6 use DX::Op::ApplyConstraint;
9 use List::Util qw(reduce);
11 has rules => (is => 'ro', default => sub { {} });
14 my ($self, $name, $vars, @body) = @_;
15 my $full_name = join('/', $name, scalar @$vars);
16 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
21 my ($self, $vars, @body) = @_;
22 my $head = reduce { $b->but(next => $a) }
24 reverse map $self->expand(@$_), @body;
29 my ($self, $type, @rest) = @_;
30 if ($self->can(my $expand_meth = "_expand_${type}")) {
31 return $self->$expand_meth(@rest);
33 return $self->_expand_call($type, @rest);
37 my ($self, $name, @args) = @_;
38 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
41 sub _expand_cut { return DX::Op::Cut->new }
43 sub _expand_member_of {
44 my ($self, $member_var, $coll_var) = @_;
45 DX::Op::MemberOf->new(
46 member_var => $member_var,
47 coll_var => $coll_var,
51 sub _expand_constrain {
52 my ($self, $vars, $constraint) = @_;
53 DX::Op::ApplyConstraint->new(
55 constraint => $constraint