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annotate roundup/i18n.py @ 6206:b6f2cf872d2e

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Expand sunset header explanation, fix formating missing `.
author John Rouillard <rouilj@ieee.org>
date Fri, 26 Jun 2020 18:44:26 -0400
parents 289cee42cc19
children 808f7a8ed2b6
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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 gettext as gettext_module
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39 import os
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40
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41 from roundup import msgfmt
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42 from roundup.anypy.strings import is_us
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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
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68 def find_locales(language=None):
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69 """Return normalized list of locale names to try for given language
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70
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71 Argument 'language' may be a single language code or a list of codes.
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72 If 'language' is omitted or None, use locale settings in OS environment.
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73
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74 """
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75 # body of this function is borrowed from gettext_module.find()
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76 if language is None:
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77 languages = []
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78 for envar in ('LANGUAGE', 'LC_ALL', 'LC_MESSAGES', 'LANG'):
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79 val = os.environ.get(envar)
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80 if val:
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81 languages = val.split(':')
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82 break
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83 elif is_us(language):
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84 languages = [language]
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85 else:
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86 # 'language' must be iterable
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87 languages = language
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88 # now normalize and expand the languages
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89 nelangs = []
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90 for lang in languages:
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91 for nelang in gettext_module._expand_lang(lang):
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92 if nelang not in nelangs:
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93 nelangs.append(nelang)
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94 return nelangs
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96
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97 def get_mofile(languages, localedir, domain=None):
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98 """Return the first of .mo files found in localedir for languages
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99
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100 Parameters:
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101 languages:
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102 list of locale names to try
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103 localedir:
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104 path to directory containing locale files.
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105 Usually this is either gettext_module._default_localedir
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106 or 'locale' subdirectory in the tracker home.
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107 domain:
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108 optional name of messages domain.
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109 If omitted or None, work with simplified
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110 locale directory, as used in tracker homes:
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111 message catalogs are kept in files locale.po
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112 instead of locale/LC_MESSAGES/domain.po
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113
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114 Return the path of the first .mo file found.
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115 If nothing found, return None.
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116
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117 Automatically compile .po files if necessary.
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118
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119 """
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120 for locale in languages:
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121 if locale == "C":
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122 break
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123 if domain:
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124 basename = os.path.join(localedir, locale, "LC_MESSAGES", domain)
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125 else:
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126 basename = os.path.join(localedir, locale)
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127 # look for message catalog files, check timestamps
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128 mofile = basename + ".mo"
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129 if os.path.isfile(mofile):
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130 motime = os.path.getmtime(mofile)
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131 else:
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132 motime = 0
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133 pofile = basename + ".po"
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134 if os.path.isfile(pofile):
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135 potime = os.path.getmtime(pofile)
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136 else:
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137 potime = 0
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138 # see what we've found
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139 if motime < potime:
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140 # compile
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141 mo = msgfmt.Msgfmt(pofile).get()
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142 open(mofile, 'wb').write(mo)
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143 elif motime == 0:
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144 # no files found - proceed to the next locale name
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145 continue
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146 # .mo file found or made
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147 return mofile
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148 return None
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149
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150
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151 def get_translation(language=None, tracker_home=None,
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152 translation_class=RoundupTranslations,
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153 null_translation_class=RoundupNullTranslations):
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154 """Return Translation object for given language and domain
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155
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156 Argument 'language' may be a single language code or a list of codes.
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157 If 'language' is omitted or None, use locale settings in OS environment.
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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 if tracker_home is None:
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167 tracker_locale = None
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168 else:
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169 tracker_locale = os.path.join(tracker_home, "locale")
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170 # get the list of locales
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171 locales = find_locales(language)
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172 # add mofiles found in the tracker, then in the system locale directory
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173 if tracker_locale:
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174 mofiles.append(get_mofile(locales, tracker_locale))
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175 for system_locale in LOCALE_DIRS:
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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 for system_locale in LOCALE_DIRS:
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184 mofiles.append(get_mofile(locales, system_locale, DOMAIN))
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185 # filter out elements that are not found
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186 mofiles = filter(None, mofiles)
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187 translator = None
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188 for mofile in mofiles:
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189 try:
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190 mo = open(mofile, "rb")
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191 if translator is None:
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192 translator = translation_class(mo)
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193 else:
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194 # note: current implementation of gettext_module
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195 # always adds fallback to the end of the fallback chain.
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196 translator.add_fallback(translation_class(mo))
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197 except IOError:
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198 # ignore unreadable .mo files
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199 pass
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200 if translator is None:
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201 translator = null_translation_class()
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202 return translator
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203
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204
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205 # static translations object
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206 translation = get_translation()
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207 # static translation functions
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208 _ = gettext = translation.gettext
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209 try:
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210 # Python 2.
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211 ugettext = translation.ugettext
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212 except AttributeError:
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213 # Python 3.
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214 ugettext = translation.gettext
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215 ngettext = translation.ngettext
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216 try:
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217 # Python 2.
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218 ungettext = translation.ungettext
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219 except AttributeError:
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220 # Python 3.
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221 ungettext = translation.ngettext
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222
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223 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/