ethowitz / tree-sitter-rust

Rust grammar for tree-sitter

tree-sitter-rust

Rust grammar for tree-sitter

Features

• Speed — When initially parsing a file, tree-sitter-rust takes around twice as long as Rustc's hand-coded parser.

  $ wc -l examples/ast.rs
    2157 examples/ast.rs
  
  $ rustc -Z ast-json-noexpand -Z time-passes examples/ast.rs | head -n1
    time: 0.007    parsing # (7 ms)
  
  $ tree-sitter parse examples/ast.rs --quiet --time
    examples/ast.rs    16 ms

  But if you edit the file after parsing it, this parser can generally update the previous existing syntax tree to reflect your edit in less than a millisecond, thanks to Tree-sitter's incremental parsing system.

References

• The Rust Grammar Reference — The grammar reference provides chapters that formally define the language grammar.
• The Rust 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 It tends to be out of date.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 and Operators and Symbols.
• Archive of the outdated Syntax Index that contains examples of all syntax in Rust cross-referenced with the section of The Book that describes it.