109 lines
2.7 KiB
Prolog
109 lines
2.7 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: arrays.yap *
|
|
* Last rev: *
|
|
* mods: *
|
|
* comments: Array Manipulation *
|
|
* *
|
|
*************************************************************************/
|
|
|
|
/**
|
|
@addtogroup YAPArrays
|
|
*/
|
|
%
|
|
% These are the array built-in predicates. They will only work if
|
|
% YAP_ARRAYS is defined in Yap.h.m4.
|
|
%
|
|
|
|
/** @pred array(+ _Name_, + _Size_)
|
|
|
|
|
|
Creates a new dynamic array. The _Size_ must evaluate to an
|
|
integer. The _Name_ may be either an atom (named array) or an
|
|
unbound variable (anonymous array).
|
|
|
|
Dynamic arrays work as standard compound terms, hence space for the
|
|
array is recovered automatically on backtracking.
|
|
|
|
|
|
*/
|
|
array(Obj, Size) :-
|
|
'$create_array'(Obj, Size).
|
|
|
|
|
|
% arithmetical optimization
|
|
'$c_arrays'((P:-Q),(NP:-QF)) :- !,
|
|
'$c_arrays_body'(Q, QI),
|
|
'$c_arrays_head'(P, NP, QI, QF).
|
|
'$c_arrays'(P, NP) :-
|
|
'$c_arrays_fact'(P, NP).
|
|
|
|
'$c_arrays_body'(P, P) :-
|
|
var(P), !.
|
|
'$c_arrays_body'((P0,Q0), (P,Q)) :- !,
|
|
'$c_arrays_body'(P0, P),
|
|
'$c_arrays_body'(Q0, Q).
|
|
'$c_arrays_body'((P0;Q0), (P;Q)) :- !,
|
|
'$c_arrays_body'(P0, P),
|
|
'$c_arrays_body'(Q0, Q).
|
|
'$c_arrays_body'((P0->Q0), (P->Q)) :- !,
|
|
'$c_arrays_body'(P0, P),
|
|
'$c_arrays_body'(Q0, Q).
|
|
'$c_arrays_body'(P, NP) :- '$c_arrays_lit'(P, NP).
|
|
|
|
%
|
|
% replace references to arrays to references to built-ins.
|
|
%
|
|
'$c_arrays_lit'(G, GL) :-
|
|
'$array_references'(G, NG, VL),
|
|
'$add_array_entries'(VL, NG, GL).
|
|
|
|
'$c_arrays_head'(G, NG, B, NB) :-
|
|
'$array_references'(G, NG, VL),
|
|
'$add_array_entries'(VL, B, NB).
|
|
|
|
'$c_arrays_fact'(G, NG) :-
|
|
'$array_references'(G, IG, VL),
|
|
(VL = [] -> NG = G;
|
|
NG = (IG :- NB), '$add_array_entries'(VL, true, NB)).
|
|
|
|
'$add_array_entries'([], NG, NG).
|
|
'$add_array_entries'([Head|Tail], G, (Head, NG)) :-
|
|
'$add_array_entries'(Tail, G, NG).
|
|
|
|
|
|
/** @pred static_array_properties(? _Name_, ? _Size_, ? _Type_)
|
|
|
|
|
|
Show the properties size and type of a static array with name
|
|
_Name_. Can also be used to enumerate all current
|
|
static arrays.
|
|
|
|
This built-in will silently fail if the there is no static array with
|
|
that name.
|
|
|
|
|
|
*/
|
|
static_array_properties(Name, Size, Type) :-
|
|
atom(Name), !,
|
|
'$static_array_properties'(Name, Size, Type).
|
|
static_array_properties(Name, Size, Type) :-
|
|
var(Name), !,
|
|
current_atom(Name),
|
|
'$static_array_properties'(Name, Size, Type).
|
|
static_array_properties(Name, Size, Type) :-
|
|
'$do_error'(type_error(atom,Name),static_array_properties(Name,Size,Type)).
|
|
|
|
|
|
|
|
|
|
|