244 lines
6.8 KiB
Prolog
244 lines
6.8 KiB
Prolog
%% for builtins that are not part of the ISO standard.
|
|
%% must be loaded at the REPL with
|
|
|
|
%% ?- use_module(library(iso_ext)).
|
|
|
|
:- module(iso_ext, [bb_b_put/2,
|
|
bb_get/2,
|
|
bb_put/2,
|
|
call_cleanup/2,
|
|
call_with_inference_limit/3,
|
|
forall/2,
|
|
partial_string/1,
|
|
partial_string/3,
|
|
partial_string_tail/2,
|
|
setup_call_cleanup/3,
|
|
call_nth/2,
|
|
% variant/2,
|
|
copy_term_nat/2]).
|
|
|
|
:- use_module(library(error), [can_be/2,
|
|
domain_error/3,
|
|
instantiation_error/1,
|
|
type_error/3]).
|
|
|
|
:- use_module(library(lists), [maplist/3]).
|
|
|
|
:- meta_predicate(forall(0, 0)).
|
|
|
|
forall(Generate, Test) :-
|
|
\+ (Generate, \+ Test).
|
|
|
|
%% (non-)backtrackable global variables.
|
|
|
|
bb_put(Key, Value) :-
|
|
( atom(Key) ->
|
|
'$store_global_var'(Key, Value)
|
|
; type_error(atom, Key, bb_put/2)
|
|
).
|
|
|
|
%% backtrackable global variables.
|
|
|
|
bb_b_put(Key, Value) :-
|
|
( atom(Key) ->
|
|
'$store_backtrackable_global_var'(Key, Value)
|
|
; type_error(atom, Key, bb_b_put/2)
|
|
).
|
|
|
|
bb_get(Key, Value) :-
|
|
( atom(Key) ->
|
|
'$fetch_global_var'(Key, Value)
|
|
; type_error(atom, Key, bb_get/2)
|
|
).
|
|
|
|
|
|
% setup_call_cleanup.
|
|
|
|
:- meta_predicate(call_cleanup(0, 0)).
|
|
|
|
call_cleanup(G, C) :- setup_call_cleanup(true, G, C).
|
|
|
|
:- meta_predicate(setup_call_cleanup(0, 0, 0)).
|
|
|
|
setup_call_cleanup(S, G, C) :-
|
|
'$get_b_value'(B),
|
|
'$call'(S),
|
|
'$set_cp_by_default'(B),
|
|
'$get_current_block'(Bb),
|
|
( C = _:CC,
|
|
'$call_with_default_policy'(var(CC)) ->
|
|
instantiation_error(setup_call_cleanup/3)
|
|
; '$call_with_default_policy'(scc_helper(C, G, Bb))
|
|
).
|
|
|
|
:- meta_predicate(scc_helper(?,0,?)).
|
|
|
|
:- non_counted_backtracking scc_helper/3.
|
|
scc_helper(C, G, Bb) :-
|
|
'$get_cp'(Cp),
|
|
'$install_scc_cleaner'(C, NBb),
|
|
'$call'(G),
|
|
( '$check_cp'(Cp) ->
|
|
'$reset_block'(Bb),
|
|
'$call_with_default_policy'(run_cleaners_without_handling(Cp))
|
|
; '$call_with_default_policy'(true)
|
|
; '$reset_block'(NBb),
|
|
'$fail'
|
|
).
|
|
scc_helper(_, _, Bb) :-
|
|
'$reset_block'(Bb),
|
|
'$get_ball'(Ball),
|
|
'$erase_ball',
|
|
'$call_with_default_policy'(run_cleaners_with_handling),
|
|
'$call_with_default_policy'(throw(Ball)).
|
|
scc_helper(_, _, _) :-
|
|
'$get_cp'(Cp),
|
|
'$call_with_default_policy'(run_cleaners_without_handling(Cp)),
|
|
'$fail'.
|
|
|
|
:- non_counted_backtracking run_cleaners_with_handling/0.
|
|
run_cleaners_with_handling :-
|
|
'$get_scc_cleaner'(C),
|
|
'$get_level'(B),
|
|
'$call_with_default_policy'(catch(C, _, true)),
|
|
'$set_cp_by_default'(B),
|
|
'$call_with_default_policy'(run_cleaners_with_handling).
|
|
run_cleaners_with_handling :-
|
|
'$restore_cut_policy'.
|
|
|
|
:- non_counted_backtracking run_cleaners_without_handling/1.
|
|
run_cleaners_without_handling(Cp) :-
|
|
'$get_scc_cleaner'(C),
|
|
'$get_level'(B),
|
|
'$call'(C),
|
|
'$set_cp_by_default'(B),
|
|
'$call_with_default_policy'(run_cleaners_without_handling(Cp)).
|
|
run_cleaners_without_handling(Cp) :-
|
|
'$set_cp_by_default'(Cp),
|
|
'$restore_cut_policy'.
|
|
|
|
% call_with_inference_limit
|
|
|
|
:- non_counted_backtracking end_block/4.
|
|
end_block(_, Bb, NBb, _L) :-
|
|
'$clean_up_block'(NBb),
|
|
'$reset_block'(Bb).
|
|
end_block(B, _Bb, NBb, L) :-
|
|
'$install_inference_counter'(B, L, _),
|
|
'$reset_block'(NBb),
|
|
'$fail'.
|
|
|
|
:- non_counted_backtracking handle_ile/3.
|
|
handle_ile(B, inference_limit_exceeded(B), inference_limit_exceeded) :- !.
|
|
handle_ile(B, E, _) :-
|
|
'$remove_call_policy_check'(B),
|
|
'$call_with_default_policy'(throw(E)).
|
|
|
|
:- meta_predicate(call_with_inference_limit(0, ?, ?)).
|
|
|
|
call_with_inference_limit(G, L, R) :-
|
|
( integer(L) ->
|
|
( L < 0 ->
|
|
domain_error(not_less_than_zero, L, call_with_inference_limit/3)
|
|
; true
|
|
)
|
|
; var(L) ->
|
|
instantiation_error(call_with_inference_limit/3)
|
|
; type_error(integer, L, call_with_inference_limit/3)
|
|
),
|
|
'$get_current_block'(Bb),
|
|
'$get_b_value'(B),
|
|
'$call_with_default_policy'(call_with_inference_limit(G, L, R, Bb, B)),
|
|
'$remove_call_policy_check'(B).
|
|
|
|
install_inference_counter(B, L, Count0) :-
|
|
'$install_inference_counter'(B, L, Count0).
|
|
|
|
:- meta_predicate(call_with_inference_limit(0,?,?,?,?)).
|
|
|
|
:- non_counted_backtracking call_with_inference_limit/5.
|
|
|
|
call_with_inference_limit(G, L, R, Bb, B) :-
|
|
'$install_new_block'(NBb),
|
|
'$install_inference_counter'(B, L, Count0),
|
|
'$call'(G),
|
|
'$inference_level'(R, B),
|
|
'$remove_inference_counter'(B, Count1),
|
|
'$call_with_default_policy'(is(Diff, L - (Count1 - Count0))),
|
|
'$call_with_default_policy'(end_block(B, Bb, NBb, Diff)).
|
|
call_with_inference_limit(_, _, R, Bb, B) :-
|
|
'$reset_block'(Bb),
|
|
'$remove_inference_counter'(B, _),
|
|
( '$get_ball'(Ball),
|
|
'$get_level'(Cp),
|
|
'$set_cp_by_default'(Cp)
|
|
; '$remove_call_policy_check'(B),
|
|
'$fail'
|
|
),
|
|
'$erase_ball',
|
|
'$call_with_default_policy'(handle_ile(B, Ball, R)).
|
|
|
|
partial_string(String, L, L0) :-
|
|
( String == [] ->
|
|
L = L0
|
|
; catch(atom_chars(Atom, String),
|
|
error(E, _),
|
|
throw(error(E, partial_string/3))),
|
|
'$create_partial_string'(Atom, L, L0)
|
|
).
|
|
|
|
partial_string(String) :-
|
|
'$is_partial_string'(String).
|
|
|
|
partial_string_tail(String, Tail) :-
|
|
( partial_string(String) ->
|
|
'$partial_string_tail'(String, Tail)
|
|
; throw(error(type_error(partial_string, String), partial_string_tail/2))
|
|
).
|
|
|
|
:- dynamic(i_call_nth_nesting/2).
|
|
:- dynamic(i_call_nth_counter/1).
|
|
|
|
:- meta_predicate(call_nth(0, ?)).
|
|
|
|
call_nth(Goal, N) :-
|
|
can_be(integer, N),
|
|
( integer(N) ->
|
|
( N < 0 ->
|
|
domain_error(not_less_than_zero, N, call_nth/2)
|
|
; N > 0
|
|
)
|
|
; true
|
|
),
|
|
setup_call_cleanup(call_nth_nesting(C, ID),
|
|
( Goal,
|
|
bb_get(ID, N0),
|
|
N1 is N0 + 1,
|
|
bb_put(ID, N1),
|
|
( integer(N) ->
|
|
N = N1,
|
|
!
|
|
; N = N1
|
|
)
|
|
),
|
|
( bb_get(i_call_nth_counter, C) ->
|
|
C1 is C - 1,
|
|
bb_put(i_call_nth_counter, C1)
|
|
; true
|
|
)).
|
|
|
|
call_nth_nesting(C, ID) :-
|
|
( bb_get(i_call_nth_counter, C0) ->
|
|
C is C0 + 1
|
|
; C = 0
|
|
),
|
|
number_chars(C, Cs),
|
|
atom_chars(Atom, Cs),
|
|
atom_concat(i_call_nth_nesting_, Atom, ID),
|
|
bb_put(ID, 0),
|
|
bb_put(i_call_nth_counter, C).
|
|
|
|
|
|
copy_term_nat(Source, Dest) :-
|
|
'$copy_term_without_attr_vars'(Source, Dest).
|