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1 | package Moose::Meta::TypeConstraint::Class; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use B; |
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8 | use Scalar::Util 'blessed'; |
9 | use Moose::Util::TypeConstraints (); |
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10 | |
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11 | use base 'Moose::Meta::TypeConstraint'; |
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12 | |
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13 | __PACKAGE__->meta->add_attribute('class' => ( |
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14 | reader => 'class', |
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15 | Class::MOP::_definition_context(), |
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16 | )); |
17 | |
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18 | my $inliner = sub { |
19 | my $self = shift; |
20 | my $val = shift; |
21 | |
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22 | return 'Scalar::Util::blessed(' . $val . ')' |
23 | . ' && ' . $val . '->isa(' . B::perlstring($self->class) . ')'; |
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24 | }; |
25 | |
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26 | sub new { |
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27 | my ( $class, %args ) = @_; |
28 | |
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29 | $args{parent} |
30 | = Moose::Util::TypeConstraints::find_type_constraint('Object'); |
31 | |
32 | my $class_name = $args{class}; |
33 | $args{constraint} = sub { $_[0]->isa($class_name) }; |
34 | |
35 | $args{inlined} = $inliner; |
36 | |
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37 | my $self = $class->SUPER::new( \%args ); |
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38 | |
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39 | $self->compile_type_constraint(); |
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40 | |
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41 | return $self; |
42 | } |
43 | |
44 | sub parents { |
45 | my $self = shift; |
46 | return ( |
47 | $self->parent, |
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48 | map { |
49 | # FIXME find_type_constraint might find a TC named after the class but that isn't really it |
50 | # I did this anyway since it's a convention that preceded TypeConstraint::Class, and it should DWIM |
51 | # if anybody thinks this problematic please discuss on IRC. |
52 | # a possible fix is to add by attr indexing to the type registry to find types of a certain property |
53 | # regardless of their name |
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54 | Moose::Util::TypeConstraints::find_type_constraint($_) |
55 | || |
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56 | __PACKAGE__->new( class => $_, name => "__ANON__" ) |
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57 | } Class::MOP::class_of($self->class)->superclasses, |
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58 | ); |
59 | } |
60 | |
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61 | sub equals { |
62 | my ( $self, $type_or_name ) = @_; |
63 | |
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64 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
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65 | |
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66 | if (!defined($other)) { |
67 | if (!ref($type_or_name)) { |
68 | return $self->class eq $type_or_name; |
69 | } |
70 | return; |
71 | } |
72 | |
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73 | return unless $other->isa(__PACKAGE__); |
74 | |
75 | return $self->class eq $other->class; |
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76 | } |
77 | |
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78 | sub is_a_type_of { |
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79 | my ($self, $type_or_name) = @_; |
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80 | |
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81 | ($self->equals($type_or_name) || $self->is_subtype_of($type_or_name)); |
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82 | } |
83 | |
84 | sub is_subtype_of { |
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85 | my ($self, $type_or_name_or_class ) = @_; |
86 | |
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87 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_class); |
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88 | |
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89 | if ( not defined $type ) { |
90 | if ( not ref $type_or_name_or_class ) { |
91 | # it might be a class |
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92 | my $class = $self->class; |
93 | return 1 if $class ne $type_or_name_or_class |
94 | && $class->isa( $type_or_name_or_class ); |
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95 | } |
96 | return; |
97 | } |
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98 | |
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99 | if ( $type->isa(__PACKAGE__) && $type->class ne $self->class) { |
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100 | # if $type_or_name_or_class isn't a class, it might be the TC name of another ::Class type |
101 | # or it could also just be a type object in this branch |
102 | return $self->class->isa( $type->class ); |
103 | } else { |
104 | # the only other thing we are a subtype of is Object |
105 | $self->SUPER::is_subtype_of($type); |
106 | } |
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107 | } |
108 | |
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109 | # This is a bit counter-intuitive, but a child type of a Class type |
110 | # constraint is not itself a Class type constraint (it has no class |
111 | # attribute). This whole create_child_type thing needs some changing |
112 | # though, probably making MMC->new a factory or something. |
113 | sub create_child_type { |
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114 | my ($self, @args) = @_; |
115 | return Moose::Meta::TypeConstraint->new(@args, parent => $self); |
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116 | } |
117 | |
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118 | sub get_message { |
119 | my $self = shift; |
120 | my ($value) = @_; |
121 | |
122 | if ($self->has_message) { |
123 | return $self->SUPER::get_message(@_); |
124 | } |
125 | |
126 | $value = (defined $value ? overload::StrVal($value) : 'undef'); |
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127 | return "Validation failed for '" . $self->name . "' with value $value (not isa " . $self->class . ")"; |
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128 | } |
129 | |
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130 | 1; |
131 | |
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132 | # ABSTRACT: Class/TypeConstraint parallel hierarchy |
133 | |
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134 | __END__ |
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135 | |
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136 | =pod |
137 | |
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138 | =head1 DESCRIPTION |
139 | |
140 | This class represents type constraints for a class. |
141 | |
142 | =head1 INHERITANCE |
143 | |
144 | C<Moose::Meta::TypeConstraint::Class> is a subclass of |
145 | L<Moose::Meta::TypeConstraint>. |
146 | |
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147 | =head1 METHODS |
148 | |
149 | =over 4 |
150 | |
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151 | =item B<< Moose::Meta::TypeConstraint::Class->new(%options) >> |
152 | |
153 | This creates a new class type constraint based on the given |
154 | C<%options>. |
155 | |
156 | It takes the same options as its parent, with two exceptions. First, |
157 | it requires an additional option, C<class>, which is name of the |
158 | constraint's class. Second, it automatically sets the parent to the |
159 | C<Object> type. |
160 | |
161 | The constructor also overrides the hand optimized type constraint with |
162 | one it creates internally. |
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163 | |
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164 | =item B<< $constraint->class >> |
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165 | |
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166 | Returns the class name associated with the constraint. |
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167 | |
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168 | =item B<< $constraint->parents >> |
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169 | |
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170 | Returns all the type's parent types, corresponding to its parent |
171 | classes. |
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172 | |
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173 | =item B<< $constraint->is_subtype_of($type_name_or_object) >> |
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174 | |
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175 | If the given type is also a class type, then this checks that the |
176 | type's class is a subclass of the other type's class. |
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177 | |
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178 | Otherwise it falls back to the implementation in |
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179 | L<Moose::Meta::TypeConstraint>. |
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180 | |
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181 | =item B<< $constraint->create_child_type(%options) >> |
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182 | |
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183 | This returns a new L<Moose::Meta::TypeConstraint> object with the type |
184 | as its parent. |
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185 | |
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186 | Note that it does I<not> return a |
187 | C<Moose::Meta::TypeConstraint::Class> object! |
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188 | |
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189 | =item B<< $constraint->get_message($value) >> |
190 | |
191 | This is the same as L<Moose::Meta::TypeConstraint/get_message> except |
192 | that it explicitly says C<isa> was checked. This is to help users deal |
193 | with accidentally autovivified type constraints. |
194 | |
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195 | =back |
196 | |
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197 | =head1 BUGS |
198 | |
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199 | See L<Moose/BUGS> for details on reporting bugs. |
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200 | |
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201 | =cut |