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22 lines
619 B
Prolog
22 lines
619 B
Prolog
-turing(Tape0, Tape) :-
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- perform(q0, [], Ls, Tape0, Rs),
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- reverse(Ls, Ls1),
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- append(Ls1, Rs, Tape).
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-
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-perform(qf, Ls, Ls, Rs, Rs) :- !.
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-perform(Q0, Ls0, Ls, Rs0, Rs) :-
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- symbol(Rs0, Sym, RsRest),
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- once(rule(Q0, Sym, Q1, NewSym, Action)),
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- action(Action, Ls0, Ls1, [NewSym|RsRest], Rs1),
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- perform(Q1, Ls1, Ls, Rs1, Rs).
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-
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-symbol([], b, []).
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-symbol([Sym|Rs], Sym, Rs).
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-
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-action(left, Ls0, Ls, Rs0, Rs) :- left(Ls0, Ls, Rs0, Rs).
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-action(stay, Ls, Ls, Rs, Rs).
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-action(right, Ls0, [Sym|Ls0], [Sym|Rs], Rs).
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-
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-left([], [], Rs0, [b|Rs0]).
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-left([L|Ls], Ls, Rs, [L|Rs]).
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