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61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
import os
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import re
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from re import Match
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from xml.etree.ElementTree import Element
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from markdown import Extension, Markdown
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from markdown.blockparser import BlockParser
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from markdown.blockprocessors import BlockProcessor
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from typing_extensions import override
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from zerver.lib.exceptions import InvalidMarkdownIncludeStatementError
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from zerver.lib.markdown.priorities import BLOCK_PROCESSOR_PRIORITIES
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class IncludeExtension(Extension):
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def __init__(self, base_path: str) -> None:
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super().__init__()
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self.base_path = base_path
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@override
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def extendMarkdown(self, md: Markdown) -> None:
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md.parser.blockprocessors.register(
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IncludeBlockProcessor(md.parser, self.base_path),
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"include",
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BLOCK_PROCESSOR_PRIORITIES["include"],
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)
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class IncludeBlockProcessor(BlockProcessor):
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RE = re.compile(r"^ {,3}\{!([^!]+)!\} *$", re.MULTILINE)
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def __init__(self, parser: BlockParser, base_path: str) -> None:
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super().__init__(parser)
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self.base_path = base_path
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@override
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def test(self, parent: Element, block: str) -> bool:
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return bool(self.RE.search(block))
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def expand_include(self, m: Match[str]) -> str:
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try:
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with open(os.path.normpath(os.path.join(self.base_path, m[1]))) as f:
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lines = f.read().splitlines()
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except OSError as e:
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raise InvalidMarkdownIncludeStatementError(m[0].strip()) from e
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for prep in self.parser.md.preprocessors:
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lines = prep.run(lines)
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return "\n".join(lines)
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@override
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def run(self, parent: Element, blocks: list[str]) -> None:
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self.parser.state.set("include")
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self.parser.parseChunk(parent, self.RE.sub(self.expand_include, blocks.pop(0)))
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self.parser.state.reset()
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def makeExtension(base_path: str) -> IncludeExtension:
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return IncludeExtension(base_path=base_path)
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