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1 | package Mouse::Util; |
2 | use strict; |
3 | use warnings; |
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4 | use base qw/Exporter/; |
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5 | use Carp qw(confess); |
6 | use B (); |
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7 | |
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8 | our @EXPORT_OK = qw( |
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9 | find_meta |
10 | does_role |
11 | resolve_metaclass_alias |
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12 | english_list |
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13 | |
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14 | load_class |
15 | is_class_loaded |
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16 | |
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17 | apply_all_roles |
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18 | not_supported |
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19 | |
20 | get_linear_isa |
21 | get_code_info |
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22 | ); |
23 | our %EXPORT_TAGS = ( |
24 | all => \@EXPORT_OK, |
25 | ); |
26 | |
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27 | # Moose::Util compatible utilities |
28 | |
29 | sub find_meta{ |
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30 | return Mouse::Meta::Module::class_of( $_[0] ); |
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31 | } |
32 | |
33 | sub does_role{ |
34 | my ($class_or_obj, $role) = @_;\r |
35 | \r |
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36 | my $meta = Mouse::Meta::Module::class_of($class_or_obj);\r |
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37 | \r |
38 | return 0 unless defined $meta;\r |
39 | return 1 if $meta->does_role($role);\r |
40 | return 0; |
41 | } |
42 | |
43 | |
44 | |
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45 | BEGIN { |
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46 | my $impl; |
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47 | if ($] >= 5.009_005) { |
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48 | require mro; |
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49 | $impl = \&mro::get_linear_isa; |
50 | } else { |
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51 | my $e = do { |
52 | local $@; |
53 | eval { require MRO::Compat }; |
54 | $@; |
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55 | }; |
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56 | if (!$e) { |
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57 | $impl = \&mro::get_linear_isa; |
58 | } else { |
59 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
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60 | my $_get_linear_isa_dfs; # this recurses so it isn't pretty |
61 | $_get_linear_isa_dfs = sub { |
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62 | no strict 'refs'; |
63 | |
64 | my $classname = shift; |
65 | |
66 | my @lin = ($classname); |
67 | my %stored; |
68 | foreach my $parent (@{"$classname\::ISA"}) { |
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69 | my $plin = $_get_linear_isa_dfs->($parent); |
70 | foreach my $p(@$plin) { |
71 | next if exists $stored{$p}; |
72 | push(@lin, $p); |
73 | $stored{$p} = 1; |
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74 | } |
75 | } |
76 | return \@lin; |
77 | }; |
78 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
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79 | $impl = $_get_linear_isa_dfs; |
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80 | } |
81 | } |
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82 | |
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83 | |
84 | no warnings 'once'; |
85 | *get_linear_isa = $impl; |
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86 | } |
87 | |
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88 | { # taken from Sub::Identify |
89 | sub get_code_info($) {\r |
90 | my ($coderef) = @_;\r |
91 | ref($coderef) or return;\r |
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92 | |
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93 | my $cv = B::svref_2object($coderef);\r |
94 | $cv->isa('B::CV') or return; |
95 | |
96 | my $gv = $cv->GV;\r |
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97 | $gv->isa('B::GV') or return;\r |
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98 | \r |
99 | return ($gv->STASH->NAME, $gv->NAME);\r |
100 | }\r |
101 | } |
102 | |
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103 | # taken from Mouse::Util (0.90) |
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104 | { |
105 | my %cache; |
106 | |
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107 | sub resolve_metaclass_alias {\r |
108 | my ( $type, $metaclass_name, %options ) = @_;\r |
109 | \r |
110 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );\r |
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111 | |
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112 | return $cache{$cache_key}{$metaclass_name} ||= do{\r |
113 | \r |
114 | my $possible_full_name = join '::', |
115 | 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name |
116 | ; |
117 | |
118 | my $loaded_class = load_first_existing_class(\r |
119 | $possible_full_name,\r |
120 | $metaclass_name\r |
121 | );\r |
122 | \r |
123 | $loaded_class->can('register_implementation')\r |
124 | ? $loaded_class->register_implementation\r |
125 | : $loaded_class; |
126 | };\r |
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127 | } |
128 | } |
129 | |
130 | # taken from Class/MOP.pm |
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131 | sub is_valid_class_name { |
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132 | my $class = shift; |
133 | |
134 | return 0 if ref($class); |
135 | return 0 unless defined($class); |
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136 | |
137 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
138 | |
139 | return 0; |
140 | } |
141 | |
142 | # taken from Class/MOP.pm |
143 | sub load_first_existing_class { |
144 | my @classes = @_ |
145 | or return; |
146 | |
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147 | my $found; |
148 | my %exceptions; |
149 | for my $class (@classes) { |
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150 | my $e = _try_load_one_class($class); |
151 | |
152 | if ($e) { |
153 | $exceptions{$class} = $e; |
154 | } |
155 | else { |
156 | $found = $class; |
157 | last; |
158 | } |
159 | } |
160 | return $found if $found; |
161 | |
162 | confess join( |
163 | "\n", |
164 | map { |
165 | sprintf( "Could not load class (%s) because : %s", |
166 | $_, $exceptions{$_} ) |
167 | } @classes |
168 | ); |
169 | } |
170 | |
171 | # taken from Class/MOP.pm |
172 | sub _try_load_one_class { |
173 | my $class = shift; |
174 | |
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175 | unless ( is_valid_class_name($class) ) { |
176 | my $display = defined($class) ? $class : 'undef'; |
177 | confess "Invalid class name ($display)"; |
178 | } |
179 | |
180 | return if is_class_loaded($class); |
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181 | |
182 | my $file = $class . '.pm'; |
183 | $file =~ s{::}{/}g; |
184 | |
185 | return do { |
186 | local $@; |
187 | eval { require($file) }; |
188 | $@; |
189 | }; |
190 | } |
191 | |
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192 | |
193 | sub load_class { |
194 | my $class = shift; |
195 | my $e = _try_load_one_class($class); |
196 | confess "Could not load class ($class) because : $e" if $e; |
197 | |
198 | return 1; |
199 | } |
200 | |
201 | my %is_class_loaded_cache; |
202 | sub is_class_loaded { |
203 | my $class = shift; |
204 | |
205 | return 0 if ref($class) || !defined($class) || !length($class); |
206 | |
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207 | return 1 if $is_class_loaded_cache{$class}; |
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208 | |
209 | # walk the symbol table tree to avoid autovififying |
210 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
211 | |
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212 | my $pack = \%::; |
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213 | foreach my $part (split('::', $class)) { |
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214 | my $entry = \$pack->{$part . '::'}; |
215 | return 0 if ref($entry) ne 'GLOB'; |
216 | $pack = *{$entry}{HASH} or return 0; |
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217 | } |
218 | |
219 | # check for $VERSION or @ISA |
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220 | return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION} |
221 | && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; |
222 | return ++$is_class_loaded_cache{$class} if exists $pack->{ISA} |
223 | && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; |
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224 | |
225 | # check for any method |
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226 | foreach my $name( keys %{$pack} ) { |
227 | my $entry = \$pack->{$name}; |
228 | return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; |
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229 | } |
230 | |
231 | # fail |
232 | return 0; |
233 | } |
234 | |
235 | |
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236 | sub apply_all_roles { |
237 | my $meta = Mouse::Meta::Class->initialize(shift); |
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238 | |
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239 | my @roles; |
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240 | |
241 | # Basis of Data::OptList |
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242 | my $max = scalar(@_); |
243 | for (my $i = 0; $i < $max ; $i++) { |
244 | if ($i + 1 < $max && ref($_[$i + 1])) { |
245 | push @roles, [ $_[$i++] => $_[$i] ]; |
246 | } else { |
247 | push @roles, [ $_[$i] => {} ]; |
248 | } |
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249 | my $role_name = $roles[-1][0]; |
250 | load_class($role_name); |
251 | ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') ) |
252 | || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); |
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253 | } |
254 | |
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255 | if ( scalar @roles == 1 ) { |
256 | my ( $role, $params ) = @{ $roles[0] }; |
257 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
258 | } |
259 | else { |
260 | Mouse::Meta::Role->combine_apply($meta, @roles); |
261 | } |
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262 | return; |
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263 | } |
264 | |
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265 | # taken from Moose::Util 0.90 |
266 | sub english_list { |
267 | return $_[0] if @_ == 1;\r |
268 | |
269 | my @items = sort @_;\r |
270 | \r |
271 | return "$items[0] and $items[1]" if @items == 2;\r |
272 | \r |
273 | my $tail = pop @items;\r |
274 | \r |
275 | return join q{, }, @items, "and $tail";\r |
276 | } |
277 | |
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278 | sub not_supported{ |
279 | my($feature) = @_; |
280 | |
281 | $feature ||= ( caller(1) )[3]; # subroutine name |
282 | |
283 | local $Carp::CarpLevel = $Carp::CarpLevel + 2; |
284 | Carp::croak("Mouse does not currently support $feature"); |
285 | } |
286 | |
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287 | 1; |
288 | |
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289 | __END__ |
290 | |
291 | =head1 NAME |
292 | |
293 | Mouse::Util - features, with or without their dependencies |
294 | |
295 | =head1 IMPLEMENTATIONS FOR |
296 | |
297 | =head2 L<MRO::Compat> |
298 | |
299 | =head3 get_linear_isa |
300 | |
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301 | =cut |
302 | |