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Optimize string handling in lit_token(). #50525

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May 9, 2018
Merged

Optimize string handling in lit_token(). #50525

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23 changes: 17 additions & 6 deletions src/libsyntax/parse/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -419,13 +419,24 @@ pub fn lit_token(lit: token::Lit, suf: Option<Symbol>, diag: Option<(Span, &Hand
token::Integer(s) => (false, integer_lit(&s.as_str(), suf, diag)),
token::Float(s) => (false, float_lit(&s.as_str(), suf, diag)),

token::Str_(s) => {
let s = Symbol::intern(&str_lit(&s.as_str(), diag));
(true, Some(LitKind::Str(s, ast::StrStyle::Cooked)))
token::Str_(mut sym) => {
// If there are no characters requiring special treatment we can
// reuse the symbol from the Token. Otherwise, we must generate a
// new symbol because the string in the LitKind is different to the
// string in the Token.
let s = &sym.as_str();
if s.as_bytes().iter().any(|&c| c == b'\\' || c == b'\r') {
sym = Symbol::intern(&str_lit(s, diag));
}
(true, Some(LitKind::Str(sym, ast::StrStyle::Cooked)))
}
token::StrRaw(s, n) => {
let s = Symbol::intern(&raw_str_lit(&s.as_str()));
(true, Some(LitKind::Str(s, ast::StrStyle::Raw(n))))
token::StrRaw(mut sym, n) => {
// Ditto.
let s = &sym.as_str();
if s.contains('\r') {
sym = Symbol::intern(&raw_str_lit(s));
}
(true, Some(LitKind::Str(sym, ast::StrStyle::Raw(n))))
}
token::ByteStr(i) => {
(true, Some(LitKind::ByteStr(byte_str_lit(&i.as_str()))))
Expand Down