217 lines
10 KiB
Python
217 lines
10 KiB
Python
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"""
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Better Emphasis.
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pymdownx.betterem
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Add intelligent handling of to em and strong notations
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MIT license.
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Copyright (c) 2014 - 2017 Isaac Muse <isaacmuse@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
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documentation files (the "Software"), to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions
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of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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"""
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import re
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from markdown import Extension
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from markdown.inlinepatterns import SimpleTextInlineProcessor
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from . import util
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SMART_UNDER_CONTENT = r'(.+?_*?)'
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SMART_STAR_CONTENT = r'(.+?\**?)'
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UNDER_CONTENT = r'(_|(?:(?<=\s)_|[^_])+?)'
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UNDER_CONTENT2 = r'((?:[^_]|(?<!_{2})_)+?)'
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STAR_CONTENT = r'(\*|(?:(?<=\s)\*|[^\*])+?)'
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STAR_CONTENT2 = r'((?:[^\*]|(?<!\*{2})\*)+?)'
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# Avoid starting a pattern with asterisk or underscore tokens that are surrounded by white space.
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NOT_STRONG = r'((^|(?<=\s))(\*+|_+)(?=\s|$))'
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# ***strong,em***
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STAR_STRONG_EM = r'(\*{3})(?!\s)(\*{1,2}|[^\*]+?)(?<!\s)\1'
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# ___strong,em___
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UNDER_STRONG_EM = r'(_{3})(?!\s)(_{1,2}|[^_]+?)(?<!\s)\1'
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# ***strong,em*strong**
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STAR_STRONG_EM2 = r'(\*{{3}})(?![\s\*]){}(?<!\s)\*{}(?<!\s)\*{{2}}'.format(STAR_CONTENT, STAR_CONTENT2)
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# ___strong,em_strong__
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UNDER_STRONG_EM2 = r'(_{{3}})(?![\s_]){}(?<!\s)_{}(?<!\s)_{{2}}'.format(UNDER_CONTENT, UNDER_CONTENT2)
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# ***em,strong**em*
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STAR_EM_STRONG = r'(\*{{3}})(?![\s\*]){}(?<!\s)\*{{2}}{}(?<!\s)\*'.format(STAR_CONTENT2, STAR_CONTENT)
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# **strong*em,strong***
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STAR_STRONG_EM3 = r'(\*{{2}})(?![\s\*]){}\*(?![\s\*]){}(?<!\s)\*{{3}}'.format(STAR_CONTENT, STAR_CONTENT)
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# ___em,strong__em_
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UNDER_EM_STRONG = r'(_{{3}})(?![\s_]){}(?<!\s)_{{2}}{}(?<!\s)_'.format(UNDER_CONTENT2, UNDER_CONTENT)
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# __strong_em,strong___
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UNDER_STRONG_EM3 = r'(_{{2}})(?![\s_]){}_(?![\s_]){}(?<!\s)_{{3}}'.format(UNDER_CONTENT, UNDER_CONTENT)
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# **strong**
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STAR_STRONG = r'(\*{2})(?!\s)%s(?<!\s)\1' % STAR_CONTENT2
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# __strong__
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UNDER_STRONG = r'(_{2})(?!\s)%s(?<!\s)\1' % UNDER_CONTENT2
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# Prioritize *value* when **value** is nested within
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STAR_EM2 = r'(?<!\*)(\*)(?![\*\s])(.+?)(?<![\*\s])(\*)(?!\*)'
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# Prioritize _value_ when __value__ is nested within
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UNDER_EM2 = r'(?<!_)(_)(?![_\s])(.+?)(?<![_\s])(_)(?!_)'
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# *emphasis*
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STAR_EM = r'(\*)(?!\s)%s(?<!\s)\1' % STAR_CONTENT
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# _emphasis_
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UNDER_EM = r'(_)(?!\s)%s(?<!\s)\1' % UNDER_CONTENT
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# Smart rules for when "smart underscore" is enabled
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# SMART: ___strong,em___
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SMART_UNDER_STRONG_EM = r'(?<!\w)(_{3})(?![\s_])%s(?<!\s)\1(?!\w)' % SMART_UNDER_CONTENT
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# ___strong,em_ strong__
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SMART_UNDER_STRONG_EM2 = \
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r'(?<!\w)(_{{3}})(?![\s_]){}(?<!\s)_(?!\w){}(?<!\s)_{{2}}(?!\w)'.format(SMART_UNDER_CONTENT, SMART_UNDER_CONTENT)
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# ___em,strong__ em_
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SMART_UNDER_EM_STRONG = \
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r'(?<!\w)(_{{3}})(?![\s_]){}(?<!\s)_{{2}}(?!\w){}(?<!\s)_(?!\w)'.format(SMART_UNDER_CONTENT, SMART_UNDER_CONTENT)
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# __strong__
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SMART_UNDER_STRONG = r'(?<!\w)(_{2})(?![\s_])%s(?<!\s)\1(?!\w)' % SMART_UNDER_CONTENT
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# SMART _em_
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SMART_UNDER_EM = r'(?<!\w)(_)(?![\s_])%s(?<!\s)\1(?!\w)' % SMART_UNDER_CONTENT
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# Prioritize _value_ when __value__ is nested within
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SMART_UNDER_EM2 = r'(?<![\w_])(_)(?![_\s])(.+?)(?<![_\s])(_)(?![_\w])'
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# Smart rules for when "smart asterisk" is enabled
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# SMART: ***strong,em***
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SMART_STAR_STRONG_EM = r'(?:(?<=_)|(?<![\w\*]))(\*{3})(?![\s\*])%s(?<!\s)\1(?:(?=_)|(?![\w\*]))' % SMART_STAR_CONTENT
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# ***strong,em* strong**
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SMART_STAR_STRONG_EM2 = \
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r'(?:(?<=_)|(?<![\w\*]))(\*{{3}})(?![\s\*]){}(?<!\s)\*(?:(?=_)|(?![\w\*])){}(?<!\s)\*{{2}}(?:(?=_)|(?![\w\*]))'.format(
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SMART_STAR_CONTENT, SMART_STAR_CONTENT
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)
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# ***em,strong** em*
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SMART_STAR_EM_STRONG = \
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r'(?:(?<=_)|(?<![\w\*]))(\*{{3}})(?![\s\*]){}(?<!\s)\*{{2}}(?:(?=_)|(?![\w\*])){}(?<!\s)\*(?:(?=_)|(?![\w\*]))'.format(
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SMART_STAR_CONTENT, SMART_STAR_CONTENT
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)
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# **strong**
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SMART_STAR_STRONG = r'(?:(?<=_)|(?<![\w\*]))(\*{2})(?![\s\*])%s(?<!\s)\1(?:(?=_)|(?![\w\*]))' % SMART_STAR_CONTENT
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# SMART *em*
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SMART_STAR_EM = r'(?:(?<=_)|(?<![\w\*]))(\*)(?![\s\*])%s(?<!\s)\1(?:(?=_)|(?![\w\*]))' % SMART_STAR_CONTENT
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# Prioritize *value* when **value** is nested within
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SMART_STAR_EM2 = r'(?<![\w\*])(\*)(?![\*\s])(.+?)(?<![\*\s])(\*)(?![\*\w])'
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class AsteriskProcessor(util.PatternSequenceProcessor):
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"""Emphasis processor for handling strong and em matches."""
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PATTERNS = [
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util.PatSeqItem(re.compile(STAR_STRONG_EM, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(STAR_EM_STRONG, re.DOTALL | re.UNICODE), 'double', 'em,strong'),
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util.PatSeqItem(re.compile(STAR_STRONG_EM2, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(STAR_STRONG_EM3, re.DOTALL | re.UNICODE), 'double2', 'strong,em'),
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util.PatSeqItem(re.compile(STAR_STRONG, re.DOTALL | re.UNICODE), 'single', 'strong'),
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util.PatSeqItem(re.compile(STAR_EM2, re.DOTALL | re.UNICODE), 'single', 'em', True),
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util.PatSeqItem(re.compile(STAR_EM, re.DOTALL | re.UNICODE), 'single', 'em')
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]
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class SmartAsteriskProcessor(util.PatternSequenceProcessor):
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"""Smart emphasis and strong processor."""
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PATTERNS = [
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util.PatSeqItem(re.compile(SMART_STAR_STRONG_EM, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(SMART_STAR_EM_STRONG, re.DOTALL | re.UNICODE), 'double', 'em,strong'),
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util.PatSeqItem(re.compile(SMART_STAR_STRONG_EM2, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(SMART_STAR_STRONG, re.DOTALL | re.UNICODE), 'single', 'strong'),
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util.PatSeqItem(re.compile(SMART_STAR_EM2, re.DOTALL | re.UNICODE), 'single', 'em', True),
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util.PatSeqItem(re.compile(SMART_STAR_EM, re.DOTALL | re.UNICODE), 'single', 'em')
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]
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class UnderscoreProcessor(util.PatternSequenceProcessor):
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"""Emphasis processor for handling strong and em matches."""
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PATTERNS = [
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util.PatSeqItem(re.compile(UNDER_STRONG_EM, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(UNDER_EM_STRONG, re.DOTALL | re.UNICODE), 'double', 'em,strong'),
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util.PatSeqItem(re.compile(UNDER_STRONG_EM2, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(UNDER_STRONG_EM3, re.DOTALL | re.UNICODE), 'double2', 'strong,em'),
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util.PatSeqItem(re.compile(UNDER_STRONG, re.DOTALL | re.UNICODE), 'single', 'strong'),
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util.PatSeqItem(re.compile(UNDER_EM2, re.DOTALL | re.UNICODE), 'single', 'em', True),
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util.PatSeqItem(re.compile(UNDER_EM, re.DOTALL | re.UNICODE), 'single', 'em')
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]
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class SmartUnderscoreProcessor(util.PatternSequenceProcessor):
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"""Emphasis processor for handling strong and em matches."""
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PATTERNS = [
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util.PatSeqItem(re.compile(SMART_UNDER_STRONG_EM, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(SMART_UNDER_EM_STRONG, re.DOTALL | re.UNICODE), 'double', 'em,strong'),
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util.PatSeqItem(re.compile(SMART_UNDER_STRONG_EM2, re.DOTALL | re.UNICODE), 'double', 'strong,em'),
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util.PatSeqItem(re.compile(SMART_UNDER_STRONG, re.DOTALL | re.UNICODE), 'single', 'strong'),
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util.PatSeqItem(re.compile(SMART_UNDER_EM2, re.DOTALL | re.UNICODE), 'single', 'em', True),
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util.PatSeqItem(re.compile(SMART_UNDER_EM, re.DOTALL | re.UNICODE), 'single', 'em')
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]
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class BetterEmExtension(Extension):
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"""Add extension to Markdown class."""
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def __init__(self, *args, **kwargs):
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"""Initialize."""
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self.config = {
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'smart_enable': ["underscore", "Treat connected words intelligently - Default: underscore"]
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}
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super().__init__(*args, **kwargs)
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def extendMarkdown(self, md):
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"""Modify inline patterns."""
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# Not better yet, so let's make it better
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md.registerExtension(self)
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self.make_better(md)
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def make_better(self, md):
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"""
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Configure all the pattern rules.
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This should be used instead of smart_strong package.
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pymdownx.extra should be used in place of markdown.extensions.extra.
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"""
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config = self.getConfigs()
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enabled = config["smart_enable"]
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enable_all = enabled == "all"
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enable_under = enabled == "underscore" or enable_all
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enable_star = enabled == "asterisk" or enable_all
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# If we don't have to move an existing extension, use the same priority,
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# but if we do have to, move it closely to the relative needed position.
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md.inlinePatterns.deregister('not_strong', False)
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md.inlinePatterns.deregister('strong_em', False)
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md.inlinePatterns.deregister('em_strong', False)
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md.inlinePatterns.deregister('em_strong2', False)
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md.inlinePatterns.deregister('strong', False)
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md.inlinePatterns.deregister('emphasis', False)
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md.inlinePatterns.deregister('strong2', False)
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md.inlinePatterns.deregister('emphasis2', False)
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md.inlinePatterns.register(SimpleTextInlineProcessor(NOT_STRONG), 'not_strong', 70)
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asterisk = SmartAsteriskProcessor(r'\*') if enable_star else AsteriskProcessor(r'\*')
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md.inlinePatterns.register(asterisk, "strong_em", 50)
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underscore = SmartUnderscoreProcessor('_') if enable_under else UnderscoreProcessor('_')
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md.inlinePatterns.register(underscore, "strong_em2", 40)
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def makeExtension(*args, **kwargs):
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"""Return extension."""
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return BetterEmExtension(*args, **kwargs)
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