4 use Mouse::Exporter; # enables strict and warnings
9 use Scalar::Util qw(blessed);
11 use Mouse::Util qw(load_class is_class_loaded get_code_package not_supported);
13 use Mouse::Meta::Module;
14 use Mouse::Meta::Class;
15 use Mouse::Meta::Role;
16 use Mouse::Meta::Attribute;
18 use Mouse::Util::TypeConstraints ();
20 Mouse::Exporter->setup_import_methods(
28 \&Scalar::Util::blessed,
35 Mouse::Meta::Class->initialize(scalar caller)->superclasses(@_);
40 Mouse::Util::apply_all_roles(scalar(caller), @_);
45 my $meta = Mouse::Meta::Class->initialize(scalar caller);
48 $meta->throw_error(q{Usage: has 'name' => ( key => value, ... )})
49 if @_ % 2; # odd number of arguments
51 if(ref $name){ # has [qw(foo bar)] => (...)
53 $meta->add_attribute($_ => @_);
56 else{ # has foo => (...)
57 $meta->add_attribute($name => @_);
63 my $meta = Mouse::Meta::Class->initialize(scalar caller);
65 for my $name($meta->_collect_methods(@_)) {
66 $meta->add_before_method_modifier($name => $code);
72 my $meta = Mouse::Meta::Class->initialize(scalar caller);
74 for my $name($meta->_collect_methods(@_)) {
75 $meta->add_after_method_modifier($name => $code);
81 my $meta = Mouse::Meta::Class->initialize(scalar caller);
83 for my $name($meta->_collect_methods(@_)) {
84 $meta->add_around_method_modifier($name => $code);
94 # This check avoids a recursion loop - see
95 # t/100_bugs/020_super_recursion.t
96 return if defined $SUPER_PACKAGE && $SUPER_PACKAGE ne caller();
97 return if !defined $SUPER_BODY;
98 $SUPER_BODY->(@SUPER_ARGS);
102 # my($name, $method) = @_;
103 Mouse::Meta::Class->initialize(scalar caller)->add_override_method_modifier(@_);
111 if ( my $body = $INNER_BODY{$pkg} ) {
112 my $args = $INNER_ARGS{$pkg};
113 local $INNER_ARGS{$pkg};
114 local $INNER_BODY{$pkg};
115 return $body->(@{$args});
123 #my($name, $method) = @_;
124 Mouse::Meta::Class->initialize(scalar caller)->add_augment_method_modifier(@_);
132 my $class = $args{for_class}
133 or confess("Cannot call init_meta without specifying a for_class");
135 my $base_class = $args{base_class} || 'Mouse::Object';
136 my $metaclass = $args{metaclass} || 'Mouse::Meta::Class';
138 my $meta = $metaclass->initialize($class);
140 $meta->add_method(meta => sub{
141 return $metaclass->initialize(ref($_[0]) || $_[0]);
144 $meta->superclasses($base_class)
145 unless $meta->superclasses;
147 # make a class type for each Mouse class
148 Mouse::Util::TypeConstraints::class_type($class)
149 unless Mouse::Util::TypeConstraints::find_type_constraint($class);
159 Mouse - Moose minus the antlers
163 This document describes Mouse version 0.50
168 use Mouse; # automatically turns on strict and warnings
170 has 'x' => (is => 'rw', isa => 'Int');
171 has 'y' => (is => 'rw', isa => 'Int');
184 has 'z' => (is => 'rw', isa => 'Int');
186 after 'clear' => sub {
193 L<Moose> is wonderful. B<Use Moose instead of Mouse.>
195 Unfortunately, Moose has a compile-time penalty. Though significant progress
196 has been made over the years, the compile time penalty is a non-starter for
197 some very specific applications. If you are writing a command-line application
198 or CGI script where startup time is essential, you may not be able to use
199 Moose. We recommend that you instead use L<HTTP::Engine> and FastCGI for the
202 Mouse aims to alleviate this by providing a subset of Moose's functionality,
205 We're also going as light on dependencies as possible. Mouse currently has
206 B<no dependencies> except for testing modules.
208 =head2 MOOSE COMPATIBILITY
210 Compatibility with Moose has been the utmost concern. Fewer than 1% of the
211 tests fail when run against Moose instead of Mouse. Mouse code coverage is also
212 over 96%. Even the error messages are taken from Moose. The Mouse code just
213 runs the test suite 4x faster.
215 The idea is that, if you need the extra power, you should be able to run
216 C<s/Mouse/Moose/g> on your codebase and have nothing break. To that end,
217 we have written L<Any::Moose> which will act as Mouse unless Moose is loaded,
218 in which case it will act as Moose. Since Mouse is a little sloppier than
219 Moose, if you run into weird errors, it would be worth running:
221 ANY_MOOSE=Moose perl your-script.pl
223 to see if the bug is caused by Mouse. Moose's diagnostics and validation are
226 See also L<Mouse::Spec> for compatibility and incompatibility with Moose.
230 Please don't copy MooseX code to MouseX. If you need extensions, you really
231 should upgrade to Moose. We don't need two parallel sets of extensions!
233 If you really must write a Mouse extension, please contact the Moose mailing
234 list or #moose on IRC beforehand.
238 =head2 C<< $object->meta -> Mouse::Meta::Class >>
240 Returns this class' metaclass instance.
242 =head2 C<< extends superclasses >>
244 Sets this class' superclasses.
246 =head2 C<< before (method|methods|regexp) => CodeRef >>
248 Installs a "before" method modifier. See L<Moose/before>.
250 =head2 C<< after (method|methods|regexp) => CodeRef >>
252 Installs an "after" method modifier. See L<Moose/after>.
254 =head2 C<< around (method|methods|regexp) => CodeRef >>
256 Installs an "around" method modifier. See L<Moose/around>.
258 =head2 C<< has (name|names) => parameters >>
260 Adds an attribute (or if passed an arrayref of names, multiple attributes) to
265 =item C<< is => ro|rw|bare >>
267 The I<is> option accepts either I<rw> (for read/write), I<ro> (for read
268 only) or I<bare> (for nothing). These will create either a read/write accessor
269 or a read-only accessor respectively, using the same name as the C<$name> of
272 If you need more control over how your accessors are named, you can
273 use the C<reader>, C<writer> and C<accessor> options, however if you
274 use those, you won't need the I<is> option.
276 =item C<< isa => TypeName | ClassName >>
278 Provides type checking in the constructor and accessor. The following types are
279 supported. Any unknown type is taken to be a class check
280 (e.g. C<< isa => 'DateTime' >> would accept only L<DateTime> objects).
282 Any Item Bool Undef Defined Value Num Int Str ClassName
283 Ref ScalarRef ArrayRef HashRef CodeRef RegexpRef GlobRef
286 For more documentation on type constraints, see L<Mouse::Util::TypeConstraints>.
288 =item C<< does => RoleName >>
290 This will accept the name of a role which the value stored in this attribute
291 is expected to have consumed.
293 =item C<< coerce => Bool >>
295 This will attempt to use coercion with the supplied type constraint to change
296 the value passed into any accessors or constructors. You B<must> have supplied
297 a type constraint in order for this to work. See L<Moose::Cookbook::Basics::Recipe5>
300 =item C<< required => Bool >>
302 Whether this attribute is required to have a value. If the attribute is lazy or
303 has a builder, then providing a value for the attribute in the constructor is
306 =item C<< init_arg => Str | Undef >>
308 Allows you to use a different key name in the constructor. If undef, the
309 attribute can't be passed to the constructor.
311 =item C<< default => Value | CodeRef >>
313 Sets the default value of the attribute. If the default is a coderef, it will
314 be invoked to get the default value. Due to quirks of Perl, any bare reference
315 is forbidden, you must wrap the reference in a coderef. Otherwise, all
316 instances will share the same reference.
318 =item C<< lazy => Bool >>
320 If specified, the default is calculated on demand instead of in the
323 =item C<< predicate => Str >>
325 Lets you specify a method name for installing a predicate method, which checks
326 that the attribute has a value. It will not invoke a lazy default or builder
329 =item C<< clearer => Str >>
331 Lets you specify a method name for installing a clearer method, which clears
332 the attribute's value from the instance. On the next read, lazy or builder will
335 =item C<< handles => HashRef|ArrayRef|Regexp >>
337 Lets you specify methods to delegate to the attribute. ArrayRef forwards the
338 given method names to method calls on the attribute. HashRef maps local method
339 names to remote method names called on the attribute. Other forms of
340 L</handles>, such as RoleName and CodeRef, are not yet supported.
342 =item C<< weak_ref => Bool >>
344 Lets you automatically weaken any reference stored in the attribute.
346 Use of this feature requires L<Scalar::Util>!
348 =item C<< trigger => CodeRef >>
350 Any time the attribute's value is set (either through the accessor or the constructor), the trigger is called on it. The trigger receives as arguments the instance, the new value, and the attribute instance.
352 =item C<< builder => Str >>
354 Defines a method name to be called to provide the default value of the
355 attribute. C<< builder => 'build_foo' >> is mostly equivalent to
356 C<< default => sub { $_[0]->build_foo } >>.
358 =item C<< auto_deref => Bool >>
360 Allows you to automatically dereference ArrayRef and HashRef attributes in list
361 context. In scalar context, the reference is returned (NOT the list length or
362 bucket status). You must specify an appropriate type constraint to use
365 =item C<< lazy_build => Bool >>
367 Automatically define the following options:
372 builder => "_build_$attr",
373 clearer => "clear_$attr",
374 predicate => "has_$attr",
379 =head2 C<< confess(message) -> BOOM >>
381 L<Carp/confess> for your convenience.
383 =head2 C<< blessed(value) -> ClassName | undef >>
385 L<Scalar::Util/blessed> for your convenience.
391 Importing Mouse will default your class' superclass list to L<Mouse::Object>.
392 You may use L</extends> to replace the superclass list.
396 Please unimport Mouse (C<no Mouse>) so that if someone calls one of the
397 keywords (such as L</extends>) it will break loudly instead breaking subtly.
401 If you use Mouse::XS you might see a fatal error on callbacks
402 which include C<eval 'BEGIN{ die }'>, which typically occurs in such code
403 as C<eval 'use NotInstalledModule'>. This is not
404 a bug in Mouse. In fact, it is a bug in Perl (RT #69939).
406 To work around this problem, surround C<eval STRING> with C<eval BLOCK>:
409 # eval 'use NotInstalledModule'; # NG
410 eval{ eval 'use NotInstalledModule' }; # OK
413 It seems ridiculous, but it works as you expected.
415 =head1 SOURCE CODE ACCESS
417 We have a public git repository:
419 git clone git://git.moose.perl.org/Mouse.git
439 Shawn M Moore E<lt>sartak at gmail.comE<gt>
441 Yuval Kogman E<lt>nothingmuch at woobling.orgE<gt>
449 Goro Fuji (gfx) E<lt>gfuji at cpan.orgE<gt>
451 with plenty of code borrowed from L<Class::MOP> and L<Moose>
455 All complex software has bugs lurking in it, and this module is no exception.
456 Please report any bugs to C<bug-mouse at rt.cpan.org>, or through the web
457 interface at L<http://rt.cpan.org/Public/Dist/Display.html?Name=Mouse>
459 =head1 COPYRIGHT AND LICENSE
461 Copyright (c) 2008-2010 Infinity Interactive, Inc.
463 http://www.iinteractive.com/
465 This program is free software; you can redistribute it and/or modify it
466 under the same terms as Perl itself.