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annotate roundup/cgi/TranslationService.py @ 3981:82e116d515d2

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another psql 8.3 compat fix
author Richard Jones <richard@users.sourceforge.net>
date Thu, 07 Aug 2008 06:05:53 +0000
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1 # TranslationService for Roundup templates
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2 #
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3 # This module is free software, you may redistribute it
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4 # and/or modify under the same terms as Python.
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5 #
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6 # This module provides National Language Support
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7 # for Roundup templating - much like roundup.i18n
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8 # module for Roundup command line interface.
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9 # The only difference is that translator objects
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10 # returned by get_translation() have one additional
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11 # method which is used by TAL engines:
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12 #
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13 # translate(domain, msgid, mapping, context, target_language, default)
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14 #
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15
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16 __version__ = "$Revision: 1.5 $"[11:-2]
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17 __date__ = "$Date: 2008-08-07 05:51:32 $"[7:-2]
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18
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19 from roundup import i18n
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20 from roundup.cgi.PageTemplates import Expressions, PathIterator, TALES
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21 from roundup.cgi.TAL import TALInterpreter
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22
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23 ### Translation classes
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24
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25 class TranslationServiceMixin:
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26
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27 OUTPUT_ENCODING = "utf-8"
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28
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29 def translate(self, domain, msgid, mapping=None,
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30 context=None, target_language=None, default=None
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31 ):
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32 _msg = self.gettext(msgid)
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33 #print ("TRANSLATE", msgid, _msg, mapping, context)
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34 _msg = TALInterpreter.interpolate(_msg, mapping)
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35 return _msg
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36
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37 def gettext(self, msgid):
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38 if not isinstance(msgid, unicode):
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39 msgid = unicode(msgid, 'utf8')
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40 msgtrans=self.ugettext(msgid)
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41 if not isinstance(msgtrans,unicode):
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42 msgtrans=unicode(msgtrans, 'utf8')
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43 return msgtrans.encode(self.OUTPUT_ENCODING)
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44
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45 def ngettext(self, singular, plural, number):
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46 if not isinstance(singular, unicode):
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47 singular = unicode(singular, 'utf8')
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48 if not isinstance(plural, unicode):
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49 plural = unicode(plural, 'utf8')
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50 msgtrans=self.ungettext(singular, plural, number)
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51 if not isinstance(msgtrans,unicode):
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52 msgtrans=unicode(msgtrans, 'utf8')
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53 return msgtrans.encode(self.OUTPUT_ENCODING)
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54
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55 class TranslationService(TranslationServiceMixin, i18n.RoundupTranslations):
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56 pass
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57
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58 class NullTranslationService(TranslationServiceMixin,
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59 i18n.RoundupNullTranslations):
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60 def ugettext(self, message):
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61 if self._fallback:
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62 return self._fallback.ugettext(message)
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63 # Sometimes the untranslatable message is a UTF-8 encoded string
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64 # (thanks to PageTemplate's internals).
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65 if not isinstance(message, unicode):
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66 return unicode(message, 'utf8')
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67 return message
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68
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69 ### TAL patching
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70 #
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71 # Template Attribute Language (TAL) uses only global translation service,
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72 # which is not thread-safe. We will use context variable 'i18n'
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73 # to access request-dependent transalation service (with domain
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74 # and target language set during initializations of the roundup
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75 # client interface.
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76 #
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77
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78 class Context(TALES.Context):
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79
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80 def __init__(self, compiler, contexts):
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81 TALES.Context.__init__(self, compiler, contexts)
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82 if not self.contexts.get('i18n', None):
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83 # if the context contains no TranslationService,
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84 # create default one
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85 self.contexts['i18n'] = get_translation()
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86 self.i18n = self.contexts['i18n']
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87
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88 def translate(self, domain, msgid, mapping=None,
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89 context=None, target_language=None, default=None):
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90 if context is None:
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91 context = self.contexts.get('here')
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92 return self.i18n.translate(domain, msgid,
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93 mapping=mapping, context=context, default=default,
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94 target_language=target_language)
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95
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96 class Engine(TALES.Engine):
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97
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98 def getContext(self, contexts=None, **kwcontexts):
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99 if contexts is not None:
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100 if kwcontexts:
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101 kwcontexts.update(contexts)
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102 else:
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103 kwcontexts = contexts
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104 return Context(self, kwcontexts)
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105
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106 # patching TAL like this is a dirty hack,
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107 # but i see no other way to specify different Context class
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108 Expressions._engine = Engine(PathIterator.Iterator)
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109 Expressions.installHandlers(Expressions._engine)
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110
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111 ### main API function
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112
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113 def get_translation(language=None, tracker_home=None,
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114 translation_class=TranslationService,
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115 null_translation_class=NullTranslationService
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116 ):
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117 """Return Translation object for given language and domain
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118
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119 Arguments 'translation_class' and 'null_translation_class'
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120 specify the classes that are instantiated for existing
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121 and non-existing translations, respectively.
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122 """
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123 return i18n.get_translation(language=language,
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124 tracker_home=tracker_home,
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125 translation_class=translation_class,
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126 null_translation_class=null_translation_class)
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127
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128 # vim: set et sts=4 sw=4 :
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