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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 = '0.73'; |
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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 $_[0]; |
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36 | return Class::MOP::get_metaclass_by_name(blessed($_[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 | |
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83 | foreach my $role (@$roles) { |
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84 | my $meta = Class::MOP::load_class( $role->[0] ); |
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85 | |
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86 | unless ($meta->isa('Moose::Meta::Role') ) { |
70ea9161 |
87 | require Moose; |
88 | Moose->throw_error( "You can only consume roles, " |
89 | . $role->[0] |
90 | . " is not a Moose role" ); |
91 | } |
92 | } |
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93 | |
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94 | my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) ); |
95 | |
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96 | if ( scalar @$roles == 1 ) { |
97 | my ( $role, $params ) = @{ $roles->[0] }; |
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98 | my $role_meta = Class::MOP::class_of($role); |
99 | $role_meta->apply( $meta, ( defined $params ? %$params : () ) ); |
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100 | } |
101 | else { |
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102 | Moose::Meta::Role->combine( @$roles )->apply($meta); |
103 | } |
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104 | } |
105 | |
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106 | # instance deconstruction ... |
107 | |
108 | sub get_all_attribute_values { |
109 | my ($class, $instance) = @_; |
110 | return +{ |
111 | map { $_->name => $_->get_value($instance) } |
112 | grep { $_->has_value($instance) } |
113 | $class->compute_all_applicable_attributes |
114 | }; |
115 | } |
116 | |
117 | sub get_all_init_args { |
118 | my ($class, $instance) = @_; |
119 | return +{ |
120 | map { $_->init_arg => $_->get_value($instance) } |
121 | grep { $_->has_value($instance) } |
122 | grep { defined($_->init_arg) } |
123 | $class->compute_all_applicable_attributes |
124 | }; |
125 | } |
126 | |
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127 | sub resolve_metatrait_alias { |
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128 | return resolve_metaclass_alias( @_, trait => 1 ); |
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129 | } |
130 | |
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131 | { |
132 | my %cache; |
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133 | |
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134 | sub resolve_metaclass_alias { |
135 | my ( $type, $metaclass_name, %options ) = @_; |
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136 | |
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137 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); |
138 | return $cache{$cache_key}{$metaclass_name} |
139 | if $cache{$cache_key}{$metaclass_name}; |
140 | |
141 | my $possible_full_name |
142 | = 'Moose::Meta::' |
143 | . $type |
144 | . '::Custom::' |
145 | . ( $options{trait} ? "Trait::" : "" ) |
146 | . $metaclass_name; |
147 | |
148 | my $loaded_class = Class::MOP::load_first_existing_class( |
149 | $possible_full_name, |
150 | $metaclass_name |
151 | ); |
152 | |
153 | return $cache{$cache_key}{$metaclass_name} |
154 | = $loaded_class->can('register_implementation') |
155 | ? $loaded_class->register_implementation |
156 | : $loaded_class; |
157 | } |
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158 | } |
159 | |
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160 | sub add_method_modifier { |
161 | my ( $class_or_obj, $modifier_name, $args ) = @_; |
162 | my $meta = find_meta($class_or_obj); |
163 | my $code = pop @{$args}; |
164 | my $add_modifier_method = 'add_' . $modifier_name . '_method_modifier'; |
165 | if ( my $method_modifier_type = ref( @{$args}[0] ) ) { |
166 | if ( $method_modifier_type eq 'Regexp' ) { |
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167 | my @all_methods = $meta->get_all_methods; |
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168 | my @matched_methods |
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169 | = grep { $_->name =~ @{$args}[0] } @all_methods; |
170 | $meta->$add_modifier_method( $_->name, $code ) |
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171 | for @matched_methods; |
172 | } |
173 | } |
174 | else { |
175 | $meta->$add_modifier_method( $_, $code ) for @{$args}; |
176 | } |
177 | } |
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178 | |
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179 | sub english_list { |
180 | my @items = sort @_; |
181 | |
182 | return $items[0] if @items == 1; |
183 | return "$items[0] and $items[1]" if @items == 2; |
184 | |
185 | my $tail = pop @items; |
186 | my $list = join ', ', @items; |
187 | $list .= ', and ' . $tail; |
188 | |
189 | return $list; |
190 | } |
191 | |
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192 | 1; |
193 | |
194 | __END__ |
195 | |
196 | =pod |
197 | |
198 | =head1 NAME |
199 | |
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200 | Moose::Util - Utilities for working with Moose classes |
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201 | |
202 | =head1 SYNOPSIS |
203 | |
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204 | use Moose::Util qw/find_meta does_role search_class_by_role/; |
205 | |
206 | my $meta = find_meta($object) || die "No metaclass found"; |
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207 | |
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208 | if (does_role($object, $role)) { |
209 | print "The object can do $role!\n"; |
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210 | } |
211 | |
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212 | my $class = search_class_by_role($object, 'FooRole'); |
213 | print "Nearest class with 'FooRole' is $class\n"; |
214 | |
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215 | =head1 DESCRIPTION |
216 | |
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217 | This module provides a set of utility functions. Many of these |
218 | functions are intended for use in Moose itself or MooseX modules, but |
219 | some of them may be useful for use in your own code. |
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220 | |
221 | =head1 EXPORTED FUNCTIONS |
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222 | |
223 | =over 4 |
224 | |
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225 | =item B<find_meta($class_or_obj)> |
226 | |
227 | This method takes a class name or object and attempts to find a |
228 | metaclass for the class, if one exists. It will not create one if it |
229 | does not yet exist. |
230 | |
231 | =item B<does_role($class_or_obj, $role_name)> |
232 | |
233 | Returns true if C<$class_or_obj> does the given C<$role_name>. |
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234 | |
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235 | The class must already have a metaclass for this to work. |
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236 | |
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237 | =item B<search_class_by_role($class_or_obj, $role_name)> |
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238 | |
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239 | Returns the first class in the class's precedence list that does |
240 | C<$role_name>, if any. |
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241 | |
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242 | The class must already have a metaclass for this to work. |
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243 | |
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244 | =item B<apply_all_roles($applicant, @roles)> |
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245 | |
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246 | This function applies one or more roles to the given C<$applicant> The |
247 | applicant can be a role name, class name, or object. |
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248 | |
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249 | The C<$applicant> must already have a metaclass object. |
250 | |
251 | The list of C<@roles> should be a list of names, each of which can be |
252 | followed by an optional hash reference of options (C<exclude> and |
253 | C<alias>). |
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254 | |
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255 | =item B<get_all_attribute_values($meta, $instance)> |
256 | |
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257 | Returns a hash reference containing all of the C<$instance>'s |
258 | attributes. The keys are attribute names. |
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259 | |
260 | =item B<get_all_init_args($meta, $instance)> |
261 | |
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262 | Returns a hash reference containing all of the C<init_arg> values for |
263 | the instance's attributes. The values are the associated attribute |
264 | values. If an attribute does not have a defined C<init_arg>, it is |
265 | skipped. |
266 | |
267 | This could be useful in cloning an object. |
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268 | |
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269 | =item B<resolve_metaclass_alias($category, $name, %options)> |
270 | |
271 | =item B<resolve_metatrait_alias($category, $name, %options)> |
272 | |
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273 | Resolves a short name to a full class name. Short names are often used |
274 | when specifying the C<metaclass> or C<traits> option for an attribute: |
a3738e5b |
275 | |
276 | has foo => ( |
277 | metaclass => "Bar", |
278 | ); |
279 | |
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280 | The name resolution mechanism is covered in L<Moose/Trait Name |
281 | Resolution>. |
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282 | |
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283 | =item B<english_list(@items)> |
284 | |
285 | Given a list of scalars, turns them into a proper list in English |
286 | ("one and two", "one, two, three, and four"). This is used to help us |
287 | make nicer error messages. |
288 | |
7125b244 |
289 | =back |
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290 | |
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291 | =head1 TODO |
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292 | |
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293 | Here is a list of possible functions to write |
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294 | |
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295 | =over 4 |
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296 | |
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297 | =item discovering original method from modified method |
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298 | |
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299 | =item search for origin class of a method or attribute |
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300 | |
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301 | =back |
302 | |
303 | =head1 BUGS |
304 | |
305 | All complex software has bugs lurking in it, and this module is no |
306 | exception. If you find a bug please either email me, or add the bug |
307 | to cpan-RT. |
308 | |
309 | =head1 AUTHOR |
310 | |
311 | Anders Nor Berle E<lt>debolaz@gmail.comE<gt> |
312 | |
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313 | B<with contributions from:> |
314 | |
315 | Robert (phaylon) Sedlacek |
316 | |
317 | Stevan Little |
318 | |
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319 | =head1 COPYRIGHT AND LICENSE |
320 | |
2840a3b2 |
321 | Copyright 2007-2009 by Infinity Interactive, Inc. |
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322 | |
323 | L<http://www.iinteractive.com> |
324 | |
325 | This library is free software; you can redistribute it and/or modify |
b60c9fa0 |
326 | it under the same terms as Perl itself. |
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327 | |
328 | =cut |
329 | |