Update prolog samples

samples/Prolog/test-prolog.prolog

@@ -0,0 +1,12 @@
+-/* Prolog test file */
+ -male(john).
+ -male(peter).
+ -
+ -female(vick).
+ -female(christie).
+ -
+ -parents(john, peter, christie).
+ -parents(vick, peter, christie).
+ -
+ -/* X is a brother of Y */
+ -brother(X, Y) :- male(X), parents(X, F, M), parents(Y, F, M).

samples/Prolog/turing.pl

@@ -0,0 +1,21 @@
+-turing(Tape0, Tape) :-
+ -    perform(q0, [], Ls, Tape0, Rs),
+ -    reverse(Ls, Ls1),
+ -    append(Ls1, Rs, Tape).
+ -
+ -perform(qf, Ls, Ls, Rs, Rs) :- !.
+ -perform(Q0, Ls0, Ls, Rs0, Rs) :-
+ -    symbol(Rs0, Sym, RsRest),
+ -    once(rule(Q0, Sym, Q1, NewSym, Action)),
+ -    action(Action, Ls0, Ls1, [NewSym|RsRest], Rs1),
+ -    perform(Q1, Ls1, Ls, Rs1, Rs).
+ -
+ -symbol([], b, []).
+ -symbol([Sym|Rs], Sym, Rs).
+ -
+ -action(left, Ls0, Ls, Rs0, Rs) :- left(Ls0, Ls, Rs0, Rs).
+ -action(stay, Ls, Ls, Rs, Rs).
+ -action(right, Ls0, [Sym|Ls0], [Sym|Rs], Rs).
+ -
+ -left([], [], Rs0, [b|Rs0]).
+ -left([L|Ls], Ls, Rs, [L|Rs]).