor, and element used to ensure cursor fits at the end of a line
-    var cursor = elt("pre", "\u00a0", "CodeMirror-cursor"), widthForcer = elt("pre", "\u00a0", "CodeMirror-cursor", "visibility: hidden");
+    d.cursor = elt("div", "\u00a0", "CodeMirror-cursor");
+    // Secondary cursor, shown when on a 'jump' in bi-directional text
+    d.otherCursor = elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor");
     // Used to measure text size
-    var measure = elt("div", null, null, "position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden;");
-    var lineSpace = elt("div", [measure, cursor, widthForcer, selectionDiv, lineDiv], null, "position: relative; z-index: 0");
-    var gutterText = elt("div", null, "CodeMirror-gutter-text"), gutter = elt("div", [gutterText], "CodeMirror-gutter");
+    d.measure = elt("div", null, "CodeMirror-measure");
+    // Wraps everything that needs to exist inside the vertically-padded coordinate system
+    d.lineSpace = elt("div", [d.measure, d.selectionDiv, d.lineDiv, d.cursor, d.otherCursor],
+                         null, "position: relative; outline: none");
     // Moved around its parent to cover visible view
-    var mover = elt("div", [gutter, elt("div", [lineSpace], "CodeMirror-lines")], null, "position: relative");
+    d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
     // Set to the height of the text, causes scrolling
-    var sizer = elt("div", [mover], null, "position: relative");
+    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
+    // D is needed because behavior of elts with overflow: auto and padding is inconsistent across browsers
+    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerCutOff + "px; width: 1px;");
+    // Will contain the gutters, if any
+    d.gutters = elt("div", null, "CodeMirror-gutters");
+    d.lineGutter = null;
+    // Helper element to properly size the gutter backgrounds
+    var scrollerInner = elt("div", [d.sizer, d.heightForcer, d.gutters], null, "position: relative; min-height: 100%");
     // Provides scrolling
-    var scroller = elt("div", [sizer], "CodeMirror-scroll");
-    scroller.setAttribute("tabIndex", "-1");
+    d.scroller = elt("div", [scrollerInner], "CodeMirror-scroll");
+    d.scroller.setAttribute("tabIndex", "-1");
     // The element in which the editor lives.
-    var wrapper = elt("div", [inputDiv, scrollbar, scroller], "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""));
-    if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
-
-    themeChanged(); keyMapChanged();
+    d.wrapper = elt("div", [d.inputDiv, d.scrollbarH, d.scrollbarV,
+                            d.scrollbarFiller, d.scroller], "CodeMirror");
+    // Work around IE7 z-index bug
+    if (ie_lt8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
+    if (place.appendChild) place.appendChild(d.wrapper); else place(d.wrapper);
+
     // Needed to hide big blue blinking cursor on Mobile Safari
     if (ios) input.style.width = "0px";
-    if (!webkit) scroller.draggable = true;
-    lineSpace.style.outline = "none";
-    if (options.tabindex != null) input.tabIndex = options.tabindex;
-    if (options.autofocus) focusInput();
-    if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
+    if (!webkit) d.scroller.draggable = true;
     // Needed to handle Tab key in KHTML
-    if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";
-
-    // Check for OS X >= 10.7. This has transparent scrollbars, so the
-    // overlaying of one scrollbar with another won't work. This is a
-    // temporary hack to simply turn off the overlay scrollbar. See
-    // issue #727.
-    if (mac_geLion) { scrollbar.style.zIndex = -2; scrollbar.style.visibility = "hidden"; }
+    if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
     // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
-    else if (ie_lt8) scrollbar.style.minWidth = "18px";
-
-    // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
-    var poll = new Delayed(), highlight = new Delayed(), blinker;
-
-    // mode holds a mode API object. doc is the tree of Line objects,
-    // frontier is the point up to which the content has been parsed,
-    // and history the undo history (instance of History constructor).
-    var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), frontier = 0, focused;
-    loadMode();
-    // The selection. These are always maintained to point at valid
-    // positions. Inverted is used to remember that the user is
-    // selecting bottom-to-top.
-    var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
-    // Selection-related flags. shiftSelecting obviously tracks
-    // whether the user is holding shift.
-    var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, draggingText,
-        overwrite = false, suppressEdits = false, pasteIncoming = false;
-    // Variables used by startOperation/endOperation to track what
-    // happened during the operation.
-    var updateInput, userSelChange, changes, textChanged, selectionChanged,
-        gutterDirty, callbacks;
+    else if (ie_lt8) d.scrollbarH.style.minWidth = d.scrollbarV.style.minWidth = "18px";
+
     // Current visible range (may be bigger than the view window).
-    var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
-    // bracketHighlighted is used to remember that a bracket has been
-    // marked.
-    var bracketHighlighted;
+    d.viewOffset = d.lastSizeC = 0;
+    d.showingFrom = d.showingTo = docStart;
+
+    // Used to only resize the line number gutter when necessary (when
+    // the amount of lines crosses a boundary that makes its width change)
+    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
+    // See readInput and resetInput
+    d.prevInput = "";
+    // Set to true when a non-horizontal-scrolling widget is added. As
+    // an optimization, widget aligning is skipped when d is false.
+    d.alignWidgets = false;
+    // Flag that indicates whether we currently expect input to appear
+    // (after some event like 'keypress' or 'input') and are polling
+    // intensively.
+    d.pollingFast = false;
+    // Self-resetting timeout for the poller
+    d.poll = new Delayed();
+
+    d.cachedCharWidth = d.cachedTextHeight = null;
+    d.measureLineCache = [];
+    d.measureLineCachePos = 0;
+
+    // Tracks when resetInput has punted to just putting a short
+    // string instead of the (large) selection.
+    d.inaccurateSelection = false;
+
     // Tracks the maximum line length so that the horizontal scrollbar
     // can be kept static when scrolling.
-    var maxLine = getLine(0), updateMaxLine = false, maxLineChanged = true;
-    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
-    var goalColumn = null;
-
-    // Initialize the content.
-    operation(function(){setValue(options.value || ""); updateInput = false;})();
-    var history = new History();
-
-    // Register our event handlers.
-    connect(scroller, "mousedown", operation(onMouseDown));
-    connect(scroller, "dblclick", operation(onDoubleClick));
-    connect(lineSpace, "selectstart", e_preventDefault);
+    d.maxLine = null;
+    d.maxLineLength = 0;
+    d.maxLineChanged = false;
+
+    // Used for measuring wheel scrolling granularity
+    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
+
+    return d;
+  }
+
+  // STATE UPDATES
+
+  // Used to get the editor into a consistent state again when options change.
+
+  function loadMode(cm) {
+    cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
+    cm.doc.iter(function(line) {
+      if (line.stateAfter) line.stateAfter = null;
+      if (line.styles) line.styles = null;
+    });
+    cm.doc.frontier = cm.doc.first;
+    startWorker(cm, 100);
+    cm.state.modeGen++;
+    if (cm.curOp) regChange(cm);
+  }
+
+  function wrappingChanged(cm) {
+    if (cm.options.lineWrapping) {
+      cm.display.wrapper.className += " CodeMirror-wrap";
+      cm.display.sizer.style.minWidth = "";
+    } else {
+      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");
+      computeMaxLength(cm);
+    }
+    estimateLineHeights(cm);
+    regChange(cm);
+    clearCaches(cm);
+    setTimeout(function(){updateScrollbars(cm.display, cm.doc.height);}, 100);
+  }
+
+  function estimateHeight(cm) {
+    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
+    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
+    return function(line) {
+      if (lineIsHidden(cm.doc, line))
+        return 0;
+      else if (wrapping)
+        return (Math.ceil(line.text.length / perLine) || 1) * th;
+      else
+        return th;
+    };
+  }
+
+  function estimateLineHeights(cm) {
+    var doc = cm.doc, est = estimateHeight(cm);
+    doc.iter(function(line) {
+      var estHeight = est(line);
+      if (estHeight != line.height) updateLineHeight(line, estHeight);
+    });
+  }
+
+  function keyMapChanged(cm) {
+    var style = keyMap[cm.options.keyMap].style;
+    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
+      (style ? " cm-keymap-" + style : "");
+  }
+
+  function themeChanged(cm) {
+    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
+      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
+    clearCaches(cm);
+  }
+
+  function guttersChanged(cm) {
+    updateGutters(cm);
+    regChange(cm);
+  }
+
+  function updateGutters(cm) {
+    var gutters = cm.display.gutters, specs = cm.options.gutters;
+    removeChildren(gutters);
+    for (var i = 0; i < specs.length; ++i) {
+      var gutterClass = specs[i];
+      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
+      if (gutterClass == "CodeMirror-linenumbers") {
+        cm.display.lineGutter = gElt;
+        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
+      }
+    }
+    gutters.style.display = i ? "" : "none";
+  }
+
+  function lineLength(doc, line) {
+    if (line.height == 0) return 0;
+    var len = line.text.length, merged, cur = line;
+    while (merged = collapsedSpanAtStart(cur)) {
+      var found = merged.find();
+      cur = getLine(doc, found.from.line);
+      len += found.from.ch - found.to.ch;
+    }
+    cur = line;
+    while (merged = collapsedSpanAtEnd(cur)) {
+      var found = merged.find();
+      len -= cur.text.length - found.from.ch;
+      cur = getLine(doc, found.to.line);
+      len += cur.text.length - found.to.ch;
+    }
+    return len;
+  }
+
+  function computeMaxLength(cm) {
+    var d = cm.display, doc = cm.doc;
+    d.maxLine = getLine(doc, doc.first);
+    d.maxLineLength = lineLength(doc, d.maxLine);
+    d.maxLineChanged = true;
+    doc.iter(function(line) {
+      var len = lineLength(doc, line);
+      if (len > d.maxLineLength) {
+        d.maxLineLength = len;
+        d.maxLine = line;
+      }
+    });
+  }
+
+  // Make sure the gutters options contains the element
+  // "CodeMirror-linenumbers" when the lineNumbers option is true.
+  function setGuttersForLineNumbers(options) {
+    var found = false;
+    for (var i = 0; i < options.gutters.length; ++i) {
+      if (options.gutters[i] == "CodeMirror-linenumbers") {
+        if (options.lineNumbers) found = true;
+        else options.gutters.splice(i--, 1);
+      }
+    }
+    if (!found && options.lineNumbers)
+      options.gutters.push("CodeMirror-linenumbers");
+  }
+
+  // SCROLLBARS
+
+  // Re-synchronize the fake scrollbars with the actual size of the
+  // content. Optionally force a scrollTop.
+  function updateScrollbars(d /* display */, docHeight) {
+    var totalHeight = docHeight + paddingVert(d);
+    d.sizer.style.minHeight = d.heightForcer.style.top = totalHeight + "px";
+    var scrollHeight = Math.max(totalHeight, d.scroller.scrollHeight);
+    var needsH = d.scroller.scrollWidth > d.scroller.clientWidth;
+    var needsV = scrollHeight > d.scroller.clientHeight;
+    if (needsV) {
+      d.scrollbarV.style.display = "block";
+      d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";
+      d.scrollbarV.firstChild.style.height =
+        (scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight) + "px";
+    } else d.scrollbarV.style.display = "";
+    if (needsH) {
+      d.scrollbarH.style.display = "block";
+      d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";
+      d.scrollbarH.firstChild.style.width =
+        (d.scroller.scrollWidth - d.scroller.clientWidth + d.scrollbarH.clientWidth) + "px";
+    } else d.scrollbarH.style.display = "";
+    if (needsH && needsV) {
+      d.scrollbarFiller.style.display = "block";
+      d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";
+    } else d.scrollbarFiller.style.display = "";
+
+    if (mac_geLion && scrollbarWidth(d.measure) === 0)
+      d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = mac_geMountainLion ? "18px" : "12px";
+  }
+
+  function visibleLines(display, doc, viewPort) {
+    var top = display.scroller.scrollTop, height = display.wrapper.clientHeight;
+    if (typeof viewPort == "number") top = viewPort;
+    else if (viewPort) {top = viewPort.top; height = viewPort.bottom - viewPort.top;}
+    top = Math.floor(top - paddingTop(display));
+    var bottom = Math.ceil(top + height);
+    return {from: lineAtHeight(doc, top), to: lineAtHeight(doc, bottom)};
+  }
+
+  // LINE NUMBERS
+
+  function alignHorizontally(cm) {
+    var display = cm.display;
+    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
+    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
+    var gutterW = display.gutters.offsetWidth, l = comp + "px";
+    for (var n = display.lineDiv.firstChild; n; n = n.nextSibling) if (n.alignable) {
+      for (var i = 0, a = n.alignable; i < a.length; ++i) a[i].style.left = l;
+    }
+    if (cm.options.fixedGutter)
+      display.gutters.style.left = (comp + gutterW) + "px";
+  }
+
+  function maybeUpdateLineNumberWidth(cm) {
+    if (!cm.options.lineNumbers) return false;
+    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
+    if (last.length != display.lineNumChars) {
+      var test = display.measure.appendChild(elt("div", [elt("div", last)],
+                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
+      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
+      display.lineGutter.style.width = "";
+      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
+      display.lineNumWidth = display.lineNumInnerWidth + padding;
+      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
+      display.lineGutter.style.width = display.lineNumWidth + "px";
+      return true;
+    }
+    return false;
+  }
+
+  function lineNumberFor(options, i) {
+    return String(options.lineNumberFormatter(i + options.firstLineNumber));
+  }
+  function compensateForHScroll(display) {
+    return getRect(display.scroller).left - getRect(display.sizer).left;
+  }
+
+  // DISPLAY DRAWING
+
+  function updateDisplay(cm, changes, viewPort) {
+    var oldFrom = cm.display.showingFrom, oldTo = cm.display.showingTo, updated;
+    var visible = visibleLines(cm.display, cm.doc, viewPort);
+    for (;;) {
+      if (updateDisplayInner(cm, changes, visible)) {
+        updated = true;
+        signalLater(cm, "update", cm);
+        if (cm.display.showingFrom != oldFrom || cm.display.showingTo != oldTo)
+          signalLater(cm, "viewportChange", cm, cm.display.showingFrom, cm.display.showingTo);
+      } else break;
+      updateSelection(cm);
+      updateScrollbars(cm.display, cm.doc.height);
+
+      // Clip forced viewport to actual scrollable area
+      if (viewPort)
+        viewPort = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight,
+                            typeof viewPort == "number" ? viewPort : viewPort.top);
+      visible = visibleLines(cm.display, cm.doc, viewPort);
+      if (visible.from >= cm.display.showingFrom && visible.to <= cm.display.showingTo)
+        break;
+      changes = [];
+    }
+
+    return updated;
+  }
+
+  // Uses a set of changes plus the current scroll position to
+  // determine which DOM updates have to be made, and makes the
+  // updates.
+  function updateDisplayInner(cm, changes, visible) {
+    var display = cm.display, doc = cm.doc;
+    if (!display.wrapper.clientWidth) {
+      display.showingFrom = display.showingTo = doc.first;
+      display.viewOffset = 0;
+      return;
+    }
+
+    // Bail out if the visible area is already rendered and nothing changed.
+    if (changes.length == 0 &&
+        visible.from > display.showingFrom && visible.to < display.showingTo)
+      return;
+
+    if (maybeUpdateLineNumberWidth(cm))
+      changes = [{from: doc.first, to: doc.first + doc.size}];
+    var gutterW = display.sizer.style.marginLeft = display.gutters.offsetWidth + "px";
+    display.scrollbarH.style.left = cm.options.fixedGutter ? gutterW : "0";
+
+    // Used to determine which lines need their line numbers updated
+    var positionsChangedFrom = Infinity;
+    if (cm.options.lineNumbers)
+      for (var i = 0; i < changes.length; ++i)
+        if (changes[i].diff) { positionsChangedFrom = changes[i].from; break; }
+
+    var end = doc.first + doc.size;
+    var from = Math.max(visible.from - cm.options.viewportMargin, doc.first);
+    var to = Math.min(end, visible.to + cm.options.viewportMargin);
+    if (display.showingFrom < from && from - display.showingFrom < 20) from = Math.max(doc.first, display.showingFrom);
+    if (display.showingTo > to && display.showingTo - to < 20) to = Math.min(end, display.showingTo);
+    if (sawCollapsedSpans) {
+      from = lineNo(visualLine(doc, getLine(doc, from)));
+      while (to < end && lineIsHidden(doc, getLine(doc, to))) ++to;
+    }
+
+    // Create a range of theoretically intact lines, and punch holes
+    // in that using the change info.
+    var intact = [{from: Math.max(display.showingFrom, doc.first),
+                   to: Math.min(display.showingTo, end)}];
+    if (intact[0].from >= intact[0].to) intact = [];
+    else intact = computeIntact(intact, changes);
+    // When merged lines are present, we might have to reduce the
+    // intact ranges because changes in continued fragments of the
+    // intact lines do require the lines to be redrawn.
+    if (sawCollapsedSpans)
+      for (var i = 0; i < intact.length; ++i) {
+        var range = intact[i], merged;
+        while (merged = collapsedSpanAtEnd(getLine(doc, range.to - 1))) {
+          var newTo = merged.find().from.line;
+          if (newTo > range.from) range.to = newTo;
+          else { intact.splice(i--, 1); break; }
+        }
+      }
+
+    // Clip off the parts that won't be visible
+    var intactLines = 0;
+    for (var i = 0; i < intact.length; ++i) {
+      var range = intact[i];
+      if (range.from < from) range.from = from;
+      if (range.to > to) range.to = to;
+      if (range.from >= range.to) intact.splice(i--, 1);
+      else intactLines += range.to - range.from;
+    }
+    if (intactLines == to - from && from == display.showingFrom && to == display.showingTo) {
+      updateViewOffset(cm);
+      return;
+    }
+    intact.sort(function(a, b) {return a.from - b.from;});
+
+    // Avoid crashing on IE's "unspecified error" when in iframes
+    try {
+      var focused = document.activeElement;
+    } catch(e) {}
+    if (intactLines < (to - from) * .7) display.lineDiv.style.display = "none";
+    patchDisplay(cm, from, to, intact, positionsChangedFrom);
+    display.lineDiv.style.display = "";
+    if (focused && document.activeElement != focused && focused.offsetHeight) focused.focus();
+
+    var different = from != display.showingFrom || to != display.showingTo ||
+      display.lastSizeC != display.wrapper.clientHeight;
+    // This is just a bogus formula that detects when the editor is
+    // resized or the font size changes.
+    if (different) display.lastSizeC = display.wrapper.clientHeight;
+    display.showingFrom = from; display.showingTo = to;
+    startWorker(cm, 100);
+
+    var prevBottom = display.lineDiv.offsetTop;
+    for (var node = display.lineDiv.firstChild, height; node; node = node.nextSibling) if (node.lineObj) {
+      if (ie_lt8) {
+        var bot = node.offsetTop + node.offsetHeight;
+        height = bot - prevBottom;
+        prevBottom = bot;
+      } else {
+        var box = getRect(node);
+        height = box.bottom - box.top;
+      }
+      var diff = node.lineObj.height - height;
+      if (height < 2) height = textHeight(display);
+      if (diff > .001 || diff < -.001) {
+        updateLineHeight(node.lineObj, height);
+        var widgets = node.lineObj.widgets;
+        if (widgets) for (var i = 0; i < widgets.length; ++i)
+          widgets[i].height = widgets[i].node.offsetHeight;
+      }
+    }
+    updateViewOffset(cm);
+
+    return true;
+  }
+
+  function updateViewOffset(cm) {
+    var off = cm.display.viewOffset = heightAtLine(cm, getLine(cm.doc, cm.display.showingFrom));
+    // Position the mover div to align with the current virtual scroll position
+    cm.display.mover.style.top = off + "px";
+  }
+
+  function computeIntact(intact, changes) {
+    for (var i = 0, l = changes.length || 0; i < l; ++i) {
+      var change = changes[i], intact2 = [], diff = change.diff || 0;
+      for (var j = 0, l2 = intact.length; j < l2; ++j) {
+        var range = intact[j];
+        if (change.to <= range.from && change.diff) {
+          intact2.push({from: range.from + diff, to: range.to + diff});
+        } else if (change.to <= range.from || change.from >= range.to) {
+          intact2.push(range);
+        } else {
+          if (change.from > range.from)
+            intact2.push({from: range.from, to: change.from});
+          if (change.to < range.to)
+            intact2.push({from: change.to + diff, to: range.to + diff});
+        }
+      }
+      intact = intact2;
+    }
+    return intact;
+  }
+
+  function getDimensions(cm) {
+    var d = cm.display, left = {}, width = {};
+    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
+      left[cm.options.gutters[i]] = n.offsetLeft;
+      width[cm.options.gutters[i]] = n.offsetWidth;
+    }
+    return {fixedPos: compensateForHScroll(d),
+            gutterTotalWidth: d.gutters.offsetWidth,
+            gutterLeft: left,
+            gutterWidth: width,
+            wrapperWidth: d.wrapper.clientWidth};
+  }
+
+  function patchDisplay(cm, from, to, intact, updateNumbersFrom) {
+    var dims = getDimensions(cm);
+    var display = cm.display, lineNumbers = cm.options.lineNumbers;
+    if (!intact.length && (!webkit || !cm.display.currentWheelTarget))
+      removeChildren(display.lineDiv);
+    var container = display.lineDiv, cur = container.firstChild;
+
+    function rm(node) {
+      var next = node.nextSibling;
+      if (webkit && mac && cm.display.currentWheelTarget == node) {
+        node.style.display = "none";
+        node.lineObj = null;
+      } else {
+        node.parentNode.removeChild(node);
+      }
+      return next;
+    }
+
+    var nextIntact = intact.shift(), lineN = from;
+    cm.doc.iter(from, to, function(line) {
+      if (nextIntact && nextIntact.to == lineN) nextIntact = intact.shift();
+      if (lineIsHidden(cm.doc, line)) {
+        if (line.height != 0) updateLineHeight(line, 0);
+        if (line.widgets && cur.previousSibling) for (var i = 0; i < line.widgets.length; ++i)
+          if (line.widgets[i].showIfHidden) {
+            var prev = cur.previousSibling;
+            if (/pre/i.test(prev.nodeName)) {
+              var wrap = elt("div", null, null, "position: relative");
+              prev.parentNode.replaceChild(wrap, prev);
+              wrap.appendChild(prev);
+              prev = wrap;
+            }
+            var wnode = prev.appendChild(elt("div", [line.widgets[i].node], "CodeMirror-linewidget"));
+            positionLineWidget(line.widgets[i], wnode, prev, dims);
+          }
+      } else if (nextIntact && nextIntact.from <= lineN && nextIntact.to > lineN) {
+        // This line is intact. Skip to the actual node. Update its
+        // line number if needed.
+        while (cur.lineObj != line) cur = rm(cur);
+        if (lineNumbers && updateNumbersFrom <= lineN && cur.lineNumber)
+          setTextContent(cur.lineNumber, lineNumberFor(cm.options, lineN));
+        cur = cur.nextSibling;
+      } else {
+        // For lines with widgets, make an attempt to find and reuse
+        // the existing element, so that widgets aren't needlessly
+        // removed and re-inserted into the dom
+        if (line.widgets) for (var j = 0, search = cur, reuse; search && j < 20; ++j, search = search.nextSibling)
+          if (search.lineObj == line && /div/i.test(search.nodeName)) { reuse = search; break; }
+        // This line needs to be generated.
+        var lineNode = buildLineElement(cm, line, lineN, dims, reuse);
+        if (lineNode != reuse) {
+          container.insertBefore(lineNode, cur);
+        } else {
+          while (cur != reuse) cur = rm(cur);
+          cur = cur.nextSibling;
+        }
+
+        lineNode.lineObj = line;
+      }
+      ++lineN;
+    });
+    while (cur) cur = rm(cur);
+  }
+
+  function buildLineElement(cm, line, lineNo, dims, reuse) {
+    var lineElement = lineContent(cm, line);
+    var markers = line.gutterMarkers, display = cm.display, wrap;
+
+    if (!cm.options.lineNumbers && !markers && !line.bgClass && !line.wrapClass && !line.widgets)
+      return lineElement;
+
+    // Lines with gutter elements, widgets or a background class need
+    // to be wrapped again, and have the extra elements added to the
+    // wrapper div
+
+    if (reuse) {
+      reuse.alignable = null;
+      var isOk = true, widgetsSeen = 0;
+      for (var n = reuse.firstChild, next; n; n = next) {
+        next = n.nextSibling;
+        if (!/\bCodeMirror-linewidget\b/.test(n.className)) {
+          reuse.removeChild(n);
+        } else {
+          for (var i = 0, first = true; i < line.widgets.length; ++i) {
+            var widget = line.widgets[i], isFirst = false;
+            if (!widget.above) { isFirst = first; first = false; }
+            if (widget.node == n.firstChild) {
+              positionLineWidget(widget, n, reuse, dims);
+              ++widgetsSeen;
+              if (isFirst) reuse.insertBefore(lineElement, n);
+              break;
+            }
+          }
+          if (i == line.widgets.length) { isOk = false; break; }
+        }
+      }
+      if (isOk && widgetsSeen == line.widgets.length) {
+        wrap = reuse;
+        reuse.className = line.wrapClass || "";
+      }
+    }
+    if (!wrap) {
+      wrap = elt("div", null, line.wrapClass, "position: relative");
+      wrap.appendChild(lineElement);
+    }
+    // Kludge to make sure the styled element lies behind the selection (by z-index)
+    if (line.bgClass)
+      wrap.insertBefore(elt("div", null, line.bgClass + " CodeMirror-linebackground"), wrap.firstChild);
+    if (cm.options.lineNumbers || markers) {
+      var gutterWrap = wrap.insertBefore(elt("div", null, null, "position: absolute; left: " +
+                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"),
+                                         wrap.firstChild);
+      if (cm.options.fixedGutter) (wrap.alignable || (wrap.alignable = [])).push(gutterWrap);
+      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
+        wrap.lineNumber = gutterWrap.appendChild(
+          elt("div", lineNumberFor(cm.options, lineNo),
+              "CodeMirror-linenumber CodeMirror-gutter-elt",
+              "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
+              + display.lineNumInnerWidth + "px"));
+      if (markers)
+        for (var k = 0; k < cm.options.gutters.length; ++k) {
+          var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
+          if (found)
+            gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
+                                       dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
+        }
+    }
+    if (ie_lt8) wrap.style.zIndex = 2;
+    if (line.widgets && wrap != reuse) for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
+      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
+      positionLineWidget(widget, node, wrap, dims);
+      if (widget.above)
+        wrap.insertBefore(node, cm.options.lineNumbers && line.height != 0 ? gutterWrap : lineElement);
+      else
+        wrap.appendChild(node);
+      signalLater(widget, "redraw");
+    }
+    return wrap;
+  }
+
+  function positionLineWidget(widget, node, wrap, dims) {
+    if (widget.noHScroll) {
+      (wrap.alignable || (wrap.alignable = [])).push(node);
+      var width = dims.wrapperWidth;
+      node.style.left = dims.fixedPos + "px";
+      if (!widget.coverGutter) {
+        width -= dims.gutterTotalWidth;
+        node.style.paddingLeft = dims.gutterTotalWidth + "px";
+      }
+      node.style.width = width + "px";
+    }
+    if (widget.coverGutter) {
+      node.style.zIndex = 5;
+      node.style.position = "relative";
+      if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
+    }
+  }
+
+  // SELECTION / CURSOR
+
+  function updateSelection(cm) {
+    var display = cm.display;
+    var collapsed = posEq(cm.doc.sel.from, cm.doc.sel.to);
+    if (collapsed || cm.options.showCursorWhenSelecting)
+      updateSelectionCursor(cm);
+    else
+      display.cursor.style.display = display.otherCursor.style.display = "none";
+    if (!collapsed)
+      updateSelectionRange(cm);
+    else
+      display.selectionDiv.style.display = "none";
+
+    // Move the hidden textarea near the cursor to prevent scrolling artifacts
+    if (cm.options.moveInputWithCursor) {
+      var headPos = cursorCoords(cm, cm.doc.sel.head, "div");
+      var wrapOff = getRect(display.wrapper), lineOff = getRect(display.lineDiv);
+      display.inputDiv.style.top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
+                                                        headPos.top + lineOff.top - wrapOff.top)) + "px";
+      display.inputDiv.style.left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
+                                                         headPos.left + lineOff.left - wrapOff.left)) + "px";
+    }
+  }
+
+  // No selection, plain cursor
+  function updateSelectionCursor(cm) {
+    var display = cm.display, pos = cursorCoords(cm, cm.doc.sel.head, "div");
+    display.cursor.style.left = pos.left + "px";
+    display.cursor.style.top = pos.top + "px";
+    display.cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
+    display.cursor.style.display = "";
+
+    if (pos.other) {
+      display.otherCursor.style.display = "";
+      display.otherCursor.style.left = pos.other.left + "px";
+      display.otherCursor.style.top = pos.other.top + "px";
+      display.otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
+    } else { display.otherCursor.style.display = "none"; }
+  }
+
+  // Highlight selection
+  function updateSelectionRange(cm) {
+    var display = cm.display, doc = cm.doc, sel = cm.doc.sel;
+    var fragment = document.createDocumentFragment();
+    var clientWidth = display.lineSpace.offsetWidth, pl = paddingLeft(cm.display);
+
+    function add(left, top, width, bottom) {
+      if (top < 0) top = 0;
+      fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
+                               "px; top: " + top + "px; width: " + (width == null ? clientWidth - left : width) +
+                               "px; height: " + (bottom - top) + "px"));
+    }
+
+    function drawForLine(line, fromArg, toArg, retTop) {
+      var lineObj = getLine(doc, line);
+      var lineLen = lineObj.text.length, rVal = retTop ? Infinity : -Infinity;
+      function coords(ch) {
+        return charCoords(cm, Pos(line, ch), "div", lineObj);
+      }
+
+      iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
+        var leftPos = coords(from), rightPos, left, right;
+        if (from == to) {
+          rightPos = leftPos;
+          left = right = leftPos.left;
+        } else {
+          rightPos = coords(to - 1);
+          if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
+          left = leftPos.left;
+          right = rightPos.right;
+        }
+        if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
+          add(left, leftPos.top, null, leftPos.bottom);
+          left = pl;
+          if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
+        }
+        if (toArg == null && to == lineLen) right = clientWidth;
+        if (fromArg == null && from == 0) left = pl;
+        rVal = retTop ? Math.min(rightPos.top, rVal) : Math.max(rightPos.bottom, rVal);
+        if (left < pl + 1) left = pl;
+        add(left, rightPos.top, right - left, rightPos.bottom);
+      });
+      return rVal;
+    }
+
+    if (sel.from.line == sel.to.line) {
+      drawForLine(sel.from.line, sel.from.ch, sel.to.ch);
+    } else {
+      var fromObj = getLine(doc, sel.from.line);
+      var cur = fromObj, merged, path = [sel.from.line, sel.from.ch], singleLine;
+      while (merged = collapsedSpanAtEnd(cur)) {
+        var found = merged.find();
+        path.push(found.from.ch, found.to.line, found.to.ch);
+        if (found.to.line == sel.to.line) {
+          path.push(sel.to.ch);
+          singleLine = true;
+          break;
+        }
+        cur = getLine(doc, found.to.line);
+      }
+
+      // This is a single, merged line
+      if (singleLine) {
+        for (var i = 0; i < path.length; i += 3)
+          drawForLine(path[i], path[i+1], path[i+2]);
+      } else {
+        var middleTop, middleBot, toObj = getLine(doc, sel.to.line);
+        if (sel.from.ch)
+          // Draw the first line of selection.
+          middleTop = drawForLine(sel.from.line, sel.from.ch, null, false);
+        else
+          // Simply include it in the middle block.
+          middleTop = heightAtLine(cm, fromObj) - display.viewOffset;
+
+        if (!sel.to.ch)
+          middleBot = heightAtLine(cm, toObj) - display.viewOffset;
+        else
+          middleBot = drawForLine(sel.to.line, collapsedSpanAtStart(toObj) ? null : 0, sel.to.ch, true);
+
+        if (middleTop < middleBot) add(pl, middleTop, null, middleBot);
+      }
+    }
+
+    removeChildrenAndAdd(display.selectionDiv, fragment);
+    display.selectionDiv.style.display = "";
+  }
+
+  // Cursor-blinking
+  function restartBlink(cm) {
+    if (!cm.state.focused) return;
+    var display = cm.display;
+    clearInterval(display.blinker);
+    var on = true;
+    display.cursor.style.visibility = display.otherCursor.style.visibility = "";
+    display.blinker = setInterval(function() {
+      display.cursor.style.visibility = display.otherCursor.style.visibility = (on = !on) ? "" : "hidden";
+    }, cm.options.cursorBlinkRate);
+  }
+
+  // HIGHLIGHT WORKER
+
+  function startWorker(cm, time) {
+    if (cm.doc.mode.startState && cm.doc.frontier < cm.display.showingTo)
+      cm.state.highlight.set(time, bind(highlightWorker, cm));
+  }
+
+  function highlightWorker(cm) {
+    var doc = cm.doc;
+    if (doc.frontier < doc.first) doc.frontier = doc.first;
+    if (doc.frontier >= cm.display.showingTo) return;
+    var end = +new Date + cm.options.workTime;
+    var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
+    var changed = [], prevChange;
+    doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.showingTo + 500), function(line) {
+      if (doc.frontier >= cm.display.showingFrom) { // Visible
+        var oldStyles = line.styles;
+        line.styles = highlightLine(cm, line, state);
+        var ischange = !oldStyles || oldStyles.length != line.styles.length;
+        for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
+        if (ischange) {
+          if (prevChange && prevChange.end == doc.frontier) prevChange.end++;
+          else changed.push(prevChange = {start: doc.frontier, end: doc.frontier + 1});
+        }
+        line.stateAfter = copyState(doc.mode, state);
+      } else {
+        processLine(cm, line, state);
+        line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
+      }
+      ++doc.frontier;
+      if (+new Date > end) {
+        startWorker(cm, cm.options.workDelay);
+        return true;
+      }
+    });
+    if (changed.length)
+      operation(cm, function() {
+        for (var i = 0; i < changed.length; ++i)
+          regChange(this, changed[i].start, changed[i].end);
+      })();
+  }
+
+  // Finds the line to start with when starting a parse. Tries to
+  // find a line with a stateAfter, so that it can start with a
+  // valid state. If that fails, it returns the line with the
+  // smallest indentation, which tends to need the least context to
+  // parse correctly.
+  function findStartLine(cm, n) {
+    var minindent, minline, doc = cm.doc;
+    for (var search = n, lim = n - 100; search > lim; --search) {
+      if (search <= doc.first) return doc.first;
+      var line = getLine(doc, search - 1);
+      if (line.stateAfter) return search;
+      var indented = countColumn(line.text, null, cm.options.tabSize);
+      if (minline == null || minindent > indented) {
+        minline = search - 1;
+        minindent = indented;
+      }
+    }
+    return minline;
+  }
+
+  function getStateBefore(cm, n) {
+    var doc = cm.doc, display = cm.display;
+      if (!doc.mode.startState) return true;
+    var pos = findStartLine(cm, n), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
+    if (!state) state = startState(doc.mode);
+    else state = copyState(doc.mode, state);
+    doc.iter(pos, n, function(line) {
+      processLine(cm, line, state);
+      var save = pos == n - 1 || pos % 5 == 0 || pos >= display.showingFrom && pos < display.showingTo;
+      line.stateAfter = save ? copyState(doc.mode, state) : null;
+      ++pos;
+    });
+    return state;
+  }
+
+  // POSITION MEASUREMENT
+
+  function paddingTop(display) {return display.lineSpace.offsetTop;}
+  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
+  function paddingLeft(display) {
+    var e = removeChildrenAndAdd(display.measure, elt("pre", null, null, "text-align: left")).appendChild(elt("span", "x"));
+    return e.offsetLeft;
+  }
+
+  function measureChar(cm, line, ch, data) {
+    var dir = -1;
+    data = data || measureLine(cm, line);
+
+    for (var pos = ch;; pos += dir) {
+      var r = data[pos];
+      if (r) break;
+      if (dir < 0 && pos == 0) dir = 1;
+    }
+    return {left: pos < ch ? r.right : r.left,
+            right: pos > ch ? r.left : r.right,
+            top: r.top, bottom: r.bottom};
+  }
+
+  function findCachedMeasurement(cm, line) {
+    var cache = cm.display.measureLineCache;
+    for (var i = 0; i < cache.length; ++i) {
+      var memo = cache[i];
+      if (memo.text == line.text && memo.markedSpans == line.markedSpans &&
+          cm.display.scroller.clientWidth == memo.width &&
+          memo.classes == line.textClass + "|" + line.bgClass + "|" + line.wrapClass)
+        return memo.measure;
+    }
+  }
+
+  function measureLine(cm, line) {
+    // First look in the cache
+    var measure = findCachedMeasurement(cm, line);
+    if (!measure) {
+      // Failing that, recompute and store result in cache
+      measure = measureLineInner(cm, line);
+      var cache = cm.display.measureLineCache;
+      var memo = {text: line.text, width: cm.display.scroller.clientWidth,
+                  markedSpans: line.markedSpans, measure: measure,
+                  classes: line.textClass + "|" + line.bgClass + "|" + line.wrapClass};
+      if (cache.length == 16) cache[++cm.display.measureLineCachePos % 16] = memo;
+      else cache.push(memo);
+    }
+    return measure;
+  }
+
+  function measureLineInner(cm, line) {
+    var display = cm.display, measure = emptyArray(line.text.length);
+    var pre = lineContent(cm, line, measure);
+
+    // IE does not cache element positions of inline elements between
+    // calls to getBoundingClientRect. This makes the loop below,
+    // which gathers the positions of all the characters on the line,
+    // do an amount of layout work quadratic to the number of
+    // characters. When line wrapping is off, we try to improve things
+    // by first subdividing the line into a bunch of inline blocks, so
+    // that IE can reuse most of the layout information from caches
+    // for those blocks. This does interfere with line wrapping, so it
+    // doesn't work when wrapping is on, but in that case the
+    // situation is slightly better, since IE does cache line-wrapping
+    // information and only recomputes per-line.
+    if (ie && !ie_lt8 && !cm.options.lineWrapping && pre.childNodes.length > 100) {
+      var fragment = document.createDocumentFragment();
+      var chunk = 10, n = pre.childNodes.length;
+      for (var i = 0, chunks = Math.ceil(n / chunk); i < chunks; ++i) {
+        var wrap = elt("div", null, null, "display: inline-block");
+        for (var j = 0; j < chunk && n; ++j) {
+          wrap.appendChild(pre.firstChild);
+          --n;
+        }
+        fragment.appendChild(wrap);
+      }
+      pre.appendChild(fragment);
+    }
+
+    removeChildrenAndAdd(display.measure, pre);
+
+    var outer = getRect(display.lineDiv);
+    var vranges = [], data = emptyArray(line.text.length), maxBot = pre.offsetHeight;
+    // Work around an IE7/8 bug where it will sometimes have randomly
+    // replaced our pre with a clone at this point.
+    if (ie_lt9 && display.measure.first != pre)
+      removeChildrenAndAdd(display.measure, pre);
+
+    for (var i = 0, cur; i < measure.length; ++i) if (cur = measure[i]) {
+      var size = getRect(cur);
+      var top = Math.max(0, size.top - outer.top), bot = Math.min(size.bottom - outer.top, maxBot);
+      for (var j = 0; j < vranges.length; j += 2) {
+        var rtop = vranges[j], rbot = vranges[j+1];
+        if (rtop > bot || rbot < top) continue;
+        if (rtop <= top && rbot >= bot ||
+            top <= rtop && bot >= rbot ||
+            Math.min(bot, rbot) - Math.max(top, rtop) >= (bot - top) >> 1) {
+          vranges[j] = Math.min(top, rtop);
+          vranges[j+1] = Math.max(bot, rbot);
+          break;
+        }
+      }
+      if (j == vranges.length) vranges.push(top, bot);
+      var right = size.right;
+      if (cur.measureRight) right = getRect(cur.measureRight).left;
+      data[i] = {left: size.left - outer.left, right: right - outer.left, top: j};
+    }
+    for (var i = 0, cur; i < data.length; ++i) if (cur = data[i]) {
+      var vr = cur.top;
+      cur.top = vranges[vr]; cur.bottom = vranges[vr+1];
+    }
+
+    return data;
+  }
+
+  function measureLineWidth(cm, line) {
+    var hasBadSpan = false;
+    if (line.markedSpans) for (var i = 0; i < line.markedSpans; ++i) {
+      var sp = line.markedSpans[i];
+      if (sp.collapsed && (sp.to == null || sp.to == line.text.length)) hasBadSpan = true;
+    }
+    var cached = !hasBadSpan && findCachedMeasurement(cm, line);
+    if (cached) return measureChar(cm, line, line.text.length, cached).right;
+
+    var pre = lineContent(cm, line);
+    var end = pre.appendChild(zeroWidthElement(cm.display.measure));
+    removeChildrenAndAdd(cm.display.measure, pre);
+    return getRect(end).right - getRect(cm.display.lineDiv).left;
+  }
+
+  function clearCaches(cm) {
+    cm.display.measureLineCache.length = cm.display.measureLineCachePos = 0;
+    cm.display.cachedCharWidth = cm.display.cachedTextHeight = null;
+    if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
+    cm.display.lineNumChars = null;
+  }
+
+  // Context is one of "line", "div" (display.lineDiv), "local"/null (editor), or "page"
+  function intoCoordSystem(cm, lineObj, rect, context) {
+    if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
+      var size = widgetHeight(lineObj.widgets[i]);
+      rect.top += size; rect.bottom += size;
+    }
+    if (context == "line") return rect;
+    if (!context) context = "local";
+    var yOff = heightAtLine(cm, lineObj);
+    if (context != "local") yOff -= cm.display.viewOffset;
+    if (context == "page") {
+      var lOff = getRect(cm.display.lineSpace);
+      yOff += lOff.top + (window.pageYOffset || (document.documentElement || document.body).scrollTop);
+      var xOff = lOff.left + (window.pageXOffset || (document.documentElement || document.body).scrollLeft);
+      rect.left += xOff; rect.right += xOff;
+    }
+    rect.top += yOff; rect.bottom += yOff;
+    return rect;
+  }
+
+  // Context may be "window", "page", "div", or "local"/null
+  // Result is in "div" coords
+  function fromCoordSystem(cm, coords, context) {
+    if (context == "div") return coords;
+    var left = coords.left, top = coords.top;
+    if (context == "page") {
+      left -= window.pageXOffset || (document.documentElement || document.body).scrollLeft;
+      top -= window.pageYOffset || (document.documentElement || document.body).scrollTop;
+    }
+    var lineSpaceBox = getRect(cm.display.lineSpace);
+    left -= lineSpaceBox.left;
+    top -= lineSpaceBox.top;
+    if (context == "local" || !context) {
+      var editorBox = getRect(cm.display.wrapper);
+      left += editorBox.left;
+      top += editorBox.top;
+    }
+    return {left: left, top: top};
+  }
+
+  function charCoords(cm, pos, context, lineObj) {
+    if (!lineObj) lineObj = getLine(cm.doc, pos.line);
+    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch), context);
+  }
+
+  function cursorCoords(cm, pos, context, lineObj, measurement) {
+    lineObj = lineObj || getLine(cm.doc, pos.line);
+    if (!measurement) measurement = measureLine(cm, lineObj);
+    function get(ch, right) {
+      var m = measureChar(cm, lineObj, ch, measurement);
+      if (right) m.left = m.right; else m.right = m.left;
+      return intoCoordSystem(cm, lineObj, m, context);
+    }
+    var order = getOrder(lineObj), ch = pos.ch;
+    if (!order) return get(ch);
+    var main, other, linedir = order[0].level;
+    for (var i = 0; i < order.length; ++i) {
+      var part = order[i], rtl = part.level % 2, nb, here;
+      if (part.from < ch && part.to > ch) return get(ch, rtl);
+      var left = rtl ? part.to : part.from, right = rtl ? part.from : part.to;
+      if (left == ch) {
+        // IE returns bogus offsets and widths for edges where the
+        // direction flips, but only for the side with the lower
+        // level. So we try to use the side with the higher level.
+        if (i && part.level < (nb = order[i-1]).level) here = get(nb.level % 2 ? nb.from : nb.to - 1, true);
+        else here = get(rtl && part.from != part.to ? ch - 1 : ch);
+        if (rtl == linedir) main = here; else other = here;
+      } else if (right == ch) {
+        var nb = i < order.length - 1 && order[i+1];
+        if (!rtl && nb && nb.from == nb.to) continue;
+        if (nb && part.level < nb.level) here = get(nb.level % 2 ? nb.to - 1 : nb.from);
+        else here = get(rtl ? ch : ch - 1, true);
+        if (rtl == linedir) main = here; else other = here;
+      }
+    }
+    if (linedir && !ch) other = get(order[0].to - 1);
+    if (!main) return other;
+    if (other) main.other = other;
+    return main;
+  }
+
+  function PosMaybeOutside(line, ch, outside) {
+    var pos = new Pos(line, ch);
+    if (outside) pos.outside = true;
+    return pos;
+  }
+
+  // Coords must be lineSpace-local
+  function coordsChar(cm, x, y) {
+    var doc = cm.doc;
+    y += cm.display.viewOffset;
+    if (y < 0) return PosMaybeOutside(doc.first, 0, true);
+    var lineNo = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
+    if (lineNo > last)
+      return PosMaybeOutside(doc.first + doc.size - 1, getLine(doc, last).text.length, true);
+    if (x < 0) x = 0;
+
+    for (;;) {
+      var lineObj = getLine(doc, lineNo);
+      var found = coordsCharInner(cm, lineObj, lineNo, x, y);
+      var merged = collapsedSpanAtEnd(lineObj);
+      var mergedPos = merged && merged.find();
+      if (merged && found.ch >= mergedPos.from.ch)
+        lineNo = mergedPos.to.line;
+      else
+        return found;
+    }
+  }
+
+  function coordsCharInner(cm, lineObj, lineNo, x, y) {
+    var innerOff = y - heightAtLine(cm, lineObj);
+    var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
+    var measurement = measureLine(cm, lineObj);
+
+    function getX(ch) {
+      var sp = cursorCoords(cm, Pos(lineNo, ch), "line",
+                            lineObj, measurement);
+      wrongLine = true;
+      if (innerOff > sp.bottom) return sp.left - adjust;
+      else if (innerOff < sp.top) return sp.left + adjust;
+      else wrongLine = false;
+      return sp.left;
+    }
+
+    var bidi = getOrder(lineObj), dist = lineObj.text.length;
+    var from = lineLeft(lineObj), to = lineRight(lineObj);
+    var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
+
+    if (x > toX) return PosMaybeOutside(lineNo, to, toOutside);
+    // Do a binary search between these bounds.
+    for (;;) {
+      if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
+        var after = x - fromX < toX - x, ch = after ? from : to;
+        while (isExtendingChar.test(lineObj.text.charAt(ch))) ++ch;
+        var pos = PosMaybeOutside(lineNo, ch, after ? fromOutside : toOutside);
+        pos.after = after;
+        return pos;
+      }
+      var step = Math.ceil(dist / 2), middle = from + step;
+      if (bidi) {
+        middle = from;
+        for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
+      }
+      var middleX = getX(middle);
+      if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
+      else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
+    }
+  }
+
+  var measureText;
+  function textHeight(display) {
+    if (display.cachedTextHeight != null) return display.cachedTextHeight;
+    if (measureText == null) {
+      measureText = elt("pre");
+      // Measure a bunch of lines, for browsers that compute
+      // fractional heights.
+      for (var i = 0; i < 49; ++i) {
+        measureText.appendChild(document.createTextNode("x"));
+        measureText.appendChild(elt("br"));
+      }
+      measureText.appendChild(document.createTextNode("x"));
+    }
+    removeChildrenAndAdd(display.measure, measureText);
+    var height = measureText.offsetHeight / 50;
+    if (height > 3) display.cachedTextHeight = height;
+    removeChildren(display.measure);
+    return height || 1;
+  }
+
+  function charWidth(display) {
+    if (display.cachedCharWidth != null) return display.cachedCharWidth;
+    var anchor = elt("span", "x");
+    var pre = elt("pre", [anchor]);
+    removeChildrenAndAdd(display.measure, pre);
+    var width = anchor.offsetWidth;
+    if (width > 2) display.cachedCharWidth = width;
+    return width || 10;
+  }
+
+  // OPERATIONS
+
+  // Operations are used to wrap changes in such a way that each
+  // change won't have to update the cursor and display (which would
+  // be awkward, slow, and error-prone), but instead updates are
+  // batched and then all combined and executed at once.
+
+  var nextOpId = 0;
+  function startOperation(cm) {
+    cm.curOp = {
+      // An array of ranges of lines that have to be updated. See
+      // updateDisplay.
+      changes: [],
+      updateInput: null,
+      userSelChange: null,
+      textChanged: null,
+      selectionChanged: false,
+      cursorActivity: false,
+      updateMaxLine: false,
+      updateScrollPos: false,
+      id: ++nextOpId
+    };
+    if (!delayedCallbackDepth++) delayedCallbacks = [];
+  }
+
+  function endOperation(cm) {
+    var op = cm.curOp, doc = cm.doc, display = cm.display;
+    cm.curOp = null;
+
+    if (op.updateMaxLine) computeMaxLength(cm);
+    if (display.maxLineChanged && !cm.options.lineWrapping && display.maxLine) {
+      var width = measureLineWidth(cm, display.maxLine);
+      display.sizer.style.minWidth = Math.max(0, width + 3 + scrollerCutOff) + "px";
+      display.maxLineChanged = false;
+      var maxScrollLeft = Math.max(0, display.sizer.offsetLeft + display.sizer.offsetWidth - display.scroller.clientWidth);
+      if (maxScrollLeft < doc.scrollLeft && !op.updateScrollPos)
+        setScrollLeft(cm, Math.min(display.scroller.scrollLeft, maxScrollLeft), true);
+    }
+    var newScrollPos, updated;
+    if (op.updateScrollPos) {
+      newScrollPos = op.updateScrollPos;
+    } else if (op.selectionChanged && display.scroller.clientHeight) { // don't rescroll if not visible
+      var coords = cursorCoords(cm, doc.sel.head);
+      newScrollPos = calculateScrollPos(cm, coords.left, coords.top, coords.left, coords.bottom);
+    }
+    if (op.changes.length || newScrollPos && newScrollPos.scrollTop != null) {
+      updated = updateDisplay(cm, op.changes, newScrollPos && newScrollPos.scrollTop);
+      if (cm.display.scroller.offsetHeight) cm.doc.scrollTop = cm.display.scroller.scrollTop;
+    }
+    if (!updated && op.selectionChanged) updateSelection(cm);
+    if (op.updateScrollPos) {
+      display.scroller.scrollTop = display.scrollbarV.scrollTop = doc.scrollTop = newScrollPos.scrollTop;
+      display.scroller.scrollLeft = display.scrollbarH.scrollLeft = doc.scrollLeft = newScrollPos.scrollLeft;
+      alignHorizontally(cm);
+      if (op.scrollToPos)
+        scrollPosIntoView(cm, clipPos(cm.doc, op.scrollToPos), op.scrollToPosMargin);
+    } else if (newScrollPos) {
+      scrollCursorIntoView(cm);
+    }
+    if (op.selectionChanged) restartBlink(cm);
+
+    if (cm.state.focused && op.updateInput)
+      resetInput(cm, op.userSelChange);
+
+    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
+    if (hidden) for (var i = 0; i < hidden.length; ++i)
+      if (!hidden[i].lines.length) signal(hidden[i], "hide");
+    if (unhidden) for (var i = 0; i < unhidden.length; ++i)
+      if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
+
+    var delayed;
+    if (!--delayedCallbackDepth) {
+      delayed = delayedCallbacks;
+      delayedCallbacks = null;
+    }
+    if (op.textChanged)
+      signal(cm, "change", cm, op.textChanged);
+    if (op.cursorActivity) signal(cm, "cursorActivity", cm);
+    if (delayed) for (var i = 0; i < delayed.length; ++i) delayed[i]();
+  }
+
+  // Wraps a function in an operation. Returns the wrapped function.
+  function operation(cm1, f) {
+    return function() {
+      var cm = cm1 || this, withOp = !cm.curOp;
+      if (withOp) startOperation(cm);
+      try { var result = f.apply(cm, arguments); }
+      finally { if (withOp) endOperation(cm); }
+      return result;
+    };
+  }
+  function docOperation(f) {
+    return function() {
+      var withOp = this.cm && !this.cm.curOp, result;
+      if (withOp) startOperation(this.cm);
+      try { result = f.apply(this, arguments); }
+      finally { if (withOp) endOperation(this.cm); }
+      return result;
+    };
+  }
+  function runInOp(cm, f) {
+    var withOp = !cm.curOp, result;
+    if (withOp) startOperation(cm);
+    try { result = f(); }
+    finally { if (withOp) endOperation(cm); }
+    return result;
+  }
+
+  function regChange(cm, from, to, lendiff) {
+    if (from == null) from = cm.doc.first;
+    if (to == null) to = cm.doc.first + cm.doc.size;
+    cm.curOp.changes.push({from: from, to: to, diff: lendiff});
+  }
+
+  // INPUT HANDLING
+
+  function slowPoll(cm) {
+    if (cm.display.pollingFast) return;
+    cm.display.poll.set(cm.options.pollInterval, function() {
+      readInput(cm);
+      if (cm.state.focused) slowPoll(cm);
+    });
+  }
+
+  function fastPoll(cm) {
+    var missed = false;
+    cm.display.pollingFast = true;
+    function p() {
+      var changed = readInput(cm);
+      if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
+      else {cm.display.pollingFast = false; slowPoll(cm);}
+    }
+    cm.display.poll.set(20, p);
+  }
+
+  // prevInput is a hack to work with IME. If we reset the textarea
+  // on every change, that breaks IME. So we look for changes
+  // compared to the previous content instead. (Modern browsers have
+  // events that indicate IME taking place, but these are not widely
+  // supported or compatible enough yet to rely on.)
+  function readInput(cm) {
+    var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc, sel = doc.sel;
+    if (!cm.state.focused || hasSelection(input) || isReadOnly(cm)) return false;
+    var text = input.value;
+    if (text == prevInput && posEq(sel.from, sel.to)) return false;
+    if (ie && !ie_lt9 && cm.display.inputHasSelection === text) {
+      resetInput(cm, true);
+      return false;
+    }
+
+    var withOp = !cm.curOp;
+    if (withOp) startOperation(cm);
+    sel.shift = false;
+    var same = 0, l = Math.min(prevInput.length, text.length);
+    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
+    var from = sel.from, to = sel.to;
+    if (same < prevInput.length)
+      from = Pos(from.line, from.ch - (prevInput.length - same));
+    else if (cm.state.overwrite && posEq(from, to) && !cm.state.pasteIncoming)
+      to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + (text.length - same)));
+    var updateInput = cm.curOp.updateInput;
+    makeChange(cm.doc, {from: from, to: to, text: splitLines(text.slice(same)),
+                        origin: cm.state.pasteIncoming ? "paste" : "+input"}, "end");
+
+    cm.curOp.updateInput = updateInput;
+    if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";
+    else cm.display.prevInput = text;
+    if (withOp) endOperation(cm);
+    cm.state.pasteIncoming = false;
+    return true;
+  }
+
+  function resetInput(cm, user) {
+    var minimal, selected, doc = cm.doc;
+    if (!posEq(doc.sel.from, doc.sel.to)) {
+      cm.display.prevInput = "";
+      minimal = hasCopyEvent &&
+        (doc.sel.to.line - doc.sel.from.line > 100 || (selected = cm.getSelection()).length > 1000);
+      var content = minimal ? "-" : selected || cm.getSelection();
+      cm.display.input.value = content;
+      if (cm.state.focused) selectInput(cm.display.input);
+      if (ie && !ie_lt9) cm.display.inputHasSelection = content;
+    } else if (user) {
+      cm.display.prevInput = cm.display.input.value = "";
+      if (ie && !ie_lt9) cm.display.inputHasSelection = null;
+    }
+    cm.display.inaccurateSelection = minimal;
+  }
+
+  function focusInput(cm) {
+    if (cm.options.readOnly != "nocursor" && (!mobile || document.activeElement != cm.display.input))
+      cm.display.input.focus();
+  }
+
+  function isReadOnly(cm) {
+    return cm.options.readOnly || cm.doc.cantEdit;
+  }
+
+  // EVENT HANDLERS
+
+  function registerEventHandlers(cm) {
+    var d = cm.display;
+    on(d.scroller, "mousedown", operation(cm, onMouseDown));
+    if (ie)
+      on(d.scroller, "dblclick", operation(cm, function(e) {
+        var pos = posFromMouse(cm, e);
+        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
+        e_preventDefault(e);
+        var word = findWordAt(getLine(cm.doc, pos.line).text, pos);
+        extendSelection(cm.doc, word.from, word.to);
+      }));
+    else
+      on(d.scroller, "dblclick", e_preventDefault);
+    on(d.lineSpace, "selectstart", function(e) {
+      if (!eventInWidget(d, e)) e_preventDefault(e);
+    });
     // Gecko browsers fire contextmenu *after* opening the menu, at
     // which point we can't mess with it anymore. Context menu is
     // handled in onMouseDown for Gecko.
-    if (!gecko) connect(scroller, "contextmenu", onContextMenu);
-    connect(scroller, "scroll", onScrollMain);
-    connect(scrollbar, "scroll", onScrollBar);
-    connect(scrollbar, "mousedown", function() {if (focused) setTimeout(focusInput, 0);});
-    var resizeHandler = connect(window, "resize", function() {
-      if (wrapper.parentNode) updateDisplay(true);
-      else resizeHandler();
-    }, true);
-    connect(input, "keyup", operation(onKeyUp));
-    connect(input, "input", fastPoll);
-    connect(input, "keydown", operation(onKeyDown));
-    connect(input, "keypress", operation(onKeyPress));
-    connect(input, "focus", onFocus);
-    connect(input, "blur", onBlur);
+    if (!captureMiddleClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
+
+    on(d.scroller, "scroll", function() {
+      if (d.scroller.clientHeight) {
+        setScrollTop(cm, d.scroller.scrollTop);
+        setScrollLeft(cm, d.scroller.scrollLeft, true);
+        signal(cm, "scroll", cm);
+      }
+    });
+    on(d.scrollbarV, "scroll", function() {
+      if (d.scroller.clientHeight) setScrollTop(cm, d.scrollbarV.scrollTop);
+    });
+    on(d.scrollbarH, "scroll", function() {
+      if (d.scroller.clientHeight) setScrollLeft(cm, d.scrollbarH.scrollLeft);
+    });
+
+    on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
+    on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
+
+    function reFocus() { if (cm.state.focused) setTimeout(bind(focusInput, cm), 0); }
+    on(d.scrollbarH, "mousedown", reFocus);
+    on(d.scrollbarV, "mousedown", reFocus);
+    // Prevent wrapper from ever scrolling
+    on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
+
+    function onResize() {
+      // Might be a text scaling operation, clear size caches.
+      d.cachedCharWidth = d.cachedTextHeight = null;
+      clearCaches(cm);
+      runInOp(cm, bind(regChange, cm));
+    }
+    on(window, "resize", onResize);
+    // Above handler holds on to the editor and its data structures.
+    // Here we poll to unregister it when the editor is no longer in
+    // the document, so that it can be garbage-collected.
+    function unregister() {
+      for (var p = d.wrapper.parentNode; p && p != document.body; p = p.parentNode) {}
+      if (p) setTimeout(unregister, 5000);
+      else off(window, "resize", onResize);
+    }
+    setTimeout(unregister, 5000);
+
+    on(d.input, "keyup", operation(cm, function(e) {
+      if (cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
+      if (e.keyCode == 16) cm.doc.sel.shift = false;
+    }));
+    on(d.input, "input", bind(fastPoll, cm));
+    on(d.input, "keydown", operation(cm, onKeyDown));
+    on(d.input, "keypress", operation(cm, onKeyPress));
+    on(d.input, "focus", bind(onFocus, cm));
+    on(d.input, "blur", bind(onBlur, cm));
 
     function drag_(e) {
-      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
+      if (cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))) return;
       e_stop(e);
     }
-    if (options.dragDrop) {
-      connect(scroller, "dragstart", onDragStart);
-      connect(scroller, "dragenter", drag_);
-      connect(scroller, "dragover", drag_);
-      connect(scroller, "drop", operation(onDrop));
-    }
-    connect(scroller, "paste", function(){focusInput(); fastPoll();});
-    connect(input, "paste", function(){pasteIncoming = true; fastPoll();});
-    connect(input, "cut", operation(function(){
-      if (!options.readOnly) replaceSelection("");
-    }));
+    if (cm.options.dragDrop) {
+      on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});
+      on(d.scroller, "dragenter", drag_);
+      on(d.scroller, "dragover", drag_);
+      on(d.scroller, "drop", operation(cm, onDrop));
+    }
+    on(d.scroller, "paste", function(e){
+      if (eventInWidget(d, e)) return;
+      focusInput(cm);
+      fastPoll(cm);
+    });
+    on(d.input, "paste", function() {
+      cm.state.pasteIncoming = true;
+      fastPoll(cm);
+    });
+
+    function prepareCopy() {
+      if (d.inaccurateSelection) {
+        d.prevInput = "";
+        d.inaccurateSelection = false;
+        d.input.value = cm.getSelection();
+        selectInput(d.input);
+      }
+    }
+    on(d.input, "cut", prepareCopy);
+    on(d.input, "copy", prepareCopy);
 
     // Needed to handle Tab key in KHTML
-    if (khtml) connect(sizer, "mouseup", function() {
-        if (document.activeElement == input) input.blur();
-        focusInput();
+    if (khtml) on(d.sizer, "mouseup", function() {
+        if (document.activeElement == d.input) d.input.blur();
+        focusInput(cm);
     });
-
-    // IE throws unspecified error in certain cases, when
-    // trying to access activeElement before onload
-    var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { }
-    if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
-    else onBlur();
-
-    function isLine(l) {return l >= 0 && l < doc.size;}
-    // The instance object that we'll return. Mostly calls out to
-    // local functions in the CodeMirror function. Some do some extra
-    // range checking and/or clipping. operation is used to wrap the
-    // call so that changes it makes are tracked, and the display is
-    // updated afterwards.
-    var instance = wrapper.CodeMirror = {
-      getValue: getValue,
-      setValue: operation(setValue),
-      getSelection: getSelection,
-      replaceSelection: operation(replaceSelection),
-      focus: function(){window.focus(); focusInput(); onFocus(); fastPoll();},
-      setOption: function(option, value) {
-        var oldVal = options[option];
-        options[option] = value;
-        if (option == "mode" || option == "indentUnit") loadMode();
-        else if (option == "readOnly" && value == "nocursor") {onBlur(); input.blur();}
-        else if (option == "readOnly" && !value) {resetInput(true);}
-        else if (option == "theme") themeChanged();
-        else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
-        else if (option == "tabSize") updateDisplay(true);
-        else if (option == "keyMap") keyMapChanged();
-        else if (option == "tabindex") input.tabIndex = value;
-        if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" ||
-            option == "theme" || option == "lineNumberFormatter") {
-          gutterChanged();
-          updateDisplay(true);
-        }
-      },
-      getOption: function(option) {return options[option];},
-      getMode: function() {return mode;},
-      undo: operation(undo),
-      redo: operation(redo),
-      indentLine: operation(function(n, dir) {
-        if (typeof dir != "string") {
-          if (dir == null) dir = options.smartIndent ? "smart" : "prev";
-          else dir = dir ? "add" : "subtract";
-        }
-        if (isLine(n)) indentLine(n, dir);
-      }),
-      indentSelection: operation(indentSelected),
-      historySize: function() {return {undo: history.done.length, redo: history.undone.length};},
-      clearHistory: function() {history = new History();},
-      setHistory: function(histData) {
-        history = new History();
-        history.done = histData.done;
-        history.undone = histData.undone;
-      },
-      getHistory: function() {
-        function cp(arr) {
-          for (var i = 0, nw = [], nwelt; i < arr.length; ++i) {
-            nw.push(nwelt = []);
-            for (var j = 0, elt = arr[i]; j < elt.length; ++j) {
-              var old = [], cur = elt[j];
-              nwelt.push({start: cur.start, added: cur.added, old: old});
-              for (var k = 0; k < cur.old.length; ++k) old.push(hlText(cur.old[k]));
-            }
-          }
-          return nw;
-        }
-        return {done: cp(history.done), undone: cp(history.undone)};
-      },
-      matchBrackets: operation(function(){matchBrackets(true);}),
-      getTokenAt: operation(function(pos) {
-        pos = clipPos(pos);
-        return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), options.tabSize, pos.ch);
-      }),
-      getStateAfter: function(line) {
-        line = clipLine(line == null ? doc.size - 1: line);
-        return getStateBefore(line + 1);
-      },
-      cursorCoords: function(start, mode) {
-        if (start == null) start = sel.inverted;
-        return this.charCoords(start ? sel.from : sel.to, mode);
-      },
-      charCoords: function(pos, mode) {
-        pos = clipPos(pos);
-        if (mode == "local") return localCoords(pos, false);
-        if (mode == "div") return localCoords(pos, true);
-        return pageCoords(pos);
-      },
-      coordsChar: function(coords) {
-        var off = eltOffset(lineSpace);
-        return coordsChar(coords.x - off.left, coords.y - off.top);
-      },
-      defaultTextHeight: function() { return textHeight(); },
-      markText: operation(markText),
-      setBookmark: setBookmark,
-      findMarksAt: findMarksAt,
-      setMarker: operation(addGutterMarker),
-      clearMarker: operation(removeGutterMarker),
-      setLineClass: operation(setLineClass),
-      hideLine: operation(function(h) {return setLineHidden(h, true);}),
-      showLine: operation(function(h) {return setLineHidden(h, false);}),
-      onDeleteLine: function(line, f) {
-        if (typeof line == "number") {
-          if (!isLine(line)) return null;
-          line = getLine(line);
-        }
-        (line.handlers || (line.handlers = [])).push(f);
-        return line;
-      },
-      lineInfo: lineInfo,
-      getViewport: function() { return {from: showingFrom, to: showingTo};},
-      addWidget: function(pos, node, scroll, vert, horiz) {
-        pos = localCoords(clipPos(pos));
-        var top = pos.yBot, left = pos.x;
-        node.style.position = "absolute";
-        sizer.appendChild(node);
-        if (vert == "over") top = pos.y;
-        else if (vert == "near") {
-          var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
-              hspace = Math.max(sizer.clientWidth, lineSpace.clientWidth) - paddingLeft();
-          if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
-            top = pos.y - node.offsetHeight;
-          if (left + node.offsetWidth > hspace)
-            left = hspace - node.offsetWidth;
-        }
-        node.style.top = (top + paddingTop()) + "px";
-        node.style.left = node.style.right = "";
-        if (horiz == "right") {
-          left = sizer.clientWidth - node.offsetWidth;
-          node.style.right = "0px";
-        } else {
-          if (horiz == "left") left = 0;
-          else if (horiz == "middle") left = (sizer.clientWidth - node.offsetWidth) / 2;
-          node.style.left = (left + paddingLeft()) + "px";
+  }
+
+  function eventInWidget(display, e) {
+    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
+      if (!n) return true;
+      if (/\bCodeMirror-(?:line)?widget\b/.test(n.className) ||
+          n.parentNode == display.sizer && n != display.mover) return true;
+    }
+  }
+
+  function posFromMouse(cm, e, liberal) {
+    var display = cm.display;
+    if (!liberal) {
+      var target = e_target(e);
+      if (target == display.scrollbarH || target == display.scrollbarH.firstChild ||
+          target == display.scrollbarV || target == display.scrollbarV.firstChild ||
+          target == display.scrollbarFiller) return null;
+    }
+    var x, y, space = getRect(display.lineSpace);
+    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+    try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
+    return coordsChar(cm, x - space.left, y - space.top);
+  }
+
+  var lastClick, lastDoubleClick;
+  function onMouseDown(e) {
+    var cm = this, display = cm.display, doc = cm.doc, sel = doc.sel;
+    sel.shift = e.shiftKey;
+
+    if (eventInWidget(display, e)) {
+      if (!webkit) {
+        display.scroller.draggable = false;
+        setTimeout(function(){display.scroller.draggable = true;}, 100);
+      }
+      return;
+    }
+    if (clickInGutter(cm, e)) return;
+    var start = posFromMouse(cm, e);
+
+    switch (e_button(e)) {
+    case 3:
+      if (captureMiddleClick) onContextMenu.call(cm, cm, e);
+      return;
+    case 2:
+      if (start) extendSelection(cm.doc, start);
+      setTimeout(bind(focusInput, cm), 20);
+      e_preventDefault(e);
+      return;
+    }
+    // For button 1, if it was clicked inside the editor
+    // (posFromMouse returning non-null), we have to adjust the
+    // selection.
+    if (!start) {if (e_target(e) == display.scroller) e_preventDefault(e); return;}
+
+    if (!cm.state.focused) onFocus(cm);
+
+    var now = +new Date, type = "single";
+    if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
+      type = "triple";
+      e_preventDefault(e);
+      setTimeout(bind(focusInput, cm), 20);
+      selectLine(cm, start.line);
+    } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
+      type = "double";
+      lastDoubleClick = {time: now, pos: start};
+      e_preventDefault(e);
+      var word = findWordAt(getLine(doc, start.line).text, start);
+      extendSelection(cm.doc, word.from, word.to);
+    } else { lastClick = {time: now, pos: start}; }
+
+    var last = start;
+    if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) && !posEq(sel.from, sel.to) &&
+        !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
+      var dragEnd = operation(cm, function(e2) {
+        if (webkit) display.scroller.draggable = false;
+        cm.state.draggingText = false;
+        off(document, "mouseup", dragEnd);
+        off(display.scroller, "drop", dragEnd);
+        if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
+          e_preventDefault(e2);
+          extendSelection(cm.doc, start);
+          focusInput(cm);
         }
-        if (scroll)
-          scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight);
-      },
-
-      lineCount: function() {return doc.size;},
-      clipPos: clipPos,
-      getCursor: function(start) {
-        if (start == null) start = sel.inverted;
-        return copyPos(start ? sel.from : sel.to);
-      },
-      somethingSelected: function() {return !posEq(sel.from, sel.to);},
-      setCursor: operation(function(line, ch, user) {
-        if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
-        else setCursor(line, ch, user);
-      }),
-      setSelection: operation(function(from, to, user) {
-        (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
-      }),
-      getLine: function(line) {if (isLine(line)) return getLine(line).text;},
-      getLineHandle: function(line) {if (isLine(line)) return getLine(line);},
-      setLine: operation(function(line, text) {
-        if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length});
-      }),
-      removeLine: operation(function(line) {
-        if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0}));
-      }),
-      replaceRange: operation(replaceRange),
-      getRange: function(from, to, lineSep) {return getRange(clipPos(from), clipPos(to), lineSep);},
-
-      triggerOnKeyDown: operation(onKeyDown),
-      execCommand: function(cmd) {return commands[cmd](instance);},
-      // Stuff used by commands, probably not much use to outside code.
-      moveH: operation(moveH),
-      deleteH: operation(deleteH),
-      moveV: operation(moveV),
-      toggleOverwrite: function() {
-        if(overwrite){
-          overwrite = false;
-          cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
-        } else {
-          overwrite = true;
-          cursor.className += " CodeMirror-overwrite";
-        }
-      },
-
-      posFromIndex: function(off) {
-        var lineNo = 0, ch;
-        doc.iter(0, doc.size, function(line) {
-          var sz = line.text.length + 1;
-          if (sz > off) { ch = off; return true; }
-          off -= sz;
-          ++lineNo;
-        });
-        return clipPos({line: lineNo, ch: ch});
-      },
-      indexFromPos: function (coords) {
-        if (coords.line < 0 || coords.ch < 0) return 0;
-        var index = coords.ch;
-        doc.iter(0, coords.line, function (line) {
-          index += line.text.length + 1;
-        });
-        return index;
-      },
-      scrollTo: function(x, y) {
-        if (x != null) scroller.scrollLeft = x;
-        if (y != null) scrollbar.scrollTop = scroller.scrollTop = y;
-        updateDisplay([]);
-      },
-      getScrollInfo: function() {
-        return {x: scroller.scrollLeft, y: scrollbar.scrollTop,
-                height: scrollbar.scrollHeight, width: scroller.scrollWidth};
-      },
-      scrollIntoView: function(pos) {
-        var coords = localCoords(pos ? clipPos(pos) : sel.inverted ? sel.from : sel.to);
-        scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
-      },
-
-      setSize: function(width, height) {
-        function interpret(val) {
-          val = String(val);
-          return /^\d+$/.test(val) ? val + "px" : val;
-        }
-        if (width != null) wrapper.style.width = interpret(width);
-        if (height != null) scroller.style.height = interpret(height);
-        instance.refresh();
-      },
-
-      operation: function(f){return operation(f)();},
-      compoundChange: function(f){return compoundChange(f);},
-      refresh: function(){
-        updateDisplay(true, null, lastScrollTop);
-        if (scrollbar.scrollHeight > lastScrollTop)
-          scrollbar.scrollTop = lastScrollTop;
-      },
-      getInputField: function(){return input;},
-      getWrapperElement: function(){return wrapper;},
-      getScrollerElement: function(){return scroller;},
-      getGutterElement: function(){return gutter;}
-    };
-
-    function getLine(n) { return getLineAt(doc, n); }
-    function updateLineHeight(line, height) {
-      gutterDirty = true;
-      var diff = height - line.height;
-      for (var n = line; n; n = n.parent) n.height += diff;
-    }
-
-    function lineContent(line, wrapAt) {
-      if (!line.styles)
-        line.highlight(mode, line.stateAfter = getStateBefore(lineNo(line)), options.tabSize);
-      return line.getContent(options.tabSize, wrapAt, options.lineWrapping);
-    }
-
-    function setValue(code) {
-      var top = {line: 0, ch: 0};
-      updateLines(top, {line: doc.size - 1, ch: getLine(doc.size-1).text.length},
-                  splitLines(code), top, top);
-      updateInput = true;
-    }
-    function getValue(lineSep) {
-      var text = [];
-      doc.iter(0, doc.size, function(line) { text.push(line.text); });
-      return text.join(lineSep || "\n");
-    }
-
-    function onScrollBar(e) {
-      if (Math.abs(scrollbar.scrollTop - lastScrollTop) > 1) {
-        lastScrollTop = scroller.scrollTop = scrollbar.scrollTop;
-        updateDisplay([]);
+      });
+      // Let the drag handler handle this.
+      if (webkit) display.scroller.draggable = true;
+      cm.state.draggingText = dragEnd;
+      // IE's approach to draggable
+      if (display.scroller.dragDrop) display.scroller.dragDrop();
+      on(document, "mouseup", dragEnd);
+      on(display.scroller, "drop", dragEnd);
+      return;
+    }
+    e_preventDefault(e);
+    if (type == "single") extendSelection(cm.doc, clipPos(doc, start));
+
+    var startstart = sel.from, startend = sel.to, lastPos = start;
+
+    function doSelect(cur) {
+      if (posEq(lastPos, cur)) return;
+      lastPos = cur;
+
+      if (type == "single") {
+        extendSelection(cm.doc, clipPos(doc, start), cur);
+        return;
+      }
+
+      startstart = clipPos(doc, startstart);
+      startend = clipPos(doc, startend);
+      if (type == "double") {
+        var word = findWordAt(getLine(doc, cur.line).text, cur);
+        if (posLess(cur, startstart)) extendSelection(cm.doc, word.from, startend);
+        else extendSelection(cm.doc, startstart, word.to);
+      } else if (type == "triple") {
+        if (posLess(cur, startstart)) extendSelection(cm.doc, startend, clipPos(doc, Pos(cur.line, 0)));
+        else extendSelection(cm.doc, startstart, clipPos(doc, Pos(cur.line + 1, 0)));
       }
     }
 
-    function onScrollMain(e) {
-      if (options.fixedGutter && gutter.style.left != scroller.scrollLeft + "px")
-        gutter.style.left = scroller.scrollLeft + "px";
-      if (Math.abs(scroller.scrollTop - lastScrollTop) > 1) {
-        lastScrollTop = scroller.scrollTop;
-        if (scrollbar.scrollTop != lastScrollTop)
-          scrollbar.scrollTop = lastScrollTop;
-        updateDisplay([]);
+    var editorSize = getRect(display.wrapper);
+    // Used to ensure timeout re-tries don't fire when another extend
+    // happened in the meantime (clearTimeout isn't reliable -- at
+    // least on Chrome, the timeouts still happen even when cleared,
+    // if the clear happens after their scheduled firing time).
+    var counter = 0;
+
+    function extend(e) {
+      var curCount = ++counter;
+      var cur = posFromMouse(cm, e, true);
+      if (!cur) return;
+      if (!posEq(cur, last)) {
+        if (!cm.state.focused) onFocus(cm);
+        last = cur;
+        doSelect(cur);
+        var visible = visibleLines(display, doc);
+        if (cur.line >= visible.to || cur.line < visible.from)
+          setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
+      } else {
+        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
+        if (outside) setTimeout(operation(cm, function() {
+          if (counter != curCount) return;
+          display.scroller.scrollTop += outside;
+          extend(e);
+        }), 50);
       }
-      if (options.onScroll) options.onScroll(instance);
-    }
-
-    function onMouseDown(e) {
-      setShift(e_prop(e, "shiftKey"));
-      // Check whether this is a click in a widget
-      for (var n = e_target(e); n != wrapper; n = n.parentNode)
-        if (n.parentNode == sizer && n != mover) return;
-
-      // See if this is a click in the gutter
-      for (var n = e_target(e); n != wrapper; n = n.parentNode)
-        if (n.parentNode == gutterText) {
-          if (options.onGutterClick)
-            options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
-          return e_preventDefault(e);
-        }
-
-      var start = posFromMouse(e);
-
-      switch (e_button(e)) {
-      case 3:
-        if (gecko) onContextMenu(e);
-        return;
-      case 2:
-        if (start) setCursor(start.line, start.ch, true);
-        setTimeout(focusInput, 20);
-        e_preventDefault(e);
+    }
+
+    function done(e) {
+      counter = Infinity;
+      var cur = posFromMouse(cm, e);
+      if (cur) doSelect(cur);
+      e_preventDefault(e);
+      focusInput(cm);
+      off(document, "mousemove", move);
+      off(document, "mouseup", up);
+    }
+
+    var move = operation(cm, function(e) {
+      if (!ie && !e_button(e)) done(e);
+      else extend(e);
+    });
+    var up = operation(cm, done);
+    on(document, "mousemove", move);
+    on(document, "mouseup", up);
+  }
+
+  function onDrop(e) {
+    var cm = this;
+    if (eventInWidget(cm.display, e) || (cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))))
+      return;
+    e_preventDefault(e);
+    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
+    if (!pos || isReadOnly(cm)) return;
+    if (files && files.length && window.FileReader && window.File) {
+      var n = files.length, text = Array(n), read = 0;
+      var loadFile = function(file, i) {
+        var reader = new FileReader;
+        reader.onload = function() {
+          text[i] = reader.result;
+          if (++read == n) {
+            pos = clipPos(cm.doc, pos);
+            makeChange(cm.doc, {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"}, "around");
+          }
+        };
+        reader.readAsText(file);
+      };
+      for (var i = 0; i < n; ++i) loadFile(files[i], i);
+    } else {
+      // Don't do a replace if the drop happened inside of the selected text.
+      if (cm.state.draggingText && !(posLess(pos, cm.doc.sel.from) || posLess(cm.doc.sel.to, pos))) {
+        cm.state.draggingText(e);
+        // Ensure the editor is re-focused
+        setTimeout(bind(focusInput, cm), 20);
         return;
       }
-      // For button 1, if it was clicked inside the editor
-      // (posFromMouse returning non-null), we have to adjust the
-      // selection.
-      if (!start) {if (e_target(e) == scroller) e_preventDefault(e); return;}
-
-      if (!focused) onFocus();
-
-      var now = +new Date, type = "single";
-      if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
-        type = "triple";
-        e_preventDefault(e);
-        setTimeout(focusInput, 20);
-        selectLine(start.line);
-      } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
-        type = "double";
-        lastDoubleClick = {time: now, pos: start};
-        e_preventDefault(e);
-        var word = findWordAt(start);
-        setSelectionUser(word.from, word.to);
-      } else { lastClick = {time: now, pos: start}; }
-
-      function dragEnd(e2) {
-        if (webkit) scroller.draggable = false;
-        draggingText = false;
-        up(); drop();
-        if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
-          e_preventDefault(e2);
-          setCursor(start.line, start.ch, true);
-          focusInput();
+      try {
+        var text = e.dataTransfer.getData("Text");
+        if (text) {
+          var curFrom = cm.doc.sel.from, curTo = cm.doc.sel.to;
+          setSelection(cm.doc, pos, pos);
+          if (cm.state.draggingText) replaceRange(cm.doc, "", curFrom, curTo, "paste");
+          cm.replaceSelection(text, null, "paste");
+          focusInput(cm);
+          onFocus(cm);
         }
       }
-      var last = start, going;
-      if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&
-          !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
-        // Let the drag handler handle this.
-        if (webkit) scroller.draggable = true;
-        var up = connect(document, "mouseup", operation(dragEnd), true);
-        var drop = connect(scroller, "drop", operation(dragEnd), true);
-        draggingText = true;
-        // IE's approach to draggable
-        if (scroller.dragDrop) scroller.dragDrop();
-        return;
+      catch(e){}
+    }
+  }
+
+  function clickInGutter(cm, e) {
+    var display = cm.display;
+    try { var mX = e.clientX, mY = e.clientY; }
+    catch(e) { return false; }
+
+    if (mX >= Math.floor(getRect(display.gutters).right)) return false;
+    e_preventDefault(e);
+    if (!hasHandler(cm, "gutterClick")) return true;
+
+    var lineBox = getRect(display.lineDiv);
+    if (mY > lineBox.bottom) return true;
+    mY -= lineBox.top - display.viewOffset;
+
+    for (var i = 0; i < cm.options.gutters.length; ++i) {
+      var g = display.gutters.childNodes[i];
+      if (g && getRect(g).right >= mX) {
+        var line = lineAtHeight(cm.doc, mY);
+        var gutter = cm.options.gutters[i];
+        signalLater(cm, "gutterClick", cm, line, gutter, e);
+        break;
+      }
+    }
+    return true;
+  }
+
+  function onDragStart(cm, e) {
+    if (ie && !cm.state.draggingText) { e_stop(e); return; }
+    if (eventInWidget(cm.display, e)) return;
+
+    var txt = cm.getSelection();
+    e.dataTransfer.setData("Text", txt);
+
+    // Use dummy image instead of default browsers image.
+    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
+    if (e.dataTransfer.setDragImage) {
+      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
+      if (opera) {
+        img.width = img.height = 1;
+        cm.display.wrapper.appendChild(img);
+        // Force a relayout, or Opera won't use our image for some obscure reason
+        img._top = img.offsetTop;
+      }
+      if (safari) {
+        if (cm.display.dragImg) {
+          img = cm.display.dragImg;
+        } else {
+          cm.display.dragImg = img;
+          img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
+          cm.display.wrapper.appendChild(img);
+        }
       }
-      e_preventDefault(e);
-      if (type == "single") setCursor(start.line, start.ch, true);
-
-      var startstart = sel.from, startend = sel.to;
-
-      function doSelect(cur) {
-        if (type == "single") {
-          setSelectionUser(start, cur);
-        } else if (type == "double") {
-          var word = findWordAt(cur);
-          if (posLess(cur, startstart)) setSelectionUser(word.from, startend);
-          else setSelectionUser(startstart, word.to);
-        } else if (type == "triple") {
-          if (posLess(cur, startstart)) setSelectionUser(startend, clipPos({line: cur.line, ch: 0}));
-          else setSelectionUser(startstart, clipPos({line: cur.line + 1, ch: 0}));
+      e.dataTransfer.setDragImage(img, 0, 0);
+      if (opera) img.parentNode.removeChild(img);
+    }
+  }
+
+  function setScrollTop(cm, val) {
+    if (Math.abs(cm.doc.scrollTop - val) < 2) return;
+    cm.doc.scrollTop = val;
+    if (!gecko) updateDisplay(cm, [], val);
+    if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
+    if (cm.display.scrollbarV.scrollTop != val) cm.display.scrollbarV.scrollTop = val;
+    if (gecko) updateDisplay(cm, []);
+  }
+  function setScrollLeft(cm, val, isScroller) {
+    if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
+    val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
+    cm.doc.scrollLeft = val;
+    alignHorizontally(cm);
+    if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
+    if (cm.display.scrollbarH.scrollLeft != val) cm.display.scrollbarH.scrollLeft = val;
+  }
+
+  // Since the delta values reported on mouse wheel events are
+  // unstandardized between browsers and even browser versions, and
+  // generally horribly unpredictable, this code starts by measuring
+  // the scroll effect that the first few mouse wheel events have,
+  // and, from that, detects the way it can convert deltas to pixel
+  // offsets afterwards.
+  //
+  // The reason we want to know the amount a wheel event will scroll
+  // is that it gives us a chance to update the display before the
+  // actual scrolling happens, reducing flickering.
+
+  var wheelSamples = 0, wheelPixelsPerUnit = null;
+  // Fill in a browser-detected starting value on browsers where we
+  // know one. These don't have to be accurate -- the result of them
+  // being wrong would just be a slight flicker on the first wheel
+  // scroll (if it is large enough).
+  if (ie) wheelPixelsPerUnit = -.53;
+  else if (gecko) wheelPixelsPerUnit = 15;
+  else if (chrome) wheelPixelsPerUnit = -.7;
+  else if (safari) wheelPixelsPerUnit = -1/3;
+
+  function onScrollWheel(cm, e) {
+    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
+    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
+    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
+    else if (dy == null) dy = e.wheelDelta;
+
+    var display = cm.display, scroll = display.scroller;
+    // Quit if there's nothing to scroll here
+    if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
+          dy && scroll.scrollHeight > scroll.clientHeight)) return;
+
+    // Webkit browsers on OS X abort momentum scrolls when the target
+    // of the scroll event is removed from the scrollable element.
+    // This hack (see related code in patchDisplay) makes sure the
+    // element is kept around.
+    if (dy && mac && webkit) {
+      for (var cur = e.target; cur != scroll; cur = cur.parentNode) {
+        if (cur.lineObj) {
+          cm.display.currentWheelTarget = cur;
+          break;
         }
       }
-
-      function extend(e) {
-        var cur = posFromMouse(e, true);
-        if (cur && !posEq(cur, last)) {
-          if (!focused) onFocus();
-          last = cur;
-          doSelect(cur);
-          updateInput = false;
-          var visible = visibleLines();
-          if (cur.line >= visible.to || cur.line < visible.from)
-            going = setTimeout(operation(function(){extend(e);}), 150);
+    }
+
+    // On some browsers, horizontal scrolling will cause redraws to
+    // happen before the gutter has been realigned, causing it to
+    // wriggle around in a most unseemly way. When we have an
+    // estimated pixels/delta value, we just handle horizontal
+    // scrolling entirely here. It'll be slightly off from native, but
+    // better than glitching out.
+    if (dx && !gecko && !opera && wheelPixelsPerUnit != null) {
+      if (dy)
+        setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
+      setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
+      e_preventDefault(e);
+      display.wheelStartX = null; // Abort measurement, if in progress
+      return;
+    }
+
+    if (dy && wheelPixelsPerUnit != null) {
+      var pixels = dy * wheelPixelsPerUnit;
+      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
+      if (pixels < 0) top = Math.max(0, top + pixels - 50);
+      else bot = Math.min(cm.doc.height, bot + pixels + 50);
+      updateDisplay(cm, [], {top: top, bottom: bot});
+    }
+
+    if (wheelSamples < 20) {
+      if (display.wheelStartX == null) {
+        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
+        display.wheelDX = dx; display.wheelDY = dy;
+        setTimeout(function() {
+          if (display.wheelStartX == null) return;
+          var movedX = scroll.scrollLeft - display.wheelStartX;
+          var movedY = scroll.scrollTop - display.wheelStartY;
+          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
+            (movedX && display.wheelDX && movedX / display.wheelDX);
+          display.wheelStartX = display.wheelStartY = null;
+          if (!sample) return;
+          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
+          ++wheelSamples;
+        }, 200);
+      } else {
+        display.wheelDX += dx; display.wheelDY += dy;
+      }
+    }
+  }
+
+  function doHandleBinding(cm, bound, dropShift) {
+    if (typeof bound == "string") {
+      bound = commands[bound];
+      if (!bound) return false;
+    }
+    // Ensure previous input has been read, so that the handler sees a
+    // consistent view of the document
+    if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;
+    var doc = cm.doc, prevShift = doc.sel.shift, done = false;
+    try {
+      if (isReadOnly(cm)) cm.state.suppressEdits = true;
+      if (dropShift) doc.sel.shift = false;
+      done = bound(cm) != Pass;
+    } finally {
+      doc.sel.shift = prevShift;
+      cm.state.suppressEdits = false;
+    }
+    return done;
+  }
+
+  function allKeyMaps(cm) {
+    var maps = cm.state.keyMaps.slice(0);
+    if (cm.options.extraKeys) maps.push(cm.options.extraKeys);
+    maps.push(cm.options.keyMap);
+    return maps;
+  }
+
+  var maybeTransition;
+  function handleKeyBinding(cm, e) {
+    // Handle auto keymap transitions
+    var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;
+    clearTimeout(maybeTransition);
+    if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
+      if (getKeyMap(cm.options.keyMap) == startMap)
+        cm.options.keyMap = (next.call ? next.call(null, cm) : next);
+    }, 50);
+
+    var name = keyName(e, true), handled = false;
+    if (!name) return false;
+    var keymaps = allKeyMaps(cm);
+
+    if (e.shiftKey) {
+      // First try to resolve full name (including 'Shift-'). Failing
+      // that, see if there is a cursor-motion command (starting with
+      // 'go') bound to the keyname without 'Shift-'.
+      handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})
+             || lookupKey(name, keymaps, function(b) {
+                  if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(cm, b);
+                });
+    } else {
+      handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });
+    }
+    if (handled == "stop") handled = false;
+
+    if (handled) {
+      e_preventDefault(e);
+      restartBlink(cm);
+      if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
+    }
+    return handled;
+  }
+
+  function handleCharBinding(cm, e, ch) {
+    var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),
+                            function(b) { return doHandleBinding(cm, b, true); });
+    if (handled) {
+      e_preventDefault(e);
+      restartBlink(cm);
+    }
+    return handled;
+  }
+
+  var lastStoppedKey = null;
+  function onKeyDown(e) {
+    var cm = this;
+    if (!cm.state.focused) onFocus(cm);
+    if (ie && e.keyCode == 27) { e.returnValue = false; }
+    if (cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
+    var code = e.keyCode;
+    // IE does strange things with escape.
+    cm.doc.sel.shift = code == 16 || e.shiftKey;
+    // First give onKeyEvent option a chance to handle this.
+    var handled = handleKeyBinding(cm, e);
+    if (opera) {
+      lastStoppedKey = handled ? code : null;
+      // Opera has no cut event... we try to at least catch the key combo
+      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
+        cm.replaceSelection("");
+    }
+  }
+
+  function onKeyPress(e) {
+    var cm = this;
+    if (cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
+    var keyCode = e.keyCode, charCode = e.charCode;
+    if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
+    if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;
+    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
+    if (this.options.electricChars && this.doc.mode.electricChars &&
+        this.options.smartIndent && !isReadOnly(this) &&
+        this.doc.mode.electricChars.indexOf(ch) > -1)
+      setTimeout(operation(cm, function() {indentLine(cm, cm.doc.sel.to.line, "smart");}), 75);
+    if (handleCharBinding(cm, e, ch)) return;
+    if (ie && !ie_lt9) cm.display.inputHasSelection = null;
+    fastPoll(cm);
+  }
+
+  function onFocus(cm) {
+    if (cm.options.readOnly == "nocursor") return;
+    if (!cm.state.focused) {
+      signal(cm, "focus", cm);
+      cm.state.focused = true;
+      if (cm.display.wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
+        cm.display.wrapper.className += " CodeMirror-focused";
+      resetInput(cm, true);
+    }
+    slowPoll(cm);
+    restartBlink(cm);
+  }
+  function onBlur(cm) {
+    if (cm.state.focused) {
+      signal(cm, "blur", cm);
+      cm.state.focused = false;
+      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-focused", "");
+    }
+    clearInterval(cm.display.blinker);
+    setTimeout(function() {if (!cm.state.focused) cm.doc.sel.shift = false;}, 150);
+  }
+
+  var detectingSelectAll;
+  function onContextMenu(cm, e) {
+    var display = cm.display, sel = cm.doc.sel;
+    if (eventInWidget(display, e)) return;
+
+    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
+    if (!pos || opera) return; // Opera is difficult.
+    if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
+      operation(cm, setSelection)(cm.doc, pos, pos);
+
+    var oldCSS = display.input.style.cssText;
+    display.inputDiv.style.position = "absolute";
+    display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
+      "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; outline: none;" +
+      "border-width: 0; outline: none; overflow: hidden; opacity: .05; -ms-opacity: .05; filter: alpha(opacity=5);";
+    focusInput(cm);
+    resetInput(cm, true);
+    // Adds "Select all" to context menu in FF
+    if (posEq(sel.from, sel.to)) display.input.value = display.prevInput = " ";
+
+    function rehide() {
+      display.inputDiv.style.position = "relative";
+      display.input.style.cssText = oldCSS;
+      if (ie_lt9) display.scrollbarV.scrollTop = display.scroller.scrollTop = scrollPos;
+      slowPoll(cm);
+
+      // Try to detect the user choosing select-all
+      if (display.input.selectionStart != null && (!ie || ie_lt9)) {
+        clearTimeout(detectingSelectAll);
+        var extval = display.input.value = " " + (posEq(sel.from, sel.to) ? "" : display.input.value), i = 0;
+        display.prevInput = " ";
+        display.input.selectionStart = 1; display.input.selectionEnd = extval.length;
+        var poll = function(){
+          if (display.prevInput == " " && display.input.selectionStart == 0)
+            operation(cm, commands.selectAll)(cm);
+          else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
+          else resetInput(cm);
+        };
+        detectingSelectAll = setTimeout(poll, 200);
+      }
+    }
+
+    if (captureMiddleClick) {
+      e_stop(e);
+      var mouseup = function() {
+        off(window, "mouseup", mouseup);
+        setTimeout(rehide, 20);
+      };
+      on(window, "mouseup", mouseup);
+    } else {
+      setTimeout(rehide, 50);
+    }
+  }
+
+  // UPDATING
+
+  function changeEnd(change) {
+    if (!change.text) return change.to;
+    return Pos(change.from.line + change.text.length - 1,
+               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
+  }
+
+  // Make sure a position will be valid after the given change.
+  function clipPostChange(doc, change, pos) {
+    if (!posLess(change.from, pos)) return clipPos(doc, pos);
+    var diff = (change.text.length - 1) - (change.to.line - change.from.line);
+    if (pos.line > change.to.line + diff) {
+      var preLine = pos.line - diff, lastLine = doc.first + doc.size - 1;
+      if (preLine > lastLine) return Pos(lastLine, getLine(doc, lastLine).text.length);
+      return clipToLen(pos, getLine(doc, preLine).text.length);
+    }
+    if (pos.line == change.to.line + diff)
+      return clipToLen(pos, lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0) +
+                       getLine(doc, change.to.line).text.length - change.to.ch);
+    var inside = pos.line - change.from.line;
+    return clipToLen(pos, change.text[inside].length + (inside ? 0 : change.from.ch));
+  }
+
+  // Hint can be null|"end"|"start"|"around"|{anchor,head}
+  function computeSelAfterChange(doc, change, hint) {
+    if (hint && typeof hint == "object") // Assumed to be {anchor, head} object
+      return {anchor: clipPostChange(doc, change, hint.anchor),
+              head: clipPostChange(doc, change, hint.head)};
+
+    if (hint == "start") return {anchor: change.from, head: change.from};
+
+    var end = changeEnd(change);
+    if (hint == "around") return {anchor: change.from, head: end};
+    if (hint == "end") return {anchor: end, head: end};
+
+    // hint is null, leave the selection alone as much as possible
+    var adjustPos = function(pos) {
+      if (posLess(pos, change.from)) return pos;
+      if (!posLess(change.to, pos)) return end;
+
+      var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
+      if (pos.line == change.to.line) ch += end.ch - change.to.ch;
+      return Pos(line, ch);
+    };
+    return {anchor: adjustPos(doc.sel.anchor), head: adjustPos(doc.sel.head)};
+  }
+
+  function filterChange(doc, change) {
+    var obj = {
+      canceled: false,
+      from: change.from,
+      to: change.to,
+      text: change.text,
+      origin: change.origin,
+      update: function(from, to, text, origin) {
+        if (from) this.from = clipPos(doc, from);
+        if (to) this.to = clipPos(doc, to);
+        if (text) this.text = text;
+        if (origin !== undefined) this.origin = origin;
+      },
+      cancel: function() { this.canceled = true; }
+    };
+    signal(doc, "beforeChange", doc, obj);
+    if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
+
+    if (obj.canceled) return null;
+    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
+  }
+
+  // Replace the range from from to to by the strings in replacement.
+  // change is a {from, to, text [, origin]} object
+  function makeChange(doc, change, selUpdate, ignoreReadOnly) {
+    if (doc.cm) {
+      if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, selUpdate, ignoreReadOnly);
+      if (doc.cm.state.suppressEdits) return;
+    }
+
+    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
+      change = filterChange(doc, change);
+      if (!change) return;
+    }
+
+    // Possibly split or suppress the update based on the presence
+    // of read-only spans in its range.
+    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
+    if (split) {
+      for (var i = split.length - 1; i >= 1; --i)
+        makeChangeNoReadonly(doc, {from: split[i].from, to: split[i].to, text: [""]});
+      if (split.length)
+        makeChangeNoReadonly(doc, {from: split[0].from, to: split[0].to, text: change.text}, selUpdate);
+    } else {
+      makeChangeNoReadonly(doc, change, selUpdate);
+    }
+  }
+
+  function makeChangeNoReadonly(doc, change, selUpdate) {
+    var selAfter = computeSelAfterChange(doc, change, selUpdate);
+    addToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
+
+    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
+    var rebased = [];
+
+    linkedDocs(doc, function(doc, sharedHist) {
+      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+        rebaseHist(doc.history, change);
+        rebased.push(doc.history);
+      }
+      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
+    });
+  }
+
+  function makeChangeFromHistory(doc, type) {
+    if (doc.cm && doc.cm.state.suppressEdits) return;
+
+    var hist = doc.history;
+    var event = (type == "undo" ? hist.done : hist.undone).pop();
+    if (!event) return;
+    hist.dirtyCounter += type == "undo" ? -1 : 1;
+
+    var anti = {changes: [], anchorBefore: event.anchorAfter, headBefore: event.headAfter,
+                anchorAfter: event.anchorBefore, headAfter: event.headBefore};
+    (type == "undo" ? hist.undone : hist.done).push(anti);
+
+    for (var i = event.changes.length - 1; i >= 0; --i) {
+      var change = event.changes[i];
+      change.origin = type;
+      anti.changes.push(historyChangeFromChange(doc, change));
+
+      var after = i ? computeSelAfterChange(doc, change, null)
+                    : {anchor: event.anchorBefore, head: event.headBefore};
+      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
+      var rebased = [];
+
+      linkedDocs(doc, function(doc, sharedHist) {
+        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+          rebaseHist(doc.history, change);
+          rebased.push(doc.history);
+        }
+        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
+      });
+    }
+  }
+
+  function shiftDoc(doc, distance) {
+    function shiftPos(pos) {return Pos(pos.line + distance, pos.ch);}
+    doc.first += distance;
+    if (doc.cm) regChange(doc.cm, doc.first, doc.first, distance);
+    doc.sel.head = shiftPos(doc.sel.head); doc.sel.anchor = shiftPos(doc.sel.anchor);
+    doc.sel.from = shiftPos(doc.sel.from); doc.sel.to = shiftPos(doc.sel.to);
+  }
+
+  function makeChangeSingleDoc(doc, change, selAfter, spans) {
+    if (doc.cm && !doc.cm.curOp)
+      return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
+
+    if (change.to.line < doc.first) {
+      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
+      return;
+    }
+    if (change.from.line > doc.lastLine()) return;
+
+    // Clip the change to the size of this doc
+    if (change.from.line < doc.first) {
+      var shift = change.text.length - 1 - (doc.first - change.from.line);
+      shiftDoc(doc, shift);
+      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
+                text: [lst(change.text)], origin: change.origin};
+    }
+    var last = doc.lastLine();
+    if (change.to.line > last) {
+      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
+                text: [change.text[0]], origin: change.origin};
+    }
+
+    change.removed = getBetween(doc, change.from, change.to);
+
+    if (!selAfter) selAfter = computeSelAfterChange(doc, change, null);
+    if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans, selAfter);
+    else updateDoc(doc, change, spans, selAfter);
+  }
+
+  function makeChangeSingleDocInEditor(cm, change, spans, selAfter) {
+    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
+
+    var recomputeMaxLength = false, checkWidthStart = from.line;
+    if (!cm.options.lineWrapping) {
+      checkWidthStart = lineNo(visualLine(doc, getLine(doc, from.line)));
+      doc.iter(checkWidthStart, to.line + 1, function(line) {
+        if (line == display.maxLine) {
+          recomputeMaxLength = true;
+          return true;
+        }
+      });
+    }
+
+    if (!posLess(doc.sel.head, change.from) && !posLess(change.to, doc.sel.head))
+      cm.curOp.cursorActivity = true;
+
+    updateDoc(doc, change, spans, selAfter, estimateHeight(cm));
+
+    if (!cm.options.lineWrapping) {
+      doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
+        var len = lineLength(doc, line);
+        if (len > display.maxLineLength) {
+          display.maxLine = line;
+          display.maxLineLength = len;
+          display.maxLineChanged = true;
+          recomputeMaxLength = false;
+        }
+      });
+      if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
+    }
+
+    // Adjust frontier, schedule worker
+    doc.frontier = Math.min(doc.frontier, from.line);
+    startWorker(cm, 400);
+
+    var lendiff = change.text.length - (to.line - from.line) - 1;
+    // Remember that these lines changed, for updating the display
+    regChange(cm, from.line, to.line + 1, lendiff);
+
+    if (hasHandler(cm, "change")) {
+      var changeObj = {from: from, to: to,
+                       text: change.text,
+                       removed: change.removed,
+                       origin: change.origin};
+      if (cm.curOp.textChanged) {
+        for (var cur = cm.curOp.textChanged; cur.next; cur = cur.next) {}
+        cur.next = changeObj;
+      } else cm.curOp.textChanged = changeObj;
+    }
+  }
+
+  function replaceRange(doc, code, from, to, origin) {
+    if (!to) to = from;
+    if (posLess(to, from)) { var tmp = to; to = from; from = tmp; }
+    if (typeof code == "string") code = splitLines(code);
+    makeChange(doc, {from: from, to: to, text: code, origin: origin}, null);
+  }
+
+  // POSITION OBJECT
+
+  function Pos(line, ch) {
+    if (!(this instanceof Pos)) return new Pos(line, ch);
+    this.line = line; this.ch = ch;
+  }
+  CodeMirror.Pos = Pos;
+
+  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
+  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
+  function copyPos(x) {return Pos(x.line, x.ch);}
+
+  // SELECTION
+
+  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
+  function clipPos(doc, pos) {
+    if (pos.line < doc.first) return Pos(doc.first, 0);
+    var last = doc.first + doc.size - 1;
+    if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
+    return clipToLen(pos, getLine(doc, pos.line).text.length);
+  }
+  function clipToLen(pos, linelen) {
+    var ch = pos.ch;
+    if (ch == null || ch > linelen) return Pos(pos.line, linelen);
+    else if (ch < 0) return Pos(pos.line, 0);
+    else return pos;
+  }
+  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
+
+  // If shift is held, this will move the selection anchor. Otherwise,
+  // it'll set the whole selection.
+  function extendSelection(doc, pos, other, bias) {
+    if (doc.sel.shift || doc.sel.extend) {
+      var anchor = doc.sel.anchor;
+      if (other) {
+        var posBefore = posLess(pos, anchor);
+        if (posBefore != posLess(other, anchor)) {
+          anchor = pos;
+          pos = other;
+        } else if (posBefore != posLess(pos, other)) {
+          pos = other;
         }
       }
-
-      function done(e) {
-        clearTimeout(going);
-        var cur = posFromMouse(e);
-        if (cur) doSelect(cur);
-        e_preventDefault(e);
-        focusInput();
-        updateInput = true;
-        move(); up();
-      }
-      var move = connect(document, "mousemove", operation(function(e) {
-        clearTimeout(going);
-        e_preventDefault(e);
-        if (!ie && !e_button(e)) done(e);
-        else extend(e);
-      }), true);
-      var up = connect(document, "mouseup", operation(done), true);
-    }
-    function onDoubleClick(e) {
-      for (var n = e_target(e); n != wrapper; n = n.parentNode)
-        if (n.parentNode == gutterText) return e_preventDefault(e);
-      e_preventDefault(e);
-    }
-    function onDrop(e) {
-      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
-      e_preventDefault(e);
-      var pos = posFromMouse(e, true), files = e.dataTransfer.files;
-      if (!pos || options.readOnly) return;
-      if (files && files.length && window.FileReader && window.File) {
-        var n = files.length, text = Array(n), read = 0;
-        var loadFile = function(file, i) {
-          var reader = new FileReader;
-          reader.onload = function() {
-            text[i] = reader.result;
-            if (++read == n) {
-              pos = clipPos(pos);
-              operation(function() {
-                var end = replaceRange(text.join(""), pos, pos);
-                setSelectionUser(pos, end);
-              })();
+      setSelection(doc, anchor, pos, bias);
+    } else {
+      setSelection(doc, pos, other || pos, bias);
+    }
+    if (doc.cm) doc.cm.curOp.userSelChange = true;
+  }
+
+  function filterSelectionChange(doc, anchor, head) {
+    var obj = {anchor: anchor, head: head};
+    signal(doc, "beforeSelectionChange", doc, obj);
+    if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
+    obj.anchor = clipPos(doc, obj.anchor); obj.head = clipPos(doc, obj.head);
+    return obj;
+  }
+
+  // Update the selection. Last two args are only used by
+  // updateDoc, since they have to be expressed in the line
+  // numbers before the update.
+  function setSelection(doc, anchor, head, bias, checkAtomic) {
+    if (!checkAtomic && hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
+      var filtered = filterSelectionChange(doc, anchor, head);
+      head = filtered.head;
+      anchor = filtered.anchor;
+    }
+
+    var sel = doc.sel;
+    sel.goalColumn = null;
+    // Skip over atomic spans.
+    if (checkAtomic || !posEq(anchor, sel.anchor))
+      anchor = skipAtomic(doc, anchor, bias, checkAtomic != "push");
+    if (checkAtomic || !posEq(head, sel.head))
+      head = skipAtomic(doc, head, bias, checkAtomic != "push");
+
+    if (posEq(sel.anchor, anchor) && posEq(sel.head, head)) return;
+
+    sel.anchor = anchor; sel.head = head;
+    var inv = posLess(head, anchor);
+    sel.from = inv ? head : anchor;
+    sel.to = inv ? anchor : head;
+
+    if (doc.cm)
+      doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged =
+        doc.cm.curOp.cursorActivity = true;
+
+    signalLater(doc, "cursorActivity", doc);
+  }
+
+  function reCheckSelection(cm) {
+    setSelection(cm.doc, cm.doc.sel.from, cm.doc.sel.to, null, "push");
+  }
+
+  function skipAtomic(doc, pos, bias, mayClear) {
+    var flipped = false, curPos = pos;
+    var dir = bias || 1;
+    doc.cantEdit = false;
+    search: for (;;) {
+      var line = getLine(doc, curPos.line);
+      if (line.markedSpans) {
+        for (var i = 0; i < line.markedSpans.length; ++i) {
+          var sp = line.markedSpans[i], m = sp.marker;
+          if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
+              (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
+            if (mayClear) {
+              signal(m, "beforeCursorEnter");
+              if (m.explicitlyCleared) {
+                if (!line.markedSpans) break;
+                else {--i; continue;}
+              }
             }
-          };
-          reader.readAsText(file);
-        };
-        for (var i = 0; i < n; ++i) loadFile(files[i], i);
-      } else {
-        // Don't do a replace if the drop happened inside of the selected text.
-        if (draggingText && !(posLess(pos, sel.from) || posLess(sel.to, pos))) return;
-        try {
-          var text = e.dataTransfer.getData("Text");
-          if (text) {
-            compoundChange(function() {
-              var curFrom = sel.from, curTo = sel.to;
-              setSelectionUser(pos, pos);
-              if (draggingText) replaceRange("", curFrom, curTo);
-              replaceSelection(text);
-              focusInput();
-            });
+            if (!m.atomic) continue;
+            var newPos = m.find()[dir < 0 ? "from" : "to"];
+            if (posEq(newPos, curPos)) {
+              newPos.ch += dir;
+              if (newPos.ch < 0) {
+                if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
+                else newPos = null;
+              } else if (newPos.ch > line.text.length) {
+                if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
+                else newPos = null;
+              }
+              if (!newPos) {
+                if (flipped) {
+                  // Driven in a corner -- no valid cursor position found at all
+                  // -- try again *with* clearing, if we didn't already
+                  if (!mayClear) return skipAtomic(doc, pos, bias, true);
+                  // Otherwise, turn off editing until further notice, and return the start of the doc
+                  doc.cantEdit = true;
+                  return Pos(doc.first, 0);
+                }
+                flipped = true; newPos = pos; dir = -dir;
+              }
+            }
+            curPos = newPos;
+            continue search;
           }
         }
-        catch(e){}
-      }
-    }
-    function onDragStart(e) {
-      var txt = getSelection();
-      e.dataTransfer.setData("Text", txt);
-
-      // Use dummy image instead of default browsers image.
-      if (e.dataTransfer.setDragImage)
-        e.dataTransfer.setDragImage(elt('img'), 0, 0);
-    }
-
-    function doHandleBinding(bound, dropShift) {
-      if (typeof bound == "string") {
-        bound = commands[bound];
-        if (!bound) return false;
-      }
-      var prevShift = shiftSelecting;
-      try {
-        if (options.readOnly) suppressEdits = true;
-        if (dropShift) shiftSelecting = null;
-        bound(instance);
-      } catch(e) {
-        if (e != Pass) throw e;
-        return false;
-      } finally {
-        shiftSelecting = prevShift;
-        suppressEdits = false;
-      }
-      return true;
-    }
-    var maybeTransition;
-    function handleKeyBinding(e) {
-      // Handle auto keymap transitions
-      var startMap = getKeyMap(options.keyMap), next = startMap.auto;
-      clearTimeout(maybeTransition);
-      if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
-        if (getKeyMap(options.keyMap) == startMap) {
-          options.keyMap = (next.call ? next.call(null, instance) : next);
-        }
-      }, 50);
-
-      var name = keyNames[e_prop(e, "keyCode")], handled = false;
-      var flipCtrlCmd = opera && mac;
-      if (name == null || e.altGraphKey) return false;
-      if (e_prop(e, "altKey")) name = "Alt-" + name;
-      if (e_prop(e, flipCtrlCmd ? "metaKey" : "ctrlKey")) name = "Ctrl-" + name;
-      if (e_prop(e, flipCtrlCmd ? "ctrlKey" : "metaKey")) name = "Cmd-" + name;
-
-      var stopped = false;
-      function stop() { stopped = true; }
-
-      if (e_prop(e, "shiftKey")) {
-        handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
-                            function(b) {return doHandleBinding(b, true);}, stop)
-               || lookupKey(name, options.extraKeys, options.keyMap, function(b) {
-                 if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
-               }, stop);
-      } else {
-        handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
-      }
-      if (stopped) handled = false;
-      if (handled) {
-        e_preventDefault(e);
-        restartBlink();
-        if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
-      }
-      return handled;
-    }
-    function handleCharBinding(e, ch) {
-      var handled = lookupKey("'" + ch + "'", options.extraKeys,
-                              options.keyMap, function(b) { return doHandleBinding(b, true); });
-      if (handled) {
-        e_preventDefault(e);
-        restartBlink();
       }
-      return handled;
-    }
-
-    var lastStoppedKey = null;
-    function onKeyDown(e) {
-      if (!focused) onFocus();
-      if (ie && e.keyCode == 27) { e.returnValue = false; }
-      if (pollingFast) { if (readInput()) pollingFast = false; }
-      if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
-      var code = e_prop(e, "keyCode");
-      // IE does strange things with escape.
-      setShift(code == 16 || e_prop(e, "shiftKey"));
-      // First give onKeyEvent option a chance to handle this.
-      var handled = handleKeyBinding(e);
-      if (opera) {
-        lastStoppedKey = handled ? code : null;
-        // Opera has no cut event... we try to at least catch the key combo
-        if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey"))
-          replaceSelection("");
-      }
-    }
-    function onKeyPress(e) {
-      if (pollingFast) readInput();
-      if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
-      var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
-      if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
-      if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(e)) return;
-      var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
-      if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
-        if (mode.electricChars.indexOf(ch) > -1)
-          setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 75);
+      return curPos;
+    }
+  }
+
+  // SCROLLING
+
+  function scrollCursorIntoView(cm) {
+    var coords = scrollPosIntoView(cm, cm.doc.sel.head);
+    if (!cm.state.focused) return;
+    var display = cm.display, box = getRect(display.sizer), doScroll = null, pTop = paddingTop(cm.display);
+    if (coords.top + pTop + box.top < 0) doScroll = true;
+    else if (coords.bottom + pTop + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
+    if (doScroll != null && !phantom) {
+      var hidden = display.cursor.style.display == "none";
+      if (hidden) {
+        display.cursor.style.display = "";
+        display.cursor.style.left = coords.left + "px";
+        display.cursor.style.top = (coords.top - display.viewOffset) + "px";
       }
-      if (handleCharBinding(e, ch)) return;
-      fastPoll();
-    }
-    function onKeyUp(e) {
-      if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
-      if (e_prop(e, "keyCode") == 16) shiftSelecting = null;
-    }
-
-    function onFocus() {
-      if (options.readOnly == "nocursor") return;
-      if (!focused) {
-        if (options.onFocus) options.onFocus(instance);
-        focused = true;
-        if (scroller.className.search(/\bCodeMirror-focused\b/) == -1)
-          scroller.className += " CodeMirror-focused";
+      display.cursor.scrollIntoView(doScroll);
+      if (hidden) display.cursor.style.display = "none";
+    }
+  }
+
+  function scrollPosIntoView(cm, pos, margin) {
+    if (margin == null) margin = 0;
+    for (;;) {
+      var changed = false, coords = cursorCoords(cm, pos);
+      var scrollPos = calculateScrollPos(cm, coords.left, coords.top - margin, coords.left, coords.bottom + margin);
+      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
+      if (scrollPos.scrollTop != null) {
+        setScrollTop(cm, scrollPos.scrollTop);
+        if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
       }
-      slowPoll();
-      restartBlink();
-    }
-    function onBlur() {
-      if (focused) {
-        if (options.onBlur) options.onBlur(instance);
-        focused = false;
-        if (bracketHighlighted)
-          operation(function(){
-            if (bracketHighlighted) { bracketHighlighted(); bracketHighlighted = null; }
-          })();
-        scroller.className = scroller.className.replace(" CodeMirror-focused", "");
-      }
-      clearInterval(blinker);
-      setTimeout(function() {if (!focused) shiftSelecting = null;}, 150);
-    }
-
-    // Replace the range from from to to by the strings in newText.
-    // Afterwards, set the selection to selFrom, selTo.
-    function updateLines(from, to, newText, selFrom, selTo) {
-      if (suppressEdits) return;
-      var old = [];
-      doc.iter(from.line, to.line + 1, function(line) {
-        old.push(newHL(line.text, line.markedSpans));
-      });
-      if (history) {
-        history.addChange(from.line, newText.length, old);
-        while (history.done.length > options.undoDepth) history.done.shift();
+      if (scrollPos.scrollLeft != null) {
+        setScrollLeft(cm, scrollPos.scrollLeft);
+        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
       }
-      var lines = updateMarkedSpans(hlSpans(old[0]), hlSpans(lst(old)), from.ch, to.ch, newText);
-      updateLinesNoUndo(from, to, lines, selFrom, selTo);
-    }
-    function unredoHelper(from, to) {
-      if (!from.length) return;
-      var set = from.pop(), out = [];
-      for (var i = set.length - 1; i >= 0; i -= 1) {
-        var change = set[i];
-        var replaced = [], end = change.start + change.added;
-        doc.iter(change.start, end, function(line) { replaced.push(newHL(line.text, line.markedSpans)); });
-        out.push({start: change.start, added: change.old.length, old: replaced});
-        var pos = {line: change.start + change.old.length - 1,
-                   ch: editEnd(hlText(lst(replaced)), hlText(lst(change.old)))};
-        updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: getLine(end-1).text.length},
-                          change.old, pos, pos);
-      }
-      updateInput = true;
-      to.push(out);
-    }
-    function undo() {unredoHelper(history.done, history.undone);}
-    function redo() {unredoHelper(history.undone, history.done);}
-
-    function updateLinesNoUndo(from, to, lines, selFrom, selTo) {
-      if (suppressEdits) return;
-      var recomputeMaxLength = false, maxLineLength = maxLine.text.length;
-      if (!options.lineWrapping)
-        doc.iter(from.line, to.line + 1, function(line) {
-          if (!line.hidden && line.text.length == maxLineLength) {recomputeMaxLength = true; return true;}
-        });
-      if (from.line != to.line || lines.length > 1) gutterDirty = true;
-
-      var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);
-      var lastHL = lst(lines);
-
-      // First adjust the line structure
-      if (from.ch == 0 && to.ch == 0 && hlText(lastHL) == "") {
-        // This is a whole-line replace. Treated specially to make
-        // sure line objects move the way they are supposed to.
-        var added = [], prevLine = null;
-        for (var i = 0, e = lines.length - 1; i < e; ++i)
-          added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
-        lastLine.update(lastLine.text, hlSpans(lastHL));
-        if (nlines) doc.remove(from.line, nlines, callbacks);
-        if (added.length) doc.insert(from.line, added);
-      } else if (firstLine == lastLine) {
-        if (lines.length == 1) {
-          firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + firstLine.text.slice(to.ch), hlSpans(lines[0]));
-        } else {
-          for (var added = [], i = 1, e = lines.length - 1; i < e; ++i)
-            added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
-          added.push(new Line(hlText(lastHL) + firstLine.text.slice(to.ch), hlSpans(lastHL)));
-          firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));
-          doc.insert(from.line + 1, added);
-        }
-      } else if (lines.length == 1) {
-        firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]) + lastLine.text.slice(to.ch), hlSpans(lines[0]));
-        doc.remove(from.line + 1, nlines, callbacks);
-      } else {
-        var added = [];
-        firstLine.update(firstLine.text.slice(0, from.ch) + hlText(lines[0]), hlSpans(lines[0]));
-        lastLine.update(hlText(lastHL) + lastLine.text.slice(to.ch), hlSpans(lastHL));
-        for (var i = 1, e = lines.length - 1; i < e; ++i)
-          added.push(new Line(hlText(lines[i]), hlSpans(lines[i])));
-        if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks);
-        doc.insert(from.line + 1, added);
-      }
-      if (options.lineWrapping) {
-        var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3);
-        doc.iter(from.line, from.line + lines.length, function(line) {
-          if (line.hidden) return;
-          var guess = Math.ceil(line.text.length / perLine) || 1;
-          if (guess != line.height) updateLineHeight(line, guess);
-        });
-      } else {
-        doc.iter(from.line, from.line + lines.length, function(line) {
-          var l = line.text;
-          if (!line.hidden && l.length > maxLineLength) {
-            maxLine = line; maxLineLength = l.length; maxLineChanged = true;
-            recomputeMaxLength = false;
-          }
-        });
-        if (recomputeMaxLength) updateMaxLine = true;
-      }
-
-      // Adjust frontier, schedule worker
-      frontier = Math.min(frontier, from.line);
-      startWorker(400);
-
-      var lendiff = lines.length - nlines - 1;
-      // Remember that these lines changed, for updating the display
-      changes.push({from: from.line, to: to.line + 1, diff: lendiff});
-      if (options.onChange) {
-        // Normalize lines to contain only strings, since that's what
-        // the change event handler expects
-        for (var i = 0; i < lines.length; ++i)
-          if (typeof lines[i] != "string") lines[i] = lines[i].text;
-        var changeObj = {from: from, to: to, text: lines};
-        if (textChanged) {
-          for (var cur = textChanged; cur.next; cur = cur.next) {}
-          cur.next = changeObj;
-        } else textChanged = changeObj;
-      }
-
-      // Update the selection
-      function updateLine(n) {return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;}
-      setSelection(clipPos(selFrom), clipPos(selTo),
-                   updateLine(sel.from.line), updateLine(sel.to.line));
-    }
-
-    function needsScrollbar() {
-      var realHeight = doc.height * textHeight() + 2 * paddingTop();
-      return realHeight * .99 > scroller.offsetHeight ? realHeight : false;
-    }
-
-    function updateVerticalScroll(scrollTop) {
-      var scrollHeight = needsScrollbar();
-      scrollbar.style.display = scrollHeight ? "block" : "none";
-      if (scrollHeight) {
-        scrollbarInner.style.height = sizer.style.minHeight = scrollHeight + "px";
-        scrollbar.style.height = scroller.clientHeight + "px";
-        if (scrollTop != null) {
-          scrollbar.scrollTop = scroller.scrollTop = scrollTop;
-          // 'Nudge' the scrollbar to work around a Webkit bug where,
-          // in some situations, we'd end up with a scrollbar that
-          // reported its scrollTop (and looked) as expected, but
-          // *behaved* as if it was still in a previous state (i.e.
-          // couldn't scroll up, even though it appeared to be at the
-          // bottom).
-          if (webkit) setTimeout(function() {
-            if (scrollbar.scrollTop != scrollTop) return;
-            scrollbar.scrollTop = scrollTop + (scrollTop ? -1 : 1);
-            scrollbar.scrollTop = scrollTop;
-          }, 0);
-        }
-      } else {
-        sizer.style.minHeight = "";
-      }
-      // Position the mover div to align with the current virtual scroll position
-      mover.style.top = displayOffset * textHeight() + "px";
-    }
-
-    function computeMaxLength() {
-      maxLine = getLine(0); maxLineChanged = true;
-      var maxLineLength = maxLine.text.length;
-      doc.iter(1, doc.size, function(line) {
-        var l = line.text;
-        if (!line.hidden && l.length > maxLineLength) {
-          maxLineLength = l.length; maxLine = line;
-        }
-      });
-      updateMaxLine = false;
-    }
-
-    function replaceRange(code, from, to) {
-      from = clipPos(from);
-      if (!to) to = from; else to = clipPos(to);
-      code = splitLines(code);
-      function adjustPos(pos) {
-        if (posLess(pos, from)) return pos;
-        if (!posLess(to, pos)) return end;
-        var line = pos.line + code.length - (to.line - from.line) - 1;
-        var ch = pos.ch;
-        if (pos.line == to.line)
-          ch += lst(code).length - (to.ch - (to.line == from.line ? from.ch : 0));
-        return {line: line, ch: ch};
+      if (!changed) return coords;
+    }
+  }
+
+  function scrollIntoView(cm, x1, y1, x2, y2) {
+    var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
+    if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
+    if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
+  }
+
+  function calculateScrollPos(cm, x1, y1, x2, y2) {
+    var display = cm.display, pt = paddingTop(display);
+    y1 += pt; y2 += pt;
+    if (y1 < 0) y1 = 0;
+    var screen = display.scroller.clientHeight - scrollerCutOff, screentop = display.scroller.scrollTop, result = {};
+    var docBottom = cm.doc.height + paddingVert(display);
+    var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;
+    if (y1 < screentop) {
+      result.scrollTop = atTop ? 0 : y1;
+    } else if (y2 > screentop + screen) {
+      var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
+      if (newTop != screentop) result.scrollTop = newTop;
+    }
+
+    var screenw = display.scroller.clientWidth - scrollerCutOff, screenleft = display.scroller.scrollLeft;
+    x1 += display.gutters.offsetWidth; x2 += display.gutters.offsetWidth;
+    var gutterw = display.gutters.offsetWidth;
+    var atLeft = x1 < gutterw + 10;
+    if (x1 < screenleft + gutterw || atLeft) {
+      if (atLeft) x1 = 0;
+      result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
+    } else if (x2 > screenw + screenleft - 3) {
+      result.scrollLeft = x2 + 10 - screenw;
+    }
+    return result;
+  }
+
+  function updateScrollPos(cm, left, top) {
+    cm.curOp.updateScrollPos = {scrollLeft: left == null ? cm.doc.scrollLeft : left,
+                                scrollTop: top == null ? cm.doc.scrollTop : top};
+  }
+
+  function addToScrollPos(cm, left, top) {
+    var pos = cm.curOp.updateScrollPos || (cm.curOp.updateScrollPos = {scrollLeft: cm.doc.scrollLeft, scrollTop: cm.doc.scrollTop});
+    var scroll = cm.display.scroller;
+    pos.scrollTop = Math.max(0, Math.min(scroll.scrollHeight - scroll.clientHeight, pos.scrollTop + top));
+    pos.scrollLeft = Math.max(0, Math.min(scroll.scrollWidth - scroll.clientWidth, pos.scrollLeft + left));
+  }
+
+  // API UTILITIES
+
+  function indentLine(cm, n, how, aggressive) {
+    var doc = cm.doc;
+    if (!how) how = "add";
+    if (how == "smart") {
+      if (!cm.doc.mode.indent) how = "prev";
+      else var state = getStateBefore(cm, n);
+    }
+
+    var tabSize = cm.options.tabSize;
+    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
+    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
+    if (how == "smart") {
+      indentation = cm.doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
+      if (indentation == Pass) {
+        if (!aggressive) return;
+        how = "prev";
       }
-      var end;
-      replaceRange1(code, from, to, function(end1) {
-        end = end1;
-        return {from: adjustPos(sel.from), to: adjustPos(sel.to)};
-      });
-      return end;
-    }
-    function replaceSelection(code, collapse) {
-      replaceRange1(splitLines(code), sel.from, sel.to, function(end) {
-        if (collapse == "end") return {from: end, to: end};
-        else if (collapse == "start") return {from: sel.from, to: sel.from};
-        else return {from: sel.from, to: end};
-      });
-    }
-    function replaceRange1(code, from, to, computeSel) {
-      var endch = code.length == 1 ? code[0].length + from.ch : lst(code).length;
-      var newSel = computeSel({line: from.line + code.length - 1, ch: endch});
-      updateLines(from, to, code, newSel.from, newSel.to);
-    }
-
-    function getRange(from, to, lineSep) {
-      var l1 = from.line, l2 = to.line;
-      if (l1 == l2) return getLine(l1).text.slice(from.ch, to.ch);
-      var code = [getLine(l1).text.slice(from.ch)];
-      doc.iter(l1 + 1, l2, function(line) { code.push(line.text); });
-      code.push(getLine(l2).text.slice(0, to.ch));
-      return code.join(lineSep || "\n");
-    }
-    function getSelection(lineSep) {
-      return getRange(sel.from, sel.to, lineSep);
-    }
-
-    function slowPoll() {
-      if (pollingFast) return;
-      poll.set(options.pollInterval, function() {
-        readInput();
-        if (focused) slowPoll();
-      });
-    }
-    function fastPoll() {
-      var missed = false;
-      pollingFast = true;
-      function p() {
-        var changed = readInput();
-        if (!changed && !missed) {missed = true; poll.set(60, p);}
-        else {pollingFast = false; slowPoll();}
-      }
-      poll.set(20, p);
-    }
-
-    // Previnput is a hack to work with IME. If we reset the textarea
-    // on every change, that breaks IME. So we look for changes
-    // compared to the previous content instead. (Modern browsers have
-    // events that indicate IME taking place, but these are not widely
-    // supported or compatible enough yet to rely on.)
-    var prevInput = "";
-    function readInput() {
-      if (!focused || hasSelection(input) || options.readOnly) return false;
-      var text = input.value;
-      if (text == prevInput) return false;
-      if (!nestedOperation) startOperation();
-      shiftSelecting = null;
-      var same = 0, l = Math.min(prevInput.length, text.length);
-      while (same < l && prevInput[same] == text[same]) ++same;
-      if (same < prevInput.length)
-        sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)};
-      else if (overwrite && posEq(sel.from, sel.to) && !pasteIncoming)
-        sel.to = {line: sel.to.line, ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))};
-      replaceSelection(text.slice(same), "end");
-      if (text.length > 1000) { input.value = prevInput = ""; }
-      else prevInput = text;
-      if (!nestedOperation) endOperation();
-      pasteIncoming = false;
+    }
+    if (how == "prev") {
+      if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
+      else indentation = 0;
+    } else if (how == "add") {
+      indentation = curSpace + cm.options.indentUnit;
+    } else if (how == "subtract") {
+      indentation = curSpace - cm.options.indentUnit;
+    }
+    indentation = Math.max(0, indentation);
+
+    var indentString = "", pos = 0;
+    if (cm.options.indentWithTabs)
+      for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
+    if (pos < indentation) indentString += spaceStr(indentation - pos);
+
+    if (indentString != curSpaceString)
+      replaceRange(cm.doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
+    line.stateAfter = null;
+  }
+
+  function changeLine(cm, handle, op) {
+    var no = handle, line = handle, doc = cm.doc;
+    if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
+    else no = lineNo(handle);
+    if (no == null) return null;
+    if (op(line, no)) regChange(cm, no, no + 1);
+    else return null;
+    return line;
+  }
+
+  function findPosH(doc, pos, dir, unit, visually) {
+    var line = pos.line, ch = pos.ch;
+    var lineObj = getLine(doc, line);
+    var possible = true;
+    function findNextLine() {
+      var l = line + dir;
+      if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
+      line = l;
+      return lineObj = getLine(doc, l);
+    }
+    function moveOnce(boundToLine) {
+      var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
+      if (next == null) {
+        if (!boundToLine && findNextLine()) {
+          if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
+          else ch = dir < 0 ? lineObj.text.length : 0;
+        } else return (possible = false);
+      } else ch = next;
       return true;
     }
-    function resetInput(user) {
-      if (!posEq(sel.from, sel.to)) {
-        prevInput = "";
-        input.value = getSelection();
-        if (focused) selectInput(input);
-      } else if (user) prevInput = input.value = "";
-    }
-
-    function focusInput() {
-      if (options.readOnly != "nocursor") input.focus();
-    }
-
-    function scrollCursorIntoView() {
-      var coords = calculateCursorCoords();
-      scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
-      if (!focused) return;
-      var box = sizer.getBoundingClientRect(), doScroll = null;
-      if (coords.y + box.top < 0) doScroll = true;
-      else if (coords.y + box.top + textHeight() > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
-      if (doScroll != null) {
-        var hidden = cursor.style.display == "none";
-        if (hidden) {
-          cursor.style.display = "";
-          cursor.style.left = coords.x + "px";
-          cursor.style.top = (coords.y - displayOffset) + "px";
+
+    if (unit == "char") moveOnce();
+    else if (unit == "column") moveOnce(true);
+    else if (unit == "word" || unit == "group") {
+      var sawType = null, group = unit == "group";
+      for (var first = true;; first = false) {
+        if (dir < 0 && !moveOnce(!first)) break;
+        var cur = lineObj.text.charAt(ch) || "\n";
+        var type = isWordChar(cur) ? "w"
+          : !group ? null
+          : /\s/.test(cur) ? null
+          : "p";
+        if (sawType && sawType != type) {
+          if (dir < 0) {dir = 1; moveOnce();}
+          break;
         }
-        cursor.scrollIntoView(doScroll);
-        if (hidden) cursor.style.display = "none";
-      }
-    }
-    function calculateCursorCoords() {
-      var cursor = localCoords(sel.inverted ? sel.from : sel.to);
-      var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x;
-      return {x: x, y: cursor.y, yBot: cursor.yBot};
-    }
-    function scrollIntoView(x1, y1, x2, y2) {
-      var scrollPos = calculateScrollPos(x1, y1, x2, y2);
-      if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft;}
-      if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scroller.scrollTop = scrollPos.scrollTop;}
-    }
-    function calculateScrollPos(x1, y1, x2, y2) {
-      var pl = paddingLeft(), pt = paddingTop();
-      y1 += pt; y2 += pt; x1 += pl; x2 += pl;
-      var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {};
-      var docBottom = needsScrollbar() || Infinity;
-      var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;
-      if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1);
-      else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen;
-
-      var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
-      var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
-      var atLeft = x1 < gutterw + pl + 10;
-      if (x1 < screenleft + gutterw || atLeft) {
-        if (atLeft) x1 = 0;
-        result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
-      } else if (x2 > screenw + screenleft - 3) {
-        result.scrollLeft = x2 + 10 - screenw;
-      }
-      return result;
-    }
-
-    function visibleLines(scrollTop) {
-      var lh = textHeight(), top = (scrollTop != null ? scrollTop : scrollbar.scrollTop) - paddingTop();
-      var fromHeight = Math.max(0, Math.floor(top / lh));
-      var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
-      return {from: lineAtHeight(doc, fromHeight),
-              to: lineAtHeight(doc, toHeight)};
-    }
-    // Uses a set of changes plus the current scroll position to
-    // determine which DOM updates have to be made, and makes the
-    // updates.
-    function updateDisplay(changes, suppressCallback, scrollTop) {
-      if (!scroller.clientWidth) {
-        showingFrom = showingTo = displayOffset = 0;
-        return;
-      }
-      // Compute the new visible window
-      // If scrollTop is specified, use that to determine which lines
-      // to render instead of the current scrollbar position.
-      var visible = visibleLines(scrollTop);
-      // Bail out if the visible area is already rendered and nothing changed.
-      if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) {
-        updateVerticalScroll(scrollTop);
-        return;
+        if (type) sawType = type;
+        if (dir > 0 && !moveOnce(!first)) break;
       }
-      var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
-      if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
-      if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);
-
-      // Create a range of theoretically intact lines, and punch holes
-      // in that using the change info.
-      var intact = changes === true ? [] :
-        computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
-      // Clip off the parts that won't be visible
-      var intactLines = 0;
-      for (var i = 0; i < intact.length; ++i) {
-        var range = intact[i];
-        if (range.from < from) {range.domStart += (from - range.from); range.from = from;}
-        if (range.to > to) range.to = to;
-        if (range.from >= range.to) intact.splice(i--, 1);
-        else intactLines += range.to - range.from;
-      }
-      if (intactLines == to - from && from == showingFrom && to == showingTo) {
-        updateVerticalScroll(scrollTop);
-        return;
-      }
-      intact.sort(function(a, b) {return a.domStart - b.domStart;});
-
-      var th = textHeight(), gutterDisplay = gutter.style.display;
-      lineDiv.style.display = "none";
-      patchDisplay(from, to, intact);
-      lineDiv.style.display = gutter.style.display = "";
-
-      var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th;
-      // This is just a bogus formula that detects when the editor is
-      // resized or the font size changes.
-      if (different) lastSizeC = scroller.clientHeight + th;
-      if (from != showingFrom || to != showingTo && options.onViewportChange)
-        setTimeout(function(){
-          if (options.onViewportChange) options.onViewportChange(instance, from, to);
-        });
-      showingFrom = from; showingTo = to;
-      displayOffset = heightAtLine(doc, from);
-      startWorker(100);
-
-      // Since this is all rather error prone, it is honoured with the
-      // only assertion in the whole file.
-      if (lineDiv.childNodes.length != showingTo - showingFrom)
-        throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
-                        " nodes=" + lineDiv.childNodes.length);
-
-      function checkHeights() {
-        var curNode = lineDiv.firstChild, heightChanged = false;
-        doc.iter(showingFrom, showingTo, function(line) {
-          // Work around bizarro IE7 bug where, sometimes, our curNode
-          // is magically replaced with a new node in the DOM, leaving
-          // us with a reference to an orphan (nextSibling-less) node.
-          if (!curNode) return;
-          if (!line.hidden) {
-            var height = Math.round(curNode.offsetHeight / th) || 1;
-            if (line.height != height) {
-              updateLineHeight(line, height);
-              gutterDirty = heightChanged = true;
-            }
-          }
-          curNode = curNode.nextSibling;
-        });
-        return heightChanged;
-      }
-
-      if (options.lineWrapping) checkHeights();
-
-      gutter.style.display = gutterDisplay;
-      if (different || gutterDirty) {
-        // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
-        updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
+    }
+    var result = skipAtomic(doc, Pos(line, ch), dir, true);
+    if (!possible) result.hitSide = true;
+    return result;
+  }
+
+  function findPosV(cm, pos, dir, unit) {
+    var doc = cm.doc, x = pos.left, y;
+    if (unit == "page") {
+      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+      y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
+    } else if (unit == "line") {
+      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
+    }
+    for (;;) {
+      var target = coordsChar(cm, x, y);
+      if (!target.outside) break;
+      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
+      y += dir * 5;
+    }
+    return target;
+  }
+
+  function findWordAt(line, pos) {
+    var start = pos.ch, end = pos.ch;
+    if (line) {
+      if (pos.after === false || end == line.length) --start; else ++end;
+      var startChar = line.charAt(start);
+      var check = isWordChar(startChar) ? isWordChar
+        : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
+        : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
+      while (start > 0 && check(line.charAt(start - 1))) --start;
+      while (end < line.length && check(line.charAt(end))) ++end;
+    }
+    return {from: Pos(pos.line, start), to: Pos(pos.line, end)};
+  }
+
+  function selectLine(cm, line) {
+    extendSelection(cm.doc, Pos(line, 0), clipPos(cm.doc, Pos(line + 1, 0)));
+  }
+
+  // PROTOTYPE
+
+  // The publicly visible API. Note that operation(null, f) means
+  // 'wrap f in an operation, performed on its `this` parameter'
+
+  CodeMirror.prototype = {
+    focus: function(){window.focus(); focusInput(this); onFocus(this); fastPoll(this);},
+
+    setOption: function(option, value) {
+      var options = this.options, old = options[option];
+      if (options[option] == value && option != "mode") return;
+      options[option] = value;
+      if (optionHandlers.hasOwnProperty(option))
+        operation(this, optionHandlers[option])(this, value, old);
+    },
+
+    getOption: function(option) {return this.options[option];},
+    getDoc: function() {return this.doc;},
+
+    addKeyMap: function(map, bottom) {
+      this.state.keyMaps[bottom ? "push" : "unshift"](map);
+    },
+    removeKeyMap: function(map) {
+      var maps = this.state.keyMaps;
+      for (var i = 0; i < maps.length; ++i)
+        if ((typeof map == "string" ? maps[i].name : maps[i]) == map) {
+          maps.splice(i, 1);
+          return true;
+        }
+    },
+
+    addOverlay: operation(null, function(spec, options) {
+      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
+      if (mode.startState) throw new Error("Overlays may not be stateful.");
+      this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
+      this.state.modeGen++;
+      regChange(this);
+    }),
+    removeOverlay: operation(null, function(spec) {
+      var overlays = this.state.overlays;
+      for (var i = 0; i < overlays.length; ++i) {
+        if (overlays[i].modeSpec == spec) {
+          overlays.splice(i, 1);
+          this.state.modeGen++;
+          regChange(this);
+          return;
+        }
       }
-      updateVerticalScroll(scrollTop);
-      updateSelection();
-      if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
-      return true;
-    }
-
-    function computeIntact(intact, changes) {
-      for (var i = 0, l = changes.length || 0; i < l; ++i) {
-        var change = changes[i], intact2 = [], diff = change.diff || 0;
-        for (var j = 0, l2 = intact.length; j < l2; ++j) {
-          var range = intact[j];
-          if (change.to <= range.from && change.diff)
-            intact2.push({from: range.from + diff, to: range.to + diff,
-                          domStart: range.domStart});
-          else if (change.to <= range.from || change.from >= range.to)
-            intact2.push(range);
-          else {
-            if (change.from > range.from)
-              intact2.push({from: range.from, to: change.from, domStart: range.domStart});
-            if (change.to < range.to)
-              intact2.push({from: change.to + diff, to: range.to + diff,
-                            domStart: range.domStart + (change.to - range.from)});
-          }
-        }
-        intact = intact2;
+    }),
+
+    indentLine: operation(null, function(n, dir, aggressive) {
+      if (typeof dir != "string") {
+        if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
+        else dir = dir ? "add" : "subtract";
       }
-      return intact;
-    }
-
-    function patchDisplay(from, to, intact) {
-      function killNode(node) {
-        var tmp = node.nextSibling;
-        node.parentNode.removeChild(node);
-        return tmp;
-      }
-      // The first pass removes the DOM nodes that aren't intact.
-      if (!intact.length) removeChildren(lineDiv);
-      else {
-        var domPos = 0, curNode = lineDiv.firstChild, n;
-        for (var i = 0; i < intact.length; ++i) {
-          var cur = intact[i];
-          while (cur.domStart > domPos) {curNode = killNode(curNode); domPos++;}
-          for (var j = 0, e = cur.to - cur.from; j < e; ++j) {curNode = curNode.nextSibling; domPos++;}
-        }
-        while (curNode) curNode = killNode(curNode);
+      if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
+    }),
+    indentSelection: operation(null, function(how) {
+      var sel = this.doc.sel;
+      if (posEq(sel.from, sel.to)) return indentLine(this, sel.from.line, how);
+      var e = sel.to.line - (sel.to.ch ? 0 : 1);
+      for (var i = sel.from.line; i <= e; ++i) indentLine(this, i, how);
+    }),
+
+    // Fetch the parser token for a given character. Useful for hacks
+    // that want to inspect the mode state (say, for completion).
+    getTokenAt: function(pos) {
+      var doc = this.doc;
+      pos = clipPos(doc, pos);
+      var state = getStateBefore(this, pos.line), mode = this.doc.mode;
+      var line = getLine(doc, pos.line);
+      var stream = new StringStream(line.text, this.options.tabSize);
+      while (stream.pos < pos.ch && !stream.eol()) {
+        stream.start = stream.pos;
+        var style = mode.token(stream, state);
       }
-      // This pass fills in the lines that actually changed.
-      var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
-      doc.iter(from, to, function(line) {
-        if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
-        if (!nextIntact || nextIntact.from > j) {
-          if (line.hidden) var lineElement = elt("pre");
-          else {
-            var lineElement = lineContent(line);
-            if (line.className) lineElement.className = line.className;
-            // Kludge to make sure the styled element lies behind the selection (by z-index)
-            if (line.bgClassName) {
-              var pre = elt("pre", "\u00a0", line.bgClassName, "position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2");
-              lineElement = elt("div", [pre, lineElement], null, "position: relative");
-            }
-          }
-          lineDiv.insertBefore(lineElement, curNode);
-        } else {
-          curNode = curNode.nextSibling;
-        }
-        ++j;
+      return {start: stream.start,
+              end: stream.pos,
+              string: stream.current(),
+              className: style || null, // Deprecated, use 'type' instead
+              type: style || null,
+              state: state};
+    },
+
+    getStateAfter: function(line) {
+      var doc = this.doc;
+      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
+      return getStateBefore(this, line + 1);
+    },
+
+    cursorCoords: function(start, mode) {
+      var pos, sel = this.doc.sel;
+      if (start == null) pos = sel.head;
+      else if (typeof start == "object") pos = clipPos(this.doc, start);
+      else pos = start ? sel.from : sel.to;
+      return cursorCoords(this, pos, mode || "page");
+    },
+
+    charCoords: function(pos, mode) {
+      return charCoords(this, clipPos(this.doc, pos), mode || "page");
+    },
+
+    coordsChar: function(coords, mode) {
+      coords = fromCoordSystem(this, coords, mode || "page");
+      return coordsChar(this, coords.left, coords.top);
+    },
+
+    defaultTextHeight: function() { return textHeight(this.display); },
+    defaultCharWidth: function() { return charWidth(this.display); },
+
+    setGutterMarker: operation(null, function(line, gutterID, value) {
+      return changeLine(this, line, function(line) {
+        var markers = line.gutterMarkers || (line.gutterMarkers = {});
+        markers[gutterID] = value;
+        if (!value && isEmpty(markers)) line.gutterMarkers = null;
+        return true;
       });
-    }
-
-    function updateGutter() {
-      if (!options.gutter && !options.lineNumbers) return;
-      var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
-      gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
-      var fragment = document.createDocumentFragment(), i = showingFrom, normalNode;
-      doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
-        if (line.hidden) {
-          fragment.appendChild(elt("pre"));
-        } else {
-          var marker = line.gutterMarker;
-          var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;
-          if (marker && marker.text)
-            text = marker.text.replace("%N%", text != null ? text : "");
-          else if (text == null)
-            text = "\u00a0";
-          var markerElement = fragment.appendChild(elt("pre", null, marker && marker.style));
-          markerElement.innerHTML = text;
-          for (var j = 1; j < line.height; ++j) {
-            markerElement.appendChild(elt("br"));
-            markerElement.appendChild(document.createTextNode("\u00a0"));
-          }
-          if (!marker) normalNode = i;
+    }),
+
+    clearGutter: operation(null, function(gutterID) {
+      var cm = this, doc = cm.doc, i = doc.first;
+      doc.iter(function(line) {
+        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
+          line.gutterMarkers[gutterID] = null;
+          regChange(cm, i, i + 1);
+          if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
         }
         ++i;
       });
-      gutter.style.display = "none";
-      removeChildrenAndAdd(gutterText, fragment);
-      // Make sure scrolling doesn't cause number gutter size to pop
-      if (normalNode != null && options.lineNumbers) {
-        var node = gutterText.childNodes[normalNode - showingFrom];
-        var minwidth = String(doc.size).length, val = eltText(node.firstChild), pad = "";
-        while (val.length + pad.length < minwidth) pad += "\u00a0";
-        if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
-      }
-      gutter.style.display = "";
-      var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
-      lineSpace.style.marginLeft = gutter.offsetWidth + "px";
-      gutterDirty = false;
-      return resized;
-    }
-    function updateSelection() {
-      var collapsed = posEq(sel.from, sel.to);
-      var fromPos = localCoords(sel.from, true);
-      var toPos = collapsed ? fromPos : localCoords(sel.to, true);
-      var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
-      var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
-      inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
-      inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
-      if (collapsed) {
-        cursor.style.top = headPos.y + "px";
-        cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
-        cursor.style.display = "";
-        selectionDiv.style.display = "none";
-      } else {
-        var sameLine = fromPos.y == toPos.y, fragment = document.createDocumentFragment();
-        var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
-        var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
-        var add = function(left, top, right, height) {
-          var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
-                                  : "right: " + right + "px";
-          fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
-                                   "px; top: " + top + "px; " + rstyle + "; height: " + height + "px"));
-        };
-        if (sel.from.ch && fromPos.y >= 0) {
-          var right = sameLine ? clientWidth - toPos.x : 0;
-          add(fromPos.x, fromPos.y, right, th);
-        }
-        var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
-        var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
-        if (middleHeight > 0.2 * th)
-          add(0, middleStart, 0, middleHeight);
-        if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
-          add(0, toPos.y, clientWidth - toPos.x, th);
-        removeChildrenAndAdd(selectionDiv, fragment);
-        cursor.style.display = "none";
-        selectionDiv.style.display = "";
-      }
-    }
-
-    function setShift(val) {
-      if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
-      else shiftSelecting = null;
-    }
-    function setSelectionUser(from, to) {
-      var sh = shiftSelecting && clipPos(shiftSelecting);
-      if (sh) {
-        if (posLess(sh, from)) from = sh;
-        else if (posLess(to, sh)) to = sh;
-      }
-      setSelection(from, to);
-      userSelChange = true;
-    }
-    // Update the selection. Last two args are only used by
-    // updateLines, since they have to be expressed in the line
-    // numbers before the update.
-    function setSelection(from, to, oldFrom, oldTo) {
-      goalColumn = null;
-      if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
-      if (posEq(sel.from, from) && posEq(sel.to, to)) return;
-      if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
-
-      // Skip over hidden lines.
-      if (from.line != oldFrom) {
-        var from1 = skipHidden(from, oldFrom, sel.from.ch);
-        // If there is no non-hidden line left, force visibility on current line
-        if (!from1) setLineHidden(from.line, false);
-        else from = from1;
-      }
-      if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);
-
-      if (posEq(from, to)) sel.inverted = false;
-      else if (posEq(from, sel.to)) sel.inverted = false;
-      else if (posEq(to, sel.from)) sel.inverted = true;
-
-      if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
-        var head = sel.inverted ? from : to;
-        if (head.line != sel.from.line && sel.from.line < doc.size) {
-          var oldLine = getLine(sel.from.line);
-          if (/^\s+$/.test(oldLine.text))
-            setTimeout(operation(function() {
-              if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
-                var no = lineNo(oldLine);
-                replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
-              }
-            }, 10));
-        }
-      }
-
-      sel.from = from; sel.to = to;
-      selectionChanged = true;
-    }
-    function skipHidden(pos, oldLine, oldCh) {
-      function getNonHidden(dir) {
-        var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
-        while (lNo != end) {
-          var line = getLine(lNo);
-          if (!line.hidden) {
-            var ch = pos.ch;
-            if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
-            return {line: lNo, ch: ch};
-          }
-          lNo += dir;
-        }
-      }
-      var line = getLine(pos.line);
-      var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
-      if (!line.hidden) return pos;
-      if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
-      else return getNonHidden(-1) || getNonHidden(1);
-    }
-    function setCursor(line, ch, user) {
-      var pos = clipPos({line: line, ch: ch || 0});
-      (user ? setSelectionUser : setSelection)(pos, pos);
-    }
-
-    function clipLine(n) {return Math.max(0, Math.min(n, doc.size-1));}
-    function clipPos(pos) {
-      if (pos.line < 0) return {line: 0, ch: 0};
-      if (pos.line >= doc.size) return {line: doc.size-1, ch: getLine(doc.size-1).text.length};
-      var ch = pos.ch, linelen = getLine(pos.line).text.length;
-      if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
-      else if (ch < 0) return {line: pos.line, ch: 0};
-      else return pos;
-    }
-
-    function findPosH(dir, unit) {
-      var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
-      var lineObj = getLine(line);
-      function findNextLine() {
-        for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
-          var lo = getLine(l);
-          if (!lo.hidden) { line = l; lineObj = lo; return true; }
-        }
-      }
-      function moveOnce(boundToLine) {
-        if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
-          if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
-          else return false;
-        } else ch += dir;
+    }),
+
+    addLineClass: operation(null, function(handle, where, cls) {
+      return changeLine(this, handle, function(line) {
+        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
+        if (!line[prop]) line[prop] = cls;
+        else if (new RegExp("\\b" + cls + "\\b").test(line[prop])) return false;
+        else line[prop] += " " + cls;
         return true;
-      }
-      if (unit == "char") moveOnce();
-      else if (unit == "column") moveOnce(true);
-      else if (unit == "word") {
-        var sawWord = false;
-        for (;;) {
-          if (dir < 0) if (!moveOnce()) break;
-          if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
-          else if (sawWord) {if (dir < 0) {dir = 1; moveOnce();} break;}
-          if (dir > 0) if (!moveOnce()) break;
+      });
+    }),
+
+    removeLineClass: operation(null, function(handle, where, cls) {
+      return changeLine(this, handle, function(line) {
+        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
+        var cur = line[prop];
+        if (!cur) return false;
+        else if (cls == null) line[prop] = null;
+        else {
+          var upd = cur.replace(new RegExp("^" + cls + "\\b\\s*|\\s*\\b" + cls + "\\b"), "");
+          if (upd == cur) return false;
+          line[prop] = upd || null;
         }
-      }
-      return {line: line, ch: ch};
-    }
-    function moveH(dir, unit) {
-      var pos = dir < 0 ? sel.from : sel.to;
-      if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
-      setCursor(pos.line, pos.ch, true);
-    }
-    function deleteH(dir, unit) {
-      if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
-      else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
-      else replaceRange("", sel.from, findPosH(dir, unit));
-      userSelChange = true;
-    }
-    function moveV(dir, unit) {
-      var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
-      if (goalColumn != null) pos.x = goalColumn;
-      if (unit == "page") {
-        var screen = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
-        var target = coordsChar(pos.x, pos.y + screen * dir);
-      } else if (unit == "line") {
-        var th = textHeight();
-        var target = coordsChar(pos.x, pos.y + .5 * th + dir * th);
-      }
-      if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;
-      setCursor(target.line, target.ch, true);
-      goalColumn = pos.x;
-    }
-
-    function findWordAt(pos) {
-      var line = getLine(pos.line).text;
-      var start = pos.ch, end = pos.ch;
-      if (line) {
-        if (pos.after === false || end == line.length) --start; else ++end;
-        var startChar = line.charAt(start);
-        var check = isWordChar(startChar) ? isWordChar :
-                    /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);} :
-                    function(ch) {return !/\s/.test(ch) && isWordChar(ch);};
-        while (start > 0 && check(line.charAt(start - 1))) --start;
-        while (end < line.length && check(line.charAt(end))) ++end;
-      }
-      return {from: {line: pos.line, ch: start}, to: {line: pos.line, ch: end}};
-    }
-    function selectLine(line) {
-      setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
-    }
-    function indentSelected(mode) {
-      if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
-      var e = sel.to.line - (sel.to.ch ? 0 : 1);
-      for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
-    }
-
-    function indentLine(n, how) {
-      if (!how) how = "add";
-      if (how == "smart") {
-        if (!mode.indent) how = "prev";
-        else var state = getStateBefore(n);
-      }
-
-      var line = getLine(n), curSpace = line.indentation(options.tabSize),
-          curSpaceString = line.text.match(/^\s*/)[0], indentation;
-      if (how == "smart") {
-        indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
-        if (indentation == Pass) how = "prev";
-      }
-      if (how == "prev") {
-        if (n) indentation = getLine(n-1).indentation(options.tabSize);
-        else indentation = 0;
-      }
-      else if (how == "add") indentation = curSpace + options.indentUnit;
-      else if (how == "subtract") indentation = curSpace - options.indentUnit;
-      indentation = Math.max(0, indentation);
-      var diff = indentation - curSpace;
-
-      var indentString = "", pos = 0;
-      if (options.indentWithTabs)
-        for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}
-      if (pos < indentation) indentString += spaceStr(indentation - pos);
-
-      if (indentString != curSpaceString)
-        replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
-      line.stateAfter = null;
-    }
-
-    function loadMode() {
-      mode = CodeMirror.getMode(options, options.mode);
-      doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
-      frontier = 0;
-      startWorker(100);
-    }
-    function gutterChanged() {
-      var visible = options.gutter || options.lineNumbers;
-      gutter.style.display = visible ? "" : "none";
-      if (visible) gutterDirty = true;
-      else lineDiv.parentNode.style.marginLeft = 0;
-    }
-    function wrappingChanged(from, to) {
-      if (options.lineWrapping) {
-        wrapper.className += " CodeMirror-wrap";
-        var perLine = scroller.clientWidth / charWidth() - 3;
-        doc.iter(0, doc.size, function(line) {
-          if (line.hidden) return;
-          var guess = Math.ceil(line.text.length / perLine) || 1;
-          if (guess != 1) updateLineHeight(line, guess);
-        });
-        lineSpace.style.minWidth = widthForcer.style.left = "";
-      } else {
-        wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
-        computeMaxLength();
-        doc.iter(0, doc.size, function(line) {
-          if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
-        });
-      }
-      changes.push({from: 0, to: doc.size});
-    }
-    function themeChanged() {
-      scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
-        options.theme.replace(/(^|\s)\s*/g, " cm-s-");
-    }
-    function keyMapChanged() {
-      var style = keyMap[options.keyMap].style;
-      wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
-        (style ? " cm-keymap-" + style : "");
-    }
-
-    function TextMarker(type, style) { this.lines = []; this.type = type; if (style) this.style = style; }
-    TextMarker.prototype.clear = operation(function() {
-      var min, max;
-      for (var i = 0; i < this.lines.length; ++i) {
-        var line = this.lines[i];
-        var span = getMarkedSpanFor(line.markedSpans, this);
-        if (span.from != null) min = lineNo(line);
-        if (span.to != null) max = lineNo(line);
-        line.markedSpans = removeMarkedSpan(line.markedSpans, span);
-      }
-      if (min != null) changes.push({from: min, to: max + 1});
-      this.lines.length = 0;
-      this.explicitlyCleared = true;
-    });
-    TextMarker.prototype.find = function() {
-      var from, to;
-      for (var i = 0; i < this.lines.length; ++i) {
-        var line = this.lines[i];
-        var span = getMarkedSpanFor(line.markedSpans, this);
-        if (span.from != null || span.to != null) {
-          var found = lineNo(line);
-          if (span.from != null) from = {line: found, ch: span.from};
-          if (span.to != null) to = {line: found, ch: span.to};
-        }
-      }
-      if (this.type == "bookmark") return from;
-      return from && {from: from, to: to};
-    };
-
-    function markText(from, to, className, options) {
-      from = clipPos(from); to = clipPos(to);
-      var marker = new TextMarker("range", className);
-      if (options) for (var opt in options) if (options.hasOwnProperty(opt))
-        marker[opt] = options[opt];
-      var curLine = from.line;
-      doc.iter(curLine, to.line + 1, function(line) {
-        var span = {from: curLine == from.line ? from.ch : null,
-                    to: curLine == to.line ? to.ch : null,
-                    marker: marker};
-        line.markedSpans = (line.markedSpans || []).concat([span]);
-        marker.lines.push(line);
-        ++curLine;
+        return true;
       });
-      changes.push({from: from.line, to: to.line + 1});
-      return marker;
-    }
-
-    function setBookmark(pos) {
-      pos = clipPos(pos);
-      var marker = new TextMarker("bookmark"), line = getLine(pos.line);
-      history.addChange(pos.line, 1, [newHL(line.text, line.markedSpans)], true);
-      var span = {from: pos.ch, to: pos.ch, marker: marker};
-      line.markedSpans = (line.markedSpans || []).concat([span]);
-      marker.lines.push(line);
-      return marker;
-    }
-
-    function findMarksAt(pos) {
-      pos = clipPos(pos);
-      var markers = [], spans = getLine(pos.line).markedSpans;
-      if (spans) for (var i = 0; i < spans.length; ++i) {
-        var span = spans[i];
-        if ((span.from == null || span.from <= pos.ch) &&
-            (span.to == null || span.to >= pos.ch))
-          markers.push(span.marker);
-      }
-      return markers;
-    }
-
-    function addGutterMarker(line, text, className) {
-      if (typeof line == "number") line = getLine(clipLine(line));
-      line.gutterMarker = {text: text, style: className};
-      gutterDirty = true;
-      return line;
-    }
-    function removeGutterMarker(line) {
-      if (typeof line == "number") line = getLine(clipLine(line));
-      line.gutterMarker = null;
-      gutterDirty = true;
-    }
-
-    function changeLine(handle, op) {
-      var no = handle, line = handle;
-      if (typeof handle == "number") line = getLine(clipLine(handle));
-      else no = lineNo(handle);
-      if (no == null) return null;
-      if (op(line, no)) changes.push({from: no, to: no + 1});
-      else return null;
-      return line;
-    }
-    function setLineClass(handle, className, bgClassName) {
-      return changeLine(handle, function(line) {
-        if (line.className != className || line.bgClassName != bgClassName) {
-          line.className = className;
-          line.bgClassName = bgClassName;
-          return true;
-        }
-      });
-    }
-    function setLineHidden(handle, hidden) {
-      return changeLine(handle, function(line, no) {
-        if (line.hidden != hidden) {
-          line.hidden = hidden;
-          if (!options.lineWrapping) {
-            if (hidden && line.text.length == maxLine.text.length) {
-              updateMaxLine = true;
-            } else if (!hidden && line.text.length > maxLine.text.length) {
-              maxLine = line; updateMaxLine = false;
-            }
-          }
-          updateLineHeight(line, hidden ? 0 : 1);
-          var fline = sel.from.line, tline = sel.to.line;
-          if (hidden && (fline == no || tline == no)) {
-            var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
-            var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
-            // Can't hide the last visible line, we'd have no place to put the cursor
-            if (!to) return;
-            setSelection(from, to);
-          }
-          return (gutterDirty = true);
-        }
-      });
-    }
-
-    function lineInfo(line) {
+    }),
+
+    addLineWidget: operation(null, function(handle, node, options) {
+      return addLineWidget(this, handle, node, options);
+    }),
+
+    removeLineWidget: function(widget) { widget.clear(); },
+
+    lineInfo: function(line) {
       if (typeof line == "number") {
-        if (!isLine(line)) return null;
+        if (!isLine(this.doc, line)) return null;
         var n = line;
-        line = getLine(line);
+        line = getLine(this.doc, line);
         if (!line) return null;
       } else {
         var n = lineNo(line);
         if (n == null) return null;
       }
-      var marker = line.gutterMarker;
-      return {line: n, handle: line, text: line.text, markerText: marker && marker.text,
-              markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
-    }
-
-    function measureLine(line, ch) {
-      if (ch == 0) return {top: 0, left: 0};
-      var pre = lineContent(line, ch);
-      removeChildrenAndAdd(measure, pre);
-      var anchor = pre.anchor;
-      var top = anchor.offsetTop, left = anchor.offsetLeft;
-      // Older IEs report zero offsets for spans directly after a wrap
-      if (ie && top == 0 && left == 0) {
-        var backup = elt("span", "x");
-        anchor.parentNode.insertBefore(backup, anchor.nextSibling);
-        top = backup.offsetTop;
-      }
-      return {top: top, left: left};
-    }
-    function localCoords(pos, inLineWrap) {
-      var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
-      if (pos.ch == 0) x = 0;
-      else {
-        var sp = measureLine(getLine(pos.line), pos.ch);
-        x = sp.left;
-        if (options.lineWrapping) y += Math.max(0, sp.top);
+      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
+              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
+              widgets: line.widgets};
+    },
+
+    getViewport: function() { return {from: this.display.showingFrom, to: this.display.showingTo};},
+
+    addWidget: function(pos, node, scroll, vert, horiz) {
+      var display = this.display;
+      pos = cursorCoords(this, clipPos(this.doc, pos));
+      var top = pos.bottom, left = pos.left;
+      node.style.position = "absolute";
+      display.sizer.appendChild(node);
+      if (vert == "over") {
+        top = pos.top;
+      } else if (vert == "above" || vert == "near") {
+        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
+        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
+        // Default to positioning above (if specified and possible); otherwise default to positioning below
+        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
+          top = pos.top - node.offsetHeight;
+        else if (pos.bottom + node.offsetHeight <= vspace)
+          top = pos.bottom;
+        if (left + node.offsetWidth > hspace)
+          left = hspace - node.offsetWidth;
       }
-      return {x: x, y: y, yBot: y + lh};
-    }
-    // Coords must be lineSpace-local
-    function coordsChar(x, y) {
-      var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
-      if (heightPos < 0) return {line: 0, ch: 0};
-      var lineNo = lineAtHeight(doc, heightPos);
-      if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
-      var lineObj = getLine(lineNo), text = lineObj.text;
-      var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
-      if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
-      var wrongLine = false;
-      function getX(len) {
-        var sp = measureLine(lineObj, len);
-        if (tw) {
-          var off = Math.round(sp.top / th);
-          wrongLine = off != innerOff;
-          return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
-        }
-        return sp.left;
-      }
-      var from = 0, fromX = 0, to = text.length, toX;
-      // Guess a suitable upper bound for our search.
-      var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
-      for (;;) {
-        var estX = getX(estimated);
-        if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
-        else {toX = estX; to = estimated; break;}
-      }
-      if (x > toX) return {line: lineNo, ch: to};
-      // Try to guess a suitable lower bound as well.
-      estimated = Math.floor(to * 0.8); estX = getX(estimated);
-      if (estX < x) {from = estimated; fromX = estX;}
-      // Do a binary search between these bounds.
-      for (;;) {
-        if (to - from <= 1) {
-          var after = x - fromX < toX - x;
-          return {line: lineNo, ch: after ? from : to, after: after};
-        }
-        var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
-        if (middleX > x) {to = middle; toX = middleX; if (wrongLine) toX += 1000; }
-        else {from = middle; fromX = middleX;}
+      node.style.top = (top + paddingTop(display)) + "px";
+      node.style.left = node.style.right = "";
+      if (horiz == "right") {
+        left = display.sizer.clientWidth - node.offsetWidth;
+        node.style.right = "0px";
+      } else {
+        if (horiz == "left") left = 0;
+        else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
+        node.style.left = left + "px";
       }
-    }
-    function pageCoords(pos) {
-      var local = localCoords(pos, true), off = eltOffset(lineSpace);
-      return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
-    }
-
-    var cachedHeight, cachedHeightFor, measurePre;
-    function textHeight() {
-      if (measurePre == null) {
-        measurePre = elt("pre");
-        for (var i = 0; i < 49; ++i) {
-          measurePre.appendChild(document.createTextNode("x"));
-          measurePre.appendChild(elt("br"));
-        }
-        measurePre.appendChild(document.createTextNode("x"));
+      if (scroll)
+        scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
+    },
+
+    triggerOnKeyDown: operation(null, onKeyDown),
+
+    execCommand: function(cmd) {return commands[cmd](this);},
+
+    findPosH: function(from, amount, unit, visually) {
+      var dir = 1;
+      if (amount < 0) { dir = -1; amount = -amount; }
+      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
+        cur = findPosH(this.doc, cur, dir, unit, visually);
+        if (cur.hitSide) break;
       }
-      var offsetHeight = lineDiv.clientHeight;
-      if (offsetHeight == cachedHeightFor) return cachedHeight;
-      cachedHeightFor = offsetHeight;
-      removeChildrenAndAdd(measure, measurePre.cloneNode(true));
-      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
-      removeChildren(measure);
-      return cachedHeight;
-    }
-    var cachedWidth, cachedWidthFor = 0;
-    function charWidth() {
-      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
-      cachedWidthFor = scroller.clientWidth;
-      var anchor = elt("span", "x");
-      var pre = elt("pre", [anchor]);
-      removeChildrenAndAdd(measure, pre);
-      return (cachedWidth = anchor.offsetWidth || 10);
-    }
-    function paddingTop() {return lineSpace.offsetTop;}
-    function paddingLeft() {return lineSpace.offsetLeft;}
-
-    function posFromMouse(e, liberal) {
-      var offW = eltOffset(scroller, true), x, y;
-      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
-      try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
-      // This is a mess of a heuristic to try and determine whether a
-      // scroll-bar was clicked or not, and to return null if one was
-      // (and !liberal).
-      if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
-        return null;
-      var offL = eltOffset(lineSpace, true);
-      return coordsChar(x - offL.left, y - offL.top);
-    }
-    var detectingSelectAll;
-    function onContextMenu(e) {
-      var pos = posFromMouse(e), scrollPos = scrollbar.scrollTop;
-      if (!pos || opera) return; // Opera is difficult.
-      if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
-        operation(setCursor)(pos.line, pos.ch);
-
-      var oldCSS = input.style.cssText;
-      inputDiv.style.position = "absolute";
-      input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
-        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
-        "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
-      focusInput();
-      resetInput(true);
-      // Adds "Select all" to context menu in FF
-      if (posEq(sel.from, sel.to)) input.value = prevInput = " ";
-
-      function rehide() {
-        inputDiv.style.position = "relative";
-        input.style.cssText = oldCSS;
-        if (ie_lt9) scrollbar.scrollTop = scrollPos;
-        slowPoll();
-
-        // Try to detect the user choosing select-all 
-        if (input.selectionStart != null) {
-          clearTimeout(detectingSelectAll);
-          var extval = input.value = " " + (posEq(sel.from, sel.to) ? "" : input.value), i = 0;
-          prevInput = " ";
-          input.selectionStart = 1; input.selectionEnd = extval.length;
-          detectingSelectAll = setTimeout(function poll(){
-            if (prevInput == " " && input.selectionStart == 0)
-              operation(commands.selectAll)(instance);
-            else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
-            else resetInput();
-          }, 200);
-        }
-      }
-
-      if (gecko) {
-        e_stop(e);
-        var mouseup = connect(window, "mouseup", function() {
-          mouseup();
-          setTimeout(rehide, 20);
-        }, true);
-      } else {
-        setTimeout(rehide, 50);
+      return cur;
+    },
+
+    moveH: operation(null, function(dir, unit) {
+      var sel = this.doc.sel, pos;
+      if (sel.shift || sel.extend || posEq(sel.from, sel.to))
+        pos = findPosH(this.doc, sel.head, dir, unit, this.options.rtlMoveVisually);
+      else
+        pos = dir < 0 ? sel.from : sel.to;
+      extendSelection(this.doc, pos, pos, dir);
+    }),
+
+    deleteH: operation(null, function(dir, unit) {
+      var sel = this.doc.sel;
+      if (!posEq(sel.from, sel.to)) replaceRange(this.doc, "", sel.from, sel.to, "+delete");
+      else replaceRange(this.doc, "", sel.from, findPosH(this.doc, sel.head, dir, unit, false), "+delete");
+      this.curOp.userSelChange = true;
+    }),
+
+    findPosV: function(from, amount, unit, goalColumn) {
+      var dir = 1, x = goalColumn;
+      if (amount < 0) { dir = -1; amount = -amount; }
+      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
+        var coords = cursorCoords(this, cur, "div");
+        if (x == null) x = coords.left;
+        else coords.left = x;
+        cur = findPosV(this, coords, dir, unit);
+        if (cur.hitSide) break;
       }
-    }
-
-    // Cursor-blinking
-    function restartBlink() {
-      clearInterval(blinker);
-      var on = true;
-      cursor.style.visibility = "";
-      blinker = setInterval(function() {
-        cursor.style.visibility = (on = !on) ? "" : "hidden";
-      }, options.cursorBlinkRate);
-    }
-
-    var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
-    function matchBrackets(autoclear) {
-      var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
-      var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
-      if (!match) return;
-      var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
-      for (var off = pos + 1, i = 0, e = st.length; i < e; i+=2)
-        if ((off -= st[i].length) <= 0) {var style = st[i+1]; break;}
-
-      var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
-      function scan(line, from, to) {
-        if (!line.text) return;
-        var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
-        for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2*d) {
-          var text = st[i];
-          if (st[i+1] != style) {pos += d * text.length; continue;}
-          for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos+=d) {
-            if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
-              var match = matching[cur];
-              if (match.charAt(1) == ">" == forward) stack.push(cur);
-              else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
-              else if (!stack.length) return {pos: pos, match: true};
-            }
-          }
-        }
-      }
-      for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i+=d) {
-        var line = getLine(i), first = i == head.line;
-        var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
-        if (found) break;
-      }
-      if (!found) found = {pos: null, match: false};
-      var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
-      var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos+1}, style),
-          two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
-      var clear = operation(function(){one.clear(); two && two.clear();});
-      if (autoclear) setTimeout(clear, 800);
-      else bracketHighlighted = clear;
-    }
-
-    // Finds the line to start with when starting a parse. Tries to
-    // find a line with a stateAfter, so that it can start with a
-    // valid state. If that fails, it returns the line with the
-    // smallest indentation, which tends to need the least context to
-    // parse correctly.
-    function findStartLine(n) {
-      var minindent, minline;
-      for (var search = n, lim = n - 40; search > lim; --search) {
-        if (search == 0) return 0;
-        var line = getLine(search-1);
-        if (line.stateAfter) return search;
-        var indented = line.indentation(options.tabSize);
-        if (minline == null || minindent > indented) {
-          minline = search - 1;
-          minindent = indented;
-        }
+      return cur;
+    },
+
+    moveV: operation(null, function(dir, unit) {
+      var sel = this.doc.sel;
+      var pos = cursorCoords(this, sel.head, "div");
+      if (sel.goalColumn != null) pos.left = sel.goalColumn;
+      var target = findPosV(this, pos, dir, unit);
+
+      if (unit == "page") addToScrollPos(this, 0, charCoords(this, target, "div").top - pos.top);
+      extendSelection(this.doc, target, target, dir);
+      sel.goalColumn = pos.left;
+    }),
+
+    toggleOverwrite: function() {
+      if (this.state.overwrite = !this.state.overwrite)
+        this.display.cursor.className += " CodeMirror-overwrite";
+      else
+        this.display.cursor.className = this.display.cursor.className.replace(" CodeMirror-overwrite", "");
+    },
+    hasFocus: function() { return this.state.focused; },
+
+    scrollTo: operation(null, function(x, y) {
+      updateScrollPos(this, x, y);
+    }),
+    getScrollInfo: function() {
+      var scroller = this.display.scroller, co = scrollerCutOff;
+      return {left: scroller.scrollLeft, top: scroller.scrollTop,
+              height: scroller.scrollHeight - co, width: scroller.scrollWidth - co,
+              clientHeight: scroller.clientHeight - co, clientWidth: scroller.clientWidth - co};
+    },
+
+    scrollIntoView: operation(null, function(pos, margin) {
+      if (typeof pos == "number") pos = Pos(pos, 0);
+      if (!margin) margin = 0;
+      var coords = pos;
+
+      if (!pos || pos.line != null) {
+        this.curOp.scrollToPos = pos ? clipPos(this.doc, pos) : this.doc.sel.head;
+        this.curOp.scrollToPosMargin = margin;
+        coords = cursorCoords(this, this.curOp.scrollToPos);
       }
-      return minline;
-    }
-    function getStateBefore(n) {
-      var pos = findStartLine(n), state = pos && getLine(pos-1).stateAfter;
-      if (!state) state = startState(mode);
-      else state = copyState(mode, state);
-      doc.iter(pos, n, function(line) {
-        line.process(mode, state, options.tabSize);
-        line.stateAfter = (pos == n - 1 || pos % 5 == 0) ? copyState(mode, state) : null;
-      });
-      return state;
-    }
-    function highlightWorker() {
-      if (frontier >= showingTo) return;
-      var end = +new Date + options.workTime, state = copyState(mode, getStateBefore(frontier));
-      var startFrontier = frontier;
-      doc.iter(frontier, showingTo, function(line) {
-        if (frontier >= showingFrom) { // Visible
-          line.highlight(mode, state, options.tabSize);
-          line.stateAfter = copyState(mode, state);
-        } else {
-          line.process(mode, state, options.tabSize);
-          line.stateAfter = frontier % 5 == 0 ? copyState(mode, state) : null;
-        }
-        ++frontier;
-        if (+new Date > end) {
-          startWorker(options.workDelay);
-          return true;
-        }
-      });
-      if (showingTo > startFrontier && frontier >= showingFrom)
-        operation(function() {changes.push({from: startFrontier, to: frontier});})();
-    }
-    function startWorker(time) {
-      if (frontier < showingTo)
-        highlight.set(time, highlightWorker);
-    }
-
-    // Operations are used to wrap changes in such a way that each
-    // change won't have to update the cursor and display (which would
-    // be awkward, slow, and error-prone), but instead updates are
-    // batched and then all combined and executed at once.
-    function startOperation() {
-      updateInput = userSelChange = textChanged = null;
-      changes = []; selectionChanged = false; callbacks = [];
-    }
-    function endOperation() {
-      if (updateMaxLine) computeMaxLength();
-      if (maxLineChanged && !options.lineWrapping) {
-        var cursorWidth = widthForcer.offsetWidth, left = measureLine(maxLine, maxLine.text.length).left;
-        if (!ie_lt8) {
-          widthForcer.style.left = left + "px";
-          lineSpace.style.minWidth = (left + cursorWidth) + "px";
-        }
-        maxLineChanged = false;
+      var sPos = calculateScrollPos(this, coords.left, coords.top - margin, coords.right, coords.bottom + margin);
+      updateScrollPos(this, sPos.scrollLeft, sPos.scrollTop);
+    }),
+
+    setSize: function(width, height) {
+      function interpret(val) {
+        return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
       }
-      var newScrollPos, updated;
-      if (selectionChanged) {
-        var coords = calculateCursorCoords();
-        newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);
-      }
-      if (changes.length || newScrollPos && newScrollPos.scrollTop != null)
-        updated = updateDisplay(changes, true, newScrollPos && newScrollPos.scrollTop);
-      if (!updated) {
-        if (selectionChanged) updateSelection();
-        if (gutterDirty) updateGutter();
-      }
-      if (newScrollPos) scrollCursorIntoView();
-      if (selectionChanged) restartBlink();
-
-      if (focused && (updateInput === true || (updateInput !== false && selectionChanged)))
-        resetInput(userSelChange);
-
-      if (selectionChanged && options.matchBrackets)
-        setTimeout(operation(function() {
-          if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
-          if (posEq(sel.from, sel.to)) matchBrackets(false);
-        }), 20);
-      var sc = selectionChanged, cbs = callbacks; // these can be reset by callbacks
-      if (textChanged && options.onChange && instance)
-        options.onChange(instance, textChanged);
-      if (sc && options.onCursorActivity)
-        options.onCursorActivity(instance);
-      for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
-      if (updated && options.onUpdate) options.onUpdate(instance);
-    }
-    var nestedOperation = 0;
-    function operation(f) {
-      return function() {
-        if (!nestedOperation++) startOperation();
-        try {var result = f.apply(this, arguments);}
-        finally {if (!--nestedOperation) endOperation();}
-        return result;
-      };
-    }
-
-    function compoundChange(f) {
-      history.startCompound();
-      try { return f(); } finally { history.endCompound(); }
-    }
-
-    for (var ext in extensions)
-      if (extensions.propertyIsEnumerable(ext) &&
-          !instance.propertyIsEnumerable(ext))
-        instance[ext] = extensions[ext];
-    for (var i = 0; i < initHooks.length; ++i) initHooks[i](instance);
-    return instance;
-  } // (end of function CodeMirror)
+      if (width != null) this.display.wrapper.style.width = interpret(width);
+      if (height != null) this.display.wrapper.style.height = interpret(height);
+      this.refresh();
+    },
+
+    on: function(type, f) {on(this, type, f);},
+    off: function(type, f) {off(this, type, f);},
+
+    operation: function(f){return runInOp(this, f);},
+
+    refresh: operation(null, function() {
+      clearCaches(this);
+      updateScrollPos(this, this.doc.scrollLeft, this.doc.scrollTop);
+      regChange(this);
+    }),
+
+    swapDoc: operation(null, function(doc) {
+      var old = this.doc;
+      old.cm = null;
+      attachDoc(this, doc);
+      clearCaches(this);
+      resetInput(this, true);
+      updateScrollPos(this, doc.scrollLeft, doc.scrollTop);
+      return old;
+    }),
+
+    getInputField: function(){return this.display.input;},
+    getWrapperElement: function(){return this.display.wrapper;},
+    getScrollerElement: function(){return this.display.scroller;},
+    getGutterElement: function(){return this.display.gutters;}
+  };
+
+  // OPTION DEFAULTS
+
+  var optionHandlers = CodeMirror.optionHandlers = {};
 
   // The default configuration options.
-  CodeMirror.defaults = {
-    value: "",
-    mode: null,
-    theme: "default",
-    indentUnit: 2,
-    indentWithTabs: false,
-    smartIndent: true,
-    tabSize: 4,
-    keyMap: "default",
-    extraKeys: null,
-    electricChars: true,
-    autoClearEmptyLines: false,
-    onKeyEvent: null,
-    onDragEvent: null,
-    lineWrapping: false,
-    lineNumbers: false,
-    gutter: false,
-    fixedGutter: false,
-    firstLineNumber: 1,
-    readOnly: false,
-    dragDrop: true,
-    onChange: null,
-    onCursorActivity: null,
-    onViewportChange: null,
-    onGutterClick: null,
-    onUpdate: null,
-    onFocus: null, onBlur: null, onScroll: null,
-    matchBrackets: false,
-    cursorBlinkRate: 530,
-    workTime: 100,
-    workDelay: 200,
-    pollInterval: 100,
-    undoDepth: 40,
-    tabindex: null,
-    autofocus: null,
-    lineNumberFormatter: function(integer) { return integer; }
-  };
-
-  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
-  var mac = ios || /Mac/.test(navigator.platform);
-  var win = /Win/.test(navigator.platform);
+  var defaults = CodeMirror.defaults = {};
+
+  function option(name, deflt, handle, notOnInit) {
+    CodeMirror.defaults[name] = deflt;
+    if (handle) optionHandlers[name] =
+      notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
+  }
+
+  var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
+
+  // These two are, on init, called from the constructor because they
+  // have to be initialized before the editor can start at all.
+  option("value", "", function(cm, val) {
+    cm.setValue(val);
+  }, true);
+  option("mode", null, function(cm, val) {
+    cm.doc.modeOption = val;
+    loadMode(cm);
+  }, true);
+
+  option("indentUnit", 2, loadMode, true);
+  option("indentWithTabs", false);
+  option("smartIndent", true);
+  option("tabSize", 4, function(cm) {
+    loadMode(cm);
+    clearCaches(cm);
+    regChange(cm);
+  }, true);
+  option("electricChars", true);
+  option("rtlMoveVisually", !windows);
+
+  option("theme", "default", function(cm) {
+    themeChanged(cm);
+    guttersChanged(cm);
+  }, true);
+  option("keyMap", "default", keyMapChanged);
+  option("extraKeys", null);
+
+  option("onKeyEvent", null);
+  option("onDragEvent", null);
+
+  option("lineWrapping", false, wrappingChanged, true);
+  option("gutters", [], function(cm) {
+    setGuttersForLineNumbers(cm.options);
+    guttersChanged(cm);
+  }, true);
+  option("fixedGutter", true, function(cm, val) {
+    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
+    cm.refresh();
+  }, true);
+  option("lineNumbers", false, function(cm) {
+    setGuttersForLineNumbers(cm.options);
+    guttersChanged(cm);
+  }, true);
+  option("firstLineNumber", 1, guttersChanged, true);
+  option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
+  option("showCursorWhenSelecting", false, updateSelection, true);
+
+  option("readOnly", false, function(cm, val) {
+    if (val == "nocursor") {onBlur(cm); cm.display.input.blur();}
+    else if (!val) resetInput(cm, true);
+  });
+  option("dragDrop", true);
+
+  option("cursorBlinkRate", 530);
+  option("cursorHeight", 1);
+  option("workTime", 100);
+  option("workDelay", 100);
+  option("flattenSpans", true);
+  option("pollInterval", 100);
+  option("undoDepth", 40, function(cm, val){cm.doc.history.undoDepth = val;});
+  option("historyEventDelay", 500);
+  option("viewportMargin", 10, function(cm){cm.refresh();}, true);
+  option("maxHighlightLength", 10000, function(cm){loadMode(cm); cm.refresh();}, true);
+  option("moveInputWithCursor", true, function(cm, val) {
+    if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
+  });
+
+  option("tabindex", null, function(cm, val) {
+    cm.display.input.tabIndex = val || "";
+  });
+  option("autofocus", null);
+
+  // MODE DEFINITION AND QUERYING
 
   // Known modes, by name and by MIME
   var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
+
   CodeMirror.defineMode = function(name, mode) {
     if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
     if (arguments.length > 2) {
@@ -2042,9 +3157,11 @@
     }
     modes[name] = mode;
   };
+
   CodeMirror.defineMIME = function(mime, spec) {
     mimeModes[mime] = spec;
   };
+
   CodeMirror.resolveMode = function(spec) {
     if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
       spec = mimeModes[spec];
@@ -2053,228 +3170,49 @@
     if (typeof spec == "string") return {name: spec};
     else return spec || {name: "null"};
   };
+
   CodeMirror.getMode = function(options, spec) {
-    var spec = CodeMirror.resolveMode(spec);
+    spec = CodeMirror.resolveMode(spec);
     var mfactory = modes[spec.name];
     if (!mfactory) return CodeMirror.getMode(options, "text/plain");
     var modeObj = mfactory(options, spec);
     if (modeExtensions.hasOwnProperty(spec.name)) {
       var exts = modeExtensions[spec.name];
-      for (var prop in exts) if (exts.hasOwnProperty(prop)) modeObj[prop] = exts[prop];
+      for (var prop in exts) {
+        if (!exts.hasOwnProperty(prop)) continue;
+        if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
+        modeObj[prop] = exts[prop];
+      }
     }
     modeObj.name = spec.name;
     return modeObj;
   };
-  CodeMirror.listModes = function() {
-    var list = [];
-    for (var m in modes)
-      if (modes.propertyIsEnumerable(m)) list.push(m);
-    return list;
-  };
-  CodeMirror.listMIMEs = function() {
-    var list = [];
-    for (var m in mimeModes)
-      if (mimeModes.propertyIsEnumerable(m)) list.push({mime: m, mode: mimeModes[m]});
-    return list;
-  };
-
-  var extensions = CodeMirror.extensions = {};
-  CodeMirror.defineExtension = function(name, func) {
-    extensions[name] = func;
-  };
-
-  var initHooks = [];
-  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
+
+  CodeMirror.defineMode("null", function() {
+    return {token: function(stream) {stream.skipToEnd();}};
+  });
+  CodeMirror.defineMIME("text/plain", "null");
 
   var modeExtensions = CodeMirror.modeExtensions = {};
   CodeMirror.extendMode = function(mode, properties) {
     var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
-    for (var prop in properties) if (properties.hasOwnProperty(prop))
-      exts[prop] = properties[prop];
+    copyObj(properties, exts);
   };
 
-  var commands = CodeMirror.commands = {
-    selectAll: function(cm) {cm.setSelection({line: 0, ch: 0}, {line: cm.lineCount() - 1});},
-    killLine: function(cm) {
-      var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
-      if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {line: from.line + 1, ch: 0});
-      else cm.replaceRange("", from, sel ? to : {line: from.line});
-    },
-    deleteLine: function(cm) {var l = cm.getCursor().line; cm.replaceRange("", {line: l, ch: 0}, {line: l});},
-    undo: function(cm) {cm.undo();},
-    redo: function(cm) {cm.redo();},
-    goDocStart: function(cm) {cm.setCursor(0, 0, true);},
-    goDocEnd: function(cm) {cm.setSelection({line: cm.lineCount() - 1}, null, true);},
-    goLineStart: function(cm) {cm.setCursor(cm.getCursor().line, 0, true);},
-    goLineStartSmart: function(cm) {
-      var cur = cm.getCursor();
-      var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
-      cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
-    },
-    goLineEnd: function(cm) {cm.setSelection({line: cm.getCursor().line}, null, true);},
-    goLineUp: function(cm) {cm.moveV(-1, "line");},
-    goLineDown: function(cm) {cm.moveV(1, "line");},
-    goPageUp: function(cm) {cm.moveV(-1, "page");},
-    goPageDown: function(cm) {cm.moveV(1, "page");},
-    goCharLeft: function(cm) {cm.moveH(-1, "char");},
-    goCharRight: function(cm) {cm.moveH(1, "char");},
-    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
-    goColumnRight: function(cm) {cm.moveH(1, "column");},
-    goWordLeft: function(cm) {cm.moveH(-1, "word");},
-    goWordRight: function(cm) {cm.moveH(1, "word");},
-    delCharLeft: function(cm) {cm.deleteH(-1, "char");},
-    delCharRight: function(cm) {cm.deleteH(1, "char");},
-    delWordLeft: function(cm) {cm.deleteH(-1, "word");},
-    delWordRight: function(cm) {cm.deleteH(1, "word");},
-    indentAuto: function(cm) {cm.indentSelection("smart");},
-    indentMore: function(cm) {cm.indentSelection("add");},
-    indentLess: function(cm) {cm.indentSelection("subtract");},
-    insertTab: function(cm) {cm.replaceSelection("\t", "end");},
-    defaultTab: function(cm) {
-      if (cm.somethingSelected()) cm.indentSelection("add");
-      else cm.replaceSelection("\t", "end");
-    },
-    transposeChars: function(cm) {
-      var cur = cm.getCursor(), line = cm.getLine(cur.line);
-      if (cur.ch > 0 && cur.ch < line.length - 1)
-        cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
-                        {line: cur.line, ch: cur.ch - 1}, {line: cur.line, ch: cur.ch + 1});
-    },
-    newlineAndIndent: function(cm) {
-      cm.replaceSelection("\n", "end");
-      cm.indentLine(cm.getCursor().line);
-    },
-    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
-  };
-
-  var keyMap = CodeMirror.keyMap = {};
-  keyMap.basic = {
-    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
-    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
-    "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
-    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
-  };
-  // Note that the save and find-related commands aren't defined by
-  // default. Unknown commands are simply ignored.
-  keyMap.pcDefault = {
-    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
-    "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
-    "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
-    "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
-    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
-    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
-    fallthrough: "basic"
-  };
-  keyMap.macDefault = {
-    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
-    "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goWordLeft",
-    "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
-    "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
-    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
-    "Cmd-[": "indentLess", "Cmd-]": "indentMore",
-    fallthrough: ["basic", "emacsy"]
-  };
-  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
-  keyMap.emacsy = {
-    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
-    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
-    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharRight", "Ctrl-H": "delCharLeft",
-    "Alt-D": "delWordRight", "Alt-Backspace": "delWordLeft", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
+  // EXTENSIONS
+
+  CodeMirror.defineExtension = function(name, func) {
+    CodeMirror.prototype[name] = func;
   };
-
-  function getKeyMap(val) {
-    if (typeof val == "string") return keyMap[val];
-    else return val;
-  }
-  function lookupKey(name, extraMap, map, handle, stop) {
-    function lookup(map) {
-      map = getKeyMap(map);
-      var found = map[name];
-      if (found === false) {
-        if (stop) stop();
-        return true;
-      }
-      if (found != null && handle(found)) return true;
-      if (map.nofallthrough) {
-        if (stop) stop();
-        return true;
-      }
-      var fallthrough = map.fallthrough;
-      if (fallthrough == null) return false;
-      if (Object.prototype.toString.call(fallthrough) != "[object Array]")
-        return lookup(fallthrough);
-      for (var i = 0, e = fallthrough.length; i < e; ++i) {
-        if (lookup(fallthrough[i])) return true;
-      }
-      return false;
-    }
-    if (extraMap && lookup(extraMap)) return true;
-    return lookup(map);
-  }
-  function isModifierKey(event) {
-    var name = keyNames[e_prop(event, "keyCode")];
-    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
-  }
-  CodeMirror.isModifierKey = isModifierKey;
-
-  CodeMirror.fromTextArea = function(textarea, options) {
-    if (!options) options = {};
-    options.value = textarea.value;
-    if (!options.tabindex && textarea.tabindex)
-      options.tabindex = textarea.tabindex;
-    // Set autofocus to true if this textarea is focused, or if it has
-    // autofocus and no other element is focused.
-    if (options.autofocus == null) {
-      var hasFocus = document.body;
-      // doc.activeElement occasionally throws on IE
-      try { hasFocus = document.activeElement; } catch(e) {}
-      options.autofocus = hasFocus == textarea ||
-        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
-    }
-
-    function save() {textarea.value = instance.getValue();}
-    if (textarea.form) {
-      // Deplorable hack to make the submit method do the right thing.
-      var rmSubmit = connect(textarea.form, "submit", save, true);
-      var realSubmit = textarea.form.submit;
-      textarea.form.submit = function wrappedSubmit() {
-        save();
-        textarea.form.submit = realSubmit;
-        textarea.form.submit();
-        textarea.form.submit = wrappedSubmit;
-      };
-    }
-
-    textarea.style.display = "none";
-    var instance = CodeMirror(function(node) {
-      textarea.parentNode.insertBefore(node, textarea.nextSibling);
-    }, options);
-    instance.save = save;
-    instance.getTextArea = function() { return textarea; };
-    instance.toTextArea = function() {
-      save();
-      textarea.parentNode.removeChild(instance.getWrapperElement());
-      textarea.style.display = "";
-      if (textarea.form) {
-        rmSubmit();
-        if (typeof textarea.form.submit == "function")
-          textarea.form.submit = realSubmit;
-      }
-    };
-    return instance;
+  CodeMirror.defineDocExtension = function(name, func) {
+    Doc.prototype[name] = func;
   };
-
-  var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
-  var ie = /MSIE \d/.test(navigator.userAgent);
-  var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
-  var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
-  var quirksMode = ie && document.documentMode == 5;
-  var webkit = /WebKit\//.test(navigator.userAgent);
-  var chrome = /Chrome\//.test(navigator.userAgent);
-  var opera = /Opera\//.test(navigator.userAgent);
-  var safari = /Apple Computer/.test(navigator.vendor);
-  var khtml = /KHTML\//.test(navigator.userAgent);
-  var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);
+  CodeMirror.defineOption = option;
+
+  var initHooks = [];
+  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
+
+  // MODE STATE HANDLING
 
   // Utility functions for working with state. Exported because modes
   // sometimes need to do this.
@@ -2290,10 +3228,12 @@
     return nstate;
   }
   CodeMirror.copyState = copyState;
+
   function startState(mode, a1, a2) {
     return mode.startState ? mode.startState(a1, a2) : true;
   }
   CodeMirror.startState = startState;
+
   CodeMirror.innerMode = function(mode, state) {
     while (mode.innerMode) {
       var info = mode.innerMode(state);
@@ -2303,12 +3243,243 @@
     return info || {mode: mode, state: state};
   };
 
+  // STANDARD COMMANDS
+
+  var commands = CodeMirror.commands = {
+    selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()));},
+    killLine: function(cm) {
+      var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
+      if (!sel && cm.getLine(from.line).length == from.ch)
+        cm.replaceRange("", from, Pos(from.line + 1, 0), "+delete");
+      else cm.replaceRange("", from, sel ? to : Pos(from.line), "+delete");
+    },
+    deleteLine: function(cm) {
+      var l = cm.getCursor().line;
+      cm.replaceRange("", Pos(l, 0), Pos(l), "+delete");
+    },
+    undo: function(cm) {cm.undo();},
+    redo: function(cm) {cm.redo();},
+    goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
+    goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
+    goLineStart: function(cm) {
+      cm.extendSelection(lineStart(cm, cm.getCursor().line));
+    },
+    goLineStartSmart: function(cm) {
+      var cur = cm.getCursor(), start = lineStart(cm, cur.line);
+      var line = cm.getLineHandle(start.line);
+      var order = getOrder(line);
+      if (!order || order[0].level == 0) {
+        var firstNonWS = Math.max(0, line.text.search(/\S/));
+        var inWS = cur.line == start.line && cur.ch <= firstNonWS && cur.ch;
+        cm.extendSelection(Pos(start.line, inWS ? 0 : firstNonWS));
+      } else cm.extendSelection(start);
+    },
+    goLineEnd: function(cm) {
+      cm.extendSelection(lineEnd(cm, cm.getCursor().line));
+    },
+    goLineRight: function(cm) {
+      var top = cm.charCoords(cm.getCursor(), "div").top + 5;
+      cm.extendSelection(cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div"));
+    },
+    goLineLeft: function(cm) {
+      var top = cm.charCoords(cm.getCursor(), "div").top + 5;
+      cm.extendSelection(cm.coordsChar({left: 0, top: top}, "div"));
+    },
+    goLineUp: function(cm) {cm.moveV(-1, "line");},
+    goLineDown: function(cm) {cm.moveV(1, "line");},
+    goPageUp: function(cm) {cm.moveV(-1, "page");},
+    goPageDown: function(cm) {cm.moveV(1, "page");},
+    goCharLeft: function(cm) {cm.moveH(-1, "char");},
+    goCharRight: function(cm) {cm.moveH(1, "char");},
+    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
+    goColumnRight: function(cm) {cm.moveH(1, "column");},
+    goWordLeft: function(cm) {cm.moveH(-1, "word");},
+    goGroupRight: function(cm) {cm.moveH(1, "group");},
+    goGroupLeft: function(cm) {cm.moveH(-1, "group");},
+    goWordRight: function(cm) {cm.moveH(1, "word");},
+    delCharBefore: function(cm) {cm.deleteH(-1, "char");},
+    delCharAfter: function(cm) {cm.deleteH(1, "char");},
+    delWordBefore: function(cm) {cm.deleteH(-1, "word");},
+    delWordAfter: function(cm) {cm.deleteH(1, "word");},
+    delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
+    delGroupAfter: function(cm) {cm.deleteH(1, "group");},
+    indentAuto: function(cm) {cm.indentSelection("smart");},
+    indentMore: function(cm) {cm.indentSelection("add");},
+    indentLess: function(cm) {cm.indentSelection("subtract");},
+    insertTab: function(cm) {cm.replaceSelection("\t", "end", "+input");},
+    defaultTab: function(cm) {
+      if (cm.somethingSelected()) cm.indentSelection("add");
+      else cm.replaceSelection("\t", "end", "+input");
+    },
+    transposeChars: function(cm) {
+      var cur = cm.getCursor(), line = cm.getLine(cur.line);
+      if (cur.ch > 0 && cur.ch < line.length - 1)
+        cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
+                        Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));
+    },
+    newlineAndIndent: function(cm) {
+      operation(cm, function() {
+        cm.replaceSelection("\n", "end", "+input");
+        cm.indentLine(cm.getCursor().line, null, true);
+      })();
+    },
+    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
+  };
+
+  // STANDARD KEYMAPS
+
+  var keyMap = CodeMirror.keyMap = {};
+  keyMap.basic = {
+    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
+    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
+    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
+    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
+  };
+  // Note that the save and find-related commands aren't defined by
+  // default. Unknown commands are simply ignored.
+  keyMap.pcDefault = {
+    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
+    "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
+    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
+    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
+    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
+    fallthrough: "basic"
+  };
+  keyMap.macDefault = {
+    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
+    "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
+    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delGroupBefore",
+    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
+    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+    "Cmd-[": "indentLess", "Cmd-]": "indentMore",
+    fallthrough: ["basic", "emacsy"]
+  };
+  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
+  keyMap.emacsy = {
+    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
+    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
+    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
+    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
+  };
+
+  // KEYMAP DISPATCH
+
+  function getKeyMap(val) {
+    if (typeof val == "string") return keyMap[val];
+    else return val;
+  }
+
+  function lookupKey(name, maps, handle) {
+    function lookup(map) {
+      map = getKeyMap(map);
+      var found = map[name];
+      if (found === false) return "stop";
+      if (found != null && handle(found)) return true;
+      if (map.nofallthrough) return "stop";
+
+      var fallthrough = map.fallthrough;
+      if (fallthrough == null) return false;
+      if (Object.prototype.toString.call(fallthrough) != "[object Array]")
+        return lookup(fallthrough);
+      for (var i = 0, e = fallthrough.length; i < e; ++i) {
+        var done = lookup(fallthrough[i]);
+        if (done) return done;
+      }
+      return false;
+    }
+
+    for (var i = 0; i < maps.length; ++i) {
+      var done = lookup(maps[i]);
+      if (done) return done;
+    }
+  }
+  function isModifierKey(event) {
+    var name = keyNames[event.keyCode];
+    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
+  }
+  function keyName(event, noShift) {
+    if (opera && event.keyCode == 34 && event["char"]) return false;
+    var name = keyNames[event.keyCode];
+    if (name == null || event.altGraphKey) return false;
+    if (event.altKey) name = "Alt-" + name;
+    if (flipCtrlCmd ? event.metaKey : event.ctrlKey) name = "Ctrl-" + name;
+    if (flipCtrlCmd ? event.ctrlKey : event.metaKey) name = "Cmd-" + name;
+    if (!noShift && event.shiftKey) name = "Shift-" + name;
+    return name;
+  }
+  CodeMirror.lookupKey = lookupKey;
+  CodeMirror.isModifierKey = isModifierKey;
+  CodeMirror.keyName = keyName;
+
+  // FROMTEXTAREA
+
+  CodeMirror.fromTextArea = function(textarea, options) {
+    if (!options) options = {};
+    options.value = textarea.value;
+    if (!options.tabindex && textarea.tabindex)
+      options.tabindex = textarea.tabindex;
+    if (!options.placeholder && textarea.placeholder)
+      options.placeholder = textarea.placeholder;
+    // Set autofocus to true if this textarea is focused, or if it has
+    // autofocus and no other element is focused.
+    if (options.autofocus == null) {
+      var hasFocus = document.body;
+      // doc.activeElement occasionally throws on IE
+      try { hasFocus = document.activeElement; } catch(e) {}
+      options.autofocus = hasFocus == textarea ||
+        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
+    }
+
+    function save() {textarea.value = cm.getValue();}
+    if (textarea.form) {
+      on(textarea.form, "submit", save);
+      // Deplorable hack to make the submit method do the right thing.
+      if (!options.leaveSubmitMethodAlone) {
+        var form = textarea.form, realSubmit = form.submit;
+        try {
+          var wrappedSubmit = form.submit = function() {
+            save();
+            form.submit = realSubmit;
+            form.submit();
+            form.submit = wrappedSubmit;
+          };
+        } catch(e) {}
+      }
+    }
+
+    textarea.style.display = "none";
+    var cm = CodeMirror(function(node) {
+      textarea.parentNode.insertBefore(node, textarea.nextSibling);
+    }, options);
+    cm.save = save;
+    cm.getTextArea = function() { return textarea; };
+    cm.toTextArea = function() {
+      save();
+      textarea.parentNode.removeChild(cm.getWrapperElement());
+      textarea.style.display = "";
+      if (textarea.form) {
+        off(textarea.form, "submit", save);
+        if (typeof textarea.form.submit == "function")
+          textarea.form.submit = realSubmit;
+      }
+    };
+    return cm;
+  };
+
+  // STRING STREAM
+
+  // Fed to the mode parsers, provides helper functions to make
+  // parsers more succinct.
+
   // The character stream used by a mode's parser.
   function StringStream(string, tabSize) {
     this.pos = this.start = 0;
     this.string = string;
     this.tabSize = tabSize || 8;
-  }
+    this.lastColumnPos = this.lastColumnValue = 0;
+  }
+
   StringStream.prototype = {
     eol: function() {return this.pos >= this.string.length;},
     sol: function() {return this.pos == 0;},
@@ -2339,12 +3510,19 @@
       if (found > -1) {this.pos = found; return true;}
     },
     backUp: function(n) {this.pos -= n;},
-    column: function() {return countColumn(this.string, this.start, this.tabSize);},
+    column: function() {
+      if (this.lastColumnPos < this.start) {
+        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
+        this.lastColumnPos = this.start;
+      }
+      return this.lastColumnValue;
+    },
     indentation: function() {return countColumn(this.string, null, this.tabSize);},
     match: function(pattern, consume, caseInsensitive) {
       if (typeof pattern == "string") {
         var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
-        if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
+        var substr = this.string.substr(this.pos, pattern.length);
+        if (cased(substr) == cased(pattern)) {
           if (consume !== false) this.pos += pattern.length;
           return true;
         }
@@ -2359,9 +3537,195 @@
   };
   CodeMirror.StringStream = StringStream;
 
-  function MarkedSpan(from, to, marker) {
-    this.from = from; this.to = to; this.marker = marker;
-  }
+  // TEXTMARKERS
+
+  function TextMarker(doc, type) {
+    this.lines = [];
+    this.type = type;
+    this.doc = doc;
+  }
+  CodeMirror.TextMarker = TextMarker;
+
+  TextMarker.prototype.clear = function() {
+    if (this.explicitlyCleared) return;
+    var cm = this.doc.cm, withOp = cm && !cm.curOp;
+    if (withOp) startOperation(cm);
+    var min = null, max = null;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (span.to != null) max = lineNo(line);
+      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
+      if (span.from != null)
+        min = lineNo(line);
+      else if (this.collapsed && !lineIsHidden(this.doc, line) && cm)
+        updateLineHeight(line, textHeight(cm.display));
+    }
+    if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
+      var visual = visualLine(cm.doc, this.lines[i]), len = lineLength(cm.doc, visual);
+      if (len > cm.display.maxLineLength) {
+        cm.display.maxLine = visual;
+        cm.display.maxLineLength = len;
+        cm.display.maxLineChanged = true;
+      }
+    }
+
+    if (min != null && cm) regChange(cm, min, max + 1);
+    this.lines.length = 0;
+    this.explicitlyCleared = true;
+    if (this.collapsed && this.doc.cantEdit) {
+      this.doc.cantEdit = false;
+      if (cm) reCheckSelection(cm);
+    }
+    if (withOp) endOperation(cm);
+    signalLater(this, "clear");
+  };
+
+  TextMarker.prototype.find = function() {
+    var from, to;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (span.from != null || span.to != null) {
+        var found = lineNo(line);
+        if (span.from != null) from = Pos(found, span.from);
+        if (span.to != null) to = Pos(found, span.to);
+      }
+    }
+    if (this.type == "bookmark") return from;
+    return from && {from: from, to: to};
+  };
+
+  TextMarker.prototype.getOptions = function(copyWidget) {
+    var repl = this.replacedWith;
+    return {className: this.className,
+            inclusiveLeft: this.inclusiveLeft, inclusiveRight: this.inclusiveRight,
+            atomic: this.atomic,
+            collapsed: this.collapsed,
+            replacedWith: copyWidget ? repl && repl.cloneNode(true) : repl,
+            readOnly: this.readOnly,
+            startStyle: this.startStyle, endStyle: this.endStyle};
+  };
+
+  TextMarker.prototype.attachLine = function(line) {
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp;
+      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
+        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
+    }
+    this.lines.push(line);
+  };
+  TextMarker.prototype.detachLine = function(line) {
+    this.lines.splice(indexOf(this.lines, line), 1);
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp;
+      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
+    }
+  };
+
+  function markText(doc, from, to, options, type) {
+    if (options && options.shared) return markTextShared(doc, from, to, options, type);
+    if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
+
+    var marker = new TextMarker(doc, type);
+    if (type == "range" && !posLess(from, to)) return marker;
+    if (options) copyObj(options, marker);
+    if (marker.replacedWith) {
+      marker.collapsed = true;
+      marker.replacedWith = elt("span", [marker.replacedWith], "CodeMirror-widget");
+    }
+    if (marker.collapsed) sawCollapsedSpans = true;
+
+    if (marker.addToHistory)
+      addToHistory(doc, {from: from, to: to, origin: "markText"},
+                   {head: doc.sel.head, anchor: doc.sel.anchor}, NaN);
+
+    var curLine = from.line, size = 0, collapsedAtStart, collapsedAtEnd, cm = doc.cm, updateMaxLine;
+    doc.iter(curLine, to.line + 1, function(line) {
+      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(doc, line) == cm.display.maxLine)
+        updateMaxLine = true;
+      var span = {from: null, to: null, marker: marker};
+      size += line.text.length;
+      if (curLine == from.line) {span.from = from.ch; size -= from.ch;}
+      if (curLine == to.line) {span.to = to.ch; size -= line.text.length - to.ch;}
+      if (marker.collapsed) {
+        if (curLine == to.line) collapsedAtEnd = collapsedSpanAt(line, to.ch);
+        if (curLine == from.line) collapsedAtStart = collapsedSpanAt(line, from.ch);
+        else updateLineHeight(line, 0);
+      }
+      addMarkedSpan(line, span);
+      ++curLine;
+    });
+    if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
+      if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
+    });
+
+    if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
+
+    if (marker.readOnly) {
+      sawReadOnlySpans = true;
+      if (doc.history.done.length || doc.history.undone.length)
+        doc.clearHistory();
+    }
+    if (marker.collapsed) {
+      if (collapsedAtStart != collapsedAtEnd)
+        throw new Error("Inserting collapsed marker overlapping an existing one");
+      marker.size = size;
+      marker.atomic = true;
+    }
+    if (cm) {
+      if (updateMaxLine) cm.curOp.updateMaxLine = true;
+      if (marker.className || marker.startStyle || marker.endStyle || marker.collapsed)
+        regChange(cm, from.line, to.line + 1);
+      if (marker.atomic) reCheckSelection(cm);
+    }
+    return marker;
+  }
+
+  // SHARED TEXTMARKERS
+
+  function SharedTextMarker(markers, primary) {
+    this.markers = markers;
+    this.primary = primary;
+    for (var i = 0, me = this; i < markers.length; ++i) {
+      markers[i].parent = this;
+      on(markers[i], "clear", function(){me.clear();});
+    }
+  }
+  CodeMirror.SharedTextMarker = SharedTextMarker;
+
+  SharedTextMarker.prototype.clear = function() {
+    if (this.explicitlyCleared) return;
+    this.explicitlyCleared = true;
+    for (var i = 0; i < this.markers.length; ++i)
+      this.markers[i].clear();
+    signalLater(this, "clear");
+  };
+  SharedTextMarker.prototype.find = function() {
+    return this.primary.find();
+  };
+  SharedTextMarker.prototype.getOptions = function(copyWidget) {
+    var inner = this.primary.getOptions(copyWidget);
+    inner.shared = true;
+    return inner;
+  };
+
+  function markTextShared(doc, from, to, options, type) {
+    options = copyObj(options);
+    options.shared = false;
+    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
+    var widget = options.replacedWith;
+    linkedDocs(doc, function(doc) {
+      if (widget) options.replacedWith = widget.cloneNode(true);
+      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
+      for (var i = 0; i < doc.linked.length; ++i)
+        if (doc.linked[i].isParent) return;
+      primary = lst(markers);
+    });
+    return new SharedTextMarker(markers, primary);
+  }
+
+  // TEXTMARKER SPANS
 
   function getMarkedSpanFor(spans, marker) {
     if (spans) for (var i = 0; i < spans.length; ++i) {
@@ -2369,19 +3733,21 @@
       if (span.marker == marker) return span;
     }
   }
-
   function removeMarkedSpan(spans, span) {
-    var r;
-    for (var i = 0; i < spans.length; ++i)
+    for (var r, i = 0; i < spans.length; ++i)
       if (spans[i] != span) (r || (r = [])).push(spans[i]);
     return r;
   }
-
-  function markedSpansBefore(old, startCh, endCh) {
+  function addMarkedSpan(line, span) {
+    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
+    span.marker.attachLine(line);
+  }
+
+  function markedSpansBefore(old, startCh, isInsert) {
     if (old) for (var i = 0, nw; i < old.length; ++i) {
       var span = old[i], marker = span.marker;
       var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
-      if (startsBefore || marker.type == "bookmark" && span.from == startCh && span.from != endCh) {
+      if (startsBefore || marker.type == "bookmark" && span.from == startCh && (!isInsert || !span.marker.insertLeft)) {
         var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
         (nw || (nw = [])).push({from: span.from,
                                 to: endsAfter ? null : span.to,
@@ -2391,11 +3757,11 @@
     return nw;
   }
 
-  function markedSpansAfter(old, endCh) {
+  function markedSpansAfter(old, endCh, isInsert) {
     if (old) for (var i = 0, nw; i < old.length; ++i) {
       var span = old[i], marker = span.marker;
       var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
-      if (endsAfter || marker.type == "bookmark" && span.from == endCh) {
+      if (endsAfter || marker.type == "bookmark" && span.from == endCh && (!isInsert || span.marker.insertLeft)) {
         var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
         (nw || (nw = [])).push({from: startsBefore ? null : span.from - endCh,
                                 to: span.to == null ? null : span.to - endCh,
@@ -2405,14 +3771,18 @@
     return nw;
   }
 
-  function updateMarkedSpans(oldFirst, oldLast, startCh, endCh, newText) {
-    if (!oldFirst && !oldLast) return newText;
+  function stretchSpansOverChange(doc, change) {
+    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
+    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
+    if (!oldFirst && !oldLast) return null;
+
+    var startCh = change.from.ch, endCh = change.to.ch, isInsert = posEq(change.from, change.to);
     // Get the spans that 'stick out' on both sides
-    var first = markedSpansBefore(oldFirst, startCh);
-    var last = markedSpansAfter(oldLast, endCh);
+    var first = markedSpansBefore(oldFirst, startCh, isInsert);
+    var last = markedSpansAfter(oldLast, endCh, isInsert);
 
     // Next, merge those two ends
-    var sameLine = newText.length == 1, offset = lst(newText).length + (sameLine ? startCh : 0);
+    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
     if (first) {
       // Fix up .to properties of first
       for (var i = 0; i < first.length; ++i) {
@@ -2442,261 +3812,560 @@
       }
     }
 
-    var newMarkers = [newHL(newText[0], first)];
+    var newMarkers = [first];
     if (!sameLine) {
       // Fill gap with whole-line-spans
-      var gap = newText.length - 2, gapMarkers;
+      var gap = change.text.length - 2, gapMarkers;
       if (gap > 0 && first)
         for (var i = 0; i < first.length; ++i)
           if (first[i].to == null)
             (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});
       for (var i = 0; i < gap; ++i)
-        newMarkers.push(newHL(newText[i+1], gapMarkers));
-      newMarkers.push(newHL(lst(newText), last));
+        newMarkers.push(gapMarkers);
+      newMarkers.push(last);
     }
     return newMarkers;
   }
 
-  // hl stands for history-line, a data structure that can be either a
-  // string (line without markers) or a {text, markedSpans} object.
-  function hlText(val) { return typeof val == "string" ? val : val.text; }
-  function hlSpans(val) {
-    if (typeof val == "string") return null;
-    var spans = val.markedSpans, out = null;
-    for (var i = 0; i < spans.length; ++i) {
-      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
-      else if (out) out.push(spans[i]);
-    }
-    return !out ? spans : out.length ? out : null;
-  }
-  function newHL(text, spans) { return spans ? {text: text, markedSpans: spans} : text; }
+  function mergeOldSpans(doc, change) {
+    var old = getOldSpans(doc, change);
+    var stretched = stretchSpansOverChange(doc, change);
+    if (!old) return stretched;
+    if (!stretched) return old;
+
+    for (var i = 0; i < old.length; ++i) {
+      var oldCur = old[i], stretchCur = stretched[i];
+      if (oldCur && stretchCur) {
+        spans: for (var j = 0; j < stretchCur.length; ++j) {
+          var span = stretchCur[j];
+          for (var k = 0; k < oldCur.length; ++k)
+            if (oldCur[k].marker == span.marker) continue spans;
+          oldCur.push(span);
+        }
+      } else if (stretchCur) {
+        old[i] = stretchCur;
+      }
+    }
+    return old;
+  }
+
+  function removeReadOnlyRanges(doc, from, to) {
+    var markers = null;
+    doc.iter(from.line, to.line + 1, function(line) {
+      if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
+        var mark = line.markedSpans[i].marker;
+        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
+          (markers || (markers = [])).push(mark);
+      }
+    });
+    if (!markers) return null;
+    var parts = [{from: from, to: to}];
+    for (var i = 0; i < markers.length; ++i) {
+      var mk = markers[i], m = mk.find();
+      for (var j = 0; j < parts.length; ++j) {
+        var p = parts[j];
+        if (posLess(p.to, m.from) || posLess(m.to, p.from)) continue;
+        var newParts = [j, 1];
+        if (posLess(p.from, m.from) || !mk.inclusiveLeft && posEq(p.from, m.from))
+          newParts.push({from: p.from, to: m.from});
+        if (posLess(m.to, p.to) || !mk.inclusiveRight && posEq(p.to, m.to))
+          newParts.push({from: m.to, to: p.to});
+        parts.splice.apply(parts, newParts);
+        j += newParts.length - 1;
+      }
+    }
+    return parts;
+  }
+
+  function collapsedSpanAt(line, ch) {
+    var sps = sawCollapsedSpans && line.markedSpans, found;
+    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (!sp.marker.collapsed) continue;
+      if ((sp.from == null || sp.from < ch) &&
+          (sp.to == null || sp.to > ch) &&
+          (!found || found.width < sp.marker.width))
+        found = sp.marker;
+    }
+    return found;
+  }
+  function collapsedSpanAtStart(line) { return collapsedSpanAt(line, -1); }
+  function collapsedSpanAtEnd(line) { return collapsedSpanAt(line, line.text.length + 1); }
+
+  function visualLine(doc, line) {
+    var merged;
+    while (merged = collapsedSpanAtStart(line))
+      line = getLine(doc, merged.find().from.line);
+    return line;
+  }
+
+  function lineIsHidden(doc, line) {
+    var sps = sawCollapsedSpans && line.markedSpans;
+    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (!sp.marker.collapsed) continue;
+      if (sp.from == null) return true;
+      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
+        return true;
+    }
+  }
+  function lineIsHiddenInner(doc, line, span) {
+    if (span.to == null) {
+      var end = span.marker.find().to, endLine = getLine(doc, end.line);
+      return lineIsHiddenInner(doc, endLine, getMarkedSpanFor(endLine.markedSpans, span.marker));
+    }
+    if (span.marker.inclusiveRight && span.to == line.text.length)
+      return true;
+    for (var sp, i = 0; i < line.markedSpans.length; ++i) {
+      sp = line.markedSpans[i];
+      if (sp.marker.collapsed && sp.from == span.to &&
+          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
+          lineIsHiddenInner(doc, line, sp)) return true;
+    }
+  }
 
   function detachMarkedSpans(line) {
     var spans = line.markedSpans;
     if (!spans) return;
-    for (var i = 0; i < spans.length; ++i) {
-      var lines = spans[i].marker.lines;
-      var ix = indexOf(lines, line);
-      lines.splice(ix, 1);
-    }
+    for (var i = 0; i < spans.length; ++i)
+      spans[i].marker.detachLine(line);
     line.markedSpans = null;
   }
 
   function attachMarkedSpans(line, spans) {
     if (!spans) return;
     for (var i = 0; i < spans.length; ++i)
-      var marker = spans[i].marker.lines.push(line);
+      spans[i].marker.attachLine(line);
     line.markedSpans = spans;
   }
 
-  // When measuring the position of the end of a line, different
-  // browsers require different approaches. If an empty span is added,
-  // many browsers report bogus offsets. Of those, some (Webkit,
-  // recent IE) will accept a space without moving the whole span to
-  // the next line when wrapping it, others work with a zero-width
-  // space.
-  var eolSpanContent = " ";
-  if (gecko || (ie && !ie_lt8)) eolSpanContent = "\u200b";
-  else if (opera) eolSpanContent = "";
+  // LINE WIDGETS
+
+  var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {
+    for (var opt in options) if (options.hasOwnProperty(opt))
+      this[opt] = options[opt];
+    this.cm = cm;
+    this.node = node;
+  };
+  function widgetOperation(f) {
+    return function() {
+      var withOp = !this.cm.curOp;
+      if (withOp) startOperation(this.cm);
+      try {var result = f.apply(this, arguments);}
+      finally {if (withOp) endOperation(this.cm);}
+      return result;
+    };
+  }
+  LineWidget.prototype.clear = widgetOperation(function() {
+    var ws = this.line.widgets, no = lineNo(this.line);
+    if (no == null || !ws) return;
+    for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
+    if (!ws.length) this.line.widgets = null;
+    updateLineHeight(this.line, Math.max(0, this.line.height - widgetHeight(this)));
+    regChange(this.cm, no, no + 1);
+  });
+  LineWidget.prototype.changed = widgetOperation(function() {
+    var oldH = this.height;
+    this.height = null;
+    var diff = widgetHeight(this) - oldH;
+    if (!diff) return;
+    updateLineHeight(this.line, this.line.height + diff);
+    var no = lineNo(this.line);
+    regChange(this.cm, no, no + 1);
+  });
+
+  function widgetHeight(widget) {
+    if (widget.height != null) return widget.height;
+    if (!widget.node.parentNode || widget.node.parentNode.nodeType != 1)
+      removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, "position: relative"));
+    return widget.height = widget.node.offsetHeight;
+  }
+
+  function addLineWidget(cm, handle, node, options) {
+    var widget = new LineWidget(cm, node, options);
+    if (widget.noHScroll) cm.display.alignWidgets = true;
+    changeLine(cm, handle, function(line) {
+      (line.widgets || (line.widgets = [])).push(widget);
+      widget.line = line;
+      if (!lineIsHidden(cm.doc, line) || widget.showIfHidden) {
+        var aboveVisible = heightAtLine(cm, line) < cm.display.scroller.scrollTop;
+        updateLineHeight(line, line.height + widgetHeight(widget));
+        if (aboveVisible) addToScrollPos(cm, 0, widget.height);
+      }
+      return true;
+    });
+    return widget;
+  }
+
+  // LINE DATA STRUCTURE
 
   // Line objects. These hold state related to a line, including
   // highlighting info (the styles array).
-  function Line(text, markedSpans) {
-    this.text = text;
-    this.height = 1;
-    attachMarkedSpans(this, markedSpans);
-  }
-  Line.prototype = {
-    update: function(text, markedSpans) {
-      this.text = text;
-      this.stateAfter = this.styles = null;
-      detachMarkedSpans(this);
-      attachMarkedSpans(this, markedSpans);
-    },
-    // Run the given mode's parser over a line, update the styles
-    // array, which contains alternating fragments of text and CSS
-    // classes.
-    highlight: function(mode, state, tabSize) {
-      var stream = new StringStream(this.text, tabSize), st = this.styles || (this.styles = []);
-      var pos = st.length = 0;
-      if (this.text == "" && mode.blankLine) mode.blankLine(state);
-      while (!stream.eol()) {
-        var style = mode.token(stream, state), substr = stream.current();
-        stream.start = stream.pos;
-        if (pos && st[pos-1] == style) {
-          st[pos-2] += substr;
-        } else if (substr) {
-          st[pos++] = substr; st[pos++] = style;
-        }
-        // Give up when line is ridiculously long
-        if (stream.pos > 5000) {
-          st[pos++] = this.text.slice(stream.pos); st[pos++] = null;
-          break;
-        }
-      }
-    },
-    process: function(mode, state, tabSize) {
-      var stream = new StringStream(this.text, tabSize);
-      if (this.text == "" && mode.blankLine) mode.blankLine(state);
-      while (!stream.eol() && stream.pos <= 5000) {
-        mode.token(stream, state);
-        stream.start = stream.pos;
+  function makeLine(text, markedSpans, estimateHeight) {
+    var line = {text: text};
+    attachMarkedSpans(line, markedSpans);
+    line.height = estimateHeight ? estimateHeight(line) : 1;
+    return line;
+  }
+
+  function updateLine(line, text, markedSpans, estimateHeight) {
+    line.text = text;
+    if (line.stateAfter) line.stateAfter = null;
+    if (line.styles) line.styles = null;
+    if (line.order != null) line.order = null;
+    detachMarkedSpans(line);
+    attachMarkedSpans(line, markedSpans);
+    var estHeight = estimateHeight ? estimateHeight(line) : 1;
+    if (estHeight != line.height) updateLineHeight(line, estHeight);
+  }
+
+  function cleanUpLine(line) {
+    line.parent = null;
+    detachMarkedSpans(line);
+  }
+
+  // Run the given mode's parser over a line, update the styles
+  // array, which contains alternating fragments of text and CSS
+  // classes.
+  function runMode(cm, text, mode, state, f) {
+    var flattenSpans = mode.flattenSpans;
+    if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
+    var curText = "", curStyle = null;
+    var stream = new StringStream(text, cm.options.tabSize), style;
+    if (text == "" && mode.blankLine) mode.blankLine(state);
+    while (!stream.eol()) {
+      if (stream.pos > cm.options.maxHighlightLength) {
+        flattenSpans = false;
+        // Webkit seems to refuse to render text nodes longer than 57444 characters
+        stream.pos = Math.min(text.length, stream.start + 50000);
+        style = null;
+      } else {
+        style = mode.token(stream, state);
       }
-    },
-    // Fetch the parser token for a given character. Useful for hacks
-    // that want to inspect the mode state (say, for completion).
-    getTokenAt: function(mode, state, tabSize, ch) {
-      var txt = this.text, stream = new StringStream(txt, tabSize);
-      while (stream.pos < ch && !stream.eol()) {
-        stream.start = stream.pos;
-        var style = mode.token(stream, state);
-      }
-      return {start: stream.start,
-              end: stream.pos,
-              string: stream.current(),
-              className: style || null,
-              state: state};
-    },
-    indentation: function(tabSize) {return countColumn(this.text, null, tabSize);},
-    // Produces an HTML fragment for the line, taking selection,
-    // marking, and highlighting into account.
-    getContent: function(tabSize, wrapAt, compensateForWrapping) {
-      var first = true, col = 0, specials = /[\t\u0000-\u0019\u200b\u2028\u2029\uFEFF]/g;
-      var pre = elt("pre");
-      function span_(html, text, style) {
-        if (!text) return;
-        // Work around a bug where, in some compat modes, IE ignores leading spaces
-        if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
-        first = false;
-        if (!specials.test(text)) {
-          col += text.length;
-          var content = document.createTextNode(text);
+      var substr = stream.current();
+      stream.start = stream.pos;
+      if (!flattenSpans || curStyle != style) {
+        if (curText) f(curText, curStyle);
+        curText = substr; curStyle = style;
+      } else curText = curText + substr;
+    }
+    if (curText) f(curText, curStyle);
+  }
+
+  function highlightLine(cm, line, state) {
+    // A styles array always starts with a number identifying the
+    // mode/overlays that it is based on (for easy invalidation).
+    var st = [cm.state.modeGen];
+    // Compute the base array of styles
+    runMode(cm, line.text, cm.doc.mode, state, function(txt, style) {st.push(txt, style);});
+
+    // Run overlays, adjust style array.
+    for (var o = 0; o < cm.state.overlays.length; ++o) {
+      var overlay = cm.state.overlays[o], i = 1;
+      runMode(cm, line.text, overlay.mode, true, function(txt, style) {
+        var start = i, len = txt.length;
+        // Ensure there's a token end at the current position, and that i points at it
+        while (len) {
+          var cur = st[i], len_ = cur.length;
+          if (len_ <= len) {
+            len -= len_;
+          } else {
+            st.splice(i, 1, cur.slice(0, len), st[i+1], cur.slice(len));
+            len = 0;
+          }
+          i += 2;
+        }
+        if (!style) return;
+        if (overlay.opaque) {
+          st.splice(start, i - start, txt, style);
+          i = start + 2;
         } else {
-          var content = document.createDocumentFragment(), pos = 0;
-          while (true) {
-            specials.lastIndex = pos;
-            var m = specials.exec(text);
-            var skipped = m ? m.index - pos : text.length - pos;
-            if (skipped) {
-              content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
-              col += skipped;
-            }
-            if (!m) break;
-            pos += skipped + 1;
-            if (m[0] == "\t") {
-              var tabWidth = tabSize - col % tabSize;
-              content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
-              col += tabWidth;
-            } else {
-              var token = elt("span", "\u2022", "cm-invalidchar");
-              token.title = "\\u" + m[0].charCodeAt(0).toString(16);
-              content.appendChild(token);
-              col += 1;
-            }
+          for (; start < i; start += 2) {
+            var cur = st[start+1];
+            st[start+1] = cur ? cur + " " + style : style;
           }
         }
-        if (style) html.appendChild(elt("span", [content], style));
-        else html.appendChild(content);
-      }
-      var span = span_;
-      if (wrapAt != null) {
-        var outPos = 0, anchor = pre.anchor = elt("span");
-        span = function(html, text, style) {
-          var l = text.length;
-          if (wrapAt >= outPos && wrapAt < outPos + l) {
-            var cut = wrapAt - outPos;
-            if (cut) {
-              span_(html, text.slice(0, cut), style);
-              // See comment at the definition of spanAffectsWrapping
-              if (compensateForWrapping) {
-                var view = text.slice(cut - 1, cut + 1);
-                if (spanAffectsWrapping.test(view)) html.appendChild(elt("wbr"));
-                else if (!ie_lt8 && /\w\w/.test(view)) html.appendChild(document.createTextNode("\u200d"));
-              }
-            }
-            html.appendChild(anchor);
-            span_(anchor, opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
-            if (opera) span_(html, text.slice(cut + 1), style);
-            wrapAt--;
-            outPos += l;
-          } else {
-            outPos += l;
-            span_(html, text, style);
-            if (outPos == wrapAt && outPos == len) {
-              setTextContent(anchor, eolSpanContent);
-              html.appendChild(anchor);
-            }
-            // Stop outputting HTML when gone sufficiently far beyond measure
-            else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function(){};
-          }
-        };
-      }
-
-      var st = this.styles, allText = this.text, marked = this.markedSpans;
-      var len = allText.length;
-      function styleToClass(style) {
-        if (!style) return null;
-        return "cm-" + style.replace(/ +/g, " cm-");
+      });
+    }
+
+    return st;
+  }
+
+  function getLineStyles(cm, line) {
+    if (!line.styles || line.styles[0] != cm.state.modeGen)
+      line.styles = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
+    return line.styles;
+  }
+
+  // Lightweight form of highlight -- proceed over this line and
+  // update state, but don't save a style array.
+  function processLine(cm, line, state) {
+    var mode = cm.doc.mode;
+    var stream = new StringStream(line.text, cm.options.tabSize);
+    if (line.text == "" && mode.blankLine) mode.blankLine(state);
+    while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
+      mode.token(stream, state);
+      stream.start = stream.pos;
+    }
+  }
+
+  var styleToClassCache = {};
+  function styleToClass(style) {
+    if (!style) return null;
+    return styleToClassCache[style] ||
+      (styleToClassCache[style] = "cm-" + style.replace(/ +/g, " cm-"));
+  }
+
+  function lineContent(cm, realLine, measure) {
+    var merged, line = realLine, lineBefore, sawBefore, simple = true;
+    while (merged = collapsedSpanAtStart(line)) {
+      simple = false;
+      line = getLine(cm.doc, merged.find().from.line);
+      if (!lineBefore) lineBefore = line;
+    }
+
+    var builder = {pre: elt("pre"), col: 0, pos: 0, display: !measure,
+                   measure: null, addedOne: false, cm: cm};
+    if (line.textClass) builder.pre.className = line.textClass;
+
+    do {
+      builder.measure = line == realLine && measure;
+      builder.pos = 0;
+      builder.addToken = builder.measure ? buildTokenMeasure : buildToken;
+      if ((ie || webkit) && cm.getOption("lineWrapping"))
+        builder.addToken = buildTokenSplitSpaces(builder.addToken);
+      if (measure && sawBefore && line != realLine && !builder.addedOne) {
+        measure[0] = builder.pre.appendChild(zeroWidthElement(cm.display.measure));
+        builder.addedOne = true;
       }
-      if (!allText && wrapAt == null) {
-        span(pre, " ");
-      } else if (!marked || !marked.length) {
-        for (var i = 0, ch = 0; ch < len; i+=2) {
-          var str = st[i], style = st[i+1], l = str.length;
-          if (ch + l > len) str = str.slice(0, len - ch);
-          ch += l;
-          span(pre, str, styleToClass(style));
+      var next = insertLineContent(line, builder, getLineStyles(cm, line));
+      sawBefore = line == lineBefore;
+      if (next) {
+        line = getLine(cm.doc, next.to.line);
+        simple = false;
+      }
+    } while (next);
+
+    if (measure && !builder.addedOne)
+      measure[0] = builder.pre.appendChild(simple ? elt("span", "\u00a0") : zeroWidthElement(cm.display.measure));
+    if (!builder.pre.firstChild && !lineIsHidden(cm.doc, realLine))
+      builder.pre.appendChild(document.createTextNode("\u00a0"));
+
+    var order;
+    // Work around problem with the reported dimensions of single-char
+    // direction spans on IE (issue #1129). See also the comment in
+    // cursorCoords.
+    if (measure && ie && (order = getOrder(line))) {
+      var l = order.length - 1;
+      if (order[l].from == order[l].to) --l;
+      var last = order[l], prev = order[l - 1];
+      if (last.from + 1 == last.to && prev && last.level < prev.level) {
+        var span = measure[builder.pos - 1];
+        if (span) span.parentNode.insertBefore(span.measureRight = zeroWidthElement(cm.display.measure),
+                                               span.nextSibling);
+      }
+    }
+
+    signal(cm, "renderLine", cm, realLine, builder.pre);
+    return builder.pre;
+  }
+
+  var tokenSpecialChars = /[\t\u0000-\u0019\u00ad\u200b\u2028\u2029\uFEFF]/g;
+  function buildToken(builder, text, style, startStyle, endStyle) {
+    if (!text) return;
+    if (!tokenSpecialChars.test(text)) {
+      builder.col += text.length;
+      var content = document.createTextNode(text);
+    } else {
+      var content = document.createDocumentFragment(), pos = 0;
+      while (true) {
+        tokenSpecialChars.lastIndex = pos;
+        var m = tokenSpecialChars.exec(text);
+        var skipped = m ? m.index - pos : text.length - pos;
+        if (skipped) {
+          content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
+          builder.col += skipped;
         }
-      } else {
-        marked.sort(function(a, b) { return a.from - b.from; });
-        var pos = 0, i = 0, text = "", style, sg = 0;
-        var nextChange = marked[0].from || 0, marks = [], markpos = 0;
-        var advanceMarks = function() {
-          var m;
-          while (markpos < marked.length &&
-                 ((m = marked[markpos]).from == pos || m.from == null)) {
-            if (m.marker.type == "range") marks.push(m);
-            ++markpos;
-          }
-          nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
-          for (var i = 0; i < marks.length; ++i) {
-            var to = marks[i].to;
-            if (to == null) to = Infinity;
-            if (to == pos) marks.splice(i--, 1);
-            else nextChange = Math.min(to, nextChange);
-          }
-        };
-        var m = 0;
-        while (pos < len) {
-          if (nextChange == pos) advanceMarks();
-          var upto = Math.min(len, nextChange);
-          while (true) {
-            if (text) {
-              var end = pos + text.length;
-              var appliedStyle = style;
-              for (var j = 0; j < marks.length; ++j) {
-                var mark = marks[j];
-                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + mark.marker.style;
-                if (mark.marker.endStyle && mark.to === Math.min(end, upto)) appliedStyle += " " + mark.marker.endStyle;
-                if (mark.marker.startStyle && mark.from === pos) appliedStyle += " " + mark.marker.startStyle;
-              }
-              span(pre, end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
-              if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
-              pos = end;
-            }
-            text = st[i++]; style = styleToClass(st[i++]);
-          }
+        if (!m) break;
+        pos += skipped + 1;
+        if (m[0] == "\t") {
+          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
+          content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
+          builder.col += tabWidth;
+        } else {
+          var token = elt("span", "\u2022", "cm-invalidchar");
+          token.title = "\\u" + m[0].charCodeAt(0).toString(16);
+          content.appendChild(token);
+          builder.col += 1;
         }
       }
-      return pre;
-    },
-    cleanUp: function() {
-      this.parent = null;
-      detachMarkedSpans(this);
-    }
-  };
-
-  // Data structure that holds the sequence of lines.
+    }
+    if (style || startStyle || endStyle || builder.measure) {
+      var fullStyle = style || "";
+      if (startStyle) fullStyle += startStyle;
+      if (endStyle) fullStyle += endStyle;
+      return builder.pre.appendChild(elt("span", [content], fullStyle));
+    }
+    builder.pre.appendChild(content);
+  }
+
+  function buildTokenMeasure(builder, text, style, startStyle, endStyle) {
+    var wrapping = builder.cm.options.lineWrapping;
+    for (var i = 0; i < text.length; ++i) {
+      var ch = text.charAt(i), start = i == 0;
+      if (ch >= "\ud800" && ch < "\udbff" && i < text.length - 1) {
+        ch = text.slice(i, i + 2);
+        ++i;
+      } else if (i && wrapping &&
+                 spanAffectsWrapping.test(text.slice(i - 1, i + 1))) {
+        builder.pre.appendChild(elt("wbr"));
+      }
+      var span = builder.measure[builder.pos] =
+        buildToken(builder, ch, style,
+                   start && startStyle, i == text.length - 1 && endStyle);
+      // In IE single-space nodes wrap differently than spaces
+      // embedded in larger text nodes, except when set to
+      // white-space: normal (issue #1268).
+      if (ie && wrapping && ch == " " && i && !/\s/.test(text.charAt(i - 1)) &&
+          i < text.length - 1 && !/\s/.test(text.charAt(i + 1)))
+        span.style.whiteSpace = "normal";
+      builder.pos += ch.length;
+    }
+    if (text.length) builder.addedOne = true;
+  }
+
+  function buildTokenSplitSpaces(inner) {
+    function split(old) {
+      var out = " ";
+      for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
+      out += " ";
+      return out;
+    }
+    return function(builder, text, style, startStyle, endStyle) {
+      return inner(builder, text.replace(/ {3,}/, split), style, startStyle, endStyle);
+    };
+  }
+
+  function buildCollapsedSpan(builder, size, widget) {
+    if (widget) {
+      if (!builder.display) widget = widget.cloneNode(true);
+      builder.pre.appendChild(widget);
+      if (builder.measure && size) {
+        builder.measure[builder.pos] = widget;
+        builder.addedOne = true;
+      }
+    }
+    builder.pos += size;
+  }
+
+  // Outputs a number of spans to make up a line, taking highlighting
+  // and marked text into account.
+  function insertLineContent(line, builder, styles) {
+    var spans = line.markedSpans;
+    if (!spans) {
+      for (var i = 1; i < styles.length; i+=2)
+        builder.addToken(builder, styles[i], styleToClass(styles[i+1]));
+      return;
+    }
+
+    var allText = line.text, len = allText.length;
+    var pos = 0, i = 1, text = "", style;
+    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed;
+    for (;;) {
+      if (nextChange == pos) { // Update current marker set
+        spanStyle = spanEndStyle = spanStartStyle = "";
+        collapsed = null; nextChange = Infinity;
+        var foundBookmark = null;
+        for (var j = 0; j < spans.length; ++j) {
+          var sp = spans[j], m = sp.marker;
+          if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
+            if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }
+            if (m.className) spanStyle += " " + m.className;
+            if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
+            if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
+            if (m.collapsed && (!collapsed || collapsed.marker.width < m.width))
+              collapsed = sp;
+          } else if (sp.from > pos && nextChange > sp.from) {
+            nextChange = sp.from;
+          }
+          if (m.type == "bookmark" && sp.from == pos && m.replacedWith)
+            foundBookmark = m.replacedWith;
+        }
+        if (collapsed && (collapsed.from || 0) == pos) {
+          buildCollapsedSpan(builder, (collapsed.to == null ? len : collapsed.to) - pos,
+                             collapsed.from != null && collapsed.marker.replacedWith);
+          if (collapsed.to == null) return collapsed.marker.find();
+        }
+        if (foundBookmark && !collapsed) buildCollapsedSpan(builder, 0, foundBookmark);
+      }
+      if (pos >= len) break;
+
+      var upto = Math.min(len, nextChange);
+      while (true) {
+        if (text) {
+          var end = pos + text.length;
+          if (!collapsed) {
+            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
+            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
+                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "");
+          }
+          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
+          pos = end;
+          spanStartStyle = "";
+        }
+        text = styles[i++]; style = styleToClass(styles[i++]);
+      }
+    }
+  }
+
+  // DOCUMENT DATA STRUCTURE
+
+  function updateDoc(doc, change, markedSpans, selAfter, estimateHeight) {
+    function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
+    function update(line, text, spans) {
+      updateLine(line, text, spans, estimateHeight);
+      signalLater(line, "change", line, change);
+    }
+
+    var from = change.from, to = change.to, text = change.text;
+    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
+    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
+
+    // First adjust the line structure
+    if (from.ch == 0 && to.ch == 0 && lastText == "") {
+      // This is a whole-line replace. Treated specially to make
+      // sure line objects move the way they are supposed to.
+      for (var i = 0, e = text.length - 1, added = []; i < e; ++i)
+        added.push(makeLine(text[i], spansFor(i), estimateHeight));
+      update(lastLine, lastLine.text, lastSpans);
+      if (nlines) doc.remove(from.line, nlines);
+      if (added.length) doc.insert(from.line, added);
+    } else if (firstLine == lastLine) {
+      if (text.length == 1) {
+        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
+      } else {
+        for (var added = [], i = 1, e = text.length - 1; i < e; ++i)
+          added.push(makeLine(text[i], spansFor(i), estimateHeight));
+        added.push(makeLine(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
+        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+        doc.insert(from.line + 1, added);
+      }
+    } else if (text.length == 1) {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
+      doc.remove(from.line + 1, nlines);
+    } else {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
+      for (var i = 1, e = text.length - 1, added = []; i < e; ++i)
+        added.push(makeLine(text[i], spansFor(i), estimateHeight));
+      if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
+      doc.insert(from.line + 1, added);
+    }
+
+    signalLater(doc, "change", doc, change);
+    setSelection(doc, selAfter.anchor, selAfter.head, null, true);
+  }
+
   function LeafChunk(lines) {
     this.lines = lines;
     this.parent = null;
@@ -2706,22 +4375,22 @@
     }
     this.height = height;
   }
+
   LeafChunk.prototype = {
     chunkSize: function() { return this.lines.length; },
-    remove: function(at, n, callbacks) {
+    removeInner: function(at, n) {
       for (var i = at, e = at + n; i < e; ++i) {
         var line = this.lines[i];
         this.height -= line.height;
-        line.cleanUp();
-        if (line.handlers)
-          for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
+        cleanUpLine(line);
+        signalLater(line, "delete");
       }
       this.lines.splice(at, n);
     },
     collapse: function(lines) {
       lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
     },
-    insertHeight: function(at, lines, height) {
+    insertInner: function(at, lines, height) {
       this.height += height;
       this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
       for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
@@ -2731,6 +4400,7 @@
         if (op(this.lines[at])) return true;
     }
   };
+
   function BranchChunk(children) {
     this.children = children;
     var size = 0, height = 0;
@@ -2743,15 +4413,16 @@
     this.height = height;
     this.parent = null;
   }
+
   BranchChunk.prototype = {
     chunkSize: function() { return this.size; },
-    remove: function(at, n, callbacks) {
+    removeInner: function(at, n) {
       this.size -= n;
       for (var i = 0; i < this.children.length; ++i) {
         var child = this.children[i], sz = child.chunkSize();
         if (at < sz) {
           var rm = Math.min(n, sz - at), oldHeight = child.height;
-          child.remove(at, rm, callbacks);
+          child.removeInner(at, rm);
           this.height -= oldHeight - child.height;
           if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
           if ((n -= rm) == 0) break;
@@ -2768,18 +4439,13 @@
     collapse: function(lines) {
       for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
     },
-    insert: function(at, lines) {
-      var height = 0;
-      for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
-      this.insertHeight(at, lines, height);
-    },
-    insertHeight: function(at, lines, height) {
+    insertInner: function(at, lines, height) {
       this.size += lines.length;
       this.height += height;
       for (var i = 0, e = this.children.length; i < e; ++i) {
         var child = this.children[i], sz = child.chunkSize();
         if (at <= sz) {
-          child.insertHeight(at, lines, height);
+          child.insertInner(at, lines, height);
           if (child.lines && child.lines.length > 50) {
             while (child.lines.length > 50) {
               var spilled = child.lines.splice(child.lines.length - 25, 25);
@@ -2816,7 +4482,6 @@
       } while (me.children.length > 10);
       me.parent.maybeSpill();
     },
-    iter: function(from, to, op) { this.iterN(from, to - from, op); },
     iterN: function(at, n, op) {
       for (var i = 0, e = this.children.length; i < e; ++i) {
         var child = this.children[i], sz = child.chunkSize();
@@ -2830,7 +4495,268 @@
     }
   };
 
-  function getLineAt(chunk, n) {
+  var nextDocId = 0;
+  var Doc = CodeMirror.Doc = function(text, mode, firstLine) {
+    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);
+    if (firstLine == null) firstLine = 0;
+
+    BranchChunk.call(this, [new LeafChunk([makeLine("", null)])]);
+    this.first = firstLine;
+    this.scrollTop = this.scrollLeft = 0;
+    this.cantEdit = false;
+    this.history = makeHistory();
+    this.frontier = firstLine;
+    var start = Pos(firstLine, 0);
+    this.sel = {from: start, to: start, head: start, anchor: start, shift: false, extend: false, goalColumn: null};
+    this.id = ++nextDocId;
+    this.modeOption = mode;
+
+    if (typeof text == "string") text = splitLines(text);
+    updateDoc(this, {from: start, to: start, text: text}, null, {head: start, anchor: start});
+  };
+
+  Doc.prototype = createObj(BranchChunk.prototype, {
+    iter: function(from, to, op) {
+      if (op) this.iterN(from - this.first, to - from, op);
+      else this.iterN(this.first, this.first + this.size, from);
+    },
+
+    insert: function(at, lines) {
+      var height = 0;
+      for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
+      this.insertInner(at - this.first, lines, height);
+    },
+    remove: function(at, n) { this.removeInner(at - this.first, n); },
+
+    getValue: function(lineSep) {
+      var lines = getLines(this, this.first, this.first + this.size);
+      if (lineSep === false) return lines;
+      return lines.join(lineSep || "\n");
+    },
+    setValue: function(code) {
+      var top = Pos(this.first, 0), last = this.first + this.size - 1;
+      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
+                        text: splitLines(code), origin: "setValue"},
+                 {head: top, anchor: top}, true);
+    },
+    replaceRange: function(code, from, to, origin) {
+      from = clipPos(this, from);
+      to = to ? clipPos(this, to) : from;
+      replaceRange(this, code, from, to, origin);
+    },
+    getRange: function(from, to, lineSep) {
+      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
+      if (lineSep === false) return lines;
+      return lines.join(lineSep || "\n");
+    },
+
+    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
+    setLine: function(line, text) {
+      if (isLine(this, line))
+        replaceRange(this, text, Pos(line, 0), clipPos(this, Pos(line)));
+    },
+    removeLine: function(line) {
+      if (line) replaceRange(this, "", clipPos(this, Pos(line - 1)), clipPos(this, Pos(line)));
+      else replaceRange(this, "", Pos(0, 0), clipPos(this, Pos(1, 0)));
+    },
+
+    getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
+    getLineNumber: function(line) {return lineNo(line);},
+
+    lineCount: function() {return this.size;},
+    firstLine: function() {return this.first;},
+    lastLine: function() {return this.first + this.size - 1;},
+
+    clipPos: function(pos) {return clipPos(this, pos);},
+
+    getCursor: function(start) {
+      var sel = this.sel, pos;
+      if (start == null || start == "head") pos = sel.head;
+      else if (start == "anchor") pos = sel.anchor;
+      else if (start == "end" || start === false) pos = sel.to;
+      else pos = sel.from;
+      return copyPos(pos);
+    },
+    somethingSelected: function() {return !posEq(this.sel.head, this.sel.anchor);},
+
+    setCursor: docOperation(function(line, ch, extend) {
+      var pos = clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line);
+      if (extend) extendSelection(this, pos);
+      else setSelection(this, pos, pos);
+    }),
+    setSelection: docOperation(function(anchor, head) {
+      setSelection(this, clipPos(this, anchor), clipPos(this, head || anchor));
+    }),
+    extendSelection: docOperation(function(from, to) {
+      extendSelection(this, clipPos(this, from), to && clipPos(this, to));
+    }),
+
+    getSelection: function(lineSep) {return this.getRange(this.sel.from, this.sel.to, lineSep);},
+    replaceSelection: function(code, collapse, origin) {
+      makeChange(this, {from: this.sel.from, to: this.sel.to, text: splitLines(code), origin: origin}, collapse || "around");
+    },
+    undo: docOperation(function() {makeChangeFromHistory(this, "undo");}),
+    redo: docOperation(function() {makeChangeFromHistory(this, "redo");}),
+
+    setExtending: function(val) {this.sel.extend = val;},
+
+    historySize: function() {
+      var hist = this.history;
+      return {undo: hist.done.length, redo: hist.undone.length};
+    },
+    clearHistory: function() {this.history = makeHistory();},
+
+    markClean: function() {
+      this.history.dirtyCounter = 0;
+      this.history.lastOp = this.history.lastOrigin = null;
+    },
+    isClean: function () {return this.history.dirtyCounter == 0;},
+
+    getHistory: function() {
+      return {done: copyHistoryArray(this.history.done),
+              undone: copyHistoryArray(this.history.undone)};
+    },
+    setHistory: function(histData) {
+      var hist = this.history = makeHistory();
+      hist.done = histData.done.slice(0);
+      hist.undone = histData.undone.slice(0);
+    },
+
+    markText: function(from, to, options) {
+      return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
+    },
+    setBookmark: function(pos, options) {
+      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
+                      insertLeft: options && options.insertLeft};
+      pos = clipPos(this, pos);
+      return markText(this, pos, pos, realOpts, "bookmark");
+    },
+    findMarksAt: function(pos) {
+      pos = clipPos(this, pos);
+      var markers = [], spans = getLine(this, pos.line).markedSpans;
+      if (spans) for (var i = 0; i < spans.length; ++i) {
+        var span = spans[i];
+        if ((span.from == null || span.from <= pos.ch) &&
+            (span.to == null || span.to >= pos.ch))
+          markers.push(span.marker.parent || span.marker);
+      }
+      return markers;
+    },
+    getAllMarks: function() {
+      var markers = [];
+      this.iter(function(line) {
+        var sps = line.markedSpans;
+        if (sps) for (var i = 0; i < sps.length; ++i)
+          if (sps[i].from != null) markers.push(sps[i].marker);
+      });
+      return markers;
+    },
+
+    posFromIndex: function(off) {
+      var ch, lineNo = this.first;
+      this.iter(function(line) {
+        var sz = line.text.length + 1;
+        if (sz > off) { ch = off; return true; }
+        off -= sz;
+        ++lineNo;
+      });
+      return clipPos(this, Pos(lineNo, ch));
+    },
+    indexFromPos: function (coords) {
+      coords = clipPos(this, coords);
+      var index = coords.ch;
+      if (coords.line < this.first || coords.ch < 0) return 0;
+      this.iter(this.first, coords.line, function (line) {
+        index += line.text.length + 1;
+      });
+      return index;
+    },
+
+    copy: function(copyHistory) {
+      var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
+      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
+      doc.sel = {from: this.sel.from, to: this.sel.to, head: this.sel.head, anchor: this.sel.anchor,
+                 shift: this.sel.shift, extend: false, goalColumn: this.sel.goalColumn};
+      if (copyHistory) {
+        doc.history.undoDepth = this.history.undoDepth;
+        doc.setHistory(this.getHistory());
+      }
+      return doc;
+    },
+
+    linkedDoc: function(options) {
+      if (!options) options = {};
+      var from = this.first, to = this.first + this.size;
+      if (options.from != null && options.from > from) from = options.from;
+      if (options.to != null && options.to < to) to = options.to;
+      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
+      if (options.sharedHist) copy.history = this.history;
+      (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
+      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
+      return copy;
+    },
+    unlinkDoc: function(other) {
+      if (other instanceof CodeMirror) other = other.doc;
+      if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
+        var link = this.linked[i];
+        if (link.doc != other) continue;
+        this.linked.splice(i, 1);
+        other.unlinkDoc(this);
+        break;
+      }
+      // If the histories were shared, split them again
+      if (other.history == this.history) {
+        var splitIds = [other.id];
+        linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
+        other.history = makeHistory();
+        other.history.done = copyHistoryArray(this.history.done, splitIds);
+        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
+      }
+    },
+    iterLinkedDocs: function(f) {linkedDocs(this, f);},
+
+    getMode: function() {return this.mode;},
+    getEditor: function() {return this.cm;}
+  });
+
+  Doc.prototype.eachLine = Doc.prototype.iter;
+
+  // The Doc methods that should be available on CodeMirror instances
+  var dontDelegate = "iter insert remove copy getEditor".split(" ");
+  for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
+    CodeMirror.prototype[prop] = (function(method) {
+      return function() {return method.apply(this.doc, arguments);};
+    })(Doc.prototype[prop]);
+
+  function linkedDocs(doc, f, sharedHistOnly) {
+    function propagate(doc, skip, sharedHist) {
+      if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
+        var rel = doc.linked[i];
+        if (rel.doc == skip) continue;
+        var shared = sharedHist && rel.sharedHist;
+        if (sharedHistOnly && !shared) continue;
+        f(rel.doc, shared);
+        propagate(rel.doc, doc, shared);
+      }
+    }
+    propagate(doc, null, true);
+  }
+
+  function attachDoc(cm, doc) {
+    if (doc.cm) throw new Error("This document is already in use.");
+    cm.doc = doc;
+    doc.cm = cm;
+    estimateLineHeights(cm);
+    loadMode(cm);
+    if (!cm.options.lineWrapping) computeMaxLength(cm);
+    cm.options.mode = doc.modeOption;
+    regChange(cm);
+  }
+
+  // LINE UTILITIES
+
+  function getLine(chunk, n) {
+    n -= chunk.first;
     while (!chunk.lines) {
       for (var i = 0;; ++i) {
         var child = chunk.children[i], sz = child.chunkSize();
@@ -2840,19 +4766,43 @@
     }
     return chunk.lines[n];
   }
+
+  function getBetween(doc, start, end) {
+    var out = [], n = start.line;
+    doc.iter(start.line, end.line + 1, function(line) {
+      var text = line.text;
+      if (n == end.line) text = text.slice(0, end.ch);
+      if (n == start.line) text = text.slice(start.ch);
+      out.push(text);
+      ++n;
+    });
+    return out;
+  }
+  function getLines(doc, from, to) {
+    var out = [];
+    doc.iter(from, to, function(line) { out.push(line.text); });
+    return out;
+  }
+
+  function updateLineHeight(line, height) {
+    var diff = height - line.height;
+    for (var n = line; n; n = n.parent) n.height += diff;
+  }
+
   function lineNo(line) {
     if (line.parent == null) return null;
     var cur = line.parent, no = indexOf(cur.lines, line);
     for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
-      for (var i = 0, e = chunk.children.length; ; ++i) {
+      for (var i = 0;; ++i) {
         if (chunk.children[i] == cur) break;
         no += chunk.children[i].chunkSize();
       }
     }
-    return no;
-  }
+    return no + cur.first;
+  }
+
   function lineAtHeight(chunk, h) {
-    var n = 0;
+    var n = chunk.first;
     outer: do {
       for (var i = 0, e = chunk.children.length; i < e; ++i) {
         var child = chunk.children[i], ch = child.height;
@@ -2869,58 +4819,197 @@
     }
     return n + i;
   }
-  function heightAtLine(chunk, n) {
-    var h = 0;
-    outer: do {
-      for (var i = 0, e = chunk.children.length; i < e; ++i) {
-        var child = chunk.children[i], sz = child.chunkSize();
-        if (n < sz) { chunk = child; continue outer; }
-        n -= sz;
-        h += child.height;
+
+  function heightAtLine(cm, lineObj) {
+    lineObj = visualLine(cm.doc, lineObj);
+
+    var h = 0, chunk = lineObj.parent;
+    for (var i = 0; i < chunk.lines.length; ++i) {
+      var line = chunk.lines[i];
+      if (line == lineObj) break;
+      else h += line.height;
+    }
+    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
+      for (var i = 0; i < p.children.length; ++i) {
+        var cur = p.children[i];
+        if (cur == chunk) break;
+        else h += cur.height;
       }
-      return h;
-    } while (!chunk.lines);
-    for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
+    }
     return h;
   }
 
-  // The history object 'chunks' changes that are made close together
-  // and at almost the same time into bigger undoable units.
-  function History() {
-    this.time = 0;
-    this.done = []; this.undone = [];
-    this.compound = 0;
-    this.closed = false;
-  }
-  History.prototype = {
-    addChange: function(start, added, old) {
-      this.undone.length = 0;
-      var time = +new Date, cur = lst(this.done), last = cur && lst(cur);
-      var dtime = time - this.time;
-
-      if (cur && !this.closed && this.compound) {
-        cur.push({start: start, added: added, old: old});
-      } else if (dtime > 400 || !last || this.closed ||
-                 last.start > start + old.length || last.start + last.added < start) {
-        this.done.push([{start: start, added: added, old: old}]);
-        this.closed = false;
+  function getOrder(line) {
+    var order = line.order;
+    if (order == null) order = line.order = bidiOrdering(line.text);
+    return order;
+  }
+
+  // HISTORY
+
+  function makeHistory() {
+    return {
+      // Arrays of history events. Doing something adds an event to
+      // done and clears undo. Undoing moves events from done to
+      // undone, redoing moves them in the other direction.
+      done: [], undone: [], undoDepth: Infinity,
+      // Used to track when changes can be merged into a single undo
+      // event
+      lastTime: 0, lastOp: null, lastOrigin: null,
+      // Used by the isClean() method
+      dirtyCounter: 0
+    };
+  }
+
+  function attachLocalSpans(doc, change, from, to) {
+    var existing = change["spans_" + doc.id], n = 0;
+    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
+      if (line.markedSpans)
+        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
+      ++n;
+    });
+  }
+
+  function historyChangeFromChange(doc, change) {
+    var histChange = {from: change.from, to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
+    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
+    linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
+    return histChange;
+  }
+
+  function addToHistory(doc, change, selAfter, opId) {
+    var hist = doc.history;
+    hist.undone.length = 0;
+    var time = +new Date, cur = lst(hist.done);
+
+    if (cur &&
+        (hist.lastOp == opId ||
+         hist.lastOrigin == change.origin && change.origin &&
+         ((change.origin.charAt(0) == "+" && doc.cm && hist.lastTime > time - doc.cm.options.historyEventDelay) ||
+          change.origin.charAt(0) == "*"))) {
+      // Merge this change into the last event
+      var last = lst(cur.changes);
+      if (posEq(change.from, change.to) && posEq(change.from, last.to)) {
+        // Optimized case for simple insertion -- don't want to add
+        // new changesets for every character typed
+        last.to = changeEnd(change);
       } else {
-        var startBefore = Math.max(0, last.start - start),
-            endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
-        for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
-        for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
-        if (startBefore) last.start = start;
-        last.added += added - (old.length - startBefore - endAfter);
+        // Add new sub-event
+        cur.changes.push(historyChangeFromChange(doc, change));
+      }
+      cur.anchorAfter = selAfter.anchor; cur.headAfter = selAfter.head;
+    } else {
+      // Can not be merged, start a new event.
+      cur = {changes: [historyChangeFromChange(doc, change)],
+             anchorBefore: doc.sel.anchor, headBefore: doc.sel.head,
+             anchorAfter: selAfter.anchor, headAfter: selAfter.head};
+      hist.done.push(cur);
+      while (hist.done.length > hist.undoDepth)
+        hist.done.shift();
+      if (hist.dirtyCounter < 0)
+        // The user has made a change after undoing past the last clean state.
+        // We can never get back to a clean state now until markClean() is called.
+        hist.dirtyCounter = NaN;
+      else
+        hist.dirtyCounter++;
+    }
+    hist.lastTime = time;
+    hist.lastOp = opId;
+    hist.lastOrigin = change.origin;
+  }
+
+  function removeClearedSpans(spans) {
+    if (!spans) return null;
+    for (var i = 0, out; i < spans.length; ++i) {
+      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
+      else if (out) out.push(spans[i]);
+    }
+    return !out ? spans : out.length ? out : null;
+  }
+
+  function getOldSpans(doc, change) {
+    var found = change["spans_" + doc.id];
+    if (!found) return null;
+    for (var i = 0, nw = []; i < change.text.length; ++i)
+      nw.push(removeClearedSpans(found[i]));
+    return nw;
+  }
+
+  // Used both to provide a JSON-safe object in .getHistory, and, when
+  // detaching a document, to split the history in two
+  function copyHistoryArray(events, newGroup) {
+    for (var i = 0, copy = []; i < events.length; ++i) {
+      var event = events[i], changes = event.changes, newChanges = [];
+      copy.push({changes: newChanges, anchorBefore: event.anchorBefore, headBefore: event.headBefore,
+                 anchorAfter: event.anchorAfter, headAfter: event.headAfter});
+      for (var j = 0; j < changes.length; ++j) {
+        var change = changes[j], m;
+        newChanges.push({from: change.from, to: change.to, text: change.text});
+        if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
+          if (indexOf(newGroup, Number(m[1])) > -1) {
+            lst(newChanges)[prop] = change[prop];
+            delete change[prop];
+          }
+        }
       }
-      this.time = time;
-    },
-    startCompound: function() {
-      if (!this.compound++) this.closed = true;
-    },
-    endCompound: function() {
-      if (!--this.compound) this.closed = true;
-    }
-  };
+    }
+    return copy;
+  }
+
+  // Rebasing/resetting history to deal with externally-sourced changes
+
+  function rebaseHistSel(pos, from, to, diff) {
+    if (to < pos.line) {
+      pos.line += diff;
+    } else if (from < pos.line) {
+      pos.line = from;
+      pos.ch = 0;
+    }
+  }
+
+  // Tries to rebase an array of history events given a change in the
+  // document. If the change touches the same lines as the event, the
+  // event, and everything 'behind' it, is discarded. If the change is
+  // before the event, the event's positions are updated. Uses a
+  // copy-on-write scheme for the positions, to avoid having to
+  // reallocate them all on every rebase, but also avoid problems with
+  // shared position objects being unsafely updated.
+  function rebaseHistArray(array, from, to, diff) {
+    for (var i = 0; i < array.length; ++i) {
+      var sub = array[i], ok = true;
+      for (var j = 0; j < sub.changes.length; ++j) {
+        var cur = sub.changes[j];
+        if (!sub.copied) { cur.from = copyPos(cur.from); cur.to = copyPos(cur.to); }
+        if (to < cur.from.line) {
+          cur.from.line += diff;
+          cur.to.line += diff;
+        } else if (from <= cur.to.line) {
+          ok = false;
+          break;
+        }
+      }
+      if (!sub.copied) {
+        sub.anchorBefore = copyPos(sub.anchorBefore); sub.headBefore = copyPos(sub.headBefore);
+        sub.anchorAfter = copyPos(sub.anchorAfter); sub.readAfter = copyPos(sub.headAfter);
+        sub.copied = true;
+      }
+      if (!ok) {
+        array.splice(0, i + 1);
+        i = 0;
+      } else {
+        rebaseHistSel(sub.anchorBefore); rebaseHistSel(sub.headBefore);
+        rebaseHistSel(sub.anchorAfter); rebaseHistSel(sub.headAfter);
+      }
+    }
+  }
+
+  function rebaseHist(hist, change) {
+    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
+    rebaseHistArray(hist.done, from, to, diff);
+    rebaseHistArray(hist.undone, from, to, diff);
+  }
+
+  // EVENT OPERATORS
 
   function stopMethod() {e_stop(this);}
   // Ensure an event has a stop method.
@@ -2954,96 +5043,95 @@
     return b;
   }
 
-  // Allow 3rd-party code to override event properties by adding an override
-  // object to an event object.
-  function e_prop(e, prop) {
-    var overridden = e.override && e.override.hasOwnProperty(prop);
-    return overridden ? e.override[prop] : e[prop];
-  }
-
-  // Event handler registration. If disconnect is true, it'll return a
-  // function that unregisters the handler.
-  function connect(node, type, handler, disconnect) {
-    if (typeof node.addEventListener == "function") {
-      node.addEventListener(type, handler, false);
-      if (disconnect) return function() {node.removeEventListener(type, handler, false);};
-    } else {
-      var wrapHandler = function(event) {handler(event || window.event);};
-      node.attachEvent("on" + type, wrapHandler);
-      if (disconnect) return function() {node.detachEvent("on" + type, wrapHandler);};
-    }
-  }
-  CodeMirror.connect = connect;
+  // EVENT HANDLING
+
+  function on(emitter, type, f) {
+    if (emitter.addEventListener)
+      emitter.addEventListener(type, f, false);
+    else if (emitter.attachEvent)
+      emitter.attachEvent("on" + type, f);
+    else {
+      var map = emitter._handlers || (emitter._handlers = {});
+      var arr = map[type] || (map[type] = []);
+      arr.push(f);
+    }
+  }
+
+  function off(emitter, type, f) {
+    if (emitter.removeEventListener)
+      emitter.removeEventListener(type, f, false);
+    else if (emitter.detachEvent)
+      emitter.detachEvent("on" + type, f);
+    else {
+      var arr = emitter._handlers && emitter._handlers[type];
+      if (!arr) return;
+      for (var i = 0; i < arr.length; ++i)
+        if (arr[i] == f) { arr.splice(i, 1); break; }
+    }
+  }
+
+  function signal(emitter, type /*, values...*/) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    if (!arr) return;
+    var args = Array.prototype.slice.call(arguments, 2);
+    for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
+  }
+
+  var delayedCallbacks, delayedCallbackDepth = 0;
+  function signalLater(emitter, type /*, values...*/) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    if (!arr) return;
+    var args = Array.prototype.slice.call(arguments, 2);
+    if (!delayedCallbacks) {
+      ++delayedCallbackDepth;
+      delayedCallbacks = [];
+      setTimeout(fireDelayed, 0);
+    }
+    function bnd(f) {return function(){f.apply(null, args);};};
+    for (var i = 0; i < arr.length; ++i)
+      delayedCallbacks.push(bnd(arr[i]));
+  }
+
+  function fireDelayed() {
+    --delayedCallbackDepth;
+    var delayed = delayedCallbacks;
+    delayedCallbacks = null;
+    for (var i = 0; i < delayed.length; ++i) delayed[i]();
+  }
+
+  function hasHandler(emitter, type) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    return arr && arr.length > 0;
+  }
+
+  CodeMirror.on = on; CodeMirror.off = off; CodeMirror.signal = signal;
+
+  // MISC UTILITIES
+
+  // Number of pixels added to scroller and sizer to hide scrollbar
+  var scrollerCutOff = 30;
+
+  // Returned or thrown by various protocols to signal 'I'm not
+  // handling this'.
+  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
 
   function Delayed() {this.id = null;}
   Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
 
-  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
-
-  // Detect drag-and-drop
-  var dragAndDrop = function() {
-    // There is *some* kind of drag-and-drop support in IE6-8, but I
-    // couldn't get it to work yet.
-    if (ie_lt9) return false;
-    var div = elt('div');
-    return "draggable" in div || "dragDrop" in div;
-  }();
-
-  // Feature-detect whether newlines in textareas are converted to \r\n
-  var lineSep = function () {
-    var te = elt("textarea");
-    te.value = "foo\nbar";
-    if (te.value.indexOf("\r") > -1) return "\r\n";
-    return "\n";
-  }();
-
-  // For a reason I have yet to figure out, some browsers disallow
-  // word wrapping between certain characters *only* if a new inline
-  // element is started between them. This makes it hard to reliably
-  // measure the position of things, since that requires inserting an
-  // extra span. This terribly fragile set of regexps matches the
-  // character combinations that suffer from this phenomenon on the
-  // various browsers.
-  var spanAffectsWrapping = /^$/; // Won't match any two-character string
-  if (gecko) spanAffectsWrapping = /$'/;
-  else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
-  else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;
-
   // Counts the column offset in a string, taking tabs into account.
   // Used mostly to find indentation.
-  function countColumn(string, end, tabSize) {
+  function countColumn(string, end, tabSize, startIndex, startValue) {
     if (end == null) {
       end = string.search(/[^\s\u00a0]/);
       if (end == -1) end = string.length;
     }
-    for (var i = 0, n = 0; i < end; ++i) {
+    for (var i = startIndex || 0, n = startValue || 0; i < end; ++i) {
       if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
       else ++n;
     }
     return n;
   }
-
-  function eltOffset(node, screen) {
-    // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
-    // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
-    try { var box = node.getBoundingClientRect(); box = { top: box.top, left: box.left }; }
-    catch(e) { box = {top: 0, left: 0}; }
-    if (!screen) {
-      // Get the toplevel scroll, working around browser differences.
-      if (window.pageYOffset == null) {
-        var t = document.documentElement || document.body.parentNode;
-        if (t.scrollTop == null) t = document.body;
-        box.top += t.scrollTop; box.left += t.scrollLeft;
-      } else {
-        box.top += window.pageYOffset; box.left += window.pageXOffset;
-      }
-    }
-    return box;
-  }
-
-  function eltText(node) {
-    return node.textContent || node.innerText || node.nodeValue || "";
-  }
+  CodeMirror.countColumn = countColumn;
 
   var spaceStrs = [""];
   function spaceStr(n) {
@@ -3061,10 +5149,51 @@
     } else node.select();
   }
 
-  // Operations on {line, ch} objects.
-  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
-  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
-  function copyPos(x) {return {line: x.line, ch: x.ch};}
+  function indexOf(collection, elt) {
+    if (collection.indexOf) return collection.indexOf(elt);
+    for (var i = 0, e = collection.length; i < e; ++i)
+      if (collection[i] == elt) return i;
+    return -1;
+  }
+
+  function createObj(base, props) {
+    function Obj() {}
+    Obj.prototype = base;
+    var inst = new Obj();
+    if (props) copyObj(props, inst);
+    return inst;
+  }
+
+  function copyObj(obj, target) {
+    if (!target) target = {};
+    for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
+    return target;
+  }
+
+  function emptyArray(size) {
+    for (var a = [], i = 0; i < size; ++i) a.push(undefined);
+    return a;
+  }
+
+  function bind(f) {
+    var args = Array.prototype.slice.call(arguments, 1);
+    return function(){return f.apply(null, args);};
+  }
+
+  var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc]/;
+  function isWordChar(ch) {
+    return /\w/.test(ch) || ch > "\x80" &&
+      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
+  }
+
+  function isEmpty(obj) {
+    for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
+    return true;
+  }
+
+  var isExtendingChar = /[\u0300-\u036F\u0483-\u0487\u0488-\u0489\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7-\u06E8\u06EA-\u06ED\uA66F\uA670-\uA672\uA674-\uA67D\uA69F\udc00-\udfff]/;
+
+  // DOM UTILITIES
 
   function elt(tag, content, className, style) {
     var e = document.createElement(tag);
@@ -3074,13 +5203,17 @@
     else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
     return e;
   }
+
   function removeChildren(e) {
-    e.innerHTML = "";
+    for (var count = e.childNodes.length; count > 0; --count)
+      e.removeChild(e.firstChild);
     return e;
   }
+
   function removeChildrenAndAdd(parent, e) {
-    removeChildren(parent).appendChild(e);
-  }
+    return removeChildren(parent).appendChild(e);
+  }
+
   function setTextContent(e, str) {
     if (ie_lt9) {
       e.innerHTML = "";
@@ -3088,26 +5221,54 @@
     } else e.textContent = str;
   }
 
-  // Used to position the cursor after an undo/redo by finding the
-  // last edited character.
-  function editEnd(from, to) {
-    if (!to) return 0;
-    if (!from) return to.length;
-    for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
-      if (from.charAt(i) != to.charAt(j)) break;
-    return j + 1;
-  }
-
-  function indexOf(collection, elt) {
-    if (collection.indexOf) return collection.indexOf(elt);
-    for (var i = 0, e = collection.length; i < e; ++i)
-      if (collection[i] == elt) return i;
-    return -1;
-  }
-  var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc]/;
-  function isWordChar(ch) {
-    return /\w/.test(ch) || ch > "\x80" &&
-      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
+  function getRect(node) {
+    return node.getBoundingClientRect();
+  }
+  CodeMirror.replaceGetRect = function(f) { getRect = f; };
+
+  // FEATURE DETECTION
+
+  // Detect drag-and-drop
+  var dragAndDrop = function() {
+    // There is *some* kind of drag-and-drop support in IE6-8, but I
+    // couldn't get it to work yet.
+    if (ie_lt9) return false;
+    var div = elt('div');
+    return "draggable" in div || "dragDrop" in div;
+  }();
+
+  // For a reason I have yet to figure out, some browsers disallow
+  // word wrapping between certain characters *only* if a new inline
+  // element is started between them. This makes it hard to reliably
+  // measure the position of things, since that requires inserting an
+  // extra span. This terribly fragile set of regexps matches the
+  // character combinations that suffer from this phenomenon on the
+  // various browsers.
+  var spanAffectsWrapping = /^$/; // Won't match any two-character string
+  if (gecko) spanAffectsWrapping = /$'/;
+  else if (safari && !/Version\/([6-9]|\d\d)\b/.test(navigator.userAgent)) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
+  else if (webkit) spanAffectsWrapping = /[~!#%&*)=+}\]|\"\.>,:;][({[<]|-[^\-?\.]|\?[\w~`@#$%\^&*(_=+{[|><]/;
+
+  var knownScrollbarWidth;
+  function scrollbarWidth(measure) {
+    if (knownScrollbarWidth != null) return knownScrollbarWidth;
+    var test = elt("div", null, null, "width: 50px; height: 50px; overflow-x: scroll");
+    removeChildrenAndAdd(measure, test);
+    if (test.offsetWidth)
+      knownScrollbarWidth = test.offsetHeight - test.clientHeight;
+    return knownScrollbarWidth || 0;
+  }
+
+  var zwspSupported;
+  function zeroWidthElement(measure) {
+    if (zwspSupported == null) {
+      var test = elt("span", "\u200b");
+      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
+      if (measure.firstChild.offsetHeight != 0)
+        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !ie_lt8;
+    }
+    if (zwspSupported) return elt("span", "\u200b");
+    else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
   }
 
   // See if "".split is the broken IE version, if so, provide an
@@ -3141,10 +5302,14 @@
     return range.compareEndPoints("StartToEnd", range) != 0;
   };
 
-  CodeMirror.defineMode("null", function() {
-    return {token: function(stream) {stream.skipToEnd();}};
-  });
-  CodeMirror.defineMIME("text/plain", "null");
+  var hasCopyEvent = (function() {
+    var e = elt("div");
+    if ("oncopy" in e) return true;
+    e.setAttribute("oncopy", "return;");
+    return typeof e.oncopy == 'function';
+  })();
+
+  // KEY NAMING
 
   var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                   19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
@@ -3163,7 +5328,256 @@
     for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
   })();
 
-  CodeMirror.version = "2.36";
+  // BIDI HELPERS
+
+  function iterateBidiSections(order, from, to, f) {
+    if (!order) return f(from, to, "ltr");
+    for (var i = 0; i < order.length; ++i) {
+      var part = order[i];
+      if (part.from < to && part.to > from || from == to && part.to == from)
+        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
+    }
+  }
+
+  function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
+  function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
+
+  function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
+  function lineRight(line) {
+    var order = getOrder(line);
+    if (!order) return line.text.length;
+    return bidiRight(lst(order));
+  }
+
+  function lineStart(cm, lineN) {
+    var line = getLine(cm.doc, lineN);
+    var visual = visualLine(cm.doc, line);
+    if (visual != line) lineN = lineNo(visual);
+    var order = getOrder(visual);
+    var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
+    return Pos(lineN, ch);
+  }
+  function lineEnd(cm, lineN) {
+    var merged, line;
+    while (merged = collapsedSpanAtEnd(line = getLine(cm.doc, lineN)))
+      lineN = merged.find().to.line;
+    var order = getOrder(line);
+    var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
+    return Pos(lineN, ch);
+  }
+
+  // This is somewhat involved. It is needed in order to move
+  // 'visually' through bi-directional text -- i.e., pressing left
+  // should make the cursor go left, even when in RTL text. The
+  // tricky part is the 'jumps', where RTL and LTR text touch each
+  // other. This often requires the cursor offset to move more than
+  // one unit, in order to visually move one unit.
+  function moveVisually(line, start, dir, byUnit) {
+    var bidi = getOrder(line);
+    if (!bidi) return moveLogically(line, start, dir, byUnit);
+    var moveOneUnit = byUnit ? function(pos, dir) {
+      do pos += dir;
+      while (pos > 0 && isExtendingChar.test(line.text.charAt(pos)));
+      return pos;
+    } : function(pos, dir) { return pos + dir; };
+    var linedir = bidi[0].level;
+    for (var i = 0; i < bidi.length; ++i) {
+      var part = bidi[i], sticky = part.level % 2 == linedir;
+      if ((part.from < start && part.to > start) ||
+          (sticky && (part.from == start || part.to == start))) break;
+    }
+    var target = moveOneUnit(start, part.level % 2 ? -dir : dir);
+
+    while (target != null) {
+      if (part.level % 2 == linedir) {
+        if (target < part.from || target > part.to) {
+          part = bidi[i += dir];
+          target = part && (dir > 0 == part.level % 2 ? moveOneUnit(part.to, -1) : moveOneUnit(part.from, 1));
+        } else break;
+      } else {
+        if (target == bidiLeft(part)) {
+          part = bidi[--i];
+          target = part && bidiRight(part);
+        } else if (target == bidiRight(part)) {
+          part = bidi[++i];
+          target = part && bidiLeft(part);
+        } else break;
+      }
+    }
+
+    return target < 0 || target > line.text.length ? null : target;
+  }
+
+  function moveLogically(line, start, dir, byUnit) {
+    var target = start + dir;
+    if (byUnit) while (target > 0 && isExtendingChar.test(line.text.charAt(target))) target += dir;
+    return target < 0 || target > line.text.length ? null : target;
+  }
+
+  // Bidirectional ordering algorithm
+  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
+  // that this (partially) implements.
+
+  // One-char codes used for character types:
+  // L (L):   Left-to-Right
+  // R (R):   Right-to-Left
+  // r (AL):  Right-to-Left Arabic
+  // 1 (EN):  European Number
+  // + (ES):  European Number Separator
+  // % (ET):  European Number Terminator
+  // n (AN):  Arabic Number
+  // , (CS):  Common Number Separator
+  // m (NSM): Non-Spacing Mark
+  // b (BN):  Boundary Neutral
+  // s (B):   Paragraph Separator
+  // t (S):   Segment Separator
+  // w (WS):  Whitespace
+  // N (ON):  Other Neutrals
+
+  // Returns null if characters are ordered as they appear
+  // (left-to-right), or an array of sections ({from, to, level}
+  // objects) in the order in which they occur visually.
+  var bidiOrdering = (function() {
+    // Character types for codepoints 0 to 0xff
+    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLL";
+    // Character types for codepoints 0x600 to 0x6ff
+    var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmmrrrrrrrrrrrrrrrrrr";
+    function charType(code) {
+      if (code <= 0xff) return lowTypes.charAt(code);
+      else if (0x590 <= code && code <= 0x5f4) return "R";
+      else if (0x600 <= code && code <= 0x6ff) return arabicTypes.charAt(code - 0x600);
+      else if (0x700 <= code && code <= 0x8ac) return "r";
+      else return "L";
+    }
+
+    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
+    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
+    // Browsers seem to always treat the boundaries of block elements as being L.
+    var outerType = "L";
+
+    return function(str) {
+      if (!bidiRE.test(str)) return false;
+      var len = str.length, types = [];
+      for (var i = 0, type; i < len; ++i)
+        types.push(type = charType(str.charCodeAt(i)));
+
+      // W1. Examine each non-spacing mark (NSM) in the level run, and
+      // change the type of the NSM to the type of the previous
+      // character. If the NSM is at the start of the level run, it will
+      // get the type of sor.
+      for (var i = 0, prev = outerType; i < len; ++i) {
+        var type = types[i];
+        if (type == "m") types[i] = prev;
+        else prev = type;
+      }
+
+      // W2. Search backwards from each instance of a European number
+      // until the first strong type (R, L, AL, or sor) is found. If an
+      // AL is found, change the type of the European number to Arabic
+      // number.
+      // W3. Change all ALs to R.
+      for (var i = 0, cur = outerType; i < len; ++i) {
+        var type = types[i];
+        if (type == "1" && cur == "r") types[i] = "n";
+        else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
+      }
+
+      // W4. A single European separator between two European numbers
+      // changes to a European number. A single common separator between
+      // two numbers of the same type changes to that type.
+      for (var i = 1, prev = types[0]; i < len - 1; ++i) {
+        var type = types[i];
+        if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
+        else if (type == "," && prev == types[i+1] &&
+                 (prev == "1" || prev == "n")) types[i] = prev;
+        prev = type;
+      }
+
+      // W5. A sequence of European terminators adjacent to European
+      // numbers changes to all European numbers.
+      // W6. Otherwise, separators and terminators change to Other
+      // Neutral.
+      for (var i = 0; i < len; ++i) {
+        var type = types[i];
+        if (type == ",") types[i] = "N";
+        else if (type == "%") {
+          for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
+          var replace = (i && types[i-1] == "!") || (end < len - 1 && types[end] == "1") ? "1" : "N";
+          for (var j = i; j < end; ++j) types[j] = replace;
+          i = end - 1;
+        }
+      }
+
+      // W7. Search backwards from each instance of a European number
+      // until the first strong type (R, L, or sor) is found. If an L is
+      // found, then change the type of the European number to L.
+      for (var i = 0, cur = outerType; i < len; ++i) {
+        var type = types[i];
+        if (cur == "L" && type == "1") types[i] = "L";
+        else if (isStrong.test(type)) cur = type;
+      }
+
+      // N1. A sequence of neutrals takes the direction of the
+      // surrounding strong text if the text on both sides has the same
+      // direction. European and Arabic numbers act as if they were R in
+      // terms of their influence on neutrals. Start-of-level-run (sor)
+      // and end-of-level-run (eor) are used at level run boundaries.
+      // N2. Any remaining neutrals take the embedding direction.
+      for (var i = 0; i < len; ++i) {
+        if (isNeutral.test(types[i])) {
+          for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
+          var before = (i ? types[i-1] : outerType) == "L";
+          var after = (end < len - 1 ? types[end] : outerType) == "L";
+          var replace = before || after ? "L" : "R";
+          for (var j = i; j < end; ++j) types[j] = replace;
+          i = end - 1;
+        }
+      }
+
+      // Here we depart from the documented algorithm, in order to avoid
+      // building up an actual levels array. Since there are only three
+      // levels (0, 1, 2) in an implementation that doesn't take
+      // explicit embedding into account, we can build up the order on
+      // the fly, without following the level-based algorithm.
+      var order = [], m;
+      for (var i = 0; i < len;) {
+        if (countsAsLeft.test(types[i])) {
+          var start = i;
+          for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
+          order.push({from: start, to: i, level: 0});
+        } else {
+          var pos = i, at = order.length;
+          for (++i; i < len && types[i] != "L"; ++i) {}
+          for (var j = pos; j < i;) {
+            if (countsAsNum.test(types[j])) {
+              if (pos < j) order.splice(at, 0, {from: pos, to: j, level: 1});
+              var nstart = j;
+              for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
+              order.splice(at, 0, {from: nstart, to: j, level: 2});
+              pos = j;
+            } else ++j;
+          }
+          if (pos < i) order.splice(at, 0, {from: pos, to: i, level: 1});
+        }
+      }
+      if (order[0].level == 1 && (m = str.match(/^\s+/))) {
+        order[0].from = m[0].length;
+        order.unshift({from: 0, to: m[0].length, level: 0});
+      }
+      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
+        lst(order).to -= m[0].length;
+        order.push({from: len - m[0].length, to: len, level: 0});
+      }
+      if (order[0].level != lst(order).level)
+        order.push({from: len, to: len, level: order[0].level});
+
+      return order;
+    };
+  })();
+
+  // THE END
+
+  CodeMirror.version = "3.12";
 
   return CodeMirror;
 })();