| 1 | |
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| 2 | :- object(state_space, |
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| 3 | instantiates(class), |
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| 4 | specializes(object)). |
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| 5 | |
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| 6 | :- info([ |
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| 7 | version is 1.1, |
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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 'State space description predicates.']). |
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| 11 | |
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| 12 | :- public(initial_state/1). |
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| 13 | :- mode(initial_state(?nonvar), one_or_more). |
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| 14 | :- info(initial_state/1, |
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| 15 | [comment is 'Initial state.', |
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| 16 | argnames is ['State']]). |
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| 17 | |
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| 18 | :- public(initial_state/2). |
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| 19 | :- mode(initial_state(?atom, ?nonvar), zero_or_more). |
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| 20 | :- info(initial_state/2, |
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| 21 | [comment is 'Named initial state.', |
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| 22 | argnames is ['Name', 'State']]). |
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| 23 | |
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| 24 | :- public(next_state/2). |
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| 25 | :- mode(next_state(+nonvar, -nonvar), zero_or_more). |
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| 26 | :- info(next_state/2, |
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| 27 | [comment is 'Generates a state sucessor.', |
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| 28 | argnames is ['State', 'Next']]). |
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| 29 | |
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| 30 | :- public(goal_state/1). |
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| 31 | :- mode(goal_state(?nonvar), one_or_more). |
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| 32 | :- info(goal_state/1, |
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| 33 | [comment is 'Goal state.', |
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| 34 | argnames is ['State']]). |
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| 35 | |
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| 36 | :- public(goal_state/2). |
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| 37 | :- mode(goal_state(?atom, ?nonvar), zero_or_more). |
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| 38 | :- info(goal_state/2, |
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| 39 | [comment is 'Named goal state.', |
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| 40 | argnames is ['Name', 'State']]). |
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| 41 | |
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| 42 | :- public(member_path/2). |
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| 43 | :- mode(member_path(+nonvar, +list), zero_or_one). |
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| 44 | :- info(member_path/2, |
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| 45 | [comment is 'True if a state is member of a list of states.', |
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| 46 | argnames is ['State', 'Path']]). |
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| 47 | |
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| 48 | :- public(print_state/1). |
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| 49 | :- mode(print_state(+nonvar), one). |
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| 50 | :- info(print_state/1, |
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| 51 | [comment is 'Pretty print state.', |
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| 52 | argnames is ['State']]). |
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| 53 | |
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| 54 | :- public(print_path/1). |
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| 55 | :- mode(print_path(+list), one). |
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| 56 | :- info(print_path/1, |
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| 57 | [comment is 'Pretty print a path (list of states).', |
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| 58 | argnames is ['Path']]). |
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| 59 | |
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| 60 | initial_state(State) :- |
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| 61 | ::initial_state(_, State). |
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| 62 | |
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| 63 | goal_state(State) :- |
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| 64 | ::goal_state(_, State). |
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| 65 | |
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| 66 | print_state(State) :- |
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| 67 | writeq(State), nl. |
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| 68 | |
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| 69 | member_path(State, [State| _]) :- |
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| 70 | !. |
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| 71 | member_path(State, [_| Path]) :- |
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| 72 | member_path(State, Path). |
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| 73 | |
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| 74 | print_path([]). |
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| 75 | print_path([State| States]) :- |
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| 76 | ::print_state(State), |
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| 77 | print_path(States). |
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| 78 | |
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| 79 | :- end_object. |
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