2 package Moose::Meta::Method::Accessor;
8 $VERSION = eval $VERSION;
9 our $AUTHORITY = 'cpan:STEVAN';
11 use base 'Moose::Meta::Method',
12 'Class::MOP::Method::Accessor';
16 ( ref $self && $self->associated_attribute ) || $self->SUPER::_error_thrower();
20 my ( $self, $code ) = @_;
23 # set up the environment
24 my $attr = $self->associated_attribute;
25 my $type_constraint_obj = $attr->type_constraint;
28 '$attr_name' => \$attr->name,
30 '$type_constraint_obj' => \$type_constraint_obj,
31 '$type_constraint_name' => \($type_constraint_obj && $type_constraint_obj->name),
32 '$type_constraint' => \($type_constraint_obj
33 ? $type_constraint_obj->_compiled_type_constraint
37 #warn "code for $attr_name =>\n" . $code . "\n";
38 my $sub = $self->_eval_closure($environment, $code);
39 $self->throw_error("Could not create writer for '${\$self->associated_attribute->name}' because $@ \n code: $code", error => $@, data => $code ) if $@;
44 sub generate_accessor_method_inline {
46 my $attr = $self->associated_attribute;
47 my $attr_name = $attr->name;
49 my $slot_access = $self->_inline_access($inv, $attr_name);
50 my $value_name = $self->_value_needs_copy ? '$val' : '$_[1]';
52 $self->_eval_code('sub { ' . "\n"
53 . $self->_inline_pre_body(@_) . "\n"
54 . 'if (scalar(@_) >= 2) {' . "\n"
55 . $self->_inline_copy_value . "\n"
56 . $self->_inline_check_required . "\n"
57 . $self->_inline_check_coercion . "\n"
58 . $self->_inline_check_constraint($value_name) . "\n"
59 . $self->_inline_store($inv, $value_name) . "\n"
60 . $self->_inline_trigger($inv, $value_name) . "\n"
62 . $self->_inline_check_lazy($inv) . "\n"
63 . $self->_inline_post_body(@_) . "\n"
64 . 'return ' . $self->_inline_auto_deref($self->_inline_get($inv)) . "\n"
68 sub generate_writer_method_inline {
70 my $attr = $self->associated_attribute;
71 my $attr_name = $attr->name;
73 my $slot_access = $self->_inline_get($inv, $attr_name);
74 my $value_name = $self->_value_needs_copy ? '$val' : '$_[1]';
76 $self->_eval_code('sub { '
77 . $self->_inline_pre_body(@_)
78 . $self->_inline_copy_value
79 . $self->_inline_check_required
80 . $self->_inline_check_coercion
81 . $self->_inline_check_constraint($value_name)
82 . $self->_inline_store($inv, $value_name)
83 . $self->_inline_post_body(@_)
84 . $self->_inline_trigger($inv, $value_name)
88 sub generate_reader_method_inline {
90 my $attr = $self->associated_attribute;
91 my $attr_name = $attr->name;
93 my $slot_access = $self->_inline_get($inv, $attr_name);
95 $self->_eval_code('sub {'
96 . $self->_inline_pre_body(@_)
97 . $self->_inline_throw_error('"Cannot assign a value to a read-only accessor"', 'data => \@_') . ' if @_ > 1;'
98 . $self->_inline_check_lazy($inv)
99 . $self->_inline_post_body(@_)
100 . 'return ' . $self->_inline_auto_deref( $slot_access ) . ';'
104 sub _inline_copy_value {
105 return '' unless shift->_value_needs_copy;
106 return 'my $val = $_[1];'
109 sub _value_needs_copy {
110 my $attr = (shift)->associated_attribute;
111 return $attr->should_coerce;
114 sub generate_reader_method { shift->generate_reader_method_inline(@_) }
115 sub generate_writer_method { shift->generate_writer_method_inline(@_) }
116 sub generate_accessor_method { shift->generate_accessor_method_inline(@_) }
117 sub generate_predicate_method { shift->generate_predicate_method_inline(@_) }
118 sub generate_clearer_method { shift->generate_clearer_method_inline(@_) }
120 sub _inline_pre_body { '' }
121 sub _inline_post_body { '' }
123 sub _inline_check_constraint {
124 my ($self, $value) = @_;
126 my $attr = $self->associated_attribute;
127 my $attr_name = $attr->name;
129 return '' unless $attr->has_type_constraint;
131 my $type_constraint_name = $attr->type_constraint->name;
133 qq{\$type_constraint->($value) || } . $self->_inline_throw_error(qq{"Attribute ($attr_name) does not pass the type constraint because: " . \$type_constraint_obj->get_message($value)}, "data => $value") . ";";
136 sub _inline_check_coercion {
137 my $attr = (shift)->associated_attribute;
139 return '' unless $attr->should_coerce;
140 return '$val = $attr->type_constraint->coerce($_[1]);'
143 sub _inline_check_required {
145 my $attr = $self->associated_attribute;
147 my $attr_name = $attr->name;
149 return '' unless $attr->is_required;
150 return qq{(\@_ >= 2) || } . $self->_inline_throw_error(qq{"Attribute ($attr_name) is required, so cannot be set to undef"}) . ';' # defined $_[1] is not good enough
153 sub _inline_check_lazy {
154 my ($self, $instance) = @_;
156 my $attr = $self->associated_attribute;
158 return '' unless $attr->is_lazy;
160 my $slot_access = $self->_inline_access($instance, $attr->name);
162 my $slot_exists = $self->_inline_has($instance, $attr->name);
164 my $code = 'unless (' . $slot_exists . ') {' . "\n";
165 if ($attr->has_type_constraint) {
166 if ($attr->has_default || $attr->has_builder) {
167 if ($attr->has_default) {
168 $code .= ' my $default = $attr->default(' . $instance . ');'."\n";
170 elsif ($attr->has_builder) {
171 $code .= ' my $default;'."\n".
172 ' if(my $builder = '.$instance.'->can($attr->builder)){ '."\n".
173 ' $default = '.$instance.'->$builder; '. "\n } else {\n" .
174 ' ' . $self->_inline_throw_error(q{sprintf "%s does not support builder method '%s' for attribute '%s'", ref(} . $instance . ') || '.$instance.', $attr->builder, $attr->name') .
177 $code .= ' $default = $type_constraint_obj->coerce($default);'."\n" if $attr->should_coerce;
178 $code .= ' ($type_constraint->($default))' .
179 ' || ' . $self->_inline_throw_error('"Attribute (" . $attr_name . ") does not pass the type constraint ("' .
180 ' . $type_constraint_name . ") with " . (defined($default) ? overload::StrVal($default) : "undef")' ) . ';'
182 $code .= ' ' . $self->_inline_init_slot($attr, $instance, $slot_access, '$default') . "\n";
185 $code .= ' ' . $self->_inline_init_slot($attr, $instance, $slot_access, 'undef') . "\n";
189 if ($attr->has_default) {
190 $code .= ' ' . $self->_inline_init_slot($attr, $instance, $slot_access, ('$attr->default(' . $instance . ')')) . "\n";
192 elsif ($attr->has_builder) {
193 $code .= ' if (my $builder = '.$instance.'->can($attr->builder)) { ' . "\n"
194 . ' ' . $self->_inline_init_slot($attr, $instance, $slot_access, ($instance . '->$builder'))
196 . ' ' . $self->_inline_throw_error(q{sprintf "%s does not support builder method '%s' for attribute '%s'", ref(} . $instance . ') || '.$instance.', $attr->builder, $attr->name')
200 $code .= ' ' . $self->_inline_init_slot($attr, $instance, $slot_access, 'undef') . "\n";
207 sub _inline_init_slot {
208 my ($self, $attr, $inv, $slot_access, $value) = @_;
209 if ($attr->has_initializer) {
210 return ('$attr->set_initial_value(' . $inv . ', ' . $value . ');');
213 return ($slot_access . ' = ' . $value . ';');
218 my ($self, $instance, $value) = @_;
219 my $attr = $self->associated_attribute;
221 my $mi = $attr->associated_class->get_meta_instance;
222 my $slot_name = sprintf "'%s'", $attr->slots;
224 my $code = $mi->inline_set_slot_value($instance, $slot_name, $value) . ";";
225 $code .= $mi->inline_weaken_slot_value($instance, $slot_name, $value) . ";"
226 if $attr->is_weak_ref;
230 sub _inline_trigger {
231 my ($self, $instance, $value) = @_;
232 my $attr = $self->associated_attribute;
233 return '' unless $attr->has_trigger;
234 return sprintf('$attr->trigger->(%s, %s);', $instance, $value);
238 my ($self, $instance) = @_;
239 my $attr = $self->associated_attribute;
241 my $mi = $attr->associated_class->get_meta_instance;
242 my $slot_name = sprintf "'%s'", $attr->slots;
244 return $mi->inline_get_slot_value($instance, $slot_name);
248 my ($self, $instance) = @_;
249 my $attr = $self->associated_attribute;
251 my $mi = $attr->associated_class->get_meta_instance;
252 my $slot_name = sprintf "'%s'", $attr->slots;
254 return $mi->inline_slot_access($instance, $slot_name);
258 my ($self, $instance) = @_;
259 my $attr = $self->associated_attribute;
261 my $mi = $attr->associated_class->get_meta_instance;
262 my $slot_name = sprintf "'%s'", $attr->slots;
264 return $mi->inline_is_slot_initialized($instance, $slot_name);
267 sub _inline_auto_deref {
268 my ( $self, $ref_value ) = @_;
269 my $attr = $self->associated_attribute;
271 return $ref_value unless $attr->should_auto_deref;
273 my $type_constraint = $attr->type_constraint;
276 if ($type_constraint->is_a_type_of('ArrayRef')) {
279 elsif ($type_constraint->is_a_type_of('HashRef')) {
283 $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", type_constraint => $type_constraint );
286 "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )";
297 Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors
301 This is a subclass of L<Class::MOP::Method::Accessor> and it's primary
302 responsibility is to generate the accessor methods for attributes. It
303 can handle both closure based accessors, as well as inlined source based
306 This is a fairly new addition to the MOP, but this will play an important
307 role in the optimization strategy we are currently following.
313 =item B<generate_accessor_method>
315 =item B<generate_reader_method>
317 =item B<generate_writer_method>
319 =item B<generate_predicate_method>
321 =item B<generate_clearer_method>
323 =item B<generate_accessor_method_inline>
325 =item B<generate_reader_method_inline>
327 =item B<generate_writer_method_inline>
333 All complex software has bugs lurking in it, and this module is no
334 exception. If you find a bug please either email me, or add the bug
339 Stevan Little E<lt>stevan@iinteractive.comE<gt>
341 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
343 =head1 COPYRIGHT AND LICENSE
345 Copyright 2006-2008 by Infinity Interactive, Inc.
347 L<http://www.iinteractive.com>
349 This library is free software; you can redistribute it and/or modify
350 it under the same terms as Perl itself.