67 lines
2.0 KiB
Python
67 lines
2.0 KiB
Python
"""
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Bypass whitespace normalization.
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pymdownx._bypassnorm
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Strips `SOH` and `EOT` characters before whitespace normalization
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allowing other extensions to then create preprocessors that stash HTML
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with `SOH` and `EOT` After whitespace normalization, all `SOH` and
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`EOT` characters will be converted to the Python Markdown standard
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`STX` and `ETX` convention since whitespace normalization usually
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strips out the `STX` and `ETX` characters.
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Copyright 2014 - 2018 Isaac Muse <isaacmuse@gmail.com>
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"""
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from markdown import Extension
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from markdown.util import STX, ETX
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from markdown.preprocessors import Preprocessor
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SOH = '\u0001' # start
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EOT = '\u0004' # end
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class PreNormalizePreprocessor(Preprocessor):
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"""Preprocessor to remove workaround symbols."""
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def run(self, lines):
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"""Remove workaround placeholder markers before adding actual workaround placeholders."""
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source = '\n'.join(lines)
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source = source.replace(SOH, '').replace(EOT, '')
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return source.split('\n')
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class PostNormalizePreprocessor(Preprocessor):
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"""Preprocessor to clean up normalization bypass hack."""
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def run(self, lines):
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"""Convert alternate placeholder symbols to actual placeholder symbols."""
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source = '\n'.join(lines)
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source = source.replace(SOH, STX).replace(EOT, ETX)
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return source.split('\n')
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class BypassNormExtension(Extension):
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"""Bypass whitespace normalization."""
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def __init__(self, *args, **kwargs):
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"""Initialize."""
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self.inlinehilite = []
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self.config = {}
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super().__init__(*args, **kwargs)
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def extendMarkdown(self, md):
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"""Add extensions that help with bypassing whitespace normalization."""
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md.preprocessors.register(PreNormalizePreprocessor(md), "pymdownx-pre-norm-ws", 35)
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md.preprocessors.register(PostNormalizePreprocessor(md), "pymdownx-post-norm-ws", 29.9)
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def makeExtension(*args, **kwargs):
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"""Return extension."""
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return BypassNormExtension(*args, **kwargs)
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