type-sitter

The Industrial Parser Generator. If you can write a JSON Schema for it, this can generate a parser for it.

Generates Tree-Sitter Grammars From TypeScript Definitions. Inspired By Rust-Sitter.

usage

1. Write a base grammar that supports TypeScript primitives:
   any, array, null, number, object, string, bool.

   // use API of GrammarBuilder to define a base grammar with placeholders.
   // placeholders in the returned base grammar is resolved by type-sitter.
   export const baseGrammar: ($$: GrammarBuilder) => string;

2. Express your DSL that goes on top of your base grammar with types.

   export interface Grammar {
     // ... grammar definition using TypeScript typings
   }

3. Use type-sitter to generate a Tree-Sitter grammar.

   # outputs grammar.js and grammar.json
   type-sitter -i grammar.ts

4. Use tree-sitter to make a Tree-Sitter parser.

   # outputs the actual parser
   tree-sitter generate

5. Optionally use grammar.js to further modify the parser and grammar.json to validate ASTs sent over the wire.

See caveats for limitations.
See type-sitter --help for more information.
See examples directory for sample DSLs.

caveats

• Not all TypeScript features are supported. See quicktype for details.
• Duplicated pairs with the same keys but different values do not error out.
• Generated parsers do not replace a data validation layer. Those are mutex.
• This project currently focuses on declarative DSLs vs imperative grammars.