如何将Valloy虚拟功能代码转换为Alloy脚本？

Question

I am working on a project and found out an article about Valloy they give an example of a code both in Valloy and Alloy but the problem is that the syntax of the Alloy script is not recognised by the Alloy analyser. Exp :

fun Object::equals(obj: Object) {
this.class = Object_Class => this..Object_equals(obj)
this.class = Dimension_Class => this..Dimension_equals(obj)
this.class = Dimension3D_Class =>this..Dimension3D_equals(obj) } 

the analyser can't accept a function with no return type and does not know the ".." !! can any one help with this ?!!

Thank u in advance !!

Answer 1

That syntax is not standard Alloy. I'm not sure if VAlloy is still maintained or whether you can get it from the authors of that paper.