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yap-6.3/pl/listing.yap
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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

164 lines
4.1 KiB
Prolog

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: listing.pl *
* Last rev: *
* mods: *
* comments: listing a prolog program *
* *
*************************************************************************/
/* listing : Listing clauses in the database
*/
listing :-
current_predicate(_,Pred),
'$list_clauses'(Pred).
listing.
listing(V) :- var(V), !. % ignore variables
listing(M:V) :- !,
'$mod_switch'(M,listing(V)).
listing([]) :- !.
listing([X|Rest]) :-
!,
listing(X),
listing(Rest).
listing(X) :-
'$funcspec'(X,Name,Arity),
current_predicate(Name,Pred),
functor(Pred,Name,Arity),
'$list_clauses'(Pred).
listing(_).
'$funcspec'(Name/Arity,Name,Arity) :- !, atom(Name).
'$funcspec'(Name,Name,_) :- atom(Name), !.
'$funcspec'(Name,_,_) :- write('! Invalid procedure specification : '),
write(Name), nl.
'$list_clauses'(Pred) :-
( '$recordedp'(Pred,_,_) -> nl ),
fail.
'$list_clauses'(Pred) :-
'$recordedp'(Pred,(Pred:-Body),_),
'$beautify_vars'((Pred:-Body)),
'$write_clause'(Pred,Body),
fail.
portray_clause((Pred:-Body)) :- !,
'$beautify_vars'((Pred:-Body)),
'$write_clause'(Pred,Body).
portray_clause(Pred) :-
'$beautify_vars'((Pred:-true)),
'$write_clause'(Pred,true).
'$write_clause'(Head,Body) :-
writeq(Head),
( Body = true ;
tab(1), write((:-)),
'$write_body'(Body,3,',')
),
put("."), nl,
!.
'$write_body'(X,I,T) :- var(X), !, '$beforelit'(T,I), writeq('_').
'$write_body'((P,Q), IO, T) :-
!,
'$write_body'(P,IO,T),
put(","),
'$aftercomma'(T,IO,I),
'$write_body'(Q,I,',').
'$write_body'((P->Q;S),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put("-"), put(">"),
'$write_body'(Q,I,'->'),
put(";"),
'$write_body'(S,I,';'),
tab(1), put(")").
'$write_body'((P->Q|S),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put("-"), put(">"),
'$write_body'(Q,I,'->'),
put("|"),
'$write_body'(S,I,'|'),
tab(1), put(")").
'$write_body'((P->Q),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put("-"), put(">"),
'$write_body'(Q,I,'->'),
tab(1), put(")").
'$write_body'((P;Q),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put(";"),
'$write_body'(Q,I,';'),
tab(1), put(")").
'$write_body'((P;Q),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put(";"),
'$write_body'(Q,I,';'),
tab(1), put(")").
'$write_body'((P|Q),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put("|"),
'$write_body'(Q,I,'|'),
tab(1), put(")").
'$write_body'((P|Q),I,T) :-
!,
nl, tab(I-2), put("("),
'$write_body'(P,I,'('),
put("|"),
'$write_body'(Q,I,'|'),
tab(1), put(")").
'$write_body'(X,I,T) :-
'$beforelit'(T,I),
writeq(X).
'$aftercomma'(',',I,I) :- !.
'$aftercomma'(_,I0,I) :- I is I0+3.
'$beforelit'('(',_) :- !, tab(1).
'$beforelit'(_,I) :- nl, tab(I).
'$beautify_vars'(T) :-
'$list_get_vars'(T,[],L),
msort(L,SL),
'$list_transform'(SL,0).
'$list_get_vars'(V,L,[V|L] ) :- var(V), !.
'$list_get_vars'(Atomic, M, M) :-
primitive(Atomic), !.
'$list_get_vars'([Arg|Args], M, N) :- !,
'$list_get_vars'(Arg, M, K),
'$list_get_vars'(Args, K, N).
'$list_get_vars'(Term, M, N) :-
Term =.. [_|Args],
'$list_get_vars'(Args, M, N).
'$list_transform'([],_) :- !.
'$list_transform'([X,Y|L],M) :- X == Y, X = '$VAR'(M), !, N is M+1,
'$list_transform'(L,N).
'$list_transform'('$VAR'(-1).L,M) :- !, '$list_transform'(L,M).
'$list_transform'(X.L,M) :- '$list_transform'(L,M).