Commit | Line | Data |
5cf3dbcf |
1 | |
2 | package Moose::Meta::Method::Constructor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
0fa70d03 |
7 | use Scalar::Util 'blessed', 'weaken', 'looks_like_number', 'refaddr'; |
5cf3dbcf |
8 | |
6e56c6e0 |
9 | our $VERSION = '0.89_02'; |
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 { |
d03bd989 |
28 | 'body' => undef, |
e606ae5f |
29 | 'package_name' => $options{package_name}, |
30 | 'name' => $options{name}, |
e606ae5f |
31 | 'options' => $options{options}, |
e606ae5f |
32 | 'associated_metaclass' => $meta, |
0fa70d03 |
33 | '_expected_method_class' => $options{_expected_method_class} || 'Moose::Object', |
5cf3dbcf |
34 | } => $class; |
35 | |
7a5b07b3 |
36 | # we don't want this creating |
37 | # a cycle in the code, if not |
5cf3dbcf |
38 | # needed |
e606ae5f |
39 | weaken($self->{'associated_metaclass'}); |
5cf3dbcf |
40 | |
f5b0af77 |
41 | $self->_initialize_body; |
5cf3dbcf |
42 | |
7a5b07b3 |
43 | return $self; |
5cf3dbcf |
44 | } |
45 | |
5cf3dbcf |
46 | ## method |
47 | |
f5b0af77 |
48 | sub _initialize_body { |
5cf3dbcf |
49 | my $self = shift; |
50 | # TODO: |
7a5b07b3 |
51 | # the %options should also include a both |
52 | # a call 'initializer' and call 'SUPER::' |
53 | # options, which should cover approx 90% |
54 | # of the possible use cases (even if it |
55 | # requires some adaption on the part of |
5cf3dbcf |
56 | # the author, after all, nothing is free) |
57 | my $source = 'sub {'; |
5d27ac73 |
58 | $source .= "\n" . 'my $_instance = shift;'; |
59 | $source .= "\n" . 'my $class = Scalar::Util::blessed($_instance) || $_instance;'; |
7a5b07b3 |
60 | |
587ae0d2 |
61 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
d03bd989 |
62 | $source .= "\n if \$class ne '" . $self->associated_metaclass->name |
ac070e13 |
63 | . "';\n"; |
93e98578 |
64 | |
ac070e13 |
65 | $source .= $self->_generate_params('$params', '$class'); |
66 | $source .= $self->_generate_instance('$instance', '$class'); |
67 | $source .= $self->_generate_slot_initializers; |
7a5b07b3 |
68 | |
ac070e13 |
69 | $source .= $self->_generate_triggers(); |
5cf3dbcf |
70 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
71 | |
ac070e13 |
72 | $source .= ";\nreturn \$instance"; |
7a5b07b3 |
73 | $source .= ";\n" . '}'; |
74 | warn $source if $self->options->{debug}; |
75 | |
5442a061 |
76 | # We need to check if the attribute ->can('type_constraint') |
77 | # since we may be trying to immutabilize a Moose meta class, |
78 | # which in turn has attributes which are Class::MOP::Attribute |
79 | # objects, rather than Moose::Meta::Attribute. And |
80 | # Class::MOP::Attribute attributes have no type constraints. |
81 | # However we need to make sure we leave an undef value there |
82 | # because the inlined code is using the index of the attributes |
83 | # to determine where to find the type constraint |
84 | |
0772362a |
85 | my $attrs = $self->_attributes; |
5442a061 |
86 | |
87 | my @type_constraints = map { |
88 | $_->can('type_constraint') ? $_->type_constraint : undef |
89 | } @$attrs; |
90 | |
91 | my @type_constraint_bodies = map { |
92 | defined $_ ? $_->_compiled_type_constraint : undef; |
93 | } @type_constraints; |
94 | |
34aab661 |
95 | my ( $code, $e ) = $self->_compile_code( |
5442a061 |
96 | code => $source, |
97 | environment => { |
98 | '$meta' => \$self, |
99 | '$attrs' => \$attrs, |
100 | '@type_constraints' => \@type_constraints, |
101 | '@type_constraint_bodies' => \@type_constraint_bodies, |
102 | }, |
34aab661 |
103 | ); |
104 | |
105 | $self->throw_error( |
106 | "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$e", |
107 | error => $e, data => $source ) |
108 | if $e; |
d03bd989 |
109 | |
e606ae5f |
110 | $self->{'body'} = $code; |
111 | } |
112 | |
b905f0db |
113 | sub _generate_params { |
114 | my ( $self, $var, $class_var ) = @_; |
115 | "my $var = " . $self->_generate_BUILDARGS( $class_var, '@_' ) . ";\n"; |
116 | } |
117 | |
118 | sub _generate_instance { |
119 | my ( $self, $var, $class_var ) = @_; |
120 | "my $var = " |
0772362a |
121 | . $self->_meta_instance->inline_create_instance($class_var) . ";\n"; |
b905f0db |
122 | } |
123 | |
124 | sub _generate_slot_initializers { |
125 | my ($self) = @_; |
126 | return (join ";\n" => map { |
127 | $self->_generate_slot_initializer($_) |
0772362a |
128 | } 0 .. (@{$self->_attributes} - 1)) . ";\n"; |
b905f0db |
129 | } |
130 | |
e606ae5f |
131 | sub _generate_BUILDARGS { |
132 | my ( $self, $class, $args ) = @_; |
133 | |
134 | my $buildargs = $self->associated_metaclass->find_method_by_name("BUILDARGS"); |
135 | |
136 | if ( $args eq '@_' and ( !$buildargs or $buildargs->body == \&Moose::Object::BUILDARGS ) ) { |
137 | return join("\n", |
138 | 'do {', |
139 | $self->_inline_throw_error('"Single parameters to new() must be a HASH ref"', 'data => $_[0]'), |
a62dcd43 |
140 | ' if scalar @_ == 1 && !( defined $_[0] && ref $_[0] eq q{HASH} );', |
e606ae5f |
141 | '(scalar @_ == 1) ? {%{$_[0]}} : {@_};', |
142 | '}', |
143 | ); |
144 | } else { |
145 | return $class . "->BUILDARGS($args)"; |
146 | } |
5cf3dbcf |
147 | } |
148 | |
149 | sub _generate_BUILDALL { |
150 | my $self = shift; |
151 | my @BUILD_calls; |
1f779926 |
152 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
e606ae5f |
153 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD($params)'; |
5cf3dbcf |
154 | } |
7a5b07b3 |
155 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
156 | } |
157 | |
1b55c340 |
158 | sub _generate_triggers { |
159 | my $self = shift; |
160 | my @trigger_calls; |
0772362a |
161 | foreach my $i ( 0 .. $#{ $self->_attributes } ) { |
162 | my $attr = $self->_attributes->[$i]; |
708b4070 |
163 | |
164 | next unless $attr->can('has_trigger') && $attr->has_trigger; |
165 | |
166 | my $init_arg = $attr->init_arg; |
167 | |
168 | next unless defined $init_arg; |
169 | |
170 | push @trigger_calls => '(exists $params->{\'' |
171 | . $init_arg |
172 | . '\'}) && do {' |
173 | . "\n " |
174 | . '$attrs->[' |
175 | . $i |
176 | . ']->trigger->(' |
177 | . '$instance, ' |
0772362a |
178 | . $self->_meta_instance->inline_get_slot_value( |
708b4070 |
179 | '$instance', |
180 | $attr->name, |
181 | ) |
182 | . ', ' |
c2685d20 |
183 | . ');' . "\n}"; |
1b55c340 |
184 | } |
708b4070 |
185 | |
186 | return join ";\n" => @trigger_calls; |
1b55c340 |
187 | } |
188 | |
5cf3dbcf |
189 | sub _generate_slot_initializer { |
190 | my $self = shift; |
191 | my $index = shift; |
7a5b07b3 |
192 | |
0772362a |
193 | my $attr = $self->_attributes->[$index]; |
7a5b07b3 |
194 | |
5cf3dbcf |
195 | my @source = ('## ' . $attr->name); |
d66bea3c |
196 | |
197 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
198 | |
84981146 |
199 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
e606ae5f |
200 | push @source => ('(exists $params->{\'' . $attr->init_arg . '\'}) ' . |
3e504337 |
201 | '|| ' . $self->_inline_throw_error('"Attribute (' . $attr->name . ') is required"') .';'); |
5cf3dbcf |
202 | } |
7a5b07b3 |
203 | |
ca168e89 |
204 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
205 | |
84981146 |
206 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
207 | push @source => 'if (exists $params->{\'' . $init_arg . '\'}) {'; |
208 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
209 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
210 | if $is_moose; |
211 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
84981146 |
212 | push @source => "} else {"; |
213 | } |
ca168e89 |
214 | my $default; |
97e11ef5 |
215 | if ( $attr->has_default ) { |
ca168e89 |
216 | $default = $self->_generate_default_value($attr, $index); |
d03bd989 |
217 | } |
97e11ef5 |
218 | else { |
ca168e89 |
219 | my $builder = $attr->builder; |
220 | $default = '$instance->' . $builder; |
221 | } |
d03bd989 |
222 | |
3db3ea82 |
223 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
224 | push @source => ('my $val = ' . $default . ';'); |
e606ae5f |
225 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
d03bd989 |
226 | if $is_moose; |
51c107ef |
227 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
d03bd989 |
228 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
229 | |
84981146 |
230 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
231 | } |
84981146 |
232 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
233 | push @source => '(exists $params->{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
234 | |
e606ae5f |
235 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
d66bea3c |
236 | if ($is_moose && $attr->has_type_constraint) { |
7a5b07b3 |
237 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
238 | push @source => $self->_generate_type_coercion( |
d03bd989 |
239 | $attr, |
240 | '$type_constraints[' . $index . ']', |
241 | '$val', |
688fcdda |
242 | '$val' |
243 | ); |
8ecb1fa0 |
244 | } |
688fcdda |
245 | push @source => $self->_generate_type_constraint_check( |
d03bd989 |
246 | $attr, |
247 | '$type_constraint_bodies[' . $index . ']', |
248 | '$type_constraints[' . $index . ']', |
688fcdda |
249 | '$val' |
250 | ); |
8ecb1fa0 |
251 | } |
9df136d0 |
252 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
253 | |
254 | push @source => "}"; |
5cf3dbcf |
255 | } |
7a5b07b3 |
256 | |
5cf3dbcf |
257 | return join "\n" => @source; |
258 | } |
259 | |
260 | sub _generate_slot_assignment { |
9df136d0 |
261 | my ($self, $attr, $value, $index) = @_; |
262 | |
263 | my $source; |
d03bd989 |
264 | |
9df136d0 |
265 | if ($attr->has_initializer) { |
266 | $source = ( |
267 | '$attrs->[' . $index . ']->set_initial_value($instance, ' . $value . ');' |
d03bd989 |
268 | ); |
9df136d0 |
269 | } |
270 | else { |
271 | $source = ( |
0772362a |
272 | $self->_meta_instance->inline_set_slot_value( |
9df136d0 |
273 | '$instance', |
eae37c67 |
274 | $attr->name, |
9df136d0 |
275 | $value |
276 | ) . ';' |
d03bd989 |
277 | ); |
9df136d0 |
278 | } |
d03bd989 |
279 | |
280 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
281 | |
d66bea3c |
282 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
283 | $source .= ( |
284 | "\n" . |
0772362a |
285 | $self->_meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
286 | '$instance', |
eae37c67 |
287 | $attr->name |
7a5b07b3 |
288 | ) . |
5cf3dbcf |
289 | ' if ref ' . $value . ';' |
7a5b07b3 |
290 | ); |
291 | } |
292 | |
5cf3dbcf |
293 | return $source; |
294 | } |
295 | |
e606ae5f |
296 | sub _generate_type_constraint_and_coercion { |
297 | my ($self, $attr, $index) = @_; |
d03bd989 |
298 | |
e606ae5f |
299 | return unless $attr->has_type_constraint; |
d03bd989 |
300 | |
e606ae5f |
301 | my @source; |
302 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
303 | push @source => $self->_generate_type_coercion( |
304 | $attr, |
305 | '$type_constraints[' . $index . ']', |
306 | '$val', |
307 | '$val' |
308 | ); |
309 | } |
310 | push @source => $self->_generate_type_constraint_check( |
311 | $attr, |
312 | ('$type_constraint_bodies[' . $index . ']'), |
d03bd989 |
313 | ('$type_constraints[' . $index . ']'), |
e606ae5f |
314 | '$val' |
315 | ); |
316 | return @source; |
317 | } |
318 | |
5cf3dbcf |
319 | sub _generate_type_coercion { |
320 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
321 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
322 | } |
323 | |
324 | sub _generate_type_constraint_check { |
688fcdda |
325 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
326 | return ( |
3e504337 |
327 | $self->_inline_throw_error('"Attribute (' # FIXME add 'dad' |
d03bd989 |
328 | . $attr->name |
329 | . ') does not pass the type constraint because: " . ' |
3e504337 |
330 | . $type_constraint_obj . '->get_message(' . $value_name . ')') |
331 | . "\n\t unless " . $type_constraint_cv . '->(' . $value_name . ');' |
7a5b07b3 |
332 | ); |
5cf3dbcf |
333 | } |
334 | |
335 | sub _generate_default_value { |
336 | my ($self, $attr, $index) = @_; |
337 | # NOTE: |
338 | # default values can either be CODE refs |
7a5b07b3 |
339 | # in which case we need to call them. Or |
5cf3dbcf |
340 | # they can be scalars (strings/numbers) |
341 | # in which case we can just deal with them |
342 | # in the code we eval. |
343 | if ($attr->is_default_a_coderef) { |
344 | return '$attrs->[' . $index . ']->default($instance)'; |
345 | } |
346 | else { |
4aa3d405 |
347 | return q{"} . quotemeta( $attr->default ) . q{"}; |
7a5b07b3 |
348 | } |
5cf3dbcf |
349 | } |
350 | |
351 | 1; |
352 | |
5cf3dbcf |
353 | __END__ |
354 | |
355 | =pod |
356 | |
7a5b07b3 |
357 | =head1 NAME |
5cf3dbcf |
358 | |
359 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
360 | |
5cf3dbcf |
361 | =head1 DESCRIPTION |
362 | |
cefc9e36 |
363 | This class is a subclass of L<Class::MOP::Class::Constructor> that |
364 | provides additional Moose-specific functionality |
365 | |
366 | To understand this class, you should read the the |
367 | L<Class::MOP::Class::Constructor> documentation as well. |
d44714be |
368 | |
bc89e9b5 |
369 | =head1 INHERITANCE |
370 | |
371 | C<Moose::Meta::Method::Constructor> is a subclass of |
372 | L<Moose::Meta::Method> I<and> L<Class::MOP::Method::Constructor>. |
373 | |
5cf3dbcf |
374 | =head1 AUTHORS |
375 | |
376 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
377 | |
378 | =head1 COPYRIGHT AND LICENSE |
379 | |
2840a3b2 |
380 | Copyright 2006-2009 by Infinity Interactive, Inc. |
5cf3dbcf |
381 | |
382 | L<http://www.iinteractive.com> |
383 | |
384 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
385 | it under the same terms as Perl itself. |
5cf3dbcf |
386 | |
387 | =cut |
388 | |