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1 """ | |
2 Meta Data Extension for Python-Markdown | |
3 ======================================= | |
4 | |
5 This extension adds Meta Data handling to markdown. | |
6 | |
7 See <https://pythonhosted.org/Markdown/extensions/meta_data.html> | |
8 for documentation. | |
9 | |
10 Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com). | |
11 | |
12 All changes Copyright 2008-2014 The Python Markdown Project | |
13 | |
14 License: [BSD](http://www.opensource.org/licenses/bsd-license.php) | |
15 | |
16 """ | |
17 | |
18 from __future__ import absolute_import | |
19 from __future__ import unicode_literals | |
20 from . import Extension | |
21 from ..preprocessors import Preprocessor | |
22 import re | |
23 import logging | |
24 | |
25 log = logging.getLogger('MARKDOWN') | |
26 | |
27 # Global Vars | |
28 META_RE = re.compile(r'^[ ]{0,3}(?P<key>[A-Za-z0-9_-]+):\s*(?P<value>.*)') | |
29 META_MORE_RE = re.compile(r'^[ ]{4,}(?P<value>.*)') | |
30 BEGIN_RE = re.compile(r'^-{3}(\s.*)?') | |
31 END_RE = re.compile(r'^(-{3}|\.{3})(\s.*)?') | |
32 | |
33 | |
34 class MetaExtension (Extension): | |
35 """ Meta-Data extension for Python-Markdown. """ | |
36 | |
37 def extendMarkdown(self, md, md_globals): | |
38 """ Add MetaPreprocessor to Markdown instance. """ | |
39 md.preprocessors.add("meta", | |
40 MetaPreprocessor(md), | |
41 ">normalize_whitespace") | |
42 | |
43 | |
44 class MetaPreprocessor(Preprocessor): | |
45 """ Get Meta-Data. """ | |
46 | |
47 def run(self, lines): | |
48 """ Parse Meta-Data and store in Markdown.Meta. """ | |
49 meta = {} | |
50 key = None | |
51 if lines and BEGIN_RE.match(lines[0]): | |
52 lines.pop(0) | |
53 while lines: | |
54 line = lines.pop(0) | |
55 m1 = META_RE.match(line) | |
56 if line.strip() == '' or END_RE.match(line): | |
57 break # blank line or end of YAML header - done | |
58 if m1: | |
59 key = m1.group('key').lower().strip() | |
60 value = m1.group('value').strip() | |
61 try: | |
62 meta[key].append(value) | |
63 except KeyError: | |
64 meta[key] = [value] | |
65 else: | |
66 m2 = META_MORE_RE.match(line) | |
67 if m2 and key: | |
68 # Add another line to existing key | |
69 meta[key].append(m2.group('value').strip()) | |
70 else: | |
71 lines.insert(0, line) | |
72 break # no meta data - done | |
73 self.markdown.Meta = meta | |
74 return lines | |
75 | |
76 | |
77 def makeExtension(*args, **kwargs): | |
78 return MetaExtension(*args, **kwargs) | |
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