abbr.py
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'''
Abbreviation Extension for Python-Markdown
==========================================
This extension adds abbreviation handling to Python-Markdown.
See <https://Python-Markdown.github.io/extensions/abbreviations>
for documentation.
Oringinal code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/) and
[Seemant Kulleen](http://www.kulleen.org/)
All changes Copyright 2008-2014 The Python Markdown Project
License: [BSD](https://opensource.org/licenses/bsd-license.php)
'''
from . import Extension
from ..preprocessors import Preprocessor
from ..inlinepatterns import InlineProcessor
from ..util import AtomicString
import re
import xml.etree.ElementTree as etree
# Global Vars
ABBR_REF_RE = re.compile(r'[*]\[(?P<abbr>[^\]]*)\][ ]?:\s*(?P<title>.*)')
class AbbrExtension(Extension):
""" Abbreviation Extension for Python-Markdown. """
def extendMarkdown(self, md):
""" Insert AbbrPreprocessor before ReferencePreprocessor. """
md.preprocessors.register(AbbrPreprocessor(md), 'abbr', 12)
class AbbrPreprocessor(Preprocessor):
""" Abbreviation Preprocessor - parse text for abbr references. """
def run(self, lines):
'''
Find and remove all Abbreviation references from the text.
Each reference is set as a new AbbrPattern in the markdown instance.
'''
new_text = []
for line in lines:
m = ABBR_REF_RE.match(line)
if m:
abbr = m.group('abbr').strip()
title = m.group('title').strip()
self.md.inlinePatterns.register(
AbbrInlineProcessor(self._generate_pattern(abbr), title), 'abbr-%s' % abbr, 2
)
# Preserve the line to prevent raw HTML indexing issue.
# https://github.com/Python-Markdown/markdown/issues/584
new_text.append('')
else:
new_text.append(line)
return new_text
def _generate_pattern(self, text):
'''
Given a string, returns an regex pattern to match that string.
'HTML' -> r'(?P<abbr>[H][T][M][L])'
Note: we force each char as a literal match (in brackets) as we don't
know what they will be beforehand.
'''
chars = list(text)
for i in range(len(chars)):
chars[i] = r'[%s]' % chars[i]
return r'(?P<abbr>\b%s\b)' % (r''.join(chars))
class AbbrInlineProcessor(InlineProcessor):
""" Abbreviation inline pattern. """
def __init__(self, pattern, title):
super().__init__(pattern)
self.title = title
def handleMatch(self, m, data):
abbr = etree.Element('abbr')
abbr.text = AtomicString(m.group('abbr'))
abbr.set('title', self.title)
return abbr, m.start(0), m.end(0)
def makeExtension(**kwargs): # pragma: no cover
return AbbrExtension(**kwargs)