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"""Markdown filters with mistune
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Used from markdown.py
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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import re
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import mistune
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from pygments import highlight
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from pygments.lexers import get_lexer_by_name
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from pygments.formatters import HtmlFormatter
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from pygments.util import ClassNotFound
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from IPython.nbconvert.filters.strings import add_anchor
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from IPython.nbconvert.utils.exceptions import ConversionException
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from IPython.utils.decorators import undoc
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@undoc
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class MathBlockGrammar(mistune.BlockGrammar):
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block_math = re.compile(r"^\$\$(.*?)\$\$", re.DOTALL)
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latex_environment = re.compile(r"^\\begin\{([a-z]*\*?)\}(.*?)\\end\{\1\}",
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re.DOTALL)
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@undoc
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class MathBlockLexer(mistune.BlockLexer):
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default_rules = ['block_math', 'latex_environment'] + mistune.BlockLexer.default_rules
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def __init__(self, rules=None, **kwargs):
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if rules is None:
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rules = MathBlockGrammar()
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super(MathBlockLexer, self).__init__(rules, **kwargs)
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def parse_block_math(self, m):
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"""Parse a $$math$$ block"""
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self.tokens.append({
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'type': 'block_math',
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'text': m.group(1)
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})
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def parse_latex_environment(self, m):
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self.tokens.append({
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'type': 'latex_environment',
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'name': m.group(1),
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'text': m.group(2)
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})
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@undoc
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class MathInlineGrammar(mistune.InlineGrammar):
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math = re.compile(r"^\$(.+?)\$")
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block_math = re.compile(r"^\$\$(.+?)\$\$", re.DOTALL)
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text = re.compile(r'^[\s\S]+?(?=[\\<!\[_*`~$]|https?://| {2,}\n|$)')
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@undoc
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class MathInlineLexer(mistune.InlineLexer):
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default_rules = ['math', 'block_math'] + mistune.InlineLexer.default_rules
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def __init__(self, renderer, rules=None, **kwargs):
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if rules is None:
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rules = MathInlineGrammar()
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super(MathInlineLexer, self).__init__(renderer, rules, **kwargs)
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def output_math(self, m):
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return self.renderer.inline_math(m.group(1))
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def output_block_math(self, m):
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return self.renderer.block_math(m.group(1))
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@undoc
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class MarkdownWithMath(mistune.Markdown):
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def __init__(self, renderer, **kwargs):
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if 'inline' not in kwargs:
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kwargs['inline'] = MathInlineLexer
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if 'block' not in kwargs:
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kwargs['block'] = MathBlockLexer
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super(MarkdownWithMath, self).__init__(renderer, **kwargs)
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def output_block_math(self):
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return self.renderer.block_math(self.token['text'])
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def output_latex_environment(self):
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return self.renderer.latex_environment(self.token['name'], self.token['text'])
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@undoc
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class IPythonRenderer(mistune.Renderer):
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def block_code(self, code, lang):
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if lang:
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try:
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lexer = get_lexer_by_name(lang, stripall=True)
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except ClassNotFound:
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code = lang + '\n' + code
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lang = None
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if not lang:
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return '\n<pre><code>%s</code></pre>\n' % \
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mistune.escape(code)
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formatter = HtmlFormatter()
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return highlight(code, lexer, formatter)
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def header(self, text, level, raw=None):
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html = super(IPythonRenderer, self).header(text, level, raw=raw)
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return add_anchor(html)
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# Pass math through unaltered - mathjax does the rendering in the browser
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def block_math(self, text):
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return '$$%s$$' % text
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def latex_environment(self, name, text):
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return r'\begin{%s}%s\end{%s}' % (name, text, name)
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def inline_math(self, text):
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return '$%s$' % text
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def markdown2html_mistune(source):
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"""Convert a markdown string to HTML using mistune"""
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return MarkdownWithMath(renderer=IPythonRenderer()).render(source)
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