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110 lines
3.8 KiB
110 lines
3.8 KiB
4 years ago
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"""
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Fenced Code Extension for Python Markdown
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=========================================
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This extension adds Fenced Code Blocks to Python-Markdown.
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See <https://Python-Markdown.github.io/extensions/fenced_code_blocks>
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for documentation.
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Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/).
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All changes Copyright 2008-2014 The Python Markdown Project
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License: [BSD](https://opensource.org/licenses/bsd-license.php)
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"""
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from . import Extension
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from ..preprocessors import Preprocessor
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from .codehilite import CodeHilite, CodeHiliteExtension, parse_hl_lines
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import re
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class FencedCodeExtension(Extension):
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def extendMarkdown(self, md):
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""" Add FencedBlockPreprocessor to the Markdown instance. """
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md.registerExtension(self)
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md.preprocessors.register(FencedBlockPreprocessor(md), 'fenced_code_block', 25)
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class FencedBlockPreprocessor(Preprocessor):
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FENCED_BLOCK_RE = re.compile(r'''
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(?P<fence>^(?:~{3,}|`{3,}))[ ]* # Opening ``` or ~~~
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(\{?\.?(?P<lang>[\w#.+-]*))?[ ]* # Optional {, and lang
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# Optional highlight lines, single- or double-quote-delimited
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(hl_lines=(?P<quot>"|')(?P<hl_lines>.*?)(?P=quot))?[ ]*
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}?[ ]*\n # Optional closing }
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(?P<code>.*?)(?<=\n)
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(?P=fence)[ ]*$''', re.MULTILINE | re.DOTALL | re.VERBOSE)
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CODE_WRAP = '<pre><code%s>%s</code></pre>'
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LANG_TAG = ' class="%s"'
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def __init__(self, md):
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super().__init__(md)
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self.checked_for_codehilite = False
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self.codehilite_conf = {}
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def run(self, lines):
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""" Match and store Fenced Code Blocks in the HtmlStash. """
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# Check for code hilite extension
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if not self.checked_for_codehilite:
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for ext in self.md.registeredExtensions:
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if isinstance(ext, CodeHiliteExtension):
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self.codehilite_conf = ext.config
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break
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self.checked_for_codehilite = True
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text = "\n".join(lines)
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while 1:
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m = self.FENCED_BLOCK_RE.search(text)
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if m:
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lang = ''
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if m.group('lang'):
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lang = self.LANG_TAG % m.group('lang')
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# If config is not empty, then the codehighlite extension
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# is enabled, so we call it to highlight the code
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if self.codehilite_conf:
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highliter = CodeHilite(
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m.group('code'),
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linenums=self.codehilite_conf['linenums'][0],
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guess_lang=self.codehilite_conf['guess_lang'][0],
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css_class=self.codehilite_conf['css_class'][0],
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style=self.codehilite_conf['pygments_style'][0],
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use_pygments=self.codehilite_conf['use_pygments'][0],
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lang=(m.group('lang') or None),
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noclasses=self.codehilite_conf['noclasses'][0],
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hl_lines=parse_hl_lines(m.group('hl_lines'))
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)
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code = highliter.hilite()
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else:
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code = self.CODE_WRAP % (lang,
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self._escape(m.group('code')))
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placeholder = self.md.htmlStash.store(code)
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text = '{}\n{}\n{}'.format(text[:m.start()],
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placeholder,
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text[m.end():])
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else:
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break
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return text.split("\n")
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def _escape(self, txt):
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""" basic html escaping """
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txt = txt.replace('&', '&')
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txt = txt.replace('<', '<')
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txt = txt.replace('>', '>')
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txt = txt.replace('"', '"')
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return txt
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def makeExtension(**kwargs): # pragma: no cover
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return FencedCodeExtension(**kwargs)
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