1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
package Moose::Meta::TypeConstraint::Class;
use strict;
use warnings;
use metaclass;
use Scalar::Util 'blessed';
use Moose::Util::TypeConstraints ();
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::TypeConstraint';
__PACKAGE__->meta->add_attribute('class' => (
reader => 'class',
));
sub new {
my ( $class, %args ) = @_;
$args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object');
my $self = $class->_new(\%args);
$self->_create_hand_optimized_type_constraint;
$self->compile_type_constraint();
return $self;
}
sub _create_hand_optimized_type_constraint {
my $self = shift;
my $class = $self->class;
$self->hand_optimized_type_constraint(
sub {
blessed( $_[0] ) && blessed( $_[0] ) ne 'Regexp' && $_[0]->isa($class)
}
);
}
sub parents {
my $self = shift;
return (
$self->parent,
map {
# FIXME find_type_constraint might find a TC named after the class but that isn't really it
# I did this anyway since it's a convention that preceded TypeConstraint::Class, and it should DWIM
# if anybody thinks this problematic please discuss on IRC.
# a possible fix is to add by attr indexing to the type registry to find types of a certain property
# regardless of their name
Moose::Util::TypeConstraints::find_type_constraint($_)
||
__PACKAGE__->new( class => $_, name => "__ANON__" )
} Class::MOP::class_of($self->class)->superclasses,
);
}
sub equals {
my ( $self, $type_or_name ) = @_;
my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
return unless defined $other;
return unless $other->isa(__PACKAGE__);
return $self->class eq $other->class;
}
sub is_a_type_of {
my ($self, $type_or_name) = @_;
my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
($self->equals($type) || $self->is_subtype_of($type_or_name));
}
sub is_subtype_of {
my ($self, $type_or_name_or_class ) = @_;
my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_class);
if ( not defined $type ) {
if ( not ref $type_or_name_or_class ) {
# it might be a class
return 1 if $self->class->isa( $type_or_name_or_class );
}
return;
}
if ( $type->isa(__PACKAGE__) && $type->class ne $self->class) {
# if $type_or_name_or_class isn't a class, it might be the TC name of another ::Class type
# or it could also just be a type object in this branch
return $self->class->isa( $type->class );
} else {
# the only other thing we are a subtype of is Object
$self->SUPER::is_subtype_of($type);
}
}
# This is a bit counter-intuitive, but a child type of a Class type
# constraint is not itself a Class type constraint (it has no class
# attribute). This whole create_child_type thing needs some changing
# though, probably making MMC->new a factory or something.
sub create_child_type {
my ($self, @args) = @_;
return Moose::Meta::TypeConstraint->new(@args, parent => $self);
}
sub get_message {
my $self = shift;
my ($value) = @_;
if ($self->has_message) {
return $self->SUPER::get_message(@_);
}
$value = (defined $value ? overload::StrVal($value) : 'undef');
return "Validation failed for '" . $self->name . "' with value $value (not isa " . $self->class . ")";
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::TypeConstraint::Class - Class/TypeConstraint parallel hierarchy
=head1 DESCRIPTION
This class represents type constraints for a class.
=head1 INHERITANCE
C<Moose::Meta::TypeConstraint::Class> is a subclass of
L<Moose::Meta::TypeConstraint>.
=head1 METHODS
=over 4
=item B<< Moose::Meta::TypeConstraint::Class->new(%options) >>
This creates a new class type constraint based on the given
C<%options>.
It takes the same options as its parent, with two exceptions. First,
it requires an additional option, C<class>, which is name of the
constraint's class. Second, it automatically sets the parent to the
C<Object> type.
The constructor also overrides the hand optimized type constraint with
one it creates internally.
=item B<< $constraint->class >>
Returns the class name associated with the constraint.
=item B<< $constraint->parents >>
Returns all the type's parent types, corresponding to its parent
classes.
=item B<< $constraint->is_subtype_of($type_name_or_object) >>
If the given type is also a class type, then this checks that the
type's class is a subclass of the other type's class.
Otherwise it falls back to the implementation in
L<Moose::Meta::TypeConstraint>.
=item B<< $constraint->create_child_type(%options) >>
This returns a new L<Moose::Meta::TypeConstraint> object with the type
as its parent.
Note that it does I<not> return a
C<Moose::Meta::TypeConstraint::Class> object!
=item B<< $constraint->get_message($value) >>
This is the same as L<Moose::Meta::TypeConstraint/get_message> except
that it explicitly says C<isa> was checked. This is to help users deal
with accidentally autovivified type constraints.
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Yuval Kogman E<lt>nothingmuch@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
