Module "call"

Jan Burse, created Aug 24. 2020
* Context and pretty printing information of an atom can be accessed and
* modified by the predicates callable_property/2, set_callable_property/3
* and reset_callable_property/3.
* Example:
* ?- length(X, 0), callable_property(X, Y), writeq(Y), nl, fail; true.
* sys_context('/basic/lists.px')
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:- sys_callable_property_chk(here, sys_context/1, [sys_context(C)]),
set_source_property(C, use_package(foreign(jekpro/reference/reflect))).
:- sys_callable_property_chk(here, sys_context/1, [sys_context(C)]),
reset_source_property(C, sys_source_visible(public)).
* callable_property(C, Q):
* The predicate succeeds for the properties Q of the callable C.
% callable_property(+Callable, -Property)
sys_member(R, P).
functor(R, F, A),
sys_member(R, P).
:- set_predicate_property(callable_property/2, visible(public)).
:- special(sys_callable_property/2, 'SpecialCall', 0).
:- set_predicate_property(sys_callable_property/2, visible(private)).
% already defined in special.p
% :- special(sys_callable_property_chk/3, 'SpecialCall', 1).
% :- set_predicate_property(sys_callable_property_chk/3, visible(private)).
* set_callable_property(B, Q, A):
* The predicate succeeds for a new callable B which is a clone of
* the callable A except for the property Q which is now set.
% reset_callable_property(-Callable, +Property, +Callable)
:- special(set_callable_property/3, 'SpecialCall', 2).
:- set_predicate_property(set_callable_property/3, visible(public)).
* reset_callable_property(B, Q, A):
* The predicate succeeds for a new callable B which is a clone of
* the callable A except for the property Q which is now reset.
% reset_callable_property(-Callable, +Property, +Callable)
:- special(reset_callable_property/3, 'SpecialCall', 3).
:- set_predicate_property(reset_callable_property/3, visible(public)).