Commit | Line | Data |
4093c859 |
1 | package Mouse::Util; |
2 | use strict; |
3 | use warnings; |
5c12655d |
4 | use base qw/Exporter/; |
3a63a2e7 |
5 | use Carp qw(confess); |
6 | use B (); |
4093c859 |
7 | |
eae80759 |
8 | our @EXPORT_OK = qw( |
6cfa1e5e |
9 | load_class |
10 | is_class_loaded |
eae80759 |
11 | get_linear_isa |
e2578812 |
12 | apply_all_roles |
3a63a2e7 |
13 | get_code_info |
fce211ae |
14 | not_supported |
eae80759 |
15 | ); |
16 | our %EXPORT_TAGS = ( |
17 | all => \@EXPORT_OK, |
18 | ); |
19 | |
42d7df00 |
20 | BEGIN { |
272a1930 |
21 | my $impl; |
bcd39bf4 |
22 | if ($] >= 5.009_005) { |
388b8ebd |
23 | require mro; |
272a1930 |
24 | $impl = \&mro::get_linear_isa; |
25 | } else { |
e0396a57 |
26 | my $e = do { |
27 | local $@; |
28 | eval { require MRO::Compat }; |
29 | $@; |
f172d4e7 |
30 | }; |
e0396a57 |
31 | if (!$e) { |
272a1930 |
32 | $impl = \&mro::get_linear_isa; |
33 | } else { |
34 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
e0396a57 |
35 | my $_get_linear_isa_dfs; # this recurses so it isn't pretty |
36 | $_get_linear_isa_dfs = sub { |
272a1930 |
37 | no strict 'refs'; |
38 | |
39 | my $classname = shift; |
40 | |
41 | my @lin = ($classname); |
42 | my %stored; |
43 | foreach my $parent (@{"$classname\::ISA"}) { |
e0396a57 |
44 | my $plin = $_get_linear_isa_dfs->($parent); |
45 | foreach my $p(@$plin) { |
46 | next if exists $stored{$p}; |
47 | push(@lin, $p); |
48 | $stored{$p} = 1; |
272a1930 |
49 | } |
50 | } |
51 | return \@lin; |
52 | }; |
53 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
e0396a57 |
54 | $impl = $_get_linear_isa_dfs; |
eae80759 |
55 | } |
56 | } |
bcd39bf4 |
57 | |
a81cc7b8 |
58 | |
59 | no warnings 'once'; |
60 | *get_linear_isa = $impl; |
eae80759 |
61 | } |
62 | |
3a63a2e7 |
63 | { # taken from Sub::Identify |
64 | sub get_code_info($) {\r |
65 | my ($coderef) = @_;\r |
66 | ref($coderef) or return;\r |
23264b5b |
67 | |
3a63a2e7 |
68 | my $cv = B::svref_2object($coderef);\r |
69 | $cv->isa('B::CV') or return; |
70 | |
71 | my $gv = $cv->GV;\r |
23264b5b |
72 | $gv->isa('B::GV') or return;\r |
3a63a2e7 |
73 | \r |
74 | return ($gv->STASH->NAME, $gv->NAME);\r |
75 | }\r |
76 | } |
77 | |
abfdffe0 |
78 | # taken from Class/MOP.pm |
79 | { |
80 | my %cache; |
81 | |
82 | sub resolve_metaclass_alias { |
83 | my ( $type, $metaclass_name, %options ) = @_; |
84 | |
85 | my $cache_key = $type; |
86 | return $cache{$cache_key}{$metaclass_name} |
87 | if $cache{$cache_key}{$metaclass_name}; |
88 | |
89 | my $possible_full_name = |
90 | 'Mouse::Meta::' |
91 | . $type |
92 | . '::Custom::' |
93 | . $metaclass_name; |
94 | |
95 | my $loaded_class = |
96 | load_first_existing_class( $possible_full_name, |
97 | $metaclass_name ); |
98 | |
99 | return $cache{$cache_key}{$metaclass_name} = |
100 | $loaded_class->can('register_implementation') |
101 | ? $loaded_class->register_implementation |
102 | : $loaded_class; |
103 | } |
104 | } |
105 | |
106 | # taken from Class/MOP.pm |
a81cc7b8 |
107 | sub is_valid_class_name { |
abfdffe0 |
108 | my $class = shift; |
109 | |
110 | return 0 if ref($class); |
111 | return 0 unless defined($class); |
abfdffe0 |
112 | |
113 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
114 | |
115 | return 0; |
116 | } |
117 | |
118 | # taken from Class/MOP.pm |
119 | sub load_first_existing_class { |
120 | my @classes = @_ |
121 | or return; |
122 | |
23264b5b |
123 | my $found; |
124 | my %exceptions; |
125 | for my $class (@classes) { |
abfdffe0 |
126 | my $e = _try_load_one_class($class); |
127 | |
128 | if ($e) { |
129 | $exceptions{$class} = $e; |
130 | } |
131 | else { |
132 | $found = $class; |
133 | last; |
134 | } |
135 | } |
136 | return $found if $found; |
137 | |
138 | confess join( |
139 | "\n", |
140 | map { |
141 | sprintf( "Could not load class (%s) because : %s", |
142 | $_, $exceptions{$_} ) |
143 | } @classes |
144 | ); |
145 | } |
146 | |
147 | # taken from Class/MOP.pm |
148 | sub _try_load_one_class { |
149 | my $class = shift; |
150 | |
6cfa1e5e |
151 | unless ( is_valid_class_name($class) ) { |
152 | my $display = defined($class) ? $class : 'undef'; |
153 | confess "Invalid class name ($display)"; |
154 | } |
155 | |
156 | return if is_class_loaded($class); |
abfdffe0 |
157 | |
158 | my $file = $class . '.pm'; |
159 | $file =~ s{::}{/}g; |
160 | |
161 | return do { |
162 | local $@; |
163 | eval { require($file) }; |
164 | $@; |
165 | }; |
166 | } |
167 | |
6cfa1e5e |
168 | |
169 | sub load_class { |
170 | my $class = shift; |
171 | my $e = _try_load_one_class($class); |
172 | confess "Could not load class ($class) because : $e" if $e; |
173 | |
174 | return 1; |
175 | } |
176 | |
177 | my %is_class_loaded_cache; |
178 | sub is_class_loaded { |
179 | my $class = shift; |
180 | |
181 | return 0 if ref($class) || !defined($class) || !length($class); |
182 | |
183 | return 1 if exists $is_class_loaded_cache{$class}; |
184 | |
185 | # walk the symbol table tree to avoid autovififying |
186 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
187 | |
188 | my $pack = \*::; |
189 | foreach my $part (split('::', $class)) { |
190 | return 0 unless exists ${$$pack}{"${part}::"}; |
191 | $pack = \*{${$$pack}{"${part}::"}}; |
192 | } |
193 | |
194 | # check for $VERSION or @ISA |
195 | return ++$is_class_loaded_cache{$class} if exists ${$$pack}{VERSION} |
196 | && defined *{${$$pack}{VERSION}}{SCALAR}; |
197 | return ++$is_class_loaded_cache{$class} if exists ${$$pack}{ISA} |
198 | && defined *{${$$pack}{ISA}}{ARRAY}; |
199 | |
200 | # check for any method |
201 | foreach ( keys %{$$pack} ) { |
202 | next if substr($_, -2, 2) eq '::'; |
203 | return ++$is_class_loaded_cache{$class} if defined *{${$$pack}{$_}}{CODE}; |
204 | } |
205 | |
206 | # fail |
207 | return 0; |
208 | } |
209 | |
210 | |
2e92bb89 |
211 | sub apply_all_roles { |
212 | my $meta = Mouse::Meta::Class->initialize(shift); |
2e92bb89 |
213 | |
21498b08 |
214 | my @roles; |
f6715552 |
215 | |
216 | # Basis of Data::OptList |
21498b08 |
217 | my $max = scalar(@_); |
218 | for (my $i = 0; $i < $max ; $i++) { |
219 | if ($i + 1 < $max && ref($_[$i + 1])) { |
220 | push @roles, [ $_[$i++] => $_[$i] ]; |
221 | } else { |
222 | push @roles, [ $_[$i] => {} ]; |
223 | } |
224 | } |
225 | |
226 | foreach my $role_spec (@roles) { |
227 | Mouse::load_class( $role_spec->[0] ); |
228 | } |
229 | |
230 | ( $_->[0]->can('meta') && $_->[0]->meta->isa('Mouse::Meta::Role') ) |
3a63a2e7 |
231 | || confess("You can only consume roles, " |
21498b08 |
232 | . $_->[0] |
233 | . " is not a Moose role") |
234 | foreach @roles; |
235 | |
236 | if ( scalar @roles == 1 ) { |
237 | my ( $role, $params ) = @{ $roles[0] }; |
238 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
239 | } |
240 | else { |
241 | Mouse::Meta::Role->combine_apply($meta, @roles); |
242 | } |
23264b5b |
243 | return; |
2e92bb89 |
244 | } |
245 | |
fce211ae |
246 | sub not_supported{ |
247 | my($feature) = @_; |
248 | |
249 | $feature ||= ( caller(1) )[3]; # subroutine name |
250 | |
251 | local $Carp::CarpLevel = $Carp::CarpLevel + 2; |
252 | Carp::croak("Mouse does not currently support $feature"); |
253 | } |
254 | |
4093c859 |
255 | 1; |
256 | |
f38ce2d0 |
257 | __END__ |
258 | |
259 | =head1 NAME |
260 | |
261 | Mouse::Util - features, with or without their dependencies |
262 | |
263 | =head1 IMPLEMENTATIONS FOR |
264 | |
265 | =head2 L<MRO::Compat> |
266 | |
267 | =head3 get_linear_isa |
268 | |
f38ce2d0 |
269 | =cut |
270 | |