"use strict";
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function _createForOfIteratorHelperLoose(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; return function () { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } it = o[Symbol.iterator](); return it.next.bind(it); }
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function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
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function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
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function last(array) {
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return array[array.length - 1];
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}
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var brackets = {
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/**
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* Parse string to nodes tree
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*/
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parse: function parse(str) {
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var current = [''];
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var stack = [current];
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for (var _iterator = _createForOfIteratorHelperLoose(str), _step; !(_step = _iterator()).done;) {
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var sym = _step.value;
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if (sym === '(') {
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current = [''];
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last(stack).push(current);
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stack.push(current);
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continue;
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}
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if (sym === ')') {
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stack.pop();
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current = last(stack);
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current.push('');
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continue;
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}
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current[current.length - 1] += sym;
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}
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return stack[0];
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},
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/**
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* Generate output string by nodes tree
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*/
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stringify: function stringify(ast) {
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var result = '';
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for (var _iterator2 = _createForOfIteratorHelperLoose(ast), _step2; !(_step2 = _iterator2()).done;) {
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var i = _step2.value;
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if (typeof i === 'object') {
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result += "(" + brackets.stringify(i) + ")";
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continue;
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}
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result += i;
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}
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return result;
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}
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};
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module.exports = brackets;
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