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Avoid some re-interning in to_lit_token.

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This commit is contained in:
Nicholas Nethercote 2019-05-23 12:34:38 +10:00
parent 21f28448e0
commit 303bf1509b
1 changed files with 8 additions and 5 deletions
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13
src/libsyntax/parse/literal.rs
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@ -171,12 +171,15 @@ impl LitKind {
/// by an AST-based macro) or unavailable (e.g. from HIR pretty-printing).
pub fn to_lit_token(&self) -> token::Lit {
let (kind, symbol, suffix) = match *self {
LitKind::Str(string, ast::StrStyle::Cooked) => {
let escaped = string.as_str().escape_default().to_string();
(token::Str, Symbol::intern(&escaped), None)
LitKind::Str(symbol, ast::StrStyle::Cooked) => {
// Don't re-intern unless the escaped string is different.
let s = &symbol.as_str();
let escaped = s.escape_default().to_string();
let symbol = if escaped == *s { symbol } else { Symbol::intern(&escaped) };
(token::Str, symbol, None)
}
LitKind::Str(string, ast::StrStyle::Raw(n)) => {
(token::StrRaw(n), string, None)
LitKind::Str(symbol, ast::StrStyle::Raw(n)) => {
(token::StrRaw(n), symbol, None)
}
LitKind::ByteStr(ref bytes) => {
let string = bytes.iter().cloned().flat_map(ascii::escape_default)