2 package Moose::Meta::Method::Accessor;
11 use base 'Moose::Meta::Method',
12 'Class::MOP::Method::Accessor';
14 ## Inline method generators
16 sub generate_accessor_method_inline {
18 my $attr = $self->associated_attribute;
19 my $attr_name = $attr->name;
21 my $value_name = $attr->should_coerce ? '$val' : '$_[1]';
22 my $mi = $attr->associated_class->get_meta_instance;
23 my $slot_name = sprintf "'%s'", $attr->slots;
26 . 'if (scalar(@_) == 2) {'
27 . $self->_inline_check_required
28 . $self->_inline_check_coercion
29 . $self->_inline_check_constraint($value_name)
30 . $self->_inline_store($inv, $value_name)
31 . $self->_inline_trigger($inv, $value_name)
33 . $self->_inline_check_lazy
34 . 'return ' . $self->_inline_auto_deref($self->_inline_get($inv))
38 # set up the environment
39 my $type_constraint = $attr->type_constraint
40 ? $attr->type_constraint->_compiled_type_constraint
44 confess "Could not create accessor for '$attr_name' because $@ \n code: $code" if $@;
48 sub generate_writer_method_inline {
50 my $attr = $self->associated_attribute;
51 my $attr_name = $attr->name;
53 my $value_name = $attr->should_coerce ? '$val' : '$_[1]';
56 . $self->_inline_check_required
57 . $self->_inline_check_coercion
58 . $self->_inline_check_constraint($value_name)
59 . $self->_inline_store($inv, $value_name)
60 . $self->_inline_trigger($inv, $value_name)
64 # set up the environment
65 my $type_constraint = $attr->type_constraint
66 ? $attr->type_constraint->_compiled_type_constraint
70 confess "Could not create writer for '$attr_name' because $@ \n code: $code" if $@;
74 sub generate_reader_method_inline {
76 my $attr = $self->associated_attribute;
77 my $attr_name = $attr->name;
80 . 'confess "Cannot assign a value to a read-only accessor" if @_ > 1;'
81 . $self->_inline_check_lazy
82 . 'return ' . $self->_inline_auto_deref( '$_[0]->{$attr_name}' ) . ';'
85 confess "Could not create reader for '$attr_name' because $@ \n code: $code" if $@;
89 ## normal method generators
91 *generate_reader_method = \&generate_reader_method_inline;
92 *generate_writer_method = \&generate_writer_method_inline;
93 *generate_accessor_method = \&generate_accessor_method_inline;
95 ## ... private helpers
97 sub _inline_check_constraint {
98 my ($self, $value) = @_;
100 my $attr = $self->associated_attribute;
102 return '' unless $attr->has_type_constraint;
104 # FIXME - remove 'unless defined($value) - constraint Undef
105 return sprintf <<'EOF', $value, $value, $value, $value
106 defined($type_constraint->(%s))
107 || confess "Attribute (" . $attr->name . ") does not pass the type constraint ("
108 . $attr->type_constraint->name . ") with " . (defined(%s) ? "'%s'" : "undef")
113 sub _inline_check_coercion {
114 my $attr = (shift)->associated_attribute;
116 return '' unless $attr->should_coerce;
117 return 'my $val = $attr->type_constraint->coerce($_[1]);'
120 sub _inline_check_required {
121 my $attr = (shift)->associated_attribute;
123 return '' unless $attr->is_required;
124 return 'defined($_[1]) || confess "Attribute ($attr_name) is required, so cannot be set to undef";'
127 sub _inline_check_lazy {
128 my $attr = (shift)->associated_attribute;
130 return '' unless $attr->is_lazy;
132 if ($attr->has_type_constraint) {
134 # this could probably be cleaned
135 # up and streamlined a little more
136 return 'unless (exists $_[0]->{$attr_name}) {' .
137 ' if ($attr->has_default) {' .
138 ' my $default = $attr->default($_[0]);' .
139 ' (defined($type_constraint->($default)))' .
140 ' || confess "Attribute (" . $attr->name . ") does not pass the type constraint ("' .
141 ' . $attr->type_constraint->name . ") with " . (defined($default) ? "\'$default\'" : "undef")' .
142 ' if defined($default);' .
143 ' $_[0]->{$attr_name} = $default; ' .
146 ' $_[0]->{$attr_name} = undef;' .
150 return '$_[0]->{$attr_name} = ($attr->has_default ? $attr->default($_[0]) : undef)'
151 . 'unless exists $_[0]->{$attr_name};';
156 my ($self, $instance, $value) = @_;
157 my $attr = $self->associated_attribute;
159 my $mi = $attr->associated_class->get_meta_instance;
160 my $slot_name = sprintf "'%s'", $attr->slots;
162 my $code = $mi->inline_set_slot_value($instance, $slot_name, $value) . ";";
163 $code .= $mi->inline_weaken_slot_value($instance, $slot_name, $value) . ";"
164 if $attr->is_weak_ref;
168 sub _inline_trigger {
169 my ($self, $instance, $value) = @_;
170 my $attr = $self->associated_attribute;
171 return '' unless $attr->has_trigger;
172 return sprintf('$attr->trigger->(%s, %s, $attr);', $instance, $value);
176 my ($self, $instance) = @_;
177 my $attr = $self->associated_attribute;
179 my $mi = $attr->associated_class->get_meta_instance;
180 my $slot_name = sprintf "'%s'", $attr->slots;
182 return $mi->inline_get_slot_value($instance, $slot_name);
185 sub _inline_auto_deref {
186 my ( $self, $ref_value ) = @_;
187 my $attr = $self->associated_attribute;
189 return $ref_value unless $attr->should_auto_deref;
191 my $type_constraint = $attr->type_constraint;
194 if ($type_constraint->is_a_type_of('ArrayRef')) {
197 elsif ($type_constraint->is_a_type_of('HashRef')) {
201 confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'";
204 "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )";
215 Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors
219 This is a subclass of L<Class::MOP::Method::Accessor> and it's primary
220 responsibility is to generate the accessor methods for attributes. It
221 can handle both closure based accessors, as well as inlined source based
224 This is a fairly new addition to the MOP, but this will play an important
225 role in the optimization strategy we are currently following.
231 =item B<generate_accessor_method>
233 =item B<generate_reader_method>
235 =item B<generate_writer_method>
237 =item B<generate_accessor_method_inline>
239 =item B<generate_reader_method_inline>
241 =item B<generate_writer_method_inline>
247 All complex software has bugs lurking in it, and this module is no
248 exception. If you find a bug please either email me, or add the bug
253 Stevan Little E<lt>stevan@iinteractive.comE<gt>
255 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
257 =head1 COPYRIGHT AND LICENSE
259 Copyright 2006 by Infinity Interactive, Inc.
261 L<http://www.iinteractive.com>
263 This library is free software; you can redistribute it and/or modify
264 it under the same terms as Perl itself.