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118 lines
3.4 KiB
Python
118 lines
3.4 KiB
Python
#!/usr/bin/env python
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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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>>> import markdown
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>>> text = '''
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... A paragraph before a fenced code block:
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...
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... ~~~
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... Fenced code block
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... ~~~
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... '''
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>>> html = markdown.markdown(text, extensions=['fenced_code'])
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>>> html
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u'<p>A paragraph before a fenced code block:</p>\\n<pre><code>Fenced code block\\n</code></pre>'
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Works with safe_mode also (we check this because we are using the HtmlStash):
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>>> markdown.markdown(text, extensions=['fenced_code'], safe_mode='replace')
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u'<p>A paragraph before a fenced code block:</p>\\n<pre><code>Fenced code block\\n</code></pre>'
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Include tilde's in a code block and wrap with blank lines:
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>>> text = '''
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... ~~~~~~~~
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...
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... ~~~~
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...
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... ~~~~~~~~'''
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>>> markdown.markdown(text, extensions=['fenced_code'])
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u'<pre><code>\\n~~~~\\n\\n</code></pre>'
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Multiple blocks and language tags:
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>>> text = '''
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... ~~~~{.python}
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... block one
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... ~~~~
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...
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... ~~~~.html
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... <p>block two</p>
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... ~~~~'''
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>>> markdown.markdown(text, extensions=['fenced_code'])
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u'<pre><code class="python">block one\\n</code></pre>\\n\\n<pre><code class="html"><p>block two</p>\\n</code></pre>'
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Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/).
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Project website: <http://www.freewisdom.org/project/python-markdown/Fenced__Code__Blocks>
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Contact: markdown@freewisdom.org
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License: BSD (see ../docs/LICENSE for details)
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Dependencies:
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* [Python 2.3+](http://python.org)
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* [Markdown 2.0+](http://www.freewisdom.org/projects/python-markdown/)
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"""
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import markdown, re
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# Global vars
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FENCED_BLOCK_RE = re.compile( \
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r'(?P<fence>^~{3,})[ ]*(\{?\.(?P<lang>[a-zA-Z0-9_-]*)\}?)?[ ]*\n(?P<code>.*?)(?P=fence)[ ]*$',
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re.MULTILINE|re.DOTALL
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)
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CODE_WRAP = '<pre><code%s>%s</code></pre>'
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LANG_TAG = ' class="%s"'
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class FencedCodeExtension(markdown.Extension):
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def extendMarkdown(self, md, md_globals):
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""" Add FencedBlockPreprocessor to the Markdown instance. """
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md.preprocessors.add('fenced_code_block',
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FencedBlockPreprocessor(md),
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"_begin")
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class FencedBlockPreprocessor(markdown.preprocessors.Preprocessor):
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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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text = "\n".join(lines)
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while 1:
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m = 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 = LANG_TAG % m.group('lang')
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code = CODE_WRAP % (lang, self._escape(m.group('code')))
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placeholder = self.markdown.htmlStash.store(code, safe=True)
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text = '%s\n%s\n%s'% (text[:m.start()], placeholder, 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(configs=None):
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return FencedCodeExtension()
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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