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79 lines
2.3 KiB
79 lines
2.3 KiB
""" |
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Meta Data Extension for Python-Markdown |
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======================================= |
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This extension adds Meta Data handling to markdown. |
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See <https://Python-Markdown.github.io/extensions/meta_data> |
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for documentation. |
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Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com). |
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All changes Copyright 2008-2014 The Python Markdown Project |
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License: [BSD](https://opensource.org/licenses/bsd-license.php) |
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""" |
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from . import Extension |
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from ..preprocessors import Preprocessor |
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import re |
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import logging |
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log = logging.getLogger('MARKDOWN') |
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# Global Vars |
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META_RE = re.compile(r'^[ ]{0,3}(?P<key>[A-Za-z0-9_-]+):\s*(?P<value>.*)') |
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META_MORE_RE = re.compile(r'^[ ]{4,}(?P<value>.*)') |
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BEGIN_RE = re.compile(r'^-{3}(\s.*)?') |
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END_RE = re.compile(r'^(-{3}|\.{3})(\s.*)?') |
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class MetaExtension (Extension): |
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""" Meta-Data extension for Python-Markdown. """ |
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def extendMarkdown(self, md): |
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""" Add `MetaPreprocessor` to Markdown instance. """ |
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md.registerExtension(self) |
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self.md = md |
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md.preprocessors.register(MetaPreprocessor(md), 'meta', 27) |
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def reset(self): |
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self.md.Meta = {} |
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class MetaPreprocessor(Preprocessor): |
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""" Get Meta-Data. """ |
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def run(self, lines): |
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""" Parse Meta-Data and store in Markdown.Meta. """ |
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meta = {} |
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key = None |
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if lines and BEGIN_RE.match(lines[0]): |
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lines.pop(0) |
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while lines: |
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line = lines.pop(0) |
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m1 = META_RE.match(line) |
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if line.strip() == '' or END_RE.match(line): |
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break # blank line or end of YAML header - done |
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if m1: |
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key = m1.group('key').lower().strip() |
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value = m1.group('value').strip() |
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try: |
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meta[key].append(value) |
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except KeyError: |
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meta[key] = [value] |
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else: |
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m2 = META_MORE_RE.match(line) |
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if m2 and key: |
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# Add another line to existing key |
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meta[key].append(m2.group('value').strip()) |
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else: |
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lines.insert(0, line) |
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break # no meta data - done |
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self.md.Meta = meta |
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return lines |
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def makeExtension(**kwargs): # pragma: no cover |
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return MetaExtension(**kwargs)
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