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