6 use DX::Op::ApplyConstraint;
12 use DX::Op::ProposeAction;
13 use DX::Op::Materialize;
16 use List::Util qw(reduce);
18 has rules => (is => 'ro', default => sub { {} });
21 my ($self, $name, $vars, @body) = @_;
22 my $full_name = join('/', $name, scalar @$vars);
23 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
28 my ($self, $vars, @body) = @_;
29 my $head = $self->_expand_and_link(DX::Op::Return->new, @body);
33 sub _expand_and_link {
34 my ($self, $last, @body) = @_;
35 return reduce { $b->but(next => $a) }
37 reverse map $self->expand(@$_), @body;
41 my ($self, $type, @rest) = @_;
42 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
43 return $self->$expand_meth(@rest);
45 return $self->_expand_call($type, @rest);
49 my ($self, $name, @args) = @_;
50 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
53 sub _expand_op_cut { return DX::Op::Cut->new }
55 sub _expand_op_fail { return DX::Op::Backtrack->new }
58 my ($self, @contents) = @_;
59 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
61 body => $self->_expand_and_link($cut, @contents)
65 sub _expand_op_member_of {
66 my ($self, $member_var, $coll_var) = @_;
67 DX::Op::MemberOf->new(
68 member_var => $member_var,
69 coll_var => $coll_var,
73 sub _expand_op_constrain {
74 my ($self, $vars, $constraint) = @_;
75 DX::Op::ApplyConstraint->new(
77 constraint => $constraint
81 sub _expand_op_observe {
82 my ($self, $vars, $builder) = @_;
90 my ($self, $vars, $builder) = @_;
91 DX::Op::ProposeAction->new(
97 sub _expand_op_materialize {
98 my ($self, $var_name) = @_;
99 DX::Op::Materialize->new(var_name => $var_name);
102 sub _expand_op_prop {
103 my ($self, @args) = @_;
104 my %new; @new{qw(of name value)} = @args;
105 DX::Op::Prop->new(%new);
108 sub _expand_op_exists {
109 my ($self, $vars, @body) = @_;
112 body => $self->_expand_and_link(DX::Op::Return->new, @body)