| """ |
| Meta Data Extension for Python-Markdown |
| ======================================= |
| |
| This extension adds Meta Data handling to markdown. |
| |
| See <https://pythonhosted.org/Markdown/extensions/meta_data.html> |
| for documentation. |
| |
| Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com). |
| |
| All changes Copyright 2008-2014 The Python Markdown Project |
| |
| License: [BSD](http://www.opensource.org/licenses/bsd-license.php) |
| |
| """ |
| |
| from __future__ import absolute_import |
| from __future__ import unicode_literals |
| 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, md_globals): |
| """ Add MetaPreprocessor to Markdown instance. """ |
| md.preprocessors.add("meta", |
| MetaPreprocessor(md), |
| ">normalize_whitespace") |
| |
| |
| 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.markdown.Meta = meta |
| return lines |
| |
| |
| def makeExtension(*args, **kwargs): |
| return MetaExtension(*args, **kwargs) |