3 var splitString = require('split-string');
4 var utils = module.exports;
10 utils.extend = require('extend-shallow');
11 utils.flatten = require('arr-flatten');
12 utils.isObject = require('isobject');
13 utils.fillRange = require('fill-range');
14 utils.repeat = require('repeat-element');
15 utils.unique = require('array-unique');
17 utils.define = function(obj, key, val) {
18 Object.defineProperty(obj, key, {
27 * Returns true if the given string contains only empty brace sets.
30 utils.isEmptySets = function(str) {
31 return /^(?:\{,\})+$/.test(str);
35 * Returns true if the given string contains only empty brace sets.
38 utils.isQuotedString = function(str) {
39 var open = str.charAt(0);
40 if (open === '\'' || open === '"' || open === '`') {
41 return str.slice(-1) === open;
47 * Create the key to use for memoization. The unique key is generated
48 * by iterating over the options and concatenating key-value pairs
49 * to the pattern string.
52 utils.createKey = function(pattern, options) {
54 if (typeof options === 'undefined') {
57 var keys = Object.keys(options);
58 for (var i = 0; i < keys.length; i++) {
60 id += ';' + key + '=' + String(options[key]);
69 utils.createOptions = function(options) {
70 var opts = utils.extend.apply(null, arguments);
71 if (typeof opts.expand === 'boolean') {
72 opts.optimize = !opts.expand;
74 if (typeof opts.optimize === 'boolean') {
75 opts.expand = !opts.optimize;
77 if (opts.optimize === true) {
84 * Join patterns in `a` to patterns in `b`
87 utils.join = function(a, b, options) {
88 options = options || {};
89 a = utils.arrayify(a);
90 b = utils.arrayify(b);
92 if (!a.length) return b;
93 if (!b.length) return a;
101 if (Array.isArray(val)) {
102 for (var i = 0; i < val.length; i++) {
103 val[i] = utils.join(val[i], b, options);
109 for (var j = 0; j < b.length; j++) {
112 if (Array.isArray(bval)) {
113 arr.push(utils.join(val, bval, options));
115 arr.push(val + bval);
123 * Split the given string on `,` if not escaped.
126 utils.split = function(str, options) {
127 var opts = utils.extend({sep: ','}, options);
128 if (typeof opts.keepQuotes !== 'boolean') {
129 opts.keepQuotes = true;
131 if (opts.unescape === false) {
132 opts.keepEscaping = true;
134 return splitString(str, opts, utils.escapeBrackets(opts));
138 * Expand ranges or sets in the given `pattern`.
140 * @param {String} `str`
141 * @param {Object} `options`
145 utils.expand = function(str, options) {
146 var opts = utils.extend({rangeLimit: 10000}, options);
147 var segs = utils.split(str, opts);
148 var tok = { segs: segs };
150 if (utils.isQuotedString(str)) {
154 if (opts.rangeLimit === true) {
155 opts.rangeLimit = 10000;
158 if (segs.length > 1) {
159 if (opts.optimize === false) {
164 tok.segs = utils.stringifyArray(tok.segs);
165 } else if (segs.length === 1) {
166 var arr = str.split('..');
168 if (arr.length === 1) {
169 tok.val = tok.segs[tok.segs.length - 1] || tok.val || str;
174 if (arr.length === 2 && arr[0] === arr[1]) {
181 if (arr.length > 1) {
182 if (opts.optimize !== false) {
183 opts.optimize = true;
187 if (opts.optimize !== true) {
188 var min = Math.min(arr[0], arr[1]);
189 var max = Math.max(arr[0], arr[1]);
190 var step = arr[2] || 1;
192 if (opts.rangeLimit !== false && ((max - min) / step >= opts.rangeLimit)) {
193 throw new RangeError('expanded array length exceeds range limit. Use options.rangeLimit to increase or disable the limit.');
198 tok.segs = utils.fillRange.apply(null, arr);
200 if (!tok.segs.length) {
206 if (opts.optimize === true) {
207 tok.segs = utils.stringifyArray(tok.segs);
210 if (tok.segs === '') {
213 tok.val = tok.segs[0];
224 * Ensure commas inside brackets and parens are not split.
225 * @param {Object} `tok` Token from the `split-string` module
226 * @return {undefined}
229 utils.escapeBrackets = function(options) {
230 return function(tok) {
231 if (tok.escaped && tok.val === 'b') {
236 if (tok.val !== '(' && tok.val !== '[') return;
237 var opts = utils.extend({}, options);
245 while (++i < str.length) {
249 val += (opts.keepEscaping === false ? '' : ch) + str[++i];
284 tok.val = val.slice(1);
290 * Returns true if the given string looks like a regex quantifier
294 utils.isQuantifier = function(str) {
295 return /^(?:[0-9]?,[0-9]|[0-9],)$/.test(str);
299 * Cast `val` to an array.
303 utils.stringifyArray = function(arr) {
304 return [utils.arrayify(arr).join('|')];
308 * Cast `val` to an array.
312 utils.arrayify = function(arr) {
313 if (typeof arr === 'undefined') {
316 if (typeof arr === 'string') {
323 * Returns true if the given `str` is a non-empty string
327 utils.isString = function(str) {
328 return str != null && typeof str === 'string';
332 * Get the last element from `array`
333 * @param {Array} `array`
337 utils.last = function(arr, n) {
338 return arr[arr.length - (n || 1)];
341 utils.escapeRegex = function(str) {
342 return str.replace(/\\?([!^*?()[\]{}+?/])/g, '\\$1');