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Remove ASCII fast path from rustc_lexer::{is_id_continue, is_id_start} #87499

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merged 2 commits into from
Jul 27, 2021
Merged

Remove ASCII fast path from rustc_lexer::{is_id_continue, is_id_start} #87499

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a397fdc
Remove ASCII fast path from rustc_lexer::{is_id_continue, is_id_start}
ibraheemdev Jul 27, 2021
de27d68
update unicode-xid dependency
ibraheemdev Jul 27, 2021
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14 changes: 2 additions & 12 deletions compiler/rustc_lexer/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -273,24 +273,14 @@ pub fn is_whitespace(c: char) -> bool {
/// a formal definition of valid identifier name.
pub fn is_id_start(c: char) -> bool {
// This is XID_Start OR '_' (which formally is not a XID_Start).
// We also add fast-path for ascii idents
('a'..='z').contains(&c)
|| ('A'..='Z').contains(&c)
|| c == '_'
|| (c > '\x7f' && unicode_xid::UnicodeXID::is_xid_start(c))
c == '_' || unicode_xid::UnicodeXID::is_xid_start(c)
}

/// True if `c` is valid as a non-first character of an identifier.
/// See [Rust language reference](https://doc.rust-lang.org/reference/identifiers.html) for
/// a formal definition of valid identifier name.
pub fn is_id_continue(c: char) -> bool {
// This is exactly XID_Continue.
// We also add fast-path for ascii idents
('a'..='z').contains(&c)
|| ('A'..='Z').contains(&c)
|| ('0'..='9').contains(&c)
|| c == '_'
|| (c > '\x7f' && unicode_xid::UnicodeXID::is_xid_continue(c))
unicode_xid::UnicodeXID::is_xid_continue(c)
}

/// The passed string is lexically an identifier.
Expand Down