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annotate roundup/i18n.py @ 2810:ca541343c3ae

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straighten "if not ... else" logic; fix: main message catalog was also used as fallback
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Sat, 23 Oct 2004 14:20:57 +0000
parents 845e87d5e3ba
children 5809f81fba24
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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 1.12 2004-10-23 14:20:57 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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24
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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 None:
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168 tracker_locale = None
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169 else:
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170 tracker_locale = os.path.join(tracker_home, "locale")
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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[1:]:
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189 # note: current implementation of gettext_module
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190 # always adds fallback to the end of the fallback chain.
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191 translator.add_fallback(translation_class(open(mofile, "rb")))
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192 else:
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193 translator = null_translation_class()
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194 return translator
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195
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196 # static translations object
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197 translation = get_translation()
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198 # static translation functions
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199 _ = gettext = translation.gettext
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200 ugettext = translation.ugettext
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201 ngettext = translation.ngettext
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202 ungettext = translation.ungettext
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203
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204 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/