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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 Data::OptList; |
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7 | use Sub::Exporter; |
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8 | use Scalar::Util 'blessed'; |
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9 | use Class::MOP 0.60; |
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10 | |
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11 | our $VERSION = '0.82'; |
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12 | $VERSION = eval $VERSION; |
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13 | our $AUTHORITY = 'cpan:STEVAN'; |
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14 | |
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15 | my @exports = qw[ |
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16 | find_meta |
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17 | does_role |
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18 | search_class_by_role |
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19 | ensure_all_roles |
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20 | apply_all_roles |
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21 | get_all_init_args |
22 | get_all_attribute_values |
a5e883ae |
23 | resolve_metatrait_alias |
24 | resolve_metaclass_alias |
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25 | add_method_modifier |
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26 | english_list |
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27 | ]; |
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28 | |
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29 | Sub::Exporter::setup_exporter({ |
30 | exports => \@exports, |
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31 | groups => { all => \@exports } |
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32 | }); |
33 | |
34 | ## some utils for the utils ... |
35 | |
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36 | sub find_meta { Class::MOP::class_of(@_) } |
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37 | |
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38 | ## the functions ... |
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39 | |
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40 | sub does_role { |
41 | my ($class_or_obj, $role) = @_; |
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42 | |
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43 | my $meta = find_meta($class_or_obj); |
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44 | |
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45 | return unless defined $meta; |
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46 | return unless $meta->can('does_role'); |
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47 | return 1 if $meta->does_role($role); |
48 | return; |
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49 | } |
50 | |
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51 | sub search_class_by_role { |
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52 | my ($class_or_obj, $role_name) = @_; |
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53 | |
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54 | my $meta = find_meta($class_or_obj); |
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55 | |
56 | return unless defined $meta; |
57 | |
58 | foreach my $class ($meta->class_precedence_list) { |
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59 | |
60 | my $_meta = find_meta($class); |
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61 | |
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62 | next unless defined $_meta; |
63 | |
64 | foreach my $role (@{ $_meta->roles || [] }) { |
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65 | return $class if $role->name eq $role_name; |
66 | } |
67 | } |
68 | |
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69 | return; |
1631b53f |
70 | } |
71 | |
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72 | # this can possibly behave in unexpected ways because the roles being composed |
73 | # before being applied could differ from call to call; I'm not sure if or how |
74 | # to document this possible quirk. |
75 | sub ensure_all_roles { |
76 | my $applicant = shift; |
77 | _apply_all_roles($applicant, sub { !does_role($applicant, $_) }, @_); |
78 | } |
79 | |
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80 | sub apply_all_roles { |
81 | my $applicant = shift; |
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82 | _apply_all_roles($applicant, sub { 1 }, @_); |
83 | } |
84 | |
85 | sub _apply_all_roles { |
86 | my $applicant = shift; |
87 | my $role_filter = shift; |
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88 | |
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89 | unless (@_) { |
90 | require Moose; |
91 | Moose->throw_error("Must specify at least one role to apply to $applicant"); |
92 | } |
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93 | |
94 | my $roles = Data::OptList::mkopt( [@_] ); |
95 | |
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96 | foreach my $role (@$roles) { |
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97 | Class::MOP::load_class( $role->[0] ); |
98 | my $meta = Class::MOP::class_of( $role->[0] ); |
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99 | |
c8d9f1e2 |
100 | unless ($meta && $meta->isa('Moose::Meta::Role') ) { |
70ea9161 |
101 | require Moose; |
102 | Moose->throw_error( "You can only consume roles, " |
103 | . $role->[0] |
104 | . " is not a Moose role" ); |
105 | } |
106 | } |
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107 | |
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108 | @$roles = grep { local $_ = $_->[0]; $role_filter->() } @$roles; |
109 | |
110 | return unless @$roles; |
111 | |
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112 | my $meta = ( blessed $applicant ? $applicant : find_meta($applicant) ); |
113 | |
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114 | if ( scalar @$roles == 1 ) { |
115 | my ( $role, $params ) = @{ $roles->[0] }; |
7d27ee95 |
116 | my $role_meta = Class::MOP::class_of($role); |
117 | $role_meta->apply( $meta, ( defined $params ? %$params : () ) ); |
d7d8a8c7 |
118 | } |
119 | else { |
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120 | Moose::Meta::Role->combine( @$roles )->apply($meta); |
121 | } |
d7d8a8c7 |
122 | } |
123 | |
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124 | # instance deconstruction ... |
125 | |
126 | sub get_all_attribute_values { |
127 | my ($class, $instance) = @_; |
128 | return +{ |
129 | map { $_->name => $_->get_value($instance) } |
130 | grep { $_->has_value($instance) } |
b2df9268 |
131 | $class->get_all_attributes |
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132 | }; |
133 | } |
134 | |
135 | sub get_all_init_args { |
136 | my ($class, $instance) = @_; |
137 | return +{ |
138 | map { $_->init_arg => $_->get_value($instance) } |
139 | grep { $_->has_value($instance) } |
d03bd989 |
140 | grep { defined($_->init_arg) } |
b2df9268 |
141 | $class->get_all_attributes |
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142 | }; |
143 | } |
144 | |
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145 | sub resolve_metatrait_alias { |
50fbbf3d |
146 | return resolve_metaclass_alias( @_, trait => 1 ); |
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147 | } |
148 | |
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149 | { |
150 | my %cache; |
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151 | |
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152 | sub resolve_metaclass_alias { |
153 | my ( $type, $metaclass_name, %options ) = @_; |
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154 | |
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155 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); |
156 | return $cache{$cache_key}{$metaclass_name} |
157 | if $cache{$cache_key}{$metaclass_name}; |
158 | |
159 | my $possible_full_name |
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160 | = 'Moose::Meta::' |
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161 | . $type |
162 | . '::Custom::' |
163 | . ( $options{trait} ? "Trait::" : "" ) |
164 | . $metaclass_name; |
165 | |
166 | my $loaded_class = Class::MOP::load_first_existing_class( |
167 | $possible_full_name, |
168 | $metaclass_name |
169 | ); |
170 | |
171 | return $cache{$cache_key}{$metaclass_name} |
172 | = $loaded_class->can('register_implementation') |
173 | ? $loaded_class->register_implementation |
174 | : $loaded_class; |
175 | } |
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176 | } |
177 | |
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178 | sub add_method_modifier { |
179 | my ( $class_or_obj, $modifier_name, $args ) = @_; |
180 | my $meta = find_meta($class_or_obj); |
181 | my $code = pop @{$args}; |
182 | my $add_modifier_method = 'add_' . $modifier_name . '_method_modifier'; |
183 | if ( my $method_modifier_type = ref( @{$args}[0] ) ) { |
184 | if ( $method_modifier_type eq 'Regexp' ) { |
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185 | my @all_methods = $meta->get_all_methods; |
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186 | my @matched_methods |
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187 | = grep { $_->name =~ @{$args}[0] } @all_methods; |
188 | $meta->$add_modifier_method( $_->name, $code ) |
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189 | for @matched_methods; |
190 | } |
191 | } |
192 | else { |
193 | $meta->$add_modifier_method( $_, $code ) for @{$args}; |
194 | } |
195 | } |
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196 | |
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197 | sub english_list { |
198 | my @items = sort @_; |
199 | |
200 | return $items[0] if @items == 1; |
201 | return "$items[0] and $items[1]" if @items == 2; |
202 | |
203 | my $tail = pop @items; |
204 | my $list = join ', ', @items; |
205 | $list .= ', and ' . $tail; |
206 | |
207 | return $list; |
208 | } |
209 | |
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210 | 1; |
211 | |
212 | __END__ |
213 | |
214 | =pod |
215 | |
216 | =head1 NAME |
217 | |
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218 | Moose::Util - Utilities for working with Moose classes |
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219 | |
220 | =head1 SYNOPSIS |
221 | |
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222 | use Moose::Util qw/find_meta does_role search_class_by_role/; |
223 | |
224 | my $meta = find_meta($object) || die "No metaclass found"; |
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225 | |
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226 | if (does_role($object, $role)) { |
227 | print "The object can do $role!\n"; |
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228 | } |
229 | |
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230 | my $class = search_class_by_role($object, 'FooRole'); |
231 | print "Nearest class with 'FooRole' is $class\n"; |
232 | |
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233 | =head1 DESCRIPTION |
234 | |
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235 | This module provides a set of utility functions. Many of these |
236 | functions are intended for use in Moose itself or MooseX modules, but |
237 | some of them may be useful for use in your own code. |
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238 | |
239 | =head1 EXPORTED FUNCTIONS |
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240 | |
241 | =over 4 |
242 | |
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243 | =item B<find_meta($class_or_obj)> |
244 | |
245 | This method takes a class name or object and attempts to find a |
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246 | metaclass for the class, if one exists. It will B<not> create one if it |
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247 | does not yet exist. |
248 | |
249 | =item B<does_role($class_or_obj, $role_name)> |
250 | |
251 | Returns true if C<$class_or_obj> does the given C<$role_name>. |
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252 | |
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253 | The class must already have a metaclass for this to work. |
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254 | |
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255 | =item B<search_class_by_role($class_or_obj, $role_name)> |
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256 | |
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257 | Returns the first class in the class's precedence list that does |
258 | C<$role_name>, if any. |
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259 | |
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260 | The class must already have a metaclass for this to work. |
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261 | |
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262 | =item B<apply_all_roles($applicant, @roles)> |
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263 | |
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264 | This function applies one or more roles to the given C<$applicant> The |
265 | applicant can be a role name, class name, or object. |
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266 | |
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267 | The C<$applicant> must already have a metaclass object. |
268 | |
269 | The list of C<@roles> should be a list of names, each of which can be |
270 | followed by an optional hash reference of options (C<exclude> and |
271 | C<alias>). |
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272 | |
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273 | =item B<ensure_all_roles($applicant, @roles)> |
274 | |
275 | This function is similar to L</apply_all_roles>, but only applies roles that |
276 | C<$applicant> does not already consume. |
277 | |
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278 | =item B<get_all_attribute_values($meta, $instance)> |
279 | |
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280 | Returns a hash reference containing all of the C<$instance>'s |
281 | attributes. The keys are attribute names. |
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282 | |
283 | =item B<get_all_init_args($meta, $instance)> |
284 | |
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285 | Returns a hash reference containing all of the C<init_arg> values for |
286 | the instance's attributes. The values are the associated attribute |
287 | values. If an attribute does not have a defined C<init_arg>, it is |
288 | skipped. |
289 | |
290 | This could be useful in cloning an object. |
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291 | |
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292 | =item B<resolve_metaclass_alias($category, $name, %options)> |
293 | |
294 | =item B<resolve_metatrait_alias($category, $name, %options)> |
295 | |
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296 | Resolves a short name to a full class name. Short names are often used |
297 | when specifying the C<metaclass> or C<traits> option for an attribute: |
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298 | |
299 | has foo => ( |
300 | metaclass => "Bar", |
301 | ); |
302 | |
2c3bf4e7 |
303 | The name resolution mechanism is covered in L<Moose/Trait Name |
304 | Resolution>. |
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305 | |
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306 | =item B<english_list(@items)> |
307 | |
308 | Given a list of scalars, turns them into a proper list in English |
309 | ("one and two", "one, two, three, and four"). This is used to help us |
310 | make nicer error messages. |
311 | |
7125b244 |
312 | =back |
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313 | |
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314 | =head1 TODO |
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315 | |
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316 | Here is a list of possible functions to write |
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317 | |
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318 | =over 4 |
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319 | |
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320 | =item discovering original method from modified method |
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321 | |
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322 | =item search for origin class of a method or attribute |
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323 | |
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324 | =back |
325 | |
326 | =head1 BUGS |
327 | |
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328 | All complex software has bugs lurking in it, and this module is no |
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329 | exception. If you find a bug please either email me, or add the bug |
330 | to cpan-RT. |
331 | |
332 | =head1 AUTHOR |
333 | |
334 | Anders Nor Berle E<lt>debolaz@gmail.comE<gt> |
335 | |
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336 | B<with contributions from:> |
337 | |
338 | Robert (phaylon) Sedlacek |
339 | |
340 | Stevan Little |
341 | |
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342 | =head1 COPYRIGHT AND LICENSE |
343 | |
2840a3b2 |
344 | Copyright 2007-2009 by Infinity Interactive, Inc. |
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345 | |
346 | L<http://www.iinteractive.com> |
347 | |
348 | This library is free software; you can redistribute it and/or modify |
b60c9fa0 |
349 | it under the same terms as Perl itself. |
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350 | |
351 | =cut |
352 | |