Commit | Line | Data |
b40e416a |
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::Predicate; |
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18 | use DX::Op::HasAction; |
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19 | use DX::Op::FindAll; |
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20 | use DX::Op::ForEach; |
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21 | use List::Util qw(reduce); |
22 | |
23 | has rules => (is => 'ro', default => sub { {} }); |
24 | |
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25 | sub add_predicate { |
26 | my ($self, $name, $vars, @cases) = @_; |
27 | my $full_name = join('/', $name, scalar @$vars); |
28 | push @{$self->rules->{$full_name}}, DX::Op::Predicate->new( |
29 | arg_names => $vars, arg_cases => \@cases |
30 | ); |
31 | } |
32 | |
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33 | sub add_rule { |
34 | my ($self, $name, $vars, @body) = @_; |
35 | my $full_name = join('/', $name, scalar @$vars); |
36 | push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body); |
37 | return $self; |
38 | } |
39 | |
40 | sub _make_rule { |
41 | my ($self, $vars, @body) = @_; |
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42 | my $head = $self->expand_and_link(DX::Op::Return->new, @body); |
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43 | DX::Op::SetupScope->new(arg_names => $vars, next => $head); |
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44 | } |
45 | |
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46 | sub expand_and_link { |
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47 | my ($self, $last, @body) = @_; |
48 | return reduce { $b->but(next => $a) } |
49 | $last, |
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50 | reverse map $self->expand($_), @body; |
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51 | } |
52 | |
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53 | sub expand { |
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54 | my ($self, $thing) = @_; |
55 | if (ref($thing) eq 'ARRAY') { |
56 | my ($type, @rest) = @$thing; |
57 | if ($self->can(my $expand_meth = "_expand_op_${type}")) { |
58 | return $self->$expand_meth(@rest); |
59 | } |
60 | return $self->_expand_call(@$thing); |
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61 | } |
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62 | return $thing; |
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63 | } |
64 | |
65 | sub _expand_call { |
66 | my ($self, $name, @args) = @_; |
67 | DX::Op::CallRule->new(rule_name => $name, rule_args => \@args); |
68 | } |
69 | |
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70 | sub _expand_op_cut { return DX::Op::Cut->new } |
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71 | |
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72 | sub _expand_op_fail { return DX::Op::Backtrack->new } |
73 | |
74 | sub _expand_op_not { |
75 | my ($self, @contents) = @_; |
76 | my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new); |
77 | DX::Op::Not->new( |
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78 | body => $self->expand_and_link($cut, @contents) |
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79 | ); |
80 | } |
81 | |
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82 | sub _expand_op_findall { |
83 | my ($self, $coll_name, $var_name, @contents) = @_; |
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84 | DX::Op::FindAll->new( |
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85 | coll_name => $coll_name, |
86 | var_name => $var_name, |
87 | body => $self->expand_and_link(DX::Op::Return->new, @contents), |
88 | ); |
89 | } |
90 | |
f5a02c91 |
91 | sub _expand_op_foreach { |
92 | my ($self, $var_name, $body, $each_body) = @_; |
93 | DX::Op::ForEach->new( |
94 | var_name => $var_name, |
95 | body => $self->expand_and_link(DX::Op::Return->new, @$body), |
96 | each_body => $self->expand_and_link(DX::Op::Return->new, @$each_body), |
97 | ); |
98 | } |
99 | |
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100 | sub _expand_op_member_of { |
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101 | my ($self, $member_var, $coll_var) = @_; |
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102 | DX::Op::MemberOf->new( |
103 | member_var => $member_var, |
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104 | coll_var => $coll_var, |
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105 | ); |
106 | } |
107 | |
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108 | sub _expand_op_constrain { |
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109 | my ($self, $vars, $constraint) = @_; |
110 | DX::Op::ApplyConstraint->new( |
111 | vars => $vars, |
112 | constraint => $constraint |
113 | ); |
114 | } |
115 | |
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116 | sub _expand_op_observe { |
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117 | my ($self, $vars, $builder) = @_; |
118 | DX::Op::Observe->new( |
119 | vars => $vars, |
120 | builder => $builder, |
121 | ); |
122 | } |
123 | |
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124 | sub _expand_op_act { |
125 | my ($self, $vars, $builder) = @_; |
126 | DX::Op::ProposeAction->new( |
127 | vars => $vars, |
128 | builder => $builder, |
129 | ); |
130 | } |
131 | |
2c467394 |
132 | sub _expand_op_react { |
133 | my ($self, $vars, $builder) = @_; |
134 | DX::Op::ModifyAction->new( |
135 | vars => $vars, |
136 | builder => $builder, |
137 | ); |
138 | } |
139 | |
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140 | sub _expand_op_materialize { |
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141 | my ($self) = @_; |
142 | DX::Op::Materialize->new; |
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143 | } |
144 | |
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145 | sub _expand_op_prop { |
146 | my ($self, @args) = @_; |
147 | my %new; @new{qw(of name value)} = @args; |
148 | DX::Op::Prop->new(%new); |
149 | } |
150 | |
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151 | sub _expand_op_has_action { |
152 | my ($self, @args) = @_; |
153 | DX::Op::HasAction->new(arg_spec => \@args); |
154 | } |
155 | |
b40e416a |
156 | 1; |