This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/Logtalk/examples/searching/depth_first1.lgt
pmoura 9f1b358c04 Logtalk 2.26.2 files.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1486 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2005-12-24 18:00:21 +00:00

34 lines
686 B
Plaintext

:- object(depth_first(Bound),
instantiates(blind_search(Bound))).
:- info([
version is 1.1,
author is 'Paulo Moura',
date is 2005/10/22,
comment is 'Depth first state space search strategy.',
parnames is ['Bound']]).
:- uses(list, [member/2, reverse/2]).
search(Space, State, Bound, Solution) :-
depth(Space, State, Bound, [], Path),
reverse(Path, Solution).
depth(Space, State, _, Path, [State| Path]) :-
Space::goal_state(State).
depth(Space, State, Bound, Path, Solution) :-
Bound > 0,
Space::next_state(State, Next),
\+ member(Next, [State| Path]),
Bound2 is Bound - 1,
depth(Space, Next, Bound2, [State| Path], Solution).
:- end_object.