package Moose::Meta::Method::Accessor;
use strict;
use warnings;
our $VERSION = '1.00';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::Method',
'Class::MOP::Method::Accessor';
sub _error_thrower {
my $self = shift;
( ref $self && $self->associated_attribute ) || $self->SUPER::_error_thrower();
}
sub _eval_code {
my ( $self, $source ) = @_;
# NOTE:
# set up the environment
my $attr = $self->associated_attribute;
my $type_constraint_obj = $attr->type_constraint;
my $environment = {
'$attr' => \$attr,
'$meta' => \$self,
'$type_constraint_obj' => \$type_constraint_obj,
'$type_constraint' => \($type_constraint_obj
? $type_constraint_obj->_compiled_type_constraint
: undef),
};
#warn "code for " . $attr->name . " =>\n" . $source . "\n";
my ( $code, $e ) = $self->_compile_code( environment => $environment, code => $source );
$self->throw_error(
"Could not create writer for '${\$self->associated_attribute->name}' because $e \n code: $source",
error => $e, data => $source )
if $e;
return $code;
}
sub _generate_accessor_method_inline {
my $self = $_[0];
my $attr = $self->associated_attribute;
my $inv = '$_[0]';
my $value_name = $self->_value_needs_copy ? '$val' : '$_[1]';
$self->_eval_code('sub { ' . "\n"
. $self->_inline_pre_body(@_) . "\n"
. 'if (scalar(@_) >= 2) {' . "\n"
. $self->_inline_copy_value . "\n"
. $self->_inline_check_required . "\n"
. $self->_inline_check_coercion($value_name) . "\n"
. $self->_inline_check_constraint($value_name) . "\n"
. $self->_inline_get_old_value_for_trigger($inv, $value_name) . "\n"
. $self->_inline_store($inv, $value_name) . "\n"
. $self->_inline_trigger($inv, $value_name, '@old') . "\n"
. ' }' . "\n"
. $self->_inline_check_lazy($inv) . "\n"
. $self->_inline_post_body(@_) . "\n"
. 'return ' . $self->_inline_auto_deref($self->_inline_get($inv)) . "\n"
. ' }');
}
sub _generate_writer_method_inline {
my $self = $_[0];
my $attr = $self->associated_attribute;
my $inv = '$_[0]';
my $slot_access = $self->_inline_get($inv);
my $value_name = $self->_value_needs_copy ? '$val' : '$_[1]';
$self->_eval_code('sub { '
. $self->_inline_pre_body(@_)
. $self->_inline_copy_value
. $self->_inline_check_required
. $self->_inline_check_coercion($value_name)
. $self->_inline_check_constraint($value_name)
. $self->_inline_get_old_value_for_trigger($inv, $value_name) . "\n"
. $self->_inline_store($inv, $value_name)
. $self->_inline_post_body(@_)
. $self->_inline_trigger($inv, $value_name, '@old')
. ' }');
}
sub _generate_reader_method_inline {
my $self = $_[0];
my $attr = $self->associated_attribute;
my $inv = '$_[0]';
my $slot_access = $self->_inline_get($inv);
$self->_eval_code('sub {'
. $self->_inline_pre_body(@_)
. $self->_inline_throw_error('"Cannot assign a value to a read-only accessor"', 'data => \@_') . ' if @_ > 1;'
. $self->_inline_check_lazy($inv)
. $self->_inline_post_body(@_)
. 'return ' . $self->_inline_auto_deref( $slot_access ) . ';'
. '}');
}
sub _inline_copy_value {
return '' unless shift->_value_needs_copy;
return 'my $val = $_[1];'
}
sub _value_needs_copy {
my $attr = (shift)->associated_attribute;
return $attr->should_coerce;
}
sub _generate_reader_method { shift->_generate_reader_method_inline(@_) }
sub _generate_writer_method { shift->_generate_writer_method_inline(@_) }
sub _generate_accessor_method { shift->_generate_accessor_method_inline(@_) }
sub _generate_predicate_method { shift->_generate_predicate_method_inline(@_) }
sub _generate_clearer_method { shift->_generate_clearer_method_inline(@_) }
sub _inline_pre_body { '' }
sub _inline_post_body { '' }
sub _inline_check_constraint {
my ($self, $value) = @_;
my $attr = $self->associated_attribute;
return '' unless $attr->has_type_constraint;
my $attr_name = quotemeta( $attr->name );
qq{\$type_constraint->($value) || } . $self->_inline_throw_error(qq{"Attribute ($attr_name) does not pass the type constraint because: " . \$type_constraint_obj->get_message($value)}, "data => $value") . ";";
}
sub _inline_check_coercion {
my ($self, $value) = @_;
my $attr = $self->associated_attribute;
return '' unless $attr->should_coerce;
return "$value = \$attr->type_constraint->coerce($value);";
}
sub _inline_check_required {
my $self = shift;
my $attr = $self->associated_attribute;
return '' unless $attr->is_required;
my $attr_name = quotemeta( $attr->name );
return qq{(\@_ >= 2) || } . $self->_inline_throw_error(qq{"Attribute ($attr_name) is required, so cannot be set to undef"}) . ';' # defined $_[1] is not good enough
}
sub _inline_check_lazy {
my ($self, $instance) = @_;
my $attr = $self->associated_attribute;
return '' unless $attr->is_lazy;
my $slot_exists = $self->_inline_has($instance);
my $code = 'unless (' . $slot_exists . ') {' . "\n";
if ($attr->has_type_constraint) {
if ($attr->has_default || $attr->has_builder) {
if ($attr->has_default) {
$code .= ' my $default = $attr->default(' . $instance . ');'."\n";
}
elsif ($attr->has_builder) {
$code .= ' my $default;'."\n".
' if(my $builder = '.$instance.'->can($attr->builder)){ '."\n".
' $default = '.$instance.'->$builder; '. "\n } else {\n" .
' ' . $self->_inline_throw_error(q{sprintf "%s does not support builder method '%s' for attribute '%s'", ref(} . $instance . ') || '.$instance.', $attr->builder, $attr->name') .
';'. "\n }";
}
$code .= $self->_inline_check_coercion('$default') . "\n";
$code .= $self->_inline_check_constraint('$default') . "\n";
$code .= ' ' . $self->_inline_init_slot($attr, $instance, '$default') . "\n";
}
else {
$code .= ' ' . $self->_inline_init_slot($attr, $instance, 'undef') . "\n";
}
} else {
if ($attr->has_default) {
$code .= ' ' . $self->_inline_init_slot($attr, $instance, ('$attr->default(' . $instance . ')')) . "\n";
}
elsif ($attr->has_builder) {
$code .= ' if (my $builder = '.$instance.'->can($attr->builder)) { ' . "\n"
. ' ' . $self->_inline_init_slot($attr, $instance, ($instance . '->$builder'))
. "\n } else {\n"
. ' ' . $self->_inline_throw_error(q{sprintf "%s does not support builder method '%s' for attribute '%s'", ref(} . $instance . ') || '.$instance.', $attr->builder, $attr->name')
. ';'. "\n }";
}
else {
$code .= ' ' . $self->_inline_init_slot($attr, $instance, 'undef') . "\n";
}
}
$code .= "}\n";
return $code;
}
sub _inline_init_slot {
my ($self, $attr, $inv, $value) = @_;
if ($attr->has_initializer) {
return ('$attr->set_initial_value(' . $inv . ', ' . $value . ');');
}
else {
return $self->_inline_store($inv, $value);
}
}
sub _inline_store {
my ($self, $instance, $value) = @_;
my $attr = $self->associated_attribute;
my $mi = $attr->associated_class->get_meta_instance;
my $code = $mi->inline_set_slot_value($instance, $attr->slots, $value) . ";";
$code .= $mi->inline_weaken_slot_value($instance, $attr->slots, $value) . ";"
if $attr->is_weak_ref;
return $code;
}
sub _inline_get_old_value_for_trigger {
my ( $self, $instance ) = @_;
my $attr = $self->associated_attribute;
return '' unless $attr->has_trigger;
my $mi = $attr->associated_class->get_meta_instance;
my $pred = $mi->inline_is_slot_initialized($instance, $attr->name);
return
'my @old = '
. $pred . q{ ? }
. $self->_inline_get($instance) . q{ : ()} . ";\n";
}
sub _inline_trigger {
my ($self, $instance, $value, $old_value) = @_;
my $attr = $self->associated_attribute;
return '' unless $attr->has_trigger;
return sprintf('$attr->trigger->(%s, %s, %s);', $instance, $value, $old_value);
}
sub _inline_get {
my ($self, $instance) = @_;
my $attr = $self->associated_attribute;
my $mi = $attr->associated_class->get_meta_instance;
return $mi->inline_get_slot_value($instance, $attr->slots);
}
sub _inline_access {
my ($self, $instance) = @_;
my $attr = $self->associated_attribute;
my $mi = $attr->associated_class->get_meta_instance;
return $mi->inline_slot_access($instance, $attr->slots);
}
sub _inline_has {
my ($self, $instance) = @_;
my $attr = $self->associated_attribute;
my $mi = $attr->associated_class->get_meta_instance;
return $mi->inline_is_slot_initialized($instance, $attr->slots);
}
sub _inline_auto_deref {
my ( $self, $ref_value ) = @_;
my $attr = $self->associated_attribute;
return $ref_value unless $attr->should_auto_deref;
my $type_constraint = $attr->type_constraint;
my $sigil;
if ($type_constraint->is_a_type_of('ArrayRef')) {
$sigil = '@';
}
elsif ($type_constraint->is_a_type_of('HashRef')) {
$sigil = '%';
}
else {
$self->throw_error( "Can not auto de-reference the type constraint '"
. quotemeta( $type_constraint->name )
. "'", type_constraint => $type_constraint );
}
"(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )";
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors
=head1 DESCRIPTION
This class is a subclass of L<Class::MOP::Method::Accessor> that
provides additional Moose-specific functionality, all of which is
private.
To understand this class, you should read the the
L<Class::MOP::Method::Accessor> documentation.
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Stevan Little E<lt>stevan@iinteractive.comE<gt>
Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut