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1 | package Moose::Meta::TypeConstraint::Parameterized; |
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2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
7 | use Scalar::Util 'blessed'; |
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8 | use Moose::Util::TypeConstraints; |
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9 | use Moose::Meta::TypeConstraint::Parameterizable; |
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10 | |
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11 | use base 'Moose::Meta::TypeConstraint'; |
12 | |
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13 | __PACKAGE__->meta->add_attribute('type_parameter' => ( |
14 | accessor => 'type_parameter', |
15 | predicate => 'has_type_parameter', |
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16 | )); |
17 | |
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18 | __PACKAGE__->meta->add_attribute('parameterized_from' => ( |
19 | accessor => 'parameterized_from', |
20 | predicate => 'has_parameterized_from', |
21 | )); |
22 | |
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23 | sub equals { |
24 | my ( $self, $type_or_name ) = @_; |
25 | |
26 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
27 | |
28 | return unless $other->isa(__PACKAGE__); |
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29 | |
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30 | return ( |
31 | $self->type_parameter->equals( $other->type_parameter ) |
32 | and |
33 | $self->parent->equals( $other->parent ) |
34 | ); |
35 | } |
36 | |
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37 | sub compile_type_constraint { |
38 | my $self = shift; |
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39 | |
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40 | unless ( $self->has_type_parameter ) { |
41 | require Moose; |
42 | Moose->throw_error("You cannot create a Higher Order type without a type parameter"); |
43 | } |
44 | |
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45 | my $type_parameter = $self->type_parameter; |
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46 | |
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47 | unless ( blessed $type_parameter && $type_parameter->isa('Moose::Meta::TypeConstraint') ) { |
48 | require Moose; |
49 | Moose->throw_error("The type parameter must be a Moose meta type"); |
50 | } |
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51 | |
52 | foreach my $type (Moose::Util::TypeConstraints::get_all_parameterizable_types()) { |
53 | if (my $constraint = $type->generate_constraint_for($self)) { |
54 | $self->_set_constraint($constraint); |
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55 | return $self->SUPER::compile_type_constraint; |
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56 | } |
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57 | } |
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58 | |
59 | # if we get here, then we couldn't |
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60 | # find a way to parameterize this type |
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61 | require Moose; |
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62 | Moose->throw_error("The " . $self->name . " constraint cannot be used, because " |
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63 | . $self->parent->name . " doesn't subtype or coerce from a parameterizable type."); |
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64 | } |
65 | |
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66 | sub has_inlined_type_constraint { |
67 | my $self = shift; |
68 | |
69 | return $self->has_parameterized_from |
70 | && $self->has_parameterized_from->has_inline_generator; |
71 | } |
72 | |
73 | sub _inline_check { |
74 | my $self = shift; |
75 | |
76 | return |
77 | unless $self->has_parameterized_from |
78 | && $self->has_parameterized_from->has_inline_generator; |
79 | |
80 | return $self->parameterized_from->generate_inline_for( $self->type, @_ ); |
81 | } |
82 | |
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83 | sub create_child_type { |
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84 | my ($self, %opts) = @_; |
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85 | return Moose::Meta::TypeConstraint::Parameterizable->new(%opts, parent=>$self); |
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86 | } |
87 | |
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88 | 1; |
89 | |
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90 | # ABSTRACT: Type constraints with a bound parameter (ArrayRef[Int]) |
91 | |
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92 | __END__ |
93 | |
94 | |
95 | =pod |
96 | |
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97 | =head1 METHODS |
98 | |
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99 | This class is intentionally not documented because the API is |
100 | confusing and needs some work. |
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101 | |
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102 | =head1 INHERITANCE |
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103 | |
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104 | C<Moose::Meta::TypeConstraint::Parameterized> is a subclass of |
105 | L<Moose::Meta::TypeConstraint>. |
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106 | |
107 | =head1 BUGS |
108 | |
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109 | See L<Moose/BUGS> for details on reporting bugs. |
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110 | |
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111 | =cut |