Improve TokenCursor.
#107544
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Improve TokenCursor.
#107544
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Some changes occurred in src/tools/rustfmt cc @rust-lang/rustfmt |
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Sometimes the parser needs to desugar a doc comment into `#[doc = r"foo"]`. Currently it does this in a hacky way: by pushing a "fake" new frame (one without a delimiter) onto the `TokenCursor` stack. This commit changes things so that the token stream itself is modified in place. The nice thing about this is that it means `TokenCursorFrame::delim_sp` is now only `None` for the outermost frame.
The motivation here is to eliminate the `Option<(Delimiter, DelimSpan)>`, which is `None` for the outermost token stream and `Some` for all other token streams. We are already treating the innermost frame specially -- this is the `frame` vs `stack` distinction in `TokenCursor`. We can push that further so that `frame` only contains the cursor, and `stack` elements contain the delimiters for their children. When we are in the outermost token stream `stack` is empty, so there are no stored delimiters, which is what we want because the outermost token stream *has* no delimiters. This change also shrinks `TokenCursor`, which shrinks `Parser` and `LazyAttrTokenStreamImpl`, which is nice.
This makes it clear they return token trees, and makes for a nice comparison against `TokenCursor` which returns tokens.
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…=petrochenkov Improve `TokenCursor`. Some small improvements, for things that were bugging me. Best reviewed one commit at a time. r? `@petrochenkov`
This was referenced Feb 3, 2023
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Rollup of 6 pull requests Successful merges: - rust-lang#107082 (Autotrait bounds on dyn-safe trait methods) - rust-lang#107427 (Add candidates for DiscriminantKind builtin) - rust-lang#107539 (Emit warnings on unused parens in index expressions) - rust-lang#107544 (Improve `TokenCursor`.) - rust-lang#107585 (Don't cause a cycle when formatting query description that references a FnDef) - rust-lang#107633 (Fix suggestion for coercing Option<&String> to Option<&str>) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Some small improvements, for things that were bugging me.
Best reviewed one commit at a time.
r? @petrochenkov