165 lines
5.4 KiB
Python
165 lines
5.4 KiB
Python
"""
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Admonition extension for Python-Markdown
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========================================
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Adds rST-style admonitions. Inspired by [rST][] feature with the same name.
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[rST]: http://docutils.sourceforge.net/docs/ref/rst/directives.html#specific-admonitions # noqa
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See <https://Python-Markdown.github.io/extensions/admonition>
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for documentation.
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Original code Copyright [Tiago Serafim](https://www.tiagoserafim.com/).
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All changes Copyright 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 ..blockprocessors import BlockProcessor
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import xml.etree.ElementTree as etree
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import re
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class AdmonitionExtension(Extension):
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""" Admonition extension for Python-Markdown. """
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def extendMarkdown(self, md):
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""" Add Admonition to Markdown instance. """
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md.registerExtension(self)
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md.parser.blockprocessors.register(AdmonitionProcessor(md.parser), 'admonition', 105)
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class AdmonitionProcessor(BlockProcessor):
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CLASSNAME = 'admonition'
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CLASSNAME_TITLE = 'admonition-title'
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RE = re.compile(r'(?:^|\n)!!! ?([\w\-]+(?: +[\w\-]+)*)(?: +"(.*?)")? *(?:\n|$)')
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RE_SPACES = re.compile(' +')
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def __init__(self, parser):
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"""Initialization."""
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super().__init__(parser)
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self.current_sibling = None
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self.content_indention = 0
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def get_sibling(self, parent, block):
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"""Get sibling admontion.
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Retrieve the appropriate siblimg element. This can get trickly when
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dealing with lists.
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"""
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# We already acquired the block via test
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if self.current_sibling is not None:
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sibling = self.current_sibling
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block = block[self.content_indent:]
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self.current_sibling = None
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self.content_indent = 0
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return sibling, block
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sibling = self.lastChild(parent)
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if sibling is None or sibling.get('class', '').find(self.CLASSNAME) == -1:
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sibling = None
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else:
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# If the last child is a list and the content is idented sufficient
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# to be under it, then the content's is sibling is in the list.
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last_child = self.lastChild(sibling)
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indent = 0
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while last_child:
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if (
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sibling and block.startswith(' ' * self.tab_length * 2) and
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last_child and last_child.tag in ('ul', 'ol', 'dl')
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):
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# The expectation is that we'll find an <li> or <dt>.
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# We should get it's last child as well.
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sibling = self.lastChild(last_child)
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last_child = self.lastChild(sibling) if sibling else None
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# Context has been lost at this point, so we must adjust the
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# text's identation level so it will be evaluated correctly
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# under the list.
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block = block[self.tab_length:]
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indent += self.tab_length
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else:
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last_child = None
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if not block.startswith(' ' * self.tab_length):
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sibling = None
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if sibling is not None:
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self.current_sibling = sibling
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self.content_indent = indent
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return sibling, block
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def test(self, parent, block):
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if self.RE.search(block):
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return True
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else:
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return self.get_sibling(parent, block)[0] is not None
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def run(self, parent, blocks):
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block = blocks.pop(0)
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m = self.RE.search(block)
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if m:
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block = block[m.end():] # removes the first line
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else:
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sibling, block = self.get_sibling(parent, block)
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block, theRest = self.detab(block)
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if m:
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klass, title = self.get_class_and_title(m)
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div = etree.SubElement(parent, 'div')
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div.set('class', '{} {}'.format(self.CLASSNAME, klass))
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if title:
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p = etree.SubElement(div, 'p')
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p.text = title
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p.set('class', self.CLASSNAME_TITLE)
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else:
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# Sibling is a list item, but we need to wrap it's content should be wrapped in <p>
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if sibling.tag in ('li', 'dd') and sibling.text:
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text = sibling.text
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sibling.text = ''
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p = etree.SubElement(sibling, 'p')
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p.text = text
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div = sibling
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self.parser.parseChunk(div, block)
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if theRest:
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# This block contained unindented line(s) after the first indented
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# line. Insert these lines as the first block of the master blocks
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# list for future processing.
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blocks.insert(0, theRest)
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def get_class_and_title(self, match):
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klass, title = match.group(1).lower(), match.group(2)
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klass = self.RE_SPACES.sub(' ', klass)
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if title is None:
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# no title was provided, use the capitalized classname as title
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# e.g.: `!!! note` will render
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# `<p class="admonition-title">Note</p>`
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title = klass.split(' ', 1)[0].capitalize()
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elif title == '':
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# an explicit blank title should not be rendered
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# e.g.: `!!! warning ""` will *not* render `p` with a title
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title = None
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return klass, title
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def makeExtension(**kwargs): # pragma: no cover
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return AdmonitionExtension(**kwargs)
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