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# -*- coding: utf-8 -*-
# Copyright © 2012-2018 Roberto Alsina and others.
# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""Markdown Extension for Nikola.
- Specific post-processing.
- Strikethrough inline patterns.
"""
import re
try:
from markdown.postprocessors import Postprocessor
from markdown.inlinepatterns import SimpleTagPattern
from markdown.extensions import Extension
except ImportError:
# No need to catch this, if you try to use this without Markdown,
# the markdown compiler will fail first
Postprocessor = SimpleTagPattern = Extension = object
from nikola.plugin_categories import MarkdownExtension
CODERE = re.compile('<div class="codehilite"><pre>(.*?)</pre></div>', flags=re.MULTILINE | re.DOTALL)
STRIKE_RE = r"(~{2})(.+?)(~{2})" # ~~strike~~
class NikolaPostProcessor(Postprocessor):
"""Nikola-specific post-processing for Markdown."""
def run(self, text):
"""Run the postprocessor."""
output = text
# python-markdown's highlighter uses <div class="codehilite"><pre>
# for code. We switch it to reST's <pre class="code">.
# TODO: monkey-patch for CodeHilite that uses nikola.utils.NikolaPygmentsHTML
output = CODERE.sub('<pre class="code literal-block">\\1</pre>', output)
return output
class NikolaExtension(MarkdownExtension, Extension):
"""Nikola Markdown extensions."""
def _add_nikola_post_processor(self, md):
"""Extend Markdown with the postprocessor."""
pp = NikolaPostProcessor()
md.postprocessors.add('nikola_post_processor', pp, '_end')
def _add_strikethrough_inline_pattern(self, md):
"""Support PHP-Markdown style strikethrough, for example: ``~~strike~~``."""
pattern = SimpleTagPattern(STRIKE_RE, 'del')
md.inlinePatterns.add('strikethrough', pattern, '_end')
def extendMarkdown(self, md, md_globals):
"""Extend markdown to Nikola flavours."""
self._add_nikola_post_processor(md)
self._add_strikethrough_inline_pattern(md)
md.registerExtension(self)
def makeExtension(configs=None): # pragma: no cover
"""Make extension."""
return NikolaExtension(configs)