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Rust grammar for tree-sitter
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corpus Allow all kinds of patterns in parameters Dec 12, 2018
examples Parse tokio on CI Aug 3, 2018
script Add features list to README Aug 5, 2018
src Allow abstract types anywhere Dec 12, 2018
.eslintrc.json 👕 Jan 22, 2018
.npmignore Update npmignore Jul 18, 2018
.travis.yml Init Mar 29, 2017
LICENSE Init Mar 29, 2017 Add features list to README Aug 5, 2018
appveyor.yml Add appveyor config Aug 2, 2018
grammar.js Allow abstract types anywhere Dec 12, 2018
package.json 0.13.5 Oct 26, 2018


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Rust grammar for tree-sitter


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

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

  • Token tree parsing - The content of a macro definition or macro invocation is treated by the Rust parser as a token tree - a sequence of tokens with no structure except for the matching of the delimiters (), [], and {}. In practice though, many arguments to macros are valid rust expressions or declarations. For code analysis tasks like syntax highlighting, it's useful to understand the structure of this code.

    Tree-sitter-rust attempts to parse the contents of token trees as expressions and declarations, falling back to unstructured token sequences if it can't find a structured interpretation. Because of Tree-sitter's efficient ambiguity handling, this additional parsing adds only a small performance cost.


  • 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 It tends to be out of date.
  • Syntax Index - This appendix from The Book contains examples of all syntax in Rust cross-referenced with the section of The Book that describes it.
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