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annotate roundup/i18n.py @ 4813:a072b35d0606

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i18n: Remove Python 2.3 compatibility
author anatoly techtonik <techtonik@gmail.com>
date Sun, 25 Aug 2013 08:07:59 +0300
parents 6e3e4f24c753
children 6102252d3a8a
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 """
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19 RoundUp Internationalization (I18N)
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20
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21 To use this module, the following code should be used::
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22
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23 from roundup.i18n import _
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24 ...
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25 print _("Some text that can be translated")
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26
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27 Note that to enable re-ordering of inserted texts in formatting strings
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28 (which can easily happen if a sentence has to be re-ordered due to
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29 grammatical changes), translatable formats should use named format specs::
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31 ... _('Index of %(classname)s') % {'classname': cn} ...
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32
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33 Also, this eases the job of translators since they have some context what
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34 the dynamic portion of a message really means.
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35 """
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36 __docformat__ = 'restructuredtext'
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37
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38 import errno
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39 import gettext as gettext_module
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40 import os
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41
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42 from roundup import msgfmt
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43
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44 # List of directories for mo file search (see SF bug 1219689)
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45 LOCALE_DIRS = [
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46 gettext_module._default_localedir,
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47 ]
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48 # compute mo location relative to roundup installation directory
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49 # (prefix/lib/python/site-packages/roundup/msgfmt.py on posix systems,
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50 # prefix/lib/site-packages/roundup/msgfmt.py on windows).
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51 # locale root is prefix/share/locale.
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52 if os.name == "nt":
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53 _mo_path = [".."] * 4 + ["share", "locale"]
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54 else:
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55 _mo_path = [".."] * 5 + ["share", "locale"]
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56 _mo_path = os.path.normpath(os.path.join(msgfmt.__file__, *_mo_path))
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57 if _mo_path not in LOCALE_DIRS:
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58 LOCALE_DIRS.append(_mo_path)
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59 del _mo_path
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60
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61 # Roundup text domain
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62 DOMAIN = "roundup"
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63
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64 RoundupNullTranslations = gettext_module.NullTranslations
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65 RoundupTranslations = gettext_module.GNUTranslations
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66
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67 def find_locales(language=None):
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68 """Return normalized list of locale names to try for given language
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69
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70 Argument 'language' may be a single language code or a list of codes.
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71 If 'language' is omitted or None, use locale settings in OS environment.
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72
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73 """
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74 # body of this function is borrowed from gettext_module.find()
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75 if language is None:
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76 languages = []
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77 for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
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78 val = os.environ.get(envar)
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79 if val:
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80 languages = val.split(':')
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81 break
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82 elif isinstance(language, str) or isinstance(language, unicode):
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83 languages = [language]
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84 else:
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85 # 'language' must be iterable
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86 languages = language
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87 # now normalize and expand the languages
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88 nelangs = []
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89 for lang in languages:
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90 for nelang in gettext_module._expand_lang(lang):
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91 if nelang not in nelangs:
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92 nelangs.append(nelang)
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93 return nelangs
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94
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95 def get_mofile(languages, localedir, domain=None):
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96 """Return the first of .mo files found in localedir for languages
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97
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98 Parameters:
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99 languages:
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100 list of locale names to try
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101 localedir:
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102 path to directory containing locale files.
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103 Usually this is either gettext_module._default_localedir
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104 or 'locale' subdirectory in the tracker home.
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105 domain:
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106 optional name of messages domain.
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107 If omitted or None, work with simplified
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108 locale directory, as used in tracker homes:
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109 message catalogs are kept in files locale.po
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110 instead of locale/LC_MESSAGES/domain.po
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111
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112 Return the path of the first .mo file found.
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113 If nothing found, return None.
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114
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115 Automatically compile .po files if necessary.
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116
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117 """
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118 for locale in languages:
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119 if locale == "C":
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120 break
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121 if domain:
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122 basename = os.path.join(localedir, locale, "LC_MESSAGES", domain)
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123 else:
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124 basename = os.path.join(localedir, locale)
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125 # look for message catalog files, check timestamps
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126 mofile = basename + ".mo"
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127 if os.path.isfile(mofile):
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128 motime = os.path.getmtime(mofile)
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129 else:
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130 motime = 0
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131 pofile = basename + ".po"
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132 if os.path.isfile(pofile):
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133 potime = os.path.getmtime(pofile)
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134 else:
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135 potime = 0
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136 # see what we've found
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137 if motime < potime:
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138 # compile
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139 msgfmt.make(pofile, mofile)
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140 elif motime == 0:
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141 # no files found - proceed to the next locale name
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142 continue
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143 # .mo file found or made
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144 return mofile
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145 return None
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146
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147 def get_translation(language=None, tracker_home=None,
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148 translation_class=RoundupTranslations,
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149 null_translation_class=RoundupNullTranslations
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150 ):
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151 """Return Translation object for given language and domain
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152
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153 Argument 'language' may be a single language code or a list of codes.
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154 If 'language' is omitted or None, use locale settings in OS environment.
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155
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156 Arguments 'translation_class' and 'null_translation_class'
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157 specify the classes that are instantiated for existing
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158 and non-existing translations, respectively.
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159
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160 """
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161 mofiles = []
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162 # locale directory paths
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163 if tracker_home is None:
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164 tracker_locale = None
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165 else:
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166 tracker_locale = os.path.join(tracker_home, "locale")
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167 # get the list of locales
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168 locales = find_locales(language)
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169 # add mofiles found in the tracker, then in the system locale directory
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170 if tracker_locale:
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171 mofiles.append(get_mofile(locales, tracker_locale))
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172 for system_locale in LOCALE_DIRS:
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173 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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174 # we want to fall back to english unless english is selected language
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175 if "en" not in locales:
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176 locales = find_locales("en")
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177 # add mofiles found in the tracker, then in the system locale directory
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178 if tracker_locale:
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179 mofiles.append(get_mofile(locales, tracker_locale))
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180 for system_locale in LOCALE_DIRS:
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181 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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182 # filter out elements that are not found
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183 mofiles = filter(None, mofiles)
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184 if mofiles:
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185 translator = translation_class(open(mofiles[0], "rb"))
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186 for mofile in mofiles[1:]:
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187 # note: current implementation of gettext_module
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188 # always adds fallback to the end of the fallback chain.
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189 translator.add_fallback(translation_class(open(mofile, "rb")))
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190 else:
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191 translator = null_translation_class()
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192 return translator
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193
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194 # static translations object
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195 translation = get_translation()
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196 # static translation functions
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197 _ = gettext = translation.gettext
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198 ugettext = translation.ugettext
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199 ngettext = translation.ngettext
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200 ungettext = translation.ungettext
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201
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202 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/