37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
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#const horizon=1.
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% Check feature requirements
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:- requires(feature(actionCosts)).
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:- requires(feature(axiomRules)).
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:- requires(feature(conditionalEffects)).
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% Horizon, must be defined externally
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time(0..horizon).
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% Establish initial state
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holds(Variable, Value, 0) :- initialState(Variable, Value).
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% Perform actions
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1 {occurs(Action, T) : action(Action)} 1 :- time(T), T > 0.
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% Check preconditions
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:- occurs(Action, T), precondition(Action, Variable, Value), not holds(Variable, Value, T - 1), time(T), time(T - 1).
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% Apply effects
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caused(Variable, Value, T) :- occurs(Action, T), postcondition(Action, _, Variable, Value).
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modified(Variable, T) :- caused(Variable, Value, T).
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holds(Variable, Value, T) :- caused(Variable, Value, T), time(T).
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holds(Variable, Value, T) :- holds(Variable, Value, T - 1), not modified(Variable, T), time(T), time(T - 1).
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% Check that variables have unique values
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:- variable(Variable), not 1 {holds(Variable, Value, T) : contains(Variable, Value)} 1, time(T).
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% Check mutexes
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:- mutexGroup(MutexGroup), not {holds(Variable, Value, T) : contains(MutexGroup, Variable, Value)} 1, time(T).
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% Verify that goal is met
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:- goal(Variable, Value), not holds(Variable, Value, horizon).
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#show occurs/2.
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