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95 lines
2.8 KiB
95 lines
2.8 KiB
4 years ago
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'''
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Abbreviation Extension for Python-Markdown
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==========================================
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This extension adds abbreviation handling to Python-Markdown.
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See <https://Python-Markdown.github.io/extensions/abbreviations>
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for documentation.
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Oringinal code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/) and
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[Seemant Kulleen](http://www.kulleen.org/)
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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 ..inlinepatterns import InlineProcessor
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from ..util import AtomicString
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import re
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import xml.etree.ElementTree as etree
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# Global Vars
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ABBR_REF_RE = re.compile(r'[*]\[(?P<abbr>[^\]]*)\][ ]?:\s*(?P<title>.*)')
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class AbbrExtension(Extension):
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""" Abbreviation Extension for Python-Markdown. """
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def extendMarkdown(self, md):
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""" Insert AbbrPreprocessor before ReferencePreprocessor. """
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md.preprocessors.register(AbbrPreprocessor(md), 'abbr', 12)
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class AbbrPreprocessor(Preprocessor):
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""" Abbreviation Preprocessor - parse text for abbr references. """
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def run(self, lines):
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'''
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Find and remove all Abbreviation references from the text.
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Each reference is set as a new AbbrPattern in the markdown instance.
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'''
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new_text = []
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for line in lines:
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m = ABBR_REF_RE.match(line)
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if m:
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abbr = m.group('abbr').strip()
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title = m.group('title').strip()
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self.md.inlinePatterns.register(
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AbbrInlineProcessor(self._generate_pattern(abbr), title), 'abbr-%s' % abbr, 2
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)
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# Preserve the line to prevent raw HTML indexing issue.
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# https://github.com/Python-Markdown/markdown/issues/584
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new_text.append('')
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else:
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new_text.append(line)
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return new_text
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def _generate_pattern(self, text):
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'''
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Given a string, returns an regex pattern to match that string.
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'HTML' -> r'(?P<abbr>[H][T][M][L])'
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Note: we force each char as a literal match (in brackets) as we don't
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know what they will be beforehand.
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'''
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chars = list(text)
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for i in range(len(chars)):
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chars[i] = r'[%s]' % chars[i]
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return r'(?P<abbr>\b%s\b)' % (r''.join(chars))
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class AbbrInlineProcessor(InlineProcessor):
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""" Abbreviation inline pattern. """
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def __init__(self, pattern, title):
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super().__init__(pattern)
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self.title = title
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def handleMatch(self, m, data):
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abbr = etree.Element('abbr')
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abbr.text = AtomicString(m.group('abbr'))
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abbr.set('title', self.title)
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return abbr, m.start(0), m.end(0)
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def makeExtension(**kwargs): # pragma: no cover
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return AbbrExtension(**kwargs)
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