186 lines
4.9 KiB
Prolog
186 lines
4.9 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: listing.pl *
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* Last rev: *
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* mods: *
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* comments: listing a prolog program *
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* *
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*************************************************************************/
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/* listing : Listing clauses in the database
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*/
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listing :-
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current_output(Stream),
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'$current_module'(Mod),
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'$current_predicate_no_modules'(Mod,_,Pred),
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'$list_clauses'(Stream,Mod,Pred).
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listing.
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listing(V) :-
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current_output(Stream),
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'$current_module'(M),
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'$listing'(V,M,Stream).
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'$listing'(V,Mod,Stream) :- var(V), !,
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'$current_predicate_no_modules'(Mod,_,Pred),
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'$list_clauses'(Stream,Mod,Pred).
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'$listing'(M:V,_,Stream) :- !,
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'$listing'(V,M,Stream).
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'$listing'([],_,_) :- !.
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'$listing'([X|Rest], M, Stream) :-
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!,
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'$listing'(X, M, Stream),
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'$listing'(Rest, M, Stream).
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'$listing'(X, M, Stream) :-
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'$funcspec'(X,Name,Arity),
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'$current_predicate_no_modules'(M,Name,Pred),
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functor(Pred,Name,Arity),
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'$list_clauses'(Stream,M,Pred).
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'$listing'(_,_,_).
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'$funcspec'(Name/Arity,Name,Arity) :- !, atom(Name).
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'$funcspec'(Name,Name,_) :- atom(Name), !.
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'$funcspec'(Name,_,_) :-
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'$do_error'(domain_error(predicate_spec,Name),listing(Name)).
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'$list_clauses'(Stream, M, Pred) :-
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'$flags'(Pred,M,Flags,Flags),
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% has to be dynamic, source, or log update.
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Flags /\ 0x08402000 =\= 0,
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'$clause'(Pred, M, Body, _),
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'$portray_clause'(Stream,(Pred:-Body)),
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fail.
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portray_clause(Stream, Clause) :-
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copy_term_nat(Clause, CopiedClause),
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'$portray_clause'(Stream, CopiedClause),
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fail.
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portray_clause(_, _).
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portray_clause(Clause) :-
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current_output(Stream),
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copy_term_nat(Clause, CopiedClause),
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'$portray_clause'(Stream, CopiedClause),
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fail.
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portray_clause(_).
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'$portray_clause'(Stream, (Pred :- true)) :- !,
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'$beautify_vars'(Pred),
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writeq(Stream, Pred),
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format(Stream, '.~n', []).
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'$portray_clause'(Stream, (Pred:-Body)) :- !,
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'$beautify_vars'((Pred:-Body)),
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writeq(Stream, Pred),
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format(Stream, ' :-', []),
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'$write_body'(Body, 3, ',', Stream),
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format(Stream, '.~n', []).
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'$portray_clause'(Stream, Pred) :- !,
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'$beautify_vars'(Pred),
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writeq(Stream, Pred),
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format(Stream, '.~n', []).
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'$write_body'(X,I,T,Stream) :- var(X), !,
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'$beforelit'(T,I,Stream),
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writeq(Stream, '_').
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'$write_body'((P,Q), I, T, Stream) :-
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!,
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'$write_body'(P,I,T, Stream),
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put(Stream, 0',),
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'$write_body'(Q,I,',',Stream).
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'$write_body'((P->Q;S),I,_, Stream) :-
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!,
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format(Stream, '~n~*c(',[I,0' ]),
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I1 is I+2,
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'$write_body'(P,I1,'(',Stream),
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format(Stream, ' ->',[]),
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'$write_disj'((Q;S),I,I1,'->',Stream),
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format(Stream, '~n~*c)',[I,0' ]).
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'$write_body'((P->Q|S),I,_,Stream) :-
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!,
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format(Stream, '~n~*c(',[I,0' ]),
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I1 is I+2,
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'$write_body'(P,I,'(',Stream),
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format(Stream, ' ->',[]),
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'$write_disj'((Q|S),I,I1,'->',Stream),
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format(Stream, '~n~*c)',[I,0' ]).
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'$write_body'((P->Q),I,_,Stream) :-
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!,
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format(Stream, '~n~*c(',[I,0' ]),
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I1 is I+2,
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'$write_body'(P,I1,'(',Stream),
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format(Stream, ' ->',[]),
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'$write_body'(Q,I1,'->',Stream),
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format(Stream, '~n~*c)',[I,0' ]).
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'$write_body'((P;Q),I,_,Stream) :-
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!,
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format(Stream, '~n~*c(',[I,0' ]),
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I1 is I+2,
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'$write_disj'((P;Q),I,I1,'->',Stream),
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format(Stream, '~n~*c)',[I,0' ]).
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'$write_body'((P|Q),I,_,Stream) :-
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!,
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format(Stream, '~n~*c(',[I,0' ]),
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I1 is I+2,
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'$write_disj'((P|Q),I,I1,'->',Stream),
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format(Stream, '~n~*c)',[I,0' ]).
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'$write_body'(X,I,T,Stream) :-
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'$beforelit'(T,I,Stream),
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writeq(Stream,X).
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'$write_disj'((Q;S),I0,I,C,Stream) :- !,
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'$write_body'(Q,I,C,Stream),
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format(Stream, '~n~*c;',[I0,0' ]),
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'$write_disj'(S,I0,I,';',Stream).
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'$write_disj'((Q|S),I0,I,C,Stream) :- !,
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'$write_body'(Q,I,C,Stream),
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format(Stream, '~n~*c|',[I0,0' ]),
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'$write_disj'(S,I0,I,'|',Stream).
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'$write_disj'(S,_,I,C,Stream) :-
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'$write_body'(S,I,C,Stream).
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'$beforelit'('(',_,Stream) :- !, format(Stream,' ',[]).
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'$beforelit'(_,I,Stream) :- format(Stream,'~n~*c',[I,0' ]).
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'$beautify_vars'(T) :-
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'$list_get_vars'(T,[],L),
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msort(L,SL),
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'$list_transform'(SL,0).
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'$list_get_vars'(V,L,[V|L] ) :- var(V), !.
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'$list_get_vars'(Atomic, M, M) :-
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primitive(Atomic), !.
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'$list_get_vars'([Arg|Args], M, N) :- !,
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'$list_get_vars'(Arg, M, K),
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'$list_get_vars'(Args, K, N).
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'$list_get_vars'(Term, M, N) :-
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Term =.. [_|Args],
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'$list_get_vars'(Args, M, N).
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'$list_transform'([],_) :- !.
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'$list_transform'([X,Y|L],M) :-
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X == Y,
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X = '$VAR'(M),
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!,
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N is M+1,
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'$list_transform'(L,N).
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'$list_transform'('$VAR'(-1).L,M) :- !,
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'$list_transform'(L,M).
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'$list_transform'(_.L,M) :-
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'$list_transform'(L,M).
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