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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 | |
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11 | our $VERSION = '0.71_01'; |
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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; |
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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); |
70ea9161 |
46 | |
47 | unless ( defined $type_constraint ) { |
48 | require Moose; |
49 | Moose->throw_error("Could not find the type constraint ($constraint_name) to coerce from"); |
50 | } |
51 | |
e95c7c42 |
52 | push @coercions => [ |
53 | $type_constraint->_compiled_type_constraint, |
54 | $action |
55 | ]; |
a27aa600 |
56 | } |
57 | $self->_compiled_type_coercion(sub { |
58 | my $thing = shift; |
59 | foreach my $coercion (@coercions) { |
60 | my ($constraint, $converter) = @$coercion; |
42bc21a4 |
61 | if ($constraint->($thing)) { |
6f9ff1af |
62 | local $_ = $thing; |
a27aa600 |
63 | return $converter->($thing); |
64 | } |
65 | } |
66 | return $thing; |
67 | }); |
68 | } |
69 | |
41e007e4 |
70 | sub has_coercion_for_type { |
71 | my ($self, $type_name) = @_; |
72 | my %coercion_map = @{$self->type_coercion_map}; |
73 | exists $coercion_map{$type_name} ? 1 : 0; |
74 | } |
75 | |
76 | sub add_type_coercions { |
77 | my ($self, @new_coercion_map) = @_; |
78 | |
79 | my $coercion_map = $self->type_coercion_map; |
80 | my %has_coercion = @$coercion_map; |
81 | |
82 | while (@new_coercion_map) { |
83 | my ($constraint_name, $action) = splice(@new_coercion_map, 0, 2); |
70ea9161 |
84 | |
85 | if ( exists $has_coercion{$constraint_name} ) { |
86 | require Moose; |
87 | Moose->throw_error("A coercion action already exists for '$constraint_name'") |
88 | } |
89 | |
41e007e4 |
90 | push @{$coercion_map} => ($constraint_name, $action); |
91 | } |
92 | |
93 | # and re-compile ... |
94 | $self->compile_type_coercion; |
95 | } |
96 | |
a27aa600 |
97 | sub coerce { $_[0]->_compiled_type_coercion->($_[1]) } |
98 | |
99 | |
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100 | 1; |
101 | |
102 | __END__ |
103 | |
104 | =pod |
105 | |
106 | =head1 NAME |
107 | |
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108 | Moose::Meta::TypeCoercion - The Moose Type Coercion metaclass |
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109 | |
110 | =head1 DESCRIPTION |
111 | |
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112 | For the most part, the only time you will ever encounter an |
113 | instance of this class is if you are doing some serious deep |
114 | introspection. This API should not be considered final, but |
115 | it is B<highly unlikely> that this will matter to a regular |
116 | Moose user. |
117 | |
118 | If you wish to use features at this depth, please come to the |
119 | #moose IRC channel on irc.perl.org and we can talk :) |
120 | |
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121 | =head1 METHODS |
122 | |
123 | =over 4 |
124 | |
125 | =item B<meta> |
126 | |
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127 | =item B<new> |
128 | |
a27aa600 |
129 | =item B<compile_type_coercion> |
130 | |
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131 | =item B<coerce> |
132 | |
a27aa600 |
133 | =item B<type_coercion_map> |
134 | |
135 | =item B<type_constraint> |
136 | |
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137 | =item B<has_coercion_for_type> |
138 | |
139 | =item B<add_type_coercions> |
140 | |
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141 | =back |
142 | |
143 | =head1 BUGS |
144 | |
145 | All complex software has bugs lurking in it, and this module is no |
146 | exception. If you find a bug please either email me, or add the bug |
147 | to cpan-RT. |
148 | |
149 | =head1 AUTHOR |
150 | |
151 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
152 | |
153 | =head1 COPYRIGHT AND LICENSE |
154 | |
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155 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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156 | |
157 | L<http://www.iinteractive.com> |
158 | |
159 | This library is free software; you can redistribute it and/or modify |
160 | it under the same terms as Perl itself. |
161 | |
42bc21a4 |
162 | =cut |