80 lines
1.6 KiB
JavaScript
80 lines
1.6 KiB
JavaScript
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"use strict";
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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 = str, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
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var _ref;
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if (_isArray) {
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if (_i >= _iterator.length) break;
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_ref = _iterator[_i++];
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} else {
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_i = _iterator.next();
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if (_i.done) break;
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_ref = _i.value;
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}
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var sym = _ref;
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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 = ast, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
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var _ref2;
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if (_isArray2) {
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if (_i2 >= _iterator2.length) break;
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_ref2 = _iterator2[_i2++];
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} else {
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_i2 = _iterator2.next();
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if (_i2.done) break;
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_ref2 = _i2.value;
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}
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var i = _ref2;
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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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