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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 $_[0]->{name}; |
43 | } |
44 | |
45 | =head2 __autovivify |
46 | |
47 | Try to see if the type constraint has yet been defined and if so create it. |
48 | |
49 | =cut |
50 | |
51 | sub __autovivify { |
52 | my ($self) = @_; |
53 | if(my $tc = $self->{instance}) { |
54 | return $tc; |
55 | } elsif( my $new_tc = Moose::Util::TypeConstraints::find_type_constraint($self->name)) { |
56 | $self->{instance} = $new_tc; |
57 | return $new_tc; |
58 | } else { |
59 | return; |
60 | } |
61 | } |
62 | |
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63 | =head2 can_be_inlined |
64 | |
65 | Make sure that if a type hasn't been defined yet when Moose wants to inline it, |
66 | we don't allow inlining. |
67 | |
68 | =cut |
69 | |
70 | sub can_be_inlined { |
71 | my $self = shift; |
72 | if(my $type_constraint = $self->__autovivify) { |
73 | return $type_constraint->can_be_inlined; |
74 | } else { |
75 | return; |
76 | } |
77 | } |
78 | |
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79 | =head2 AUTOLOAD |
80 | |
81 | Try to autovivify and delegate |
82 | |
83 | =cut |
84 | |
85 | sub AUTOLOAD { |
86 | my ($self, @args) = @_; |
87 | my ($method) = our $AUTOLOAD =~ /([^:]+)$/; |
88 | |
89 | if(my $type_constraint = $self->__autovivify) { |
90 | return $type_constraint->$method(@args); |
91 | } else { |
92 | croak "Method '$method' is not supported for " . $self->name; |
93 | } |
94 | } |
95 | |
96 | =head2 DESTROY |
97 | |
98 | Moose::Meta::TypeConstraint::Parameterizable complains if this isn't here. TODO |
99 | to find out why. |
100 | |
101 | =cut |
102 | |
103 | sub DESTROY { |
104 | return; |
105 | } |
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106 | |
107 | =head1 SEE ALSO |
108 | |
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109 | L<MooseX::Types::Moose>, |
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110 | L<Moose::Util::TypeConstraints>, |
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111 | L<Moose::Meta::TypeConstraint>, |
112 | L<Carp::Clan> |
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113 | |
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114 | =head1 LICENSE |
115 | |
116 | This program is free software; you can redistribute it and/or modify |
117 | it under the same terms as perl itself. |
118 | |
119 | =cut |
120 | |
121 | |
122 | 1; |