11 use Scalar::Util 'blessed';
13 use Mouse::Meta::Attribute;
14 use Mouse::Meta::Class;
16 use Mouse::TypeRegistry;
23 my $meta = Mouse::Meta::Class->initialize($CALLER);
30 $caller->meta->superclasses(@_);
38 $names = [$names] if !ref($names);
40 for my $name (@$names) {
41 Mouse::Meta::Attribute->create($package, $name, @_);
55 my $exporter = Sub::Exporter::build_exporter({
57 groups => { default => [':all'] },
66 my $meta = Mouse::Meta::Class->initialize($CALLER);
67 $meta->superclasses('Mouse::Object')
68 unless $meta->superclasses;
77 for my $keyword (keys %exports) {
78 next if $keyword eq 'meta'; # we don't delete this one
79 delete ${ $caller . '::' }{$keyword};
87 if (ref($class) || !defined($class) || !length($class)) {
88 my $display = defined($class) ? $class : 'undef';
89 confess "Invalid class name ($display)";
92 return 1 if is_class_loaded($class);
94 (my $file = "$class.pm") =~ s{::}{/}g;
96 eval { CORE::require($file) };
97 confess "Could not load class ($class) because : $@" if $@;
102 sub is_class_loaded {
105 return 0 if ref($class) || !defined($class) || !length($class);
107 # walk the symbol table tree to avoid autovififying
108 # \*{${main::}{"Foo::"}} == \*main::Foo::
111 foreach my $part (split('::', $class)) {
112 return 0 unless exists ${$$pack}{"${part}::"};
113 $pack = \*{${$$pack}{"${part}::"}};
116 # check for $VERSION or @ISA
117 return 1 if exists ${$$pack}{VERSION}
118 && defined *{${$$pack}{VERSION}}{SCALAR};
119 return 1 if exists ${$$pack}{ISA}
120 && defined *{${$$pack}{ISA}}{ARRAY};
122 # check for any method
123 foreach ( keys %{$$pack} ) {
124 next if substr($_, -2, 2) eq '::';
125 return 1 if defined *{${$$pack}{$_}}{CODE};
138 Mouse - Moose minus the antlers
142 Version 0.02 released 11 Jun 08
147 use Mouse; # automatically turns on strict and warnings
149 has 'x' => (is => 'rw', isa => 'Int');
150 has 'y' => (is => 'rw', isa => 'Int');
163 has 'z' => (is => 'rw', isa => 'Int');
165 # not implemented yet :)
166 #after 'clear' => sub {
173 L<Moose> is wonderful.
175 Unfortunately, it's a little slow. Though significant progress has been made
176 over the years, the compile time penalty is a non-starter for some
179 Mouse aims to alleviate this by providing a subset of Moose's
180 functionality, faster. In particular, L<Moose/has> is missing only a few
181 expert-level features.
185 Compatibility with Moose has been the utmost concern. Fewer than 1% of the
186 tests fail when run against Moose instead of Mouse. Mouse code coverage is also
187 over 99%. Even the error messages are taken from Moose. The Mouse code just
188 runs the test suite 3x-4x faster.
190 The idea is that, if you need the extra power, you should be able to run
191 C<s/Mouse/Moose/g> on your codebase and have nothing break. To that end,
192 nothingmuch has written L<Squirrel> (part of this distribution) which will act
193 as Mouse unless Moose is loaded, in which case it will act as Moose.
195 Mouse also has the blessings of Moose's author, stevan.
197 =head2 MISSING FEATURES
199 =head3 Method modifiers
201 Fixing this one next, with a reimplementation of L<Class::Method::Modifiers>.
205 Fixing this one slightly less soon. stevan has suggested an implementation
206 strategy. Mouse currently mostly ignores methods.
210 User-defined type constraints and parameterized types may be implemented. Type
211 coercions probably not (patches welcome).
213 =head3 Bootstrapped meta world
215 Very handy for extensions to the MOP. Not pressing, but would be nice to have.
217 =head3 Modification of attribute metaclass
219 When you declare an attribute with L</has>, you get the inlined accessors
220 installed immediately. Modifying the attribute metaclass, even if possible,
229 =head2 meta -> Mouse::Meta::Class
231 Returns this class' metaclass instance.
233 =head2 extends superclasses
235 Sets this class' superclasses.
237 =head2 has (name|names) => parameters
239 Adds an attribute (or if passed an arrayref of names, multiple attributes) to
246 If specified, inlines a read-only/read-write accessor with the same name as
249 =item isa => TypeConstraint
251 Provides basic type checking in the constructor and accessor. Basic types such
252 as C<Int>, C<ArrayRef>, C<Defined> are supported. Any unknown type is taken to
253 be a class check (e.g. isa => 'DateTime' would accept only L<DateTime>
256 =item required => 0|1
258 Whether this attribute is required to have a value. If the attribute is lazy or
259 has a builder, then providing a value for the attribute in the constructor is
262 =item init_arg => Str
264 Allows you to use a different key name in the constructor.
266 =item default => Value | CodeRef
268 Sets the default value of the attribute. If the default is a coderef, it will
269 be invoked to get the default value. Due to quirks of Perl, any bare reference
270 is forbidden, you must wrap the reference in a coderef. Otherwise, all
271 instances will share the same reference.
275 If specified, the default is calculated on demand instead of in the
278 =item predicate => Str
280 Lets you specify a method name for installing a predicate method, which checks
281 that the attribute has a value. It will not invoke a lazy default or builder
286 Lets you specify a method name for installing a clearer method, which clears
287 the attribute's value from the instance. On the next read, lazy or builder will
290 =item handles => HashRef|ArrayRef
292 Lets you specify methods to delegate to the attribute. ArrayRef forwards the
293 given method names to method calls on the attribute. HashRef maps local method
294 names to remote method names called on the attribute. Other forms of
295 L</handles>, such as regular expression and coderef, are not yet supported.
297 =item weak_ref => 0|1
299 Lets you automatically weaken any reference stored in the attribute.
301 =item trigger => Coderef
303 Any time the attribute's value is set (either through the accessor or the
304 constructor), the trigger is called on it. The trigger receives as arguments
305 the instance, the new value, and the attribute instance.
309 Defines a method name to be called to provide the default value of the
310 attribute. C<< builder => 'build_foo' >> is mostly equivalent to
311 C<< default => sub { $_[0]->build_foo } >>.
313 =item auto_deref => 0|1
315 Allows you to automatically dereference ArrayRef and HashRef attributes in list
316 context. In scalar context, the reference is returned (NOT the list length or
317 bucket status). You must specify an appropriate type constraint to use
322 =head2 confess error -> BOOM
324 L<Carp/confess> for your convenience.
326 =head2 blessed value -> ClassName | undef
328 L<Scalar::Util/blessed> for your convenience.
334 Importing Mouse will default your class' superclass list to L<Mouse::Object>.
335 You may use L</extends> to replace the superclass list.
339 Please unimport Mouse (C<no Mouse>) so that if someone calls one of the
340 keywords (such as L</extends>) it will break loudly instead breaking subtly.
344 =head2 load_class Class::Name
346 This will load a given C<Class::Name> (or die if it's not loadable).
347 This function can be used in place of tricks like
348 C<eval "use $module"> or using C<require>.
350 =head2 is_class_loaded Class::Name -> Bool
352 Returns whether this class is actually loaded or not. It uses a heuristic which
353 involves checking for the existence of C<$VERSION>, C<@ISA>, and any
354 locally-defined method.
358 Shawn M Moore, C<< <sartak at gmail.com> >>
360 with plenty of code borrowed from L<Class::MOP> and L<Moose>
366 Please report any bugs through RT: email
367 C<bug-mouse at rt.cpan.org>, or browse
368 L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Mouse>.
370 =head1 COPYRIGHT AND LICENSE
372 Copyright 2008 Shawn M Moore.
374 This program is free software; you can redistribute it and/or modify it
375 under the same terms as Perl itself.