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