Brian S. Stephan
27d4d16572
I think arguments that "Such new versions will be similar in spirit to the present version", in my own reading and readings such as in https://www.draketo.de/software/gpl-or-later, convince me for now that it is acceptable to allow the "or later" for compatibility and future problem's sake Signed-off-by: Brian S. Stephan <bss@incorporeal.org>
65 lines
2.3 KiB
Python
65 lines
2.3 KiB
Python
"""Create generic figures with captions.
|
|
|
|
SPDX-FileCopyrightText: © 2022 Brian S. Stephan <bss@incorporeal.org>
|
|
SPDX-License-Identifier: GPL-3.0-or-later
|
|
"""
|
|
import re
|
|
from xml.etree.ElementTree import SubElement # nosec B405
|
|
|
|
import markdown
|
|
|
|
|
|
class FigureExtension(markdown.Extension):
|
|
"""Wrap the markdown prepcoressor."""
|
|
|
|
def extendMarkdown(self, md):
|
|
"""Add FigureBlockProcessor to the Markdown instance."""
|
|
md.parser.blockprocessors.register(FigureBlockProcessor(md.parser), 'figure', 100)
|
|
|
|
|
|
class FigureBlockProcessor(markdown.blockprocessors.BlockProcessor):
|
|
"""Process figures."""
|
|
|
|
# |> thing to put in the figure
|
|
# |: optional caption for the figure
|
|
# optional whatever else, like maybe an attr_list
|
|
figure_regex = re.compile(r'^[ ]{0,3}\|>[ ]{0,3}(?P<content>[^\n]*)')
|
|
caption_regex = re.compile(r'^[ ]{0,3}\|:[ ]{0,3}(?P<caption>[^\n]*)')
|
|
|
|
def test(self, parent, block):
|
|
"""Determine if we should process this block."""
|
|
lines = block.split('\n')
|
|
return bool(self.figure_regex.search(lines[0]))
|
|
|
|
def run(self, parent, blocks):
|
|
"""Replace the top block with HTML."""
|
|
block = blocks.pop(0)
|
|
lines = block.split('\n')
|
|
|
|
# consume line and create a figure
|
|
figure_match = self.figure_regex.search(lines[0])
|
|
lines.pop(0)
|
|
content = figure_match.group('content')
|
|
figure = SubElement(parent, 'figure')
|
|
figure.text = content
|
|
if lines:
|
|
if caption_match := self.caption_regex.search(lines[0]):
|
|
# consume line and add the caption as a child of the figure
|
|
lines.pop(0)
|
|
caption = caption_match.group('caption')
|
|
figcaption = SubElement(figure, 'figcaption')
|
|
figcaption.text = caption
|
|
if lines:
|
|
# other lines are mysteries, might be attr_list, so re-append
|
|
# make sure there's a child to hang the rest (which is maybe an attr_list?) off of
|
|
# this is probably a bad hack
|
|
if not len(list(figure)):
|
|
SubElement(figure, 'span')
|
|
rest = '\n'.join(lines)
|
|
figure[-1].tail = f'\n{rest}'
|
|
|
|
|
|
def makeExtension(*args, **kwargs):
|
|
"""Provide the extension to the markdown extension loader."""
|
|
return FigureExtension(*args, **kwargs)
|