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annotate babel/util.py @ 529:5b62a9699780

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Get rid of the utility code for itemgetter(), we now simply import this from operator.
author jruigrok
date Sat, 05 Mar 2011 15:06:28 +0000
parents 5e1804d27d65
children e93f68837913
rev   line source
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2007 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://babel.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://babel.edgewall.org/log/.
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13
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14 """Various utility classes and functions."""
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15
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16 import codecs
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17 from datetime import timedelta, tzinfo
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18 import os
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19 import re
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20 import textwrap
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21 import time
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22 from itertools import izip, imap
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23
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24 missing = object()
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25
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26 __all__ = ['distinct', 'pathmatch', 'relpath', 'wraptext', 'odict', 'UTC',
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27 'LOCALTZ']
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28 __docformat__ = 'restructuredtext en'
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29
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30
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31 def distinct(iterable):
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32 """Yield all items in an iterable collection that are distinct.
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33
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34 Unlike when using sets for a similar effect, the original ordering of the
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35 items in the collection is preserved by this function.
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36
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37 >>> print list(distinct([1, 2, 1, 3, 4, 4]))
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38 [1, 2, 3, 4]
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39 >>> print list(distinct('foobar'))
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40 ['f', 'o', 'b', 'a', 'r']
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41
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42 :param iterable: the iterable collection providing the data
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43 :return: the distinct items in the collection
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44 :rtype: ``iterator``
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45 """
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46 seen = set()
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47 for item in iter(iterable):
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48 if item not in seen:
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49 yield item
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50 seen.add(item)
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51
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52 # Regexp to match python magic encoding line
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53 PYTHON_MAGIC_COMMENT_re = re.compile(
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54 r'[ \t\f]* \# .* coding[=:][ \t]*([-\w.]+)', re.VERBOSE)
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55 def parse_encoding(fp):
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56 """Deduce the encoding of a source file from magic comment.
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57
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58 It does this in the same way as the `Python interpreter`__
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59
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60 .. __: http://docs.python.org/ref/encodings.html
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61
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62 The ``fp`` argument should be a seekable file object.
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63
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64 (From Jeff Dairiki)
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65 """
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66 pos = fp.tell()
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67 fp.seek(0)
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68 try:
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69 line1 = fp.readline()
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70 has_bom = line1.startswith(codecs.BOM_UTF8)
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71 if has_bom:
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72 line1 = line1[len(codecs.BOM_UTF8):]
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73
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74 m = PYTHON_MAGIC_COMMENT_re.match(line1)
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75 if not m:
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76 try:
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77 import parser
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78 parser.suite(line1)
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79 except (ImportError, SyntaxError):
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80 # Either it's a real syntax error, in which case the source is
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81 # not valid python source, or line2 is a continuation of line1,
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82 # in which case we don't want to scan line2 for a magic
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83 # comment.
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84 pass
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85 else:
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86 line2 = fp.readline()
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87 m = PYTHON_MAGIC_COMMENT_re.match(line2)
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88
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89 if has_bom:
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90 if m:
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91 raise SyntaxError(
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92 "python refuses to compile code with both a UTF8 "
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93 "byte-order-mark and a magic encoding comment")
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94 return 'utf_8'
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95 elif m:
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96 return m.group(1)
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97 else:
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98 return None
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99 finally:
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100 fp.seek(pos)
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101
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102 def pathmatch(pattern, filename):
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103 """Extended pathname pattern matching.
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104
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105 This function is similar to what is provided by the ``fnmatch`` module in
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106 the Python standard library, but:
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107
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108 * can match complete (relative or absolute) path names, and not just file
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109 names, and
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110 * also supports a convenience pattern ("**") to match files at any
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111 directory level.
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112
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113 Examples:
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114
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115 >>> pathmatch('**.py', 'bar.py')
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116 True
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117 >>> pathmatch('**.py', 'foo/bar/baz.py')
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118 True
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119 >>> pathmatch('**.py', 'templates/index.html')
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120 False
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121
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122 >>> pathmatch('**/templates/*.html', 'templates/index.html')
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123 True
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124 >>> pathmatch('**/templates/*.html', 'templates/foo/bar.html')
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125 False
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126
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127 :param pattern: the glob pattern
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128 :param filename: the path name of the file to match against
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129 :return: `True` if the path name matches the pattern, `False` otherwise
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130 :rtype: `bool`
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131 """
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132 symbols = {
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133 '?': '[^/]',
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134 '?/': '[^/]/',
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135 '*': '[^/]+',
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136 '*/': '[^/]+/',
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137 '**/': '(?:.+/)*?',
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138 '**': '(?:.+/)*?[^/]+',
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139 }
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140 buf = []
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141 for idx, part in enumerate(re.split('([?*]+/?)', pattern)):
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142 if idx % 2:
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143 buf.append(symbols[part])
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144 elif part:
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145 buf.append(re.escape(part))
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146 match = re.match(''.join(buf) + '$', filename.replace(os.sep, '/'))
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147 return match is not None
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148
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149
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150 class TextWrapper(textwrap.TextWrapper):
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151 wordsep_re = re.compile(
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152 r'(\s+|' # any whitespace
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153 r'(?<=[\w\!\"\'\&\.\,\?])-{2,}(?=\w))' # em-dash
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154 )
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155
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156
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157 def wraptext(text, width=70, initial_indent='', subsequent_indent=''):
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158 """Simple wrapper around the ``textwrap.wrap`` function in the standard
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159 library. This version does not wrap lines on hyphens in words.
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160
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161 :param text: the text to wrap
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162 :param width: the maximum line width
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163 :param initial_indent: string that will be prepended to the first line of
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164 wrapped output
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165 :param subsequent_indent: string that will be prepended to all lines save
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166 the first of wrapped output
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167 :return: a list of lines
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168 :rtype: `list`
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169 """
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170 wrapper = TextWrapper(width=width, initial_indent=initial_indent,
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171 subsequent_indent=subsequent_indent,
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172 break_long_words=False)
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173 return wrapper.wrap(text)
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174
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175
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176 class odict(dict):
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177 """Ordered dict implementation.
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178
229
85340bec3a97 Fix tests broken by [233], and add new tests.
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179 :see: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
58
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180 """
64
7eb6fea17864 The order of extraction methods is now preserved (see #10).
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181 def __init__(self, data=None):
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182 dict.__init__(self, data or {})
165
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183 self._keys = dict.keys(self)
58
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184
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185 def __delitem__(self, key):
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186 dict.__delitem__(self, key)
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187 self._keys.remove(key)
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188
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189 def __setitem__(self, key, item):
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190 dict.__setitem__(self, key, item)
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191 if key not in self._keys:
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192 self._keys.append(key)
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193
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194 def __iter__(self):
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195 return iter(self._keys)
339
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196 iterkeys = __iter__
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197
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198 def clear(self):
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199 dict.clear(self)
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200 self._keys = []
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201
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202 def copy(self):
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203 d = odict()
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204 d.update(self)
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205 return d
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206
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207 def items(self):
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208 return zip(self._keys, self.values())
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209
339
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210 def iteritems(self):
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211 return izip(self._keys, self.itervalues())
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212
58
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213 def keys(self):
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214 return self._keys[:]
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215
339
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216 def pop(self, key, default=missing):
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217 if default is missing:
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218 return dict.pop(self, key)
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219 elif key not in self:
167
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220 return default
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221 self._keys.remove(key)
339
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222 return dict.pop(self, key, default)
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223
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224 def popitem(self, key):
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225 self._keys.remove(key)
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226 return dict.popitem(key)
167
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227
58
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228 def setdefault(self, key, failobj = None):
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229 dict.setdefault(self, key, failobj)
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230 if key not in self._keys:
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231 self._keys.append(key)
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232
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233 def update(self, dict):
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234 for (key, val) in dict.items():
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235 self[key] = val
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236
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237 def values(self):
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238 return map(self.get, self._keys)
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239
339
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240 def itervalues(self):
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241 return imap(self.get, self._keys)
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242
58
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243
3
e9eaddab598e Import of initial code base.
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244 try:
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245 relpath = os.path.relpath
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246 except AttributeError:
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247 def relpath(path, start='.'):
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248 """Compute the relative path to one path from another.
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249
132
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250 >>> relpath('foo/bar.txt', '').replace(os.sep, '/')
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251 'foo/bar.txt'
132
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252 >>> relpath('foo/bar.txt', 'foo').replace(os.sep, '/')
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253 'bar.txt'
132
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254 >>> relpath('foo/bar.txt', 'baz').replace(os.sep, '/')
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255 '../foo/bar.txt'
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256
31
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257 :return: the relative path
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258 :rtype: `basestring`
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259 """
3
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260 start_list = os.path.abspath(start).split(os.sep)
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261 path_list = os.path.abspath(path).split(os.sep)
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262
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263 # Work out how much of the filepath is shared by start and path.
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264 i = len(os.path.commonprefix([start_list, path_list]))
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265
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266 rel_list = [os.path.pardir] * (len(start_list) - i) + path_list[i:]
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267 return os.path.join(*rel_list)
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268
108
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269 ZERO = timedelta(0)
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270
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271
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272 class FixedOffsetTimezone(tzinfo):
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273 """Fixed offset in minutes east from UTC."""
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274
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275 def __init__(self, offset, name=None):
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276 self._offset = timedelta(minutes=offset)
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277 if name is None:
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278 name = 'Etc/GMT+%d' % offset
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279 self.zone = name
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280
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281 def __str__(self):
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282 return self.zone
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283
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284 def __repr__(self):
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285 return '<FixedOffset "%s" %s>' % (self.zone, self._offset)
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286
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287 def utcoffset(self, dt):
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288 return self._offset
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289
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290 def tzname(self, dt):
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291 return self.zone
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292
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293 def dst(self, dt):
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294 return ZERO
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295
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296
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297 try:
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298 from pytz import UTC
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299 except ImportError:
108
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300 UTC = FixedOffsetTimezone(0, 'UTC')
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301 """`tzinfo` object for UTC (Universal Time).
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302
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303 :type: `tzinfo`
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304 """
97
debd9ac3bb4d Fix for #11 (use local timezone in timestamps of generated POT).
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305
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306 STDOFFSET = timedelta(seconds = -time.timezone)
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307 if time.daylight:
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308 DSTOFFSET = timedelta(seconds = -time.altzone)
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309 else:
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310 DSTOFFSET = STDOFFSET
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311
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312 DSTDIFF = DSTOFFSET - STDOFFSET
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313
108
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314
97
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315 class LocalTimezone(tzinfo):
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316
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317 def utcoffset(self, dt):
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318 if self._isdst(dt):
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319 return DSTOFFSET
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320 else:
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321 return STDOFFSET
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diff changeset
322
debd9ac3bb4d Fix for #11 (use local timezone in timestamps of generated POT).
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323 def dst(self, dt):
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324 if self._isdst(dt):
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325 return DSTDIFF
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326 else:
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327 return ZERO
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328
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329 def tzname(self, dt):
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330 return time.tzname[self._isdst(dt)]
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331
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332 def _isdst(self, dt):
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333 tt = (dt.year, dt.month, dt.day,
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334 dt.hour, dt.minute, dt.second,
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335 dt.weekday(), 0, -1)
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336 stamp = time.mktime(tt)
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337 tt = time.localtime(stamp)
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338 return tt.tm_isdst > 0
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339
108
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340
99
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341 LOCALTZ = LocalTimezone()
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342 """`tzinfo` object for local time-zone.
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343
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344 :type: `tzinfo`
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345 """
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