Tree-sitter grammar for parsing unified diff files

• Grammar: grammar.js
• Generated parser artifacts: src/parser.c, src/grammar.json, src/node-types.json
• Tree-sitter runtime headers (vendored): src/tree_sitter/*.h
• Corpus tests: test/corpus/unified_diff.txt
• Highlight queries: queries/highlights.scm
• Tree-sitter config: tree-sitter.json

• Node.js + npm
• Tree-sitter CLI

Install CLI (if needed):

npm install -g tree-sitter-cli

or use npx without global install:

npx tree-sitter generate

Install dependencies (optional but recommended for script-based usage):

npm install

Generate parser artifacts:

npm run generate
# or: tree-sitter generate

Run grammar corpus tests:

npm test
# or: tree-sitter test

• preamble lines before file patches
• file headers:
  • --- <path>
  • +++ <path>
• hunk headers:
  • @@ -start[,count] +start[,count] @@[ section]
• hunk body lines:
  • context ( )
  • additions (+)
  • deletions (-)
  • note (\ No newline at end of file)
• multiple file patches in one document

This repository is a standard Tree-sitter grammar package. Typical consumption paths:

npm pack

Then use the packaged grammar from your Tree-sitter binding/tooling environment (Node, Rust, Python, etc.) as configured by tree-sitter.json.

For parser development:

tree-sitter parse path/to/file.diff