@choo-choo/parser-python-peg

Python PEG (pegen dialect) grammar parser for Choo Choo railroad diagrams.

Parses the Python PEG meta-grammar — the dialect used in docs.python.org/3/reference/grammar.html — and returns an ordered list of rules, each with an IR tree ready to render.

This is a different dialect from the peggy parser shipped in @choo-choo/parser-peg. See the spec for the full diff.

Install

npm install @choo-choo/core @choo-choo/parser-python-peg

Example

import { render } from "@choo-choo/core";
import { pythonPegParser } from "@choo-choo/parser-python-peg";

const source = `
boolean:
    | 'True'
    | 'False'
    | 'None'

import_from_as_names: ','.import_from_as_name+
`;

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

Learn more

• Documentation
• GitHub

License

MIT