97 lines
1.6 KiB
Plaintext
97 lines
1.6 KiB
Plaintext
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:- object(state_space,
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instantiates(class),
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specializes(object)).
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:- info([
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version is 1.0,
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authors is 'Paulo Moura',
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date is 1998/3/23,
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comment is 'State space description predicates.']).
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:- public(initial_state/1).
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:- mode(initial_state(?nonvar), one_or_more).
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:- info(initial_state/1,
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[comment is 'Initial state.',
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argnames is ['State']]).
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:- public(initial_state/2).
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:- mode(initial_state(?atom, ?nonvar), zero_or_more).
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:- info(initial_state/2,
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[comment is 'Named initial state.',
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argnames is ['Name', 'State']]).
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:- public(next_state/2).
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:- mode(next_state(+nonvar, -nonvar), zero_or_more).
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:- info(next_state/2,
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[comment is 'Generates a state sucessor.',
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argnames is ['State', 'Next']]).
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:- public(goal_state/1).
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:- mode(goal_state(?nonvar), one_or_more).
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:- info(goal_state/1,
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[comment is 'Goal state.',
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argnames is ['State']]).
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:- public(goal_state/2).
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:- mode(goal_state(?atom, ?nonvar), zero_or_more).
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:- info(goal_state/2,
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[comment is 'Named goal state.',
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argnames is ['Name', 'State']]).
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:- public(print_state/1).
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:- mode(print_state(+nonvar), one).
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:- info(print_state/1,
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[comment is 'Pretty print state.',
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argnames is ['State']]).
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:- public(print_path/1).
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:- mode(print_path(+list), one).
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:- info(print_path/1,
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[comment is 'Pretty print a path (list of states).',
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argnames is ['Path']]).
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initial_state(State) :-
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::initial_state(_, State).
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goal_state(State) :-
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::goal_state(_, State).
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print_state(State) :-
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writeq(State), nl.
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print_path([]).
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print_path([State| States]) :-
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::print_state(State),
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print_path(States).
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:- end_object.
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