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80 lines
2.3 KiB
80 lines
2.3 KiB
4 years ago
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"""
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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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