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annotate roundup/i18n.py @ 2806:845e87d5e3ba

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translator objects now have the following search path: - selected locale messages in the tracker locale dir - selected locale messages in the system locale dir - english messages in the tracker locale dir - english messages in the system locale dir automatically compile .mo files if needed (found .po file and .mo is missing or .po mtime is greater that .mo mtime) removed support for python < 2.0. gettext module is now required. get_translation: removed 'domain' argument, added 'tracker_home' argument
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Sat, 23 Oct 2004 14:03:34 +0000
parents 7c1fbb2b2fc8
children ca541343c3ae
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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 # $Id: i18n.py,v 1.11 2004-10-23 14:03:34 a1s Exp $
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19
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20 """
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21 RoundUp Internationalization (I18N)
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22
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23 To use this module, the following code should be used::
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25 from roundup.i18n import _
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26 ...
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27 print _("Some text that can be translated")
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28
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29 Note that to enable re-ordering of inserted texts in formatting strings
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30 (which can easily happen if a sentence has to be re-ordered due to
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31 grammatical changes), translatable formats should use named format specs::
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32
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33 ... _('Index of %(classname)s') % {'classname': cn} ...
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34
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35 Also, this eases the job of translators since they have some context what
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36 the dynamic portion of a message really means.
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37 """
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38 __docformat__ = 'restructuredtext'
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39
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40 import errno
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41 import gettext as gettext_module
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42 import os
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43
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44 from roundup import msgfmt
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45
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46 # Roundup text domain
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47 DOMAIN = "roundup"
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48
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49 if hasattr(gettext_module.GNUTranslations, "ngettext"):
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50 # gettext_module has everything needed
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51 RoundupNullTranslations = gettext_module.NullTranslations
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52 RoundupTranslations = gettext_module.GNUTranslations
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53 else:
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54 # prior to 2.3, there was no plural forms. mix simple emulation in
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55 class PluralFormsMixIn:
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56 def ngettext(self, singular, plural, count):
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57 if count == 1:
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58 _msg = singular
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59 else:
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60 _msg = plural
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61 return self.gettext(_msg)
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62 def ungettext(self, singular, plural, count):
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63 if count == 1:
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64 _msg = singular
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65 else:
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66 _msg = plural
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67 return self.ugettext(_msg)
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68 class RoundupNullTranslations(
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69 gettext_module.NullTranslations, PluralFormsMixIn
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70 ):
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71 pass
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72 class RoundupTranslations(
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73 gettext_module.GNUTranslations, PluralFormsMixIn
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74 ):
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75 pass
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76
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77 def find_locales(language=None):
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78 """Return normalized list of locale names to try for given language
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79
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80 If language is None, use OS environment variables as a starting point
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81
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82 """
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83 # body of this function is borrowed from gettext_module.find()
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84 if language is None:
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85 languages = []
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86 for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
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87 val = os.environ.get(envar)
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88 if val:
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89 languages = val.split(':')
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90 break
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91 else:
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92 languages = [language]
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93 # now normalize and expand the languages
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94 nelangs = []
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95 for lang in languages:
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96 for nelang in gettext_module._expand_lang(lang):
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97 if nelang not in nelangs:
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98 nelangs.append(nelang)
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99 return nelangs
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100
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101 def get_mofile(languages, localedir, domain=None):
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102 """Return the first of .mo files found in localedir for languages
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103
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104 Parameters:
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105 languages:
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106 list of locale names to try
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107 localedir:
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108 path to directory containing locale files.
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109 Usually this is either gettext_module._default_localedir
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110 or 'locale' subdirectory in the tracker home.
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111 domain:
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112 optional name of messages domain.
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113 If omitted or None, work with simplified
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114 locale directory, as used in tracker homes:
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115 message catalogs are kept in files locale.po
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116 instead of locale/LC_MESSAGES/domain.po
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117
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118 Return the path of the first .mo file found.
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119 If nothing found, return None.
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120
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121 Automatically compile .po files if necessary.
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122
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123 """
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124 for locale in languages:
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125 if locale == "C":
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126 break
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127 if domain:
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128 basename = os.path.join(localedir, locale, "LC_MESSAGES", domain)
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129 else:
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130 basename = os.path.join(localedir, locale)
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131 # look for message catalog files, check timestamps
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132 mofile = basename + ".mo"
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133 if os.path.isfile(mofile):
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134 motime = os.path.getmtime(mofile)
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135 else:
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136 motime = 0
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137 pofile = basename + ".po"
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138 if os.path.isfile(pofile):
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139 potime = os.path.getmtime(pofile)
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140 else:
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141 potime = 0
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142 # see what we've found
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143 if motime < potime:
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144 # compile
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145 msgfmt.make(pofile, mofile)
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146 elif motime == 0:
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147 # no files found - proceed to the next locale name
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148 continue
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149 # .mo file found or made
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150 return mofile
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151 return None
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152
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153 def get_translation(language=None, tracker_home=None,
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154 translation_class=RoundupTranslations,
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155 null_translation_class=RoundupNullTranslations
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156 ):
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157 """Return Translation object for given language and domain
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158
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159 Arguments 'translation_class' and 'null_translation_class'
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160 specify the classes that are instantiated for existing
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161 and non-existing translations, respectively.
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162
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163 """
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164 mofiles = []
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165 # locale directory paths
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166 system_locale = gettext_module._default_localedir
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167 if tracker_home is not None:
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168 tracker_locale = os.path.join(tracker_home, "locale")
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169 else:
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170 tracker_locale = None
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171 # get the list of locales
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172 locales = find_locales(language)
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173 # add mofiles found in the tracker, then in the system locale directory
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174 if tracker_locale:
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175 mofiles.append(get_mofile(locales, tracker_locale))
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176 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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177 # we want to fall back to english unless english is selected language
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178 if "en" not in locales:
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179 locales = find_locales("en")
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180 # add mofiles found in the tracker, then in the system locale directory
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181 if tracker_locale:
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182 mofiles.append(get_mofile(locales, tracker_locale))
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183 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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184 # filter out elements that are not found
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185 mofiles = filter(None, mofiles)
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186 if mofiles:
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187 translator = translation_class(open(mofiles[0], "rb"))
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188 for mofile in mofiles:
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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/