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a couple test scripts that translate Alloy into Z3 by hand

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Barak Michener 2020-08-08 14:08:57 -07:00
commit 68d8cd4089
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from z3 import *
Sig = DeclareSort("Sig")
Instance = DeclareSort("Instance")
Object = Const('Object', Sig)
Farmer, Fox, Chicken, Grain = Consts('Farmer Fox Chicken, Grain', Sig)
IsType = Function('IsType', Sig, Sig, BoolSort())
fp.register_relation(IsType)
fp = Fixedpoint()
fp.fact(IsType(Object, Object))
fp.fact(IsType(Farmer, Object))
fp.fact(IsType(Fox, Object))
fp.fact(IsType(Chicken, Object))
fp.fact(IsType(Grain, Object))
Eats = Function("Eats", Sig, Sig, BoolSort())
fp.register_relation(Eats)
def genEats(x, y):
fp.rule(Eats(x, y), IsType(x, Object), IsType(y, Object))
genEats(Fox, Chicken)
genEats(Chicken, Grain)
State = Const("State", Sig)
Near = Const("State::Near", Sig, Sig, BoolSort())
fp.register_relation(Near)
Far = Const("State::Far", Sig, Sig, BoolSort())
fp.register_relation(Far)
fp.rule(Near())