Mercurial > kallithea
view rhodecode/lib/diffs.py @ 1753:1d1ccb873d00 beta
moved soon-to-be-deleted code from vcs to rhodecode
- diff lib
- annotate highlighter
author | Marcin Kuzminski <marcin@python-works.com> |
---|---|
date | Sun, 04 Dec 2011 23:39:32 +0200 |
parents | |
children | 5610fd9b6803 |
line wrap: on
line source
# -*- coding: utf-8 -*- """ rhodecode.lib.diffs ~~~~~~~~~~~~~~~~~~~ Set of diffing helpers, previously part of vcs :created_on: Dec 4, 2011 :author: marcink :copyright: (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com> :original copyright: 2007-2008 by Armin Ronacher :license: GPLv3, see COPYING for more details. """ # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. import re import difflib from itertools import tee, imap from mercurial.match import match from vcs.exceptions import VCSError from vcs.nodes import FileNode def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True): """ Returns git style diff between given ``filenode_old`` and ``filenode_new``. :param ignore_whitespace: ignore whitespaces in diff """ for filenode in (filenode_old, filenode_new): if not isinstance(filenode, FileNode): raise VCSError("Given object should be FileNode object, not %s" % filenode.__class__) old_raw_id = getattr(filenode_old.changeset, 'raw_id', '0' * 40) new_raw_id = getattr(filenode_new.changeset, 'raw_id', '0' * 40) repo = filenode_new.changeset.repository vcs_gitdiff = repo._get_diff(old_raw_id, new_raw_id, filenode_new.path, ignore_whitespace) return vcs_gitdiff class DiffProcessor(object): """ Give it a unified diff and it returns a list of the files that were mentioned in the diff together with a dict of meta information that can be used to render it in a HTML template. """ _chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)') def __init__(self, diff, differ='diff', format='udiff'): """ :param diff: a text in diff format or generator :param format: format of diff passed, `udiff` or `gitdiff` """ if isinstance(diff, basestring): diff = [diff] self.__udiff = diff self.__format = format self.adds = 0 self.removes = 0 if isinstance(self.__udiff, basestring): self.lines = iter(self.__udiff.splitlines(1)) elif self.__format == 'gitdiff': udiff_copy = self.copy_iterator() self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy)) else: udiff_copy = self.copy_iterator() self.lines = imap(self.escaper, udiff_copy) # Select a differ. if differ == 'difflib': self.differ = self._highlight_line_difflib else: self.differ = self._highlight_line_udiff def escaper(self, string): return string.replace('<', '<').replace('>', '>') def copy_iterator(self): """ make a fresh copy of generator, we should not iterate thru an original as it's needed for repeating operations on this instance of DiffProcessor """ self.__udiff, iterator_copy = tee(self.__udiff) return iterator_copy def _extract_rev(self, line1, line2): """ Extract the filename and revision hint from a line. """ try: if line1.startswith('--- ') and line2.startswith('+++ '): l1 = line1[4:].split(None, 1) old_filename = l1[0].lstrip('a/') if len(l1) >= 1 else None old_rev = l1[1] if len(l1) == 2 else 'old' l2 = line2[4:].split(None, 1) new_filename = l2[0].lstrip('b/') if len(l1) >= 1 else None new_rev = l2[1] if len(l2) == 2 else 'new' filename = old_filename if (old_filename != 'dev/null') else new_filename return filename, new_rev, old_rev except (ValueError, IndexError): pass return None, None, None def _parse_gitdiff(self, diffiterator): def line_decoder(l): if l.startswith('+') and not l.startswith('+++'): self.adds += 1 elif l.startswith('-') and not l.startswith('---'): self.removes += 1 return l.decode('utf8', 'replace') output = list(diffiterator) size = len(output) if size == 2: l = [] l.extend([output[0]]) l.extend(output[1].splitlines(1)) return map(line_decoder, l) elif size == 1: return map(line_decoder, output[0].splitlines(1)) elif size == 0: return [] raise Exception('wrong size of diff %s' % size) def _highlight_line_difflib(self, line, next): """ Highlight inline changes in both lines. """ if line['action'] == 'del': old, new = line, next else: old, new = next, line oldwords = re.split(r'(\W)', old['line']) newwords = re.split(r'(\W)', new['line']) sequence = difflib.SequenceMatcher(None, oldwords, newwords) oldfragments, newfragments = [], [] for tag, i1, i2, j1, j2 in sequence.get_opcodes(): oldfrag = ''.join(oldwords[i1:i2]) newfrag = ''.join(newwords[j1:j2]) if tag != 'equal': if oldfrag: oldfrag = '<del>%s</del>' % oldfrag if newfrag: newfrag = '<ins>%s</ins>' % newfrag oldfragments.append(oldfrag) newfragments.append(newfrag) old['line'] = "".join(oldfragments) new['line'] = "".join(newfragments) def _highlight_line_udiff(self, line, next): """ Highlight inline changes in both lines. """ start = 0 limit = min(len(line['line']), len(next['line'])) while start < limit and line['line'][start] == next['line'][start]: start += 1 end = -1 limit -= start while -end <= limit and line['line'][end] == next['line'][end]: end -= 1 end += 1 if start or end: def do(l): last = end + len(l['line']) if l['action'] == 'add': tag = 'ins' else: tag = 'del' l['line'] = '%s<%s>%s</%s>%s' % ( l['line'][:start], tag, l['line'][start:last], tag, l['line'][last:] ) do(line) do(next) def _parse_udiff(self): """ Parse the diff an return data for the template. """ lineiter = self.lines files = [] try: line = lineiter.next() # skip first context skipfirst = True while 1: # continue until we found the old file if not line.startswith('--- '): line = lineiter.next() continue chunks = [] filename, old_rev, new_rev = \ self._extract_rev(line, lineiter.next()) files.append({ 'filename': filename, 'old_revision': old_rev, 'new_revision': new_rev, 'chunks': chunks }) line = lineiter.next() while line: match = self._chunk_re.match(line) if not match: break lines = [] chunks.append(lines) old_line, old_end, new_line, new_end = \ [int(x or 1) for x in match.groups()[:-1]] old_line -= 1 new_line -= 1 context = len(match.groups()) == 5 old_end += old_line new_end += new_line if context: if not skipfirst: lines.append({ 'old_lineno': '...', 'new_lineno': '...', 'action': 'context', 'line': line, }) else: skipfirst = False line = lineiter.next() while old_line < old_end or new_line < new_end: if line: command, line = line[0], line[1:] else: command = ' ' affects_old = affects_new = False # ignore those if we don't expect them if command in '#@': continue elif command == '+': affects_new = True action = 'add' elif command == '-': affects_old = True action = 'del' else: affects_old = affects_new = True action = 'unmod' old_line += affects_old new_line += affects_new lines.append({ 'old_lineno': affects_old and old_line or '', 'new_lineno': affects_new and new_line or '', 'action': action, 'line': line }) line = lineiter.next() except StopIteration: pass # highlight inline changes for file in files: for chunk in chunks: lineiter = iter(chunk) #first = True try: while 1: line = lineiter.next() if line['action'] != 'unmod': nextline = lineiter.next() if nextline['action'] == 'unmod' or \ nextline['action'] == line['action']: continue self.differ(line, nextline) except StopIteration: pass return files def prepare(self): """ Prepare the passed udiff for HTML rendering. It'l return a list of dicts """ return self._parse_udiff() def _safe_id(self, idstring): """Make a string safe for including in an id attribute. The HTML spec says that id attributes 'must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".")'. These regexps are slightly over-zealous, in that they remove colons and periods unnecessarily. Whitespace is transformed into underscores, and then anything which is not a hyphen or a character that matches \w (alphanumerics and underscore) is removed. """ # Transform all whitespace to underscore idstring = re.sub(r'\s', "_", '%s' % idstring) # Remove everything that is not a hyphen or a member of \w idstring = re.sub(r'(?!-)\W', "", idstring).lower() return idstring def raw_diff(self): """ Returns raw string as udiff """ udiff_copy = self.copy_iterator() if self.__format == 'gitdiff': udiff_copy = self._parse_gitdiff(udiff_copy) return u''.join(udiff_copy) def as_html(self, table_class='code-difftable', line_class='line', new_lineno_class='lineno old', old_lineno_class='lineno new', code_class='code'): """ Return udiff as html table with customized css classes """ def _link_to_if(condition, label, url): """ Generates a link if condition is meet or just the label if not. """ if condition: return '''<a href="%(url)s">%(label)s</a>''' % {'url': url, 'label': label} else: return label diff_lines = self.prepare() _html_empty = True _html = [] _html.append('''<table class="%(table_class)s">\n''' \ % {'table_class': table_class}) for diff in diff_lines: for line in diff['chunks']: _html_empty = False for change in line: _html.append('''<tr class="%(line_class)s %(action)s">\n''' \ % {'line_class': line_class, 'action': change['action']}) anchor_old_id = '' anchor_new_id = '' anchor_old = "%(filename)s_o%(oldline_no)s" % \ {'filename': self._safe_id(diff['filename']), 'oldline_no': change['old_lineno']} anchor_new = "%(filename)s_n%(oldline_no)s" % \ {'filename': self._safe_id(diff['filename']), 'oldline_no': change['new_lineno']} cond_old = change['old_lineno'] != '...' and \ change['old_lineno'] cond_new = change['new_lineno'] != '...' and \ change['new_lineno'] if cond_old: anchor_old_id = 'id="%s"' % anchor_old if cond_new: anchor_new_id = 'id="%s"' % anchor_new ########################################################### # OLD LINE NUMBER ########################################################### _html.append('''\t<td %(a_id)s class="%(old_lineno_cls)s">''' \ % {'a_id': anchor_old_id, 'old_lineno_cls': old_lineno_class}) _html.append('''<pre>%(link)s</pre>''' \ % {'link': _link_to_if(cond_old, change['old_lineno'], '#%s' \ % anchor_old)}) _html.append('''</td>\n''') ########################################################### # NEW LINE NUMBER ########################################################### _html.append('''\t<td %(a_id)s class="%(new_lineno_cls)s">''' \ % {'a_id': anchor_new_id, 'new_lineno_cls': new_lineno_class}) _html.append('''<pre>%(link)s</pre>''' \ % {'link': _link_to_if(cond_new, change['new_lineno'], '#%s' \ % anchor_new)}) _html.append('''</td>\n''') ########################################################### # CODE ########################################################### _html.append('''\t<td class="%(code_class)s">''' \ % {'code_class': code_class}) _html.append('''\n\t\t<pre>%(code)s</pre>\n''' \ % {'code': change['line']}) _html.append('''\t</td>''') _html.append('''\n</tr>\n''') _html.append('''</table>''') if _html_empty: return None return ''.join(_html) def stat(self): """ Returns tuple of added, and removed lines for this instance """ return self.adds, self.removes