Forth grammar for tree-sitter - a fast, incremental parser for syntax highlighting and code analysis.

• Complete number support: Decimal, hex (0xFF, $FF), binary (%1010), octal (&77), character literals ('c'), floats (3.14, 1.5e-10), and double-cell numbers (123.)
• Semantic categorization: Control flow, operators, I/O, and core words are distinct AST nodes for better syntax highlighting
• Case-insensitive: All Forth keywords are case-insensitive as per standard
• Comment types: Line comments (\), block comments, and stack effect comments (( n -- result )) parsed separately
• String types: s", S", c", C", and ." with proper tokenization
• Bindings: Node.js and Rust support

npm install tree-sitter-forth

# Generate parser
npm run build

# Run tests
npm test

# Parse a file
npm run parse -- file.fs

The grammar categorizes Forth words into semantic groups:

• Control Flow: IF/THEN/ELSE, BEGIN/UNTIL, DO/LOOP, CASE/OF, etc.
• Operators: Stack manipulation (DUP, SWAP, ROT), arithmetic (+, -, MOD), logic (AND, OR)
• I/O: Input/output words (., EMIT, KEY, ACCEPT)
• Core: Defining words, memory operations, compilation words

MIT