X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=gitmo%2FMoo.git;a=blobdiff_plain;f=lib%2FMoo.pm;h=fdd46e214ab91c0cabb495fc84b39ec471279faf;hp=2034459d68b6d2477a1cd16d861e1e771aaa087d;hb=141b507ace5957c098c52ceb7afaf21d5928a02d;hpb=346177bab5c218a8c4a77180e4f9f1317251de55 diff --git a/lib/Moo.pm b/lib/Moo.pm index 2034459..fdd46e2 100644 --- a/lib/Moo.pm +++ b/lib/Moo.pm @@ -5,50 +5,52 @@ use Moo::_Utils; use B 'perlstring'; use Sub::Defer (); -our $VERSION = '0.091009'; # 0.91.9 +our $VERSION = '1.000005'; # 1.0.5 $VERSION = eval $VERSION; require Moo::sification; our %MAKERS; +sub _install_tracked { + my ($target, $name, $code) = @_; + $MAKERS{$target}{exports}{$name} = $code; + _install_coderef "${target}::${name}" => "Moo::${name}" => $code; +} + sub import { my $target = caller; my $class = shift; strictures->import; return if $MAKERS{$target}; # already exported into this package - _install_coderef "${target}::extends" => "Moo::extends" => sub { - _load_module($_) for @_; - # Can't do *{...} = \@_ or 5.10.0's mro.pm stops seeing @ISA - @{*{_getglob("${target}::ISA")}{ARRAY}} = @_; - if (my $old = delete $Moo::MAKERS{$target}{constructor}) { - delete _getstash($target)->{new}; - Moo->_constructor_maker_for($target) - ->register_attribute_specs(%{$old->all_attribute_specs}); - } - $Moo::HandleMoose::MOUSE{$target} = [ - grep defined, map Mouse::Util::find_meta($_), @_ - ] if $INC{"Mouse.pm"}; + $MAKERS{$target} = {}; + _install_tracked $target => extends => sub { + $class->_set_superclasses($target, @_); $class->_maybe_reset_handlemoose($target); return; }; - _install_coderef "${target}::with" => "Moo::with" => sub { + _install_tracked $target => with => sub { require Moo::Role; Moo::Role->apply_roles_to_package($target, @_); $class->_maybe_reset_handlemoose($target); }; - $MAKERS{$target} = {}; - _install_coderef "${target}::has" => "Moo::has" => sub { - my ($name, %spec) = @_; - $class->_constructor_maker_for($target) - ->register_attribute_specs($name, \%spec); - $class->_accessor_maker_for($target) - ->generate_method($target, $name, \%spec); - $class->_maybe_reset_handlemoose($target); + _install_tracked $target => has => sub { + my ($name_proto, %spec) = @_; + my $name_isref = ref $name_proto eq 'ARRAY'; + foreach my $name ($name_isref ? @$name_proto : $name_proto) { + # Note that when $name_proto is an arrayref, each attribute + # needs a separate \%specs hashref + my $spec_ref = $name_isref ? +{%spec} : \%spec; + $class->_constructor_maker_for($target) + ->register_attribute_specs($name, $spec_ref); + $class->_accessor_maker_for($target) + ->generate_method($target, $name, $spec_ref); + $class->_maybe_reset_handlemoose($target); + } return; }; foreach my $type (qw(before after around)) { - _install_coderef "${target}::${type}" => "Moo::${type}" => sub { + _install_tracked $target => $type => sub { require Class::Method::Modifiers; _install_modifier($target, $type, @_); return; @@ -65,6 +67,34 @@ sub import { } } +sub unimport { + my $target = caller; + _unimport_coderefs($target, $MAKERS{$target}); +} + +sub _set_superclasses { + my $class = shift; + my $target = shift; + foreach my $superclass (@_) { + _load_module($superclass); + if ($INC{"Role/Tiny.pm"} && $Role::Tiny::INFO{$superclass}) { + require Carp; + Carp::croak("Can't extend role '$superclass'"); + } + } + # Can't do *{...} = \@_ or 5.10.0's mro.pm stops seeing @ISA + @{*{_getglob("${target}::ISA")}{ARRAY}} = @_; + if (my $old = delete $Moo::MAKERS{$target}{constructor}) { + delete _getstash($target)->{new}; + Moo->_constructor_maker_for($target) + ->register_attribute_specs(%{$old->all_attribute_specs}); + } + no warnings 'once'; # piss off. -- mst + $Moo::HandleMoose::MOUSE{$target} = [ + grep defined, map Mouse::Util::find_meta($_), @_ + ] if $INC{"Mouse.pm"}; +} + sub _maybe_reset_handlemoose { my ($class, $target) = @_; if ($INC{"Moo/HandleMoose.pm"}) { @@ -138,7 +168,7 @@ sub _constructor_maker_for { .' '.$class.'->_constructor_maker_for($class,'.perlstring($target).');'."\n" .' return $class->new(@_)'.";\n" .' } elsif ($INC{"Moose.pm"} and my $meta = Class::MOP::get_metaclass_by_name($class)) {'."\n" - .' return $meta->new_object(@_);'."\n" + .' return $meta->new_object($class->BUILDARGS(@_));'."\n" .' }'."\n" ), ) @@ -161,7 +191,6 @@ Moo - Minimalist Object Orientation (with Moose compatiblity) package Cat::Food; use Moo; - use Sub::Quote; sub feed_lion { my $self = shift; @@ -183,12 +212,12 @@ Moo - Minimalist Object Orientation (with Moose compatiblity) has pounds => ( is => 'rw', - isa => quote_sub q{ die "$_[0] is too much cat food!" unless $_[0] < 15 }, + isa => sub { die "$_[0] is too much cat food!" unless $_[0] < 15 }, ); 1; -and else where +And elsewhere: my $full = Cat::Food->new( taste => 'DELICIOUS.', @@ -202,62 +231,97 @@ and else where =head1 DESCRIPTION -This module is an extremely light-weight, high-performance L replacement. +This module is an extremely light-weight subset of L optimised for +rapid startup and "pay only for what you use". + It also avoids depending on any XS modules to allow simple deployments. The -name C is based on the idea that it provides almost -but not quite- two +name C is based on the idea that it provides almost -- but not quite -- two thirds of L. -Unlike C this module does not aim at full L compatibility. See -L for more details. +Unlike L this module does not aim at full compatibility with +L's surface syntax, preferring instead of provide full interoperability +via the metaclass inflation capabilities described in L. + +For a full list of the minor differences between L and L's surface +syntax, see L. =head1 WHY MOO EXISTS If you want a full object system with a rich Metaprotocol, L is already wonderful. +However, sometimes you're writing a command line script or a CGI script +where fast startup is essential, or code designed to be deployed as a single +file via L, or you're writing a CPAN module and you want it +to be usable by people with those constraints. + I've tried several times to use L but it's 3x the size of Moo and takes longer to load than most of my Moo based CGI scripts take to run. If you don't want L, you don't want "less metaprotocol" like L, -you want "as little as possible" - which means "no metaprotocol", which is +you want "as little as possible" -- which means "no metaprotocol", which is what Moo provides. -By Moo 1.0 I intend to have Moo's equivalent of L built in - -if Moose gets loaded, any Moo class or role will act as a Moose equivalent -if treated as such. +Better still, if you install and load L, we set up metaclasses for your +L classes and L roles, so you can use them in L code +without ever noticing that some of your codebase is using L. -Hence - Moo exists as its name - Minimal Object Orientation - with a pledge +Hence, Moo exists as its name -- Minimal Object Orientation -- with a pledge to make it smooth to upgrade to L when you need more than minimal features. -=head1 Moo and Moose - NEW, EXPERIMENTAL +=head1 MOO AND MOOSE If L detects L being loaded, it will automatically register metaclasses for your L and L packages, so you should be able -to use them in L code without it ever realising you aren't using +to use them in L code without anybody ever noticing you aren't using L everywhere. -Extending a L class or consuming a L should also work. +Extending a L class or consuming a L will also work. -So should extending a L class or consuming a L. +So will extending a L class or consuming a L - but note +that we don't provide L metaclasses or metaroles so the other way +around doesn't work. This feature exists for L users porting to +L; enabling L users to use L classes is not a priority for us. This means that there is no need for anything like L for Moo code - Moo and Moose code should simply interoperate without problem. To handle L code, you'll likely need an empty Moo role or class consuming or extending the L stuff since it doesn't register true L -metaclasses like we do. +metaclasses like L does. -However, these features are new as of 0.91.0 (0.091000) so while serviceable, -they are absolutely certain to not be 100% yet; please do report bugs. +If you want types to be upgraded to the L types, use +L and install the L library to +match the L library you're using - L will +load the L library and use that type for the newly created +metaclass. If you need to disable the metaclass creation, add: no Moo::sification; to your code before Moose is loaded, but bear in mind that this switch is -currently global and turns the mechanism off entirely, so don't put this -in library code, only in a top level script as a temporary measure while -you send a bug report. +currently global and turns the mechanism off entirely so don't put this +in library code. + +=head1 MOO VERSUS ANY::MOOSE + +L will load L normally, and L in a program using +L - which theoretically allows you to get the startup time of L +without disadvantaging L users. + +Sadly, this doesn't entirely work, since the selection is load order dependent +- L's metaclass inflation system explained above in L is +significantly more reliable. + +So if you want to write a CPAN module that loads fast or has only pure perl +dependencies but is also fully usable by L users, you should be using +L. + +For a full explanation, see the article +L which explains +the differing strategies in more detail and provides a direct example of +where L succeeds and L fails. =head1 IMPORTED METHODS @@ -374,11 +438,11 @@ name of the attribute. =item * isa -Takes a coderef which is meant to validate the attribute. Unlike L Moo +Takes a coderef which is meant to validate the attribute. Unlike L, Moo does not include a basic type system, so instead of doing C<< isa => 'Num' >>, one should do - isa => quote_sub q{ + isa => sub { die "$_[0] is not a number!" unless looks_like_number $_[0] }, @@ -411,12 +475,12 @@ make L happy is fine. Takes a coderef which is meant to coerce the attribute. The basic idea is to do something like the following: - coerce => quote_sub q{ + coerce => sub { $_[0] + 1 unless $_[0] % 2 }, -Note that L will always fire your coercion - this is to permit -isa entries to be used purely for bug trapping, whereas coercions are +Note that L will always fire your coercion: this is to permit +C entries to be used purely for bug trapping, whereas coercions are always structural to your code. We do, however, apply any supplied C check after the coercion has run to ensure that it returned a valid value. @@ -456,7 +520,7 @@ supported. L -=item * default +=item * C Takes a coderef which will get called with $self as its only argument to populate an attribute if no value is supplied to the constructor - or @@ -469,7 +533,7 @@ existence. L -=item * predicate +=item * C Takes a method name which will return true if an attribute has a value. @@ -478,7 +542,7 @@ C if your attribute's name does not start with an underscore, or <_has_${attr_name_without_the_underscore}> if it does. This feature comes from L. -=item * builder +=item * C Takes a method name which will be called to create the attribute - functions exactly like default except that instead of calling @@ -492,7 +556,7 @@ Moo will call If you set this to just C<1>, the predicate is automatically named C<_build_${attr_name}>. This feature comes from L. -=item * clearer +=item * C Takes a method name which will clear the attribute. @@ -501,35 +565,35 @@ C if your attribute's name does not start with an underscore, or <_clear_${attr_name_without_the_underscore}> if it does. This feature comes from L. -=item * lazy +=item * C B. Set this if you want values for the attribute to be grabbed lazily. This is usually a good idea if you have a L which requires another attribute to be set. -=item * required +=item * C B. Set this if the attribute must be passed on instantiation. -=item * reader +=item * C The value of this attribute will be the name of the method to get the value of the attribute. If you like Java style methods, you might set this to C -=item * writer +=item * C The value of this attribute will be the name of the method to set the value of the attribute. If you like Java style methods, you might set this to -C +C. -=item * weak_ref +=item * C B. Set this if you want the reference that the attribute contains to be weakened; use this when circular references are possible, which will cause leaks. -=item * init_arg +=item * C Takes the name of the key to look for at instantiation time of the object. A common use of this is to make an underscored attribute have a non-underscored @@ -565,9 +629,43 @@ L allows us to create coderefs that are "inlineable," giving us a handy, XS-free speed boost. Any option that is L aware can take advantage of this. +To do this, you can write + + use Moo; + use Sub::Quote; + + has foo => ( + is => 'ro', + isa => quote_sub(q{ die "Not <3" unless $_[0] < 3 }) + ); + +which will be inlined as + + do { + local @_ = ($_[0]->{foo}); + die "Not <3" unless $_[0] < 3; + } + +or to avoid localizing @_, + + has foo => ( + is => 'ro', + isa => quote_sub(q{ my ($val) = @_; die "Not <3" unless $val < 3 }) + ); + +which will be inlined as + + do { + my ($val) = ($_[0]->{foo}); + die "Not <3" unless $val < 3; + } + +See L for more information, including how to pass lexical +captures that will also be compiled into the subroutine. + =head1 INCOMPATIBILITIES WITH MOOSE -There is no built in type system. C is verified with a coderef, if you +There is no built-in type system. C is verified with a coderef; if you need complex types, just make a library of coderefs, or better yet, functions that return quoted subs. L provides a similar API to L so that you can write @@ -614,7 +712,7 @@ L only supports coderefs, because doing otherwise is usually a mistake anyway. C is not supported; you are instead encouraged to use the -C 'lazy'> option supported by L and L. +C<< is => 'lazy' >> option supported by L and L. C is not supported since the author considers it a bad idea. @@ -623,7 +721,7 @@ but is otherwise ignored. Then again, L ignores it as well, so this is arguably not an incompatibility. Since C does not require C to be defined but L does -require it, the metaclass inflation for coerce-alone is a trifle insane +require it, the metaclass inflation for coerce alone is a trifle insane and if you attempt to subtype the result will almost certainly break. Handling of warnings: when you C we enable FATAL warnings. The nearest @@ -666,7 +764,9 @@ on your class. =head1 SUPPORT -IRC: #web-simple on irc.perl.org +Users' IRC: #moose on irc.perl.org + +Development and contribution IRC: #web-simple on irc.perl.org =head1 AUTHOR @@ -692,6 +792,12 @@ doy - Jesse Luehrs (cpan:DOY) perigrin - Chris Prather (cpan:PERIGRIN) +Mithaldu - Christian Walde (cpan:MITHALDU) + +ilmari - Dagfinn Ilmari Mannsåker (cpan:ILMARI) + +tobyink - Toby Inkster (cpan:TOBYINK) + =head1 COPYRIGHT Copyright (c) 2010-2011 the Moo L and L