6 our $VERSION = '0.009001'; # 0.9.1
7 $VERSION = eval $VERSION;
15 return if $MAKERS{$target}; # already exported into this package
16 *{_getglob("${target}::extends")} = sub {
17 _load_module($_) for @_;
18 # Can't do *{...} = \@_ or 5.10.0's mro.pm stops seeing @ISA
19 @{*{_getglob("${target}::ISA")}{ARRAY}} = @_;
21 *{_getglob("${target}::with")} = sub {
23 die "Only one role supported at a time by with" if @_ > 1;
24 Moo::Role->apply_role_to_package($target, $_[0]);
26 $MAKERS{$target} = {};
27 *{_getglob("${target}::has")} = sub {
28 my ($name, %spec) = @_;
29 ($MAKERS{$target}{accessor} ||= do {
30 require Method::Generate::Accessor;
31 Method::Generate::Accessor->new
32 })->generate_method($target, $name, \%spec);
33 $class->_constructor_maker_for($target)
34 ->register_attribute_specs($name, \%spec);
36 foreach my $type (qw(before after around)) {
37 *{_getglob "${target}::${type}"} = sub {
38 require Class::Method::Modifiers;
39 _install_modifier($target, $type, @_);
44 @{"${target}::ISA"} = do {
45 require Moo::Object; ('Moo::Object');
46 } unless @{"${target}::ISA"};
50 sub _constructor_maker_for {
51 my ($class, $target) = @_;
52 return unless $MAKERS{$target};
53 $MAKERS{$target}{constructor} ||= do {
54 require Method::Generate::Constructor;
55 Method::Generate::Constructor
58 accessor_generator => do {
59 require Method::Generate::Accessor;
60 Method::Generate::Accessor->new;
64 ->register_attribute_specs(do {
66 # using the -last- entry in @ISA means that classes created by
67 # Role::Tiny as N roles + superclass will still get the attributes
69 if (my $super = do { no strict 'refs'; ${"${target}::ISA"}[-1] }) {
70 if (my $con = $MAKERS{$super}{constructor}) {
71 @spec = %{$con->all_attribute_specs};
83 Moo - Minimalist Object Orientation (with Moose compatiblity)
85 =head1 WARNING WARNING WARNING
87 This is a 0.9 release because we're fairly sure it works. For us. Until it's
88 tested in the wild, we make no guarantees it also works for you.
90 If this module does something unexpected, please submit a failing test.
92 But if it eats your cat, sleeps with your boyfriend, or pushes grandma down
93 the stairs to save her from the terrible secret of space, it's not our fault.
104 my $amount = shift || 1;
106 $self->pounds( $self->pounds - $amount );
116 die "Only SWEET-TREATZ supported!" unless $_[0] eq 'SWEET-TREATZ'
122 isa => quote_sub q{ die "$_[0] is too much cat food!" unless $_[0] < 15 },
129 my $full = Cat::Food->new(
130 taste => 'DELICIOUS.',
131 brand => 'SWEET-TREATZ',
141 This module is an extremely light-weight, high-performance L<Moose> replacement.
142 It also avoids depending on any XS modules to allow simple deployments. The
143 name C<Moo> is based on the idea that it provides almost -but not quite- two
146 Unlike C<Mouse> this module does not aim at full L<Moose> compatibility. See
147 L</INCOMPATIBILITIES> for more details.
149 =head1 IMPORTED METHODS
153 Foo::Bar->new( attr1 => 3 );
157 Foo::Bar->new({ attr1 => 3 });
161 This feature from Moose is not yet supported.
165 Don't override (or probably even call) this method. Instead, you can define
166 a C<BUILD> method on your class and the constructor will automatically call the
167 C<BUILD> method from parent down to child after the object has been
168 instantiated. Typically this is used for object validation or possibly logging.
172 if ($foo->does('Some::Role1')) {
176 Returns true if the object composes in the passed role.
178 =head1 IMPORTED SUBROUTINES
182 extends 'Parent::Class';
184 Declares base class. Multiple superclasses can be passed for multiple
185 inheritance (but please use roles instead).
187 Calling extends more than once will REPLACE your superclasses, not add to
188 them like 'use base' would.
195 Composes a L<Role::Tiny> into current class. Only one role may be composed in
196 at a time to allow the code to remain as simple as possible.
204 Declares an attribute for the class.
206 The options for C<has> are as follows:
212 B<required>, must be C<ro> or C<rw>. Unsurprisingly, C<ro> generates an
213 accessor that will not respond to arguments; to be clear: a setter only. C<rw>
214 will create a perlish getter/setter.
218 Takes a coderef which is meant to validate the attribute. Unlike L<Moose> Moo
219 does not include a basic type system, so instead of doing C<< isa => 'Num' >>,
223 die "$_[0] is not a number!" unless looks_like_number $_[0]
226 L<Sub::Quote aware|/SUB QUOTE AWARE>
230 This Moose feature is not yet supported
234 Takes a coderef which is meant to coerce the attribute. The basic idea is to
235 do something like the following:
237 coerce => quote_sub q{
238 $_[0] + 1 unless $_[0] % 2
241 L<Sub::Quote aware|/SUB QUOTE AWARE>
247 Takes a coderef which will get called any time the attribute is set. Coderef
248 will be invoked against the object with the new value as an argument.
250 Note that Moose also passes the old value, if any; this feature is not yet
253 L<Sub::Quote aware|/SUB QUOTE AWARE>
257 Takes a coderef which will get called with $self as its only argument
258 to populate an attribute if no value is supplied to the constructor - or
259 if the attribute is lazy, when the attribute is first retrieved if no
260 value has yet been provided.
262 Note that if your default is fired during new() there is no guarantee that
263 other attributes have been populated yet so you should not rely on their
266 L<Sub::Quote aware|/SUB QUOTE AWARE>
270 Takes a method name which will return true if an attribute has a value.
272 A common example of this would be to call it C<has_$foo>, implying that the
273 object has a C<$foo> set.
277 Takes a method name which will be called to create the attribute - functions
278 exactly like default except that instead of calling
288 Takes a method name which will clear the attribute.
292 B<Boolean>. Set this if you want values for the attribute to be grabbed
293 lazily. This is usually a good idea if you have a L</builder> which requires
294 another attribute to be set.
298 B<Boolean>. Set this if the attribute must be passed on instantiation.
302 B<Boolean>. Set this if you want the reference that the attribute contains to
303 be weakened; use this when circular references are possible, which will cause
308 Takes the name of the key to look for at instantiation time of the object. A
309 common use of this is to make an underscored attribute have a non-underscored
310 initialization name. C<undef> means that passing the value in on instantiation
316 before foo => sub { ... };
318 See L<< Class::Method::Modifiers/before method(s) => sub { ... } >> for full
323 around foo => sub { ... };
325 See L<< Class::Method::Modifiers/around method(s) => sub { ... } >> for full
330 after foo => sub { ... };
332 See L<< Class::Method::Modifiers/after method(s) => sub { ... } >> for full
335 =head1 SUB QUOTE AWARE
337 L<Sub::Quote/quote_sub> allows us to create coderefs that are "inlineable,"
338 giving us a handy, XS-free speed boost. Any option that is L<Sub::Quote>
339 aware can take advantage of this.
341 =head1 INCOMPATIBILITIES WITH MOOSE
343 You can only compose one role at a time. If your application is large or
344 complex enough to warrant complex composition, you wanted L<Moose>.
346 There is no complex type system. C<isa> is verified with a coderef, if you
347 need complex types, just make a library of coderefs, or better yet, functions
348 that return quoted subs.
350 C<initializer> is not supported in core since the author considers it to be a
351 bad idea but may be supported by an extension in future.
353 There is no meta object. If you need this level of complexity you wanted
354 L<Moose> - Moo succeeds at being small because it explicitly does not
355 provide a metaprotocol.
357 No support for C<super>, C<override>, C<inner>, or C<augment> - override can
358 be handled by around albeit with a little more typing, and the author considers
359 augment to be a bad idea.
361 L</default> only supports coderefs, because doing otherwise is usually a
364 C<lazy_build> is not supported per se, but of course it will work if you
365 manually set all the options it implies.
367 C<auto_deref> is not supported since the author considers it a bad idea.
369 C<documentation> is not supported since it's a very poor replacement for POD.