31 lines
699 B
Plaintext
31 lines
699 B
Plaintext
#include <incmode>.
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#program base.
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% Establish initial state
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holds(F, 0) :- initialState(F).
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#program step(t).
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% Perform actions
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1 {occurs(A, t) : action(A)} 1.
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% Check preconditions
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:- occurs(A, t), precondition(A, F, true), not holds(F, t - 1).
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:- occurs(A, t), precondition(A, F, false), holds(F, t - 1).
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% Apply effects
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holds(F, t) :- occurs(A, t), postcondition(A, F, true), action(A).
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deleted(F, t) :- occurs(A, t), postcondition(A, F, false), action(A).
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holds(F, t) :- holds(F, t - 1), not deleted(F, t).
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#program check(t).
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% Verify that goal is met
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:- query(t), goal(F, true), not holds(F, t).
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:- query(t), goal(F, false), holds(F, t).
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#show query/1.
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#show holds/2.
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#show occurs/2.
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