import { Jison } from 'jison';
import { createFilter } from 'rollup-pluginutils';

export default (options = {}) => ({
  name: 'jison',
  transform(grammar, id) {
    const { include = ['*.jison', '**/*.jison'], exclude, type = 'lalr' } = options;
    const filter = createFilter(include, exclude);
    if (!filter(id)) return null;

    const parser = new Jison.Generator(grammar, {
      moduleType: 'js',
      type,
    });

    const source = parser.generate();
    const exporter = `
    const parse = parser.parse.bind(parser);
    parser.parser = parse;
    
    export { parser };
    export default parser;
    `;

    console.log('helll');
    return {
      code: `${source} ${exporter}`,
      map: { mappings: '' },
    };
  },
});