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