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1 | package Moo; |
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2 | |
3 | use strictures 1; |
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4 | use Moo::_Utils; |
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5 | |
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6 | our $VERSION = '0.009001'; # 0.9.1 |
7 | $VERSION = eval $VERSION; |
8 | |
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9 | our %MAKERS; |
10 | |
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11 | sub import { |
12 | my $target = caller; |
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13 | my $class = shift; |
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14 | strictures->import; |
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15 | return if $MAKERS{$target}; # already exported into this package |
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16 | *{_getglob("${target}::extends")} = sub { |
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17 | _load_module($_) for @_; |
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18 | *{_getglob("${target}::ISA")} = \@_; |
19 | }; |
20 | *{_getglob("${target}::with")} = sub { |
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21 | require Moo::Role; |
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22 | die "Only one role supported at a time by with" if @_ > 1; |
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23 | Moo::Role->apply_role_to_package($_[0], $target); |
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24 | }; |
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25 | $MAKERS{$target} = {}; |
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26 | *{_getglob("${target}::has")} = sub { |
27 | my ($name, %spec) = @_; |
28 | ($MAKERS{$target}{accessor} ||= do { |
29 | require Method::Generate::Accessor; |
30 | Method::Generate::Accessor->new |
31 | })->generate_method($target, $name, \%spec); |
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32 | $class->_constructor_maker_for($target) |
33 | ->register_attribute_specs($name, \%spec); |
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34 | }; |
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35 | foreach my $type (qw(before after around)) { |
36 | *{_getglob "${target}::${type}"} = sub { |
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37 | require Class::Method::Modifiers; |
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38 | _install_modifier($target, $type, @_); |
39 | }; |
40 | } |
41 | { |
42 | no strict 'refs'; |
43 | @{"${target}::ISA"} = do { |
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44 | require Moo::Object; ('Moo::Object'); |
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45 | } unless @{"${target}::ISA"}; |
46 | } |
47 | } |
48 | |
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49 | sub _constructor_maker_for { |
50 | my ($class, $target) = @_; |
51 | return unless $MAKERS{$target}; |
52 | $MAKERS{$target}{constructor} ||= do { |
53 | require Method::Generate::Constructor; |
54 | Method::Generate::Constructor |
55 | ->new( |
56 | package => $target, |
57 | accessor_generator => do { |
58 | require Method::Generate::Accessor; |
59 | Method::Generate::Accessor->new; |
60 | } |
61 | ) |
62 | ->install_delayed |
63 | ->register_attribute_specs(do { |
64 | my @spec; |
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65 | # using the -last- entry in @ISA means that classes created by |
66 | # Role::Tiny as N roles + superclass will still get the attributes |
67 | # from the superclass |
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68 | if (my $super = do { no strict 'refs'; ${"${target}::ISA"}[-1] }) { |
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69 | if (my $con = $MAKERS{$super}{constructor}) { |
70 | @spec = %{$con->all_attribute_specs}; |
71 | } |
72 | } |
73 | @spec; |
74 | }); |
75 | } |
76 | } |
77 | |
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78 | 1; |
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79 | |
80 | =pod |
81 | |
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82 | =head1 NAME |
83 | |
84 | Moo - Minimalist Object Orientation (with Moose compatiblity) |
85 | |
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86 | =head1 SYNOPSIS |
87 | |
88 | package Cat::Food; |
89 | |
90 | use Moo; |
91 | use Sub::Quote; |
92 | |
93 | sub feed_lion { |
94 | my $self = shift; |
95 | my $amount = shift || 1; |
96 | |
97 | $self->pounds( $self->pounds - $amount ); |
98 | } |
99 | |
100 | has taste => ( |
101 | is => 'ro', |
102 | ); |
103 | |
104 | has brand => ( |
105 | is => 'ro', |
106 | isa => sub { |
107 | die "Only SWEET-TREATZ supported!" unless $_[0] eq 'SWEET-TREATZ' |
108 | }, |
109 | ); |
110 | |
111 | has pounds => ( |
112 | is => 'rw', |
113 | isa => quote_sub q{ die "$_[0] is too much cat food!" unless $_[0] < 15 }, |
114 | ); |
115 | |
116 | 1; |
117 | |
118 | and else where |
119 | |
120 | my $full = Cat::Food->new( |
121 | taste => 'DELICIOUS.', |
122 | brand => 'SWEET-TREATZ', |
123 | pounds => 10, |
124 | ); |
125 | |
126 | $full->feed_lion; |
127 | |
128 | say $full->pounds; |
129 | |
130 | =head1 DESCRIPTION |
131 | |
132 | This module is an extremely light-weight, high-performance L<Moose> replacement. |
133 | It also avoids depending on any XS modules to allow simple deployments. The |
134 | name C<Moo> is based on the idea that it provides almost -but not quite- two |
135 | thirds of L<Moose>. |
136 | |
137 | Unlike C<Mouse> this module does not aim at full L<Moose> compatibility. See |
138 | L</INCOMPATIBILITIES> for more details. |
139 | |
140 | =head1 IMPORTED METHODS |
141 | |
142 | =head2 new |
143 | |
144 | Foo::Bar->new( attr1 => 3 ); |
145 | |
146 | or |
147 | |
148 | Foo::Bar->new({ attr1 => 3 }); |
149 | |
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150 | =head2 BUILDARGS |
151 | |
152 | This feature from Moose is not yet supported. |
153 | |
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154 | =head2 BUILDALL |
155 | |
156 | Don't override (or probably even call) this method. Instead, you can define |
157 | a C<BUILD> method on your class and the constructor will automatically call the |
158 | C<BUILD> method from parent down to child after the object has been |
159 | instantiated. Typically this is used for object validation or possibly logging. |
160 | |
161 | =head2 does |
162 | |
163 | if ($foo->does('Some::Role1')) { |
164 | ... |
165 | } |
166 | |
167 | Returns true if the object composes in the passed role. |
168 | |
169 | =head1 IMPORTED SUBROUTINES |
170 | |
171 | =head2 extends |
172 | |
173 | extends 'Parent::Class'; |
174 | |
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175 | Declares base class. Multiple superclasses can be passed for multiple |
176 | inheritance (but please use roles instead). |
177 | |
178 | Calling extends more than once will REPLACE your superclasses, not add to |
179 | them like 'use base' would. |
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180 | |
181 | =head2 with |
182 | |
183 | with 'Some::Role1'; |
184 | with 'Some::Role2'; |
185 | |
186 | Composes a L<Role::Tiny> into current class. Only one role may be composed in |
187 | at a time to allow the code to remain as simple as possible. |
188 | |
189 | =head2 has |
190 | |
191 | has attr => ( |
192 | is => 'ro', |
193 | ); |
194 | |
195 | Declares an attribute for the class. |
196 | |
197 | The options for C<has> are as follows: |
198 | |
199 | =over 2 |
200 | |
201 | =item * is |
202 | |
203 | B<required>, must be C<ro> or C<rw>. Unsurprisingly, C<ro> generates an |
204 | accessor that will not respond to arguments; to be clear: a setter only. C<rw> |
205 | will create a perlish getter/setter. |
206 | |
207 | =item * isa |
208 | |
209 | Takes a coderef which is meant to validate the attribute. Unlike L<Moose> Moo |
210 | does not include a basic type system, so instead of doing C<< isa => 'Num' >>, |
211 | one should do |
212 | |
213 | isa => quote_sub q{ |
214 | die "$_[0] is not a number!" unless looks_like_number $_[0] |
215 | }, |
216 | |
217 | L<Sub::Quote aware|/SUB QUOTE AWARE> |
218 | |
219 | =item * coerce |
220 | |
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221 | This Moose feature is not yet supported |
222 | |
223 | =begin hide |
224 | |
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225 | Takes a coderef which is meant to coerce the attribute. The basic idea is to |
226 | do something like the following: |
227 | |
228 | coerce => quote_sub q{ |
229 | $_[0] + 1 unless $_[0] % 2 |
230 | }, |
231 | |
232 | L<Sub::Quote aware|/SUB QUOTE AWARE> |
233 | |
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234 | =end hide |
235 | |
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236 | =item * trigger |
237 | |
238 | Takes a coderef which will get called any time the attribute is set. Coderef |
239 | will be invoked against the object with the new value as an argument. |
240 | |
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241 | Note that Moose also passes the old value, if any; this feature is not yet |
242 | supported. |
243 | |
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244 | L<Sub::Quote aware|/SUB QUOTE AWARE> |
245 | |
246 | =item * default |
247 | |
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248 | Takes a coderef which will get called with $self as its only argument |
249 | to populate an attribute if no value is supplied to the constructor - or |
250 | if the attribute is lazy, when the attribute is first retrieved if no |
251 | value has yet been provided. |
252 | |
253 | Note that if your default is fired during new() there is no guarantee that |
254 | other attributes have been populated yet so you should not rely on their |
255 | existence. |
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256 | |
257 | L<Sub::Quote aware|/SUB QUOTE AWARE> |
258 | |
259 | =item * predicate |
260 | |
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261 | Takes a method name which will return true if an attribute has a value. |
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262 | |
263 | A common example of this would be to call it C<has_$foo>, implying that the |
264 | object has a C<$foo> set. |
265 | |
266 | =item * builder |
267 | |
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268 | Takes a method name which will be called to create the attribute - functions |
269 | exactly like default except that instead of calling |
270 | |
271 | $default->($self); |
272 | |
273 | Moo will call |
274 | |
275 | $self->$builder; |
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276 | |
277 | =item * clearer |
278 | |
279 | Takes a method name which will clear the attribute. |
280 | |
281 | =item * lazy |
282 | |
283 | B<Boolean>. Set this if you want values for the attribute to be grabbed |
284 | lazily. This is usually a good idea if you have a L</builder> which requires |
285 | another attribute to be set. |
286 | |
287 | =item * required |
288 | |
289 | B<Boolean>. Set this if the attribute must be passed on instantiation. |
290 | |
291 | =item * weak_ref |
292 | |
293 | B<Boolean>. Set this if you want the reference that the attribute contains to |
294 | be weakened; use this when circular references are possible, which will cause |
295 | leaks. |
296 | |
297 | =item * init_arg |
298 | |
299 | Takes the name of the key to look for at instantiation time of the object. A |
300 | common use of this is to make an underscored attribute have a non-underscored |
301 | initialization name. C<undef> means that passing the value in on instantiation |
302 | |
303 | =back |
304 | |
305 | =head2 before |
306 | |
307 | before foo => sub { ... }; |
308 | |
309 | See L<< Class::Method::Modifiers/before method(s) => sub { ... } >> for full |
310 | documentation. |
311 | |
312 | =head2 around |
313 | |
314 | around foo => sub { ... }; |
315 | |
316 | See L<< Class::Method::Modifiers/around method(s) => sub { ... } >> for full |
317 | documentation. |
318 | |
319 | =head2 after |
320 | |
321 | after foo => sub { ... }; |
322 | |
323 | See L<< Class::Method::Modifiers/after method(s) => sub { ... } >> for full |
324 | documentation. |
325 | |
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326 | =head1 SUB QUOTE AWARE |
327 | |
328 | L<Sub::Quote/quote_sub> allows us to create coderefs that are "inlineable," |
329 | giving us a handy, XS-free speed boost. Any option that is L<Sub::Quote> |
330 | aware can take advantage of this. |
331 | |
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332 | =head1 INCOMPATIBILITIES WITH MOOSE |
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333 | |
334 | You can only compose one role at a time. If your application is large or |
335 | complex enough to warrant complex composition, you wanted L<Moose>. |
336 | |
337 | There is no complex type system. C<isa> is verified with a coderef, if you |
338 | need complex types, just make a library of coderefs, or better yet, functions |
339 | that return quoted subs. |
340 | |
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341 | C<initializer> is not supported in core since the author considers it to be a |
342 | bad idea but may be supported by an extension in future. |
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343 | |
344 | There is no meta object. If you need this level of complexity you wanted |
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345 | L<Moose> - Moo succeeds at being small because it explicitly does not |
346 | provide a metaprotocol. |
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347 | |
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348 | No support for C<super>, C<override>, C<inner>, or C<augment> - override can |
349 | be handled by around albeit with a little more typing, and the author considers |
350 | augment to be a bad idea. |
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351 | |
352 | L</default> only supports coderefs, because doing otherwise is usually a |
353 | mistake anyway. |
354 | |
355 | C<lazy_build> is not supported per se, but of course it will work if you |
356 | manually set all the options it implies. |
357 | |
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358 | C<auto_deref> is not supported since the author considers it a bad idea. |
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359 | |
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360 | C<documentation> is not supported since it's a very poor replacement for POD. |