3 use Return::MultiLevel qw(with_return);
5 use Scalar::Util qw(blessed);
6 use List::MoreUtils qw(uniq);
10 has next_op => (is => 'ro', required => 1);
12 has return_stack => (is => 'ro', required => 1);
14 has by_id => (is => 'ro', required => 1);
16 has scope => (is => 'ro', required => 1);
18 has last_choice => (is => 'ro', required => 1);
20 has id_gen => (is => 'ro', default => sub { {} });
22 has rule_set => (is => 'ro');
24 has facts => (is => 'ro');
26 has dependencies => (is => 'ro', default => sub { {} });
28 has actions => (is => 'ro', default => sub { {} });
31 my ($self, $name) = @_;
32 my $id = $self->scope->{$name}
33 or die "no such variable in scope: $name";
38 my ($self, $var) = @_;
39 die("FUCK") unless $var;
40 die "Can't resolve unbound ${\$var->id}" unless $var->is_bound;
41 my $val = $var->bound_value;
42 if ($val->$_does('DX::Role::Ref')) {
43 return $val->resolve($self);
49 my ($self, $name, $var, $id_gen) = @_;
50 my $id = join('_', $name, ++($id_gen->{$name}||='000'));
51 DX::Var->new(id => $id, %$var);
55 my ($self, %vars) = @_;
56 my %by_id = %{$self->by_id};
57 my %id_gen = %{$self->id_gen};
58 foreach my $name (keys %vars) {
59 unless (blessed($vars{$name})) {
60 my $var = $vars{$name} = $self->allocate_var(
61 $name, $vars{$name}, \%id_gen
63 $by_id{$var->id} = $var;
67 by_id => \%by_id, id_gen => \%id_gen,
72 my ($self, $action) = @_;
73 my %id_gen = %{$self->id_gen};
74 my ($type) = (ref($action) =~ /([^:]+)$/);
75 my $id = join('_', $type, ++($id_gen{$type}||='000'));
76 my $recorded = $action->but(id => $id);
79 actions => { %{$self->actions}, $id => $recorded }
84 my ($self, %vars) = @_;
85 my ($state, %expanded) = $self->expand_vars(%vars);
87 scope => { %{$self->scope}, map +($_ => $expanded{$_}->id), keys %expanded }
92 my ($self, $var_id, $value) = @_;
93 my $bound = $self->by_id->{$var_id}->with_value($value);
95 by_id => { %{$self->by_id}, $var_id => $bound },
100 my ($self, $var, $stream) = @_;
101 my $bound = $var->with_stream($stream);
103 by_id => { %{$self->by_id}, $var->id => $bound },
104 )->mark_choice($bound);
108 my ($self, $var_id, $set) = @_;
109 my $bound = $self->by_id->{$var_id}->with_root_set($set);
111 by_id => { %{$self->by_id}, $var_id => $bound },
112 )->mark_choice($bound);
116 my ($self, $var) = @_;
117 $self->but(last_choice => [ $self, $var ]);
122 my ($state, $var) = ($self);
123 while (($state, $var) = @{$state->last_choice}) {
124 $var->bound_value; $var->clear_bound_value;
125 return $state->mark_choice($var) unless $var->bound_stream->is_exhausted;
127 $self->return_from_run(undef);
131 my ($self, $then) = @_;
132 $self->but(next_op => $then);
135 sub return_from_run {
136 my (undef, $return) = @_;
137 (our $Run_Return)->($return);
141 my (undef, $return) = @_;
142 if (our $Op_Return) {
143 $Op_Return->($return);
151 local our $Run_Return = $return;
152 while (my $op = $state->next_op) {
153 my $backtrack = with_return {
155 local our $Op_Return = $return;
156 $state = $op->run($state);
159 if ($backtrack) { $state = $state->backtrack }
166 $_[0]->then(DX::Op::Backtrack->new);
170 my ($self, @but) = @_;
171 $self->new(%$self, @but);
174 sub pop_return_stack {
176 my @stack = @{$self->return_stack};
177 my $top = pop @stack;
178 $self->but(return_stack => \@stack, next_op => $top->[0]);
181 sub push_return_then {
182 my ($self, $return, $then) = @_;
184 return_stack => [ @{$self->return_stack}, [ $return, $self ] ],
189 sub add_dependencies {
190 my ($self, @pairs) = @_;
191 my %deps = %{$self->dependencies};
192 while (my ($from, $to) = splice(@pairs, 0, 2)) {
193 unless ($deps{$from}{$to}) {
194 $deps{$from} = { %{$deps{$from}||{}}, $to => 1 };
197 $self->but(dependencies => \%deps);
200 sub action_dependencies {
201 my ($self, @ids) = @_;
203 my $deps = $self->dependencies;
204 my $by_id = $self->by_id;
207 while (my $id = shift @queue) {
209 my $value = $self->resolve_value($by_id->{$id});
210 push @found, $value if $value->$_does('DX::Role::Fact')
211 and $value->has_required_action;
212 push @queue, grep !$seen{$_}, keys %{$deps->{$id}};
214 return uniq map $_->required_action, @found;
219 my $by_id = $self->by_id;
220 $self->but(by_id => {
221 map +($_ => $by_id->{$_}->copy), keys %$by_id