root/galaxy-central/eggs/Mako-0.2.5-py2.6.egg/mako/ext/babelplugin.py

リビジョン 3, 4.8 KB (コミッタ: kohda, 14 年 前)

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1"""gettext message extraction via Babel: http://babel.edgewall.org/"""
2from StringIO import StringIO
3
4from babel.messages.extract import extract_python
5
6from mako import lexer, parsetree
7
8def extract(fileobj, keywords, comment_tags, options):
9    """Extract messages from Mako templates.
10
11    :param fileobj: the file-like object the messages should be extracted from
12    :param keywords: a list of keywords (i.e. function names) that should be
13                     recognized as translation functions
14    :param comment_tags: a list of translator tags to search for and include
15                         in the results
16    :param options: a dictionary of additional options (optional)
17    :return: an iterator over ``(lineno, funcname, message, comments)`` tuples
18    :rtype: ``iterator``
19    """
20    encoding = options.get('input_encoding', options.get('encoding', None))
21
22    template_node = lexer.Lexer(fileobj.read(),
23                                input_encoding=encoding).parse()
24    for extracted in extract_nodes(template_node.get_children(),
25                                   keywords, comment_tags, options):
26        yield extracted
27
28def extract_nodes(nodes, keywords, comment_tags, options):
29    """Extract messages from Mako's lexer node objects
30
31    :param nodes: an iterable of Mako parsetree.Node objects to extract from
32    :param keywords: a list of keywords (i.e. function names) that should be
33                     recognized as translation functions
34    :param comment_tags: a list of translator tags to search for and include
35                         in the results
36    :param options: a dictionary of additional options (optional)
37    :return: an iterator over ``(lineno, funcname, message, comments)`` tuples
38    :rtype: ``iterator``
39    """
40    translator_comments = []
41    in_translator_comments = False
42
43    for node in nodes:
44        child_nodes = None
45        if in_translator_comments and isinstance(node, parsetree.Text) and \
46                not node.content.strip():
47            # Ignore whitespace within translator comments
48            continue
49
50        if isinstance(node, parsetree.Comment):
51            value = node.text.strip()
52            if in_translator_comments:
53                translator_comments.extend(_split_comment(node.lineno, value))
54                continue
55            for comment_tag in comment_tags:
56                if value.startswith(comment_tag):
57                    in_translator_comments = True
58                    translator_comments.extend(_split_comment(node.lineno,
59                                                              value))
60            continue
61
62        if isinstance(node, parsetree.DefTag):
63            code = node.function_decl.code
64            child_nodes = node.nodes
65        elif isinstance(node, parsetree.CallTag):
66            code = node.code.code
67            child_nodes = node.nodes
68        elif isinstance(node, parsetree.PageTag):
69            code = node.body_decl.code
70        elif isinstance(node, parsetree.ControlLine):
71            if node.isend:
72                translator_comments = []
73                in_translator_comments = False
74                continue
75            code = node.text
76        elif isinstance(node, parsetree.Code):
77            # <% and <%! blocks would provide their own translator comments
78            translator_comments = []
79            in_translator_comments = False
80
81            code = node.code.code
82        elif isinstance(node, parsetree.Expression):
83            code = node.code.code
84        else:
85            translator_comments = []
86            in_translator_comments = False
87            continue
88
89        # Comments don't apply unless they immediately preceed the message
90        if translator_comments and \
91                translator_comments[-1][0] < node.lineno - 1:
92            translator_comments = []
93        else:
94            translator_comments = \
95                [comment[1] for comment in translator_comments]
96
97        if isinstance(code, unicode):
98            code = code.encode('ascii', 'backslashreplace')
99        code = StringIO(code)
100        for lineno, funcname, messages, python_translator_comments \
101                in extract_python(code, keywords, comment_tags, options):
102            yield (node.lineno + (lineno - 1), funcname, messages,
103                   translator_comments + python_translator_comments)
104
105        translator_comments = []
106        in_translator_comments = False
107
108        if child_nodes:
109            for extracted in extract_nodes(child_nodes, keywords, comment_tags,
110                                           options):
111                yield extracted
112
113
114def _split_comment(lineno, comment):
115    """Return the multiline comment at lineno split into a list of comment line
116    numbers and the accompanying comment line"""
117    return [(lineno + index, line) for index, line in
118            enumerate(comment.splitlines())]
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