Revert of Check in a simple pure-python based Markdown previewer.

third_party/Python-Markdown/markdown/extensions/wikilinks.py

-'''
-WikiLinks Extension for Python-Markdown
-======================================
-
-Converts [[WikiLinks]] to relative links.
-
-See <https://pythonhosted.org/Markdown/extensions/wikilinks.html>
-for documentation.
-
-Original code Copyright [Waylan Limberg](http://achinghead.com/).
-
-All changes Copyright 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 ..inlinepatterns import Pattern
-from ..util import etree
-import re
-
-
-def build_url(label, base, end):
-    """ Build a url from the label, a base, and an end. """
-    clean_label = re.sub(r'([ ]+_)|(_[ ]+)|([ ]+)', '_', label)
-    return '%s%s%s' % (base, clean_label, end)
-
-
-class WikiLinkExtension(Extension):
-
-    def __init__(self, *args, **kwargs):
-        self.config = {
-            'base_url': ['/', 'String to append to beginning or URL.'],
-            'end_url': ['/', 'String to append to end of URL.'],
-            'html_class': ['wikilink', 'CSS hook. Leave blank for none.'],
-            'build_url': [build_url, 'Callable formats URL from label.'],
-        }
-
-        super(WikiLinkExtension, self).__init__(*args, **kwargs)
-
-    def extendMarkdown(self, md, md_globals):
-        self.md = md
-
-        # append to end of inline patterns
-        WIKILINK_RE = r'\[\[([\w0-9_ -]+)\]\]'
-        wikilinkPattern = WikiLinks(WIKILINK_RE, self.getConfigs())
-        wikilinkPattern.md = md
-        md.inlinePatterns.add('wikilink', wikilinkPattern, "<not_strong")
-
-
-class WikiLinks(Pattern):
-    def __init__(self, pattern, config):
-        super(WikiLinks, self).__init__(pattern)
-        self.config = config
-
-    def handleMatch(self, m):
-        if m.group(2).strip():
-            base_url, end_url, html_class = self._getMeta()
-            label = m.group(2).strip()
-            url = self.config['build_url'](label, base_url, end_url)
-            a = etree.Element('a')
-            a.text = label
-            a.set('href', url)
-            if html_class:
-                a.set('class', html_class)
-        else:
-            a = ''
-        return a
-
-    def _getMeta(self):
-        """ Return meta data or config data. """
-        base_url = self.config['base_url']
-        end_url = self.config['end_url']
-        html_class = self.config['html_class']
-        if hasattr(self.md, 'Meta'):
-            if 'wiki_base_url' in self.md.Meta:
-                base_url = self.md.Meta['wiki_base_url'][0]
-            if 'wiki_end_url' in self.md.Meta:
-                end_url = self.md.Meta['wiki_end_url'][0]
-            if 'wiki_html_class' in self.md.Meta:
-                html_class = self.md.Meta['wiki_html_class'][0]
-        return base_url, end_url, html_class
-
-
-def makeExtension(*args, **kwargs):
-    return WikiLinkExtension(*args, **kwargs)