var rdash = /\(([^)]*)\)/
var onDir = Anot.directive('on', {
  priority: 3000,
  init: function(binding) {
    var value = binding.expr
    binding.type = 'on'
    var eventType = binding.param.replace(/-\d+$/, '') // :on-mousemove-10
    if (typeof onDir[eventType + 'Hook'] === 'function') {
      onDir[eventType + 'Hook'](binding)
    }
    if (value.indexOf('(') > 0 && value.indexOf(')') > -1) {
      var matched = (value.match(rdash) || ['', ''])[1].trim()
      if (matched === '' || matched === '$event') {
        // aaa() aaa($event)当成aaa处理
        value = value.replace(rdash, '')
      }
    }
    binding.expr = value
  },
  update: function(callback) {
    var binding = this
    var elem = this.element
    callback = function(e) {
      var fn = binding.getter || noop
      return fn.apply(binding.args[0], binding.args.concat(e))
    }

    var eventType = binding.param.replace(/-\d+$/, '') // :on-mousemove-10
    if (eventType === 'scan') {
      callback.call(elem, {
        type: eventType
      })
    } else if (typeof binding.specialBind === 'function') {
      binding.specialBind(elem, callback)
    } else {
      var removeFn = Anot.bind(elem, eventType, callback)
    }
    binding.rollback = function() {
      if (typeof binding.specialUnbind === 'function') {
        binding.specialUnbind()
      } else {
        Anot.unbind(elem, eventType, removeFn)
      }
    }
  }
})