import models/SimpleClassDiagrams as SCD
include "primitives.alh"

SCD PetriNets{
    SimpleAttribute Natural {
        constraint =
            $
            include "primitives.alh"

            String function constraint_Natural(model : Element, name : String):
                Element self
                self = model["model"][name]
                if (is_physical_int(self)):
                    if (integer_gte(self, 0)):
                        return "OK"!
                    else:
                        return "Natural number not larger than or equal to zero"!
                else:
                    return "Natural number not larger than or equal to zero"!
            $
    }
    Class Place{
        tokens : Natural
    }
    Class Transition{}
    Association P2T (Place, Transition) {
        weight : Natural
    }
    Association T2P (Transition, Place) {
        weight : Natural
    }
}

PetriNets my_petrinet {
    Place p1 {
        tokens = 1
    }
    Place p2 {
        tokens = 3
    }
    Transition t1 {}
    P2T (p1, t1) {
        weight = 1
    }
    T2P (t1, p2) {
        weight = 2
    }
}

export my_petrinet to models/my_petrinet