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, $name) = @_;
32 return !!$self->scope->{$name};
36 my ($self, $name) = @_;
37 my $id = $self->scope->{$name}
38 or die "no such variable in scope: $name";
43 my ($self, $var) = @_;
44 die("FUCK") unless $var;
45 die "Can't resolve unbound ${\$var->id}" unless $var->is_bound;
46 my $val = $var->bound_value;
47 if ($val->$_does('DX::Role::Ref')) {
48 return $val->resolve($self);
54 my ($self, $name, $var, $id_gen) = @_;
55 my $id = join('_', $name, ++($id_gen->{$name}||='000'));
56 DX::Var->new(id => $id, %$var);
60 my ($self, %vars) = @_;
61 my %by_id = %{$self->by_id};
62 my %id_gen = %{$self->id_gen};
63 foreach my $name (keys %vars) {
64 unless (blessed($vars{$name})) {
65 my $var = $vars{$name} = $self->allocate_var(
66 $name, $vars{$name}, \%id_gen
68 $by_id{$var->id} = $var;
72 by_id => \%by_id, id_gen => \%id_gen,
77 my ($self, $action) = @_;
78 my %id_gen = %{$self->id_gen};
79 my ($type) = (ref($action) =~ /([^:]+)$/);
80 my $id = join('_', $type, ++($id_gen{$type}||='000'));
81 my $recorded = $action->but(id => $id);
84 actions => { %{$self->actions}, $id => $recorded }
89 my ($self, %vars) = @_;
90 my ($state, %expanded) = $self->expand_vars(%vars);
92 scope => { %{$self->scope}, map +($_ => $expanded{$_}->id), keys %expanded }
97 my ($self, $var_id, $value) = @_;
98 my $bound = $self->by_id->{$var_id}->with_value($value);
100 by_id => { %{$self->by_id}, $var_id => $bound },
105 my ($self, $var, $stream) = @_;
106 my $bound = $var->with_stream($stream);
108 by_id => { %{$self->by_id}, $var->id => $bound },
109 )->mark_choice($bound);
113 my ($self, $var_id, $set) = @_;
114 my $bound = $self->by_id->{$var_id}->with_root_set($set);
116 by_id => { %{$self->by_id}, $var_id => $bound },
117 )->mark_choice($bound);
121 my ($self, $var) = @_;
122 $self->but(last_choice => [ $self, $var ]);
127 my ($state, $var) = ($self);
128 while (($state, $var) = @{$state->last_choice}) {
129 $var->bound_value; $var->clear_bound_value;
130 return $state->mark_choice($var) unless $var->bound_stream->is_exhausted;
132 $self->return_from_run(undef);
136 my ($self, $then) = @_;
137 $self->but(next_op => $then);
140 sub return_from_run {
141 my (undef, $return) = @_;
142 (our $Run_Return)->($return);
146 my (undef, $return) = @_;
147 if (our $Op_Return) {
148 $Op_Return->($return);
156 local our $Run_Return = $return;
157 while (my $op = $state->next_op) {
158 my $backtrack = with_return {
160 local our $Op_Return = $return;
161 $state = $op->run($state);
164 if ($backtrack) { $state = $state->backtrack }
171 $_[0]->then(DX::Op::Backtrack->new);
175 my ($self, @but) = @_;
176 $self->new(%$self, @but);
179 sub pop_return_stack {
181 my @stack = @{$self->return_stack};
182 my $top = pop @stack;
183 $self->but(return_stack => \@stack, next_op => $top->[0]);
186 sub push_return_then {
187 my ($self, $return, $then) = @_;
189 return_stack => [ @{$self->return_stack}, [ $return, $self ] ],
194 sub add_dependencies {
195 my ($self, @pairs) = @_;
196 my %deps = %{$self->dependencies};
197 while (my ($from, $to) = splice(@pairs, 0, 2)) {
198 unless ($deps{$from}{$to}) {
199 $deps{$from} = { %{$deps{$from}||{}}, $to => 1 };
202 $self->but(dependencies => \%deps);
205 sub action_dependencies {
206 my ($self, @ids) = @_;
208 my $deps = $self->dependencies;
209 my $by_id = $self->by_id;
212 while (my $id = shift @queue) {
214 my $value = $self->resolve_value($by_id->{$id});
215 push @found, $value if $value->$_does('DX::Role::Fact')
216 and $value->has_required_action;
217 push @queue, grep !$seen{$_}, keys %{$deps->{$id}};
219 return uniq map $_->required_action, @found;
224 my $by_id = $self->by_id;
225 $self->but(by_id => {
226 map +($_ => $by_id->{$_}->copy), keys %$by_id