Mercurial > kallithea

annotate rhodecode/lib/compat.py @ 1547:fbc762ae3496 beta

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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>
date Tue, 11 Oct 2011 23:39:03 +0200
parents 87ec80c280bb
children d6cb805c92fd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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parents:
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155
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parents:
diff changeset
156 def __delitem__(self, key):
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diff changeset
157 dict_impl = self._dict_impl()
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parents:
diff changeset
158 pred, _ , succ = self._dict_impl().__getitem__(self, key)
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parents:
diff changeset
159 if pred == _nil:
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parents:
diff changeset
160 dict_impl.__setattr__(self, 'lh', succ)
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parents:
diff changeset
161 else:
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parents:
diff changeset
162 dict_impl.__getitem__(self, pred)[2] = succ
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parents:
diff changeset
163 if succ == _nil:
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parents:
diff changeset
164 dict_impl.__setattr__(self, 'lt', pred)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
165 else:
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parents:
diff changeset
166 dict_impl.__getitem__(self, succ)[0] = pred
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parents:
diff changeset
167 dict_impl.__delitem__(self, key)
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parents:
diff changeset
168
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parents:
diff changeset
169 def __contains__(self, key):
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parents:
diff changeset
170 return key in self.keys()
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parents:
diff changeset
171
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parents:
diff changeset
172 def __len__(self):
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parents:
diff changeset
173 return len(self.keys())
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parents:
diff changeset
174
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diff changeset
175 def __str__(self):
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parents:
diff changeset
176 pairs = ("%r: %r" % (k, v) for k, v in self.iteritems())
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parents:
diff changeset
177 return "{%s}" % ", ".join(pairs)
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parents:
diff changeset
178
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diff changeset
179 def __repr__(self):
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diff changeset
180 if self:
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parents:
diff changeset
181 pairs = ("(%r, %r)" % (k, v) for k, v in self.iteritems())
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parents:
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182 return "odict([%s])" % ", ".join(pairs)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
183 else:
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184 return "odict()"
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diff changeset
185
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diff changeset
186 def get(self, k, x=None):
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parents:
diff changeset
187 if k in self:
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parents:
diff changeset
188 return self._dict_impl().__getitem__(self, k)[1]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
189 else:
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parents:
diff changeset
190 return x
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diff changeset
191
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diff changeset
192 def __iter__(self):
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diff changeset
193 dict_impl = self._dict_impl()
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diff changeset
194 curr_key = dict_impl.__getattribute__(self, 'lh')
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parents:
diff changeset
195 while curr_key != _nil:
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parents:
diff changeset
196 yield curr_key
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diff changeset
197 curr_key = dict_impl.__getitem__(self, curr_key)[2]
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198
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diff changeset
199 iterkeys = __iter__
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diff changeset
200
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diff changeset
201 def keys(self):
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parents:
diff changeset
202 return list(self.iterkeys())
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parents:
diff changeset
203
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diff changeset
204 def itervalues(self):
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parents:
diff changeset
205 dict_impl = self._dict_impl()
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parents:
diff changeset
206 curr_key = dict_impl.__getattribute__(self, 'lh')
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parents:
diff changeset
207 while curr_key != _nil:
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parents:
diff changeset
208 _, val, curr_key = dict_impl.__getitem__(self, curr_key)
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parents:
diff changeset
209 yield val
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parents:
diff changeset
210
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parents:
diff changeset
211 def values(self):
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parents:
diff changeset
212 return list(self.itervalues())
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parents:
diff changeset
213
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parents:
diff changeset
214 def iteritems(self):
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parents:
diff changeset
215 dict_impl = self._dict_impl()
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parents:
diff changeset
216 curr_key = dict_impl.__getattribute__(self, 'lh')
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
217 while curr_key != _nil:
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parents:
diff changeset
218 _, val, next_key = dict_impl.__getitem__(self, curr_key)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
219 yield curr_key, val
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
220 curr_key = next_key
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
221
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
222 def items(self):
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parents:
diff changeset
223 return list(self.iteritems())
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parents:
diff changeset
224
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
225 def sort(self, cmp=None, key=None, reverse=False):
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parents:
diff changeset
226 items = [(k, v) for k, v in self.items()]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
227 if cmp is not None:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
228 items = sorted(items, cmp=cmp)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
229 elif key is not None:
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parents:
diff changeset
230 items = sorted(items, key=key)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
231 else:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
232 items = sorted(items, key=lambda x: x[1])
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
233 if reverse:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
234 items.reverse()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
235 self.clear()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
236 self.__init__(items)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
237
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
238 def clear(self):
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parents:
diff changeset
239 dict_impl = self._dict_impl()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
240 dict_impl.clear(self)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
241 dict_impl.__setattr__(self, 'lh', _nil)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
242 dict_impl.__setattr__(self, 'lt', _nil)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
243
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
244 def copy(self):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
245 return self.__class__(self)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
246
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
247 def update(self, data=(), **kwds):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
248 if kwds:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
249 raise TypeError("update() of ordered dict takes no keyword "
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
250 "arguments to avoid an ordering trap.")
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
251 if hasattr(data, "iteritems"):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
252 data = data.iteritems()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
253 for key, val in data:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
254 self[key] = val
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
255
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
256 def setdefault(self, k, x=None):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
257 try:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
258 return self[k]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
259 except KeyError:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
260 self[k] = x
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
261 return x
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
262
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
263 def pop(self, k, x=_nil):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
264 try:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
265 val = self[k]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
266 del self[k]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
267 return val
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
268 except KeyError:
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
269 if x == _nil:
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
270 raise
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
271 return x
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
272
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
273 def popitem(self):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
274 try:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
275 dict_impl = self._dict_impl()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
276 key = dict_impl.__getattribute__(self, 'lt')
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
277 return key, self.pop(key)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
278 except KeyError:
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
279 raise KeyError("'popitem(): ordered dictionary is empty'")
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
280
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
281 def riterkeys(self):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
282 """To iterate on keys in reversed order.
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
283 """
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
284 dict_impl = self._dict_impl()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
285 curr_key = dict_impl.__getattribute__(self, 'lt')
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
286 while curr_key != _nil:
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
287 yield curr_key
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
288 curr_key = dict_impl.__getitem__(self, curr_key)[0]
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
289
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
290 __reversed__ = riterkeys
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
291
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
292 def rkeys(self):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
293 """List of the keys in reversed order.
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
294 """
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
295 return list(self.riterkeys())
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
296
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
297 def ritervalues(self):
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
298 """To iterate on values in reversed order.
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
299 """
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
300 dict_impl = self._dict_impl()
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
301 curr_key = dict_impl.__getattribute__(self, 'lt')
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
302 while curr_key != _nil:
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
303 curr_key, val, _ = dict_impl.__getitem__(self, curr_key)
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
304 yield val
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
305
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
306 def rvalues(self):
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
307 """List of the values in reversed order.
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
308 """
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
309 return list(self.ritervalues())
87ec80c280bb fixed issues with python2.5
Marcin Kuzminski <marcin@python-works.com>
parents:
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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