Support markdown template for html editor

third_party/markdown/extensions/meta.py

+"""
+Meta Data Extension for Python-Markdown
+=======================================
+
+This extension adds Meta Data handling to markdown.
+
+Basic Usage:
+
+    >>> import markdown
+    >>> text = '''Title: A Test Doc.
+    ... Author: Waylan Limberg
+    ...         John Doe
+    ... Blank_Data:
+    ...
+    ... The body. This is paragraph one.
+    ... '''
+    >>> md = markdown.Markdown(['meta'])
+    >>> print md.convert(text)
+    <p>The body. This is paragraph one.</p>
+    >>> print md.Meta
+    {u'blank_data': [u''], u'author': [u'Waylan Limberg', u'John Doe'], u'title': [u'A Test Doc.']}
+
+Make sure text without Meta Data still works (markdown < 1.6b returns a <p>).
+
+    >>> text = '    Some Code - not extra lines of meta data.'
+    >>> md = markdown.Markdown(['meta'])
+    >>> print md.convert(text)
+    <pre><code>Some Code - not extra lines of meta data.
+    </code></pre>
+    >>> md.Meta
+    {}
+
+Copyright 2007-2008 [Waylan Limberg](http://achinghead.com).
+
+Project website: <http://packages.python.org/Markdown/meta_data.html>
+Contact: markdown@freewisdom.org
+
+License: BSD (see ../LICENSE.md for details)
+
+"""
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+from . import Extension
+from ..preprocessors import Preprocessor
+import re
+
+# 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>.*)')
+
+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), "_begin")
+
+
+class MetaPreprocessor(Preprocessor):
+    """ Get Meta-Data. """
+
+    def run(self, lines):
+        """ Parse Meta-Data and store in Markdown.Meta. """
+        meta = {}
+        key = None
+        while 1:
+            line = lines.pop(0)
+            if line.strip() == '':
+                break # blank line - done
+            m1 = META_RE.match(line)
+            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(configs={}):
+    return MetaExtension(configs=configs)