Commit | Line | Data |
b40e416a |
1 | package DX::RuleSet; |
2 | |
3 | use Moo; |
4 | use DX::Op::CallRule; |
5 | use DX::Op::MemberOf; |
6 | use DX::Op::MemberLookup; |
7 | use DX::Op::ApplyConstraint; |
8 | use DX::Op::Return; |
9 | use List::Util qw(reduce); |
10 | |
11 | has rules => (is => 'ro', default => sub { {} }); |
12 | |
13 | sub add_rule { |
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); |
17 | return $self; |
18 | } |
19 | |
20 | sub _make_rule { |
21 | my ($self, $vars, @body) = @_; |
22 | my $head = reduce { $b->but(next => $a) } |
23 | DX::Op::Return->new, |
24 | reverse map $self->expand(@$_), @body; |
25 | [ $vars, $head ]; |
26 | } |
27 | |
28 | sub expand { |
29 | my ($self, $type, @rest) = @_; |
30 | $self->${\"_expand_${type}"}(@rest); |
31 | } |
32 | |
33 | sub _expand_call { |
34 | my ($self, $name, @args) = @_; |
35 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
36 | } |
37 | |
38 | sub _expand_member_of { |
39 | my ($self, $member_var, $coll_name) = @_; |
40 | DX::Op::MemberOf->new( |
41 | member_var => $member_var, |
42 | coll_name => $coll_name, |
43 | ); |
44 | } |
45 | |
46 | sub _expand_member_lookup { |
47 | my ($self, $member_var, $coll_name, $key_name, $key_var) = @_; |
48 | DX::Op::MemberLookup->new( |
49 | member_var => $member_var, |
50 | coll_name => $coll_name, |
51 | key_name => $key_name, |
52 | key_var => $key_var |
53 | ); |
54 | } |
55 | |
56 | sub _expand_constrain { |
57 | my ($self, $vars, $constraint) = @_; |
58 | DX::Op::ApplyConstraint->new( |
59 | vars => $vars, |
60 | constraint => $constraint |
61 | ); |
62 | } |
63 | |
64 | 1; |