Commit | Line | Data |
5cf3dbcf |
1 | |
2 | package Moose::Meta::Method::Constructor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
5cf3dbcf |
7 | use Scalar::Util 'blessed', 'weaken', 'looks_like_number'; |
8 | |
82750a8a |
9 | our $VERSION = '0.62_01'; |
5cf3dbcf |
10 | our $AUTHORITY = 'cpan:STEVAN'; |
11 | |
badb7e89 |
12 | use base 'Moose::Meta::Method', |
13 | 'Class::MOP::Method::Generated'; |
5cf3dbcf |
14 | |
15 | sub new { |
16 | my $class = shift; |
17 | my %options = @_; |
7a5b07b3 |
18 | |
3e504337 |
19 | my $meta = $options{metaclass}; |
20 | |
21 | (ref $options{options} eq 'HASH') |
a9538ac9 |
22 | || $class->throw_error("You must pass a hash of options", data => $options{options}); |
7a5b07b3 |
23 | |
1b2aea39 |
24 | ($options{package_name} && $options{name}) |
a9538ac9 |
25 | || $class->throw_error("You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT"); |
1b2aea39 |
26 | |
5cf3dbcf |
27 | my $self = bless { |
28 | # from our superclass |
e606ae5f |
29 | 'body' => undef, |
30 | 'package_name' => $options{package_name}, |
31 | 'name' => $options{name}, |
5cf3dbcf |
32 | # specific to this subclass |
e606ae5f |
33 | 'options' => $options{options}, |
34 | 'meta_instance' => $meta->get_meta_instance, |
35 | 'attributes' => [ $meta->compute_all_applicable_attributes ], |
5cf3dbcf |
36 | # ... |
e606ae5f |
37 | 'associated_metaclass' => $meta, |
5cf3dbcf |
38 | } => $class; |
39 | |
7a5b07b3 |
40 | # we don't want this creating |
41 | # a cycle in the code, if not |
5cf3dbcf |
42 | # needed |
e606ae5f |
43 | weaken($self->{'associated_metaclass'}); |
5cf3dbcf |
44 | |
415e6f85 |
45 | $self->initialize_body; |
5cf3dbcf |
46 | |
7a5b07b3 |
47 | return $self; |
5cf3dbcf |
48 | } |
49 | |
308e04fa |
50 | sub can_be_inlined { |
51 | my $self = shift; |
52 | my $metaclass = $self->associated_metaclass; |
53 | |
db058da6 |
54 | my $class = $self->associated_metaclass->name; |
55 | |
12875d6e |
56 | # If any of our parents have been made immutable, we are okay to |
57 | # inline our own method as long as the parent's constructor class |
58 | # is the same as $self. |
59 | for my $meta ( grep { $_->is_immutable } |
60 | map { ( ref $metaclass )->initialize($_) } |
61 | $metaclass->linearized_isa ) { |
62 | my $transformer = $meta->get_immutable_transformer; |
63 | |
64 | my $constructor = $transformer->inlined_constructor |
65 | or next; |
66 | |
db058da6 |
67 | return 1 if ref $constructor eq ref $self; |
68 | |
69 | my $parent_name = $meta->name; |
70 | my $constructor_class = ref $constructor; |
71 | my $self_class = ref $self; |
72 | |
73 | # This case is fairly unlikely. In most normal cases, |
74 | # incompatibility between constructor classes will be caught |
75 | # by the code that fixes metaclass incompatibility in |
76 | # Moose::Meta::Class. However, if the parent passes a |
77 | # constructor_class directly to |
78 | # Parent->meta->make_immutable(), this could happen. |
79 | warn "Not inlining a constructor for $class. It has a parent class ($parent_name)" |
80 | . " which was inlined using $constructor_class, but $class is using $self_class\n"; |
81 | |
82 | return 0; |
12875d6e |
83 | } |
84 | |
308e04fa |
85 | if ( my $constructor = $metaclass->find_method_by_name( $self->name ) ) { |
86 | |
87 | my $expected_class = $self->_expected_constructor_class; |
88 | |
89 | if ( $constructor->body != $expected_class->can('new') ) { |
e94a703f |
90 | warn "Not inlining a constructor for $class since it is not" |
91 | . " inheriting the default $expected_class constructor\n"; |
308e04fa |
92 | |
93 | return 0; |
94 | } |
95 | else { |
96 | return 1; |
97 | } |
98 | } |
99 | |
100 | # This would be a rather weird case where we have no constructor |
101 | # in the inheritance chain. |
102 | return 1; |
103 | } |
104 | |
105 | # This is here so can_be_inlined can be inherited by MooseX modules. |
106 | sub _expected_constructor_class { |
107 | return 'Moose::Object'; |
108 | } |
109 | |
7a5b07b3 |
110 | ## accessors |
5cf3dbcf |
111 | |
e606ae5f |
112 | sub options { (shift)->{'options'} } |
113 | sub meta_instance { (shift)->{'meta_instance'} } |
114 | sub attributes { (shift)->{'attributes'} } |
5cf3dbcf |
115 | |
e606ae5f |
116 | sub associated_metaclass { (shift)->{'associated_metaclass'} } |
5cf3dbcf |
117 | |
118 | ## method |
119 | |
384c126d |
120 | # this was changed in 0.41, but broke MooseX::Singleton, so try to catch |
121 | # any other code using the original broken spelling |
c245d69b |
122 | sub intialize_body { Moose->throw_error("Please correct the spelling of 'intialize_body' to 'initialize_body'") } |
384c126d |
123 | |
415e6f85 |
124 | sub initialize_body { |
5cf3dbcf |
125 | my $self = shift; |
126 | # TODO: |
7a5b07b3 |
127 | # the %options should also include a both |
128 | # a call 'initializer' and call 'SUPER::' |
129 | # options, which should cover approx 90% |
130 | # of the possible use cases (even if it |
131 | # requires some adaption on the part of |
5cf3dbcf |
132 | # the author, after all, nothing is free) |
133 | my $source = 'sub {'; |
1f779926 |
134 | $source .= "\n" . 'my $class = shift;'; |
7a5b07b3 |
135 | |
587ae0d2 |
136 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
7a5b07b3 |
137 | $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';'; |
138 | |
e606ae5f |
139 | $source .= "\n" . 'my $params = ' . $self->_generate_BUILDARGS('$class', '@_'); |
93e98578 |
140 | |
e606ae5f |
141 | $source .= ";\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
7a5b07b3 |
142 | |
143 | $source .= ";\n" . (join ";\n" => map { |
144 | $self->_generate_slot_initializer($_) |
5cf3dbcf |
145 | } 0 .. (@{$self->attributes} - 1)); |
7a5b07b3 |
146 | |
1b55c340 |
147 | $source .= ";\n" . $self->_generate_triggers(); |
5cf3dbcf |
148 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
149 | |
5cf3dbcf |
150 | $source .= ";\n" . 'return $instance'; |
7a5b07b3 |
151 | $source .= ";\n" . '}'; |
152 | warn $source if $self->options->{debug}; |
153 | |
5cf3dbcf |
154 | my $code; |
155 | { |
3e504337 |
156 | my $meta = $self; # FIXME for _inline_throw_error... |
157 | |
5cf3dbcf |
158 | # NOTE: |
159 | # create the nessecary lexicals |
7a5b07b3 |
160 | # to be picked up in the eval |
5cf3dbcf |
161 | my $attrs = $self->attributes; |
7a5b07b3 |
162 | |
475042d0 |
163 | # We need to check if the attribute ->can('type_constraint') |
164 | # since we may be trying to immutabilize a Moose meta class, |
165 | # which in turn has attributes which are Class::MOP::Attribute |
7701d0aa |
166 | # objects, rather than Moose::Meta::Attribute. And |
167 | # Class::MOP::Attribute attributes have no type constraints. |
238b424d |
168 | # However we need to make sure we leave an undef value there |
169 | # because the inlined code is using the index of the attributes |
170 | # to determine where to find the type constraint |
171 | |
172 | my @type_constraints = map { |
173 | $_->can('type_constraint') ? $_->type_constraint : undef |
174 | } @$attrs; |
175 | |
c9183ffc |
176 | my @type_constraint_bodies = map { |
238b424d |
177 | defined $_ ? $_->_compiled_type_constraint : undef; |
c9183ffc |
178 | } @type_constraints; |
7c4f0d32 |
179 | |
5cf3dbcf |
180 | $code = eval $source; |
3e504337 |
181 | $self->throw_error("Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@", error => $@, data => $source ) if $@; |
5cf3dbcf |
182 | } |
e606ae5f |
183 | $self->{'body'} = $code; |
184 | } |
185 | |
186 | sub _generate_BUILDARGS { |
187 | my ( $self, $class, $args ) = @_; |
188 | |
189 | my $buildargs = $self->associated_metaclass->find_method_by_name("BUILDARGS"); |
190 | |
191 | if ( $args eq '@_' and ( !$buildargs or $buildargs->body == \&Moose::Object::BUILDARGS ) ) { |
192 | return join("\n", |
193 | 'do {', |
194 | $self->_inline_throw_error('"Single parameters to new() must be a HASH ref"', 'data => $_[0]'), |
195 | ' if scalar @_ == 1 && defined $_[0] && ref($_[0]) ne q{HASH};', |
196 | '(scalar @_ == 1) ? {%{$_[0]}} : {@_};', |
197 | '}', |
198 | ); |
199 | } else { |
200 | return $class . "->BUILDARGS($args)"; |
201 | } |
5cf3dbcf |
202 | } |
203 | |
204 | sub _generate_BUILDALL { |
205 | my $self = shift; |
206 | my @BUILD_calls; |
1f779926 |
207 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
e606ae5f |
208 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD($params)'; |
5cf3dbcf |
209 | } |
7a5b07b3 |
210 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
211 | } |
212 | |
1b55c340 |
213 | sub _generate_triggers { |
214 | my $self = shift; |
215 | my @trigger_calls; |
216 | foreach my $i (0 .. $#{ $self->attributes }) { |
217 | my $attr = $self->attributes->[$i]; |
218 | if ($attr->can('has_trigger') && $attr->has_trigger) { |
219 | if (defined(my $init_arg = $attr->init_arg)) { |
220 | push @trigger_calls => ( |
e606ae5f |
221 | '(exists $params->{\'' . $init_arg . '\'}) && do {' . "\n " |
1b55c340 |
222 | . '$attrs->[' . $i . ']->trigger->(' |
223 | . '$instance, ' |
224 | . $self->meta_instance->inline_get_slot_value( |
225 | '$instance', |
226 | ("'" . $attr->name . "'") |
227 | ) |
228 | . ', ' |
229 | . '$attrs->[' . $i . ']' |
230 | . ');' |
231 | ."\n}" |
232 | ); |
233 | } |
234 | } |
235 | } |
236 | return join ";\n" => @trigger_calls; |
237 | } |
238 | |
5cf3dbcf |
239 | sub _generate_slot_initializer { |
240 | my $self = shift; |
241 | my $index = shift; |
7a5b07b3 |
242 | |
5cf3dbcf |
243 | my $attr = $self->attributes->[$index]; |
7a5b07b3 |
244 | |
5cf3dbcf |
245 | my @source = ('## ' . $attr->name); |
d66bea3c |
246 | |
247 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
248 | |
84981146 |
249 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
e606ae5f |
250 | push @source => ('(exists $params->{\'' . $attr->init_arg . '\'}) ' . |
3e504337 |
251 | '|| ' . $self->_inline_throw_error('"Attribute (' . $attr->name . ') is required"') .';'); |
5cf3dbcf |
252 | } |
7a5b07b3 |
253 | |
ca168e89 |
254 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
255 | |
84981146 |
256 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
257 | push @source => 'if (exists $params->{\'' . $init_arg . '\'}) {'; |
258 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
259 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
260 | if $is_moose; |
261 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
84981146 |
262 | push @source => "} else {"; |
263 | } |
ca168e89 |
264 | my $default; |
97e11ef5 |
265 | if ( $attr->has_default ) { |
ca168e89 |
266 | $default = $self->_generate_default_value($attr, $index); |
97e11ef5 |
267 | } |
268 | else { |
ca168e89 |
269 | my $builder = $attr->builder; |
270 | $default = '$instance->' . $builder; |
271 | } |
688fcdda |
272 | |
3db3ea82 |
273 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
274 | push @source => ('my $val = ' . $default . ';'); |
e606ae5f |
275 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
276 | if $is_moose; |
51c107ef |
277 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
bad76b8e |
278 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
279 | |
84981146 |
280 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
281 | } |
84981146 |
282 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
283 | push @source => '(exists $params->{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
284 | |
e606ae5f |
285 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
d66bea3c |
286 | if ($is_moose && $attr->has_type_constraint) { |
7a5b07b3 |
287 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
288 | push @source => $self->_generate_type_coercion( |
289 | $attr, |
290 | '$type_constraints[' . $index . ']', |
291 | '$val', |
292 | '$val' |
293 | ); |
8ecb1fa0 |
294 | } |
688fcdda |
295 | push @source => $self->_generate_type_constraint_check( |
296 | $attr, |
297 | '$type_constraint_bodies[' . $index . ']', |
298 | '$type_constraints[' . $index . ']', |
299 | '$val' |
300 | ); |
8ecb1fa0 |
301 | } |
9df136d0 |
302 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
303 | |
304 | push @source => "}"; |
5cf3dbcf |
305 | } |
7a5b07b3 |
306 | |
5cf3dbcf |
307 | return join "\n" => @source; |
308 | } |
309 | |
310 | sub _generate_slot_assignment { |
9df136d0 |
311 | my ($self, $attr, $value, $index) = @_; |
312 | |
313 | my $source; |
314 | |
315 | if ($attr->has_initializer) { |
316 | $source = ( |
317 | '$attrs->[' . $index . ']->set_initial_value($instance, ' . $value . ');' |
318 | ); |
319 | } |
320 | else { |
321 | $source = ( |
322 | $self->meta_instance->inline_set_slot_value( |
323 | '$instance', |
324 | ("'" . $attr->name . "'"), |
325 | $value |
326 | ) . ';' |
327 | ); |
328 | } |
329 | |
330 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
331 | |
d66bea3c |
332 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
333 | $source .= ( |
334 | "\n" . |
335 | $self->meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
336 | '$instance', |
5cf3dbcf |
337 | ("'" . $attr->name . "'") |
7a5b07b3 |
338 | ) . |
5cf3dbcf |
339 | ' if ref ' . $value . ';' |
7a5b07b3 |
340 | ); |
341 | } |
342 | |
5cf3dbcf |
343 | return $source; |
344 | } |
345 | |
e606ae5f |
346 | sub _generate_type_constraint_and_coercion { |
347 | my ($self, $attr, $index) = @_; |
348 | |
349 | return unless $attr->has_type_constraint; |
350 | |
351 | my @source; |
352 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
353 | push @source => $self->_generate_type_coercion( |
354 | $attr, |
355 | '$type_constraints[' . $index . ']', |
356 | '$val', |
357 | '$val' |
358 | ); |
359 | } |
360 | push @source => $self->_generate_type_constraint_check( |
361 | $attr, |
362 | ('$type_constraint_bodies[' . $index . ']'), |
363 | ('$type_constraints[' . $index . ']'), |
364 | '$val' |
365 | ); |
366 | return @source; |
367 | } |
368 | |
5cf3dbcf |
369 | sub _generate_type_coercion { |
370 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
371 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
372 | } |
373 | |
374 | sub _generate_type_constraint_check { |
688fcdda |
375 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
376 | return ( |
3e504337 |
377 | $self->_inline_throw_error('"Attribute (' # FIXME add 'dad' |
688fcdda |
378 | . $attr->name |
379 | . ') does not pass the type constraint because: " . ' |
3e504337 |
380 | . $type_constraint_obj . '->get_message(' . $value_name . ')') |
381 | . "\n\t unless " . $type_constraint_cv . '->(' . $value_name . ');' |
7a5b07b3 |
382 | ); |
5cf3dbcf |
383 | } |
384 | |
385 | sub _generate_default_value { |
386 | my ($self, $attr, $index) = @_; |
387 | # NOTE: |
388 | # default values can either be CODE refs |
7a5b07b3 |
389 | # in which case we need to call them. Or |
5cf3dbcf |
390 | # they can be scalars (strings/numbers) |
391 | # in which case we can just deal with them |
392 | # in the code we eval. |
393 | if ($attr->is_default_a_coderef) { |
394 | return '$attrs->[' . $index . ']->default($instance)'; |
395 | } |
396 | else { |
397 | my $default = $attr->default; |
398 | # make sure to quote strings ... |
f3a93494 |
399 | return "'$default'"; |
400 | |
7a5b07b3 |
401 | } |
5cf3dbcf |
402 | } |
403 | |
404 | 1; |
405 | |
5cf3dbcf |
406 | __END__ |
407 | |
408 | =pod |
409 | |
7a5b07b3 |
410 | =head1 NAME |
5cf3dbcf |
411 | |
412 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
413 | |
5cf3dbcf |
414 | =head1 DESCRIPTION |
415 | |
7a5b07b3 |
416 | This is a subclass of L<Class::MOP::Method> which handles |
417 | constructing an approprate Constructor methods. This is primarily |
418 | used in the making of immutable metaclasses, otherwise it is |
d44714be |
419 | not particularly useful. |
420 | |
5cf3dbcf |
421 | =head1 METHODS |
422 | |
423 | =over 4 |
424 | |
425 | =item B<new> |
426 | |
427 | =item B<attributes> |
428 | |
429 | =item B<meta_instance> |
430 | |
431 | =item B<options> |
432 | |
415e6f85 |
433 | =item B<initialize_body> |
5cf3dbcf |
434 | |
435 | =item B<associated_metaclass> |
436 | |
437 | =back |
438 | |
439 | =head1 AUTHORS |
440 | |
441 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
442 | |
443 | =head1 COPYRIGHT AND LICENSE |
444 | |
778db3ac |
445 | Copyright 2006-2008 by Infinity Interactive, Inc. |
5cf3dbcf |
446 | |
447 | L<http://www.iinteractive.com> |
448 | |
449 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
450 | it under the same terms as Perl itself. |
5cf3dbcf |
451 | |
452 | =cut |
453 | |