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Revision 4601, 0.7 KB
(checked in by pmoura, 7 weeks ago)
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Author Date Id Revision
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| 1 | |
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| 2 | :- object(depth_first(Bound), |
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| 3 | instantiates(blind_search(Bound))). |
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| 4 | |
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| 5 | |
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| 6 | :- info([ |
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| 7 | version is 1.2, |
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| 8 | author is 'Paulo Moura', |
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| 9 | date is 2008/6/9, |
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| 10 | comment is 'Depth first state space search strategy.', |
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| 11 | parnames is ['Bound']]). |
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| 12 | |
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| 13 | |
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| 14 | :- uses(list, [member/2, reverse/2]). |
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| 15 | |
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| 16 | |
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| 17 | search(Space, State, Bound, Solution) :- |
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| 18 | depth(Space, State, Bound, [], Path), |
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| 19 | reverse(Path, Solution). |
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| 20 | |
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| 21 | |
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| 22 | depth(Space, State, _, Path, [State| Path]) :- |
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| 23 | Space::goal_state(State). |
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| 24 | |
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| 25 | depth(Space, State, Bound, Path, Solution) :- |
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| 26 | Bound > 0, |
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| 27 | Space::next_state(State, Next), |
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| 28 | \+ Space::member_path(Next, [State| Path]), |
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| 29 | Bound2 is Bound - 1, |
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| 30 | depth(Space, Next, Bound2, [State| Path], Solution). |
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| 31 | |
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| 32 | |
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| 33 | :- end_object. |
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