Elm Syntax Parser in Rust

This project is a port of elm-ast to Rust using the nom parsing libary.

Status

The port is complete. Further testing is required. It will almost certainly prove fragile at the moment.

The elm-ast library is based on 0.18 syntax though it possibly has one or two out of date parts. More testing is required.

Development

You can run the tests with:

cargo test

Please raise issues with any syntax that is not handled properly.

Commands

There is an elm-parser-dump command that will pretty print the generated AST for any file that you give it as an argument:

cargo run examples/Basic.elm

Known Issues

• Only supports top level comments. Possibly requires a macro approach to accept comments every where like in this lua parser.

Future Direction

The plan is to write a basic linter using this parser. It will detect certain issues that the compiler does not report such as:

• Unused variables
• Unused named imports

Reference

• elm-ast
• elm-analyse