conveyal/modeify

/**
 * Add class `name` if not already present.
 *
 * @param {String} name
 * @param {Element} el
 * @api public
 */

exports.add = function(name, el){
    el.classList.add(name)
}

/**
 * Remove `name` if present
 *
 * @param {String|RegExp} name
 * @param {Element} el
 * @api public
 */

exports.remove = function(name, el){
    if (name instanceof RegExp) {
        return exports.removeMatching(name, el)
    }
    el.classList.remove(name)
}

/**
 * Remove all classes matching `re`.
 *
 * @param {RegExp} re
 * @param {Element} el
 * @api public
 */

exports.removeMatching = function(re, el){
    var arr = exports.array(el)
    for (var i = 0; i < arr.length; i++) {
        if (re.test(arr[i])) el.classList.remove(arr[i])
    }
}

/**
 * Toggle class `name`.
 *
 * @param {String} name
 * @param {Element} el
 * @api public
 */

exports.toggle = function(name, el){
    el.classList.toggle(name)
}

/**
 * Return an array of classes.
 *
 * @param {Element} el
 * @return {Array}
 * @api public
 */

exports.array = function(el){
    return el.className.match(/([^\s]+)/g) || []
}

/**
 * Check if class `name` is present.
 *
 * @param {String} name
 * @param {Element} el
 * @api public
 */

exports.has =
exports.contains = function(name, el){
    return el.classList.contains(name)
}