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copy attribute list in get_atts

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This commit is contained in:
Mark Thom
2019-02-03 16:10:12 -07:00
parent 3cfbbb23a3
commit 8a3a79de3c
3 changed files with 24 additions and 20 deletions
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18
src/prolog/lib/atts.pl
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@@ -1,6 +1,7 @@
:- module(atts, [attribute/1, '$absent_attr'/2, '$get_attr'/2, '$put_attr'/2,
'$absent_from_list'/2, '$get_from_list'/2, '$add_to_list'/2,
'$del_attr'/3, '$del_attr_step'/2, '$del_attr_buried'/3]).
:- module(atts, [attribute/1, '$absent_attr'/2, '$copy_attr_list'/2,
'$get_attr'/2, '$put_attr'/2, '$absent_from_list'/2,
'$get_from_list'/2, '$add_to_list'/2, '$del_attr'/3,
'$del_attr_step'/2, '$del_attr_buried'/3]).
:- use_module(library(control)).
:- use_module(library(dcgs)).
@@ -60,6 +61,10 @@
).
'$del_attr_buried'(_, _, _).
'$copy_attr_list'(L, []) :- var(L), !.
'$copy_attr_list'([Att|Atts], [Att|CopiedAtts]) :-
'$copy_attr_list'(Atts, CopiedAtts).
user:term_expansion(Term0, Terms) :-
nonvar(Term0),
Term0 = (:- attribute Atts),
@@ -75,13 +80,14 @@ put_attrs_var_check -->
(put_atts(Var, Attr) :- var(Attr), throw(error(instantiation_error, put_atts/2)))].
get_attrs_var_check -->
{ numbervars([Var, Attr], 0, _) },
{ numbervars([Var, Ls, Attr], 0, _) },
[(get_atts(Var, Attr) :- nonvar(Var), throw(error(type_error(variable, Var), get_atts/2))),
(get_atts(Var, Attr) :- var(Attr), !, '$get_attr_list'(Var, Attr))].
(get_atts(Var, Attr) :- var(Attr), !, '$get_attr_list'(Var, Ls), nonvar(Ls),
'$copy_attr_list'(Ls, Attr))].
put_attrs(Name/Arity) -->
put_attr(Name, Arity),
{ numbervars([Var, Attr], 0, _) },
{ numbervars([Var, Attr], 0, _) },
[(put_atts(Var, Attr) :- lists:maplist(put_atts(Var), Attr))].
put_attrs((Name/Arity, Atts)) -->
{ nonvar(Atts) },

2
src/prolog/machine/machine_state_impl.rs
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@@ -97,8 +97,6 @@ impl MachineState {
};
}
// from the assumptions active at the call site in bind, we know:
// if addr is a Ref, it precedes h in the heap.
fn bind_attr_var(&mut self, h: usize, addr: Addr) {
match addr.as_var() {
Some(Ref::HeapCell(hc)) => {

24
src/tests.rs
View File

@@ -2147,33 +2147,33 @@ fn test_queries_on_attributed_variables()
assert_prolog_success!(&mut wam, "?- ( put_atts(V, my_mod, dif(1)) ; put_atts(V, my_mod, dif(2)) ),
get_atts(V, my_mod, L).",
[["L = [dif(1) | _16]", "V = _12"],
["L = [dif(2) | _16]", "V = _12"]]);
[["L = [dif(1)]", "V = _12"],
["L = [dif(2)]", "V = _12"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, frozen(a)),
( put_atts(V, my_mod, dif(1))
; put_atts(V, my_mod, -frozen(a)), put_atts(V, my_mod, dif(2))
; put_atts(V, my_mod, dif(different)) ),
get_atts(V, my_mod, Ls).",
[["Ls = [frozen(a), dif(1) | _36]", "V = _12"],
["Ls = [dif(2) | _50]", "V = _12"],
["Ls = [frozen(a), dif(different) | _36]", "V = _12"]]);
[["Ls = [frozen(a), dif(1)]", "V = _12"],
["Ls = [dif(2)]", "V = _12"],
["Ls = [frozen(a), dif(different)]", "V = _12"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a)]),
( put_atts(V, my_mod, -dif(2)); put_atts(V, my_mod, -frozen(A)) ),
get_atts(V, my_mod, L).",
[["A = _69", "L = [dif(1), frozen(a) | _67]", "V = _27"],
["A = _69", "L = [dif(1), dif(2) | _67]", "V = _27"]]);
[["A = _69", "L = [dif(1), frozen(a)]", "V = _27"],
["A = _69", "L = [dif(1), dif(2)]", "V = _27"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a)]),
( put_atts(V, my_mod, -dif(2)), V = f(a)
; put_atts(V, my_mod, -frozen(_)), get_atts(V, my_mod, L) ).",
[["L = _69", "V = f(a)"],
["L = [dif(1), dif(2) | _67]", "V = _27"]]);
["L = [dif(1), dif(2)]", "V = _27"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a), frozen(b)]),
( put_atts(V, my_mod, -dif(2)) ; put_atts(V, my_mod, -frozen(A)) ),
get_atts(V, my_mod, L).",
[["A = _97", "L = [dif(1), frozen(a), frozen(b) | _95]", "V = _31"],
["A = _97", "L = [dif(1), dif(2) | _95]", "V = _31"]]);
[["A = _97", "L = [dif(1), frozen(a), frozen(b)]", "V = _31"],
["A = _97", "L = [dif(1), dif(2)]", "V = _31"]]);
assert_prolog_failure!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a), frozen(b)]),
get_atts(V, my_mod, -dif(1)).");
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a), frozen(b)]),
@@ -2184,8 +2184,8 @@ fn test_queries_on_attributed_variables()
["X = 2", "V = _31"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), dif(2), frozen(a), frozen(b)]),
put_atts(V, my_mod, -dif(A)), get_atts(V, my_mod, Ls).",
[["A = _98", "Ls = [frozen(a), frozen(b) | _95]", "V = _31"]]);
[["A = _98", "Ls = [frozen(a), frozen(b)]", "V = _31"]]);
assert_prolog_success!(&mut wam, "?- put_atts(V, my_mod, [dif(1), frozen(a), dif(2), frozen(b)]),
put_atts(V, my_mod, -dif(A)), get_atts(V, my_mod, Ls).",
[["A = _98", "Ls = [frozen(a), frozen(b) | _95]", "V = _31"]]);
[["A = _98", "Ls = [frozen(a), frozen(b)]", "V = _31"]]);
}