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1 | |
2 | package Moose::Meta::Method::Accessor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
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7 | use Carp 'confess'; |
8 | |
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9 | our $VERSION = '0.01'; |
10 | |
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11 | use base 'Moose::Meta::Method', |
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12 | 'Class::MOP::Method::Accessor'; |
13 | |
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14 | ## Inline method generators |
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15 | |
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16 | sub generate_accessor_method_inline { |
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17 | my $self = shift; |
18 | my $attr = $self->associated_attribute; |
19 | my $attr_name = $attr->name; |
20 | |
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; |
24 | my $inv = '$_[0]'; |
25 | my $code = 'sub { ' |
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) |
32 | . ' }' |
33 | . $self->_inline_check_lazy |
34 | . 'return ' . $self->_inline_auto_deref($self->_inline_get($inv)) |
35 | . ' }'; |
36 | |
37 | # NOTE: |
38 | # set up the environment |
39 | my $type_constraint = $attr->type_constraint |
40 | ? $attr->type_constraint->_compiled_type_constraint |
41 | : undef; |
42 | |
43 | my $sub = eval $code; |
44 | confess "Could not create accessor for '$attr_name' because $@ \n code: $code" if $@; |
45 | return $sub; |
46 | } |
47 | |
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48 | sub generate_writer_method_inline { |
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49 | my $self = shift; |
50 | my $attr = $self->associated_attribute; |
51 | my $attr_name = $attr->name; |
52 | |
53 | my $value_name = $attr->should_coerce ? '$val' : '$_[1]'; |
54 | my $inv = '$_[0]'; |
55 | my $code = 'sub { ' |
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) |
61 | . ' }'; |
62 | |
63 | # NOTE: |
64 | # set up the environment |
65 | my $type_constraint = $attr->type_constraint |
66 | ? $attr->type_constraint->_compiled_type_constraint |
67 | : undef; |
68 | |
69 | my $sub = eval $code; |
70 | confess "Could not create writer for '$attr_name' because $@ \n code: $code" if $@; |
71 | return $sub; |
72 | } |
73 | |
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74 | sub generate_reader_method_inline { |
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75 | my $self = shift; |
76 | my $attr = $self->associated_attribute; |
77 | my $attr_name = $attr->name; |
78 | |
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79 | my $code = 'sub {' |
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}' ) . ';' |
83 | . '}'; |
84 | my $sub = eval $code; |
85 | confess "Could not create reader for '$attr_name' because $@ \n code: $code" if $@; |
86 | return $sub; |
87 | } |
88 | |
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89 | ## ... private helpers |
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90 | |
91 | sub _inline_check_constraint { |
92 | my ($self, $value) = @_; |
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93 | |
94 | my $attr = $self->associated_attribute; |
95 | |
96 | return '' unless $attr->has_type_constraint; |
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97 | |
98 | # FIXME - remove 'unless defined($value) - constraint Undef |
99 | return sprintf <<'EOF', $value, $value, $value, $value |
100 | defined($type_constraint->(%s)) |
101 | || confess "Attribute (" . $attr->name . ") does not pass the type constraint (" |
102 | . $attr->type_constraint->name . ") with " . (defined(%s) ? "'%s'" : "undef") |
103 | if defined(%s); |
104 | EOF |
105 | } |
106 | |
107 | sub _inline_check_coercion { |
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108 | my $attr = (shift)->associated_attribute; |
109 | |
110 | return '' unless $attr->should_coerce; |
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111 | return 'my $val = $attr->type_constraint->coerce($_[1]);' |
112 | } |
113 | |
114 | sub _inline_check_required { |
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115 | my $attr = (shift)->associated_attribute; |
116 | |
117 | return '' unless $attr->is_required; |
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118 | return 'defined($_[1]) || confess "Attribute ($attr_name) is required, so cannot be set to undef";' |
119 | } |
120 | |
121 | sub _inline_check_lazy { |
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122 | my $attr = (shift)->associated_attribute; |
123 | |
124 | return '' unless $attr->is_lazy; |
125 | |
126 | if ($attr->has_type_constraint) { |
d617b644 |
127 | # NOTE: |
128 | # this could probably be cleaned |
129 | # up and streamlined a little more |
130 | return 'unless (exists $_[0]->{$attr_name}) {' . |
131 | ' if ($attr->has_default) {' . |
132 | ' my $default = $attr->default($_[0]);' . |
133 | ' (defined($type_constraint->($default)))' . |
134 | ' || confess "Attribute (" . $attr->name . ") does not pass the type constraint ("' . |
135 | ' . $attr->type_constraint->name . ") with " . (defined($default) ? "\'$default\'" : "undef")' . |
136 | ' if defined($default);' . |
137 | ' $_[0]->{$attr_name} = $default; ' . |
138 | ' }' . |
139 | ' else {' . |
140 | ' $_[0]->{$attr_name} = undef;' . |
141 | ' }' . |
142 | '}'; |
143 | } |
144 | return '$_[0]->{$attr_name} = ($attr->has_default ? $attr->default($_[0]) : undef)' |
145 | . 'unless exists $_[0]->{$attr_name};'; |
146 | } |
147 | |
148 | |
149 | sub _inline_store { |
150 | my ($self, $instance, $value) = @_; |
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151 | my $attr = $self->associated_attribute; |
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152 | |
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153 | my $mi = $attr->associated_class->get_meta_instance; |
154 | my $slot_name = sprintf "'%s'", $attr->slots; |
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155 | |
156 | my $code = $mi->inline_set_slot_value($instance, $slot_name, $value) . ";"; |
157 | $code .= $mi->inline_weaken_slot_value($instance, $slot_name, $value) . ";" |
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158 | if $attr->is_weak_ref; |
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159 | return $code; |
160 | } |
161 | |
162 | sub _inline_trigger { |
163 | my ($self, $instance, $value) = @_; |
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164 | my $attr = $self->associated_attribute; |
165 | return '' unless $attr->has_trigger; |
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166 | return sprintf('$attr->trigger->(%s, %s, $attr);', $instance, $value); |
167 | } |
168 | |
169 | sub _inline_get { |
170 | my ($self, $instance) = @_; |
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171 | my $attr = $self->associated_attribute; |
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172 | |
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173 | my $mi = $attr->associated_class->get_meta_instance; |
174 | my $slot_name = sprintf "'%s'", $attr->slots; |
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175 | |
176 | return $mi->inline_get_slot_value($instance, $slot_name); |
177 | } |
178 | |
179 | sub _inline_auto_deref { |
180 | my ( $self, $ref_value ) = @_; |
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181 | my $attr = $self->associated_attribute; |
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182 | |
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183 | return $ref_value unless $attr->should_auto_deref; |
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184 | |
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185 | my $type_constraint = $attr->type_constraint; |
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186 | |
187 | my $sigil; |
188 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
189 | $sigil = '@'; |
190 | } |
191 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
192 | $sigil = '%'; |
193 | } |
194 | else { |
195 | confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'"; |
196 | } |
197 | |
198 | "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )"; |
199 | } |
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200 | |
201 | 1; |
202 | |
203 | __END__ |
204 | |
205 | =pod |
206 | |
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207 | =head1 NAME |
208 | |
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209 | Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors |
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210 | |
211 | =head1 DESCRIPTION |
212 | |
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213 | This is a subclass of L<Class::MOP::Method::Accessor> and it's primary |
214 | responsibility is to generate the accessor methods for attributes. It |
215 | can handle both closure based accessors, as well as inlined source based |
216 | accessors. |
217 | |
218 | This is a fairly new addition to the MOP, but this will play an important |
219 | role in the optimization strategy we are currently following. |
220 | |
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221 | =head1 METHODS |
222 | |
223 | =over 4 |
224 | |
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225 | =item B<generate_accessor_method_inline> |
226 | |
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227 | =item B<generate_reader_method_inline> |
228 | |
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229 | =item B<generate_writer_method_inline> |
230 | |
231 | =back |
232 | |
233 | =head1 BUGS |
234 | |
235 | All complex software has bugs lurking in it, and this module is no |
236 | exception. If you find a bug please either email me, or add the bug |
237 | to cpan-RT. |
238 | |
239 | =head1 AUTHOR |
240 | |
241 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
242 | |
243 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
244 | |
245 | =head1 COPYRIGHT AND LICENSE |
246 | |
247 | Copyright 2006 by Infinity Interactive, Inc. |
248 | |
249 | L<http://www.iinteractive.com> |
250 | |
251 | This library is free software; you can redistribute it and/or modify |
252 | it under the same terms as Perl itself. |
253 | |
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254 | =cut |