parse trick

script.js

testCtrl.$inject = ['$scope'];
function testCtrl($scope) {
    $scope.foo = function() {
        console.log(arguments);
    }
}

testDirective.$inject = ['$parse'];
function testDirective($parse) {
    var directive = {
        restrict: 'E',
        link: link,
        scope: true
    };

    function link(scope, element, attrs) {
        function someCallback(locals) {
            return $parse(attrs.someCallback)(scope, locals);
        }

        element.click(function(){
            scope.$apply(function(){
                someCallback({element: 'bar', bar: 'baz'});
            });
        })
    }

    return directive;
}

template.html

<test-directive some-callback="foo(foo, bar)" ng-controller="testCtrl">Click me!</test-directive>