const {
  char,
  mapTo,
  pipeParsers,
  parse,
  sequenceOf,
  str,
  letters,
  choice,
  possibly,
  sepBy,
  many,
  many1,
  anythingExcept,
  digits,
  whitespace,
  between,
  anyOfString,
  recursiveParser
} = require('arcsecond');

const tabspace =  many (anyOfString (' \t')) .map (x => x.join(''));
const whitespaceSurrounded = parser => between (whitespace) (whitespace) (parser);
const tabspaceSurrounded = parser => between (tabspace) (tabspace) (parser);
const spaceSurrounded = parser => between (char (' ')) (char (' ')) (parser);

const parseValue = recursiveParser(() => choice ([
	parseWord,
	parseBlock,
]));

const parseWord = pipeParsers([
	sequenceOf ([
		letters
	]),
	mapTo(x => x.join())
]);

const lineSeparated = sepBy (tabspaceSurrounded (char ('\n')));
const semicolonSeparated = sepBy (tabspaceSurrounded (char (';')));

const parseBlock =
pipeParsers ([
	between
		(whitespaceSurrounded (char ('(')))
		(whitespaceSurrounded (char (')')))
		(lineSeparated (
			semicolonSeparated (
				parseValue
			)
		)),
		mapTo (function(x) {
			console.log('array: ' + x);
			return x;
		})
]);

let result = parse (parseValue) (`(
a;b
(
c;d
))`)
console.log('result.value: ' + JSON.stringify(result.value, null, 2));

if (false) {
result = parse (parseValue) (`(
a;b e
(c;
d
))`)
console.log('result.value: ' + JSON.stringify(result.value, null, 2));
}