rishi/scryer-prolog
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FIXED: make occurs_check and answer_write_options flags discoverable

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Quoting from 7.11 Flags:

   NOTE - A built-in predicate current_prolog_flag(Flag, Value)
   (8.17.2) enables a program to discover all the flags supported
   by a processor and their current values.
This commit is contained in:
Markus Triska
2023-09-04 00:49:40 +02:00
parent 99bd3d3b1a
commit aca0de06cd
1 changed files with 10 additions and 3 deletions
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13
src/lib/builtins.pl
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@@ -161,12 +161,14 @@ current_prolog_flag(Flag, OccursCheckEnabled) :-
Flag == occurs_check, Flag == occurs_check,
!, !,
'$is_sto_enabled'(OccursCheckEnabled). '$is_sto_enabled'(OccursCheckEnabled).
current_prolog_flag(occurs_check, OccursCheckEnabled) :-
'$is_sto_enabled'(OccursCheckEnabled).
current_prolog_flag(Flag, Value) :- current_prolog_flag(Flag, Value) :-
Flag == answer_write_options, Flag == answer_write_options,
!, !,
( iso_ext:bb_get('$answer_write_options', Value) -> true answer_write_options(Value).
; Value = [] current_prolog_flag(answer_write_options, Value) :-
). answer_write_options(Value).
current_prolog_flag(Flag, _) :- current_prolog_flag(Flag, _) :-
atom(Flag), atom(Flag),
throw(error(domain_error(prolog_flag, Flag), current_prolog_flag/2)). % 8.17.2.3 b throw(error(domain_error(prolog_flag, Flag), current_prolog_flag/2)). % 8.17.2.3 b
@@ -174,6 +176,11 @@ current_prolog_flag(Flag, _) :-
nonvar(Flag), nonvar(Flag),
throw(error(type_error(atom, Flag), current_prolog_flag/2)). % 8.17.2.3 a throw(error(type_error(atom, Flag), current_prolog_flag/2)). % 8.17.2.3 a
answer_write_options(Value) :-
( iso_ext:bb_get('$answer_write_options', Value) -> true
; Value = []
).
%% set_prolog_flag(Flag, Value). %% set_prolog_flag(Flag, Value).
% %
% Sets the internal value of the flag. To see the list of flags supported by Scryer Prolog, % Sets the internal value of the flag. To see the list of flags supported by Scryer Prolog,