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 DX::Op::Exists; |
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16 | use List::Util qw(reduce); |
17 | |
18 | has rules => (is => 'ro', default => sub { {} }); |
19 | |
20 | sub add_rule { |
21 | my ($self, $name, $vars, @body) = @_; |
22 | my $full_name = join('/', $name, scalar @$vars); |
23 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
24 | return $self; |
25 | } |
26 | |
27 | sub _make_rule { |
28 | my ($self, $vars, @body) = @_; |
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29 | my $head = $self->_expand_and_link(DX::Op::Return->new, @body); |
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30 | [ $vars, $head ]; |
31 | } |
32 | |
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33 | sub _expand_and_link { |
34 | my ($self, $last, @body) = @_; |
35 | return reduce { $b->but(next => $a) } |
36 | $last, |
37 | reverse map $self->expand(@$_), @body; |
38 | } |
39 | |
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40 | sub expand { |
41 | my ($self, $type, @rest) = @_; |
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42 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
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43 | return $self->$expand_meth(@rest); |
44 | } |
45 | return $self->_expand_call($type, @rest); |
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46 | } |
47 | |
48 | sub _expand_call { |
49 | my ($self, $name, @args) = @_; |
50 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
51 | } |
52 | |
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53 | sub _expand_op_cut { return DX::Op::Cut->new } |
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54 | |
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55 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
56 | |
57 | sub _expand_op_not { |
58 | my ($self, @contents) = @_; |
59 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
60 | DX::Op::Not->new( |
61 | body => $self->_expand_and_link($cut, @contents) |
62 | ); |
63 | } |
64 | |
65 | sub _expand_op_member_of { |
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66 | my ($self, $member_var, $coll_var) = @_; |
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67 | DX::Op::MemberOf->new( |
68 | member_var => $member_var, |
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69 | coll_var => $coll_var, |
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70 | ); |
71 | } |
72 | |
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73 | sub _expand_op_constrain { |
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74 | my ($self, $vars, $constraint) = @_; |
75 | DX::Op::ApplyConstraint->new( |
76 | vars => $vars, |
77 | constraint => $constraint |
78 | ); |
79 | } |
80 | |
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81 | sub _expand_op_observe { |
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82 | my ($self, $vars, $builder) = @_; |
83 | DX::Op::Observe->new( |
84 | vars => $vars, |
85 | builder => $builder, |
86 | ); |
87 | } |
88 | |
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89 | sub _expand_op_act { |
90 | my ($self, $vars, $builder) = @_; |
91 | DX::Op::ProposeAction->new( |
92 | vars => $vars, |
93 | builder => $builder, |
94 | ); |
95 | } |
96 | |
97 | sub _expand_op_materialize { |
98 | my ($self, $var_name) = @_; |
99 | DX::Op::Materialize->new(var_name => $var_name); |
100 | } |
101 | |
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102 | sub _expand_op_prop { |
103 | my ($self, @args) = @_; |
104 | my %new; @new{qw(of name value)} = @args; |
105 | DX::Op::Prop->new(%new); |
106 | } |
107 | |
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108 | sub _expand_op_exists { |
109 | my ($self, $vars, @body) = @_; |
110 | DX::Op::Exists->new( |
111 | vars => $vars, |
112 | body => $self->_expand_and_link(DX::Op::Return->new, @body) |
113 | ); |
114 | } |
115 | |
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116 | 1; |