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 = $self->expand_and_link(DX::Op::Return->new, @body);
34 my ($self, $last, @body) = @_;
35 return reduce { $b->but(next => $a) }
37 reverse map $self->expand($_), @body;
41 my ($self, $thing) = @_;
42 if (ref($thing) eq 'ARRAY') {
43 my ($type, @rest) = @$thing;
44 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
45 return $self->$expand_meth(@rest);
47 return $self->_expand_call(@$thing);
53 my ($self, $name, @args) = @_;
54 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
57 sub _expand_op_cut { return DX::Op::Cut->new }
59 sub _expand_op_fail { return DX::Op::Backtrack->new }
62 my ($self, @contents) = @_;
63 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
65 body => $self->expand_and_link($cut, @contents)
69 sub _expand_op_member_of {
70 my ($self, $member_var, $coll_var) = @_;
71 DX::Op::MemberOf->new(
72 member_var => $member_var,
73 coll_var => $coll_var,
77 sub _expand_op_constrain {
78 my ($self, $vars, $constraint) = @_;
79 DX::Op::ApplyConstraint->new(
81 constraint => $constraint
85 sub _expand_op_observe {
86 my ($self, $vars, $builder) = @_;
94 my ($self, $vars, $builder) = @_;
95 DX::Op::ProposeAction->new(
101 sub _expand_op_materialize {
102 my ($self, $var_name) = @_;
103 DX::Op::Materialize->new(var_name => $var_name);
106 sub _expand_op_prop {
107 my ($self, @args) = @_;
108 my %new; @new{qw(of name value)} = @args;
109 DX::Op::Prop->new(%new);
112 sub _expand_op_exists {
113 my ($self, $vars, @body) = @_;
116 body => $self->expand_and_link(DX::Op::Return->new, @body)