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Fix DebugParser. #127273

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Merged
merged 3 commits into from
Jul 14, 2024
Merged

Fix DebugParser. #127273

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69f6145
Change `look` from a macro to a function.
nnethercote Jul 13, 2024
cf2dfb2
Add a test for `Parser::debug_lookahead`.
nnethercote Jul 13, 2024
aa0e8e1
Fix `DebugParser`.
nnethercote Jul 13, 2024
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18 changes: 10 additions & 8 deletions compiler/rustc_parse/src/parser/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1537,14 +1537,16 @@ impl<'a> Parser<'a> {

// we don't need N spans, but we want at least one, so print all of prev_token
dbg_fmt.field("prev_token", &parser.prev_token);
// make it easier to peek farther ahead by taking TokenKinds only until EOF
let tokens = (0..*lookahead)
.map(|i| parser.look_ahead(i, |tok| tok.kind.clone()))
.scan(parser.prev_token == TokenKind::Eof, |eof, tok| {
let current = eof.then_some(tok.clone()); // include a trailing EOF token
*eof |= &tok == &TokenKind::Eof;
current
});
let mut tokens = vec![];
for i in 0..*lookahead {
let tok = parser.look_ahead(i, |tok| tok.kind.clone());
let is_eof = tok == TokenKind::Eof;
tokens.push(tok);
if is_eof {
// Don't look ahead past EOF.
break;
}
}
dbg_fmt.field_with("tokens", |field| field.debug_list().entries(tokens).finish());
dbg_fmt.field("approx_token_stream_pos", &parser.num_bump_calls);

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