X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FAttribute.pm;h=3e4bf749fc88f1a5fc6795b3f689883bfe831fdb;hb=9fa3924018dc60275270bca32a5f1357d61167e0;hp=cb75d30eb85dacbe263c66071a187b906b1c1652;hpb=4c9e047861c287e6ea954f6ff6e68a50339b376c;p=gitmo%2FMoose.git diff --git a/lib/Moose/Meta/Attribute.pm b/lib/Moose/Meta/Attribute.pm index cb75d30..3e4bf74 100644 --- a/lib/Moose/Meta/Attribute.pm +++ b/lib/Moose/Meta/Attribute.pm @@ -5,13 +5,13 @@ use strict; use warnings; use Scalar::Util 'blessed', 'weaken'; -use Carp 'confess'; use overload (); -our $VERSION = '0.55'; +our $VERSION = '0.60'; our $AUTHORITY = 'cpan:STEVAN'; use Moose::Meta::Method::Accessor; +use Moose::Meta::Method::Delegation; use Moose::Util (); use Moose::Util::TypeConstraints (); @@ -61,7 +61,17 @@ sub does { Moose::Util::resolve_metatrait_alias(Attribute => $role_name) }; return 0 if !defined($name); # failed to load class - return Moose::Object::does($self, $name); + return $self->Moose::Object::does($name); +} + +sub throw_error { + my $self = shift; + my $class = ( ref $self && $self->associated_class ) || "Moose::Meta::Class"; + unshift @_, "message" if @_ % 2 == 1; + unshift @_, attr => $self if ref $self; + unshift @_, $class; + my $handler = $class->can("throw_error"); # to avoid incrementing depth by 1 + goto $handler; } sub new { @@ -173,7 +183,7 @@ sub clone_and_inherit_options { else { $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa}); (defined $type_constraint) - || confess "Could not find the type constraint '" . $options{isa} . "'"; + || $self->throw_error("Could not find the type constraint '" . $options{isa} . "'", data => $options{isa}); } $actual_options{type_constraint} = $type_constraint; @@ -188,7 +198,7 @@ sub clone_and_inherit_options { else { $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does}); (defined $type_constraint) - || confess "Could not find the type constraint '" . $options{does} . "'"; + || $self->throw_error("Could not find the type constraint '" . $options{does} . "'", data => $options{does}); } $actual_options{type_constraint} = $type_constraint; @@ -210,7 +220,7 @@ sub clone_and_inherit_options { } (scalar keys %options == 0) - || confess "Illegal inherited options => (" . (join ', ' => keys %options) . ")"; + || $self->throw_error("Illegal inherited options => (" . (join ', ' => keys %options) . ")", data => \%options); $self->clone(%actual_options); @@ -258,7 +268,7 @@ sub _process_options { ### ------------------------- if ($options->{is} eq 'ro') { - confess "Cannot define an accessor name on a read-only attribute, accessors are read/write" + $class->throw_error("Cannot define an accessor name on a read-only attribute, accessors are read/write", data => $options) if exists $options->{accessor}; $options->{reader} ||= $name; } @@ -271,7 +281,7 @@ sub _process_options { } } else { - confess "I do not understand this option (is => " . $options->{is} . ") on attribute ($name)" + $class->throw_error("I do not understand this option (is => " . $options->{is} . ") on attribute ($name)", data => $options->{is}); } } @@ -279,10 +289,10 @@ sub _process_options { if (exists $options->{does}) { if (eval { $options->{isa}->can('does') }) { ($options->{isa}->does($options->{does})) - || confess "Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)"; + || $class->throw_error("Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)", data => $options); } else { - confess "Cannot have an isa option which cannot ->does() on attribute ($name)"; + $class->throw_error("Cannot have an isa option which cannot ->does() on attribute ($name)", data => $options); } } @@ -306,26 +316,26 @@ sub _process_options { if (exists $options->{coerce} && $options->{coerce}) { (exists $options->{type_constraint}) - || confess "You cannot have coercion without specifying a type constraint on attribute ($name)"; - confess "You cannot have a weak reference to a coerced value on attribute ($name)" + || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)", data => $options); + $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)", data => $options) if $options->{weak_ref}; } if (exists $options->{trigger}) { ('CODE' eq ref $options->{trigger}) - || confess "Trigger must be a CODE ref on attribute ($name)"; + || $class->throw_error("Trigger must be a CODE ref on attribute ($name)", data => $options->{trigger}); } if (exists $options->{auto_deref} && $options->{auto_deref}) { (exists $options->{type_constraint}) - || confess "You cannot auto-dereference without specifying a type constraint on attribute ($name)"; + || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)", data => $options); ($options->{type_constraint}->is_a_type_of('ArrayRef') || $options->{type_constraint}->is_a_type_of('HashRef')) - || confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)"; + || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)", data => $options); } if (exists $options->{lazy_build} && $options->{lazy_build} == 1) { - confess("You can not use lazy_build and default for the same attribute ($name)") + $class->throw_error("You can not use lazy_build and default for the same attribute ($name)", data => $options) if exists $options->{default}; $options->{lazy} = 1; $options->{required} = 1; @@ -342,11 +352,11 @@ sub _process_options { if (exists $options->{lazy} && $options->{lazy}) { (exists $options->{default} || defined $options->{builder} ) - || confess "You cannot have lazy attribute ($name) without specifying a default value for it"; + || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it", data => $options); } if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) { - confess "You cannot have a required attribute ($name) without a default, builder, or an init_arg"; + $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg", data => $options); } } @@ -366,7 +376,7 @@ sub initialize_instance_slot { # skip it if it's lazy return if $self->is_lazy; # and die if it's required and doesn't have a default value - confess "Attribute (" . $self->name . ") is required" + $self->throw_error("Attribute (" . $self->name . ") is required", object => $instance, data => $params) if $self->is_required && !$self->has_default && !$self->has_builder; # if nothing was in the %params, we can use the @@ -376,13 +386,8 @@ sub initialize_instance_slot { $value_is_set = 1; } elsif ($self->has_builder) { - if (my $builder = $instance->can($self->builder)){ - $val = $instance->$builder; - $value_is_set = 1; - } - else { - confess(blessed($instance)." does not support builder method '".$self->builder."' for attribute '" . $self->name . "'"); - } + $val = $self->_call_builder($instance); + $value_is_set = 1; } } @@ -394,10 +399,10 @@ sub initialize_instance_slot { $val = $type_constraint->coerce($val); } $type_constraint->check($val) - || confess "Attribute (" + || $self->throw_error("Attribute (" . $self->name . ") does not pass the type constraint because: " - . $type_constraint->get_message($val); + . $type_constraint->get_message($val), data => $val, object => $instance); } $self->set_initial_value($instance, $val); @@ -405,6 +410,24 @@ sub initialize_instance_slot { if ref $val && $self->is_weak_ref; } +sub _call_builder { + my ( $self, $instance ) = @_; + + my $builder = $self->builder(); + + return $instance->$builder() + if $instance->can( $self->builder ); + + $self->throw_error( blessed($instance) + . " does not support builder method '" + . $self->builder + . "' for attribute '" + . $self->name + . "'", + object => $instance, + ); +} + ## Slot management # FIXME: @@ -432,10 +455,10 @@ sub _set_initial_slot_value { $val = $type_constraint->coerce($val) if $can_coerce; $type_constraint->check($val) - || confess "Attribute (" + || $self->throw_error("Attribute (" . $slot_name . ") does not pass the type constraint because: " - . $type_constraint->get_message($val); + . $type_constraint->get_message($val), data => $val, object => $instance); } $meta_instance->set_slot_value($instance, $slot_name, $val); }; @@ -453,7 +476,7 @@ sub set_value { my $attr_name = $self->name; if ($self->is_required and not @args) { - confess "Attribute ($attr_name) is required"; + $self->throw_error("Attribute ($attr_name) is required", object => $instance); } if ($self->has_type_constraint) { @@ -464,10 +487,10 @@ sub set_value { $value = $type_constraint->coerce($value); } $type_constraint->_compiled_type_constraint->($value) - || confess "Attribute (" + || $self->throw_error("Attribute (" . $self->name . ") does not pass the type constraint because " - . $type_constraint->get_message($value); + . $type_constraint->get_message($value), object => $instance, data => $value); } my $meta_instance = Class::MOP::Class->initialize(blessed($instance)) @@ -489,25 +512,22 @@ sub get_value { if ($self->is_lazy) { unless ($self->has_value($instance)) { + my $value; if ($self->has_default) { - my $default = $self->default($instance); - $self->set_initial_value($instance, $default); + $value = $self->default($instance); } elsif ( $self->has_builder ) { - if (my $builder = $instance->can($self->builder)){ - $self->set_initial_value($instance, $instance->$builder); - } - else { - confess(blessed($instance) - . " does not support builder method '" - . $self->builder - . "' for attribute '" - . $self->name - . "'"); - } - } - else { - $self->set_initial_value($instance, undef); + $value = $self->_call_builder($instance); + } + if ($self->has_type_constraint) { + my $type_constraint = $self->type_constraint; + $value = $type_constraint->coerce($value) + if ($self->should_coerce); + $type_constraint->check($value) + || $self->throw_error("Attribute (" . $self->name + . ") does not pass the type constraint because: " + . $type_constraint->get_message($value), type_constraint => $type_constraint, data => $value); } + $self->set_initial_value($instance, $value); } } @@ -526,7 +546,7 @@ sub get_value { return wantarray ? %{ $rv } : $rv; } else { - confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'"; + $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", object => $instance, type_constraint => $type_constraint); } } @@ -557,8 +577,6 @@ sub install_delegation { # to delagate to, see that method for details my %handles = $self->_canonicalize_handles; - # find the accessor method for this attribute - my $accessor = $self->_get_delegate_accessor; # install the delegation ... my $associated_class = $self->associated_class; @@ -567,8 +585,8 @@ sub install_delegation { my $class_name = $associated_class->name; my $name = "${class_name}::${handle}"; - (!$associated_class->has_method($handle)) - || confess "You cannot overwrite a locally defined method ($handle) with a delegation"; + (!$associated_class->has_method($handle)) + || $self->throw_error("You cannot overwrite a locally defined method ($handle) with a delegation", method_name => $handle); # NOTE: # handles is not allowed to delegate @@ -580,43 +598,14 @@ sub install_delegation { #cluck("Not delegating method '$handle' because it is a core method") and next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle); - if ('CODE' eq ref($method_to_call)) { - $associated_class->add_method($handle => Class::MOP::subname($name, $method_to_call)); - } - else { - # NOTE: - # we used to do a goto here, but the - # goto didn't handle failure correctly - # (it just returned nothing), so I took - # that out. However, the more I thought - # about it, the less I liked it doing - # the goto, and I prefered the act of - # delegation being actually represented - # in the stack trace. - # - SL - $associated_class->add_method($handle => Class::MOP::subname($name, sub { - my $proxy = (shift)->$accessor(); - (defined $proxy) - || confess "Cannot delegate $handle to $method_to_call because " . - "the value of " . $self->name . " is not defined"; - $proxy->$method_to_call(@_); - })); - } + my $method = $self->_make_delegation_method($handle, $method_to_call); + + $self->associated_class->add_method($method->name, $method); } } # private methods to help delegation ... -sub _get_delegate_accessor { - my $self = shift; - # find the accessor method for this attribute - my $accessor = $self->get_read_method_ref; - # then unpack it if we need too ... - $accessor = $accessor->body if blessed $accessor; - # return the accessor - return $accessor; -} - sub _canonicalize_handles { my $self = shift; my $handles = $self->handles; @@ -629,7 +618,7 @@ sub _canonicalize_handles { } elsif ($handle_type eq 'Regexp') { ($self->has_type_constraint) - || confess "Cannot delegate methods based on a RegExpr without a type constraint (isa)"; + || $self->throw_error("Cannot delegate methods based on a RegExpr without a type constraint (isa)", data => $handles); return map { ($_ => $_) } grep { /$handles/ } $self->_get_delegate_method_list; } @@ -637,18 +626,21 @@ sub _canonicalize_handles { return $handles->($self, $self->_find_delegate_metaclass); } else { - confess "Unable to canonicalize the 'handles' option with $handles"; + $self->throw_error("Unable to canonicalize the 'handles' option with $handles", data => $handles); } } else { + Class::MOP::load_class($handles) + unless Class::MOP::is_class_loaded($handles); + my $role_meta = eval { $handles->meta }; if ($@) { - confess "Unable to canonicalize the 'handles' option with $handles because : $@"; + $self->throw_error("Unable to canonicalize the 'handles' option with $handles because : $@", data => $handles, error => $@); } (blessed $role_meta && $role_meta->isa('Moose::Meta::Role')) - || confess "Unable to canonicalize the 'handles' option with $handles because ->meta is not a Moose::Meta::Role"; - + || $self->throw_error("Unable to canonicalize the 'handles' option with $handles because ->meta is not a Moose::Meta::Role", data => $handles); + return map { $_ => $_ } ( $role_meta->get_method_list, $role_meta->get_required_method_list @@ -674,7 +666,7 @@ sub _find_delegate_metaclass { return $role->meta; } else { - confess "Cannot find delegate metaclass for attribute " . $self->name; + $self->throw_error("Cannot find delegate metaclass for attribute " . $self->name); } } @@ -682,18 +674,34 @@ sub _get_delegate_method_list { my $self = shift; my $meta = $self->_find_delegate_metaclass; if ($meta->isa('Class::MOP::Class')) { - return map { $_->{name} } # NOTE: !never! delegate &meta - grep { $_->{class} ne 'Moose::Object' && $_->{name} ne 'meta' } - $meta->compute_all_applicable_methods; + return map { $_->name } # NOTE: !never! delegate &meta + grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' } + $meta->get_all_methods; } elsif ($meta->isa('Moose::Meta::Role')) { return $meta->get_method_list; } else { - confess "Unable to recognize the delegate metaclass '$meta'"; + $self->throw_error("Unable to recognize the delegate metaclass '$meta'", data => $meta); } } +sub _make_delegation_method { + my ( $self, $handle_name, $method_to_call ) = @_; + + my $method_body; + + $method_body = $method_to_call + if 'CODE' eq ref($method_to_call); + + return Moose::Meta::Method::Delegation->new( + name => $handle_name, + package_name => $self->associated_class->name, + attribute => $self, + delegate_to_method => $method_to_call, + ); +} + package Moose::Meta::Attribute::Custom::Moose; sub register_implementation { 'Moose::Meta::Attribute' } @@ -754,14 +762,14 @@ I Before setting the value, a check is made on the type constraint of the attribute, if it has one, to see if the value passes it. If the -value fails to pass, the set operation dies with a L. +value fails to pass, the set operation dies with a L. Any coercion to convert values is done before checking the type constraint. To check a value against a type constraint before setting it, fetch the attribute instance using L, fetch the type_constraint from the attribute using L -and call L. See L +and call L. See L for an example. =back @@ -773,6 +781,10 @@ creation and type coercion. =over 4 +=item B + +Delegates to C or C if there is none. + =item B =item B