6 use DX::Op::ApplyConstraint;
12 use DX::Op::ProposeAction;
13 use DX::Op::Materialize;
15 use List::Util qw(reduce);
17 has rules => (is => 'ro', default => sub { {} });
20 my ($self, $name, $vars, @body) = @_;
21 my $full_name = join('/', $name, scalar @$vars);
22 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
27 my ($self, $vars, @body) = @_;
28 my $head = $self->_expand_and_link(DX::Op::Return->new, @body);
32 sub _expand_and_link {
33 my ($self, $last, @body) = @_;
34 return reduce { $b->but(next => $a) }
36 reverse map $self->expand(@$_), @body;
40 my ($self, $type, @rest) = @_;
41 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
42 return $self->$expand_meth(@rest);
44 return $self->_expand_call($type, @rest);
48 my ($self, $name, @args) = @_;
49 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
52 sub _expand_op_cut { return DX::Op::Cut->new }
54 sub _expand_op_fail { return DX::Op::Backtrack->new }
57 my ($self, @contents) = @_;
58 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
60 body => $self->_expand_and_link($cut, @contents)
64 sub _expand_op_member_of {
65 my ($self, $member_var, $coll_var) = @_;
66 DX::Op::MemberOf->new(
67 member_var => $member_var,
68 coll_var => $coll_var,
72 sub _expand_op_constrain {
73 my ($self, $vars, $constraint) = @_;
74 DX::Op::ApplyConstraint->new(
76 constraint => $constraint
80 sub _expand_op_observe {
81 my ($self, $vars, $builder) = @_;
89 my ($self, $vars, $builder) = @_;
90 DX::Op::ProposeAction->new(
96 sub _expand_op_materialize {
97 my ($self, $var_name) = @_;
98 DX::Op::Materialize->new(var_name => $var_name);
101 sub _expand_op_prop {
102 my ($self, @args) = @_;
103 my %new; @new{qw(of name value)} = @args;
104 DX::Op::Prop->new(%new);