@choo-choo/parser-ebnf

EBNF (ISO/IEC 14977 subset) grammar parser for Choo Choo railroad diagrams.

Parses an EBNF 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-ebnf

Example

import { render } from "@choo-choo/core";
import { ebnfParser } from "@choo-choo/parser-ebnf";

const source = `
digit = "0" | "1" ;
pair  = digit , digit ;
`;

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

Learn more

• Documentation
• GitHub

License

MIT