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1 | |
2 | package Moose::Meta::TypeCoercion; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | use metaclass; |
7 | |
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8 | use Moose::Meta::Attribute; |
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9 | use Moose::Util::TypeConstraints (); |
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10 | |
d344c3fe |
11 | our $VERSION = '0.68'; |
e606ae5f |
12 | $VERSION = eval $VERSION; |
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13 | our $AUTHORITY = 'cpan:STEVAN'; |
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14 | |
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15 | __PACKAGE__->meta->add_attribute('type_coercion_map' => ( |
16 | reader => 'type_coercion_map', |
17 | default => sub { [] } |
18 | )); |
d44714be |
19 | |
a27aa600 |
20 | __PACKAGE__->meta->add_attribute( |
21 | Moose::Meta::Attribute->new('type_constraint' => ( |
22 | reader => 'type_constraint', |
23 | weak_ref => 1 |
24 | )) |
25 | ); |
26 | |
27 | # private accessor |
28 | __PACKAGE__->meta->add_attribute('compiled_type_coercion' => ( |
29 | accessor => '_compiled_type_coercion' |
30 | )); |
31 | |
32 | sub new { |
33 | my $class = shift; |
34 | my $self = $class->meta->new_object(@_); |
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35 | $self->compile_type_coercion; |
a27aa600 |
36 | return $self; |
37 | } |
38 | |
39 | sub compile_type_coercion { |
40 | my $self = shift; |
41 | my @coercion_map = @{$self->type_coercion_map}; |
42 | my @coercions; |
43 | while (@coercion_map) { |
44 | my ($constraint_name, $action) = splice(@coercion_map, 0, 2); |
9c637fca |
45 | my $type_constraint = ref $constraint_name ? $constraint_name : Moose::Util::TypeConstraints::find_or_parse_type_constraint($constraint_name); |
e95c7c42 |
46 | (defined $type_constraint) |
c245d69b |
47 | || Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from"); |
e95c7c42 |
48 | push @coercions => [ |
49 | $type_constraint->_compiled_type_constraint, |
50 | $action |
51 | ]; |
a27aa600 |
52 | } |
53 | $self->_compiled_type_coercion(sub { |
54 | my $thing = shift; |
55 | foreach my $coercion (@coercions) { |
56 | my ($constraint, $converter) = @$coercion; |
42bc21a4 |
57 | if ($constraint->($thing)) { |
6f9ff1af |
58 | local $_ = $thing; |
a27aa600 |
59 | return $converter->($thing); |
60 | } |
61 | } |
62 | return $thing; |
63 | }); |
64 | } |
65 | |
41e007e4 |
66 | sub has_coercion_for_type { |
67 | my ($self, $type_name) = @_; |
68 | my %coercion_map = @{$self->type_coercion_map}; |
69 | exists $coercion_map{$type_name} ? 1 : 0; |
70 | } |
71 | |
72 | sub add_type_coercions { |
73 | my ($self, @new_coercion_map) = @_; |
74 | |
75 | my $coercion_map = $self->type_coercion_map; |
76 | my %has_coercion = @$coercion_map; |
77 | |
78 | while (@new_coercion_map) { |
79 | my ($constraint_name, $action) = splice(@new_coercion_map, 0, 2); |
80 | |
c245d69b |
81 | Moose->throw_error("A coercion action already exists for '$constraint_name'") |
41e007e4 |
82 | if exists $has_coercion{$constraint_name}; |
83 | |
84 | push @{$coercion_map} => ($constraint_name, $action); |
85 | } |
86 | |
87 | # and re-compile ... |
88 | $self->compile_type_coercion; |
89 | } |
90 | |
a27aa600 |
91 | sub coerce { $_[0]->_compiled_type_coercion->($_[1]) } |
92 | |
93 | |
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94 | 1; |
95 | |
96 | __END__ |
97 | |
98 | =pod |
99 | |
100 | =head1 NAME |
101 | |
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102 | Moose::Meta::TypeCoercion - The Moose Type Coercion metaclass |
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103 | |
104 | =head1 DESCRIPTION |
105 | |
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106 | For the most part, the only time you will ever encounter an |
107 | instance of this class is if you are doing some serious deep |
108 | introspection. This API should not be considered final, but |
109 | it is B<highly unlikely> that this will matter to a regular |
110 | Moose user. |
111 | |
112 | If you wish to use features at this depth, please come to the |
113 | #moose IRC channel on irc.perl.org and we can talk :) |
114 | |
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115 | =head1 METHODS |
116 | |
117 | =over 4 |
118 | |
119 | =item B<meta> |
120 | |
a27aa600 |
121 | =item B<new> |
122 | |
a27aa600 |
123 | =item B<compile_type_coercion> |
124 | |
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125 | =item B<coerce> |
126 | |
a27aa600 |
127 | =item B<type_coercion_map> |
128 | |
129 | =item B<type_constraint> |
130 | |
41e007e4 |
131 | =item B<has_coercion_for_type> |
132 | |
133 | =item B<add_type_coercions> |
134 | |
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135 | =back |
136 | |
137 | =head1 BUGS |
138 | |
139 | All complex software has bugs lurking in it, and this module is no |
140 | exception. If you find a bug please either email me, or add the bug |
141 | to cpan-RT. |
142 | |
143 | =head1 AUTHOR |
144 | |
145 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
146 | |
147 | =head1 COPYRIGHT AND LICENSE |
148 | |
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149 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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150 | |
151 | L<http://www.iinteractive.com> |
152 | |
153 | This library is free software; you can redistribute it and/or modify |
154 | it under the same terms as Perl itself. |
155 | |
42bc21a4 |
156 | =cut |