tree-sitter-jam

Tree-sitter grammar for the Jam programming language.

Using from Rust

The grammar is published on crates.io as tree-sitter-jam. Add it to your Cargo.toml:

[dependencies]
tree-sitter = "0.25"
tree-sitter-jam = "0.1"

Then load the language and parse Jam source:

let mut parser = tree_sitter::Parser::new();
parser.set_language(&tree_sitter_jam::LANGUAGE.into()).expect("load Jam grammar");
let tree = parser.parse("const MAX: u32 = 64;", None).unwrap();

Highlight queries live in queries/highlights.scm and are bundled into the crate via include in Cargo.toml.

Installing in Zed

The Zed extension lives in editors/zed/ — a language-only extension that references this grammar over git. (Install the editors/zed/ folder, not the repo root: Zed sees the root Cargo.toml and tries to build a Rust extension, which fails.)

To install it as a local dev extension:

1. Open Zed.
2. Open the command palette: Cmd-Shift-P.
3. Run zed: install dev extension.
4. In the file picker, select the editors/zed/ folder of this repository.

Zed reads extension.toml, clones the grammar from the configured repository at the pinned commit, compiles src/parser.c, and loads the editors/zed/languages/jam/ config and queries.

Open any .jam file to confirm — syntax highlighting should kick in, and the language indicator in the bottom-right status bar should read Jam.

Iterating

• After editing queries or editors/zed/languages/jam/config.toml, run zed: reload extensions to pick up the changes.
• If you change the grammar itself, regenerate the parser, commit and push it, then bump rev in extension.toml to the new commit before reloading.

Troubleshooting

• View the log via the command palette → zed: open log.
• For verbose output, launch Zed from a terminal: /Applications/Zed.app/Contents/MacOS/zed --foreground.