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// whitespace regex to avoid creating every time
var re = /\s+/;
/**
* 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) {
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
if (this.list) {
this.list.add(name);
return this;
}
// fallback
var arr = this.array();
var i = arr.indexOf(name);
if (!~i) {
arr.push(name);
}
this.el.className = arr.join(' ');
return this;
};
/**
* Remove class `name` when present.
*
* @param {String} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.remove = function(name){
// classList
if (this.list) {
this.list.remove(name);
return this;
}
// fallback
var arr = this.array();
var i = arr.indexOf(name);
if (~i) {
arr.splice(i, 1);
}
this.el.className = arr.join(' ');
return this;
};
/**
* Toggle class `name`.
*
* @param {String} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.toggle = function(name){
// classList
if (this.list) {
this.list.toggle(name);
return this;
}
// fallback
if (this.has(name)) {
return this.remove(name);
}
return this.add(name);
};
/**
* Return an array of classes.
*
* @return {Array}
* @api public
*/
ClassList.prototype.array = function(){
var arr = this.el.className.split(re);
if ('' === arr[0]) {
arr.pop();
}
return arr;
};
/**
* Check if class `name` is present.
*
* @param {String} name
* @return {ClassList}
* @api public
*/
ClassList.prototype.has = function(name){
return this.list
? this.list.contains(name)
: !! ~this.array().indexOf(name);
};