3 use Return::MultiLevel qw(with_return);
5 use Scalar::Util qw(blessed);
8 has next_op => (is => 'ro', required => 1);
10 has return_stack => (is => 'ro', required => 1);
12 has by_id => (is => 'ro', required => 1);
14 has scope => (is => 'ro', required => 1);
16 has last_choice => (is => 'ro', required => 1);
18 has id_gen => (is => 'ro', default => sub { {} });
21 my ($self, $name) = @_;
22 $self->by_id->{$self->scope->{$name}};
26 my ($self, $name, $var) = @_;
27 my $id = join('_', $name, ++($self->id_gen->{$name}));
28 DX::Var->new(id => $id, %$var);
32 my ($self, %vars) = @_;
33 my %by_id = %{$self->by_id};
34 foreach my $name (keys %vars) {
35 warn "assign: ${name}";
36 unless (blessed($vars{$name})) {
37 my $var = $vars{$name} = $self->allocate_var($name, $vars{$name});
38 $by_id{$var->id} = $var;
43 scope => { %{$self->scope}, map +($_ => $vars{$_}->id), keys %vars }
48 my ($self, $var, $value, $then) = @_;
49 warn "Binding ".$var->id." to $value";
50 my $bound = $var->with_value($value);
52 by_id => { %{$self->by_id}, $var->id => $bound },
57 sub bind_stream_then {
58 my ($self, $var, $stream, $then) = @_;
59 warn "Binding ".$var->id." to $stream";
60 my $bound = $var->with_stream($stream);
62 by_id => { %{$self->by_id}, $var->id => $bound },
64 )->mark_choice($bound);
68 my ($self, $var) = @_;
69 $self->but(last_choice => [ $self, $var ]);
74 my ($state, $var) = ($self);
75 while (($state, $var) = @{$state->last_choice}) {
76 $var->bound_value; $var->clear_bound_value;
77 return $state->mark_choice($var) unless $var->bound_stream->is_exhausted;
79 $self->return_from_run(undef);
83 my ($self, $then) = @_;
84 $self->but(next_op => $then);
88 my (undef, $return) = @_;
89 (our $Nonlocal_Return)->($return);
96 local our $Nonlocal_Return = $return;
97 while (my $op = $state->next_op) {
99 $state = $op->run($state);
106 $_[0]->then(DX::Op::FromCode->new(code => sub { $_[1]->backtrack }));
110 my ($self, @but) = @_;
111 $self->new(%$self, @but);
114 sub pop_return_stack {
116 my @stack = @{$self->return_stack};
117 my $top = pop @stack;
118 $self->but(return_stack => \@stack, next_op => $top);
121 sub push_return_then {
122 my ($self, $return, $then) = @_;
124 return_stack => [ @{$self->return_stack}, $return ],