89 lines
3.3 KiB
Prolog
89 lines
3.3 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: tabling.yap *
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* Last rev: 8/2/88 *
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* mods: *
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* comments: support tabling predicates *
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* *
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*************************************************************************/
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table(X) :- var(X), !,
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write(user_error, '[ Error: argument to table/1 should be a predicate ]'),
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nl(user_error),
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fail.
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table((A,B)) :- !, table(A), table(B).
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table(A/N) :- integer(N), atom(A), !,
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functor(T,A,N), $flags(T,F,F),
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(
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X is F /\ 8'000100, X =\= 0, !,
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write(user_error, '[ Warning: '),
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write(user_error, A/N),
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write(user_error, ' is already declared as table ]'),
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nl(user_error)
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;
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X is F /\ 8'170000, X =:= 0, !, $table(T)
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;
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write(user_error, '[ Error: '),
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write(user_error, A/N),
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write(user_error, ' cannot be declared as table ]'),
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nl(user_error),
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fail
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).
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table(X) :- write(user_error, '[ Error: '),
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write(user_error, X),
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write(user_error, ' is an invalid argument to table/1 ]'),
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nl(user_error),
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fail.
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show_trie(X) :- var(X), !,
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write(user_error, '[ Error: argument to trie/1 should be a predicate ]'),
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nl(user_error),
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fail.
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show_trie(A/N) :- integer(N), atom(A), !,
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functor(T,A,N), $flags(T,F,F),
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(
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X is F /\ 8'000100, X =\= 0, !, $show_trie(T,_)
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;
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write(user_error, '[ Error: '),
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write(user_error, A/N),
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write(user_error, ' is not declared as table ]'),
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nl(user_error),
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fail
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).
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show_trie(X) :- write(user_error, '[ Error: '),
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write(user_error, X),
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write(user_error, ' is an invalid argument to trie/1 ]'),
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nl(user_error),
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fail.
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abolish_trie(X) :- var(X), !,
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write(user_error, '[ Error: argument to abolish_trie/1 should be a predicate ]'),
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nl(user_error),
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fail.
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abolish_trie(A/N) :- integer(N), atom(A), !,
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functor(T,A,N), $flags(T,F,F),
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(
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X is F /\ 8'000100, X =\= 0, !, $abolish_trie(T)
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;
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write(user_error, '[ Error: '),
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write(user_error, A/N),
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write(user_error, ' is not declared as table ]'),
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nl(user_error),
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fail
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).
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abolish_trie(X) :- write(user_error, '[ Error: '),
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write(user_error, X),
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write(user_error, ' is an invalid argument to abolish_trie/1 ]'),
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nl(user_error),
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fail.
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