# tree-sitter-rust
[![CI][ci]](https://github.com/tree-sitter/tree-sitter-rust/actions/workflows/ci.yml)
[![discord][discord]](https://discord.gg/w7nTvsVJhm)
[![matrix][matrix]](https://matrix.to/#/#tree-sitter-chat:matrix.org)
[![crates][crates]](https://crates.io/crates/tree-sitter-rust)
[![npm][npm]](https://www.npmjs.com/package/tree-sitter-rust)
[![pypi][pypi]](https://pypi.org/project/tree-sitter-rust)
Rust grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).
## Features
- **Speed** — When initially parsing a file, `tree-sitter-rust` takes around two to three times
as long as rustc's hand-written parser.
```sh
$ wc -l examples/ast.rs
2157 examples/ast.rs
$ rustc -Z unpretty=ast-tree -Z time-passes examples/ast.rs | head -n0
time: 0.002; rss: 55MB -> 60MB ( +5MB) parse_crate
$ tree-sitter parse examples/ast.rs --quiet --time
examples/ast.rs 6.48 ms 9908 bytes/ms
```
But if you _edit_ the file after parsing it, tree-sitter can generally _update_
the previous existing syntax tree to reflect your edit in less than a millisecond,
thanks to its incremental parsing system.
## References
- [The Rust Reference](https://doc.rust-lang.org/reference/) — While Rust does
not have a specification, the reference tries to describe its working in detail.
It tends to be out of date.
- [Keywords](https://doc.rust-lang.org/stable/book/appendix-01-keywords.html) and
[Operators and Symbols](https://doc.rust-lang.org/stable/book/appendix-02-operators.html).
[ci]: https://img.shields.io/github/actions/workflow/status/tree-sitter/tree-sitter-rust/ci.yml?logo=github&label=CI
[discord]: https://img.shields.io/discord/1063097320771698699?logo=discord&label=discord
[matrix]: https://img.shields.io/matrix/tree-sitter-chat%3Amatrix.org?logo=matrix&label=matrix
[npm]: https://img.shields.io/npm/v/tree-sitter-rust?logo=npm
[crates]: https://img.shields.io/crates/v/tree-sitter-rust?logo=rust
[pypi]: https://img.shields.io/pypi/v/tree-sitter-rust?logo=pypi&logoColor=ffd242
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