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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 = '0.03'; |
10 | our $AUTHORITY = 'cpan:STEVAN'; |
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11 | |
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12 | use base 'Moose::Meta::Method', |
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13 | 'Class::MOP::Method::Accessor'; |
14 | |
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15 | ## Inline method generators |
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16 | |
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17 | sub generate_accessor_method_inline { |
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18 | my $self = shift; |
19 | my $attr = $self->associated_attribute; |
20 | my $attr_name = $attr->name; |
21 | |
22 | my $value_name = $attr->should_coerce ? '$val' : '$_[1]'; |
23 | my $mi = $attr->associated_class->get_meta_instance; |
24 | my $slot_name = sprintf "'%s'", $attr->slots; |
25 | my $inv = '$_[0]'; |
26 | my $code = 'sub { ' |
27 | . 'if (scalar(@_) == 2) {' |
28 | . $self->_inline_check_required |
29 | . $self->_inline_check_coercion |
30 | . $self->_inline_check_constraint($value_name) |
31 | . $self->_inline_store($inv, $value_name) |
32 | . $self->_inline_trigger($inv, $value_name) |
33 | . ' }' |
34 | . $self->_inline_check_lazy |
35 | . 'return ' . $self->_inline_auto_deref($self->_inline_get($inv)) |
36 | . ' }'; |
37 | |
38 | # NOTE: |
39 | # set up the environment |
40 | my $type_constraint = $attr->type_constraint |
41 | ? $attr->type_constraint->_compiled_type_constraint |
42 | : undef; |
43 | |
44 | my $sub = eval $code; |
45 | confess "Could not create accessor for '$attr_name' because $@ \n code: $code" if $@; |
46 | return $sub; |
47 | } |
48 | |
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49 | sub generate_writer_method_inline { |
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50 | my $self = shift; |
51 | my $attr = $self->associated_attribute; |
52 | my $attr_name = $attr->name; |
53 | |
54 | my $value_name = $attr->should_coerce ? '$val' : '$_[1]'; |
55 | my $inv = '$_[0]'; |
56 | my $code = 'sub { ' |
57 | . $self->_inline_check_required |
58 | . $self->_inline_check_coercion |
59 | . $self->_inline_check_constraint($value_name) |
60 | . $self->_inline_store($inv, $value_name) |
61 | . $self->_inline_trigger($inv, $value_name) |
62 | . ' }'; |
63 | |
64 | # NOTE: |
65 | # set up the environment |
66 | my $type_constraint = $attr->type_constraint |
67 | ? $attr->type_constraint->_compiled_type_constraint |
68 | : undef; |
69 | |
70 | my $sub = eval $code; |
71 | confess "Could not create writer for '$attr_name' because $@ \n code: $code" if $@; |
72 | return $sub; |
73 | } |
74 | |
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75 | sub generate_reader_method_inline { |
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76 | my $self = shift; |
77 | my $attr = $self->associated_attribute; |
78 | my $attr_name = $attr->name; |
79 | |
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80 | my $code = 'sub {' |
81 | . 'confess "Cannot assign a value to a read-only accessor" if @_ > 1;' |
82 | . $self->_inline_check_lazy |
83 | . 'return ' . $self->_inline_auto_deref( '$_[0]->{$attr_name}' ) . ';' |
84 | . '}'; |
7bffa230 |
85 | |
86 | # NOTE: |
87 | # set up the environment |
88 | my $type_constraint = $attr->type_constraint |
89 | ? $attr->type_constraint->_compiled_type_constraint |
90 | : undef; |
91 | |
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92 | my $sub = eval $code; |
93 | confess "Could not create reader for '$attr_name' because $@ \n code: $code" if $@; |
94 | return $sub; |
95 | } |
96 | |
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97 | *generate_reader_method = \&generate_reader_method_inline; |
98 | *generate_writer_method = \&generate_writer_method_inline; |
99 | *generate_accessor_method = \&generate_accessor_method_inline; |
100 | |
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101 | sub _inline_check_constraint { |
102 | my ($self, $value) = @_; |
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103 | |
104 | my $attr = $self->associated_attribute; |
105 | |
106 | return '' unless $attr->has_type_constraint; |
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107 | |
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108 | return sprintf <<'EOF', $value, $value, $value, $value |
109 | defined($type_constraint->(%s)) |
110 | || confess "Attribute (" . $attr->name . ") does not pass the type constraint (" |
111 | . $attr->type_constraint->name . ") with " . (defined(%s) ? "'%s'" : "undef") |
112 | if defined(%s); |
113 | EOF |
114 | } |
115 | |
116 | sub _inline_check_coercion { |
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117 | my $attr = (shift)->associated_attribute; |
118 | |
119 | return '' unless $attr->should_coerce; |
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120 | return 'my $val = $attr->type_constraint->coerce($_[1]);' |
121 | } |
122 | |
123 | sub _inline_check_required { |
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124 | my $attr = (shift)->associated_attribute; |
125 | |
126 | return '' unless $attr->is_required; |
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127 | return 'defined($_[1]) || confess "Attribute ($attr_name) is required, so cannot be set to undef";' |
128 | } |
129 | |
130 | sub _inline_check_lazy { |
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131 | my $attr = (shift)->associated_attribute; |
132 | |
133 | return '' unless $attr->is_lazy; |
134 | |
135 | if ($attr->has_type_constraint) { |
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136 | # NOTE: |
137 | # this could probably be cleaned |
138 | # up and streamlined a little more |
139 | return 'unless (exists $_[0]->{$attr_name}) {' . |
140 | ' if ($attr->has_default) {' . |
141 | ' my $default = $attr->default($_[0]);' . |
142 | ' (defined($type_constraint->($default)))' . |
143 | ' || confess "Attribute (" . $attr->name . ") does not pass the type constraint ("' . |
144 | ' . $attr->type_constraint->name . ") with " . (defined($default) ? "\'$default\'" : "undef")' . |
145 | ' if defined($default);' . |
146 | ' $_[0]->{$attr_name} = $default; ' . |
147 | ' }' . |
148 | ' else {' . |
149 | ' $_[0]->{$attr_name} = undef;' . |
150 | ' }' . |
151 | '}'; |
152 | } |
153 | return '$_[0]->{$attr_name} = ($attr->has_default ? $attr->default($_[0]) : undef)' |
154 | . 'unless exists $_[0]->{$attr_name};'; |
155 | } |
156 | |
157 | |
158 | sub _inline_store { |
159 | my ($self, $instance, $value) = @_; |
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160 | my $attr = $self->associated_attribute; |
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161 | |
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162 | my $mi = $attr->associated_class->get_meta_instance; |
163 | my $slot_name = sprintf "'%s'", $attr->slots; |
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164 | |
165 | my $code = $mi->inline_set_slot_value($instance, $slot_name, $value) . ";"; |
166 | $code .= $mi->inline_weaken_slot_value($instance, $slot_name, $value) . ";" |
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167 | if $attr->is_weak_ref; |
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168 | return $code; |
169 | } |
170 | |
171 | sub _inline_trigger { |
172 | my ($self, $instance, $value) = @_; |
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173 | my $attr = $self->associated_attribute; |
174 | return '' unless $attr->has_trigger; |
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175 | return sprintf('$attr->trigger->(%s, %s, $attr);', $instance, $value); |
176 | } |
177 | |
178 | sub _inline_get { |
179 | my ($self, $instance) = @_; |
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180 | my $attr = $self->associated_attribute; |
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181 | |
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182 | my $mi = $attr->associated_class->get_meta_instance; |
183 | my $slot_name = sprintf "'%s'", $attr->slots; |
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184 | |
185 | return $mi->inline_get_slot_value($instance, $slot_name); |
186 | } |
187 | |
188 | sub _inline_auto_deref { |
189 | my ( $self, $ref_value ) = @_; |
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190 | my $attr = $self->associated_attribute; |
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191 | |
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192 | return $ref_value unless $attr->should_auto_deref; |
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193 | |
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194 | my $type_constraint = $attr->type_constraint; |
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195 | |
196 | my $sigil; |
197 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
198 | $sigil = '@'; |
199 | } |
200 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
201 | $sigil = '%'; |
202 | } |
203 | else { |
204 | confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'"; |
205 | } |
206 | |
207 | "(wantarray() ? $sigil\{ ( $ref_value ) || return } : ( $ref_value ) )"; |
208 | } |
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209 | |
210 | 1; |
211 | |
212 | __END__ |
213 | |
214 | =pod |
215 | |
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216 | =head1 NAME |
217 | |
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218 | Moose::Meta::Method::Accessor - A Moose Method metaclass for accessors |
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219 | |
220 | =head1 DESCRIPTION |
221 | |
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222 | This is a subclass of L<Class::MOP::Method::Accessor> and it's primary |
223 | responsibility is to generate the accessor methods for attributes. It |
224 | can handle both closure based accessors, as well as inlined source based |
225 | accessors. |
226 | |
227 | This is a fairly new addition to the MOP, but this will play an important |
228 | role in the optimization strategy we are currently following. |
229 | |
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230 | =head1 METHODS |
231 | |
232 | =over 4 |
233 | |
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234 | =item B<generate_accessor_method> |
235 | |
236 | =item B<generate_reader_method> |
237 | |
238 | =item B<generate_writer_method> |
239 | |
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240 | =item B<generate_accessor_method_inline> |
241 | |
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242 | =item B<generate_reader_method_inline> |
243 | |
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244 | =item B<generate_writer_method_inline> |
245 | |
246 | =back |
247 | |
248 | =head1 BUGS |
249 | |
250 | All complex software has bugs lurking in it, and this module is no |
251 | exception. If you find a bug please either email me, or add the bug |
252 | to cpan-RT. |
253 | |
254 | =head1 AUTHOR |
255 | |
256 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
257 | |
258 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
259 | |
260 | =head1 COPYRIGHT AND LICENSE |
261 | |
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262 | Copyright 2006, 2007 by Infinity Interactive, Inc. |
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263 | |
264 | L<http://www.iinteractive.com> |
265 | |
266 | This library is free software; you can redistribute it and/or modify |
267 | it under the same terms as Perl itself. |
268 | |
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269 | =cut |