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/*!
Copyright (c) 2016 Jed Watson.
Licensed under the MIT License (MIT), see
http://jedwatson.github.io/classnames
*/
/* global define */
(function () {
'use strict';
var classNames = (function () {
// don't inherit from Object so we can skip hasOwnProperty check later
// http://stackoverflow.com/questions/15518328/creating-js-object-with-object-createnull#answer-21079232
function StorageObject() {}
StorageObject.prototype = Object.create(null);
function _parseArray (resultSet, array) {
var length = array.length;
for (var i = 0; i < length; ++i) {
_parse(resultSet, array[i]);
}
}
var hasOwn = {}.hasOwnProperty;
function _parseNumber (resultSet, num) {
resultSet[num] = true;
}
function _parseObject (resultSet, object) {
for (var k in object) {
if (hasOwn.call(object, k)) {
// set value to false instead of deleting it to avoid changing object structure
// https://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/#de-referencing-misconceptions
resultSet[k] = !!object[k];
}
}
}
var SPACE = /\s+/;
function _parseString (resultSet, str) {
var array = str.split(SPACE);
var length = array.length;
for (var i = 0; i < length; ++i) {
resultSet[array[i]] = true;
}
}
function _parse (resultSet, arg) {
if (!arg) return;
var argType = typeof arg;
// 'foo bar'
if (argType === 'string') {
_parseString(resultSet, arg);
// ['foo', 'bar', ...]
} else if (Array.isArray(arg)) {
_parseArray(resultSet, arg);
// { 'foo': true, ... }
} else if (argType === 'object') {
_parseObject(resultSet, arg);
// '130'
} else if (argType === 'number') {
_parseNumber(resultSet, arg);
}
}
function _classNames () {
// don't leak arguments
// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#32-leaking-arguments
var len = arguments.length;
var args = Array(len);
for (var i = 0; i < len; i++) {
args[i] = arguments[i];
}
var classSet = new StorageObject();
_parseArray(classSet, args);
var list = [];
for (var k in classSet) {
if (classSet[k]) {
list.push(k)
}
}
return list.join(' ');
}
return _classNames;
})();
if (typeof module !== 'undefined' && module.exports) {
module.exports = classNames;
} else if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
// register as 'classnames', consistent with npm package name
define('classnames', [], function () {
return classNames;
});
} else {
window.classNames = classNames;
}
}());
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