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vendor cookie_re from cpython #1040

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Merged
asottile merged 1 commit into from
Nov 8, 2025
Merged

vendor cookie_re from cpython #1040

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6 changes: 5 additions & 1 deletion pyupgrade/_main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -276,6 +276,10 @@ def _fix_encode_to_binary(tokens: list[Token], i: int) -> None:
del tokens[victims]


# copied from 3.15 @ 0ac890bea7
_cookie_re = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)', re.ASCII)


def _fix_tokens(contents_text: str) -> str:
try:
tokens = src_to_tokens(contents_text)
Expand All @@ -294,7 +298,7 @@ def _fix_tokens(contents_text: str) -> str:
token.utf8_byte_offset == 0 and
token.line < 3 and
token.name == 'COMMENT' and
tokenize.cookie_re.match(token.src)
_cookie_re.match(token.src)
):
del tokens[i]
assert tokens[i].name == 'NL', tokens[i].name
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