Commit | Line | Data |
b40e416a |
1 | package DX::RuleSet; |
2 | |
3 | use Moo; |
4 | use DX::Op::CallRule; |
5 | use DX::Op::MemberOf; |
b40e416a |
6 | use DX::Op::ApplyConstraint; |
7 | use DX::Op::Return; |
8 | use List::Util qw(reduce); |
9 | |
10 | has rules => (is => 'ro', default => sub { {} }); |
11 | |
12 | sub add_rule { |
13 | my ($self, $name, $vars, @body) = @_; |
14 | my $full_name = join('/', $name, scalar @$vars); |
15 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
16 | return $self; |
17 | } |
18 | |
19 | sub _make_rule { |
20 | my ($self, $vars, @body) = @_; |
21 | my $head = reduce { $b->but(next => $a) } |
22 | DX::Op::Return->new, |
23 | reverse map $self->expand(@$_), @body; |
24 | [ $vars, $head ]; |
25 | } |
26 | |
27 | sub expand { |
28 | my ($self, $type, @rest) = @_; |
6d533c9d |
29 | if ($self->can(my $expand_meth = "_expand_${type}")) { |
30 | return $self->$expand_meth(@rest); |
31 | } |
32 | return $self->_expand_call($type, @rest); |
b40e416a |
33 | } |
34 | |
35 | sub _expand_call { |
36 | my ($self, $name, @args) = @_; |
37 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
38 | } |
39 | |
40 | sub _expand_member_of { |
385fa954 |
41 | my ($self, $member_var, $coll_var) = @_; |
b40e416a |
42 | DX::Op::MemberOf->new( |
43 | member_var => $member_var, |
385fa954 |
44 | coll_var => $coll_var, |
b40e416a |
45 | ); |
46 | } |
47 | |
b40e416a |
48 | sub _expand_constrain { |
49 | my ($self, $vars, $constraint) = @_; |
50 | DX::Op::ApplyConstraint->new( |
51 | vars => $vars, |
52 | constraint => $constraint |
53 | ); |
54 | } |
55 | |
56 | 1; |