Mercurial > babel > mirror
annotate babel/messages/extract.py @ 138:bd3b47492396 trunk
Genshi extraction method has moved to Genshi project. Closes #13.
author | cmlenz |
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date | Wed, 20 Jun 2007 10:02:04 +0000 |
parents | c75026f5417f |
children | 14fe2a8fb842 |
rev | line source |
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1 | 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://babel.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://babel.edgewall.org/log/. | |
13 | |
14 """Basic infrastructure for extracting localizable messages from source files. | |
15 | |
16 This module defines an extensible system for collecting localizable message | |
17 strings from a variety of sources. A native extractor for Python source files | |
18 is builtin, extractors for other sources can be added using very simple plugins. | |
19 | |
20 The main entry points into the extraction functionality are the functions | |
21 `extract_from_dir` and `extract_from_file`. | |
22 """ | |
23 | |
24 import os | |
44 | 25 try: |
26 set | |
27 except NameError: | |
28 from sets import Set as set | |
1 | 29 import sys |
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30 from tokenize import generate_tokens, NAME, OP, STRING, COMMENT |
1 | 31 |
44 | 32 from babel.util import pathmatch, relpath |
1 | 33 |
34 __all__ = ['extract', 'extract_from_dir', 'extract_from_file'] | |
35 __docformat__ = 'restructuredtext en' | |
36 | |
37 GROUP_NAME = 'babel.extractors' | |
38 | |
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39 DEFAULT_KEYWORDS = { |
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40 '_': None, |
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41 'gettext': None, |
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42 'ngettext': (1, 2), |
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43 'ugettext': None, |
4130d9c6cb34
Both Babel's [source:trunk/babel/catalog/frontend.py frontend] and [source:trunk/babel/catalog/extract.py extract] now handle keyword indices. Also added an extra boolean flag so that the default keywords defined by Babel are not included in the keywords to search for when extracting strings.
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44 'ungettext': (1, 2), |
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45 'dgettext': (2,), |
4130d9c6cb34
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46 'dngettext': (2, 3), |
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47 } |
1 | 48 |
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49 DEFAULT_MAPPING = [('**.py', 'python')] |
1 | 50 |
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51 def extract_from_dir(dirname=os.getcwd(), method_map=DEFAULT_MAPPING, |
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52 options_map=None, keywords=DEFAULT_KEYWORDS, |
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53 comment_tags=(), callback=None): |
1 | 54 """Extract messages from any source files found in the given directory. |
55 | |
56 This function generates tuples of the form: | |
57 | |
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58 ``(filename, lineno, message, comments)`` |
1 | 59 |
44 | 60 Which extraction method is used per file is determined by the `method_map` |
61 parameter, which maps extended glob patterns to extraction method names. | |
62 For example, the following is the default mapping: | |
1 | 63 |
62
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64 >>> method_map = [ |
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65 ... ('**.py', 'python') |
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66 ... ] |
1 | 67 |
68 This basically says that files with the filename extension ".py" at any | |
69 level inside the directory should be processed by the "python" extraction | |
44 | 70 method. Files that don't match any of the mapping patterns are ignored. See |
71 the documentation of the `pathmatch` function for details on the pattern | |
72 syntax. | |
1 | 73 |
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74 The following extended mapping would also use the "genshi" extraction |
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75 method on any file in "templates" subdirectory: |
1 | 76 |
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77 >>> method_map = [ |
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78 ... ('**/templates/**.*', 'genshi'), |
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79 ... ('**.py', 'python') |
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80 ... ] |
44 | 81 |
82 The dictionary provided by the optional `options_map` parameter augments | |
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83 these mappings. It uses extended glob patterns as keys, and the values are |
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84 dictionaries mapping options names to option values (both strings). |
44 | 85 |
86 The glob patterns of the `options_map` do not necessarily need to be the | |
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87 same as those used in the method mapping. For example, while all files in |
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88 the ``templates`` folders in an application may be Genshi applications, the |
44 | 89 options for those files may differ based on extension: |
90 | |
91 >>> options_map = { | |
92 ... '**/templates/**.txt': { | |
93 ... 'template_class': 'genshi.template.text.TextTemplate', | |
94 ... 'encoding': 'latin-1' | |
95 ... }, | |
96 ... '**/templates/**.html': { | |
97 ... 'include_attrs': '' | |
98 ... } | |
1 | 99 ... } |
100 | |
101 :param dirname: the path to the directory to extract messages from | |
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102 :param method_map: a list of ``(pattern, method)`` tuples that maps of |
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103 extraction method names to extended glob patterns |
44 | 104 :param options_map: a dictionary of additional options (optional) |
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105 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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106 that should be recognized as translation functions) to |
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107 tuples that specify which of their arguments contain |
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108 localizable strings |
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109 :param comment_tags: a list of tags of translator comments to search for |
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110 and include in the results |
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111 :param callback: a function that is called for every file that message are |
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112 extracted from, just before the extraction itself is |
75 | 113 performed; the function is passed the filename, the name |
114 of the extraction method and and the options dictionary as | |
115 positional arguments, in that order | |
1 | 116 :return: an iterator over ``(filename, lineno, funcname, message)`` tuples |
117 :rtype: ``iterator`` | |
44 | 118 :see: `pathmatch` |
1 | 119 """ |
44 | 120 if options_map is None: |
121 options_map = {} | |
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122 |
44 | 123 absname = os.path.abspath(dirname) |
124 for root, dirnames, filenames in os.walk(absname): | |
125 for subdir in dirnames: | |
126 if subdir.startswith('.') or subdir.startswith('_'): | |
127 dirnames.remove(subdir) | |
128 for filename in filenames: | |
129 filename = relpath( | |
130 os.path.join(root, filename).replace(os.sep, '/'), | |
131 dirname | |
132 ) | |
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133 for pattern, method in method_map: |
44 | 134 if pathmatch(pattern, filename): |
135 filepath = os.path.join(absname, filename) | |
136 options = {} | |
137 for opattern, odict in options_map.items(): | |
138 if pathmatch(opattern, filename): | |
139 options = odict | |
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140 if callback: |
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141 callback(filename, method, options) |
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142 for lineno, message, comments in \ |
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143 extract_from_file(method, filepath, |
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144 keywords=keywords, |
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145 comment_tags=comment_tags, |
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146 options=options): |
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147 yield filename, lineno, message, comments |
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148 break |
1 | 149 |
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150 def extract_from_file(method, filename, keywords=DEFAULT_KEYWORDS, |
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151 comment_tags=(), options=None): |
1 | 152 """Extract messages from a specific file. |
153 | |
154 This function returns a list of tuples of the form: | |
155 | |
156 ``(lineno, funcname, message)`` | |
157 | |
158 :param filename: the path to the file to extract messages from | |
159 :param method: a string specifying the extraction method (.e.g. "python") | |
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160 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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161 that should be recognized as translation functions) to |
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162 tuples that specify which of their arguments contain |
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163 localizable strings |
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164 :param comment_tags: a list of translator tags to search for and include |
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165 in the results |
1 | 166 :param options: a dictionary of additional options (optional) |
167 :return: the list of extracted messages | |
168 :rtype: `list` | |
169 """ | |
170 fileobj = open(filename, 'U') | |
171 try: | |
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172 return list(extract(method, fileobj, keywords, comment_tags, options)) |
1 | 173 finally: |
174 fileobj.close() | |
175 | |
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176 def extract(method, fileobj, keywords=DEFAULT_KEYWORDS, comment_tags=(), |
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177 options=None): |
1 | 178 """Extract messages from the given file-like object using the specified |
179 extraction method. | |
180 | |
181 This function returns a list of tuples of the form: | |
182 | |
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183 ``(lineno, message, comments)`` |
1 | 184 |
185 The implementation dispatches the actual extraction to plugins, based on the | |
186 value of the ``method`` parameter. | |
187 | |
188 >>> source = '''# foo module | |
189 ... def run(argv): | |
190 ... print _('Hello, world!') | |
191 ... ''' | |
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192 |
1 | 193 >>> from StringIO import StringIO |
194 >>> for message in extract('python', StringIO(source)): | |
195 ... print message | |
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196 (3, 'Hello, world!', []) |
1 | 197 |
198 :param method: a string specifying the extraction method (.e.g. "python") | |
199 :param fileobj: the file-like object the messages should be extracted from | |
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200 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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201 that should be recognized as translation functions) to |
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202 tuples that specify which of their arguments contain |
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203 localizable strings |
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204 :param comment_tags: a list of translator tags to search for and include |
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205 in the results |
1 | 206 :param options: a dictionary of additional options (optional) |
207 :return: the list of extracted messages | |
208 :rtype: `list` | |
209 :raise ValueError: if the extraction method is not registered | |
210 """ | |
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211 from pkg_resources import working_set |
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212 |
1 | 213 for entry_point in working_set.iter_entry_points(GROUP_NAME, method): |
214 func = entry_point.load(require=True) | |
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215 results = func(fileobj, keywords.keys(), comment_tags, |
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216 options=options or {}) |
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217 for lineno, funcname, messages, comments in results: |
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218 if isinstance(messages, (list, tuple)): |
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219 msgs = [] |
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220 for index in keywords[funcname]: |
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221 msgs.append(messages[index - 1]) |
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222 messages = tuple(msgs) |
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223 if len(messages) == 1: |
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224 messages = messages[0] |
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225 yield lineno, messages, comments |
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226 return |
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227 |
1 | 228 raise ValueError('Unknown extraction method %r' % method) |
229 | |
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230 def extract_nothing(fileobj, keywords, comment_tags, options): |
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231 """Pseudo extractor that does not actually extract anything, but simply |
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232 returns an empty list. |
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233 """ |
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234 return [] |
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235 |
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236 def extract_python(fileobj, keywords, comment_tags, options): |
1 | 237 """Extract messages from Python source code. |
238 | |
239 :param fileobj: the file-like object the messages should be extracted from | |
240 :param keywords: a list of keywords (i.e. function names) that should be | |
241 recognized as translation functions | |
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242 :param comment_tags: a list of translator tags to search for and include |
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243 in the results |
1 | 244 :param options: a dictionary of additional options (optional) |
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245 :return: an iterator over ``(lineno, funcname, message, comments)`` tuples |
1 | 246 :rtype: ``iterator`` |
247 """ | |
248 funcname = None | |
249 lineno = None | |
250 buf = [] | |
251 messages = [] | |
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252 translator_comments = [] |
1 | 253 in_args = False |
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254 in_translator_comments = False |
1 | 255 |
256 tokens = generate_tokens(fileobj.readline) | |
257 for tok, value, (lineno, _), _, _ in tokens: | |
258 if funcname and tok == OP and value == '(': | |
259 in_args = True | |
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260 elif tok == COMMENT: |
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261 # Strip the comment token from the line |
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262 value = value[1:].strip() |
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263 if in_translator_comments is True and \ |
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264 translator_comments[-1][0] == lineno - 1: |
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265 # We're already inside a translator comment, continue appending |
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266 # XXX: Should we check if the programmer keeps adding the |
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267 # comment_tag for every comment line??? probably not! |
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268 translator_comments.append((lineno, value)) |
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269 continue |
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270 # If execution reaches this point, let's see if comment line |
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271 # starts with one of the comment tags |
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272 for comment_tag in comment_tags: |
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273 if value.startswith(comment_tag): |
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274 if in_translator_comments is not True: |
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275 in_translator_comments = True |
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276 comment = value[len(comment_tag):].strip() |
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277 translator_comments.append((lineno, comment)) |
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278 break |
1 | 279 elif funcname and in_args: |
280 if tok == OP and value == ')': | |
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281 in_args = in_translator_comments = False |
1 | 282 if buf: |
283 messages.append(''.join(buf)) | |
284 del buf[:] | |
285 if filter(None, messages): | |
286 if len(messages) > 1: | |
287 messages = tuple(messages) | |
288 else: | |
289 messages = messages[0] | |
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290 # Comments don't apply unless they immediately preceed the |
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291 # message |
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292 if translator_comments and \ |
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293 translator_comments[-1][0] < lineno - 1: |
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294 translator_comments = [] |
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295 |
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296 yield (lineno, funcname, messages, |
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297 [comment[1] for comment in translator_comments]) |
1 | 298 funcname = lineno = None |
299 messages = [] | |
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300 translator_comments = [] |
1 | 301 elif tok == STRING: |
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302 # Unwrap quotes in a safe manner |
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303 buf.append(eval(value, {'__builtins__':{}}, {})) |
1 | 304 elif tok == OP and value == ',': |
305 messages.append(''.join(buf)) | |
306 del buf[:] | |
307 elif funcname: | |
308 funcname = None | |
309 elif tok == NAME and value in keywords: | |
310 funcname = value |