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1 | package MooseX::Types::UndefinedType; |
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2 | |
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3 | use warnings; |
4 | use strict; |
5 | |
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6 | use Moose::Util::TypeConstraints (); |
7 | use Carp::Clan qw( ^MooseX::Types ); |
8 | |
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9 | use overload '""' => sub { shift->name }, |
10 | fallback => 1; |
11 | |
12 | =head1 DESCRIPTION |
13 | |
14 | Whenever a type handle function (e.g. C<Int()> can't find a type |
15 | constraint under it's full name, it assumes it has not yet been defined. |
16 | It will then return an instance of this class, handling only |
17 | stringification, name and possible identification of undefined types. |
18 | |
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19 | Later, when you try to use the Undefined Type Constraint, autovivification will |
20 | be attempted. |
21 | |
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22 | =head1 METHODS |
23 | |
24 | =head2 new |
25 | |
26 | Takes a full type name as argument and returns an instance of this |
27 | class. |
28 | |
29 | =cut |
30 | |
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31 | sub new { |
32 | return bless { name => $_[1] }, $_[0]; |
33 | } |
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34 | |
35 | =head2 name |
36 | |
37 | Returns the stored type name. |
38 | |
39 | =cut |
40 | |
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41 | sub name { |
42 | return $_[0]->{name}; |
43 | } |
44 | |
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45 | =head2 can_be_inlined |
46 | |
47 | Always returns false. Needed for compatbility with Moose 2.0100+. |
48 | |
49 | =cut |
50 | |
51 | sub can_be_inlined { 0 } |
52 | |
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53 | =head2 __autovivify |
54 | |
55 | Try to see if the type constraint has yet been defined and if so create it. |
56 | |
57 | =cut |
58 | |
59 | sub __autovivify { |
60 | my ($self) = @_; |
61 | if(my $tc = $self->{instance}) { |
62 | return $tc; |
63 | } elsif( my $new_tc = Moose::Util::TypeConstraints::find_type_constraint($self->name)) { |
64 | $self->{instance} = $new_tc; |
65 | return $new_tc; |
66 | } else { |
67 | return; |
68 | } |
69 | } |
70 | |
71 | =head2 AUTOLOAD |
72 | |
73 | Try to autovivify and delegate |
74 | |
75 | =cut |
76 | |
77 | sub AUTOLOAD { |
78 | my ($self, @args) = @_; |
79 | my ($method) = our $AUTOLOAD =~ /([^:]+)$/; |
80 | |
81 | if(my $type_constraint = $self->__autovivify) { |
82 | return $type_constraint->$method(@args); |
83 | } else { |
84 | croak "Method '$method' is not supported for " . $self->name; |
85 | } |
86 | } |
87 | |
88 | =head2 DESTROY |
89 | |
90 | Moose::Meta::TypeConstraint::Parameterizable complains if this isn't here. TODO |
91 | to find out why. |
92 | |
93 | =cut |
94 | |
95 | sub DESTROY { |
96 | return; |
97 | } |
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98 | |
99 | =head1 SEE ALSO |
100 | |
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101 | L<MooseX::Types::Moose>, |
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102 | L<Moose::Util::TypeConstraints>, |
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103 | L<Moose::Meta::TypeConstraint>, |
104 | L<Carp::Clan> |
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105 | |
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106 | =head1 LICENSE |
107 | |
108 | This program is free software; you can redistribute it and/or modify |
109 | it under the same terms as perl itself. |
110 | |
111 | =cut |
112 | |
113 | |
114 | 1; |