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 | |
e606ae5f |
9 | our $VERSION = '0.57'; |
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 | |
7a5b07b3 |
50 | ## accessors |
5cf3dbcf |
51 | |
e606ae5f |
52 | sub options { (shift)->{'options'} } |
53 | sub meta_instance { (shift)->{'meta_instance'} } |
54 | sub attributes { (shift)->{'attributes'} } |
5cf3dbcf |
55 | |
e606ae5f |
56 | sub associated_metaclass { (shift)->{'associated_metaclass'} } |
5cf3dbcf |
57 | |
58 | ## method |
59 | |
384c126d |
60 | # this was changed in 0.41, but broke MooseX::Singleton, so try to catch |
61 | # any other code using the original broken spelling |
c245d69b |
62 | sub intialize_body { Moose->throw_error("Please correct the spelling of 'intialize_body' to 'initialize_body'") } |
384c126d |
63 | |
415e6f85 |
64 | sub initialize_body { |
5cf3dbcf |
65 | my $self = shift; |
66 | # TODO: |
7a5b07b3 |
67 | # the %options should also include a both |
68 | # a call 'initializer' and call 'SUPER::' |
69 | # options, which should cover approx 90% |
70 | # of the possible use cases (even if it |
71 | # requires some adaption on the part of |
5cf3dbcf |
72 | # the author, after all, nothing is free) |
73 | my $source = 'sub {'; |
1f779926 |
74 | $source .= "\n" . 'my $class = shift;'; |
7a5b07b3 |
75 | |
587ae0d2 |
76 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
7a5b07b3 |
77 | $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';'; |
78 | |
e606ae5f |
79 | $source .= "\n" . 'my $params = ' . $self->_generate_BUILDARGS('$class', '@_'); |
93e98578 |
80 | |
e606ae5f |
81 | $source .= ";\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
7a5b07b3 |
82 | |
83 | $source .= ";\n" . (join ";\n" => map { |
84 | $self->_generate_slot_initializer($_) |
5cf3dbcf |
85 | } 0 .. (@{$self->attributes} - 1)); |
7a5b07b3 |
86 | |
1b55c340 |
87 | $source .= ";\n" . $self->_generate_triggers(); |
5cf3dbcf |
88 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
89 | |
5cf3dbcf |
90 | $source .= ";\n" . 'return $instance'; |
7a5b07b3 |
91 | $source .= ";\n" . '}'; |
92 | warn $source if $self->options->{debug}; |
93 | |
5cf3dbcf |
94 | my $code; |
95 | { |
3e504337 |
96 | my $meta = $self; # FIXME for _inline_throw_error... |
97 | |
5cf3dbcf |
98 | # NOTE: |
99 | # create the nessecary lexicals |
7a5b07b3 |
100 | # to be picked up in the eval |
5cf3dbcf |
101 | my $attrs = $self->attributes; |
7a5b07b3 |
102 | |
475042d0 |
103 | # We need to check if the attribute ->can('type_constraint') |
104 | # since we may be trying to immutabilize a Moose meta class, |
105 | # which in turn has attributes which are Class::MOP::Attribute |
7701d0aa |
106 | # objects, rather than Moose::Meta::Attribute. And |
107 | # Class::MOP::Attribute attributes have no type constraints. |
238b424d |
108 | # However we need to make sure we leave an undef value there |
109 | # because the inlined code is using the index of the attributes |
110 | # to determine where to find the type constraint |
111 | |
112 | my @type_constraints = map { |
113 | $_->can('type_constraint') ? $_->type_constraint : undef |
114 | } @$attrs; |
115 | |
c9183ffc |
116 | my @type_constraint_bodies = map { |
238b424d |
117 | defined $_ ? $_->_compiled_type_constraint : undef; |
c9183ffc |
118 | } @type_constraints; |
7c4f0d32 |
119 | |
5cf3dbcf |
120 | $code = eval $source; |
3e504337 |
121 | $self->throw_error("Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@", error => $@, data => $source ) if $@; |
5cf3dbcf |
122 | } |
e606ae5f |
123 | $self->{'body'} = $code; |
124 | } |
125 | |
126 | sub _generate_BUILDARGS { |
127 | my ( $self, $class, $args ) = @_; |
128 | |
129 | my $buildargs = $self->associated_metaclass->find_method_by_name("BUILDARGS"); |
130 | |
131 | if ( $args eq '@_' and ( !$buildargs or $buildargs->body == \&Moose::Object::BUILDARGS ) ) { |
132 | return join("\n", |
133 | 'do {', |
134 | $self->_inline_throw_error('"Single parameters to new() must be a HASH ref"', 'data => $_[0]'), |
135 | ' if scalar @_ == 1 && defined $_[0] && ref($_[0]) ne q{HASH};', |
136 | '(scalar @_ == 1) ? {%{$_[0]}} : {@_};', |
137 | '}', |
138 | ); |
139 | } else { |
140 | return $class . "->BUILDARGS($args)"; |
141 | } |
5cf3dbcf |
142 | } |
143 | |
144 | sub _generate_BUILDALL { |
145 | my $self = shift; |
146 | my @BUILD_calls; |
1f779926 |
147 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
e606ae5f |
148 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD($params)'; |
5cf3dbcf |
149 | } |
7a5b07b3 |
150 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
151 | } |
152 | |
1b55c340 |
153 | sub _generate_triggers { |
154 | my $self = shift; |
155 | my @trigger_calls; |
156 | foreach my $i (0 .. $#{ $self->attributes }) { |
157 | my $attr = $self->attributes->[$i]; |
158 | if ($attr->can('has_trigger') && $attr->has_trigger) { |
159 | if (defined(my $init_arg = $attr->init_arg)) { |
160 | push @trigger_calls => ( |
e606ae5f |
161 | '(exists $params->{\'' . $init_arg . '\'}) && do {' . "\n " |
1b55c340 |
162 | . '$attrs->[' . $i . ']->trigger->(' |
163 | . '$instance, ' |
164 | . $self->meta_instance->inline_get_slot_value( |
165 | '$instance', |
166 | ("'" . $attr->name . "'") |
167 | ) |
168 | . ', ' |
169 | . '$attrs->[' . $i . ']' |
170 | . ');' |
171 | ."\n}" |
172 | ); |
173 | } |
174 | } |
175 | } |
176 | return join ";\n" => @trigger_calls; |
177 | } |
178 | |
5cf3dbcf |
179 | sub _generate_slot_initializer { |
180 | my $self = shift; |
181 | my $index = shift; |
7a5b07b3 |
182 | |
5cf3dbcf |
183 | my $attr = $self->attributes->[$index]; |
7a5b07b3 |
184 | |
5cf3dbcf |
185 | my @source = ('## ' . $attr->name); |
d66bea3c |
186 | |
187 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
188 | |
84981146 |
189 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
e606ae5f |
190 | push @source => ('(exists $params->{\'' . $attr->init_arg . '\'}) ' . |
3e504337 |
191 | '|| ' . $self->_inline_throw_error('"Attribute (' . $attr->name . ') is required"') .';'); |
5cf3dbcf |
192 | } |
7a5b07b3 |
193 | |
ca168e89 |
194 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
195 | |
84981146 |
196 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
197 | push @source => 'if (exists $params->{\'' . $init_arg . '\'}) {'; |
198 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
199 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
200 | if $is_moose; |
201 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
84981146 |
202 | push @source => "} else {"; |
203 | } |
ca168e89 |
204 | my $default; |
97e11ef5 |
205 | if ( $attr->has_default ) { |
ca168e89 |
206 | $default = $self->_generate_default_value($attr, $index); |
97e11ef5 |
207 | } |
208 | else { |
ca168e89 |
209 | my $builder = $attr->builder; |
210 | $default = '$instance->' . $builder; |
211 | } |
688fcdda |
212 | |
3db3ea82 |
213 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
214 | push @source => ('my $val = ' . $default . ';'); |
e606ae5f |
215 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
216 | if $is_moose; |
51c107ef |
217 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
bad76b8e |
218 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
219 | |
84981146 |
220 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
221 | } |
84981146 |
222 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
223 | push @source => '(exists $params->{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
224 | |
e606ae5f |
225 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
d66bea3c |
226 | if ($is_moose && $attr->has_type_constraint) { |
7a5b07b3 |
227 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
228 | push @source => $self->_generate_type_coercion( |
229 | $attr, |
230 | '$type_constraints[' . $index . ']', |
231 | '$val', |
232 | '$val' |
233 | ); |
8ecb1fa0 |
234 | } |
688fcdda |
235 | push @source => $self->_generate_type_constraint_check( |
236 | $attr, |
237 | '$type_constraint_bodies[' . $index . ']', |
238 | '$type_constraints[' . $index . ']', |
239 | '$val' |
240 | ); |
8ecb1fa0 |
241 | } |
9df136d0 |
242 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
243 | |
244 | push @source => "}"; |
5cf3dbcf |
245 | } |
7a5b07b3 |
246 | |
5cf3dbcf |
247 | return join "\n" => @source; |
248 | } |
249 | |
250 | sub _generate_slot_assignment { |
9df136d0 |
251 | my ($self, $attr, $value, $index) = @_; |
252 | |
253 | my $source; |
254 | |
255 | if ($attr->has_initializer) { |
256 | $source = ( |
257 | '$attrs->[' . $index . ']->set_initial_value($instance, ' . $value . ');' |
258 | ); |
259 | } |
260 | else { |
261 | $source = ( |
262 | $self->meta_instance->inline_set_slot_value( |
263 | '$instance', |
264 | ("'" . $attr->name . "'"), |
265 | $value |
266 | ) . ';' |
267 | ); |
268 | } |
269 | |
270 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
271 | |
d66bea3c |
272 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
273 | $source .= ( |
274 | "\n" . |
275 | $self->meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
276 | '$instance', |
5cf3dbcf |
277 | ("'" . $attr->name . "'") |
7a5b07b3 |
278 | ) . |
5cf3dbcf |
279 | ' if ref ' . $value . ';' |
7a5b07b3 |
280 | ); |
281 | } |
282 | |
5cf3dbcf |
283 | return $source; |
284 | } |
285 | |
e606ae5f |
286 | sub _generate_type_constraint_and_coercion { |
287 | my ($self, $attr, $index) = @_; |
288 | |
289 | return unless $attr->has_type_constraint; |
290 | |
291 | my @source; |
292 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
293 | push @source => $self->_generate_type_coercion( |
294 | $attr, |
295 | '$type_constraints[' . $index . ']', |
296 | '$val', |
297 | '$val' |
298 | ); |
299 | } |
300 | push @source => $self->_generate_type_constraint_check( |
301 | $attr, |
302 | ('$type_constraint_bodies[' . $index . ']'), |
303 | ('$type_constraints[' . $index . ']'), |
304 | '$val' |
305 | ); |
306 | return @source; |
307 | } |
308 | |
5cf3dbcf |
309 | sub _generate_type_coercion { |
310 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
311 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
312 | } |
313 | |
314 | sub _generate_type_constraint_check { |
688fcdda |
315 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
316 | return ( |
3e504337 |
317 | $self->_inline_throw_error('"Attribute (' # FIXME add 'dad' |
688fcdda |
318 | . $attr->name |
319 | . ') does not pass the type constraint because: " . ' |
3e504337 |
320 | . $type_constraint_obj . '->get_message(' . $value_name . ')') |
321 | . "\n\t unless " . $type_constraint_cv . '->(' . $value_name . ');' |
7a5b07b3 |
322 | ); |
5cf3dbcf |
323 | } |
324 | |
325 | sub _generate_default_value { |
326 | my ($self, $attr, $index) = @_; |
327 | # NOTE: |
328 | # default values can either be CODE refs |
7a5b07b3 |
329 | # in which case we need to call them. Or |
5cf3dbcf |
330 | # they can be scalars (strings/numbers) |
331 | # in which case we can just deal with them |
332 | # in the code we eval. |
333 | if ($attr->is_default_a_coderef) { |
334 | return '$attrs->[' . $index . ']->default($instance)'; |
335 | } |
336 | else { |
337 | my $default = $attr->default; |
338 | # make sure to quote strings ... |
339 | unless (looks_like_number($default)) { |
340 | $default = "'$default'"; |
341 | } |
7a5b07b3 |
342 | |
5cf3dbcf |
343 | return $default; |
7a5b07b3 |
344 | } |
5cf3dbcf |
345 | } |
346 | |
347 | 1; |
348 | |
5cf3dbcf |
349 | __END__ |
350 | |
351 | =pod |
352 | |
7a5b07b3 |
353 | =head1 NAME |
5cf3dbcf |
354 | |
355 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
356 | |
5cf3dbcf |
357 | =head1 DESCRIPTION |
358 | |
7a5b07b3 |
359 | This is a subclass of L<Class::MOP::Method> which handles |
360 | constructing an approprate Constructor methods. This is primarily |
361 | used in the making of immutable metaclasses, otherwise it is |
d44714be |
362 | not particularly useful. |
363 | |
5cf3dbcf |
364 | =head1 METHODS |
365 | |
366 | =over 4 |
367 | |
368 | =item B<new> |
369 | |
370 | =item B<attributes> |
371 | |
372 | =item B<meta_instance> |
373 | |
374 | =item B<options> |
375 | |
415e6f85 |
376 | =item B<initialize_body> |
5cf3dbcf |
377 | |
378 | =item B<associated_metaclass> |
379 | |
380 | =back |
381 | |
382 | =head1 AUTHORS |
383 | |
384 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
385 | |
386 | =head1 COPYRIGHT AND LICENSE |
387 | |
778db3ac |
388 | Copyright 2006-2008 by Infinity Interactive, Inc. |
5cf3dbcf |
389 | |
390 | L<http://www.iinteractive.com> |
391 | |
392 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
393 | it under the same terms as Perl itself. |
5cf3dbcf |
394 | |
395 | =cut |
396 | |