1 package DX::Predicate::MemberAt;
3 use DX::Utils qw(step INDICES_OF EXISTENCE_OF CONTENTS_OF string);
4 use DX::ActionBuilder::ProxySetToAdd;
5 use DX::ActionBuilder::Null;
8 with 'DX::Role::Predicate';
10 sub _possible_resolution_list {
11 my ($self, $coll, $key, $value) = @_;
12 die "First argument to member_at must be a structured value"
13 unless $coll->does('DX::Role::StructuredValue');
14 my $basic_deps = sub {
16 [ EXISTENCE_OF ,=> $coll, ($_[1]||$_[0])->string_value ],
17 [ CONTENTS_OF ,=> $_[0] ],
18 [ CONTENTS_OF ,=> $coll, ($_[1]||$_[0])->string_value ],
19 [ CONTENTS_OF ,=> $value ],
23 # Already set values are only supported for recheck
24 trace member_at => "+D +K +V";
25 return () unless $key->is_set and my $cur_val = $coll->get_member_at($key);
26 return () unless $cur_val->equals($value);
32 die "Bizarre: member_at called with non-fresh unset value"
33 unless $value->action_builder->isa('DX::ActionBuilder::UnsetValue');
35 trace member_at => "+D +K -V";
36 if (my $cur_val = $coll->get_member_at($key)) {
37 my $set = $value->action_for_set_value($cur_val);
43 if (my $p = $coll->value_path) {
44 my @path = (@$p, $key->string_value);
45 my $ab = DX::ActionBuilder::ProxySetToAdd->new(
46 target_path => \@path,
47 proxy_to => $coll->action_builder,
49 my $set = $value->action_for_set_value(
61 die "Bizarre: member_at called with non-fresh unset key"
62 unless $key->action_builder->isa('DX::ActionBuilder::UnsetValue');
63 trace member_at => "+D -K -V";
65 my $set_key = $key->action_for_set_value(my $kstr = string($_));
66 my $set_value = $value->action_for_set_value($coll->get_member_at($kstr));
68 actions => [ $set_key, $set_value ],
69 $basic_deps->($key, $kstr),
74 sub selection_depends_on {
75 my ($self, $coll, $key, $value) = @_;
77 [ [ $coll => ($key->can_set_value ? INDICES_OF : (EXISTENCE_OF ,=> $key)) ],