author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 31 Jan 2009 18:44:00 +0000 | |
changeset 1125 | c6e8e3573fa2 |
parent 54 | 03e267d67478 |
permissions | -rw-r--r-- |
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import re |
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|
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from django.template import Node, Variable, VariableNode |
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from django.template import TemplateSyntaxError, TokenParser, Library |
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from django.template import TOKEN_TEXT, TOKEN_VAR |
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from django.utils import translation |
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from django.utils.encoding import force_unicode |
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register = Library() |
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class GetAvailableLanguagesNode(Node): |
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def __init__(self, variable): |
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self.variable = variable |
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def render(self, context): |
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from django.conf import settings |
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context[self.variable] = [(k, translation.ugettext(v)) for k, v in settings.LANGUAGES] |
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return '' |
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class GetCurrentLanguageNode(Node): |
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def __init__(self, variable): |
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self.variable = variable |
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def render(self, context): |
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context[self.variable] = translation.get_language() |
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return '' |
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class GetCurrentLanguageBidiNode(Node): |
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def __init__(self, variable): |
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self.variable = variable |
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def render(self, context): |
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context[self.variable] = translation.get_language_bidi() |
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return '' |
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class TranslateNode(Node): |
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def __init__(self, value, noop): |
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self.value = Variable(value) |
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self.noop = noop |
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def render(self, context): |
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value = self.value.resolve(context) |
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if self.noop: |
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return value |
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else: |
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return translation.ugettext(value) |
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class BlockTranslateNode(Node): |
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def __init__(self, extra_context, singular, plural=None, countervar=None, |
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counter=None): |
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self.extra_context = extra_context |
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self.singular = singular |
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self.plural = plural |
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self.countervar = countervar |
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self.counter = counter |
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def render_token_list(self, tokens): |
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result = [] |
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vars = [] |
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for token in tokens: |
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if token.token_type == TOKEN_TEXT: |
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result.append(token.contents) |
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elif token.token_type == TOKEN_VAR: |
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result.append(u'%%(%s)s' % token.contents) |
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vars.append(token.contents) |
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return ''.join(result), vars |
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def render(self, context): |
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tmp_context = {} |
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for var, val in self.extra_context.items(): |
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tmp_context[var] = val.render(context) |
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# Update() works like a push(), so corresponding context.pop() is at |
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# the end of function |
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context.update(tmp_context) |
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singular, vars = self.render_token_list(self.singular) |
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if self.plural and self.countervar and self.counter: |
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count = self.counter.resolve(context) |
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context[self.countervar] = count |
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plural, vars = self.render_token_list(self.plural) |
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result = translation.ungettext(singular, plural, count) |
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else: |
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result = translation.ugettext(singular) |
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# Escape all isolated '%' before substituting in the context. |
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result = re.sub(u'%(?!\()', u'%%', result) |
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data = dict([(v, force_unicode(context[v])) for v in vars]) |
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context.pop() |
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return result % data |
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def do_get_available_languages(parser, token): |
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""" |
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This will store a list of available languages |
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92 |
in the context. |
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Usage:: |
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{% get_available_languages as languages %} |
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{% for language in languages %} |
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98 |
... |
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{% endfor %} |
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This will just pull the LANGUAGES setting from |
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102 |
your setting file (or the default settings) and |
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103 |
put it into the named variable. |
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104 |
""" |
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args = token.contents.split() |
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if len(args) != 3 or args[1] != 'as': |
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raise TemplateSyntaxError, "'get_available_languages' requires 'as variable' (got %r)" % args |
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return GetAvailableLanguagesNode(args[2]) |
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|
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def do_get_current_language(parser, token): |
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""" |
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This will store the current language in the context. |
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|
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114 |
Usage:: |
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115 |
|
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116 |
{% get_current_language as language %} |
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This will fetch the currently active language and |
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put it's value into the ``language`` context |
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120 |
variable. |
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121 |
""" |
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args = token.contents.split() |
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if len(args) != 3 or args[1] != 'as': |
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raise TemplateSyntaxError, "'get_current_language' requires 'as variable' (got %r)" % args |
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return GetCurrentLanguageNode(args[2]) |
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126 |
|
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def do_get_current_language_bidi(parser, token): |
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""" |
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This will store the current language layout in the context. |
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130 |
|
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131 |
Usage:: |
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132 |
|
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{% get_current_language_bidi as bidi %} |
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134 |
|
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135 |
This will fetch the currently active language's layout and |
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put it's value into the ``bidi`` context variable. |
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True indicates right-to-left layout, otherwise left-to-right |
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138 |
""" |
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args = token.contents.split() |
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if len(args) != 3 or args[1] != 'as': |
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raise TemplateSyntaxError, "'get_current_language_bidi' requires 'as variable' (got %r)" % args |
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return GetCurrentLanguageBidiNode(args[2]) |
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143 |
|
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144 |
def do_translate(parser, token): |
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""" |
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This will mark a string for translation and will |
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translate the string for the current language. |
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148 |
|
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149 |
Usage:: |
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150 |
|
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{% trans "this is a test" %} |
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152 |
|
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This will mark the string for translation so it will |
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be pulled out by mark-messages.py into the .po files |
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155 |
and will run the string through the translation engine. |
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156 |
|
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157 |
There is a second form:: |
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158 |
|
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{% trans "this is a test" noop %} |
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160 |
|
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161 |
This will only mark for translation, but will return |
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162 |
the string unchanged. Use it when you need to store |
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values into forms that should be translated later on. |
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164 |
|
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You can use variables instead of constant strings |
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166 |
to translate stuff you marked somewhere else:: |
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167 |
|
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{% trans variable %} |
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169 |
|
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This will just try to translate the contents of |
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the variable ``variable``. Make sure that the string |
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in there is something that is in the .po file. |
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173 |
""" |
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174 |
class TranslateParser(TokenParser): |
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def top(self): |
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value = self.value() |
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if self.more(): |
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178 |
if self.tag() == 'noop': |
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noop = True |
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180 |
else: |
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raise TemplateSyntaxError, "only option for 'trans' is 'noop'" |
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182 |
else: |
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noop = False |
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return (value, noop) |
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value, noop = TranslateParser(token.contents).top() |
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return TranslateNode(value, noop) |
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187 |
|
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188 |
def do_block_translate(parser, token): |
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189 |
""" |
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190 |
This will translate a block of text with parameters. |
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191 |
|
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192 |
Usage:: |
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193 |
|
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194 |
{% blocktrans with foo|filter as bar and baz|filter as boo %} |
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This is {{ bar }} and {{ boo }}. |
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196 |
{% endblocktrans %} |
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197 |
|
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198 |
Additionally, this supports pluralization:: |
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199 |
|
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200 |
{% blocktrans count var|length as count %} |
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There is {{ count }} object. |
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202 |
{% plural %} |
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There are {{ count }} objects. |
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{% endblocktrans %} |
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205 |
|
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This is much like ngettext, only in template syntax. |
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207 |
""" |
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208 |
class BlockTranslateParser(TokenParser): |
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209 |
def top(self): |
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countervar = None |
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counter = None |
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extra_context = {} |
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while self.more(): |
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tag = self.tag() |
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if tag == 'with' or tag == 'and': |
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value = self.value() |
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if self.tag() != 'as': |
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raise TemplateSyntaxError, "variable bindings in 'blocktrans' must be 'with value as variable'" |
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extra_context[self.tag()] = VariableNode( |
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parser.compile_filter(value)) |
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221 |
elif tag == 'count': |
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counter = parser.compile_filter(self.value()) |
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if self.tag() != 'as': |
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raise TemplateSyntaxError, "counter specification in 'blocktrans' must be 'count value as variable'" |
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countervar = self.tag() |
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226 |
else: |
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raise TemplateSyntaxError, "unknown subtag %s for 'blocktrans' found" % tag |
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return (countervar, counter, extra_context) |
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229 |
|
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230 |
countervar, counter, extra_context = BlockTranslateParser(token.contents).top() |
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231 |
|
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singular = [] |
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plural = [] |
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234 |
while parser.tokens: |
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token = parser.next_token() |
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Todd Larsen <tlarsen@google.com>
parents:
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changeset
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236 |
if token.token_type in (TOKEN_VAR, TOKEN_TEXT): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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237 |
singular.append(token) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
238 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
239 |
break |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
240 |
if countervar and counter: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
241 |
if token.contents.strip() != 'plural': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
242 |
raise TemplateSyntaxError, "'blocktrans' doesn't allow other block tags inside it" |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
243 |
while parser.tokens: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
244 |
token = parser.next_token() |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
245 |
if token.token_type in (TOKEN_VAR, TOKEN_TEXT): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
246 |
plural.append(token) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
247 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
248 |
break |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
249 |
if token.contents.strip() != 'endblocktrans': |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
250 |
raise TemplateSyntaxError, "'blocktrans' doesn't allow other block tags (seen %r) inside it" % token.contents |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
251 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
252 |
return BlockTranslateNode(extra_context, singular, plural, countervar, |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
253 |
counter) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
254 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
255 |
register.tag('get_available_languages', do_get_available_languages) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
256 |
register.tag('get_current_language', do_get_current_language) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
257 |
register.tag('get_current_language_bidi', do_get_current_language_bidi) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
258 |
register.tag('trans', do_translate) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
259 |
register.tag('blocktrans', do_block_translate) |