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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 | |
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6 | use Carp qw(confess); |
7 | use B (); |
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8 | |
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9 | our @EXPORT_OK = qw( |
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10 | find_meta |
11 | does_role |
12 | resolve_metaclass_alias |
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13 | english_list |
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14 | |
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15 | load_class |
16 | is_class_loaded |
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17 | |
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18 | apply_all_roles |
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19 | not_supported |
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20 | |
21 | get_linear_isa |
22 | get_code_info |
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23 | ); |
24 | our %EXPORT_TAGS = ( |
25 | all => \@EXPORT_OK, |
26 | ); |
27 | |
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28 | # Moose::Util compatible utilities |
29 | |
30 | sub find_meta{ |
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31 | return Mouse::Meta::Module::class_of( $_[0] ); |
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32 | } |
33 | |
34 | sub does_role{ |
35 | my ($class_or_obj, $role) = @_;\r |
36 | \r |
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37 | my $meta = Mouse::Meta::Module::class_of($class_or_obj);\r |
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38 | \r |
39 | return 0 unless defined $meta;\r |
40 | return 1 if $meta->does_role($role);\r |
41 | return 0; |
42 | } |
43 | |
44 | |
45 | |
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46 | BEGIN { |
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47 | my $impl; |
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48 | if ($] >= 5.009_005) { |
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49 | require mro; |
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50 | $impl = \&mro::get_linear_isa; |
51 | } else { |
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52 | my $e = do { |
53 | local $@; |
54 | eval { require MRO::Compat }; |
55 | $@; |
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56 | }; |
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57 | if (!$e) { |
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58 | $impl = \&mro::get_linear_isa; |
59 | } else { |
60 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
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61 | my $_get_linear_isa_dfs; # this recurses so it isn't pretty |
62 | $_get_linear_isa_dfs = sub { |
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63 | no strict 'refs'; |
64 | |
65 | my $classname = shift; |
66 | |
67 | my @lin = ($classname); |
68 | my %stored; |
69 | foreach my $parent (@{"$classname\::ISA"}) { |
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70 | my $plin = $_get_linear_isa_dfs->($parent); |
71 | foreach my $p(@$plin) { |
72 | next if exists $stored{$p}; |
73 | push(@lin, $p); |
74 | $stored{$p} = 1; |
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75 | } |
76 | } |
77 | return \@lin; |
78 | }; |
79 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
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80 | $impl = $_get_linear_isa_dfs; |
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81 | } |
82 | } |
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83 | |
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84 | |
85 | no warnings 'once'; |
86 | *get_linear_isa = $impl; |
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87 | } |
88 | |
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89 | { # taken from Sub::Identify |
90 | sub get_code_info($) {\r |
91 | my ($coderef) = @_;\r |
92 | ref($coderef) or return;\r |
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93 | |
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94 | my $cv = B::svref_2object($coderef);\r |
95 | $cv->isa('B::CV') or return; |
96 | |
97 | my $gv = $cv->GV;\r |
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98 | $gv->isa('B::GV') or return;\r |
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99 | \r |
100 | return ($gv->STASH->NAME, $gv->NAME);\r |
101 | }\r |
102 | } |
103 | |
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104 | # taken from Mouse::Util (0.90) |
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105 | { |
106 | my %cache; |
107 | |
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108 | sub resolve_metaclass_alias {\r |
109 | my ( $type, $metaclass_name, %options ) = @_;\r |
110 | \r |
111 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );\r |
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112 | |
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113 | return $cache{$cache_key}{$metaclass_name} ||= do{\r |
114 | \r |
115 | my $possible_full_name = join '::', |
116 | 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name |
117 | ; |
118 | |
119 | my $loaded_class = load_first_existing_class(\r |
120 | $possible_full_name,\r |
121 | $metaclass_name\r |
122 | );\r |
123 | \r |
124 | $loaded_class->can('register_implementation')\r |
125 | ? $loaded_class->register_implementation\r |
126 | : $loaded_class; |
127 | };\r |
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128 | } |
129 | } |
130 | |
131 | # taken from Class/MOP.pm |
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132 | sub is_valid_class_name { |
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133 | my $class = shift; |
134 | |
135 | return 0 if ref($class); |
136 | return 0 unless defined($class); |
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137 | |
138 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
139 | |
140 | return 0; |
141 | } |
142 | |
143 | # taken from Class/MOP.pm |
144 | sub load_first_existing_class { |
145 | my @classes = @_ |
146 | or return; |
147 | |
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148 | my $found; |
149 | my %exceptions; |
150 | for my $class (@classes) { |
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151 | my $e = _try_load_one_class($class); |
152 | |
153 | if ($e) { |
154 | $exceptions{$class} = $e; |
155 | } |
156 | else { |
157 | $found = $class; |
158 | last; |
159 | } |
160 | } |
161 | return $found if $found; |
162 | |
163 | confess join( |
164 | "\n", |
165 | map { |
166 | sprintf( "Could not load class (%s) because : %s", |
167 | $_, $exceptions{$_} ) |
168 | } @classes |
169 | ); |
170 | } |
171 | |
172 | # taken from Class/MOP.pm |
173 | sub _try_load_one_class { |
174 | my $class = shift; |
175 | |
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176 | unless ( is_valid_class_name($class) ) { |
177 | my $display = defined($class) ? $class : 'undef'; |
178 | confess "Invalid class name ($display)"; |
179 | } |
180 | |
181 | return if is_class_loaded($class); |
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182 | |
183 | my $file = $class . '.pm'; |
184 | $file =~ s{::}{/}g; |
185 | |
186 | return do { |
187 | local $@; |
188 | eval { require($file) }; |
189 | $@; |
190 | }; |
191 | } |
192 | |
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193 | |
194 | sub load_class { |
195 | my $class = shift; |
196 | my $e = _try_load_one_class($class); |
197 | confess "Could not load class ($class) because : $e" if $e; |
198 | |
199 | return 1; |
200 | } |
201 | |
202 | my %is_class_loaded_cache; |
203 | sub is_class_loaded { |
204 | my $class = shift; |
205 | |
206 | return 0 if ref($class) || !defined($class) || !length($class); |
207 | |
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208 | return 1 if $is_class_loaded_cache{$class}; |
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209 | |
210 | # walk the symbol table tree to avoid autovififying |
211 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
212 | |
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213 | my $pack = \%::; |
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214 | foreach my $part (split('::', $class)) { |
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215 | my $entry = \$pack->{$part . '::'}; |
216 | return 0 if ref($entry) ne 'GLOB'; |
217 | $pack = *{$entry}{HASH} or return 0; |
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218 | } |
219 | |
220 | # check for $VERSION or @ISA |
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221 | return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION} |
222 | && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; |
223 | return ++$is_class_loaded_cache{$class} if exists $pack->{ISA} |
224 | && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; |
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225 | |
226 | # check for any method |
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227 | foreach my $name( keys %{$pack} ) { |
228 | my $entry = \$pack->{$name}; |
229 | return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; |
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230 | } |
231 | |
232 | # fail |
233 | return 0; |
234 | } |
235 | |
236 | |
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237 | sub apply_all_roles { |
238 | my $meta = Mouse::Meta::Class->initialize(shift); |
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239 | |
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240 | my @roles; |
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241 | |
242 | # Basis of Data::OptList |
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243 | my $max = scalar(@_); |
244 | for (my $i = 0; $i < $max ; $i++) { |
245 | if ($i + 1 < $max && ref($_[$i + 1])) { |
246 | push @roles, [ $_[$i++] => $_[$i] ]; |
247 | } else { |
248 | push @roles, [ $_[$i] => {} ]; |
249 | } |
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250 | my $role_name = $roles[-1][0]; |
251 | load_class($role_name); |
252 | ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') ) |
253 | || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); |
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254 | } |
255 | |
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256 | if ( scalar @roles == 1 ) { |
257 | my ( $role, $params ) = @{ $roles[0] }; |
258 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
259 | } |
260 | else { |
261 | Mouse::Meta::Role->combine_apply($meta, @roles); |
262 | } |
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263 | return; |
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264 | } |
265 | |
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266 | # taken from Moose::Util 0.90 |
267 | sub english_list { |
268 | return $_[0] if @_ == 1;\r |
269 | |
270 | my @items = sort @_;\r |
271 | \r |
272 | return "$items[0] and $items[1]" if @items == 2;\r |
273 | \r |
274 | my $tail = pop @items;\r |
275 | \r |
276 | return join q{, }, @items, "and $tail";\r |
277 | } |
278 | |
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279 | sub not_supported{ |
280 | my($feature) = @_; |
281 | |
282 | $feature ||= ( caller(1) )[3]; # subroutine name |
283 | |
284 | local $Carp::CarpLevel = $Carp::CarpLevel + 2; |
285 | Carp::croak("Mouse does not currently support $feature"); |
286 | } |
287 | |
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288 | 1; |
289 | |
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290 | __END__ |
291 | |
292 | =head1 NAME |
293 | |
294 | Mouse::Util - features, with or without their dependencies |
295 | |
296 | =head1 IMPLEMENTATIONS FOR |
297 | |
298 | =head2 L<MRO::Compat> |
299 | |
300 | =head3 get_linear_isa |
301 | |
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302 | =cut |
303 | |