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annotate roundup/i18n.py @ 2355:6c2d8183a235

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export unicode functions and DOMAIN name; added ngettext emulation for earlier python versions (2.1, 2.2); added get_translation() function to find different translations at runtime
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Sat, 22 May 2004 14:40:17 +0000
parents 27e4478df7c0
children c2db20eca3fa
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rev   line source
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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 1.7 2004-05-22 14:40:17 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
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42 # Roundup text domain
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43 DOMAIN = "roundup"
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44
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45 # first, we try to import gettext; this probably never fails, but we make
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46 # sure we survive this anyway
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47 try:
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48 import gettext as gettext_module
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49 except ImportError:
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50 gettext_module = None
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51
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52 # use or emulate features of gettext_module
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53 if not gettext_module:
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54 # no gettext engine available.
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55 # implement emulation for Translations class
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56 # and translation() function
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57 class RoundupNullTranslations:
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58 """Dummy Translations class
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59
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60 Only methods used by Roundup are implemented.
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61
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62 """
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63 def add_fallback(self, fallback):
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64 pass
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65 def gettext(self, text):
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66 return text
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67 def ugettext(self, text):
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68 return unicode(text)
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69 def ngettext(self, singular, plural, count):
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70 if count == 1: return singular
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71 return plural
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72 def ungettext(self, singular, plural, count):
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73 return unicode(self.ngettext(singular, plural, count))
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74
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75 RoundupTranslations = RoundupNullTranslations
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76
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77 def translation(domain, localedir=None, languages=None, class_=None):
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78 """Always raise IOError (no message catalogs available)"""
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79 raise IOError(errno.ENOENT,
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80 "No translation file found for domain", domain)
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81
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82 elif not hasattr(gettext_module.GNUTranslations, "ngettext"):
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83 # prior to 2.3, there was no plural forms. mix simple emulation in
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84 class PluralFormsMixIn:
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85 def ngettext(self, singular, plural, count):
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86 if count == 1:
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87 _msg = singular
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88 else:
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89 _msg = plural
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90 return self.gettext(_msg)
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91 def ngettext(self, singular, plural, count):
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92 if count == 1:
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93 _msg = singular
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94 else:
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95 _msg = plural
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96 return self.gettext(_msg)
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97 class RoundupNullTranslations(
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98 gettext_module.NullTranslations, PluralFormsMixIn
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99 ):
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100 pass
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101 class RoundupTranslations(
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102 gettext_module.GNUTranslations, PluralFormsMixIn
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103 ):
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104 pass
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105 # lookup function is available
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106 translation = gettext_module.translation
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107 else:
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108 # gettext_module has everything needed
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109 RoundupNullTranslations = gettext_module.NullTranslations
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110 RoundupTranslations = gettext_module.GNUTranslations
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111 translation = gettext_module.translation
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112
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113
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114 def get_translation(language=None, domain=DOMAIN):
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115 """Return Translation object for given language and domain"""
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116 if language:
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117 _languages = [language]
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118 else:
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119 # use OS environment
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120 _languages = None
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121 # except for english ("en") language, add english fallback if available
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122 try:
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123 _fallback = translation(domain=domain, languages=["en"],
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124 class_=RoundupTranslations)
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125 except IOError:
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126 # no .mo files found
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127 _fallback = None
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128 # get the translation
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129 try:
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130 _translation = translation(domain=domain, languages=_languages,
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131 class_=RoundupTranslations)
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132 except IOError:
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133 _translation = None
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134 # see what's found
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135 if _translation and _fallback:
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136 _translation.add_fallback(_fallback)
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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137 elif _fallback:
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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138 _translation = _fallback
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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139 elif not _translation:
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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140 _translation = RoundupNullTranslations()
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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141 return _translation
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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142
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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143 # static translations object
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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144 translation = get_translation()
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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145 # static translation functions
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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146 _ = gettext = translation.gettext
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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147 ugettext = translation.ugettext
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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148 ngettext = translation.ngettext
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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149 ungettext = translation.ungettext
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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150
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Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2326
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151 # vim: set filetype=python sts=4 sw=4 et si
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