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1 | package Moose::Util; |
2 | |
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3 | use strict; |
4 | use warnings; |
5 | |
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6 | use Sub::Exporter; |
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7 | use Scalar::Util 'blessed'; |
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8 | use Class::MOP 0.60; |
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9 | |
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10 | our $VERSION = '0.72'; |
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11 | $VERSION = eval $VERSION; |
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12 | our $AUTHORITY = 'cpan:STEVAN'; |
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13 | |
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14 | my @exports = qw[ |
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15 | find_meta |
16 | does_role |
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17 | search_class_by_role |
d7d8a8c7 |
18 | apply_all_roles |
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19 | get_all_init_args |
20 | get_all_attribute_values |
a5e883ae |
21 | resolve_metatrait_alias |
22 | resolve_metaclass_alias |
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23 | add_method_modifier |
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24 | english_list |
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25 | ]; |
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26 | |
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27 | Sub::Exporter::setup_exporter({ |
28 | exports => \@exports, |
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29 | groups => { all => \@exports } |
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30 | }); |
31 | |
32 | ## some utils for the utils ... |
33 | |
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34 | sub find_meta { |
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35 | return unless $_[0]; |
d7d8a8c7 |
36 | return Class::MOP::get_metaclass_by_name(blessed($_[0]) || $_[0]); |
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37 | } |
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38 | |
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39 | ## the functions ... |
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40 | |
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41 | sub does_role { |
42 | my ($class_or_obj, $role) = @_; |
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43 | |
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44 | my $meta = find_meta($class_or_obj); |
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45 | |
46 | return unless defined $meta; |
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47 | return unless $meta->can('does_role'); |
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48 | return 1 if $meta->does_role($role); |
49 | return; |
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50 | } |
51 | |
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52 | sub search_class_by_role { |
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53 | my ($class_or_obj, $role_name) = @_; |
54 | |
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55 | my $meta = find_meta($class_or_obj); |
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56 | |
57 | return unless defined $meta; |
58 | |
59 | foreach my $class ($meta->class_precedence_list) { |
60 | |
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61 | my $_meta = find_meta($class); |
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62 | |
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63 | next unless defined $_meta; |
64 | |
65 | foreach my $role (@{ $_meta->roles || [] }) { |
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66 | return $class if $role->name eq $role_name; |
67 | } |
68 | } |
69 | |
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70 | return; |
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71 | } |
72 | |
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73 | sub apply_all_roles { |
74 | my $applicant = shift; |
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75 | |
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76 | unless (@_) { |
77 | require Moose; |
78 | Moose->throw_error("Must specify at least one role to apply to $applicant"); |
79 | } |
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80 | |
81 | my $roles = Data::OptList::mkopt( [@_] ); |
82 | |
83 | my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) ); |
84 | |
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85 | foreach my $role_spec (@$roles) { |
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86 | Class::MOP::load_class( $role_spec->[0] ); |
9c10b5ad |
87 | } |
d7d8a8c7 |
88 | |
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89 | foreach my $role (@$roles) { |
90 | unless ( $role->[0]->can('meta') |
91 | && $role->[0]->meta->isa('Moose::Meta::Role') ) { |
92 | |
93 | require Moose; |
94 | Moose->throw_error( "You can only consume roles, " |
95 | . $role->[0] |
96 | . " is not a Moose role" ); |
97 | } |
98 | } |
e606ae5f |
99 | |
100 | if ( scalar @$roles == 1 ) { |
101 | my ( $role, $params ) = @{ $roles->[0] }; |
102 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
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103 | } |
104 | else { |
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105 | Moose::Meta::Role->combine( @$roles )->apply($meta); |
106 | } |
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107 | } |
108 | |
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109 | # instance deconstruction ... |
110 | |
111 | sub get_all_attribute_values { |
112 | my ($class, $instance) = @_; |
113 | return +{ |
114 | map { $_->name => $_->get_value($instance) } |
115 | grep { $_->has_value($instance) } |
116 | $class->compute_all_applicable_attributes |
117 | }; |
118 | } |
119 | |
120 | sub get_all_init_args { |
121 | my ($class, $instance) = @_; |
122 | return +{ |
123 | map { $_->init_arg => $_->get_value($instance) } |
124 | grep { $_->has_value($instance) } |
125 | grep { defined($_->init_arg) } |
126 | $class->compute_all_applicable_attributes |
127 | }; |
128 | } |
129 | |
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130 | sub resolve_metatrait_alias { |
50fbbf3d |
131 | return resolve_metaclass_alias( @_, trait => 1 ); |
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132 | } |
133 | |
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134 | { |
135 | my %cache; |
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136 | |
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137 | sub resolve_metaclass_alias { |
138 | my ( $type, $metaclass_name, %options ) = @_; |
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139 | |
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140 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); |
141 | return $cache{$cache_key}{$metaclass_name} |
142 | if $cache{$cache_key}{$metaclass_name}; |
143 | |
144 | my $possible_full_name |
145 | = 'Moose::Meta::' |
146 | . $type |
147 | . '::Custom::' |
148 | . ( $options{trait} ? "Trait::" : "" ) |
149 | . $metaclass_name; |
150 | |
151 | my $loaded_class = Class::MOP::load_first_existing_class( |
152 | $possible_full_name, |
153 | $metaclass_name |
154 | ); |
155 | |
156 | return $cache{$cache_key}{$metaclass_name} |
157 | = $loaded_class->can('register_implementation') |
158 | ? $loaded_class->register_implementation |
159 | : $loaded_class; |
160 | } |
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161 | } |
162 | |
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163 | sub add_method_modifier { |
164 | my ( $class_or_obj, $modifier_name, $args ) = @_; |
165 | my $meta = find_meta($class_or_obj); |
166 | my $code = pop @{$args}; |
167 | my $add_modifier_method = 'add_' . $modifier_name . '_method_modifier'; |
168 | if ( my $method_modifier_type = ref( @{$args}[0] ) ) { |
169 | if ( $method_modifier_type eq 'Regexp' ) { |
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170 | my @all_methods = $meta->get_all_methods; |
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171 | my @matched_methods |
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172 | = grep { $_->name =~ @{$args}[0] } @all_methods; |
173 | $meta->$add_modifier_method( $_->name, $code ) |
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174 | for @matched_methods; |
175 | } |
176 | } |
177 | else { |
178 | $meta->$add_modifier_method( $_, $code ) for @{$args}; |
179 | } |
180 | } |
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181 | |
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182 | sub english_list { |
183 | my @items = sort @_; |
184 | |
185 | return $items[0] if @items == 1; |
186 | return "$items[0] and $items[1]" if @items == 2; |
187 | |
188 | my $tail = pop @items; |
189 | my $list = join ', ', @items; |
190 | $list .= ', and ' . $tail; |
191 | |
192 | return $list; |
193 | } |
194 | |
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195 | 1; |
196 | |
197 | __END__ |
198 | |
199 | =pod |
200 | |
201 | =head1 NAME |
202 | |
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203 | Moose::Util - Utilities for working with Moose classes |
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204 | |
205 | =head1 SYNOPSIS |
206 | |
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207 | use Moose::Util qw/find_meta does_role search_class_by_role/; |
208 | |
209 | my $meta = find_meta($object) || die "No metaclass found"; |
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210 | |
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211 | if (does_role($object, $role)) { |
212 | print "The object can do $role!\n"; |
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213 | } |
214 | |
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215 | my $class = search_class_by_role($object, 'FooRole'); |
216 | print "Nearest class with 'FooRole' is $class\n"; |
217 | |
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218 | =head1 DESCRIPTION |
219 | |
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220 | This is a set of utility functions to help working with Moose classes, and |
221 | is used internally by Moose itself. The goal is to provide useful functions |
222 | that for both Moose users and Moose extenders (MooseX:: authors). |
223 | |
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224 | This is a relatively new addition to the Moose tool chest, so ideas, |
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225 | suggestions and contributions to this collection are most welcome. |
226 | See the L<TODO> section below for a list of ideas for possible functions |
227 | to write. |
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228 | |
229 | =head1 EXPORTED FUNCTIONS |
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230 | |
231 | =over 4 |
232 | |
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233 | =item B<find_meta ($class_or_obj)> |
234 | |
235 | This will attempt to locate a metaclass for the given C<$class_or_obj> |
236 | and return it. |
237 | |
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238 | =item B<does_role ($class_or_obj, $role_name)> |
239 | |
240 | Returns true if C<$class_or_obj> can do the role C<$role_name>. |
241 | |
242 | =item B<search_class_by_role ($class_or_obj, $role_name)> |
243 | |
244 | Returns first class in precedence list that consumed C<$role_name>. |
245 | |
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246 | =item B<apply_all_roles ($applicant, @roles)> |
247 | |
248 | Given an C<$applicant> (which can somehow be turned into either a |
249 | metaclass or a metarole) and a list of C<@roles> this will do the |
250 | right thing to apply the C<@roles> to the C<$applicant>. This is |
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251 | actually used internally by both L<Moose> and L<Moose::Role>, and the |
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252 | C<@roles> will be preprocessed through L<Data::OptList::mkopt> |
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253 | to allow for the additional arguments to be passed. |
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254 | |
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255 | =item B<get_all_attribute_values($meta, $instance)> |
256 | |
257 | Returns the values of the C<$instance>'s fields keyed by the attribute names. |
258 | |
259 | =item B<get_all_init_args($meta, $instance)> |
260 | |
261 | Returns a hash reference where the keys are all the attributes' C<init_arg>s |
262 | and the values are the instance's fields. Attributes without an C<init_arg> |
263 | will be skipped. |
264 | |
a3738e5b |
265 | =item B<resolve_metaclass_alias($category, $name, %options)> |
266 | |
267 | =item B<resolve_metatrait_alias($category, $name, %options)> |
268 | |
269 | Resolve a short name like in e.g. |
270 | |
271 | has foo => ( |
272 | metaclass => "Bar", |
273 | ); |
274 | |
275 | to a full class name. |
276 | |
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277 | =item B<add_method_modifier ($class_or_obj, $modifier_name, $args)> |
278 | |
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279 | =item B<english_list(@items)> |
280 | |
281 | Given a list of scalars, turns them into a proper list in English |
282 | ("one and two", "one, two, three, and four"). This is used to help us |
283 | make nicer error messages. |
284 | |
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285 | =back |
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286 | |
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287 | =head1 TODO |
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288 | |
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289 | Here is a list of possible functions to write |
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290 | |
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291 | =over 4 |
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292 | |
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293 | =item discovering original method from modified method |
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294 | |
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295 | =item search for origin class of a method or attribute |
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296 | |
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297 | =back |
298 | |
299 | =head1 BUGS |
300 | |
301 | All complex software has bugs lurking in it, and this module is no |
302 | exception. If you find a bug please either email me, or add the bug |
303 | to cpan-RT. |
304 | |
305 | =head1 AUTHOR |
306 | |
307 | Anders Nor Berle E<lt>debolaz@gmail.comE<gt> |
308 | |
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309 | B<with contributions from:> |
310 | |
311 | Robert (phaylon) Sedlacek |
312 | |
313 | Stevan Little |
314 | |
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315 | =head1 COPYRIGHT AND LICENSE |
316 | |
2840a3b2 |
317 | Copyright 2007-2009 by Infinity Interactive, Inc. |
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318 | |
319 | L<http://www.iinteractive.com> |
320 | |
321 | This library is free software; you can redistribute it and/or modify |
322 | it under the same terms as Perl itself. |
323 | |
324 | =cut |
325 | |