Rust-sitter: Define your entire tree-sitter grammar in Rust code

Re:Rust-sitter: Define your entire tree-sitter grammar in Ru... by mcluck on Wednesday February 22, 2023 @12:14PM (#34898893)

Great project!

I'm curious about the set of available parser annotations. I went through the list but I didn't see anything which allows for optional elements. One example would be dangling commas. Did I miss it or are there plans to support such constructs?

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Re:Rust-sitter: Define your entire tree-sitter grammar in Ru... by shadaj on Wednesday February 22, 2023 @12:22PM (#34899059)

We support optional elements by wrapping them in `Option<T>` (other annotations are applied to the contents of the option)! So you can define

  struct ... {
    ...
    #[rust_sitter::leaf(text = ",")
    _dangling_comma: Option<()>
  }

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Re:Rust-sitter: Define your entire tree-sitter grammar in Ru... by mcluck on Wednesday February 22, 2023 @04:24PM (#34903019)

Perfect, thanks!

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