2 package Moose::Meta::Method::Accessor;
10 $VERSION = eval $VERSION;
11 our $AUTHORITY = 'cpan:STEVAN';
13 use base 'Moose::Meta::Method',
14 'Class::MOP::Method::Accessor';
18 return $self->associated_attribute
19 if ref($self) && defined($self->associated_attribute);
20 return $self->SUPER::_error_thrower;
27 $self->SUPER::_compile_code(@args);
31 'Could not create writer for '
32 . "'" . $self->associated_attribute->name . "' "
39 sub _eval_environment {
42 my $attr = $self->associated_attribute;
43 my $type_constraint_obj = $attr->type_constraint;
48 '$type_constraint_obj' => \$type_constraint_obj,
49 '$type_constraint' => \(
51 ? $type_constraint_obj->_compiled_type_constraint
57 sub _generate_accessor_method_inline {
61 my $slot_access = $self->_inline_get($inv);
62 my $value = $self->_value_needs_copy ? '$val' : '$_[1]';
65 $self->_compile_code([
67 $self->_inline_pre_body(@_),
68 'if (scalar(@_) >= 2) {',
69 $self->_inline_copy_value($value),
70 $self->_inline_check_required,
71 $self->_inline_tc_code($value),
72 $self->_inline_get_old_value_for_trigger($inv, $old),
73 $self->_inline_store($inv, $value),
74 $self->_inline_trigger($inv, $value, $old),
76 $self->_inline_check_lazy($inv),
77 $self->_inline_post_body(@_),
78 'return ' . $self->_inline_auto_deref($slot_access) . ';',
83 sub _generate_writer_method_inline {
87 my $value = $self->_value_needs_copy ? '$val' : '$_[1]';
90 $self->_compile_code([
92 $self->_inline_pre_body(@_),
93 $self->_inline_copy_value($value),
94 $self->_inline_check_required,
95 $self->_inline_tc_code($value),
96 $self->_inline_get_old_value_for_trigger($inv, $old),
97 $self->_inline_store($inv, $value),
98 $self->_inline_post_body(@_),
99 $self->_inline_trigger($inv, $value, $old),
104 sub _generate_reader_method_inline {
108 my $slot_access = $self->_inline_get($inv);
110 $self->_compile_code([
112 $self->_inline_pre_body(@_),
114 $self->_inline_throw_error(
115 '"Cannot assign a value to a read-only accessor"',
119 $self->_inline_check_lazy($inv),
120 $self->_inline_post_body(@_),
121 'return ' . $self->_inline_auto_deref($slot_access) . ';',
126 sub _inline_copy_value {
130 return '' unless $self->_value_needs_copy;
131 return 'my ' . $value . ' = $_[1];'
134 sub _value_needs_copy {
136 return $self->associated_attribute->should_coerce;
139 sub _instance_is_inlinable {
141 return $self->associated_attribute->associated_class->instance_metaclass->is_inlinable;
144 sub _generate_reader_method {
146 $self->_instance_is_inlinable ? $self->_generate_reader_method_inline(@_)
147 : $self->SUPER::_generate_reader_method(@_);
150 sub _generate_writer_method {
152 $self->_instance_is_inlinable ? $self->_generate_writer_method_inline(@_)
153 : $self->SUPER::_generate_writer_method(@_);
156 sub _generate_accessor_method {
158 $self->_instance_is_inlinable ? $self->_generate_accessor_method_inline(@_)
159 : $self->SUPER::_generate_accessor_method(@_);
162 sub _generate_predicate_method {
164 $self->_instance_is_inlinable ? $self->_generate_predicate_method_inline(@_)
165 : $self->SUPER::_generate_predicate_method(@_);
168 sub _generate_clearer_method {
170 $self->_instance_is_inlinable ? $self->_generate_clearer_method_inline(@_)
171 : $self->SUPER::_generate_clearer_method(@_);
174 sub _inline_pre_body { return }
175 sub _inline_post_body { return }
177 sub _inline_check_constraint {
181 my $attr = $self->associated_attribute;
182 return '' unless $attr->has_type_constraint;
184 my $attr_name = quotemeta( $attr->name );
186 return 'if (!$type_constraint->(' . $value . ')) {',
187 $self->_inline_throw_error(
188 '"Attribute (' . $attr_name . ') does not pass the type '
189 . 'constraint because: " . '
190 . '$type_constraint_obj->get_message(' . $value . ')',
196 sub _inline_tc_code {
199 $self->_inline_check_coercion(@_),
200 $self->_inline_check_constraint(@_),
204 sub _inline_check_coercion {
208 my $attr = $self->associated_attribute;
209 return '' unless $attr->should_coerce
210 && $attr->type_constraint->has_coercion;
212 return $value . ' = $type_constraint_obj->coerce(' . $value . ');';
215 sub _inline_check_required {
218 my $attr = $self->associated_attribute;
219 return '' unless $attr->is_required;
221 my $attr_name = quotemeta( $attr->name );
223 return 'if (@_ < 2) {',
224 $self->_inline_throw_error(
225 '"Attribute (' . $attr_name . ') is required, so cannot '
226 . 'be set to undef"' # defined $_[1] is not good enough
231 sub _inline_check_lazy {
233 my ($instance, $default) = @_;
235 my $attr = $self->associated_attribute;
236 return unless $attr->is_lazy;
238 my $slot_exists = $self->_inline_has($instance);
240 return 'if (!' . $slot_exists . ') {',
241 $self->_inline_init_from_default($instance, '$default', 'lazy'),
245 sub _inline_init_from_default {
247 my ($instance, $default, $for_lazy) = @_;
249 my $attr = $self->associated_attribute;
250 # XXX: should this throw an error instead?
251 return $self->_inline_init_slot($attr, $instance, 'undef')
252 unless $attr->has_default || $attr->has_builder;
254 return $self->_inline_generate_default($instance, $default),
255 $attr->has_type_constraint
256 # intentionally not using _inline_tc_code, since that can be
257 # overridden to do things like possibly only do member tc
258 # checks, which isn't appropriate for checking the result
260 ? ($self->_inline_check_coercion($default, $for_lazy),
261 $self->_inline_check_constraint($default, $for_lazy))
263 $self->_inline_init_slot($attr, $instance, $default);
266 sub _inline_generate_default {
268 my ($instance, $default) = @_;
270 my $attr = $self->associated_attribute;
272 if ($attr->has_default) {
273 return 'my ' . $default . ' = $attr->default(' . $instance . ');';
275 elsif ($attr->has_builder) {
276 return 'my ' . $default . ';',
277 'if (my $builder = ' . $instance . '->can($attr->builder)) {',
278 $default . ' = ' . $instance . '->$builder;',
281 'my $class = ref(' . $instance . ') || ' . $instance . ';',
282 'my $builder_name = $attr->builder;',
283 'my $attr_name = $attr->name;',
284 $self->_inline_throw_error(
285 '"$class does not support builder method '
286 . '\'$builder_name\' for attribute \'$attr_name\'"'
291 $self->throw_error("Can't generate a default for " . $attr->name
292 . " since no default or builder was specified");
296 sub _inline_init_slot {
298 my ($attr, $inv, $value) = @_;
300 if ($attr->has_initializer) {
301 return '$attr->set_initial_value(' . $inv . ', ' . $value . ');';
304 return $self->_inline_store($inv, $value) . ';';
310 my ($instance, $value) = @_;
312 return $self->associated_attribute->inline_set( $instance, $value ) . ';';
315 sub _inline_get_old_value_for_trigger {
317 my ($instance, $old) = @_;
319 my $attr = $self->associated_attribute;
320 return '' unless $attr->has_trigger;
322 return 'my ' . $old . ' = ' . $self->_inline_has($instance)
323 . ' ? ' . $self->_inline_get($instance)
327 sub _inline_trigger {
329 my ($instance, $value, $old) = @_;
331 my $attr = $self->associated_attribute;
332 return '' unless $attr->has_trigger;
334 return sprintf('$attr->trigger->(%s, %s, %s);', $instance, $value, $old);
340 my ($self, $instance) = @_;
342 return $self->associated_attribute->inline_get($instance);
346 my ($self, $instance) = @_;
348 return $self->associated_attribute->inline_has($instance);
351 sub _inline_auto_deref {
353 my ($ref_value) = @_;
355 my $attr = $self->associated_attribute;
356 return $ref_value unless $attr->should_auto_deref;
358 my $type_constraint = $attr->type_constraint;
361 if ($type_constraint->is_a_type_of('ArrayRef')) {
364 elsif ($type_constraint->is_a_type_of('HashRef')) {
369 "Can not auto de-reference the type constraint '"
370 . $type_constraint->name
372 type_constraint => $type_constraint,
376 "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )";
387 Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors
391 This class is a subclass of L<Class::MOP::Method::Accessor> that
392 provides additional Moose-specific functionality, all of which is
395 To understand this class, you should read the the
396 L<Class::MOP::Method::Accessor> documentation.
400 See L<Moose/BUGS> for details on reporting bugs.
404 Stevan Little E<lt>stevan@iinteractive.comE<gt>
406 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
408 =head1 COPYRIGHT AND LICENSE
410 Copyright 2006-2010 by Infinity Interactive, Inc.
412 L<http://www.iinteractive.com>
414 This library is free software; you can redistribute it and/or modify
415 it under the same terms as Perl itself.