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