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, $head ]; |
31 | } |
32 | |
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33 | sub expand_and_link { |
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34 | my ($self, $last, @body) = @_; |
35 | return reduce { $b->but(next => $a) } |
36 | $last, |
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37 | reverse map $self->expand($_), @body; |
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38 | } |
39 | |
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40 | sub expand { |
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41 | my ($self, $thing) = @_; |
42 | if (ref($thing) eq 'ARRAY') { |
43 | my ($type, @rest) = @$thing; |
44 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
45 | return $self->$expand_meth(@rest); |
46 | } |
47 | return $self->_expand_call(@$thing); |
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48 | } |
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49 | return $thing; |
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50 | } |
51 | |
52 | sub _expand_call { |
53 | my ($self, $name, @args) = @_; |
54 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
55 | } |
56 | |
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57 | sub _expand_op_cut { return DX::Op::Cut->new } |
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58 | |
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59 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
60 | |
61 | sub _expand_op_not { |
62 | my ($self, @contents) = @_; |
63 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
64 | DX::Op::Not->new( |
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65 | body => $self->expand_and_link($cut, @contents) |
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66 | ); |
67 | } |
68 | |
69 | sub _expand_op_member_of { |
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70 | my ($self, $member_var, $coll_var) = @_; |
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71 | DX::Op::MemberOf->new( |
72 | member_var => $member_var, |
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73 | coll_var => $coll_var, |
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74 | ); |
75 | } |
76 | |
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77 | sub _expand_op_constrain { |
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78 | my ($self, $vars, $constraint) = @_; |
79 | DX::Op::ApplyConstraint->new( |
80 | vars => $vars, |
81 | constraint => $constraint |
82 | ); |
83 | } |
84 | |
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85 | sub _expand_op_observe { |
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86 | my ($self, $vars, $builder) = @_; |
87 | DX::Op::Observe->new( |
88 | vars => $vars, |
89 | builder => $builder, |
90 | ); |
91 | } |
92 | |
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93 | sub _expand_op_act { |
94 | my ($self, $vars, $builder) = @_; |
95 | DX::Op::ProposeAction->new( |
96 | vars => $vars, |
97 | builder => $builder, |
98 | ); |
99 | } |
100 | |
101 | sub _expand_op_materialize { |
102 | my ($self, $var_name) = @_; |
103 | DX::Op::Materialize->new(var_name => $var_name); |
104 | } |
105 | |
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106 | sub _expand_op_prop { |
107 | my ($self, @args) = @_; |
108 | my %new; @new{qw(of name value)} = @args; |
109 | DX::Op::Prop->new(%new); |
110 | } |
111 | |
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112 | sub _expand_op_exists { |
113 | my ($self, $vars, @body) = @_; |
114 | DX::Op::Exists->new( |
115 | vars => $vars, |
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116 | body => $self->expand_and_link(DX::Op::Return->new, @body) |
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117 | ); |
118 | } |
119 | |
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120 | 1; |