4 use DX::Op::SetupScope;
7 use DX::Op::ApplyConstraint;
10 use DX::Op::Backtrack;
13 use DX::Op::ProposeAction;
14 use DX::Op::Materialize;
17 use List::Util qw(reduce);
19 has rules => (is => 'ro', default => sub { {} });
22 my ($self, $name, $vars, @body) = @_;
23 my $full_name = join('/', $name, scalar @$vars);
24 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
29 my ($self, $vars, @body) = @_;
30 my $head = $self->expand_and_link(DX::Op::Return->new, @body);
31 DX::Op::SetupScope->new(arg_names => $vars, next => $head);
35 my ($self, $last, @body) = @_;
36 return reduce { $b->but(next => $a) }
38 reverse map $self->expand($_), @body;
42 my ($self, $thing) = @_;
43 if (ref($thing) eq 'ARRAY') {
44 my ($type, @rest) = @$thing;
45 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
46 return $self->$expand_meth(@rest);
48 return $self->_expand_call(@$thing);
54 my ($self, $name, @args) = @_;
55 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
58 sub _expand_op_cut { return DX::Op::Cut->new }
60 sub _expand_op_fail { return DX::Op::Backtrack->new }
63 my ($self, @contents) = @_;
64 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
66 body => $self->expand_and_link($cut, @contents)
70 sub _expand_op_member_of {
71 my ($self, $member_var, $coll_var) = @_;
72 DX::Op::MemberOf->new(
73 member_var => $member_var,
74 coll_var => $coll_var,
78 sub _expand_op_constrain {
79 my ($self, $vars, $constraint) = @_;
80 DX::Op::ApplyConstraint->new(
82 constraint => $constraint
86 sub _expand_op_observe {
87 my ($self, $vars, $builder) = @_;
95 my ($self, $vars, $builder) = @_;
96 DX::Op::ProposeAction->new(
102 sub _expand_op_materialize {
103 my ($self, $var_name) = @_;
104 DX::Op::Materialize->new(var_name => $var_name);
107 sub _expand_op_prop {
108 my ($self, @args) = @_;
109 my %new; @new{qw(of name value)} = @args;
110 DX::Op::Prop->new(%new);
113 sub _expand_op_exists {
114 my ($self, $vars, @body) = @_;
117 body => $self->expand_and_link(DX::Op::Return->new, @body)