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Short circuit lex_identifier if the name is longer or shorter than any known keyword (#13815)

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Micha Reiser 2024-10-19 13:07:15 +02:00 • committed by GitHub
parent 6964eef369
commit bd33b4972d
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8
crates/ruff_python_parser/src/lexer.rs
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@ -648,6 +648,14 @@ impl<'src> Lexer<'src> {
return TokenKind::Name; return TokenKind::Name;
} }
// Short circuit for names that are longer than any known keyword.
// It helps Rust to predict that the Name::new call in the keyword match's default branch
// is guaranteed to fit into a stack allocated (inline) Name.
if text.len() > 8 {
self.current_value = TokenValue::Name(Name::new(text));
return TokenKind::Name;
}
match text { match text {
"False" => TokenKind::False, "False" => TokenKind::False,
"None" => TokenKind::None, "None" => TokenKind::None,