/*!
 * classie - class helper functions
 * from bonzo https://github.com/ded/bonzo
 * 
 * classie.has( elem, 'my-class' ) -> true/false
 * classie.add( elem, 'my-new-class' )
 * classie.remove( elem, 'my-unwanted-class' )
 * classie.toggle( elem, 'my-class' )
 */

/*jshint browser: true, strict: true, undef: true */
/*global define: false */

(function (window) {

    'use strict';

    // class helper functions from bonzo https://github.com/ded/bonzo

    function classreg(classname) {
        return new regexp("(^|\\s+)" + classname + "(\\s+|$)");
    }

    // classlist support for class management
    // altho to be fair, the api sucks because it won't accept multiple classes at once
    var hasclass, addclass, removeclass;

    if ('classlist' in document.documentelement) {
        hasclass = function (elem, c) {
            return elem.classlist.contains(c);
        };
        addclass = function (elem, c) {
            elem.classlist.add(c);
        };
        removeclass = function (elem, c) {
            elem.classlist.remove(c);
        };
    }
    else {
        hasclass = function (elem, c) {
            return classreg(c).test(elem.classname);
        };
        addclass = function (elem, c) {
            if (!hasclass(elem, c)) {
                elem.classname = elem.classname + ' ' + c;
            }
        };
        removeclass = function (elem, c) {
            elem.classname = elem.classname.replace(classreg(c), ' ');
        };
    }

    function toggleclass(elem, c) {
        var fn = hasclass(elem, c) ? removeclass : addclass;
        fn(elem, c);
    }

    var classie = {
        // full names
        hasclass: hasclass,
        addclass: addclass,
        removeclass: removeclass,
        toggleclass: toggleclass,
        // short names
        has: hasclass,
        add: addclass,
        remove: removeclass,
        toggle: toggleclass
    };

    // transport
    if (typeof define === 'function' && define.amd) {
        // amd
        define(classie);
    } else {
        // browser global
        window.classie = classie;
    }

})(window);