package DX::State;
use Return::MultiLevel qw(with_return);
-use DX::Op::FromCode;
+use DX::Op::Backtrack;
use Scalar::Util qw(blessed);
use Moo;
);
}
-sub bind_var_then {
- my ($self, $var, $value, $then) = @_;
- my $bound = $var->with_value($value);
+sub bind_value {
+ my ($self, $var_id, $value) = @_;
+ my $bound = $self->by_id->{$var_id}->with_value($value);
$self->but(
- by_id => { %{$self->by_id}, $var->id => $bound },
- next_op => $then
+ by_id => { %{$self->by_id}, $var_id => $bound },
);
}
)->mark_choice($bound);
}
+sub bind_root_set_then {
+ my ($self, $var_id, $set, $then) = @_;
+ my $bound = $self->by_id->{$var_id}->with_root_set($set);
+ $self->but(
+ by_id => { %{$self->by_id}, $var_id => $bound },
+ next_op => $then
+ )->mark_choice($bound);
+}
+
sub mark_choice {
my ($self, $var) = @_;
$self->but(last_choice => [ $self, $var ]);
sub return_from_run {
my (undef, $return) = @_;
- (our $Nonlocal_Return)->($return);
+ (our $Run_Return)->($return);
+}
+
+sub return_from_op {
+ my (undef, $return) = @_;
+ if (our $Op_Return) {
+ $Op_Return->($return);
+ }
}
sub run {
my ($state) = @_;
with_return {
my ($return) = @_;
- local our $Nonlocal_Return = $return;
+ local our $Run_Return = $return;
while (my $op = $state->next_op) {
- $state = $op->run($state);
+ my $backtrack = with_return {
+ my ($return) = @_;
+ local our $Op_Return = $return;
+ $state = $op->run($state);
+ return;
+ };
+ if ($backtrack) { $state = $state->backtrack }
}
return $state;
}
}
sub push_backtrack {
- $_[0]->then(DX::Op::FromCode->new(code => sub { $_[1]->backtrack }));
+ $_[0]->then(DX::Op::Backtrack->new);
}
sub but {
my ($self) = @_;
my @stack = @{$self->return_stack};
my $top = pop @stack;
- $self->but(return_stack => \@stack, next_op => $top);
+ $self->but(return_stack => \@stack, next_op => $top->[0]);
}
sub push_return_then {
my ($self, $return, $then) = @_;
$self->but(
- return_stack => [ @{$self->return_stack}, $return ],
+ return_stack => [ @{$self->return_stack}, [ $return, $self ] ],
next_op => $then
);
}