package Mouse::PurePerl; require Mouse::Util; package Mouse::Util; use strict; use warnings; use warnings FATAL => 'redefine'; # to avoid to load Mouse::PurePerl use B (); sub is_class_loaded { my $class = shift; return 0 if ref($class) || !defined($class) || !length($class); # walk the symbol table tree to avoid autovififying # \*{${main::}{"Foo::"}{"Bar::"}} == \*main::Foo::Bar:: my $pack = \%::; foreach my $part (split('::', $class)) { $part .= '::'; return 0 if !exists $pack->{$part}; my $entry = \$pack->{$part}; return 0 if ref($entry) ne 'GLOB'; $pack = *{$entry}{HASH}; } return 0 if !%{$pack}; # check for $VERSION or @ISA return 1 if exists $pack->{VERSION} && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; return 1 if exists $pack->{ISA} && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; # check for any method foreach my $name( keys %{$pack} ) { my $entry = \$pack->{$name}; return 1 if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; } # fail return 0; } # taken from Sub::Identify sub get_code_info { my ($coderef) = @_; ref($coderef) or return; my $cv = B::svref_2object($coderef); $cv->isa('B::CV') or return; my $gv = $cv->GV; $gv->isa('B::GV') or return; return ($gv->STASH->NAME, $gv->NAME); } sub get_code_package{ my($coderef) = @_; my $cv = B::svref_2object($coderef); $cv->isa('B::CV') or return ''; my $gv = $cv->GV; $gv->isa('B::GV') or return ''; return $gv->STASH->NAME; } sub get_code_ref{ my($package, $name) = @_; no strict 'refs'; no warnings 'once'; use warnings FATAL => 'uninitialized'; return *{$package . '::' . $name}{CODE}; } sub generate_isa_predicate_for { my($for_class, $name) = @_; my $predicate = sub{ Scalar::Util::blessed($_[0]) && $_[0]->isa($for_class) }; if(defined $name){ no strict 'refs'; *{ caller() . '::' . $name } = $predicate; return; } return $predicate; } sub generate_can_predicate_for { my($methods_ref, $name) = @_; my @methods = @{$methods_ref}; my $predicate = sub{ my($instance) = @_; if(Scalar::Util::blessed($instance)){ foreach my $method(@methods){ if(!$instance->can($method)){ return 0; } } return 1; } return 0; }; if(defined $name){ no strict 'refs'; *{ caller() . '::' . $name } = $predicate; return; } return $predicate; } package Mouse::Util::TypeConstraints; use Scalar::Util qw(blessed looks_like_number openhandle); sub Any { 1 } sub Item { 1 } sub Bool { $_[0] ? $_[0] eq '1' : 1 } sub Undef { !defined($_[0]) } sub Defined { defined($_[0]) } sub Value { defined($_[0]) && !ref($_[0]) } sub Num { !ref($_[0]) && looks_like_number($_[0]) } sub Int { defined($_[0]) && !ref($_[0]) && $_[0] =~ /^-?[0-9]+$/ } sub Str { my($value) = @_; return defined($value) && ref(\$value) eq 'SCALAR'; } sub Ref { ref($_[0]) } sub ScalarRef { my($value) = @_; return ref($value) eq 'SCALAR' } sub ArrayRef { ref($_[0]) eq 'ARRAY' } sub HashRef { ref($_[0]) eq 'HASH' } sub CodeRef { ref($_[0]) eq 'CODE' } sub RegexpRef { ref($_[0]) eq 'Regexp' } sub GlobRef { ref($_[0]) eq 'GLOB' } sub FileHandle { return openhandle($_[0]) || (blessed($_[0]) && $_[0]->isa("IO::Handle")) } sub Object { blessed($_[0]) && blessed($_[0]) ne 'Regexp' } sub ClassName { Mouse::Util::is_class_loaded($_[0]) } sub RoleName { (Mouse::Util::class_of($_[0]) || return 0)->isa('Mouse::Meta::Role') } sub _parameterize_ArrayRef_for { my($type_parameter) = @_; my $check = $type_parameter->_compiled_type_constraint; return sub { foreach my $value (@{$_}) { return undef unless $check->($value); } return 1; } } sub _parameterize_HashRef_for { my($type_parameter) = @_; my $check = $type_parameter->_compiled_type_constraint; return sub { foreach my $value(values %{$_}){ return undef unless $check->($value); } return 1; }; } # 'Maybe' type accepts 'Any', so it requires parameters sub _parameterize_Maybe_for { my($type_parameter) = @_; my $check = $type_parameter->_compiled_type_constraint; return sub{ return !defined($_) || $check->($_); }; }; package Mouse::Meta::Module; sub name { $_[0]->{package} } sub _method_map { $_[0]->{methods} } sub _attribute_map{ $_[0]->{attributes} } sub namespace{ my $name = $_[0]->{package}; no strict 'refs'; return \%{ $name . '::' }; } sub add_method { my($self, $name, $code) = @_; if(!defined $name){ $self->throw_error('You must pass a defined name'); } if(!defined $code){ $self->throw_error('You must pass a defined code'); } if(ref($code) ne 'CODE'){ $code = \&{$code}; # coerce } $self->{methods}->{$name} = $code; # Moose stores meta object here. my $pkg = $self->name; no strict 'refs'; no warnings 'redefine', 'once'; *{ $pkg . '::' . $name } = $code; return; } package Mouse::Meta::Class; sub method_metaclass { $_[0]->{method_metaclass} || 'Mouse::Meta::Method' } sub attribute_metaclass { $_[0]->{attribute_metaclass} || 'Mouse::Meta::Attribute' } sub constructor_class { $_[0]->{constructor_class} || 'Mouse::Meta::Method::Constructor' } sub destructor_class { $_[0]->{destructor_class} || 'Mouse::Meta::Method::Destructor' } sub is_anon_class{ return exists $_[0]->{anon_serial_id}; } sub roles { $_[0]->{roles} } sub linearized_isa { @{ get_linear_isa($_[0]->{package}) } } sub get_all_attributes { my($self) = @_; my %attrs = map { %{ $self->initialize($_)->{attributes} } } reverse $self->linearized_isa; return values %attrs; } sub new_object { my $self = shift; my %args = (@_ == 1 ? %{$_[0]} : @_); my $object = bless {}, $self->name; $self->_initialize_object($object, \%args); return $object; } sub _initialize_object{ my($self, $object, $args, $ignore_triggers) = @_; my @triggers_queue; foreach my $attribute ($self->get_all_attributes) { my $init_arg = $attribute->init_arg; my $slot = $attribute->name; if (defined($init_arg) && exists($args->{$init_arg})) { $object->{$slot} = $attribute->_coerce_and_verify($args->{$init_arg}, $object); weaken($object->{$slot}) if ref($object->{$slot}) && $attribute->is_weak_ref; if ($attribute->has_trigger) { push @triggers_queue, [ $attribute->trigger, $object->{$slot} ]; } } else { # no init arg if ($attribute->has_default || $attribute->has_builder) { if (!$attribute->is_lazy) { my $default = $attribute->default; my $builder = $attribute->builder; my $value = $builder ? $object->$builder() : ref($default) eq 'CODE' ? $object->$default() : $default; $object->{$slot} = $attribute->_coerce_and_verify($value, $object); weaken($object->{$slot}) if ref($object->{$slot}) && $attribute->is_weak_ref; } } elsif($attribute->is_required) { $self->throw_error("Attribute (".$attribute->name.") is required"); } } } if(!$ignore_triggers){ foreach my $trigger_and_value(@triggers_queue){ my($trigger, $value) = @{$trigger_and_value}; $trigger->($object, $value); } } if($self->is_anon_class){ $object->{__METACLASS__} = $self; } return; } sub is_immutable { $_[0]->{is_immutable} } package Mouse::Meta::Role; sub method_metaclass{ $_[0]->{method_metaclass} || 'Mouse::Meta::Role::Method' } sub is_anon_role{ return exists $_[0]->{anon_serial_id}; } sub get_roles { $_[0]->{roles} } package Mouse::Meta::Attribute; require Mouse::Meta::Method::Accessor; sub accessor_metaclass{ $_[0]->{accessor_metaclass} || 'Mouse::Meta::Method::Accessor' } # readers sub name { $_[0]->{name} } sub associated_class { $_[0]->{associated_class} } sub accessor { $_[0]->{accessor} } sub reader { $_[0]->{reader} } sub writer { $_[0]->{writer} } sub predicate { $_[0]->{predicate} } sub clearer { $_[0]->{clearer} } sub handles { $_[0]->{handles} } sub _is_metadata { $_[0]->{is} } sub is_required { $_[0]->{required} } sub default { $_[0]->{default} } sub is_lazy { $_[0]->{lazy} } sub is_lazy_build { $_[0]->{lazy_build} } sub is_weak_ref { $_[0]->{weak_ref} } sub init_arg { $_[0]->{init_arg} } sub type_constraint { $_[0]->{type_constraint} } sub trigger { $_[0]->{trigger} } sub builder { $_[0]->{builder} } sub should_auto_deref { $_[0]->{auto_deref} } sub should_coerce { $_[0]->{coerce} } sub documentation { $_[0]->{documentation} } # predicates sub has_accessor { exists $_[0]->{accessor} } sub has_reader { exists $_[0]->{reader} } sub has_writer { exists $_[0]->{writer} } sub has_predicate { exists $_[0]->{predicate} } sub has_clearer { exists $_[0]->{clearer} } sub has_handles { exists $_[0]->{handles} } sub has_default { exists $_[0]->{default} } sub has_type_constraint { exists $_[0]->{type_constraint} } sub has_trigger { exists $_[0]->{trigger} } sub has_builder { exists $_[0]->{builder} } sub has_documentation { exists $_[0]->{documentation} } sub _process_options{ my($class, $name, $args) = @_; # taken from Class::MOP::Attribute::new defined($name) or $class->throw_error('You must provide a name for the attribute'); if(!exists $args->{init_arg}){ $args->{init_arg} = $name; } # 'required' requires eigher 'init_arg', 'builder', or 'default' my $can_be_required = defined( $args->{init_arg} ); if(exists $args->{builder}){ # XXX: # Moose refuses a CODE ref builder, but Mouse doesn't for backward compatibility # This feature will be changed in a future. (gfx) $class->throw_error('builder must be a defined scalar value which is a method name') #if ref $args->{builder} || !defined $args->{builder}; if !defined $args->{builder}; $can_be_required++; } elsif(exists $args->{default}){ if(ref $args->{default} && ref($args->{default}) ne 'CODE'){ $class->throw_error("References are not allowed as default values, you must " . "wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])"); } $can_be_required++; } if( $args->{required} && !$can_be_required ) { $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg"); } # taken from Mouse::Meta::Attribute->new and ->_process_args if(exists $args->{is}){ my $is = $args->{is}; if($is eq 'ro'){ $args->{reader} ||= $name; } elsif($is eq 'rw'){ if(exists $args->{writer}){ $args->{reader} ||= $name; } else{ $args->{accessor} ||= $name; } } elsif($is eq 'bare'){ # do nothing, but don't complain (later) about missing methods } else{ $is = 'undef' if !defined $is; $class->throw_error("I do not understand this option (is => $is) on attribute ($name)"); } } my $tc; if(exists $args->{isa}){ $args->{type_constraint} = Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($args->{isa}); } elsif(exists $args->{does}){ $args->{type_constraint} = Mouse::Util::TypeConstraints::find_or_create_does_type_constraint($args->{does}); } $tc = $args->{type_constraint}; if($args->{coerce}){ defined($tc) || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)"); $args->{weak_ref} && $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)"); } if ($args->{lazy_build}) { exists($args->{default}) && $class->throw_error("You can not use lazy_build and default for the same attribute ($name)"); $args->{lazy} = 1; $args->{builder} ||= "_build_${name}"; if ($name =~ /^_/) { $args->{clearer} ||= "_clear${name}"; $args->{predicate} ||= "_has${name}"; } else { $args->{clearer} ||= "clear_${name}"; $args->{predicate} ||= "has_${name}"; } } if ($args->{auto_deref}) { defined($tc) || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)"); ( $tc->is_a_type_of('ArrayRef') || $tc->is_a_type_of('HashRef') ) || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)"); } if (exists $args->{trigger}) { ('CODE' eq ref $args->{trigger}) || $class->throw_error("Trigger must be a CODE ref on attribute ($name)"); } if ($args->{lazy}) { (exists $args->{default} || defined $args->{builder}) || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it"); } return; } package Mouse::Meta::TypeConstraint; sub name { $_[0]->{name} } sub parent { $_[0]->{parent} } sub message { $_[0]->{message} } sub _compiled_type_constraint{ $_[0]->{compiled_type_constraint} } sub _compiled_type_coercion { $_[0]->{_compiled_type_coercion} } sub has_coercion{ exists $_[0]->{_compiled_type_coercion} } sub compile_type_constraint{ my($self) = @_; # add parents first my @checks; for(my $parent = $self->{parent}; defined $parent; $parent = $parent->{parent}){ if($parent->{hand_optimized_type_constraint}){ unshift @checks, $parent->{hand_optimized_type_constraint}; last; # a hand optimized constraint must include all the parents } elsif($parent->{constraint}){ unshift @checks, $parent->{constraint}; } } # then add child if($self->{constraint}){ push @checks, $self->{constraint}; } if($self->{type_constraints}){ # Union my @types = map{ $_->{compiled_type_constraint} } @{ $self->{type_constraints} }; push @checks, sub{ foreach my $c(@types){ return 1 if $c->($_[0]); } return 0; }; } if(@checks == 0){ $self->{compiled_type_constraint} = \&Mouse::Util::TypeConstraints::Any; } else{ $self->{compiled_type_constraint} = sub{ my(@args) = @_; local $_ = $args[0]; foreach my $c(@checks){ return undef if !$c->(@args); } return 1; }; } return; } package Mouse::Object; sub BUILDARGS { my $class = shift; if (scalar @_ == 1) { (ref($_[0]) eq 'HASH') || $class->meta->throw_error("Single parameters to new() must be a HASH ref"); return {%{$_[0]}}; } else { return {@_}; } } sub new { my $class = shift; $class->meta->throw_error('Cannot call new() on an instance') if ref $class; my $args = $class->BUILDARGS(@_); my $meta = Mouse::Meta::Class->initialize($class); my $self = $meta->new_object($args); # BUILDALL if( $self->can('BUILD') ) { for my $class (reverse $meta->linearized_isa) { my $build = Mouse::Util::get_code_ref($class, 'BUILD') || next; $self->$build($args); } } return $self; } sub DESTROY { my $self = shift; return unless $self->can('DEMOLISH'); # short circuit local $?; my $e = do{ local $@; eval{ # DEMOLISHALL # We cannot count on being able to retrieve a previously made # metaclass, _or_ being able to make a new one during global # destruction. However, we should still be able to use mro at # that time (at least tests suggest so ;) foreach my $class (@{ Mouse::Util::get_linear_isa(ref $self) }) { my $demolish = Mouse::Util::get_code_ref($class, 'DEMOLISH') || next; $self->$demolish($Mouse::Util::in_global_destruction); } }; $@; }; no warnings 'misc'; die $e if $e; # rethrow } sub BUILDALL { my $self = shift; # short circuit return unless $self->can('BUILD'); for my $class (reverse $self->meta->linearized_isa) { my $build = Mouse::Util::get_code_ref($class, 'BUILD') || next; $self->$build(@_); } return; } sub DEMOLISHALL; *DEMOLISHALL = \&DESTROY; 1; __END__ =head1 NAME Mouse::PurePerl - A Mouse guts in pure Perl =head1 VERSION This document describes Mouse version 0.50_01 =head1 SEE ALSO L =cut