https://github.com/the-mikedavis/tree-sitter-erlang

An Erlang grammar for tree-sitter
https://github.com/the-mikedavis/tree-sitter-erlang

erlang lexer parser tree-sitter

Last synced: about 1 year ago
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An Erlang grammar for tree-sitter

• Host: GitHub
• URL: https://github.com/the-mikedavis/tree-sitter-erlang
• Owner: the-mikedavis
• License: apache-2.0
• Created: 2022-02-11T05:01:38.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2025-02-06T01:09:18.000Z (over 1 year ago)
• Last Synced: 2025-03-31T13:37:00.620Z (over 1 year ago)
• Topics: erlang, lexer, parser, tree-sitter
• Language: JavaScript
• Homepage: https://the-mikedavis.github.io/tree-sitter-erlang/
• Size: 5.54 MB
• Stars: 9
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# tree-sitter-erlang

[![CI](https://github.com/the-mikedavis/tree-sitter-erlang/actions/workflows/ci.yml/badge.svg)](https://github.com/the-mikedavis/tree-sitter-erlang/actions/workflows/ci.yml)

An Erlang grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).

See the [docs](./docs/README.md) for design and development information.



_Above: an [excerpt](https://github.com/rabbitmq/khepri/blob/9fbf7ec827bbf38c81a5bc69a128eec4bde3cdf9/src/khepri_fun.erl#L1142-L1155) from [rabbitmq/khepri](https://github.com/rabbitmq/khepri) using this grammar in the [Helix](https://github.com/helix-editor/helix) editor._

## Caveat

From the

[docs](https://github.com/erlang/otp/blob/9e381125bbd93dfa2f17d4954b54aead749bf012/system/doc/reference_manual/macros.xml#L127-L128)

on macros:

> It is good programming practice, but not mandatory, to ensure

> that a macro definition is a valid Erlang syntactic form.

This grammar attempts to parse within `define` attributes with best-effort

but some macro definitions and their resulting macros may produce `(ERROR)`

nodes.

## Status

It's pretty complete despite the above caveat. It has a 99.58% pass rate

against the .erl/.hrl files in the OTP codebase[^1]. Try it out on the online

[playground](https://the-mikedavis.github.io/tree-sitter-erlang/).

[^1]: The remaining files that exhibit errors are either not truly Erlang

      or use preprocessor directives with blatantly invalid syntax. This

      can be measured with

      `tree-sitter parse --quiet --stat path/to/otp/**.{erl,hrl}`.

## License

This project is licensed under the Apache-2.0 license. Any files under

the `queries/` directory are licensed under the BSD 0-clause license.