Bison&Yacc Language Support

v0.1.0 · by fanwenlin · added 3 November 2026

Bison/Yacc Language support

Languages

How to install

With Forge Super installed, the button above opens the app on this extension, where you press Install. Nothing is installed until you do.

You can also open the Extensions panel in the app and search for Bison&Yacc Language Support. The extension's id is bison.

Don't have Forge Super yet? Download it here.

README

From the extension's repository, written by its authors and not by Mentenaz. See the source.

Bison language support for Zed

What's it for

Provide Bison/Yacc editing support in Zed using tree-sitter: syntax highlighting, basic indentation/brackets, outline, and C/C++ code injection inside actions and prologue/epilogue blocks.

Features

Syntax highlighting for Bison/Yacc grammar files.
Basic indentation and bracket matching for Bison/Yacc grammar files.
Outline view for Bison/Yacc grammar files.
C/C++ code injection inside actions and prologue/epilogue blocks.

Directory structure

.
├── extension.toml                # Zed extension manifest
├── languages/
│   └── bison/
│       ├── config.toml           # language metadata, suffixes, comments, brackets
│       ├── highlights.scm        # syntax highlighting captures
│       ├── injections.scm        # C/C++ injections for actions/prologue
│       ├── brackets.scm          # bracket pairs
│       ├── indents.scm           # indentation rules
│       └── outline.scm           # outline entries for rules
├── grammars/
│   └── tree-sitter-bison/        # (optional) locally cloned grammar fork; ignored by git
├── samples/                      # sample .y files for testing
├── scripts/
│   └── verify-grammar.sh         # build grammar (WASM+native) and parse samples
└── README.md

Known limitations

Highlighting is minimal; directives and grammar bodies are covered, but finer semantic scopes (types, precedence hints, %code variants) are still TODO.
Indentation is basic; | continuations and multi-line actions may need tuning.
Injections default to c; if your actions/prologue are C++, switch the injected language accordingly.
Outline only lists rule declarations; declarations (%token, %type, etc.) are not yet surfaced.
Error recovery can surface ERROR nodes on malformed rules; highlight tuning for those is pending.

Thanks to

Grammar: https://gitlab.com/btuin2/tree-sitter-bison. btuin2's work provides most of the grammer implementation.
Zed extension layout follows https://github.com/zed-industries/extensions conventions.

License

Extension configuration, scripts in this repo, and the bundled grammar are LGPL-3.0-or-later per the upstream grammar; include its license files when distributing.