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- include "primitives.alh"
- include "modelling.alh"
- include "object_operations.alh"
- Boolean function main(model : Element):
- Element transitions
- Element links
- String transition
- String link
- String place
- Boolean enabled
- transitions = allInstances(model, "PetriNet/Transition")
- // Iterate over all transitions
- while (set_len(transitions) > 0):
- // Check if it is enabled
- transition = set_pop(transitions)
- // Check all incoming P2T links
- links = allIncomingAssociationInstances(model, transition, "PetriNet/P2T")
- enabled = True
- while (set_len(links) > 0):
- link = set_pop(links)
- if (cast_integer(read_attribute(model, link, "weight")) > cast_integer(read_attribute(model, readAssociationSource(model, link), "tokens"))):
- // Too few tokens, so skip
- enabled = False
- break!
- if (enabled):
- // All checks OK, so update the out locations
- links = allOutgoingAssociationInstances(model, transition, "PetriNet/T2P")
- while (set_len(links) > 0):
- link = set_pop(links)
- place = readAssociationDestination(model, link)
- instantiate_attribute(model, place, "tokens", cast_integer(read_attribute(model, place, "tokens")) + cast_integer(read_attribute(model, link, "weight")))
- // All checks OK, and update the in locations
- links = allOutgoingAssociationInstances(model, transition, "PetriNet/P2T")
- while (set_len(links) > 0):
- link = set_pop(links)
- place = readAssociationSource(model, link)
- instantiate_attribute(model, place, "tokens", cast_integer(read_attribute(model, place, "tokens")) - cast_integer(read_attribute(model, link, "weight")))
- return True!
- return False!
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