@choo-choo/parser-antlr

ANTLR4 grammar parser for Choo Choo railroad diagrams.

Parses an ANTLR4 grammar source string and returns an ordered list of rules, each with an IR tree ready to render.

Install

npm install @choo-choo/core @choo-choo/parser-antlr

Example

import { render } from "@choo-choo/core";
import { antlrParser } from "@choo-choo/parser-antlr";

const source = `
grammar Demo;
pair : digit digit ;
digit : '0' | '1' ;
`;

const parsed = antlrParser.parse(source);
const pair = parsed.rules.find((r) => r.name === "pair")!;
const svg = render(pair.diagram);

Learn more

• Documentation
• GitHub

License

MIT