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 | |
baf46b9e |
9 | our $VERSION = '0.72_01'; |
5cf3dbcf |
10 | our $AUTHORITY = 'cpan:STEVAN'; |
11 | |
badb7e89 |
12 | use base 'Moose::Meta::Method', |
bc89e9b5 |
13 | 'Class::MOP::Method::Constructor'; |
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 | |
5d826cfa |
54 | my $expected_class = $self->_expected_constructor_class; |
55 | |
12875d6e |
56 | # If any of our parents have been made immutable, we are okay to |
e4c7477b |
57 | # inline our own new method. The assumption is that an inlined new |
58 | # method provided by a parent does not actually get used by |
59 | # children anyway. |
60 | for my $meta ( |
61 | grep { $_->is_immutable } |
62 | map { ( ref $metaclass )->initialize($_) } |
5d826cfa |
63 | grep { $_ ne $expected_class } |
e4c7477b |
64 | $metaclass->linearized_isa |
65 | ) { |
70695d9c |
66 | my $transformer = $meta->immutable_transformer; |
12875d6e |
67 | |
5d826cfa |
68 | # This is actually a false positive if we're in a subclass of |
69 | # this class, _and_ the expected class is not overridden (but |
70 | # should be), and the real expected class is actually |
71 | # immutable itself (see Fey::Object::Table for an example of |
72 | # how this can happen). I'm not sure how to actually handle |
73 | # that case, since it's effectively a bug in the subclass (for |
74 | # not overriding _expected_constructor_class). |
e4c7477b |
75 | return 1 if $transformer->inlined_constructor; |
12875d6e |
76 | } |
77 | |
308e04fa |
78 | if ( my $constructor = $metaclass->find_method_by_name( $self->name ) ) { |
e4c7477b |
79 | my $class = $self->associated_metaclass->name; |
308e04fa |
80 | |
81 | if ( $constructor->body != $expected_class->can('new') ) { |
81766020 |
82 | my $warning |
83 | = "Not inlining a constructor for $class since it is not" |
37236439 |
84 | . " inheriting the default $expected_class constructor\n" |
85 | . "If you are certain you don't need to inline your" |
86 | . " constructor, specify inline_constructor => 0 in your" |
87 | . " call to $class->meta->make_immutable\n"; |
308e04fa |
88 | |
81766020 |
89 | $warning .= " (constructor has method modifiers which would be lost if it were inlined)\n" |
90 | if $constructor->isa('Class::MOP::Method::Wrapped'); |
91 | |
92 | warn $warning; |
93 | |
308e04fa |
94 | return 0; |
95 | } |
96 | else { |
97 | return 1; |
98 | } |
99 | } |
100 | |
101 | # This would be a rather weird case where we have no constructor |
102 | # in the inheritance chain. |
103 | return 1; |
104 | } |
105 | |
106 | # This is here so can_be_inlined can be inherited by MooseX modules. |
107 | sub _expected_constructor_class { |
108 | return 'Moose::Object'; |
109 | } |
110 | |
7a5b07b3 |
111 | ## accessors |
5cf3dbcf |
112 | |
e606ae5f |
113 | sub meta_instance { (shift)->{'meta_instance'} } |
114 | sub attributes { (shift)->{'attributes'} } |
5cf3dbcf |
115 | |
5cf3dbcf |
116 | ## method |
117 | |
ac070e13 |
118 | sub _generate_params { |
119 | my ($self, $var, $class_var) = @_; |
120 | "my $var = " . $self->_generate_BUILDARGS($class_var, '@_') . ";\n"; |
121 | } |
122 | |
123 | sub _generate_instance { |
124 | my ($self, $var, $class_var) = @_; |
125 | "my $var = " . $self->meta_instance->inline_create_instance($class_var) |
126 | . ";\n"; |
127 | } |
128 | |
129 | sub _generate_slot_initializers { |
130 | my ($self) = @_; |
131 | return (join ";\n" => map { |
132 | $self->_generate_slot_initializer($_) |
133 | } 0 .. (@{$self->attributes} - 1)) . ";\n"; |
134 | } |
135 | |
415e6f85 |
136 | sub initialize_body { |
5cf3dbcf |
137 | my $self = shift; |
138 | # TODO: |
7a5b07b3 |
139 | # the %options should also include a both |
140 | # a call 'initializer' and call 'SUPER::' |
141 | # options, which should cover approx 90% |
142 | # of the possible use cases (even if it |
143 | # requires some adaption on the part of |
5cf3dbcf |
144 | # the author, after all, nothing is free) |
145 | my $source = 'sub {'; |
1f779926 |
146 | $source .= "\n" . 'my $class = shift;'; |
7a5b07b3 |
147 | |
587ae0d2 |
148 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
ac070e13 |
149 | $source .= "\n if \$class ne '" . $self->associated_metaclass->name |
150 | . "';\n"; |
93e98578 |
151 | |
ac070e13 |
152 | $source .= $self->_generate_params('$params', '$class'); |
153 | $source .= $self->_generate_instance('$instance', '$class'); |
154 | $source .= $self->_generate_slot_initializers; |
7a5b07b3 |
155 | |
ac070e13 |
156 | $source .= $self->_generate_triggers(); |
5cf3dbcf |
157 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
158 | |
ac070e13 |
159 | $source .= ";\nreturn \$instance"; |
7a5b07b3 |
160 | $source .= ";\n" . '}'; |
161 | warn $source if $self->options->{debug}; |
162 | |
5442a061 |
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 |
166 | # objects, rather than Moose::Meta::Attribute. And |
167 | # Class::MOP::Attribute attributes have no type constraints. |
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 $attrs = $self->attributes; |
173 | |
174 | my @type_constraints = map { |
175 | $_->can('type_constraint') ? $_->type_constraint : undef |
176 | } @$attrs; |
177 | |
178 | my @type_constraint_bodies = map { |
179 | defined $_ ? $_->_compiled_type_constraint : undef; |
180 | } @type_constraints; |
181 | |
182 | my $code = $self->_compile_code( |
183 | code => $source, |
184 | environment => { |
185 | '$meta' => \$self, |
186 | '$attrs' => \$attrs, |
187 | '@type_constraints' => \@type_constraints, |
188 | '@type_constraint_bodies' => \@type_constraint_bodies, |
189 | }, |
190 | ) or $self->throw_error("Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@", error => $@, data => $source ); |
a62dcd43 |
191 | |
e606ae5f |
192 | $self->{'body'} = $code; |
193 | } |
194 | |
195 | sub _generate_BUILDARGS { |
196 | my ( $self, $class, $args ) = @_; |
197 | |
198 | my $buildargs = $self->associated_metaclass->find_method_by_name("BUILDARGS"); |
199 | |
200 | if ( $args eq '@_' and ( !$buildargs or $buildargs->body == \&Moose::Object::BUILDARGS ) ) { |
201 | return join("\n", |
202 | 'do {', |
203 | $self->_inline_throw_error('"Single parameters to new() must be a HASH ref"', 'data => $_[0]'), |
a62dcd43 |
204 | ' if scalar @_ == 1 && !( defined $_[0] && ref $_[0] eq q{HASH} );', |
e606ae5f |
205 | '(scalar @_ == 1) ? {%{$_[0]}} : {@_};', |
206 | '}', |
207 | ); |
208 | } else { |
209 | return $class . "->BUILDARGS($args)"; |
210 | } |
5cf3dbcf |
211 | } |
212 | |
213 | sub _generate_BUILDALL { |
214 | my $self = shift; |
215 | my @BUILD_calls; |
1f779926 |
216 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
e606ae5f |
217 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD($params)'; |
5cf3dbcf |
218 | } |
7a5b07b3 |
219 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
220 | } |
221 | |
1b55c340 |
222 | sub _generate_triggers { |
223 | my $self = shift; |
224 | my @trigger_calls; |
708b4070 |
225 | foreach my $i ( 0 .. $#{ $self->attributes } ) { |
1b55c340 |
226 | my $attr = $self->attributes->[$i]; |
708b4070 |
227 | |
228 | next unless $attr->can('has_trigger') && $attr->has_trigger; |
229 | |
230 | my $init_arg = $attr->init_arg; |
231 | |
232 | next unless defined $init_arg; |
233 | |
234 | push @trigger_calls => '(exists $params->{\'' |
235 | . $init_arg |
236 | . '\'}) && do {' |
237 | . "\n " |
238 | . '$attrs->[' |
239 | . $i |
240 | . ']->trigger->(' |
241 | . '$instance, ' |
242 | . $self->meta_instance->inline_get_slot_value( |
243 | '$instance', |
244 | $attr->name, |
245 | ) |
246 | . ', ' |
247 | . '$attrs->[' |
248 | . $i . ']' . ');' . "\n}"; |
1b55c340 |
249 | } |
708b4070 |
250 | |
251 | return join ";\n" => @trigger_calls; |
1b55c340 |
252 | } |
253 | |
5cf3dbcf |
254 | sub _generate_slot_initializer { |
255 | my $self = shift; |
256 | my $index = shift; |
7a5b07b3 |
257 | |
5cf3dbcf |
258 | my $attr = $self->attributes->[$index]; |
7a5b07b3 |
259 | |
5cf3dbcf |
260 | my @source = ('## ' . $attr->name); |
d66bea3c |
261 | |
262 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
263 | |
84981146 |
264 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
e606ae5f |
265 | push @source => ('(exists $params->{\'' . $attr->init_arg . '\'}) ' . |
3e504337 |
266 | '|| ' . $self->_inline_throw_error('"Attribute (' . $attr->name . ') is required"') .';'); |
5cf3dbcf |
267 | } |
7a5b07b3 |
268 | |
ca168e89 |
269 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
270 | |
84981146 |
271 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
272 | push @source => 'if (exists $params->{\'' . $init_arg . '\'}) {'; |
273 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
274 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
275 | if $is_moose; |
276 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
84981146 |
277 | push @source => "} else {"; |
278 | } |
ca168e89 |
279 | my $default; |
97e11ef5 |
280 | if ( $attr->has_default ) { |
ca168e89 |
281 | $default = $self->_generate_default_value($attr, $index); |
97e11ef5 |
282 | } |
283 | else { |
ca168e89 |
284 | my $builder = $attr->builder; |
285 | $default = '$instance->' . $builder; |
286 | } |
688fcdda |
287 | |
3db3ea82 |
288 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
289 | push @source => ('my $val = ' . $default . ';'); |
e606ae5f |
290 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
291 | if $is_moose; |
51c107ef |
292 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
bad76b8e |
293 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
294 | |
84981146 |
295 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
296 | } |
84981146 |
297 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
298 | push @source => '(exists $params->{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
299 | |
e606ae5f |
300 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
d66bea3c |
301 | if ($is_moose && $attr->has_type_constraint) { |
7a5b07b3 |
302 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
303 | push @source => $self->_generate_type_coercion( |
304 | $attr, |
305 | '$type_constraints[' . $index . ']', |
306 | '$val', |
307 | '$val' |
308 | ); |
8ecb1fa0 |
309 | } |
688fcdda |
310 | push @source => $self->_generate_type_constraint_check( |
311 | $attr, |
312 | '$type_constraint_bodies[' . $index . ']', |
313 | '$type_constraints[' . $index . ']', |
314 | '$val' |
315 | ); |
8ecb1fa0 |
316 | } |
9df136d0 |
317 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
318 | |
319 | push @source => "}"; |
5cf3dbcf |
320 | } |
7a5b07b3 |
321 | |
5cf3dbcf |
322 | return join "\n" => @source; |
323 | } |
324 | |
325 | sub _generate_slot_assignment { |
9df136d0 |
326 | my ($self, $attr, $value, $index) = @_; |
327 | |
328 | my $source; |
329 | |
330 | if ($attr->has_initializer) { |
331 | $source = ( |
332 | '$attrs->[' . $index . ']->set_initial_value($instance, ' . $value . ');' |
333 | ); |
334 | } |
335 | else { |
336 | $source = ( |
337 | $self->meta_instance->inline_set_slot_value( |
338 | '$instance', |
eae37c67 |
339 | $attr->name, |
9df136d0 |
340 | $value |
341 | ) . ';' |
342 | ); |
343 | } |
344 | |
345 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
346 | |
d66bea3c |
347 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
348 | $source .= ( |
349 | "\n" . |
350 | $self->meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
351 | '$instance', |
eae37c67 |
352 | $attr->name |
7a5b07b3 |
353 | ) . |
5cf3dbcf |
354 | ' if ref ' . $value . ';' |
7a5b07b3 |
355 | ); |
356 | } |
357 | |
5cf3dbcf |
358 | return $source; |
359 | } |
360 | |
e606ae5f |
361 | sub _generate_type_constraint_and_coercion { |
362 | my ($self, $attr, $index) = @_; |
363 | |
364 | return unless $attr->has_type_constraint; |
365 | |
366 | my @source; |
367 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
368 | push @source => $self->_generate_type_coercion( |
369 | $attr, |
370 | '$type_constraints[' . $index . ']', |
371 | '$val', |
372 | '$val' |
373 | ); |
374 | } |
375 | push @source => $self->_generate_type_constraint_check( |
376 | $attr, |
377 | ('$type_constraint_bodies[' . $index . ']'), |
378 | ('$type_constraints[' . $index . ']'), |
379 | '$val' |
380 | ); |
381 | return @source; |
382 | } |
383 | |
5cf3dbcf |
384 | sub _generate_type_coercion { |
385 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
386 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
387 | } |
388 | |
389 | sub _generate_type_constraint_check { |
688fcdda |
390 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
391 | return ( |
3e504337 |
392 | $self->_inline_throw_error('"Attribute (' # FIXME add 'dad' |
688fcdda |
393 | . $attr->name |
394 | . ') does not pass the type constraint because: " . ' |
3e504337 |
395 | . $type_constraint_obj . '->get_message(' . $value_name . ')') |
396 | . "\n\t unless " . $type_constraint_cv . '->(' . $value_name . ');' |
7a5b07b3 |
397 | ); |
5cf3dbcf |
398 | } |
399 | |
400 | sub _generate_default_value { |
401 | my ($self, $attr, $index) = @_; |
402 | # NOTE: |
403 | # default values can either be CODE refs |
7a5b07b3 |
404 | # in which case we need to call them. Or |
5cf3dbcf |
405 | # they can be scalars (strings/numbers) |
406 | # in which case we can just deal with them |
407 | # in the code we eval. |
408 | if ($attr->is_default_a_coderef) { |
409 | return '$attrs->[' . $index . ']->default($instance)'; |
410 | } |
411 | else { |
4aa3d405 |
412 | return q{"} . quotemeta( $attr->default ) . q{"}; |
7a5b07b3 |
413 | } |
5cf3dbcf |
414 | } |
415 | |
416 | 1; |
417 | |
5cf3dbcf |
418 | __END__ |
419 | |
420 | =pod |
421 | |
7a5b07b3 |
422 | =head1 NAME |
5cf3dbcf |
423 | |
424 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
425 | |
5cf3dbcf |
426 | =head1 DESCRIPTION |
427 | |
cefc9e36 |
428 | This class is a subclass of L<Class::MOP::Class::Constructor> that |
429 | provides additional Moose-specific functionality |
430 | |
431 | To understand this class, you should read the the |
432 | L<Class::MOP::Class::Constructor> documentation as well. |
d44714be |
433 | |
bc89e9b5 |
434 | =head1 INHERITANCE |
435 | |
436 | C<Moose::Meta::Method::Constructor> is a subclass of |
437 | L<Moose::Meta::Method> I<and> L<Class::MOP::Method::Constructor>. |
438 | |
5cf3dbcf |
439 | =head1 METHODS |
440 | |
441 | =over 4 |
442 | |
cefc9e36 |
443 | =item B<< $metamethod->can_be_inlined >> |
a1257460 |
444 | |
cefc9e36 |
445 | This returns true if the method can inlined. |
5cf3dbcf |
446 | |
cefc9e36 |
447 | First, it looks at all of the parents of the associated class. If any |
448 | of them have an inlined constructor, then the constructor can be |
449 | inlined. |
5cf3dbcf |
450 | |
cefc9e36 |
451 | If none of them have been inlined, it checks to make sure that the |
452 | pre-inlining constructor for the class matches the constructor from |
453 | the expected class. |
5cf3dbcf |
454 | |
cefc9e36 |
455 | By default, it expects this constructor come from L<Moose::Object>, |
456 | but subclasses can change this expectation. |
5cf3dbcf |
457 | |
cefc9e36 |
458 | If the constructor cannot be inlined it warns that this is the case. |
5cf3dbcf |
459 | |
460 | =back |
461 | |
462 | =head1 AUTHORS |
463 | |
464 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
465 | |
466 | =head1 COPYRIGHT AND LICENSE |
467 | |
2840a3b2 |
468 | Copyright 2006-2009 by Infinity Interactive, Inc. |
5cf3dbcf |
469 | |
470 | L<http://www.iinteractive.com> |
471 | |
472 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
473 | it under the same terms as Perl itself. |
5cf3dbcf |
474 | |
475 | =cut |
476 | |