115 lines
2.7 KiB
JavaScript
115 lines
2.7 KiB
JavaScript
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/*!
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Copyright (c) 2018 Jed Watson.
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Licensed under the MIT License (MIT), see
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http://jedwatson.github.io/classnames
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*/
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/* global define */
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(function () {
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'use strict';
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var classNames = (function () {
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// don't inherit from Object so we can skip hasOwnProperty check later
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// http://stackoverflow.com/questions/15518328/creating-js-object-with-object-createnull#answer-21079232
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function StorageObject() {}
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StorageObject.prototype = Object.create(null);
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function _parseArray (resultSet, array) {
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var length = array.length;
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for (var i = 0; i < length; ++i) {
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_parse(resultSet, array[i]);
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}
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}
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var hasOwn = {}.hasOwnProperty;
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function _parseNumber (resultSet, num) {
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resultSet[num] = true;
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}
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function _parseObject (resultSet, object) {
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if (object.toString === Object.prototype.toString) {
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for (var k in object) {
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if (hasOwn.call(object, k)) {
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// set value to false instead of deleting it to avoid changing object structure
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// https://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/#de-referencing-misconceptions
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resultSet[k] = !!object[k];
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}
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}
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} else {
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resultSet[object.toString()] = true;
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}
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}
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var SPACE = /\s+/;
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function _parseString (resultSet, str) {
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var array = str.split(SPACE);
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var length = array.length;
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for (var i = 0; i < length; ++i) {
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resultSet[array[i]] = true;
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}
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}
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function _parse (resultSet, arg) {
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if (!arg) return;
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var argType = typeof arg;
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// 'foo bar'
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if (argType === 'string') {
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_parseString(resultSet, arg);
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// ['foo', 'bar', ...]
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} else if (Array.isArray(arg)) {
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_parseArray(resultSet, arg);
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// { 'foo': true, ... }
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} else if (argType === 'object') {
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_parseObject(resultSet, arg);
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// '130'
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} else if (argType === 'number') {
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_parseNumber(resultSet, arg);
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}
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}
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function _classNames () {
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// don't leak arguments
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// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#32-leaking-arguments
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var len = arguments.length;
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var args = Array(len);
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for (var i = 0; i < len; i++) {
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args[i] = arguments[i];
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}
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var classSet = new StorageObject();
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_parseArray(classSet, args);
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var list = [];
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for (var k in classSet) {
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if (classSet[k]) {
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list.push(k)
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}
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}
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return list.join(' ');
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}
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return _classNames;
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})();
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if (typeof module !== 'undefined' && module.exports) {
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classNames.default = classNames;
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module.exports = classNames;
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} else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
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// register as 'classnames', consistent with npm package name
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define('classnames', [], function () {
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return classNames;
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});
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} else {
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window.classNames = classNames;
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}
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}());
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