wikilinks.py
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'''
WikiLinks Extension for Python-Markdown
======================================
Converts [[WikiLinks]] to relative links.
See <https://Python-Markdown.github.io/extensions/wikilinks>
for documentation.
Original code Copyright [Waylan Limberg](http://achinghead.com/).
All changes Copyright The Python Markdown Project
License: [BSD](https://opensource.org/licenses/bsd-license.php)
'''
from . import Extension
from ..inlinepatterns import InlineProcessor
import xml.etree.ElementTree as 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 '{}{}{}'.format(base, clean_label, end)
class WikiLinkExtension(Extension):
def __init__(self, **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().__init__(**kwargs)
def extendMarkdown(self, md):
self.md = md
# append to end of inline patterns
WIKILINK_RE = r'\[\[([\w0-9_ -]+)\]\]'
wikilinkPattern = WikiLinksInlineProcessor(WIKILINK_RE, self.getConfigs())
wikilinkPattern.md = md
md.inlinePatterns.register(wikilinkPattern, 'wikilink', 75)
class WikiLinksInlineProcessor(InlineProcessor):
def __init__(self, pattern, config):
super().__init__(pattern)
self.config = config
def handleMatch(self, m, data):
if m.group(1).strip():
base_url, end_url, html_class = self._getMeta()
label = m.group(1).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, m.start(0), m.end(0)
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(**kwargs): # pragma: no cover
return WikiLinkExtension(**kwargs)