mirror of
https://github.com/ae-utbm/sith.git
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133 lines
3.9 KiB
Python
133 lines
3.9 KiB
Python
#
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# Copyright 2023 © AE UTBM
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# ae@utbm.fr / ae.info@utbm.fr
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#
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# This file is part of the website of the UTBM Student Association (AE UTBM),
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# https://ae.utbm.fr.
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#
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# You can find the source code of the website at https://github.com/ae-utbm/sith
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#
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# LICENSED UNDER THE GNU GENERAL PUBLIC LICENSE VERSION 3 (GPLv3)
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# SEE : https://raw.githubusercontent.com/ae-utbm/sith/master/LICENSE
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# OR WITHIN THE LOCAL FILE "LICENSE"
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#
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#
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from __future__ import annotations
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import re
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from typing import TYPE_CHECKING
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import mistune
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from django.urls import reverse
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from mistune import HTMLRenderer, Markdown
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if TYPE_CHECKING:
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from mistune import InlineParser, InlineState
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# match __text__, without linebreak in the text, nor backslash prepending an underscore
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# Examples :
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# - "__text__" : OK
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# - "__te xt__" : OK
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# - "__te_xt__" : nope (underscore in the middle)
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# - "__te\_xt__" : Ok (the middle underscore is escaped)
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# - "__te\nxt__" : nope (there is a linebreak in the text)
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# - "\__text__" : nope (one of the underscores have a backslash prepended)
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# - "\\__text__" : Ok (the backslash is ignored, because there is another backslash before)
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UNDERLINED_RE = (
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r"(?<!\\)(?:\\{2})*" # ignore if there is an odd number of backslashes before
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r"_{2}" # two underscores
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r"(?P<underlined>([^\\_]|\\.)+)" # the actual text
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r"_{2}" # closing underscores
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)
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SITH_LINK_RE = (
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r"\[(?P<page_name>[\w\s]+)\]" # [nom du lien]
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r"\(page:\/\/" # (page://
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r"(?P<page_slug>[a-zA-Z0-9][a-zA-Z0-9.-]*[a-zA-Z0-9])" # actual page name
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r"\)" # )
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)
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CUSTOM_DIMENSIONS_IMAGE_RE = (
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r"\[(?P<img_name>[\w\s]+)\]" # [nom du lien]
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r"\(img:\/\/" # (img://
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r"(?P<img_slug>[a-zA-Z0-9][a-zA-Z0-9.-]*[a-zA-Z0-9])" # actual page name
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r"\)" # )
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)
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def parse_underline(_inline: InlineParser, m: re.Match, state: InlineState):
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state.append_token({"type": "underline", "raw": m.group("underlined")})
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return m.end()
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def underline(md_instance: Markdown):
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md_instance.inline.register(
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"underline",
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UNDERLINED_RE,
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parse_underline,
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before="emphasis",
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)
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md_instance.renderer.register("underline", lambda _, text: f"<u>{text}</u>")
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def parse_sith_link(_inline: InlineParser, m: re.Match, state: InlineState):
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page_name = m.group("page_name")
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page_slug = m.group("page_slug")
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state.append_token(
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{
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"type": "link",
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"children": [{"type": "text", "raw": page_name}],
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"attrs": {"url": reverse("core:page", kwargs={"page_name": page_slug})},
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}
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)
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return m.end()
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def sith_link(md_instance: Markdown):
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md_instance.inline.register(
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"sith_link",
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SITH_LINK_RE,
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parse_sith_link,
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before="emphasis",
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)
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# no custom renderer here.
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# we just add another parsing rule, but render it as if it was
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# a regular markdown link
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class SithRenderer(HTMLRenderer):
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def image(self, text: str, url: str, title=None) -> str:
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if "?" not in url:
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return super().image(text, url, title)
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new_url, params = url.rsplit("?", maxsplit=1)
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m = re.match(r"^(?P<width>\d+(%|px)?)(x(?P<height>\d+(%|px)?))?$", params)
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if not m:
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return super().image(text, url, title)
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width, height = m.group("width"), m.group("height")
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if not width.endswith(("%", "px")):
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width += "px"
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style = f"width:{width};"
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if height is not None:
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if not height.endswith(("%", "px")):
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height += "px"
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style += f"height:{height};"
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return super().image(text, new_url, title).replace("/>", f'style="{style}" />')
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markdown = mistune.create_markdown(
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renderer=SithRenderer(escape=True),
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plugins=[
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underline,
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sith_link,
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"strikethrough",
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"footnotes",
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"table",
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"spoiler",
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"subscript",
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"superscript",
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"url",
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],
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)
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