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yap-6.3/CHR/chr/examples/monkey.pl
vsc e5f4633c39 This commit was generated by cvs2svn to compensate for changes in r4, 
which included commits to RCS files with non-trunk default branches.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@5 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2001-04-09 19:54:03 +00:00

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Prolog
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%
% Monkey and Bananas:
%
% Forward chaining rules via CHR.
% rules inspired from ftp://ftp.cs.unibo.it:/pub/gaspari/fw_rules/
% Quite fast because no dynamic predicates are used to
% represent the facts.
% The amount of code generated is substantial however.
% Not optimized
%
% 970213 Christian Holzbaur
:- use_module(library(chr)).
handler monkey.
constraints phys_object/7, monkey/3, goal/5, found/0.
% explaination of constraints is missing here
:- op(900,fy,not).
% There is no such fact ('not exists' in SQL)
not Fact :- find_constraint( Fact, _), !, fail.
not _.
testcase(1) :-
phys_object(bananas,9-9,light,ceiling,_,_,ok),
phys_object(couch,7-7,heavy,floor,_,low,_),
phys_object(ladder,4-3,light,floor,_,high,_),
phys_object(blanket,7-7,light,_,_,_,_),
phys_object(garbage_can,3-5,light,floor,_,low,_),
monkey(7-7,couch,blanket),
goal(active,holds,bananas,_,_).
rule(1) @
goal(active,on,floor,A,B),
monkey(D,E,F) <=>
E\==floor
|
write('Jump onto the floor'),
nl,
monkey(D,floor,F),
goal(satisfied,on,floor,A,B).
rule(2) @
monkey(A,floor,B) \
goal(active,on,floor,D,E) <=>
write('Monkey is already on floor'),
nl,
goal(satisfied,on,floor,D,E).
rule(3) @
phys_object(A,B,C,floor,D,E,F) \
goal(active,on,A,H,I),
monkey(B,K,nothing) <=>
K\==A
|
write('Climb onto '),
write(A),
nl,
monkey(B,A,nothing),
goal(satisfied,on,A,H,I).
rule(4) @
goal(active,on,A,B,C),
phys_object(A,E,F,G,H,I,J),
monkey(E,L,M) ==>
M\==nothing
|
write('Put '),
nl,
goal(active,holds,nothing,O,P).
rule(5) @
goal(active,on,A,B,C),
phys_object(A,E,F,floor,G,H,I),
monkey(K,L,M) ==>
K\==E
|
goal(active,at,nothing,O,E).
rule(6) @
phys_object(A,B,C,floor,D,E,F),
monkey(B,A,H) \
goal(active,on,A,J,K) <=>
write('Monkey is already on '),
write(A),
nl,
goal(satisfied,on,A,J,K).
rule(7) @
goal(active,holds,nothing,A,B),
monkey(D,E,F),
phys_object(F,H,I,J,K,L,M) <=>
F\==nothing
|
write('Drop '),
write(F),
nl,
goal(satisfied,holds,nothing,A,B),
monkey(D,E,nothing),
phys_object(F,H,I,floor,K,L,M).
rule(8) @
goal(active,holds,nothing,A,B),
monkey(D,E,nothing) ==>
write('Monkey is holding nothing'),
nl,
goal(satisfied,holds,nothing,A,B).
rule(9) @
phys_object(ladder,A,B,floor,C,D,E) \
goal(active,holds,G,H,I),
phys_object(G,A,light,ceiling,K,L,M),
monkey(O,ladder,nothing) <=>
not phys_object(Q,R,S,G,T,U,V)
|
write('Grab '),
write(G),
nl,
monkey(O,ladder,G),
phys_object(G,A,light,nothing,K,L,M),
goal(satisfied,holds,G,H,I).
rule(10) @
goal(active,holds,A,B,C),
phys_object(A,E,light,ceiling,F,G,H),
phys_object(ladder,E,J,floor,K,L,M),
monkey(O,P,Q) ==>
P\==ladder
|
goal(active,on,ladder,S,T).
rule(11) @
goal(active,holds,A,B,C),
phys_object(A,E,light,ceiling,F,G,H),
phys_object(ladder,J,K,L,M,N,O) ==>
J\==E,
not goal(active,at,ladder,Q,E)
|
goal(active,at,ladder,R,E).
rule(12) @
goal(active,holds,A,B,C),
phys_object(A,E,light,F,G,H,I),
monkey(E,floor,nothing) <=>
F\==ceiling,
not phys_object(L,M,N,A,O,P,Q)
|
write('Grab '),
write(A),
nl,
phys_object(A,E,light,nothing,G,H,I),
monkey(E,floor,A),
goal(satisfied,holds,A,B,C).
rule(13) @
goal(active,holds,A,B,C),
phys_object(A,E,light,F,G,H,I),
monkey(E,F,K) ==>
F\==ceiling,
F\==floor
|
goal(active,on,floor,M,N).
rule(14) @
goal(active,holds,A,B,C),
phys_object(A,E,light,F,G,H,I),
monkey(K,L,M) ==>
F\==ceiling,
K\==E,
not goal(active,at,nothing,O,P)
|
goal(active,at,nothing,Q,E).
rule(15) @
goal(active,holds,A,B,C),
phys_object(A,E,light,F,G,H,I),
monkey(E,K,L) ==>
L\==nothing,
L\==A,
not goal(active,holds,nothing,N,O)
|
goal(active,holds,nothing,P,Q).
rule(16) @
goal(active,at,A,B,C),
monkey(E,floor,A),
phys_object(A,G,H,I,J,K,L) <=>
E\==C
|
write('Move '),
write(A),
write(' to '),
write(C),
nl,
phys_object(A,C,H,I,J,K,L),
monkey(C,floor,A),
goal(satisfied,at,A,B,C).
rule(17) @
goal(active,at,A,B,C),
monkey(E,F,A),
phys_object(A,H,I,J,K,L,M) ==>
F\==floor,
H\==C,
not goal(active,on,floor,O,P)
|
goal(active,on,floor,Q,R).
rule(18) @
goal(active,at,A,B,C),
phys_object(A,E,light,F,G,H,I),
monkey(K,L,M) ==>
E\==C,
M\==A,
not goal(active,holds,A,O,P)
|
goal(active,holds,A,Q,R).
rule(19) @
phys_object(A,B,light,C,D,E,F) \
goal(active,at,A,H,B) <=>
write('The object '),
write(A),
write(' is already at '),
write(B),
nl,
goal(satisfied,at,A,H,B).
rule(20) @
goal(active,at,nothing,A,B),
monkey(B,floor,nothing) <=>
write('Walk to '),
write(B),
nl,
monkey(B,floor,nothing),
goal(satisfied,at,nothing,A,B).
rule(21) @
goal(active,at,nothing,A,B),
monkey(D,floor,E),
phys_object(E,G,H,I,J,K,L) <=>
D\==B
|
write('Walk to '),
write(B),
write(' carrying '),
write(E),
nl,
monkey(B,floor,E),
phys_object(E,B,H,I,J,K,L),
goal(satisfied,at,nothing,A,B).
rule(22) @
goal(active,at,nothing,A,B),
monkey(D,E,F) ==>
E\==floor,
D\==B
|
goal(active,on,floor,H,I).
rule(23) @
monkey(A,B,C) \
goal(active,at,nothing,E,A) <=>
write('Monkey is already at '),
write(A),
nl,
goal(satisfied,at,nothing,E,A).
rule(24) @
goal(satisfied,A,B,C,D) ==>
not goal(active,F,G,H,I),
not found
|
write('CONGRATULATIONS the goals are satisfied'),
nl,
found.
rule(25) @
goal(active,holds,A,B,C),
phys_object(A,E,light,nothing,F,G,H),
monkey(E,J,A) ==>
write('Object '),
write(A),
write(' is already being held'),
nl,
goal(satisfied,holds,A,B,C).
end_of_file.
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