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perf(es/lexer): Improve keyword tokenizer (#5658)

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magic-akari 2022-08-29 19:27:11 +08:00 committed by GitHub
parent f06b2536d2
commit 6c2c2587ff
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1 changed files with 76 additions and 40 deletions
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116
crates/swc_ecma_parser/src/lexer/mod.rs
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@ -733,46 +733,82 @@ impl<'a, I: Input> Lexer<'a, I> {
debug_assert!(self.cur().is_some());
let start = self.cur_pos();
let (word, has_escape) = self.read_word_as_str_with(|s| match s {
"null" => Word::Null,
"true" => Word::True,
"false" => Word::False,
"await" => Await.into(),
"break" => Break.into(),
"case" => Case.into(),
"catch" => Catch.into(),
"continue" => Continue.into(),
"debugger" => Debugger.into(),
"default" => Default_.into(),
"do" => Do.into(),
"export" => Export.into(),
"else" => Else.into(),
"finally" => Finally.into(),
"for" => For.into(),
"function" => Function.into(),
"if" => If.into(),
"return" => Return.into(),
"switch" => Switch.into(),
"throw" => Throw.into(),
"try" => Try.into(),
"var" => Var.into(),
"let" => Let.into(),
"const" => Const.into(),
"while" => While.into(),
"with" => With.into(),
"new" => New.into(),
"this" => This.into(),
"super" => Super.into(),
"class" => Class.into(),
"extends" => Extends.into(),
"import" => Import.into(),
"yield" => Yield.into(),
"in" => In.into(),
"instanceof" => InstanceOf.into(),
"typeof" => TypeOf.into(),
"void" => Void.into(),
"delete" => Delete.into(),
_ => Word::Ident(s.into()),
let (word, has_escape) = self.read_word_as_str_with(|s| {
if s.len() == 1 || s.len() > 10 {
Word::Ident(s.into())
} else {
match s.as_bytes()[0] {
b'a' if s == "await" => Await.into(),
b'b' if s == "break" => Break.into(),
b'c' => match s {
"case" => Case.into(),
"const" => Const.into(),
"class" => Class.into(),
"catch" => Catch.into(),
"continue" => Continue.into(),
_ => Word::Ident(s.into()),
},
b'd' => match s {
"do" => Do.into(),
"default" => Default_.into(),
"delete" => Delete.into(),
"debugger" => Debugger.into(),
_ => Word::Ident(s.into()),
},
b'e' => match s {
"else" => Else.into(),
"export" => Export.into(),
"extends" => Extends.into(),
_ => Word::Ident(s.into()),
},
b'f' => match s {
"for" => For.into(),
"false" => Word::False,
"finally" => Finally.into(),
"function" => Function.into(),
_ => Word::Ident(s.into()),
},
b'i' => match s {
"if" => If.into(),
"import" => Import.into(),
"in" => In.into(),
"instanceof" => InstanceOf.into(),
_ => Word::Ident(s.into()),
},
b'l' if s == "let" => Let.into(),
b'n' => match s {
"new" => New.into(),
"null" => Word::Null,
_ => Word::Ident(s.into()),
},
b'r' if s == "return" => Return.into(),
b's' => match s {
"super" => Super.into(),
"switch" => Switch.into(),
_ => Word::Ident(s.into()),
},
b't' => match s {
"this" => This.into(),
"true" => Word::True,
"try" => Try.into(),
"throw" => Throw.into(),
"typeof" => TypeOf.into(),
_ => Word::Ident(s.into()),
},
b'v' => match s {
"var" => Var.into(),
"void" => Void.into(),
_ => Word::Ident(s.into()),
},
b'w' => match s {
"while" => While.into(),
"with" => With.into(),
_ => Word::Ident(s.into()),
},
b'y' if s == "yield" => Yield.into(),
_ => Word::Ident(s.into()),
}
}
})?;
// Note: ctx is store in lexer because of this error.