Language/OS - Multiplatform Resource Library/LANGUAGE OS.iso/prolog/modprolg/mod-prol.lha/Prolog/modlib/src/$oldconsult.P

Text File | 1992-06-01 | 5KB | 134 lines

/************************************************************************
*                                    *
* The SB-Prolog System                            *
* Copyright SUNY at Stony Brook, 1986; University of Arizona, 1987    *
*                                    *
************************************************************************/

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/****************************************************************************
 *                                                                          *
 * This file has been changed by to include Modules Extensions              *
 * Changes by : Brian Paxton 1991/92                                        *
 * Last update : June 1992                                                  *
 *                                                                          *
 * Organisation : University of Edinburgh.                                  *
 * For : Departments of Computer Science and Artificial Intelligence        *
 *       Fourth Year Project.                                               *
 *                                                                          *
 ****************************************************************************/

/* $oldconsult.P */

/* $oldconsult(Filename) consults the named file for interpretation.
   The second (optional) parameter to consult is a list of options.
   A `v' means verbose. An `e' means expand macros.  `t' means put trace
   points on any untraced predicate in the file being consulted. `q'
   means do a "quick" consult.
    (Macros are clauses with ::-. They are evaluated, if possible,
    at compile time. They MUST be PURE Horn clauses)
   The third (optional) parameter is used to return a list of
   predicate/arity pairs that were defined by the consult. This list
   can be passed to trace/1 so that they can be traced.

   Modified to assert all clauses into the root module.
*/

$oldconsult_export([$oldconsult/1,$oldconsult/2,$oldconsult/3,
                    $oldconsult_list/1]).

% $oldconsult_use : $blist, $bio, $assert, $getclauses, $bmeta, $mac

$oldconsult(File) :- $oldconsult(File,[e]).

$oldconsult(File,Opts) :- not(not($oldconsult(File,Opts,_))).
                               /* side-effects only*/

$oldconsult(File,Opts,Predlist) :-
    $atomic(File) ->
         ($oldconsultable(File) ->
              ($getclauses(File,Clslist,Predlist),!,
              $macexp(Clslist,Opts,Nclslist),
              $oldconsult_s(File,Nclslist,Opts),
              $symtype('_$traced_preds'(_),Tr),
              (Tr > 0 -> $oldconsult_untrace(Predlist) ; true),
              ($memberchk(t,Opts) -> $oldconsult_trace(Predlist) ; true),
               !
             ) ;
        ($print('** No such file: '), $print(File), $nl)
         ) ;
         ($print('** Illegal filename '), $print(File),
          $print(' for oldconsult: filename must be atomic'), $nl
         ).

$oldconsultable(user).
$oldconsultable(File) :- exists(File).

$oldconsult_s(File,Clslist,Opts) :-
/*  Clslist is list of terms: pred(Pred,Arity,_,_,ClauseList)
    where Clauselist is a list of terms:
    fact(Fact,CpyFlagRest) or rule(Head,Body,CpyFlag,CpyFlagRest) */

    $member(pred(Pred,Arity,_,_,Clauselist),Clslist),
    $bldstr(Pred,Arity,Call),$oldconsult_abolish(Call),
    ($member(v,Opts)->
      $tab(15),$writename('including : '),$writename(Pred),
      $writename('/'),$writename(Arity),$nl
    ;
      true),
    $oldconsult_islist(Clauselist),
    $member(Factorrule,Clauselist),
    $oldconsult_assert(Factorrule),
    fail.
$oldconsult_s(_,_,_).

$oldconsult_islist([]) :- !.
$oldconsult_islist([_|Tail]) :- $oldconsult_islist(Tail).

$oldconsult_abolish(Goal) :- $buff_code(Goal,0,11,0).

$oldconsult_assert(fact(Fact,_)) :- $assert(Fact).
$oldconsult_assert(rule(Head,Body,_,_)) :- $assert((Head :- Body)).

$oldconsult_untrace([]).
$oldconsult_untrace(['/'(P,N)|Prest]) :-
    ('_$traced_preds'(P/N) ->
        ($retract('_$traced_preds'(P/N)), trace(P/N)) ;
        true
    ),
    $oldconsult_untrace(Prest).

$oldconsult_trace(L) :-
    $symtype('_$traced_preds'(_),N),
    (N > 0 -> $oldconsult_trace1(L) ; trace(L)).

$oldconsult_trace1([]).
$oldconsult_trace1([P|Prest]) :-
    ('_$traced_preds'(P) -> true ; trace(P)),
    $oldconsult_trace1(Prest).

$oldconsult_list([]).
$oldconsult_list([H|T]) :- $oldconsult_list1(H), $oldconsult_list(T).

$oldconsult_list1('-'(File)) :- !, $oldconsult(File).
$oldconsult_list1(File) :- $oldconsult(File).

/* ------------------------------ $oldconsult.P ---------------------------- */