34 lines
675 B
Plaintext
34 lines
675 B
Plaintext
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:- object(depth_first(Bound),
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instantiates(blind_search(Bound))).
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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 'Depth first state space search strategy.',
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parnames is ['Bound']]).
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:- uses(list).
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search(Space, State, Bound, Solution) :-
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depth(Space, State, Bound, [], Path),
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list::reverse(Path, Solution).
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depth(Space, State, _, Path, [State| Path]) :-
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Space::goal_state(State).
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depth(Space, State, Bound, Path, Solution) :-
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Bound > 0,
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Space::next_state(State, Next),
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\+ list::member(Next, [State| Path]),
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Bound2 is Bound - 1,
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depth(Space, Next, Bound2, [State| Path], Solution).
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:- end_object.
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