Commit | Line | Data |
52d358e2 |
1 | package MooseX::Types::UndefinedType; |
e211870f |
2 | |
3 | =head1 NAME |
4 | |
52d358e2 |
5 | MooseX::Types::UndefinedType - Represents a not yet defined type |
e211870f |
6 | |
7 | =cut |
8 | |
9 | use warnings; |
10 | use strict; |
11 | |
077ac262 |
12 | use Moose::Util::TypeConstraints (); |
13 | use Carp::Clan qw( ^MooseX::Types ); |
14 | |
e211870f |
15 | use overload '""' => sub { shift->name }, |
16 | fallback => 1; |
17 | |
18 | =head1 DESCRIPTION |
19 | |
20 | Whenever a type handle function (e.g. C<Int()> can't find a type |
21 | constraint under it's full name, it assumes it has not yet been defined. |
22 | It will then return an instance of this class, handling only |
23 | stringification, name and possible identification of undefined types. |
24 | |
077ac262 |
25 | Later, when you try to use the Undefined Type Constraint, autovivification will |
26 | be attempted. |
27 | |
e211870f |
28 | =head1 METHODS |
29 | |
30 | =head2 new |
31 | |
32 | Takes a full type name as argument and returns an instance of this |
33 | class. |
34 | |
35 | =cut |
36 | |
077ac262 |
37 | sub new { |
38 | return bless { name => $_[1] }, $_[0]; |
39 | } |
e211870f |
40 | |
41 | =head2 name |
42 | |
43 | Returns the stored type name. |
44 | |
45 | =cut |
46 | |
077ac262 |
47 | sub name { |
48 | return $_[0]->{name}; |
49 | } |
50 | |
51 | =head2 __autovivify |
52 | |
53 | Try to see if the type constraint has yet been defined and if so create it. |
54 | |
55 | =cut |
56 | |
57 | sub __autovivify { |
58 | my ($self) = @_; |
59 | if(my $tc = $self->{instance}) { |
60 | return $tc; |
61 | } elsif( my $new_tc = Moose::Util::TypeConstraints::find_type_constraint($self->name)) { |
62 | $self->{instance} = $new_tc; |
63 | return $new_tc; |
64 | } else { |
65 | return; |
66 | } |
67 | } |
68 | |
69 | =head2 AUTOLOAD |
70 | |
71 | Try to autovivify and delegate |
72 | |
73 | =cut |
74 | |
75 | sub AUTOLOAD { |
76 | my ($self, @args) = @_; |
77 | my ($method) = our $AUTOLOAD =~ /([^:]+)$/; |
78 | |
79 | if(my $type_constraint = $self->__autovivify) { |
80 | return $type_constraint->$method(@args); |
81 | } else { |
82 | croak "Method '$method' is not supported for " . $self->name; |
83 | } |
84 | } |
85 | |
86 | =head2 DESTROY |
87 | |
88 | Moose::Meta::TypeConstraint::Parameterizable complains if this isn't here. TODO |
89 | to find out why. |
90 | |
91 | =cut |
92 | |
93 | sub DESTROY { |
94 | return; |
95 | } |
e211870f |
96 | |
97 | =head1 SEE ALSO |
98 | |
52d358e2 |
99 | L<MooseX::Types::Moose>, |
e211870f |
100 | L<Moose::Util::TypeConstraints>, |
077ac262 |
101 | L<Moose::Meta::TypeConstraint>, |
102 | L<Carp::Clan> |
e211870f |
103 | |
104 | =head1 AUTHOR AND COPYRIGHT |
105 | |
106 | Robert 'phaylon' Sedlacek C<E<lt>rs@474.atE<gt>>, with many thanks to |
107 | the C<#moose> cabal on C<irc.perl.org>. |
108 | |
077ac262 |
109 | Additional features by John Napiorkowski (jnapiorkowski) <jjnapiork@cpan.org> |
110 | |
e211870f |
111 | =head1 LICENSE |
112 | |
113 | This program is free software; you can redistribute it and/or modify |
114 | it under the same terms as perl itself. |
115 | |
116 | =cut |
117 | |
118 | |
119 | 1; |