296 lines
7.5 KiB
Prolog
296 lines
7.5 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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:- system_module( '$_listing', [listing/0,
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listing/1,
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portray_clause/1,
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portray_clause/2], []).
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:- use_system_module( '$_errors', ['$do_error'/2]).
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:- use_system_module( '$_preds', ['$clause'/4,
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'$current_predicate_no_modules'/3]).
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/* listing : Listing clauses in the database
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*/
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/** @pred listing
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Lists in the current output stream all the clauses for which source code
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is available (these include all clauses for dynamic predicates and
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clauses for static predicates compiled when source mode was `on`).
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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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'$list_clauses'(Stream,Mod,Pred).
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listing.
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/** @pred listing(+ _P_)
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Lists predicate _P_ if its source code is available.
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*/
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listing(MV) :-
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current_output(Stream),
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listing(Stream, MV).
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listing(Stream, MV) :-
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'$mlisting'(Stream, MV, _).
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listing(Stream, []) :- !.
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listing(Stream, [MV|MVs]) :- !,
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listing(Stream, MV),
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listing(Stream, MVs).
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'$mlisting'(Stream, MV, M) :-
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( var(MV) -> MV = NA, '$do_listing'(Stream, M, NA)
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;
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atom(MV) -> MV/_ = NA, '$do_listing'(Stream, M, NA)
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;
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MV = N//Ar -> ( integer(Ar) -> Ar2 is Ar+2, NA is N/Ar2 ; '$do_listing'(Stream, Na/Ar2, M), Ar2 >= 2, Ar is Ar2-2 )
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;
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MV = N/Ar, ( atom(N) -> true ; var(N) ), ( integer(Ar) -> true ; var(A) ) -> '$do_listing'(Stream, M, MV)
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;
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MV = M1:PP -> '$mlisting'(Stream, PP, M1)
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;
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'$do_error'(type_error(predicate_indicator,MV),listing(Stream, MV) )
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).
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'$do_listing'(Stream, M, NA) :-
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( '$$current_predicate'(NA, M),
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'$listing'(NA,M,Stream),
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fail
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;
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true
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).
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'$listing'(X, M, Stream) :-
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'$funcspec'(X,Name,Arity),
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functor(Pred,Name,Arity),
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'$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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'$flags'(Pred,M,Flags,Flags),
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Flags /\ 0x48602000 =\= 0,
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nl(Stream),
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fail.
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'$list_clauses'(Stream, M, Pred) :-
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( '$is_dynamic'(Pred, M) -> true ; '$is_log_updatable'(Pred, M) ),
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functor( Pred, N, Ar ),
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'$current_module'(Mod),
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(
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M == Mod
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->
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format( Stream, ':- dynamic ~q/~d.~n', [N,Ar])
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;
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format( Stream, ':- dynamic ~q:~q/~d.~n', [M,N,Ar])
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),
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fail.
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'$list_clauses'(Stream, M, Pred) :-
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'$is_thread_local'(Pred, M),
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functor( Pred, N, Ar ),
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'$current_module'(Mod),
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(
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M == Mod
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->
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format( Stream, ':- thread_local ~q/~d.~n', [N,Ar])
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;
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format( Stream, ':- thread_local ~q:~q/~d.~n', [M,N,Ar])
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),
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fail.
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'$list_clauses'(Stream, M, Pred) :-
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'$is_multifile'(Pred, M),
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functor( Pred, N, Ar ),
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'$current_module'(Mod),
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(
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M == Mod
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->
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format( Stream, ':- multifile ~q/~d.~n', [N,Ar])
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;
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format( Stream, ':- multifile ~q:~q/~d.~n', [M,N,Ar])
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),
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fail.
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'$list_clauses'(Stream, M, Pred) :-
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'$is_metapredicate'(Pred, M),
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functor( Pred, Name, Arity ),
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prolog:'$meta_predicate'(Name,M,Arity,PredDef),
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'$current_module'(Mod),
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(
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M == Mod
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->
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format( Stream, ':- ~q.~n', [PredDef])
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;
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format( Stream, '~:- ~q:~q.~n', [M,PredDef])
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),
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fail.
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'$list_clauses'(Stream, M, Pred) :-
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nl( Stream ),
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fail.
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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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'$clause'(Pred, M, Body, _),
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'$current_module'(Mod),
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( M \= Mod -> H = M:Pred ; H = Pred ),
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'$portray_clause'(Stream,(H:-Body)),
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fail.
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/** @pred portray_clause(+ _S_,+ _C_)
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Write clause _C_ on stream _S_ as if written by listing/0.
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*/
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portray_clause(Stream, Clause) :-
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copy_term_nat(Clause, CopiedClause),
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'$portray_clause'(Stream, CopiedClause),
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fail.
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portray_clause(_, _).
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/** @pred portray_clause(+ _C_)
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Write clause _C_ as if written by listing/0.
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*/
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portray_clause(Clause) :-
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current_output(Stream),
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portray_clause(Stream, 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, '~n~*c->',[I,0' ]),
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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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'$write_body'(P,I,'(',Stream),
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format(Stream, '~n~*c->',[I,0' ]),
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'$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, '~n~*c->',[I,0' ]),
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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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