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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 | our $VERSION = '0.73_01'; |
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11 | $VERSION = eval $VERSION; |
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12 | our $AUTHORITY = 'cpan:STEVAN'; |
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13 | |
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14 | use base 'Moose::Meta::TypeConstraint'; |
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15 | |
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16 | __PACKAGE__->meta->add_attribute('class' => ( |
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17 | reader => 'class', |
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18 | )); |
19 | |
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20 | sub new { |
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21 | my ( $class, %args ) = @_; |
22 | |
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23 | $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object'); |
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24 | my $self = $class->_new(\%args); |
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25 | |
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26 | $self->_create_hand_optimized_type_constraint; |
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27 | $self->compile_type_constraint(); |
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28 | |
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29 | return $self; |
30 | } |
31 | |
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32 | sub _create_hand_optimized_type_constraint { |
33 | my $self = shift; |
34 | my $class = $self->class; |
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35 | $self->hand_optimized_type_constraint( |
36 | sub { |
37 | blessed( $_[0] ) && $_[0]->isa($class) |
38 | } |
39 | ); |
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40 | } |
41 | |
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42 | sub parents { |
43 | my $self = shift; |
44 | return ( |
45 | $self->parent, |
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46 | map { |
47 | # FIXME find_type_constraint might find a TC named after the class but that isn't really it |
48 | # I did this anyway since it's a convention that preceded TypeConstraint::Class, and it should DWIM |
49 | # if anybody thinks this problematic please discuss on IRC. |
50 | # a possible fix is to add by attr indexing to the type registry to find types of a certain property |
51 | # regardless of their name |
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52 | Moose::Util::TypeConstraints::find_type_constraint($_) |
53 | || |
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54 | __PACKAGE__->new( class => $_, name => "__ANON__" ) |
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55 | } Class::MOP::class_of($self->class)->superclasses, |
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56 | ); |
57 | } |
58 | |
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59 | sub equals { |
60 | my ( $self, $type_or_name ) = @_; |
61 | |
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62 | my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
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63 | |
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64 | return unless defined $other; |
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65 | return unless $other->isa(__PACKAGE__); |
66 | |
67 | return $self->class eq $other->class; |
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68 | } |
69 | |
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70 | sub is_a_type_of { |
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71 | my ($self, $type_or_name) = @_; |
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72 | |
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73 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name); |
74 | |
75 | ($self->equals($type) || $self->is_subtype_of($type_or_name)); |
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76 | } |
77 | |
78 | sub is_subtype_of { |
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79 | my ($self, $type_or_name_or_class ) = @_; |
80 | |
81 | if ( not ref $type_or_name_or_class ) { |
82 | # it might be a class |
83 | return 1 if $self->class->isa( $type_or_name_or_class ); |
84 | } |
85 | |
86 | my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_class); |
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87 | |
88 | return unless defined $type; |
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89 | |
90 | if ( $type->isa(__PACKAGE__) ) { |
91 | # if $type_or_name_or_class isn't a class, it might be the TC name of another ::Class type |
92 | # or it could also just be a type object in this branch |
93 | return $self->class->isa( $type->class ); |
94 | } else { |
95 | # the only other thing we are a subtype of is Object |
96 | $self->SUPER::is_subtype_of($type); |
97 | } |
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98 | } |
99 | |
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100 | # This is a bit counter-intuitive, but a child type of a Class type |
101 | # constraint is not itself a Class type constraint (it has no class |
102 | # attribute). This whole create_child_type thing needs some changing |
103 | # though, probably making MMC->new a factory or something. |
104 | sub create_child_type { |
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105 | my ($self, @args) = @_; |
106 | return Moose::Meta::TypeConstraint->new(@args, parent => $self); |
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107 | } |
108 | |
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109 | 1; |
110 | |
111 | __END__ |
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112 | |
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113 | =pod |
114 | |
115 | =head1 NAME |
116 | |
117 | Moose::Meta::TypeConstraint::Class - Class/TypeConstraint parallel hierarchy |
118 | |
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119 | =head1 DESCRIPTION |
120 | |
121 | This class represents type constraints for a class. |
122 | |
123 | =head1 INHERITANCE |
124 | |
125 | C<Moose::Meta::TypeConstraint::Class> is a subclass of |
126 | L<Moose::Meta::TypeConstraint>. |
127 | |
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128 | =head1 METHODS |
129 | |
130 | =over 4 |
131 | |
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132 | =item B<< Moose::Meta::TypeConstraint::Class->new(%options) >> |
133 | |
134 | This creates a new class type constraint based on the given |
135 | C<%options>. |
136 | |
137 | It takes the same options as its parent, with two exceptions. First, |
138 | it requires an additional option, C<class>, which is name of the |
139 | constraint's class. Second, it automatically sets the parent to the |
140 | C<Object> type. |
141 | |
142 | The constructor also overrides the hand optimized type constraint with |
143 | one it creates internally. |
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144 | |
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145 | =item B<< $constraint->class >> |
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146 | |
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147 | Returns the class name associated with the constraint. |
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148 | |
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149 | =item B<< $constraint->parents >> |
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150 | |
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151 | Returns all the type's parent types, corresponding to its parent |
152 | classes. |
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153 | |
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154 | =item B<< $constraint->is_subtype_of($type_name_or_object) >> |
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155 | |
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156 | If the given type is also a class type, then this checks that the |
157 | type's class is a subclass of the other type's class. |
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158 | |
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159 | Otherwise it falls back to the implementation in |
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160 | L<Moose::Meta::TypeConstraint>. |
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161 | |
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162 | =item B<< $constraint->create_child_type(%options) >> |
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163 | |
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164 | This returns a new L<Moose::Meta::TypeConstraint> object with the type |
165 | as its parent. |
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166 | |
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167 | Note that it does I<not> return a |
168 | C<Moose::Meta::TypeConstraint::Class> object! |
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169 | |
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170 | =back |
171 | |
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172 | =head1 BUGS |
173 | |
174 | All complex software has bugs lurking in it, and this module is no |
175 | exception. If you find a bug please either email me, or add the bug |
176 | to cpan-RT. |
177 | |
178 | =head1 AUTHOR |
179 | |
180 | Yuval Kogman E<lt>nothingmuch@cpan.orgE<gt> |
181 | |
182 | =head1 COPYRIGHT AND LICENSE |
183 | |
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184 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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185 | |
186 | L<http://www.iinteractive.com> |
187 | |
188 | This library is free software; you can redistribute it and/or modify |
189 | it under the same terms as Perl itself. |
190 | |
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191 | =cut |