Commit | Line | Data |
5cf3dbcf |
1 | |
2 | package Moose::Meta::Method::Constructor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed', 'weaken', 'looks_like_number'; |
9 | |
eaa35e6e |
10 | our $VERSION = '0.50'; |
5cf3dbcf |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
badb7e89 |
13 | use base 'Moose::Meta::Method', |
14 | 'Class::MOP::Method::Generated'; |
5cf3dbcf |
15 | |
16 | sub new { |
17 | my $class = shift; |
18 | my %options = @_; |
7a5b07b3 |
19 | |
5cf3dbcf |
20 | (exists $options{options} && ref $options{options} eq 'HASH') |
7a5b07b3 |
21 | || confess "You must pass a hash of options"; |
22 | |
1b2aea39 |
23 | ($options{package_name} && $options{name}) |
d3308256 |
24 | || confess "You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT"; |
1b2aea39 |
25 | |
5cf3dbcf |
26 | my $self = bless { |
27 | # from our superclass |
1b2aea39 |
28 | '&!body' => undef, |
29 | '$!package_name' => $options{package_name}, |
30 | '$!name' => $options{name}, |
5cf3dbcf |
31 | # specific to this subclass |
32 | '%!options' => $options{options}, |
587ae0d2 |
33 | '$!meta_instance' => $options{metaclass}->get_meta_instance, |
7a5b07b3 |
34 | '@!attributes' => [ $options{metaclass}->compute_all_applicable_attributes ], |
5cf3dbcf |
35 | # ... |
36 | '$!associated_metaclass' => $options{metaclass}, |
37 | } => $class; |
38 | |
7a5b07b3 |
39 | # we don't want this creating |
40 | # a cycle in the code, if not |
5cf3dbcf |
41 | # needed |
7a5b07b3 |
42 | weaken($self->{'$!associated_metaclass'}); |
5cf3dbcf |
43 | |
415e6f85 |
44 | $self->initialize_body; |
5cf3dbcf |
45 | |
7a5b07b3 |
46 | return $self; |
5cf3dbcf |
47 | } |
48 | |
7a5b07b3 |
49 | ## accessors |
5cf3dbcf |
50 | |
51 | sub options { (shift)->{'%!options'} } |
52 | sub meta_instance { (shift)->{'$!meta_instance'} } |
53 | sub attributes { (shift)->{'@!attributes'} } |
54 | |
55 | sub associated_metaclass { (shift)->{'$!associated_metaclass'} } |
56 | |
57 | ## method |
58 | |
384c126d |
59 | # this was changed in 0.41, but broke MooseX::Singleton, so try to catch |
60 | # any other code using the original broken spelling |
61 | sub intialize_body { confess "Please correct the spelling of 'intialize_body' to 'initialize_body'" } |
62 | |
415e6f85 |
63 | sub initialize_body { |
5cf3dbcf |
64 | my $self = shift; |
65 | # TODO: |
7a5b07b3 |
66 | # the %options should also include a both |
67 | # a call 'initializer' and call 'SUPER::' |
68 | # options, which should cover approx 90% |
69 | # of the possible use cases (even if it |
70 | # requires some adaption on the part of |
5cf3dbcf |
71 | # the author, after all, nothing is free) |
72 | my $source = 'sub {'; |
1f779926 |
73 | $source .= "\n" . 'my $class = shift;'; |
7a5b07b3 |
74 | |
587ae0d2 |
75 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
7a5b07b3 |
76 | $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';'; |
77 | |
78 | $source .= "\n" . 'my %params = (scalar @_ == 1) ? %{$_[0]} : @_;'; |
79 | |
5cf3dbcf |
80 | $source .= "\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
7a5b07b3 |
81 | |
82 | $source .= ";\n" . (join ";\n" => map { |
83 | $self->_generate_slot_initializer($_) |
5cf3dbcf |
84 | } 0 .. (@{$self->attributes} - 1)); |
7a5b07b3 |
85 | |
1b55c340 |
86 | $source .= ";\n" . $self->_generate_triggers(); |
5cf3dbcf |
87 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
88 | |
5cf3dbcf |
89 | $source .= ";\n" . 'return $instance'; |
7a5b07b3 |
90 | $source .= ";\n" . '}'; |
91 | warn $source if $self->options->{debug}; |
92 | |
5cf3dbcf |
93 | my $code; |
94 | { |
95 | # NOTE: |
96 | # create the nessecary lexicals |
7a5b07b3 |
97 | # to be picked up in the eval |
5cf3dbcf |
98 | my $attrs = $self->attributes; |
7a5b07b3 |
99 | |
475042d0 |
100 | # We need to check if the attribute ->can('type_constraint') |
101 | # since we may be trying to immutabilize a Moose meta class, |
102 | # which in turn has attributes which are Class::MOP::Attribute |
7701d0aa |
103 | # objects, rather than Moose::Meta::Attribute. And |
104 | # Class::MOP::Attribute attributes have no type constraints. |
238b424d |
105 | # However we need to make sure we leave an undef value there |
106 | # because the inlined code is using the index of the attributes |
107 | # to determine where to find the type constraint |
108 | |
109 | my @type_constraints = map { |
110 | $_->can('type_constraint') ? $_->type_constraint : undef |
111 | } @$attrs; |
112 | |
c9183ffc |
113 | my @type_constraint_bodies = map { |
238b424d |
114 | defined $_ ? $_->_compiled_type_constraint : undef; |
c9183ffc |
115 | } @type_constraints; |
7c4f0d32 |
116 | |
5cf3dbcf |
117 | $code = eval $source; |
118 | confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@; |
119 | } |
120 | $self->{'&!body'} = $code; |
121 | } |
122 | |
123 | sub _generate_BUILDALL { |
124 | my $self = shift; |
125 | my @BUILD_calls; |
1f779926 |
126 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
7a5b07b3 |
127 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD(\%params)'; |
5cf3dbcf |
128 | } |
7a5b07b3 |
129 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
130 | } |
131 | |
1b55c340 |
132 | sub _generate_triggers { |
133 | my $self = shift; |
134 | my @trigger_calls; |
135 | foreach my $i (0 .. $#{ $self->attributes }) { |
136 | my $attr = $self->attributes->[$i]; |
137 | if ($attr->can('has_trigger') && $attr->has_trigger) { |
138 | if (defined(my $init_arg = $attr->init_arg)) { |
139 | push @trigger_calls => ( |
140 | '(exists $params{\'' . $init_arg . '\'}) && do {' . "\n " |
141 | . '$attrs->[' . $i . ']->trigger->(' |
142 | . '$instance, ' |
143 | . $self->meta_instance->inline_get_slot_value( |
144 | '$instance', |
145 | ("'" . $attr->name . "'") |
146 | ) |
147 | . ', ' |
148 | . '$attrs->[' . $i . ']' |
149 | . ');' |
150 | ."\n}" |
151 | ); |
152 | } |
153 | } |
154 | } |
155 | return join ";\n" => @trigger_calls; |
156 | } |
157 | |
5cf3dbcf |
158 | sub _generate_slot_initializer { |
159 | my $self = shift; |
160 | my $index = shift; |
7a5b07b3 |
161 | |
5cf3dbcf |
162 | my $attr = $self->attributes->[$index]; |
7a5b07b3 |
163 | |
5cf3dbcf |
164 | my @source = ('## ' . $attr->name); |
d66bea3c |
165 | |
166 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
167 | |
84981146 |
168 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
7a5b07b3 |
169 | push @source => ('(exists $params{\'' . $attr->init_arg . '\'}) ' . |
5cf3dbcf |
170 | '|| confess "Attribute (' . $attr->name . ') is required";'); |
171 | } |
7a5b07b3 |
172 | |
ca168e89 |
173 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
174 | |
84981146 |
175 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
176 | push @source => 'if (exists $params{\'' . $init_arg . '\'}) {'; |
8ecb1fa0 |
177 | |
84981146 |
178 | push @source => ('my $val = $params{\'' . $init_arg . '\'};'); |
179 | |
180 | if ($is_moose && $attr->has_type_constraint) { |
181 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
182 | push @source => $self->_generate_type_coercion( |
183 | $attr, |
184 | '$type_constraints[' . $index . ']', |
185 | '$val', |
186 | '$val' |
187 | ); |
84981146 |
188 | } |
688fcdda |
189 | push @source => $self->_generate_type_constraint_check( |
190 | $attr, |
191 | '$type_constraint_bodies[' . $index . ']', |
192 | '$type_constraints[' . $index . ']', |
193 | '$val' |
194 | ); |
8ecb1fa0 |
195 | } |
9df136d0 |
196 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
197 | |
84981146 |
198 | push @source => "} else {"; |
199 | } |
ca168e89 |
200 | my $default; |
97e11ef5 |
201 | if ( $attr->has_default ) { |
ca168e89 |
202 | $default = $self->_generate_default_value($attr, $index); |
97e11ef5 |
203 | } |
204 | else { |
ca168e89 |
205 | my $builder = $attr->builder; |
206 | $default = '$instance->' . $builder; |
207 | } |
688fcdda |
208 | |
3db3ea82 |
209 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
210 | push @source => ('my $val = ' . $default . ';'); |
211 | push @source => $self->_generate_type_constraint_check( |
212 | $attr, |
c9183ffc |
213 | ('$type_constraint_bodies[' . $index . ']'), |
688fcdda |
214 | ('$type_constraints[' . $index . ']'), |
5cf3dbcf |
215 | '$val' |
7a5b07b3 |
216 | ) if ($is_moose && $attr->has_type_constraint); |
bad76b8e |
217 | |
51c107ef |
218 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
bad76b8e |
219 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
220 | |
84981146 |
221 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
222 | } |
84981146 |
223 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
224 | push @source => '(exists $params{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
225 | |
84981146 |
226 | push @source => ('my $val = $params{\'' . $init_arg . '\'};'); |
d66bea3c |
227 | if ($is_moose && $attr->has_type_constraint) { |
7a5b07b3 |
228 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
229 | push @source => $self->_generate_type_coercion( |
230 | $attr, |
231 | '$type_constraints[' . $index . ']', |
232 | '$val', |
233 | '$val' |
234 | ); |
8ecb1fa0 |
235 | } |
688fcdda |
236 | push @source => $self->_generate_type_constraint_check( |
237 | $attr, |
238 | '$type_constraint_bodies[' . $index . ']', |
239 | '$type_constraints[' . $index . ']', |
240 | '$val' |
241 | ); |
8ecb1fa0 |
242 | } |
9df136d0 |
243 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
244 | |
245 | push @source => "}"; |
5cf3dbcf |
246 | } |
7a5b07b3 |
247 | |
5cf3dbcf |
248 | return join "\n" => @source; |
249 | } |
250 | |
251 | sub _generate_slot_assignment { |
9df136d0 |
252 | my ($self, $attr, $value, $index) = @_; |
253 | |
254 | my $source; |
255 | |
256 | if ($attr->has_initializer) { |
257 | $source = ( |
258 | '$attrs->[' . $index . ']->set_initial_value($instance, ' . $value . ');' |
259 | ); |
260 | } |
261 | else { |
262 | $source = ( |
263 | $self->meta_instance->inline_set_slot_value( |
264 | '$instance', |
265 | ("'" . $attr->name . "'"), |
266 | $value |
267 | ) . ';' |
268 | ); |
269 | } |
270 | |
271 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
272 | |
d66bea3c |
273 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
274 | $source .= ( |
275 | "\n" . |
276 | $self->meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
277 | '$instance', |
5cf3dbcf |
278 | ("'" . $attr->name . "'") |
7a5b07b3 |
279 | ) . |
5cf3dbcf |
280 | ' if ref ' . $value . ';' |
7a5b07b3 |
281 | ); |
282 | } |
283 | |
5cf3dbcf |
284 | return $source; |
285 | } |
286 | |
287 | sub _generate_type_coercion { |
288 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
289 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
290 | } |
291 | |
292 | sub _generate_type_constraint_check { |
688fcdda |
293 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
294 | return ( |
c9183ffc |
295 | $type_constraint_cv . '->(' . $value_name . ')' |
688fcdda |
296 | . "\n\t" . '|| confess "Attribute (' |
297 | . $attr->name |
298 | . ') does not pass the type constraint because: " . ' |
299 | . $type_constraint_obj . '->get_message(' . $value_name . ');' |
7a5b07b3 |
300 | ); |
5cf3dbcf |
301 | } |
302 | |
303 | sub _generate_default_value { |
304 | my ($self, $attr, $index) = @_; |
305 | # NOTE: |
306 | # default values can either be CODE refs |
7a5b07b3 |
307 | # in which case we need to call them. Or |
5cf3dbcf |
308 | # they can be scalars (strings/numbers) |
309 | # in which case we can just deal with them |
310 | # in the code we eval. |
311 | if ($attr->is_default_a_coderef) { |
312 | return '$attrs->[' . $index . ']->default($instance)'; |
313 | } |
314 | else { |
315 | my $default = $attr->default; |
316 | # make sure to quote strings ... |
317 | unless (looks_like_number($default)) { |
318 | $default = "'$default'"; |
319 | } |
7a5b07b3 |
320 | |
5cf3dbcf |
321 | return $default; |
7a5b07b3 |
322 | } |
5cf3dbcf |
323 | } |
324 | |
325 | 1; |
326 | |
5cf3dbcf |
327 | __END__ |
328 | |
329 | =pod |
330 | |
7a5b07b3 |
331 | =head1 NAME |
5cf3dbcf |
332 | |
333 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
334 | |
5cf3dbcf |
335 | =head1 DESCRIPTION |
336 | |
7a5b07b3 |
337 | This is a subclass of L<Class::MOP::Method> which handles |
338 | constructing an approprate Constructor methods. This is primarily |
339 | used in the making of immutable metaclasses, otherwise it is |
d44714be |
340 | not particularly useful. |
341 | |
5cf3dbcf |
342 | =head1 METHODS |
343 | |
344 | =over 4 |
345 | |
346 | =item B<new> |
347 | |
348 | =item B<attributes> |
349 | |
350 | =item B<meta_instance> |
351 | |
352 | =item B<options> |
353 | |
415e6f85 |
354 | =item B<initialize_body> |
5cf3dbcf |
355 | |
356 | =item B<associated_metaclass> |
357 | |
358 | =back |
359 | |
360 | =head1 AUTHORS |
361 | |
362 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
363 | |
364 | =head1 COPYRIGHT AND LICENSE |
365 | |
778db3ac |
366 | Copyright 2006-2008 by Infinity Interactive, Inc. |
5cf3dbcf |
367 | |
368 | L<http://www.iinteractive.com> |
369 | |
370 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
371 | it under the same terms as Perl itself. |
5cf3dbcf |
372 | |
373 | =cut |
374 | |