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; |
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14 | use DX::Op::ModifyAction; |
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15 | use DX::Op::Materialize; |
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16 | use DX::Op::Prop; |
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17 | use DX::Op::Exists; |
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18 | use DX::Op::Predicate; |
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19 | use DX::Op::HasAction; |
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20 | use List::Util qw(reduce); |
21 | |
22 | has rules => (is => 'ro', default => sub { {} }); |
23 | |
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24 | sub add_predicate { |
25 | my ($self, $name, $vars, @cases) = @_; |
26 | my $full_name = join('/', $name, scalar @$vars); |
27 | push @{$self->rules->{$full_name}}, DX::Op::Predicate->new( |
28 | arg_names => $vars, arg_cases => \@cases |
29 | ); |
30 | } |
31 | |
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32 | sub add_rule { |
33 | my ($self, $name, $vars, @body) = @_; |
34 | my $full_name = join('/', $name, scalar @$vars); |
35 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
36 | return $self; |
37 | } |
38 | |
39 | sub _make_rule { |
40 | my ($self, $vars, @body) = @_; |
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41 | my $head = $self->expand_and_link(DX::Op::Return->new, @body); |
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42 | DX::Op::SetupScope->new(arg_names => $vars, next => $head); |
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43 | } |
44 | |
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45 | sub expand_and_link { |
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46 | my ($self, $last, @body) = @_; |
47 | return reduce { $b->but(next => $a) } |
48 | $last, |
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49 | reverse map $self->expand($_), @body; |
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50 | } |
51 | |
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52 | sub expand { |
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53 | my ($self, $thing) = @_; |
54 | if (ref($thing) eq 'ARRAY') { |
55 | my ($type, @rest) = @$thing; |
56 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
57 | return $self->$expand_meth(@rest); |
58 | } |
59 | return $self->_expand_call(@$thing); |
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60 | } |
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61 | return $thing; |
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62 | } |
63 | |
64 | sub _expand_call { |
65 | my ($self, $name, @args) = @_; |
66 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
67 | } |
68 | |
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69 | sub _expand_op_cut { return DX::Op::Cut->new } |
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70 | |
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71 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
72 | |
73 | sub _expand_op_not { |
74 | my ($self, @contents) = @_; |
75 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
76 | DX::Op::Not->new( |
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77 | body => $self->expand_and_link($cut, @contents) |
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78 | ); |
79 | } |
80 | |
81 | sub _expand_op_member_of { |
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82 | my ($self, $member_var, $coll_var) = @_; |
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83 | DX::Op::MemberOf->new( |
84 | member_var => $member_var, |
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85 | coll_var => $coll_var, |
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86 | ); |
87 | } |
88 | |
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89 | sub _expand_op_constrain { |
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90 | my ($self, $vars, $constraint) = @_; |
91 | DX::Op::ApplyConstraint->new( |
92 | vars => $vars, |
93 | constraint => $constraint |
94 | ); |
95 | } |
96 | |
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97 | sub _expand_op_observe { |
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98 | my ($self, $vars, $builder) = @_; |
99 | DX::Op::Observe->new( |
100 | vars => $vars, |
101 | builder => $builder, |
102 | ); |
103 | } |
104 | |
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105 | sub _expand_op_act { |
106 | my ($self, $vars, $builder) = @_; |
107 | DX::Op::ProposeAction->new( |
108 | vars => $vars, |
109 | builder => $builder, |
110 | ); |
111 | } |
112 | |
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113 | sub _expand_op_react { |
114 | my ($self, $vars, $builder) = @_; |
115 | DX::Op::ModifyAction->new( |
116 | vars => $vars, |
117 | builder => $builder, |
118 | ); |
119 | } |
120 | |
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121 | sub _expand_op_materialize { |
122 | my ($self, $var_name) = @_; |
123 | DX::Op::Materialize->new(var_name => $var_name); |
124 | } |
125 | |
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126 | sub _expand_op_prop { |
127 | my ($self, @args) = @_; |
128 | my %new; @new{qw(of name value)} = @args; |
129 | DX::Op::Prop->new(%new); |
130 | } |
131 | |
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132 | sub _expand_op_exists { |
133 | my ($self, $vars, @body) = @_; |
134 | DX::Op::Exists->new( |
135 | vars => $vars, |
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136 | body => $self->expand_and_link(DX::Op::Return->new, @body) |
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137 | ); |
138 | } |
139 | |
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140 | sub _expand_op_has_action { |
141 | my ($self, @args) = @_; |
142 | DX::Op::HasAction->new(arg_spec => \@args); |
143 | } |
144 | |
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145 | 1; |