3 use Return::MultiLevel qw(with_return);
5 use Scalar::Util qw(blessed);
9 has next_op => (is => 'ro', required => 1);
11 has return_stack => (is => 'ro', required => 1);
13 has by_id => (is => 'ro', required => 1);
15 has scope => (is => 'ro', required => 1);
17 has last_choice => (is => 'ro', required => 1);
19 has id_gen => (is => 'ro', default => sub { {} });
21 has rule_set => (is => 'ro');
23 has facts => (is => 'ro');
25 has dependencies => (is => 'ro', default => sub { {} });
28 my ($self, $name) = @_;
29 $self->by_id->{$self->scope->{$name}};
33 my ($self, $var) = @_;
34 my $val = $var->bound_value;
35 if ($val->$_does('DX::Role::Ref')) {
36 return $val->resolve($self);
42 my ($self, $name, $var, $id_gen) = @_;
43 my $id = join('_', $name, ++($id_gen->{$name}||='000'));
44 DX::Var->new(id => $id, %$var);
48 my ($self, %vars) = @_;
49 my %by_id = %{$self->by_id};
50 my %id_gen = %{$self->id_gen};
51 foreach my $name (keys %vars) {
52 unless (blessed($vars{$name})) {
53 my $var = $vars{$name} = $self->allocate_var(
54 $name, $vars{$name}, \%id_gen
56 $by_id{$var->id} = $var;
60 by_id => \%by_id, id_gen => \%id_gen,
65 my ($self, %vars) = @_;
66 my ($state, %expanded) = $self->expand_vars(%vars);
68 scope => { %{$self->scope}, map +($_ => $expanded{$_}->id), keys %expanded }
73 my ($self, $var_id, $value) = @_;
74 my $bound = $self->by_id->{$var_id}->with_value($value);
76 by_id => { %{$self->by_id}, $var_id => $bound },
81 my ($self, $var, $stream) = @_;
82 my $bound = $var->with_stream($stream);
84 by_id => { %{$self->by_id}, $var->id => $bound },
85 )->mark_choice($bound);
89 my ($self, $var_id, $set) = @_;
90 my $bound = $self->by_id->{$var_id}->with_root_set($set);
92 by_id => { %{$self->by_id}, $var_id => $bound },
93 )->mark_choice($bound);
97 my ($self, $var) = @_;
98 $self->but(last_choice => [ $self, $var ]);
103 my ($state, $var) = ($self);
104 while (($state, $var) = @{$state->last_choice}) {
105 $var->bound_value; $var->clear_bound_value;
106 return $state->mark_choice($var) unless $var->bound_stream->is_exhausted;
108 $self->return_from_run(undef);
112 my ($self, $then) = @_;
113 $self->but(next_op => $then);
116 sub return_from_run {
117 my (undef, $return) = @_;
118 (our $Run_Return)->($return);
122 my (undef, $return) = @_;
123 if (our $Op_Return) {
124 $Op_Return->($return);
132 local our $Run_Return = $return;
133 while (my $op = $state->next_op) {
134 my $backtrack = with_return {
136 local our $Op_Return = $return;
137 $state = $op->run($state);
140 if ($backtrack) { $state = $state->backtrack }
147 $_[0]->then(DX::Op::Backtrack->new);
151 my ($self, @but) = @_;
152 $self->new(%$self, @but);
155 sub pop_return_stack {
157 my @stack = @{$self->return_stack};
158 my $top = pop @stack;
159 $self->but(return_stack => \@stack, next_op => $top->[0]);
162 sub push_return_then {
163 my ($self, $return, $then) = @_;
165 return_stack => [ @{$self->return_stack}, [ $return, $self ] ],
170 sub add_dependencies {
171 my ($self, @pairs) = @_;
172 my %deps = %{$self->dependencies};
173 while (my ($from, $to) = splice(@pairs, 0, 2)) {
174 unless ($deps{$from}{$to}) {
175 $deps{$from} = { %{$deps{$from}||{}}, $to => 1 };
178 $self->but(dependencies => \%deps);
181 sub action_dependencies {
182 my ($self, @ids) = @_;
184 my $deps = $self->dependencies;
185 my $by_id = $self->by_id;
188 while (my $id = shift @queue) {
190 my $value = $self->resolve_value($by_id->{$id});
191 push @found, $id if $value->$_does('DX::Role::Fact')
192 and $value->has_required_action;
193 push @queue, grep !$seen{$_}, keys %{$deps->{$id}};
200 my $by_id = $self->by_id;
201 $self->but(by_id => {
202 map +($_ => $by_id->{$_}->copy), keys %$by_id