--- /dev/null
+'use strict';
+
+var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+var last = function last(array) {
+ return array[array.length - 1];
+};
+
+var brackets = {
+
+ /**
+ * Parse string to nodes tree
+ */
+ parse: function parse(str) {
+ var current = [''];
+ var stack = [current];
+
+ for (var i = 0; i < str.length; i++) {
+ var sym = str[i];
+ if (sym === '(') {
+ current = [''];
+ last(stack).push(current);
+ stack.push(current);
+ continue;
+ }
+
+ if (sym === ')') {
+ stack.pop();
+ current = last(stack);
+ current.push('');
+ continue;
+ }
+
+ current[current.length - 1] += sym;
+ }
+
+ return stack[0];
+ },
+
+
+ /**
+ * Generate output string by nodes tree
+ */
+ stringify: function stringify(ast) {
+ var result = '';
+ for (var _iterator = ast, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+ var _ref;
+
+ if (_isArray) {
+ if (_i >= _iterator.length) break;
+ _ref = _iterator[_i++];
+ } else {
+ _i = _iterator.next();
+ if (_i.done) break;
+ _ref = _i.value;
+ }
+
+ var i = _ref;
+
+ if ((typeof i === 'undefined' ? 'undefined' : _typeof(i)) === 'object') {
+ result += '(' + brackets.stringify(i) + ')';
+ continue;
+ }
+
+ result += i;
+ }
+ return result;
+ }
+};
+
+module.exports = brackets;
\ No newline at end of file