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* Module dependencies.
*/
var index = require('./index-of')
/**
* Whitespace regexp.
*/
var re = /\s+/
/**
* toString reference.
*/
var toString = Object.prototype.toString
/**
* Wrap `el` in a `ClassList`.
*
* @param {Element} el
* @return {ClassList}
* @api public
*/
module.exports = function (el) {
return new ClassList(el)
}
/**
* Initialize a new ClassList for `el`.
*
* @param {Element} el
* @api private
*/
function ClassList(el) {
Iif (!el || !el.nodeType) {
throw new Error('A DOM element reference is required')
}
this.el = el
this.list = el.classList
}
/**
* Add class `name` if not already present.
*
* @param {String} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.add = function (name) {
// classList
Eif (this.list) {
this.list.add(name)
return this
}
// fallback
var arr = this.array()
var i = index(arr, name)
if (!~i) arr.push(name)
this.el.className = arr.join(' ')
return this
}
/**
* Remove class `name` when present, or
* pass a regular expression to remove
* any which match.
*
* @param {String|RegExp} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.remove = function (name) {
// classList
Eif (this.list) {
this.list.remove(name)
return this
}
// fallback
var arr = this.array()
var i = index(arr, name)
if (~i) arr.splice(i, 1)
this.el.className = arr.join(' ')
return this
}
/**
* Toggle class `name`, can force state via `force`.
*
* For browsers that support classList, but do not support `force` yet,
* the mistake will be detected and corrected.
*
* @param {String} name
* @param {Boolean} force
* @return {ClassList}
* @api public
*/
ClassList.prototype.toggle = function (name, force) {
// classList
Eif (this.list) {
Iif ('undefined' !== typeof force) {
if (force !== this.list.toggle(name, force)) {
this.list.toggle(name) // toggle again to correct
}
} else {
this.list.toggle(name)
}
return this
}
// fallback
if ('undefined' !== typeof force) {
if (!force) {
this.remove(name)
} else {
this.add(name)
}
} else {
if (this.has(name)) {
this.remove(name)
} else {
this.add(name)
}
}
return this
}
/**
* Return an array of classes.
*
* @return {Array}
* @api public
*/
ClassList.prototype.array = function () {
var className = this.el.getAttribute('class') || ''
var str = className.replace(/^\s+|\s+$/g, '')
var arr = str.split(re)
Iif ('' === arr[0]) arr.shift()
return arr
}
/**
* Check if class `name` is present.
*
* @param {String} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.has = ClassList.prototype.contains = function (name) {
return this.list ? this.list.contains(name) : !!~index(this.array(), name)
}
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