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