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1 | package Class::C3::Componentised; |
2 | |
20169807 |
3 | =head1 NAME |
4 | |
5 | Class::C3::Componentised |
6 | |
7 | =head1 DESCRIPTION |
8 | |
9 | Load mix-ins or components to your C3-based class. |
10 | |
11 | =head1 SYNOPSIS |
12 | |
13 | package MyModule; |
14 | |
15 | use strict; |
16 | use warnings; |
17 | |
18 | use base 'Class::C3::Componentised'; |
19 | |
0c205e9c |
20 | sub component_base_class { "MyModule::Component" } |
20169807 |
21 | |
22 | package main; |
23 | |
0c205e9c |
24 | MyModule->load_components( qw/Foo Bar/ ); |
b34a4025 |
25 | # Will load MyModule::Component::Foo and MyModule::Component::Bar |
0c205e9c |
26 | |
27 | =head1 DESCRIPTION |
28 | |
29 | This will inject base classes to your module using the L<Class::C3> method |
30 | resolution order. |
31 | |
32 | Please note: these are not plugins that can take precedence over methods |
33 | declared in MyModule. If you want something like that, consider |
34 | L<MooseX::Object::Pluggable>. |
20169807 |
35 | |
36 | =head1 METHODS |
37 | |
38 | =cut |
39 | |
d288ce53 |
40 | use strict; |
41 | use warnings; |
42 | |
3a4635fb |
43 | # This will prime the Class::C3 namespace (either by loading it proper on 5.8 |
44 | # or by installing compat shims on 5.10+). A user might have a reasonable |
45 | # expectation that using Class::C3::<something> will give him access to |
46 | # Class::C3 itself, and this module has been providing this historically. |
47 | # Therefore leaving it in indefinitely. |
0b8e135a |
48 | use MRO::Compat; |
3a4635fb |
49 | |
f8b4872f |
50 | use Carp (); |
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51 | |
011bd3f1 |
52 | our $VERSION = 1.0008; |
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53 | |
eac9b176 |
54 | my $invalid_class = qr/(?: \b:\b | \:{3,} | \:\:$ )/x; |
55 | |
20169807 |
56 | =head2 load_components( @comps ) |
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57 | |
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58 | Loads the given components into the current module. If a module begins with a |
59 | C<+> character, it is taken to be a fully qualified class name, otherwise |
60 | C<< $class->component_base_class >> is prepended to it. |
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61 | |
20169807 |
62 | Calling this will call C<Class::C3::reinitialize>. |
63 | |
64 | =cut |
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65 | |
66 | sub load_components { |
67 | my $class = shift; |
3a4635fb |
68 | $class->_load_components( map { |
69 | /^\+(.*)$/ |
70 | ? $1 |
71 | : join ('::', $class->component_base_class, $_) |
72 | } grep { $_ !~ /^#/ } @_ |
73 | ); |
d288ce53 |
74 | } |
75 | |
20169807 |
76 | =head2 load_own_components( @comps ) |
77 | |
5e54b45d |
78 | Similar to L<load_components>, but assumes every class is C<"$class::$comp">. |
20169807 |
79 | |
80 | =cut |
81 | |
d288ce53 |
82 | sub load_own_components { |
83 | my $class = shift; |
3a4635fb |
84 | $class->_load_components( map { "${class}::$_" } grep { $_ !~ /^#/ } @_ ); |
d288ce53 |
85 | } |
86 | |
87 | sub _load_components { |
3a4635fb |
88 | my $class = shift; |
89 | return unless @_; |
90 | |
91 | $class->ensure_class_loaded($_) for @_; |
92 | $class->inject_base($class => @_); |
20169807 |
93 | Class::C3::reinitialize(); |
d288ce53 |
94 | } |
95 | |
20169807 |
96 | =head2 load_optional_components |
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97 | |
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98 | As L<load_components>, but will silently ignore any components that cannot be |
99 | found. |
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100 | |
20169807 |
101 | =cut |
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102 | |
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103 | sub load_optional_components { |
104 | my $class = shift; |
3a4635fb |
105 | $class->_load_components( grep |
106 | { $class->load_optional_class( $_ ) } |
107 | ( map |
108 | { /^\+(.*)$/ |
109 | ? $1 |
110 | : join ('::', $class->component_base_class, $_) |
111 | } |
112 | grep { $_ !~ /^#/ } @_ |
113 | ) |
114 | ); |
20169807 |
115 | } |
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116 | |
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117 | =head2 ensure_class_loaded |
118 | |
119 | Given a class name, tests to see if it is already loaded or otherwise |
120 | defined. If it is not yet loaded, the package is require'd, and an exception |
121 | is thrown if the class is still not loaded. |
122 | |
123 | BUG: For some reason, packages with syntax errors are added to %INC on |
124 | require |
125 | =cut |
126 | |
20169807 |
127 | sub ensure_class_loaded { |
128 | my ($class, $f_class) = @_; |
129 | |
3a4635fb |
130 | no strict 'refs'; |
131 | |
132 | # ripped from Class::Inspector for speed |
133 | # note that the order is important (faster items are first) |
134 | return if ${"${f_class}::VERSION"}; |
135 | |
136 | return if @{"${f_class}::ISA"}; |
137 | |
138 | my $file = (join ('/', split ('::', $f_class) ) ) . '.pm'; |
139 | return if $INC{$file}; |
140 | |
141 | for ( keys %{"${f_class}::"} ) { |
142 | return if ( *{"${f_class}::$_"}{CODE} ); |
143 | } |
144 | |
3a4635fb |
145 | # require always returns true on success |
15b7d164 |
146 | # ill-behaved modules might very well obliterate $_ |
147 | eval { local $_; require($file) } or do { |
3a4635fb |
148 | |
eac9b176 |
149 | $@ = "Invalid class name '$f_class'" if $f_class =~ $invalid_class; |
3a4635fb |
150 | |
20169807 |
151 | if ($class->can('throw_exception')) { |
152 | $class->throw_exception($@); |
153 | } else { |
f8b4872f |
154 | Carp::croak $@; |
20169807 |
155 | } |
3a4635fb |
156 | }; |
157 | |
158 | return; |
20169807 |
159 | } |
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160 | |
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161 | =head2 ensure_class_found |
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162 | |
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163 | Returns true if the specified class is installed or already loaded, false |
b34a4025 |
164 | otherwise. |
165 | |
166 | Note that the underlying mechanism (Class::Inspector->installed()) used by this |
167 | sub will not, at the time of writing, correctly function when @INC includes |
168 | coderefs. Since PAR relies upon coderefs in @INC, this function should be |
169 | avoided in modules that are likely to be included within a PAR. |
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170 | |
20169807 |
171 | =cut |
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172 | |
20169807 |
173 | sub ensure_class_found { |
3a4635fb |
174 | #my ($class, $f_class) = @_; |
175 | require Class::Inspector; |
176 | return Class::Inspector->loaded($_[1]) || |
177 | Class::Inspector->installed($_[1]); |
20169807 |
178 | } |
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179 | |
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180 | |
181 | =head2 inject_base |
182 | |
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183 | Does the actual magic of adjusting @ISA on the target module. |
184 | |
185 | =cut |
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186 | |
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187 | sub inject_base { |
3a4635fb |
188 | my $class = shift; |
189 | my $target = shift; |
190 | |
3a4635fb |
191 | for (reverse @_) { |
20169807 |
192 | no strict 'refs'; |
e1950a66 |
193 | unshift ( @{"${target}::ISA"}, $_ ) |
194 | unless ($target eq $_ || $target->isa($_)); |
20169807 |
195 | } |
196 | |
d91a39a9 |
197 | mro::set_mro($target, 'c3'); |
20169807 |
198 | } |
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199 | |
078742b1 |
200 | =head2 load_optional_class |
201 | |
202 | Returns a true value if the specified class is installed and loaded |
203 | successfully, throws an exception if the class is found but not loaded |
204 | successfully, and false if the class is not installed |
205 | |
206 | =cut |
207 | |
208 | sub load_optional_class { |
209 | my ($class, $f_class) = @_; |
3a4635fb |
210 | |
211 | # ensure_class_loaded either returns a () (*not* true) or throws |
212 | eval { |
213 | $class->ensure_class_loaded($f_class); |
214 | 1; |
215 | } && return 1; |
216 | |
dfb3a821 |
217 | my $err = $@; # so we don't lose it |
3a4635fb |
218 | |
eac9b176 |
219 | if ($f_class =~ $invalid_class) { |
220 | $err = "Invalid class name '$f_class'"; |
221 | } |
222 | else { |
223 | my $fn = quotemeta( (join ('/', split ('::', $f_class) ) ) . '.pm' ); |
224 | return 0 if ($err =~ /Can't locate ${fn} in \@INC/ ); |
3a4635fb |
225 | } |
eac9b176 |
226 | |
227 | if ($class->can('throw_exception')) { |
3a4635fb |
228 | $class->throw_exception($err); |
078742b1 |
229 | } |
dfb3a821 |
230 | else { |
3a4635fb |
231 | die $err; |
dfb3a821 |
232 | } |
078742b1 |
233 | } |
234 | |
025a7b58 |
235 | =head1 AUTHORS |
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236 | |
025a7b58 |
237 | Matt S. Trout and the L<DBIx::Class team|DBIx::Class/CONTRIBUTORS> |
20169807 |
238 | |
239 | Pulled out into seperate module by Ash Berlin C<< <ash@cpan.org> >> |
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240 | |
025a7b58 |
241 | Optimizations and overall bolt-tightening by Peter "ribasushi" Rabbitson |
242 | C<< <ribasushi@cpan.org> >> |
243 | |
244 | =head1 COPYRIGHT |
245 | |
246 | Copyright (c) 2006 - 2011 the Class::C3::Componentised L</AUTHORS> as listed |
247 | above. |
248 | |
d288ce53 |
249 | =head1 LICENSE |
250 | |
251 | You may distribute this code under the same terms as Perl itself. |
20169807 |
252 | |
253 | =cut |
254 | |
255 | 1; |