rnix

rnix is a Nix parser written in Rust.

This can be used to manipulate the Nix AST and can for example be used for:

• Interactively render Nix on a GUI
• Formatting Nix code
• Rename identifiers

and a lot more!

rnix ...

• will always maintain span information (line number and column) so the error messages can be as useful as possible and any syntax highlighting plugin could use the tokenizer to highlight.
• works on top of Rust iterators, which are lazy by design. You get cool functions like map and filter at your fingertips!

Demo

Examples can be found in the examples/ directory.

You may also want to see nix-explorer: An example that highlights AST nodes in valid Nix code. This demonstrates how span information is preserved.

Unimplemented

I have implemented everything I can think of. Most, if not all of these, are tested inside the tests/ directory. If some kind of syntax isn't tested there, you should report it as unimplemented.