Mercurial > genshi > mirror
annotate genshi/filters/i18n.py @ 594:2bbaa61b328f trunk
Add option to I18n filter to only extract strings in gettext function calls.
author | cmlenz |
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date | Mon, 13 Aug 2007 23:02:46 +0000 |
parents | b00765a115a5 |
children | badb5e5b7bb9 |
rev | line source |
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531 | 1 # -*- coding: utf-8 -*- |
2 # | |
3 # Copyright (C) 2007 Edgewall Software | |
4 # All rights reserved. | |
5 # | |
6 # This software is licensed as described in the file COPYING, which | |
7 # you should have received as part of this distribution. The terms | |
8 # are also available at http://genshi.edgewall.org/wiki/License. | |
9 # | |
10 # This software consists of voluntary contributions made by many | |
11 # individuals. For the exact contribution history, see the revision | |
12 # history and logs, available at http://genshi.edgewall.org/log/. | |
13 | |
576 | 14 """Utilities for internationalization and localization of templates. |
15 | |
16 :since: version 0.4 | |
17 """ | |
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18 |
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19 from compiler import ast |
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20 try: |
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21 frozenset |
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22 except NameError: |
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23 from sets import ImmutableSet as frozenset |
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24 from gettext import gettext |
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25 import re |
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26 |
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27 from genshi.core import Attrs, Namespace, QName, START, END, TEXT, START_NS, \ |
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28 END_NS, XML_NAMESPACE, _ensure |
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29 from genshi.template.base import Template, EXPR, SUB |
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30 from genshi.template.markup import MarkupTemplate, EXEC |
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31 |
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32 __all__ = ['Translator', 'extract'] |
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33 __docformat__ = 'restructuredtext en' |
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34 |
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35 I18N_NAMESPACE = Namespace('http://genshi.edgewall.org/i18n') |
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36 |
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37 |
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38 class Translator(object): |
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39 """Can extract and translate localizable strings from markup streams and |
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40 templates. |
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41 |
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42 For example, assume the followng template: |
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43 |
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44 >>> from genshi.template import MarkupTemplate |
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45 >>> |
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46 >>> tmpl = MarkupTemplate('''<html xmlns:py="http://genshi.edgewall.org/"> |
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47 ... <head> |
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48 ... <title>Example</title> |
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49 ... </head> |
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50 ... <body> |
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51 ... <h1>Example</h1> |
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52 ... <p>${_("Hello, %(name)s") % dict(name=username)}</p> |
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53 ... </body> |
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54 ... </html>''', filename='example.html') |
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55 |
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56 For demonstration, we define a dummy ``gettext``-style function with a |
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57 hard-coded translation table, and pass that to the `Translator` initializer: |
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58 |
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59 >>> def pseudo_gettext(string): |
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60 ... return { |
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61 ... 'Example': 'Beispiel', |
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62 ... 'Hello, %(name)s': 'Hallo, %(name)s' |
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63 ... }[string] |
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64 >>> |
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65 >>> translator = Translator(pseudo_gettext) |
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66 |
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67 Next, the translator needs to be prepended to any already defined filters |
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68 on the template: |
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69 |
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70 >>> tmpl.filters.insert(0, translator) |
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71 |
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72 When generating the template output, our hard-coded translations should be |
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73 applied as expected: |
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74 |
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75 >>> print tmpl.generate(username='Hans', _=pseudo_gettext) |
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76 <html> |
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77 <head> |
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78 <title>Beispiel</title> |
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79 </head> |
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80 <body> |
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81 <h1>Beispiel</h1> |
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82 <p>Hallo, Hans</p> |
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83 </body> |
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84 </html> |
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85 |
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86 Note that elements defining ``xml:lang`` attributes that do not contain |
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87 variable expressions are ignored by this filter. That can be used to |
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88 exclude specific parts of a template from being extracted and translated. |
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89 """ |
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90 |
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91 IGNORE_TAGS = frozenset([ |
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92 QName('script'), QName('http://www.w3.org/1999/xhtml}script'), |
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93 QName('style'), QName('http://www.w3.org/1999/xhtml}style') |
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94 ]) |
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95 INCLUDE_ATTRS = frozenset(['abbr', 'alt', 'label', 'prompt', 'standby', |
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96 'summary', 'title']) |
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97 |
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98 def __init__(self, translate=gettext, ignore_tags=IGNORE_TAGS, |
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99 include_attrs=INCLUDE_ATTRS, extract_text=True): |
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100 """Initialize the translator. |
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101 |
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102 :param translate: the translation function, for example ``gettext`` or |
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103 ``ugettext``. |
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104 :param ignore_tags: a set of tag names that should not be localized |
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105 :param include_attrs: a set of attribute names should be localized |
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106 :param extract_text: whether the content of text nodes should be |
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107 extracted, or only text in explicit ``gettext`` |
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108 function calls |
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109 """ |
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110 self.translate = translate |
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111 self.ignore_tags = ignore_tags |
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112 self.include_attrs = include_attrs |
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113 self.extract_text = extract_text |
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114 |
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115 def __call__(self, stream, ctxt=None, search_text=True, msgbuf=None): |
448 | 116 """Translate any localizable strings in the given stream. |
117 | |
118 This function shouldn't be called directly. Instead, an instance of | |
119 the `Translator` class should be registered as a filter with the | |
120 `Template` or the `TemplateLoader`, or applied as a regular stream | |
121 filter. If used as a template filter, it should be inserted in front of | |
122 all the default filters. | |
123 | |
124 :param stream: the markup event stream | |
125 :param ctxt: the template context (not used) | |
126 :param search_text: whether text nodes should be translated (used | |
127 internally) | |
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128 :param msgbuf: a `MessageBuffer` object or `None` (used internally) |
448 | 129 :return: the localized stream |
130 """ | |
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131 ignore_tags = self.ignore_tags |
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132 include_attrs = self.include_attrs |
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133 translate = self.translate |
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134 if not self.extract_text: |
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135 search_text = False |
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136 skip = 0 |
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137 i18n_msg = I18N_NAMESPACE['msg'] |
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138 ns_prefixes = [] |
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139 xml_lang = XML_NAMESPACE['lang'] |
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140 |
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141 for kind, data, pos in stream: |
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142 |
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143 # skip chunks that should not be localized |
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144 if skip: |
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145 if kind is START: |
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146 skip += 1 |
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147 elif kind is END: |
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148 skip -= 1 |
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149 yield kind, data, pos |
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150 continue |
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151 |
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152 # handle different events that can be localized |
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153 if kind is START: |
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154 tag, attrs = data |
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155 if tag in self.ignore_tags or \ |
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156 isinstance(attrs.get(xml_lang), basestring): |
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157 skip += 1 |
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158 yield kind, data, pos |
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159 continue |
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160 |
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161 new_attrs = [] |
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162 changed = False |
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163 for name, value in attrs: |
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164 newval = value |
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165 if search_text and isinstance(value, basestring): |
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166 if name in include_attrs: |
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167 newval = self.translate(value) |
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168 else: |
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169 newval = list(self(_ensure(value), ctxt, |
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170 search_text=False, msgbuf=msgbuf) |
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171 ) |
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172 if newval != value: |
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173 value = newval |
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174 changed = True |
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175 new_attrs.append((name, value)) |
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176 if changed: |
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177 attrs = new_attrs |
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178 |
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179 if msgbuf: |
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180 msgbuf.append(kind, data, pos) |
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181 continue |
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182 elif i18n_msg in attrs: |
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183 msgbuf = MessageBuffer() |
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184 attrs -= i18n_msg |
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185 |
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186 yield kind, (tag, attrs), pos |
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187 |
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188 elif search_text and kind is TEXT: |
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189 if not msgbuf: |
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190 text = data.strip() |
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191 if text: |
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192 data = data.replace(text, translate(text)) |
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193 yield kind, data, pos |
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194 else: |
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195 msgbuf.append(kind, data, pos) |
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196 |
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197 elif not skip and msgbuf and kind is END: |
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198 msgbuf.append(kind, data, pos) |
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199 if not msgbuf.depth: |
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200 for event in msgbuf.translate(translate(msgbuf.format())): |
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201 yield event |
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202 msgbuf = None |
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203 yield kind, data, pos |
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204 |
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205 elif kind is SUB: |
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206 subkind, substream = data |
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207 new_substream = list(self(substream, ctxt, msgbuf=msgbuf)) |
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208 yield kind, (subkind, new_substream), pos |
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209 |
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210 elif kind is START_NS and data[1] == I18N_NAMESPACE: |
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211 ns_prefixes.append(data[0]) |
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212 |
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213 elif kind is END_NS and data in ns_prefixes: |
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214 ns_prefixes.remove(data) |
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215 |
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216 else: |
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217 yield kind, data, pos |
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218 |
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219 GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext', 'dgettext', 'dngettext', |
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220 'ugettext', 'ungettext') |
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221 |
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222 def extract(self, stream, gettext_functions=GETTEXT_FUNCTIONS, |
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223 search_text=True, msgbuf=None): |
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224 """Extract localizable strings from the given template stream. |
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225 |
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226 For every string found, this function yields a ``(lineno, function, |
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227 message)`` tuple, where: |
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228 |
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229 * ``lineno`` is the number of the line on which the string was found, |
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230 * ``function`` is the name of the ``gettext`` function used (if the |
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231 string was extracted from embedded Python code), and |
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232 * ``message`` is the string itself (a ``unicode`` object, or a tuple |
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233 of ``unicode`` objects for functions with multiple string arguments). |
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234 |
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235 >>> from genshi.template import MarkupTemplate |
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236 >>> |
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237 >>> tmpl = MarkupTemplate('''<html xmlns:py="http://genshi.edgewall.org/"> |
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238 ... <head> |
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239 ... <title>Example</title> |
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240 ... </head> |
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241 ... <body> |
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242 ... <h1>Example</h1> |
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243 ... <p>${_("Hello, %(name)s") % dict(name=username)}</p> |
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244 ... <p>${ngettext("You have %d item", "You have %d items", num)}</p> |
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245 ... </body> |
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246 ... </html>''', filename='example.html') |
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247 >>> |
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248 >>> for lineno, funcname, message in Translator().extract(tmpl.stream): |
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249 ... print "%d, %r, %r" % (lineno, funcname, message) |
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250 3, None, u'Example' |
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251 6, None, u'Example' |
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252 7, '_', u'Hello, %(name)s' |
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253 8, 'ngettext', (u'You have %d item', u'You have %d items', None) |
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254 |
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255 :param stream: the event stream to extract strings from; can be a |
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256 regular stream or a template stream |
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257 :param gettext_functions: a sequence of function names that should be |
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258 treated as gettext-style localization |
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259 functions |
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260 :param search_text: whether the content of text nodes should be |
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261 extracted (used internally) |
469
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262 |
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263 :note: Changed in 0.4.1: For a function with multiple string arguments |
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264 (such as ``ngettext``), a single item with a tuple of strings is |
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265 yielded, instead an item for each string argument. |
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266 """ |
594
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267 if not self.extract_text: |
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268 search_text = False |
446
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269 skip = 0 |
560
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270 i18n_msg = I18N_NAMESPACE['msg'] |
522
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271 xml_lang = XML_NAMESPACE['lang'] |
446
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272 |
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273 for kind, data, pos in stream: |
549
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274 |
446
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275 if skip: |
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276 if kind is START: |
522
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277 skip += 1 |
446
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278 if kind is END: |
522
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279 skip -= 1 |
446
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280 |
549
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281 if kind is START and not skip: |
446
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282 tag, attrs = data |
560
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283 |
522
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284 if tag in self.ignore_tags or \ |
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285 isinstance(attrs.get(xml_lang), basestring): |
446
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286 skip += 1 |
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287 continue |
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288 |
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289 for name, value in attrs: |
594
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290 if search_text and isinstance(value, basestring): |
483
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291 if name in self.include_attrs: |
446
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292 text = value.strip() |
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293 if text: |
450
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294 yield pos[1], None, text |
483
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295 else: |
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296 for lineno, funcname, text in self.extract( |
485
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Follow-up to [583]: Don't extract strings from interpolated attribute values for attributes that shouldn't be included.
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297 _ensure(value), gettext_functions, |
535
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|
298 search_text=False): |
483
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299 yield lineno, funcname, text |
446
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300 |
561
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301 if msgbuf: |
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302 msgbuf.append(kind, data, pos) |
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303 elif i18n_msg in attrs: |
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304 msgbuf = MessageBuffer(pos[1]) |
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305 |
549
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306 elif not skip and search_text and kind is TEXT: |
560
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307 if not msgbuf: |
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308 text = data.strip() |
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309 if text and filter(None, [ch.isalpha() for ch in text]): |
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310 yield pos[1], None, text |
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311 else: |
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312 msgbuf.append(kind, data, pos) |
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313 |
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314 elif not skip and msgbuf and kind is END: |
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315 msgbuf.append(kind, data, pos) |
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316 if not msgbuf.depth: |
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317 yield msgbuf.lineno, None, msgbuf.format() |
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318 msgbuf = None |
446
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319 |
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|
320 elif kind is EXPR or kind is EXEC: |
565
53b37e4f2921
* The I18n extractor now handles gettext function calls that use non-string parameters as well as keyword arguments.
cmlenz
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561
diff
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|
321 for funcname, strings in extract_from_code(data, |
561
21b473243e63
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|
322 gettext_functions): |
469
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The I18n extraction now returns a tuple of strings for `ngettext` and similar functions.
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|
323 yield pos[1], funcname, strings |
446
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324 |
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|
325 elif kind is SUB: |
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|
326 subkind, substream = data |
549
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diff
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|
327 messages = self.extract(substream, gettext_functions, |
560
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328 search_text=search_text and not skip, |
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|
329 msgbuf=msgbuf) |
549
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diff
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|
330 for lineno, funcname, text in messages: |
450
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Extend the I18n extraction to also yield function names if applicable.
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diff
changeset
|
331 yield lineno, funcname, text |
528
24df908da22d
Integrated [http://babel.edgewall.org/ Babel] message extraction plugin, and added I18n doc page.
cmlenz
parents:
522
diff
changeset
|
332 |
24df908da22d
Integrated [http://babel.edgewall.org/ Babel] message extraction plugin, and added I18n doc page.
cmlenz
parents:
522
diff
changeset
|
333 |
560
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|
334 class MessageBuffer(object): |
576 | 335 """Helper class for managing localizable mixed content. |
336 | |
337 :since: version 0.5 | |
338 """ | |
560
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339 |
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340 def __init__(self, lineno=-1): |
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341 self.lineno = lineno |
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342 self.strings = [] |
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343 self.events = {} |
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344 self.depth = 1 |
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345 self.order = 1 |
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346 self.stack = [0] |
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347 |
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348 def append(self, kind, data, pos): |
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349 if kind is TEXT: |
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350 self.strings.append(data) |
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351 self.events.setdefault(self.stack[-1], []).append(None) |
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352 else: |
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|
353 if kind is START: |
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354 self.strings.append(u'[%d:' % self.order) |
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355 self.events.setdefault(self.order, []).append((kind, data, pos)) |
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|
356 self.stack.append(self.order) |
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357 self.depth += 1 |
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358 self.order += 1 |
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359 elif kind is END: |
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|
360 self.depth -= 1 |
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361 if self.depth: |
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362 self.events[self.stack[-1]].append((kind, data, pos)) |
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|
363 self.strings.append(u']') |
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|
364 self.stack.pop() |
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|
365 |
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Start implementation of advanced I18n as dicussed in #129 and the MailingList. This is not complete yet, but many simple cases work okay.
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366 def format(self): |
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367 return u''.join(self.strings).strip() |
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368 |
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Start implementation of advanced I18n as dicussed in #129 and the MailingList. This is not complete yet, but many simple cases work okay.
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369 def translate(self, string): |
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370 parts = parse_msg(string) |
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|
371 for order, string in parts: |
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|
372 events = self.events[order] |
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373 while events: |
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374 event = self.events[order].pop(0) |
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375 if not event: |
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|
376 if not string: |
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diff
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|
377 break |
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Start implementation of advanced I18n as dicussed in #129 and the MailingList. This is not complete yet, but many simple cases work okay.
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diff
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|
378 yield TEXT, string, (None, -1, -1) |
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379 if not self.events[order] or not self.events[order][0]: |
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380 break |
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381 else: |
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382 yield event |
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383 |
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384 |
561
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385 def extract_from_code(code, gettext_functions): |
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386 """Extract strings from Python bytecode. |
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387 |
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388 >>> from genshi.template.eval import Expression |
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389 |
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390 >>> expr = Expression('_("Hello")') |
565
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391 >>> list(extract_from_code(expr, Translator.GETTEXT_FUNCTIONS)) |
561
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392 [('_', u'Hello')] |
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393 |
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394 >>> expr = Expression('ngettext("You have %(num)s item", ' |
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395 ... '"You have %(num)s items", num)') |
565
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396 >>> list(extract_from_code(expr, Translator.GETTEXT_FUNCTIONS)) |
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397 [('ngettext', (u'You have %(num)s item', u'You have %(num)s items', None))] |
561
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398 |
565
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399 :param code: the `Code` object |
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400 :type code: `genshi.template.eval.Code` |
561
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401 :param gettext_functions: a sequence of function names |
576 | 402 :since: version 0.5 |
561
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403 """ |
565
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404 def _walk(node): |
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405 if isinstance(node, ast.CallFunc) and isinstance(node.node, ast.Name) \ |
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406 and node.node.name in gettext_functions: |
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407 strings = [] |
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408 for arg in node.args: |
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409 if isinstance(arg, ast.Const) \ |
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410 and isinstance(arg.value, basestring): |
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411 strings.append(unicode(arg.value)) |
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412 elif not isinstance(arg, ast.Keyword): |
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413 strings.append(None) |
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414 if len(strings) == 1: |
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415 strings = strings[0] |
561
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416 else: |
565
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417 strings = tuple(strings) |
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418 yield node.node.name, strings |
561
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419 else: |
565
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420 for child in node.getChildNodes(): |
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421 for funcname, strings in _walk(child): |
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422 yield funcname, strings |
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423 return _walk(code.ast) |
561
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424 |
560
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425 def parse_msg(string, regex=re.compile(r'(?:\[(\d+)\:)|\]')): |
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426 """Parse a message using Genshi compound message formatting. |
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427 |
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428 >>> parse_msg("See [1:Help].") |
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429 [(0, 'See '), (1, 'Help'), (0, '.')] |
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430 |
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431 >>> parse_msg("See [1:our [2:Help] page] for details.") |
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432 [(0, 'See '), (1, 'our '), (2, 'Help'), (1, ' page'), (0, ' for details.')] |
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433 |
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434 >>> parse_msg("[2:Details] finden Sie in [1:Hilfe].") |
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435 [(2, 'Details'), (0, ' finden Sie in '), (1, 'Hilfe'), (0, '.')] |
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436 |
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|
437 >>> parse_msg("[1:] Bilder pro Seite anzeigen.") |
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|
438 [(1, ''), (0, ' Bilder pro Seite anzeigen.')] |
576 | 439 |
440 :since: version 0.5 | |
560
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441 """ |
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442 parts = [] |
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443 stack = [0] |
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444 while True: |
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|
445 mo = regex.search(string) |
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446 if not mo: |
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|
447 break |
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|
448 |
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|
449 if mo.start() or stack[-1]: |
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|
450 parts.append((stack[-1], string[:mo.start()])) |
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451 string = string[mo.end():] |
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452 |
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|
453 orderno = mo.group(1) |
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|
454 if orderno is not None: |
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|
455 stack.append(int(orderno)) |
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456 else: |
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|
457 stack.pop() |
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458 if not stack: |
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|
459 break |
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|
460 |
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|
461 if string: |
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|
462 parts.append((stack[-1], string)) |
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|
463 |
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464 return parts |
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465 |
594
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Add option to I18n filter to only extract strings in gettext function calls.
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diff
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|
466 |
528
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|
467 def extract(fileobj, keywords, comment_tags, options): |
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468 """Babel extraction method for Genshi templates. |
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469 |
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|
470 :param fileobj: the file-like object the messages should be extracted from |
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471 :param keywords: a list of keywords (i.e. function names) that should be |
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472 recognized as translation functions |
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473 :param comment_tags: a list of translator tags to search for and include |
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474 in the results |
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|
475 :param options: a dictionary of additional options (optional) |
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476 :return: an iterator over ``(lineno, funcname, message, comments)`` tuples |
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477 :rtype: ``iterator`` |
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|
478 """ |
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|
479 template_class = options.get('template_class', MarkupTemplate) |
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|
480 if isinstance(template_class, basestring): |
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481 module, clsname = template_class.split(':', 1) |
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482 template_class = getattr(__import__(module, {}, {}, [clsname]), clsname) |
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|
483 encoding = options.get('encoding', None) |
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|
484 |
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Integrated [http://babel.edgewall.org/ Babel] message extraction plugin, and added I18n doc page.
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|
485 ignore_tags = options.get('ignore_tags', Translator.IGNORE_TAGS) |
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Integrated [http://babel.edgewall.org/ Babel] message extraction plugin, and added I18n doc page.
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486 if isinstance(ignore_tags, basestring): |
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487 ignore_tags = ignore_tags.split() |
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488 ignore_tags = [QName(tag) for tag in ignore_tags] |
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489 include_attrs = options.get('include_attrs', Translator.INCLUDE_ATTRS) |
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Integrated [http://babel.edgewall.org/ Babel] message extraction plugin, and added I18n doc page.
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|
490 if isinstance(include_attrs, basestring): |
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|
491 include_attrs = include_attrs.split() |
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492 include_attrs = [QName(attr) for attr in include_attrs] |
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493 |
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494 tmpl = template_class(fileobj, filename=getattr(fileobj, 'name', None), |
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495 encoding=encoding) |
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496 translator = Translator(None, ignore_tags, include_attrs) |
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497 for lineno, func, message in translator.extract(tmpl.stream, |
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498 gettext_functions=keywords): |
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499 yield lineno, func, message, [] |