Commit | Line | Data |
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1 | package DX::RuleSet; |
2 | |
3 | use Moo; |
4 | use DX::Op::CallRule; |
5 | use DX::Op::MemberOf; |
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6 | use DX::Op::ApplyConstraint; |
7 | use DX::Op::Return; |
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8 | use DX::Op::Cut; |
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9 | use DX::Op::Backtrack; |
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10 | use DX::Op::Observe; |
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11 | use DX::Op::Not; |
12 | use DX::Op::ProposeAction; |
13 | use DX::Op::Materialize; |
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14 | use DX::Op::Prop; |
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15 | use List::Util qw(reduce); |
16 | |
17 | has rules => (is => 'ro', default => sub { {} }); |
18 | |
19 | sub add_rule { |
20 | my ($self, $name, $vars, @body) = @_; |
21 | my $full_name = join('/', $name, scalar @$vars); |
22 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
23 | return $self; |
24 | } |
25 | |
26 | sub _make_rule { |
27 | my ($self, $vars, @body) = @_; |
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28 | my $head = $self->_expand_and_link(DX::Op::Return->new, @body); |
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29 | [ $vars, $head ]; |
30 | } |
31 | |
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32 | sub _expand_and_link { |
33 | my ($self, $last, @body) = @_; |
34 | return reduce { $b->but(next => $a) } |
35 | $last, |
36 | reverse map $self->expand(@$_), @body; |
37 | } |
38 | |
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39 | sub expand { |
40 | my ($self, $type, @rest) = @_; |
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41 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
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42 | return $self->$expand_meth(@rest); |
43 | } |
44 | return $self->_expand_call($type, @rest); |
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45 | } |
46 | |
47 | sub _expand_call { |
48 | my ($self, $name, @args) = @_; |
49 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
50 | } |
51 | |
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52 | sub _expand_op_cut { return DX::Op::Cut->new } |
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53 | |
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54 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
55 | |
56 | sub _expand_op_not { |
57 | my ($self, @contents) = @_; |
58 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
59 | DX::Op::Not->new( |
60 | body => $self->_expand_and_link($cut, @contents) |
61 | ); |
62 | } |
63 | |
64 | sub _expand_op_member_of { |
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65 | my ($self, $member_var, $coll_var) = @_; |
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66 | DX::Op::MemberOf->new( |
67 | member_var => $member_var, |
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68 | coll_var => $coll_var, |
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69 | ); |
70 | } |
71 | |
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72 | sub _expand_op_constrain { |
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73 | my ($self, $vars, $constraint) = @_; |
74 | DX::Op::ApplyConstraint->new( |
75 | vars => $vars, |
76 | constraint => $constraint |
77 | ); |
78 | } |
79 | |
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80 | sub _expand_op_observe { |
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81 | my ($self, $vars, $builder) = @_; |
82 | DX::Op::Observe->new( |
83 | vars => $vars, |
84 | builder => $builder, |
85 | ); |
86 | } |
87 | |
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88 | sub _expand_op_act { |
89 | my ($self, $vars, $builder) = @_; |
90 | DX::Op::ProposeAction->new( |
91 | vars => $vars, |
92 | builder => $builder, |
93 | ); |
94 | } |
95 | |
96 | sub _expand_op_materialize { |
97 | my ($self, $var_name) = @_; |
98 | DX::Op::Materialize->new(var_name => $var_name); |
99 | } |
100 | |
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101 | sub _expand_op_prop { |
102 | my ($self, @args) = @_; |
103 | my %new; @new{qw(of name value)} = @args; |
104 | DX::Op::Prop->new(%new); |
105 | } |
106 | |
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107 | 1; |