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Chandler Carruth
437be71f1f
Four regions had `end` patterns that could fail to match, so `return var;`, a `fn` with no parameter list, and an unterminated `"` each swallowed the rest of the file; 77 of 1696 testdata files lost their highlighting partway through. Operators were wrapped in `\b`, which only holds next to a word character, so `a + b` highlighted nothing. And the keywords had drifted about two years behind the lexer. Identifiers are now classified by naming convention plus a call-site lookahead, the way the Rust grammar does it, so nothing carries between lines. Regions survive only for strings and embedded C++, where a terminator reliably turns up, and raw strings spell out hash levels 0 through 2, so `\n` is an escape in `"..."` and plain text in `#"..."#`. Trailing comments, character literals, raw identifiers, `$0`, `0o` octal, arbitrary integer widths and six missing keywords are covered now, `destructor` is gone, and `i32` reads as a type rather than as a keyword. Highlighting stays forgiving rather than diagnostic: anything after `//` is a comment and odd numeric spellings still read as numbers. Pointing out mistakes is the toolchain's job, and lenient rules hold steady while you are still typing. Every keyword and symbol in `token_kind.def` is covered, and unscoped tokens across examples and the toolchain drop from 39% to 21%. Note that I haven't tried to read and reason about every minute change here as there are just too many. But I'm working on a follow-up PR that adds testing that should be significantly easier te review. Assisted-by: Claude Code
Developer Utilities
This directory collects tools and utilities that may be useful to both Carbon developers and developers writing Carbon code.
Editor Support
Other Editors
Any editor that supports Language server protocol and/or tree-sitter is
supported. The editor just needs to be configured manually.
bazel build //toolchain produces the language server binary.
utils/tree_sitter contains the tree-sitter grammar.