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1 | |
2 | package Moose::Meta::TypeCoercion::Union; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
8 | use Carp 'confess'; |
9 | use Scalar::Util 'blessed'; |
10 | |
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11 | our $VERSION = '0.56'; |
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12 | $VERSION = eval $VERSION; |
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13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
15 | use base 'Moose::Meta::TypeCoercion'; |
16 | |
17 | sub compile_type_coercion { |
18 | my $self = shift; |
19 | my $type_constraint = $self->type_constraint; |
20 | |
21 | (blessed $type_constraint && $type_constraint->isa('Moose::Meta::TypeConstraint::Union')) |
22 | || confess "You can only a Moose::Meta::TypeCoercion::Union for a " . |
23 | "Moose::Meta::TypeConstraint::Union, not a $type_constraint"; |
24 | |
25 | $self->_compiled_type_coercion(sub { |
26 | my $value = shift; |
27 | # go through all the type constraints |
28 | # in the union, and check em ... |
29 | foreach my $type (@{$type_constraint->type_constraints}) { |
30 | # if they have a coercion first |
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31 | if ($type->has_coercion) { |
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32 | # then try to coerce them ... |
33 | my $temp = $type->coerce($value); |
34 | # and if they get something |
35 | # make sure it still fits within |
36 | # the union type ... |
37 | return $temp if $type_constraint->check($temp); |
38 | } |
39 | } |
40 | return undef; |
41 | }); |
42 | } |
43 | |
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44 | sub has_coercion_for_type { 0 } |
45 | |
46 | sub add_type_coercions { |
47 | confess "Cannot add additional type coercions to Union types"; |
48 | } |
49 | |
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50 | 1; |
51 | |
52 | __END__ |
53 | |
54 | =pod |
55 | |
56 | =head1 NAME |
57 | |
58 | Moose::Meta::TypeCoercion::Union - The Moose Type Coercion metaclass for Unions |
59 | |
60 | =head1 DESCRIPTION |
61 | |
62 | For the most part, the only time you will ever encounter an |
63 | instance of this class is if you are doing some serious deep |
64 | introspection. This API should not be considered final, but |
65 | it is B<highly unlikely> that this will matter to a regular |
66 | Moose user. |
67 | |
68 | If you wish to use features at this depth, please come to the |
69 | #moose IRC channel on irc.perl.org and we can talk :) |
70 | |
71 | =head1 METHODS |
72 | |
73 | =over 4 |
74 | |
75 | =item B<meta> |
76 | |
77 | =item B<compile_type_coercion> |
78 | |
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79 | =item B<has_coercion_for_type> |
80 | |
81 | =item B<add_type_coercions> |
82 | |
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83 | =back |
84 | |
85 | =head1 BUGS |
86 | |
87 | All complex software has bugs lurking in it, and this module is no |
88 | exception. If you find a bug please either email me, or add the bug |
89 | to cpan-RT. |
90 | |
91 | =head1 AUTHOR |
92 | |
93 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
94 | |
95 | =head1 COPYRIGHT AND LICENSE |
96 | |
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97 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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98 | |
99 | L<http://www.iinteractive.com> |
100 | |
101 | This library is free software; you can redistribute it and/or modify |
102 | it under the same terms as Perl itself. |
103 | |
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104 | =cut |