mirror of https://github.com/zulip/zulip.git
75 lines
3.0 KiB
Python
75 lines
3.0 KiB
Python
from markdown.extensions import Extension
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from typing import Any, Dict, Optional, List, Tuple
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import markdown
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from xml.etree.cElementTree import Element
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from zerver.lib.bugdown import walk_tree_with_family, ResultWithFamily
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class NestedCodeBlocksRenderer(Extension):
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def extendMarkdown(self, md: markdown.Markdown, md_globals: Dict[str, Any]) -> None:
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md.treeprocessors.add(
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'nested_code_blocks',
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NestedCodeBlocksRendererTreeProcessor(md, self.getConfigs()),
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'_end'
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)
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class NestedCodeBlocksRendererTreeProcessor(markdown.treeprocessors.Treeprocessor):
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def __init__(self, md: markdown.Markdown, config: Dict[str, Any]) -> None:
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super().__init__(md)
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def run(self, root: Element) -> None:
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code_tags = walk_tree_with_family(root, self.get_code_tags)
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nested_code_blocks = self.get_nested_code_blocks(code_tags)
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for block in nested_code_blocks:
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tag, text = block.result
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codehilite_block = self.get_codehilite_block(text)
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self.replace_element(block.family.grandparent,
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codehilite_block,
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block.family.parent)
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def get_code_tags(self, e: Element) -> Optional[Tuple[str, Optional[str]]]:
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if e.tag == "code":
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return (e.tag, e.text)
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return None
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def get_nested_code_blocks(
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self, code_tags: List[ResultWithFamily[Tuple[str, Optional[str]]]]
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) -> List[ResultWithFamily[Tuple[str, Optional[str]]]]:
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nested_code_blocks = []
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for code_tag in code_tags:
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parent: Any = code_tag.family.parent
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grandparent: Any = code_tag.family.grandparent
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if parent.tag == "p" and grandparent.tag == "li":
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# if the parent (<p>) has no text, and no children,
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# that means that the <code> element inside is its
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# only thing inside the bullet, we can confidently say
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# that this is a nested code block
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if parent.text is None and len(list(parent)) == 1 and len(list(parent.itertext())) == 1:
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nested_code_blocks.append(code_tag)
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return nested_code_blocks
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def get_codehilite_block(self, code_block_text: Optional[str]) -> Element:
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div = markdown.util.etree.Element("div")
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div.set("class", "codehilite")
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pre = markdown.util.etree.SubElement(div, "pre")
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pre.text = code_block_text
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return div
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def replace_element(
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self, parent: Optional[Element],
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replacement: markdown.util.etree.Element,
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element_to_replace: Element
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) -> None:
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if parent is None:
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return
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children = parent.getchildren()
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for index, child in enumerate(children):
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if child is element_to_replace:
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parent.insert(index, replacement)
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parent.remove(element_to_replace)
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def makeExtension(*args: Any, **kwargs: str) -> NestedCodeBlocksRenderer:
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return NestedCodeBlocksRenderer(**kwargs)
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