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83 lines
1.9 KiB
Python
83 lines
1.9 KiB
Python
import re
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from html import _replace_charref # type: ignore[attr-defined]
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from typing import Match
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from urllib.parse import quote
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_expand_tab_re = re.compile(r"^( {0,3})\t", flags=re.M)
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def expand_leading_tab(text: str, width: int = 4) -> str:
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def repl(m: Match[str]) -> str:
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s = m.group(1)
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return s + " " * (width - len(s))
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return _expand_tab_re.sub(repl, text)
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def expand_tab(text: str, space: str = " ") -> str:
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repl = r"\1" + space
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return _expand_tab_re.sub(repl, text)
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def escape(s: str, quote: bool = True) -> str:
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"""Escape characters of ``&<>``. If quote=True, ``"`` will be
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converted to ``"e;``."""
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s = s.replace("&", "&")
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s = s.replace("<", "<")
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s = s.replace(">", ">")
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if quote:
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s = s.replace('"', """)
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return s
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def escape_url(link: str) -> str:
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"""Escape URL for safety."""
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safe = (
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":/?#@" # gen-delims - '[]' (rfc3986)
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"!$&()*+,;=" # sub-delims - "'" (rfc3986)
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"%" # leave already-encoded octets alone
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)
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return quote(unescape(link), safe=safe)
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def safe_entity(s: str) -> str:
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"""Escape characters for safety."""
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return escape(unescape(s))
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def unikey(s: str) -> str:
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"""Generate a unique key for links and footnotes."""
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key = " ".join(s.split()).strip()
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return key.lower().upper()
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_charref_re = re.compile(
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r"&(#[0-9]{1,7};"
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r"|#[xX][0-9a-fA-F]+;"
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r"|[^\t\n\f <&#;]{1,32};)"
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)
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def unescape(s: str) -> str:
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"""
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Copy from `html.unescape`, but `_charref` is different. CommonMark
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does not accept entity references without a trailing semicolon
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"""
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if "&" not in s:
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return s
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return _charref_re.sub(_replace_charref, s)
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_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
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def striptags(s: str) -> str:
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return _striptags_re.sub("", s)
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_strip_end_re = re.compile(r"\n\s+$")
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def strip_end(src: str) -> str:
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return _strip_end_re.sub("\n", src)
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