Commit | Line | Data |
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1 | package DX::RuleSet; |
2 | |
3 | use Moo; |
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4 | use DX::Op::SetupScope; |
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5 | use DX::Op::CallRule; |
6 | use DX::Op::MemberOf; |
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7 | use DX::Op::ApplyConstraint; |
8 | use DX::Op::Return; |
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9 | use DX::Op::Cut; |
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10 | use DX::Op::Backtrack; |
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11 | use DX::Op::Observe; |
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12 | use DX::Op::Not; |
13 | use DX::Op::ProposeAction; |
14 | use DX::Op::Materialize; |
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15 | use DX::Op::Prop; |
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16 | use DX::Op::Exists; |
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17 | use List::Util qw(reduce); |
18 | |
19 | has rules => (is => 'ro', default => sub { {} }); |
20 | |
21 | sub add_rule { |
22 | my ($self, $name, $vars, @body) = @_; |
23 | my $full_name = join('/', $name, scalar @$vars); |
24 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
25 | return $self; |
26 | } |
27 | |
28 | sub _make_rule { |
29 | my ($self, $vars, @body) = @_; |
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30 | my $head = $self->expand_and_link(DX::Op::Return->new, @body); |
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31 | DX::Op::SetupScope->new(arg_names => $vars, next => $head); |
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32 | } |
33 | |
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34 | sub expand_and_link { |
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35 | my ($self, $last, @body) = @_; |
36 | return reduce { $b->but(next => $a) } |
37 | $last, |
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38 | reverse map $self->expand($_), @body; |
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39 | } |
40 | |
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41 | sub expand { |
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42 | my ($self, $thing) = @_; |
43 | if (ref($thing) eq 'ARRAY') { |
44 | my ($type, @rest) = @$thing; |
45 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
46 | return $self->$expand_meth(@rest); |
47 | } |
48 | return $self->_expand_call(@$thing); |
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49 | } |
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50 | return $thing; |
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51 | } |
52 | |
53 | sub _expand_call { |
54 | my ($self, $name, @args) = @_; |
55 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
56 | } |
57 | |
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58 | sub _expand_op_cut { return DX::Op::Cut->new } |
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59 | |
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60 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
61 | |
62 | sub _expand_op_not { |
63 | my ($self, @contents) = @_; |
64 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
65 | DX::Op::Not->new( |
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66 | body => $self->expand_and_link($cut, @contents) |
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67 | ); |
68 | } |
69 | |
70 | sub _expand_op_member_of { |
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71 | my ($self, $member_var, $coll_var) = @_; |
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72 | DX::Op::MemberOf->new( |
73 | member_var => $member_var, |
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74 | coll_var => $coll_var, |
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75 | ); |
76 | } |
77 | |
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78 | sub _expand_op_constrain { |
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79 | my ($self, $vars, $constraint) = @_; |
80 | DX::Op::ApplyConstraint->new( |
81 | vars => $vars, |
82 | constraint => $constraint |
83 | ); |
84 | } |
85 | |
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86 | sub _expand_op_observe { |
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87 | my ($self, $vars, $builder) = @_; |
88 | DX::Op::Observe->new( |
89 | vars => $vars, |
90 | builder => $builder, |
91 | ); |
92 | } |
93 | |
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94 | sub _expand_op_act { |
95 | my ($self, $vars, $builder) = @_; |
96 | DX::Op::ProposeAction->new( |
97 | vars => $vars, |
98 | builder => $builder, |
99 | ); |
100 | } |
101 | |
102 | sub _expand_op_materialize { |
103 | my ($self, $var_name) = @_; |
104 | DX::Op::Materialize->new(var_name => $var_name); |
105 | } |
106 | |
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107 | sub _expand_op_prop { |
108 | my ($self, @args) = @_; |
109 | my %new; @new{qw(of name value)} = @args; |
110 | DX::Op::Prop->new(%new); |
111 | } |
112 | |
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113 | sub _expand_op_exists { |
114 | my ($self, $vars, @body) = @_; |
115 | DX::Op::Exists->new( |
116 | vars => $vars, |
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117 | body => $self->expand_and_link(DX::Op::Return->new, @body) |
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118 | ); |
119 | } |
120 | |
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121 | 1; |