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python-blog/src/articles/markdown.py
2021-12-31 12:08:35 +01:00

37 lines
1.2 KiB
Python

from markdown import Markdown
from markdown.extensions import Extension
from markdown.inlinepatterns import (
IMAGE_LINK_RE,
IMAGE_REFERENCE_RE,
ImageInlineProcessor,
ImageReferenceInlineProcessor,
)
class LazyImageInlineProcessor(ImageInlineProcessor):
def handleMatch(self, m, data): # type: ignore
el, match_start, index = super().handleMatch(m, data)
if el is not None:
el.set("loading", "lazy")
return el, match_start, index # type: ignore
class LazyImageReferenceInlineProcessor(ImageReferenceInlineProcessor):
def makeTag(self, href, title, text): # type: ignore
el = super().makeTag(href, title, text)
if el is not None:
el.set("loading", "lazy")
return el
class LazyLoadingImageExtension(Extension):
def extendMarkdown(self, md: Markdown) -> None:
md.inlinePatterns.register(
LazyImageInlineProcessor(IMAGE_LINK_RE, md), "image_link", 150
)
md.inlinePatterns.register(
LazyImageReferenceInlineProcessor(IMAGE_REFERENCE_RE, md),
"image_reference",
140,
)
md.registerExtension(self)