Mercurial > babel > mirror
annotate babel/messages/extract.py @ 560:86524be05b60 trunk
fix docstring for babel.messages.extract() so it mentions the correct return type
author | fschwarz |
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date | Sat, 03 Sep 2011 08:31:43 +0000 |
parents | ca203b2af83c |
children | 1b801a0cb2cb |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
530 | 3 # Copyright (C) 2007-2011 Edgewall Software |
1 | 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 | |
25 import sys | |
162 | 26 from tokenize import generate_tokens, COMMENT, NAME, OP, STRING |
1 | 27 |
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28 from babel.util import parse_encoding, pathmatch, relpath |
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29 from textwrap import dedent |
1 | 30 |
31 __all__ = ['extract', 'extract_from_dir', 'extract_from_file'] | |
32 __docformat__ = 'restructuredtext en' | |
33 | |
34 GROUP_NAME = 'babel.extractors' | |
35 | |
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36 DEFAULT_KEYWORDS = { |
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37 '_': None, |
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38 'gettext': None, |
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39 'ngettext': (1, 2), |
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40 'ugettext': None, |
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41 'ungettext': (1, 2), |
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42 'dgettext': (2,), |
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43 'dngettext': (2, 3), |
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44 'N_': None |
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45 } |
1 | 46 |
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47 DEFAULT_MAPPING = [('**.py', 'python')] |
1 | 48 |
222 | 49 empty_msgid_warning = ( |
50 '%s: warning: Empty msgid. It is reserved by GNU gettext: gettext("") ' | |
51 'returns the header entry with meta information, not the empty string.') | |
52 | |
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53 |
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54 def _strip_comment_tags(comments, tags): |
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55 """Helper function for `extract` that strips comment tags from strings |
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56 in a list of comment lines. This functions operates in-place. |
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57 """ |
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58 def _strip(line): |
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59 for tag in tags: |
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60 if line.startswith(tag): |
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61 return line[len(tag):].strip() |
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62 return line |
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63 comments[:] = map(_strip, comments) |
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64 |
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65 |
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66 def extract_from_dir(dirname=os.getcwd(), method_map=DEFAULT_MAPPING, |
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67 options_map=None, keywords=DEFAULT_KEYWORDS, |
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68 comment_tags=(), callback=None, strip_comment_tags=False): |
1 | 69 """Extract messages from any source files found in the given directory. |
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70 |
1 | 71 This function generates tuples of the form: |
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72 |
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73 ``(filename, lineno, message, comments)`` |
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74 |
44 | 75 Which extraction method is used per file is determined by the `method_map` |
76 parameter, which maps extended glob patterns to extraction method names. | |
77 For example, the following is the default mapping: | |
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78 |
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79 >>> method_map = [ |
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80 ... ('**.py', 'python') |
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81 ... ] |
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82 |
1 | 83 This basically says that files with the filename extension ".py" at any |
84 level inside the directory should be processed by the "python" extraction | |
44 | 85 method. Files that don't match any of the mapping patterns are ignored. See |
86 the documentation of the `pathmatch` function for details on the pattern | |
87 syntax. | |
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88 |
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89 The following extended mapping would also use the "genshi" extraction |
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90 method on any file in "templates" subdirectory: |
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91 |
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92 >>> method_map = [ |
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93 ... ('**/templates/**.*', 'genshi'), |
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94 ... ('**.py', 'python') |
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95 ... ] |
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96 |
44 | 97 The dictionary provided by the optional `options_map` parameter augments |
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98 these mappings. It uses extended glob patterns as keys, and the values are |
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99 dictionaries mapping options names to option values (both strings). |
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100 |
44 | 101 The glob patterns of the `options_map` do not necessarily need to be the |
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102 same as those used in the method mapping. For example, while all files in |
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103 the ``templates`` folders in an application may be Genshi applications, the |
44 | 104 options for those files may differ based on extension: |
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105 |
44 | 106 >>> options_map = { |
107 ... '**/templates/**.txt': { | |
144 | 108 ... 'template_class': 'genshi.template:TextTemplate', |
44 | 109 ... 'encoding': 'latin-1' |
110 ... }, | |
111 ... '**/templates/**.html': { | |
112 ... 'include_attrs': '' | |
113 ... } | |
1 | 114 ... } |
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115 |
1 | 116 :param dirname: the path to the directory to extract messages from |
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117 :param method_map: a list of ``(pattern, method)`` tuples that maps of |
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118 extraction method names to extended glob patterns |
44 | 119 :param options_map: a dictionary of additional options (optional) |
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120 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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121 that should be recognized as translation functions) to |
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122 tuples that specify which of their arguments contain |
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123 localizable strings |
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124 :param comment_tags: a list of tags of translator comments to search for |
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125 and include in the results |
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126 :param callback: a function that is called for every file that message are |
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127 extracted from, just before the extraction itself is |
75 | 128 performed; the function is passed the filename, the name |
129 of the extraction method and and the options dictionary as | |
130 positional arguments, in that order | |
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131 :param strip_comment_tags: a flag that if set to `True` causes all comment |
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132 tags to be removed from the collected comments. |
1 | 133 :return: an iterator over ``(filename, lineno, funcname, message)`` tuples |
134 :rtype: ``iterator`` | |
44 | 135 :see: `pathmatch` |
1 | 136 """ |
44 | 137 if options_map is None: |
138 options_map = {} | |
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139 |
44 | 140 absname = os.path.abspath(dirname) |
141 for root, dirnames, filenames in os.walk(absname): | |
142 for subdir in dirnames: | |
143 if subdir.startswith('.') or subdir.startswith('_'): | |
144 dirnames.remove(subdir) | |
154
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145 dirnames.sort() |
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146 filenames.sort() |
44 | 147 for filename in filenames: |
148 filename = relpath( | |
149 os.path.join(root, filename).replace(os.sep, '/'), | |
150 dirname | |
151 ) | |
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152 for pattern, method in method_map: |
44 | 153 if pathmatch(pattern, filename): |
154 filepath = os.path.join(absname, filename) | |
155 options = {} | |
156 for opattern, odict in options_map.items(): | |
157 if pathmatch(opattern, filename): | |
158 options = odict | |
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159 if callback: |
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160 callback(filename, method, options) |
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161 for lineno, message, comments in \ |
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162 extract_from_file(method, filepath, |
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163 keywords=keywords, |
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164 comment_tags=comment_tags, |
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165 options=options, |
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166 strip_comment_tags= |
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167 strip_comment_tags): |
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168 yield filename, lineno, message, comments |
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169 break |
1 | 170 |
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171 |
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172 def extract_from_file(method, filename, keywords=DEFAULT_KEYWORDS, |
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173 comment_tags=(), options=None, strip_comment_tags=False): |
1 | 174 """Extract messages from a specific file. |
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175 |
1 | 176 This function returns a list of tuples of the form: |
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177 |
1 | 178 ``(lineno, funcname, message)`` |
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179 |
1 | 180 :param filename: the path to the file to extract messages from |
181 :param method: a string specifying the extraction method (.e.g. "python") | |
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182 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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183 that should be recognized as translation functions) to |
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184 tuples that specify which of their arguments contain |
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185 localizable strings |
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186 :param comment_tags: a list of translator tags to search for and include |
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187 in the results |
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188 :param strip_comment_tags: a flag that if set to `True` causes all comment |
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189 tags to be removed from the collected comments. |
1 | 190 :param options: a dictionary of additional options (optional) |
191 :return: the list of extracted messages | |
192 :rtype: `list` | |
193 """ | |
194 fileobj = open(filename, 'U') | |
195 try: | |
338
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196 return list(extract(method, fileobj, keywords, comment_tags, options, |
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197 strip_comment_tags)) |
1 | 198 finally: |
199 fileobj.close() | |
200 | |
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201 |
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202 def extract(method, fileobj, keywords=DEFAULT_KEYWORDS, comment_tags=(), |
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203 options=None, strip_comment_tags=False): |
1 | 204 """Extract messages from the given file-like object using the specified |
205 extraction method. | |
224
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206 |
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207 This function returns tuples of the form: |
224
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208 |
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209 ``(lineno, message, comments)`` |
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210 |
1 | 211 The implementation dispatches the actual extraction to plugins, based on the |
212 value of the ``method`` parameter. | |
224
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213 |
1 | 214 >>> source = '''# foo module |
215 ... def run(argv): | |
216 ... print _('Hello, world!') | |
217 ... ''' | |
224
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218 |
1 | 219 >>> from StringIO import StringIO |
220 >>> for message in extract('python', StringIO(source)): | |
221 ... print message | |
164
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222 (3, u'Hello, world!', []) |
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223 |
250
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224 :param method: a string specifying the extraction method (.e.g. "python"); |
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225 if this is a simple name, the extraction function will be |
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226 looked up by entry point; if it is an explicit reference |
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227 to a function (of the form ``package.module:funcname`` or |
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228 ``package.module.funcname``), the corresponding function |
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229 will be imported and used |
1 | 230 :param fileobj: the file-like object the messages should be extracted from |
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231 :param keywords: a dictionary mapping keywords (i.e. names of functions |
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232 that should be recognized as translation functions) to |
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233 tuples that specify which of their arguments contain |
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234 localizable strings |
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235 :param comment_tags: a list of translator tags to search for and include |
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236 in the results |
1 | 237 :param options: a dictionary of additional options (optional) |
338
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238 :param strip_comment_tags: a flag that if set to `True` causes all comment |
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239 tags to be removed from the collected comments. |
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240 :return: an iterator over ``(lineno, message, comments)`` tuples |
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241 :rtype: `iterator` |
1 | 242 :raise ValueError: if the extraction method is not registered |
243 """ | |
322 | 244 func = None |
329
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245 if ':' in method or '.' in method: |
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246 if ':' not in method: |
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247 lastdot = method.rfind('.') |
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248 module, attrname = method[:lastdot], method[lastdot + 1:] |
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249 else: |
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250 module, attrname = method.split(':', 1) |
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251 func = getattr(__import__(module, {}, {}, [attrname]), attrname) |
250
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252 else: |
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253 try: |
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254 from pkg_resources import working_set |
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255 except ImportError: |
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256 # pkg_resources is not available, so we resort to looking up the |
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257 # builtin extractors directly |
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258 builtin = {'ignore': extract_nothing, 'python': extract_python} |
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259 func = builtin.get(method) |
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260 else: |
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261 for entry_point in working_set.iter_entry_points(GROUP_NAME, |
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262 method): |
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263 func = entry_point.load(require=True) |
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264 break |
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265 if func is None: |
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266 raise ValueError('Unknown extraction method %r' % method) |
222 | 267 |
250
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268 results = func(fileobj, keywords.keys(), comment_tags, |
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269 options=options or {}) |
366
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270 |
250
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271 for lineno, funcname, messages, comments in results: |
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272 if funcname: |
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273 spec = keywords[funcname] or (1,) |
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274 else: |
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275 spec = (1,) |
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276 if not isinstance(messages, (list, tuple)): |
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277 messages = [messages] |
258
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278 if not messages: |
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279 continue |
222 | 280 |
258
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281 # Validate the messages against the keyword's specification |
250
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282 msgs = [] |
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283 invalid = False |
258
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284 # last_index is 1 based like the keyword spec |
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285 last_index = len(messages) |
250
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286 for index in spec: |
258
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287 if last_index < index: |
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288 # Not enough arguments |
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289 invalid = True |
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290 break |
250
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291 message = messages[index - 1] |
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292 if message is None: |
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293 invalid = True |
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294 break |
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295 msgs.append(message) |
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296 if invalid: |
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297 continue |
222 | 298 |
250
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299 first_msg_index = spec[0] - 1 |
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300 if not messages[first_msg_index]: |
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301 # An empty string msgid isn't valid, emit a warning |
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302 where = '%s:%i' % (hasattr(fileobj, 'name') and \ |
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303 fileobj.name or '(unknown)', lineno) |
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304 print >> sys.stderr, empty_msgid_warning % where |
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305 continue |
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306 |
250
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307 messages = tuple(msgs) |
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308 if len(messages) == 1: |
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309 messages = messages[0] |
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310 |
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311 if strip_comment_tags: |
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312 _strip_comment_tags(comments, comment_tags) |
250
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313 yield lineno, messages, comments |
1 | 314 |
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315 |
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316 def extract_nothing(fileobj, keywords, comment_tags, options): |
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317 """Pseudo extractor that does not actually extract anything, but simply |
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318 returns an empty list. |
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319 """ |
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320 return [] |
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321 |
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322 |
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323 def extract_python(fileobj, keywords, comment_tags, options): |
1 | 324 """Extract messages from Python source code. |
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325 |
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326 :param fileobj: the seekable, file-like object the messages should be |
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327 extracted from |
1 | 328 :param keywords: a list of keywords (i.e. function names) that should be |
329 recognized as translation functions | |
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330 :param comment_tags: a list of translator tags to search for and include |
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331 in the results |
1 | 332 :param options: a dictionary of additional options (optional) |
81
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333 :return: an iterator over ``(lineno, funcname, message, comments)`` tuples |
1 | 334 :rtype: ``iterator`` |
335 """ | |
222 | 336 funcname = lineno = message_lineno = None |
337 call_stack = -1 | |
1 | 338 buf = [] |
339 messages = [] | |
80
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340 translator_comments = [] |
222 | 341 in_def = in_translator_comments = False |
338
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342 comment_tag = None |
1 | 343 |
222 | 344 encoding = parse_encoding(fileobj) or options.get('encoding', 'iso-8859-1') |
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345 |
1 | 346 tokens = generate_tokens(fileobj.readline) |
347 for tok, value, (lineno, _), _, _ in tokens: | |
222 | 348 if call_stack == -1 and tok == NAME and value in ('def', 'class'): |
349 in_def = True | |
350 elif tok == OP and value == '(': | |
351 if in_def: | |
352 # Avoid false positives for declarations such as: | |
353 # def gettext(arg='message'): | |
354 in_def = False | |
355 continue | |
356 if funcname: | |
357 message_lineno = lineno | |
358 call_stack += 1 | |
223 | 359 elif in_def and tok == OP and value == ':': |
360 # End of a class definition without parens | |
361 in_def = False | |
362 continue | |
222 | 363 elif call_stack == -1 and tok == COMMENT: |
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364 # Strip the comment token from the line |
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365 value = value.decode(encoding)[1:].strip() |
147 | 366 if in_translator_comments and \ |
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367 translator_comments[-1][0] == lineno - 1: |
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368 # We're already inside a translator comment, continue appending |
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369 translator_comments.append((lineno, value)) |
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370 continue |
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371 # If execution reaches this point, let's see if comment line |
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372 # starts with one of the comment tags |
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373 for comment_tag in comment_tags: |
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374 if value.startswith(comment_tag): |
147 | 375 in_translator_comments = True |
338
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376 translator_comments.append((lineno, value)) |
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377 break |
222 | 378 elif funcname and call_stack == 0: |
1 | 379 if tok == OP and value == ')': |
380 if buf: | |
381 messages.append(''.join(buf)) | |
382 del buf[:] | |
222 | 383 else: |
384 messages.append(None) | |
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385 |
222 | 386 if len(messages) > 1: |
387 messages = tuple(messages) | |
388 else: | |
389 messages = messages[0] | |
390 # Comments don't apply unless they immediately preceed the | |
391 # message | |
392 if translator_comments and \ | |
393 translator_comments[-1][0] < message_lineno - 1: | |
394 translator_comments = [] | |
395 | |
396 yield (message_lineno, funcname, messages, | |
397 [comment[1] for comment in translator_comments]) | |
398 | |
399 funcname = lineno = message_lineno = None | |
400 call_stack = -1 | |
1 | 401 messages = [] |
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402 translator_comments = [] |
222 | 403 in_translator_comments = False |
1 | 404 elif tok == STRING: |
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405 # Unwrap quotes in a safe manner, maintaining the string's |
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406 # encoding |
222 | 407 # https://sourceforge.net/tracker/?func=detail&atid=355470& |
408 # aid=617979&group_id=5470 | |
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409 value = eval('# coding=%s\n%s' % (encoding, value), |
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410 {'__builtins__':{}}, {}) |
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411 if isinstance(value, str): |
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412 value = value.decode(encoding) |
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413 buf.append(value) |
1 | 414 elif tok == OP and value == ',': |
222 | 415 if buf: |
416 messages.append(''.join(buf)) | |
417 del buf[:] | |
418 else: | |
419 messages.append(None) | |
366
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420 if translator_comments: |
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421 # We have translator comments, and since we're on a |
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422 # comma(,) user is allowed to break into a new line |
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423 # Let's increase the last comment's lineno in order |
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424 # for the comment to still be a valid one |
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425 old_lineno, old_comment = translator_comments.pop() |
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426 translator_comments.append((old_lineno+1, old_comment)) |
222 | 427 elif call_stack > 0 and tok == OP and value == ')': |
428 call_stack -= 1 | |
429 elif funcname and call_stack == -1: | |
1 | 430 funcname = None |
431 elif tok == NAME and value in keywords: | |
432 funcname = value | |
339 | 433 |
340
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434 |
339 | 435 def extract_javascript(fileobj, keywords, comment_tags, options): |
436 """Extract messages from JavaScript source code. | |
437 | |
438 :param fileobj: the seekable, file-like object the messages should be | |
439 extracted from | |
440 :param keywords: a list of keywords (i.e. function names) that should be | |
441 recognized as translation functions | |
442 :param comment_tags: a list of translator tags to search for and include | |
443 in the results | |
444 :param options: a dictionary of additional options (optional) | |
445 :return: an iterator over ``(lineno, funcname, message, comments)`` tuples | |
446 :rtype: ``iterator`` | |
447 """ | |
448 from babel.messages.jslexer import tokenize, unquote_string | |
449 funcname = message_lineno = None | |
450 messages = [] | |
451 last_argument = None | |
452 translator_comments = [] | |
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453 concatenate_next = False |
339 | 454 encoding = options.get('encoding', 'utf-8') |
455 last_token = None | |
456 call_stack = -1 | |
457 | |
458 for token in tokenize(fileobj.read().decode(encoding)): | |
459 if token.type == 'operator' and token.value == '(': | |
460 if funcname: | |
461 message_lineno = token.lineno | |
462 call_stack += 1 | |
463 | |
464 elif call_stack == -1 and token.type == 'linecomment': | |
465 value = token.value[2:].strip() | |
466 if translator_comments and \ | |
467 translator_comments[-1][0] == token.lineno - 1: | |
468 translator_comments.append((token.lineno, value)) | |
469 continue | |
470 | |
471 for comment_tag in comment_tags: | |
472 if value.startswith(comment_tag): | |
473 translator_comments.append((token.lineno, value.strip())) | |
474 break | |
475 | |
476 elif token.type == 'multilinecomment': | |
477 # only one multi-line comment may preceed a translation | |
478 translator_comments = [] | |
479 value = token.value[2:-2].strip() | |
480 for comment_tag in comment_tags: | |
481 if value.startswith(comment_tag): | |
482 lines = value.splitlines() | |
483 if lines: | |
484 lines[0] = lines[0].strip() | |
485 lines[1:] = dedent('\n'.join(lines[1:])).splitlines() | |
486 for offset, line in enumerate(lines): | |
487 translator_comments.append((token.lineno + offset, | |
488 line)) | |
489 break | |
490 | |
491 elif funcname and call_stack == 0: | |
492 if token.type == 'operator' and token.value == ')': | |
493 if last_argument is not None: | |
494 messages.append(last_argument) | |
495 if len(messages) > 1: | |
496 messages = tuple(messages) | |
497 elif messages: | |
498 messages = messages[0] | |
499 else: | |
500 messages = None | |
501 | |
426 | 502 # Comments don't apply unless they immediately precede the |
339 | 503 # message |
504 if translator_comments and \ | |
505 translator_comments[-1][0] < message_lineno - 1: | |
506 translator_comments = [] | |
507 | |
508 if messages is not None: | |
509 yield (message_lineno, funcname, messages, | |
510 [comment[1] for comment in translator_comments]) | |
511 | |
512 funcname = message_lineno = last_argument = None | |
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513 concatenate_next = False |
339 | 514 translator_comments = [] |
515 messages = [] | |
516 call_stack = -1 | |
517 | |
518 elif token.type == 'string': | |
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519 new_value = unquote_string(token.value) |
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520 if concatenate_next: |
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521 last_argument = (last_argument or '') + new_value |
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522 concatenate_next = False |
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523 else: |
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524 last_argument = new_value |
339 | 525 |
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526 elif token.type == 'operator': |
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527 if token.value == ',': |
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528 if last_argument is not None: |
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529 messages.append(last_argument) |
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530 last_argument = None |
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531 else: |
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532 messages.append(None) |
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533 concatenate_next = False |
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534 elif token.value == '+': |
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535 concatenate_next = True |
339 | 536 |
537 elif call_stack > 0 and token.type == 'operator' \ | |
538 and token.value == ')': | |
539 call_stack -= 1 | |
540 | |
541 elif funcname and call_stack == -1: | |
542 funcname = None | |
543 | |
544 elif call_stack == -1 and token.type == 'name' and \ | |
545 token.value in keywords and \ | |
546 (last_token is None or last_token.type != 'name' or | |
547 last_token.value != 'function'): | |
548 funcname = token.value | |
549 | |
550 last_token = token |