Revert 243980 "Docserver: Support markdown for HTML content."

trunk/src/third_party/markdown/extensions/wikilinks.py

-'''
-WikiLinks Extension for Python-Markdown
-======================================
-
-Converts [[WikiLinks]] to relative links.  Requires Python-Markdown 2.0+
-
-Basic usage:
-
-    >>> import markdown
-    >>> text = "Some text with a [[WikiLink]]."
-    >>> html = markdown.markdown(text, ['wikilinks'])
-    >>> print html
-    <p>Some text with a <a class="wikilink" href="/WikiLink/">WikiLink</a>.</p>
-
-Whitespace behavior:
-
-    >>> print markdown.markdown('[[ foo bar_baz ]]', ['wikilinks'])
-    <p><a class="wikilink" href="/foo_bar_baz/">foo bar_baz</a></p>
-    >>> print markdown.markdown('foo [[ ]] bar', ['wikilinks'])
-    <p>foo  bar</p>
-
-To define custom settings the simple way:
-
-    >>> print markdown.markdown(text, 
-    ...     ['wikilinks(base_url=/wiki/,end_url=.html,html_class=foo)']
-    ... )
-    <p>Some text with a <a class="foo" href="/wiki/WikiLink.html">WikiLink</a>.</p>
-    
-Custom settings the complex way:
-
-    >>> md = markdown.Markdown(
-    ...     extensions = ['wikilinks'], 
-    ...     extension_configs = {'wikilinks': [
-    ...                                 ('base_url', 'http://example.com/'), 
-    ...                                 ('end_url', '.html'),
-    ...                                 ('html_class', '') ]},
-    ...     safe_mode = True)
-    >>> print md.convert(text)
-    <p>Some text with a <a href="http://example.com/WikiLink.html">WikiLink</a>.</p>
-
-Use MetaData with mdx_meta.py (Note the blank html_class in MetaData):
-
-    >>> text = """wiki_base_url: http://example.com/
-    ... wiki_end_url:   .html
-    ... wiki_html_class:
-    ...
-    ... Some text with a [[WikiLink]]."""
-    >>> md = markdown.Markdown(extensions=['meta', 'wikilinks'])
-    >>> print md.convert(text)
-    <p>Some text with a <a href="http://example.com/WikiLink.html">WikiLink</a>.</p>
-
-MetaData should not carry over to next document:
-
-    >>> print md.convert("No [[MetaData]] here.")
-    <p>No <a class="wikilink" href="/MetaData/">MetaData</a> here.</p>
-
-Define a custom URL builder:
-
-    >>> def my_url_builder(label, base, end):
-    ...     return '/bar/'
-    >>> md = markdown.Markdown(extensions=['wikilinks'], 
-    ...         extension_configs={'wikilinks' : [('build_url', my_url_builder)]})
-    >>> print md.convert('[[foo]]')
-    <p><a class="wikilink" href="/bar/">foo</a></p>
-
-From the command line:
-
-    python markdown.py -x wikilinks(base_url=http://example.com/,end_url=.html,html_class=foo) src.txt
-
-By [Waylan Limberg](http://achinghead.com/).
-
-License: [BSD](http://www.opensource.org/licenses/bsd-license.php) 
-
-Dependencies:
-* [Python 2.3+](http://python.org)
-* [Markdown 2.0+](http://packages.python.org/Markdown/)
-'''
-
-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, configs):
-        # set extension defaults
-        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.'],
-        }
-        
-        # Override defaults with user settings
-        for key, value in configs :
-            self.setConfig(key, value)
-        
-    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(configs=None) :
-    return WikiLinkExtension(configs=configs)