Mercurial > kallithea
annotate rhodecode/lib/compat.py @ 1547:fbc762ae3496 beta
unified generation of repo groups choices
added on-the-fly conversion to new repository groups format (supporting path as a link)
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Tue, 11 Oct 2011 23:39:03 +0200 |
parents | 87ec80c280bb |
children | d6cb805c92fd |
rev | line source |
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1514
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1 # -*- coding: utf-8 -*- |
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2 """ |
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3 rhodecode.lib.compat |
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4 ~~~~~~~~~~~~~~~~~~~~ |
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5 |
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6 Python backward compatibility functions and common libs |
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7 |
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8 |
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9 :created_on: Oct 7, 2011 |
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10 :author: marcink |
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11 :copyright: (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com> |
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12 :license: GPLv3, see COPYING for more details. |
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13 """ |
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14 # This program is free software: you can redistribute it and/or modify |
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15 # it under the terms of the GNU General Public License as published by |
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16 # the Free Software Foundation, either version 3 of the License, or |
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17 # (at your option) any later version. |
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18 # |
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19 # This program is distributed in the hope that it will be useful, |
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20 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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22 # GNU General Public License for more details. |
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23 # |
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24 # You should have received a copy of the GNU General Public License |
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25 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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26 |
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27 #============================================================================== |
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28 # json |
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29 #============================================================================== |
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30 try: |
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31 import json |
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32 except ImportError: |
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33 import simplejson as json |
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34 |
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35 |
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36 #============================================================================== |
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37 # izip_longest |
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38 #============================================================================== |
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39 try: |
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40 from itertools import izip_longest |
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41 except ImportError: |
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42 import itertools |
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43 |
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44 def izip_longest(*args, **kwds): # noqa |
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45 fillvalue = kwds.get("fillvalue") |
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46 |
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47 def sentinel(counter=([fillvalue] * (len(args) - 1)).pop): |
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48 yield counter() # yields the fillvalue, or raises IndexError |
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49 |
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50 fillers = itertools.repeat(fillvalue) |
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51 iters = [itertools.chain(it, sentinel(), fillers) |
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52 for it in args] |
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53 try: |
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54 for tup in itertools.izip(*iters): |
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55 yield tup |
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56 except IndexError: |
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57 pass |
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58 |
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59 |
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60 #============================================================================== |
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61 # OrderedDict |
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62 #============================================================================== |
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63 |
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64 # Python Software Foundation License |
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65 |
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66 # XXX: it feels like using the class with "is" and "is not" instead of "==" and |
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67 # "!=" should be faster. |
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68 class _Nil(object): |
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69 |
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70 def __repr__(self): |
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71 return "nil" |
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72 |
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73 def __eq__(self, other): |
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74 if (isinstance(other, _Nil)): |
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75 return True |
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76 else: |
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77 return NotImplemented |
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78 |
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79 def __ne__(self, other): |
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80 if (isinstance(other, _Nil)): |
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81 return False |
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82 else: |
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83 return NotImplemented |
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84 |
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85 _nil = _Nil() |
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86 |
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87 class _odict(object): |
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88 """Ordered dict data structure, with O(1) complexity for dict operations |
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89 that modify one element. |
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90 |
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91 Overwriting values doesn't change their original sequential order. |
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92 """ |
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93 |
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94 def _dict_impl(self): |
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95 return None |
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96 |
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97 def __init__(self, data=(), **kwds): |
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98 """This doesn't accept keyword initialization as normal dicts to avoid |
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99 a trap - inside a function or method the keyword args are accessible |
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100 only as a dict, without a defined order, so their original order is |
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101 lost. |
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102 """ |
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103 if kwds: |
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104 raise TypeError("__init__() of ordered dict takes no keyword " |
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105 "arguments to avoid an ordering trap.") |
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106 self._dict_impl().__init__(self) |
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107 # If you give a normal dict, then the order of elements is undefined |
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108 if hasattr(data, "iteritems"): |
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109 for key, val in data.iteritems(): |
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110 self[key] = val |
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111 else: |
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112 for key, val in data: |
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113 self[key] = val |
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114 |
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115 # Double-linked list header |
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116 def _get_lh(self): |
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117 dict_impl = self._dict_impl() |
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118 if not hasattr(self, '_lh'): |
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119 dict_impl.__setattr__(self, '_lh', _nil) |
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120 return dict_impl.__getattribute__(self, '_lh') |
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121 |
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122 def _set_lh(self, val): |
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123 self._dict_impl().__setattr__(self, '_lh', val) |
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124 |
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125 lh = property(_get_lh, _set_lh) |
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126 |
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127 # Double-linked list tail |
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128 def _get_lt(self): |
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129 dict_impl = self._dict_impl() |
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130 if not hasattr(self, '_lt'): |
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131 dict_impl.__setattr__(self, '_lt', _nil) |
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132 return dict_impl.__getattribute__(self, '_lt') |
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133 |
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134 def _set_lt(self, val): |
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135 self._dict_impl().__setattr__(self, '_lt', val) |
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136 |
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137 lt = property(_get_lt, _set_lt) |
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138 |
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139 def __getitem__(self, key): |
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140 return self._dict_impl().__getitem__(self, key)[1] |
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141 |
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142 def __setitem__(self, key, val): |
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143 dict_impl = self._dict_impl() |
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144 try: |
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145 dict_impl.__getitem__(self, key)[1] = val |
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146 except KeyError, e: |
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147 new = [dict_impl.__getattribute__(self, 'lt'), val, _nil] |
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148 dict_impl.__setitem__(self, key, new) |
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149 if dict_impl.__getattribute__(self, 'lt') == _nil: |
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150 dict_impl.__setattr__(self, 'lh', key) |
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151 else: |
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152 dict_impl.__getitem__( |
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153 self, dict_impl.__getattribute__(self, 'lt'))[2] = key |
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154 dict_impl.__setattr__(self, 'lt', key) |
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155 |
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156 def __delitem__(self, key): |
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157 dict_impl = self._dict_impl() |
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158 pred, _ , succ = self._dict_impl().__getitem__(self, key) |
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159 if pred == _nil: |
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160 dict_impl.__setattr__(self, 'lh', succ) |
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161 else: |
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162 dict_impl.__getitem__(self, pred)[2] = succ |
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163 if succ == _nil: |
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164 dict_impl.__setattr__(self, 'lt', pred) |
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165 else: |
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166 dict_impl.__getitem__(self, succ)[0] = pred |
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167 dict_impl.__delitem__(self, key) |
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168 |
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169 def __contains__(self, key): |
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170 return key in self.keys() |
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171 |
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172 def __len__(self): |
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173 return len(self.keys()) |
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174 |
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175 def __str__(self): |
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176 pairs = ("%r: %r" % (k, v) for k, v in self.iteritems()) |
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177 return "{%s}" % ", ".join(pairs) |
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178 |
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179 def __repr__(self): |
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180 if self: |
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181 pairs = ("(%r, %r)" % (k, v) for k, v in self.iteritems()) |
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182 return "odict([%s])" % ", ".join(pairs) |
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183 else: |
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184 return "odict()" |
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185 |
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186 def get(self, k, x=None): |
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187 if k in self: |
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188 return self._dict_impl().__getitem__(self, k)[1] |
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189 else: |
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190 return x |
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191 |
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192 def __iter__(self): |
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193 dict_impl = self._dict_impl() |
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194 curr_key = dict_impl.__getattribute__(self, 'lh') |
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195 while curr_key != _nil: |
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196 yield curr_key |
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197 curr_key = dict_impl.__getitem__(self, curr_key)[2] |
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198 |
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199 iterkeys = __iter__ |
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200 |
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201 def keys(self): |
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202 return list(self.iterkeys()) |
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203 |
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204 def itervalues(self): |
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205 dict_impl = self._dict_impl() |
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206 curr_key = dict_impl.__getattribute__(self, 'lh') |
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207 while curr_key != _nil: |
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208 _, val, curr_key = dict_impl.__getitem__(self, curr_key) |
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209 yield val |
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210 |
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211 def values(self): |
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212 return list(self.itervalues()) |
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213 |
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214 def iteritems(self): |
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215 dict_impl = self._dict_impl() |
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216 curr_key = dict_impl.__getattribute__(self, 'lh') |
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217 while curr_key != _nil: |
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218 _, val, next_key = dict_impl.__getitem__(self, curr_key) |
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219 yield curr_key, val |
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220 curr_key = next_key |
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221 |
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222 def items(self): |
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223 return list(self.iteritems()) |
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224 |
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225 def sort(self, cmp=None, key=None, reverse=False): |
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226 items = [(k, v) for k, v in self.items()] |
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227 if cmp is not None: |
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228 items = sorted(items, cmp=cmp) |
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229 elif key is not None: |
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230 items = sorted(items, key=key) |
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231 else: |
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232 items = sorted(items, key=lambda x: x[1]) |
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233 if reverse: |
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234 items.reverse() |
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235 self.clear() |
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236 self.__init__(items) |
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237 |
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238 def clear(self): |
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239 dict_impl = self._dict_impl() |
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240 dict_impl.clear(self) |
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241 dict_impl.__setattr__(self, 'lh', _nil) |
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242 dict_impl.__setattr__(self, 'lt', _nil) |
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243 |
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244 def copy(self): |
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245 return self.__class__(self) |
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246 |
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247 def update(self, data=(), **kwds): |
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248 if kwds: |
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249 raise TypeError("update() of ordered dict takes no keyword " |
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250 "arguments to avoid an ordering trap.") |
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251 if hasattr(data, "iteritems"): |
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252 data = data.iteritems() |
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253 for key, val in data: |
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254 self[key] = val |
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255 |
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256 def setdefault(self, k, x=None): |
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257 try: |
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258 return self[k] |
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259 except KeyError: |
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260 self[k] = x |
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|
261 return x |
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|
262 |
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|
263 def pop(self, k, x=_nil): |
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|
264 try: |
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265 val = self[k] |
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266 del self[k] |
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|
267 return val |
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|
268 except KeyError: |
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269 if x == _nil: |
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270 raise |
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271 return x |
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272 |
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273 def popitem(self): |
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274 try: |
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275 dict_impl = self._dict_impl() |
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276 key = dict_impl.__getattribute__(self, 'lt') |
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277 return key, self.pop(key) |
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278 except KeyError: |
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279 raise KeyError("'popitem(): ordered dictionary is empty'") |
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280 |
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281 def riterkeys(self): |
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282 """To iterate on keys in reversed order. |
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283 """ |
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284 dict_impl = self._dict_impl() |
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285 curr_key = dict_impl.__getattribute__(self, 'lt') |
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286 while curr_key != _nil: |
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287 yield curr_key |
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288 curr_key = dict_impl.__getitem__(self, curr_key)[0] |
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289 |
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290 __reversed__ = riterkeys |
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291 |
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292 def rkeys(self): |
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293 """List of the keys in reversed order. |
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294 """ |
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295 return list(self.riterkeys()) |
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296 |
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297 def ritervalues(self): |
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298 """To iterate on values in reversed order. |
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299 """ |
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300 dict_impl = self._dict_impl() |
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301 curr_key = dict_impl.__getattribute__(self, 'lt') |
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302 while curr_key != _nil: |
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303 curr_key, val, _ = dict_impl.__getitem__(self, curr_key) |
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304 yield val |
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305 |
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306 def rvalues(self): |
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307 """List of the values in reversed order. |
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308 """ |
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309 return list(self.ritervalues()) |
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310 |
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311 def riteritems(self): |
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312 """To iterate on (key, value) in reversed order. |
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313 """ |
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314 dict_impl = self._dict_impl() |
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315 curr_key = dict_impl.__getattribute__(self, 'lt') |
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316 while curr_key != _nil: |
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317 pred_key, val, _ = dict_impl.__getitem__(self, curr_key) |
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318 yield curr_key, val |
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319 curr_key = pred_key |
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320 |
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321 def ritems(self): |
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322 """List of the (key, value) in reversed order. |
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323 """ |
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324 return list(self.riteritems()) |
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325 |
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326 def firstkey(self): |
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327 if self: |
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328 return self._dict_impl().__getattribute__(self, 'lh') |
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329 else: |
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330 raise KeyError("'firstkey(): ordered dictionary is empty'") |
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331 |
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332 def lastkey(self): |
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333 if self: |
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334 return self._dict_impl().__getattribute__(self, 'lt') |
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335 else: |
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336 raise KeyError("'lastkey(): ordered dictionary is empty'") |
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337 |
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338 def as_dict(self): |
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339 return self._dict_impl()(self.items()) |
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340 |
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341 def _repr(self): |
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342 """_repr(): low level repr of the whole data contained in the odict. |
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343 Useful for debugging. |
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344 """ |
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345 dict_impl = self._dict_impl() |
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346 form = "odict low level repr lh,lt,data: %r, %r, %s" |
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347 return form % (dict_impl.__getattribute__(self, 'lh'), |
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348 dict_impl.__getattribute__(self, 'lt'), |
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349 dict_impl.__repr__(self)) |
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350 |
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351 class OrderedDict(_odict, dict): |
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352 |
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353 def _dict_impl(self): |
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354 return dict |
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355 |
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356 |
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357 #============================================================================== |
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358 # OrderedSet |
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359 #============================================================================== |
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360 from sqlalchemy.util import OrderedSet |