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1 | |
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2 | package Moose::Meta::Attribute::Native::Trait; |
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3 | use Moose::Role; |
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4 | |
5 | use List::MoreUtils qw( any ); |
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6 | use Moose::Util::TypeConstraints; |
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7 | use Moose::Deprecated; |
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8 | |
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9 | our $VERSION = '1.15'; |
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10 | $VERSION = eval $VERSION; |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
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13 | requires '_helper_type'; |
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14 | |
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15 | before '_process_options' => sub { |
16 | my ( $self, $name, $options ) = @_; |
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17 | |
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18 | $self->_check_helper_type( $options, $name ); |
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19 | |
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20 | if ( !( any { exists $options->{$_} } qw( is reader writer accessor ) ) |
21 | && $self->can('_default_is') ) { |
22 | |
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23 | $options->{is} = $self->_default_is; |
24 | |
25 | Moose::Deprecated::deprecated( |
26 | feature => 'default is for Native Trait', |
27 | message => |
28 | q{Allowing a native trait to automatically supply a value for "is" is deprecated} |
29 | ); |
30 | } |
31 | |
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32 | if ( |
33 | !( |
34 | $options->{required} |
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35 | || any { exists $options->{$_} } qw( default builder lazy_build ) |
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36 | ) |
37 | && $self->can('_default_default') |
38 | ) { |
39 | |
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40 | $options->{default} = $self->_default_default; |
41 | |
42 | Moose::Deprecated::deprecated( |
43 | feature => 'default default for Native Trait', |
44 | message => |
45 | 'Allowing a native trait to automatically supply a default is deprecated' |
46 | ); |
47 | } |
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48 | }; |
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49 | |
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50 | sub _check_helper_type { |
51 | my ( $self, $options, $name ) = @_; |
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52 | |
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53 | my $type = $self->_helper_type; |
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54 | |
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55 | $options->{isa} = $type |
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56 | unless exists $options->{isa}; |
57 | |
58 | my $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint( |
59 | $options->{isa} ); |
60 | |
61 | ( $isa->is_a_type_of($type) ) |
62 | || confess |
63 | "The type constraint for $name must be a subtype of $type but it's a $isa"; |
64 | } |
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65 | |
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66 | before 'install_accessors' => sub { (shift)->_check_handles_values }; |
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67 | |
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68 | sub _check_handles_values { |
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69 | my $self = shift; |
70 | |
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71 | my %handles = $self->_canonicalize_handles; |
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72 | |
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73 | for my $original_method ( values %handles ) { |
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74 | my $name = $original_method->[0]; |
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75 | |
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76 | my $accessor_class = $self->_native_accessor_class_for($name); |
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77 | |
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78 | ( $accessor_class && $accessor_class->can('new') ) |
79 | || confess |
80 | "$name is an unsupported method type - $accessor_class"; |
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81 | } |
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82 | } |
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83 | |
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84 | around '_canonicalize_handles' => sub { |
85 | shift; |
86 | my $self = shift; |
87 | my $handles = $self->handles; |
88 | |
89 | return unless $handles; |
90 | |
91 | unless ( 'HASH' eq ref $handles ) { |
92 | $self->throw_error( |
93 | "The 'handles' option must be a HASH reference, not $handles"); |
94 | } |
95 | |
96 | return map { |
97 | my $to = $handles->{$_}; |
98 | $to = [$to] unless ref $to; |
99 | $_ => $to |
100 | } keys %$handles; |
101 | }; |
102 | |
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103 | around '_make_delegation_method' => sub { |
104 | my $next = shift; |
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105 | my ( $self, $handle_name, $method_to_call ) = @_; |
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106 | |
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107 | my ( $name, @curried_args ) = @$method_to_call; |
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108 | |
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109 | my $accessor_class = $self->_native_accessor_class_for($name); |
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110 | |
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111 | die "Cannot find an accessor class for $name" |
112 | unless $accessor_class && $accessor_class->can('new'); |
113 | |
114 | return $accessor_class->new( |
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115 | name => $handle_name, |
116 | package_name => $self->associated_class->name, |
117 | delegate_to_method => $name, |
118 | attribute => $self, |
119 | is_inline => 1, |
120 | curried_arguments => \@curried_args, |
121 | root_types => [ $self->_root_types ], |
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122 | ); |
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123 | }; |
124 | |
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125 | sub _root_types { |
126 | return $_[0]->_helper_type; |
127 | } |
128 | |
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129 | sub _native_accessor_class_for { |
130 | my ( $self, $suffix ) = @_; |
131 | |
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132 | my $role |
133 | = 'Moose::Meta::Method::Accessor::Native::' |
134 | . $self->_native_type . '::' |
135 | . $suffix; |
136 | |
137 | return Moose::Meta::Class->create_anon_class( |
138 | superclasses => |
139 | [ $self->accessor_metaclass, $self->delegation_metaclass ], |
140 | roles => [$role], |
141 | cache => 1, |
142 | )->name; |
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143 | } |
144 | |
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145 | sub _build_native_type { |
146 | my $self = shift; |
147 | |
148 | for my $role_name ( map { $_->name } $self->meta->calculate_all_roles ) { |
149 | return $1 if $role_name =~ /::Native::Trait::(\w+)$/; |
150 | } |
151 | |
152 | die "Cannot calculate native type for " . ref $self; |
153 | } |
154 | |
155 | has '_native_type' => ( |
156 | is => 'ro', |
157 | isa => 'Str', |
158 | lazy => 1, |
159 | builder => '_build_native_type', |
160 | ); |
161 | |
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162 | no Moose::Role; |
163 | no Moose::Util::TypeConstraints; |
164 | |
165 | 1; |
166 | |
167 | __END__ |
168 | |
169 | =head1 NAME |
170 | |
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171 | Moose::Meta::Attribute::Native::Trait - Shared role for native delegation traits |
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172 | |
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173 | =head1 BUGS |
174 | |
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175 | See L<Moose/BUGS> for details on reporting bugs. |
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176 | |
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177 | =head1 SEE ALSO |
178 | |
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179 | Documentation for Moose native traits can be found in |
180 | L<Moose::Meta::Attribute::Native>. |
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181 | |
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182 | =head1 AUTHORS |
183 | |
184 | Yuval Kogman |
185 | |
186 | Shawn M Moore |
187 | |
188 | Jesse Luehrs |
189 | |
190 | =head1 COPYRIGHT AND LICENSE |
191 | |
192 | Copyright 2007-2009 by Infinity Interactive, Inc. |
193 | |
194 | L<http://www.iinteractive.com> |
195 | |
196 | This library is free software; you can redistribute it and/or modify |
197 | it under the same terms as Perl itself. |
198 | |
199 | =cut |