Commit | Line | Data |
5cf3dbcf |
1 | |
2 | package Moose::Meta::Method::Constructor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
0d922627 |
7 | use Carp (); |
0fa70d03 |
8 | use Scalar::Util 'blessed', 'weaken', 'looks_like_number', 'refaddr'; |
5cf3dbcf |
9 | |
efa728b4 |
10 | our $VERSION = '1.15'; |
5cf3dbcf |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
badb7e89 |
13 | use base 'Moose::Meta::Method', |
bc89e9b5 |
14 | 'Class::MOP::Method::Constructor'; |
5cf3dbcf |
15 | |
16 | sub new { |
17 | my $class = shift; |
18 | my %options = @_; |
7a5b07b3 |
19 | |
3e504337 |
20 | my $meta = $options{metaclass}; |
21 | |
22 | (ref $options{options} eq 'HASH') |
a9538ac9 |
23 | || $class->throw_error("You must pass a hash of options", data => $options{options}); |
7a5b07b3 |
24 | |
1b2aea39 |
25 | ($options{package_name} && $options{name}) |
a9538ac9 |
26 | || $class->throw_error("You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT"); |
1b2aea39 |
27 | |
5cf3dbcf |
28 | my $self = bless { |
d03bd989 |
29 | 'body' => undef, |
e606ae5f |
30 | 'package_name' => $options{package_name}, |
31 | 'name' => $options{name}, |
e606ae5f |
32 | 'options' => $options{options}, |
e606ae5f |
33 | 'associated_metaclass' => $meta, |
0fa70d03 |
34 | '_expected_method_class' => $options{_expected_method_class} || 'Moose::Object', |
5cf3dbcf |
35 | } => $class; |
36 | |
7a5b07b3 |
37 | # we don't want this creating |
38 | # a cycle in the code, if not |
5cf3dbcf |
39 | # needed |
e606ae5f |
40 | weaken($self->{'associated_metaclass'}); |
5cf3dbcf |
41 | |
f5b0af77 |
42 | $self->_initialize_body; |
5cf3dbcf |
43 | |
7a5b07b3 |
44 | return $self; |
5cf3dbcf |
45 | } |
46 | |
5cf3dbcf |
47 | ## method |
48 | |
f5b0af77 |
49 | sub _initialize_body { |
5cf3dbcf |
50 | my $self = shift; |
51 | # TODO: |
7a5b07b3 |
52 | # the %options should also include a both |
53 | # a call 'initializer' and call 'SUPER::' |
54 | # options, which should cover approx 90% |
55 | # of the possible use cases (even if it |
56 | # requires some adaption on the part of |
5cf3dbcf |
57 | # the author, after all, nothing is free) |
58 | my $source = 'sub {'; |
5d27ac73 |
59 | $source .= "\n" . 'my $_instance = shift;'; |
62c8675e |
60 | |
5d27ac73 |
61 | $source .= "\n" . 'my $class = Scalar::Util::blessed($_instance) || $_instance;'; |
7a5b07b3 |
62 | |
5117b888 |
63 | $source .= "\n" . "if (\$class ne '" . $self->associated_metaclass->name |
64 | . "') {"; |
65 | $source .= "\n return " |
66 | . $self->_generate_fallback_constructor('$class') . ";"; |
67 | $source .= "\n}\n"; |
93e98578 |
68 | |
ac070e13 |
69 | $source .= $self->_generate_params('$params', '$class'); |
70 | $source .= $self->_generate_instance('$instance', '$class'); |
71 | $source .= $self->_generate_slot_initializers; |
7a5b07b3 |
72 | |
ac070e13 |
73 | $source .= $self->_generate_triggers(); |
5cf3dbcf |
74 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
75 | |
ac070e13 |
76 | $source .= ";\nreturn \$instance"; |
7a5b07b3 |
77 | $source .= ";\n" . '}'; |
78 | warn $source if $self->options->{debug}; |
79 | |
5442a061 |
80 | # We need to check if the attribute ->can('type_constraint') |
81 | # since we may be trying to immutabilize a Moose meta class, |
82 | # which in turn has attributes which are Class::MOP::Attribute |
83 | # objects, rather than Moose::Meta::Attribute. And |
84 | # Class::MOP::Attribute attributes have no type constraints. |
85 | # However we need to make sure we leave an undef value there |
86 | # because the inlined code is using the index of the attributes |
87 | # to determine where to find the type constraint |
88 | |
0772362a |
89 | my $attrs = $self->_attributes; |
5442a061 |
90 | |
91 | my @type_constraints = map { |
92 | $_->can('type_constraint') ? $_->type_constraint : undef |
93 | } @$attrs; |
94 | |
95 | my @type_constraint_bodies = map { |
96 | defined $_ ? $_->_compiled_type_constraint : undef; |
97 | } @type_constraints; |
98 | |
47bfa72e |
99 | my $defaults = [map { $_->default } @$attrs]; |
100 | |
34aab661 |
101 | my ( $code, $e ) = $self->_compile_code( |
5442a061 |
102 | code => $source, |
103 | environment => { |
104 | '$meta' => \$self, |
105 | '$attrs' => \$attrs, |
47bfa72e |
106 | '$defaults' => \$defaults, |
5442a061 |
107 | '@type_constraints' => \@type_constraints, |
108 | '@type_constraint_bodies' => \@type_constraint_bodies, |
109 | }, |
34aab661 |
110 | ); |
111 | |
112 | $self->throw_error( |
113 | "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$e", |
114 | error => $e, data => $source ) |
115 | if $e; |
d03bd989 |
116 | |
e606ae5f |
117 | $self->{'body'} = $code; |
118 | } |
119 | |
5117b888 |
120 | sub _generate_fallback_constructor { |
121 | my ( $self, $class_var ) = @_; |
122 | "${class_var}->Moose::Object::new(\@_)"; |
123 | } |
124 | |
b905f0db |
125 | sub _generate_params { |
126 | my ( $self, $var, $class_var ) = @_; |
127 | "my $var = " . $self->_generate_BUILDARGS( $class_var, '@_' ) . ";\n"; |
128 | } |
129 | |
130 | sub _generate_instance { |
131 | my ( $self, $var, $class_var ) = @_; |
132 | "my $var = " |
b6b0bb17 |
133 | . $self->associated_metaclass->inline_create_instance($class_var) . ";\n"; |
b905f0db |
134 | } |
135 | |
136 | sub _generate_slot_initializers { |
137 | my ($self) = @_; |
138 | return (join ";\n" => map { |
139 | $self->_generate_slot_initializer($_) |
0772362a |
140 | } 0 .. (@{$self->_attributes} - 1)) . ";\n"; |
b905f0db |
141 | } |
142 | |
e606ae5f |
143 | sub _generate_BUILDARGS { |
144 | my ( $self, $class, $args ) = @_; |
145 | |
146 | my $buildargs = $self->associated_metaclass->find_method_by_name("BUILDARGS"); |
147 | |
0d922627 |
148 | if ( $args eq '@_' |
149 | and ( !$buildargs or $buildargs->body == \&Moose::Object::BUILDARGS ) |
150 | ) { |
151 | |
152 | # This is basically a copy of Moose::Object::BUILDARGS wrapped in a do |
153 | # {} block. |
154 | return sprintf( <<'EOF', $self->_inline_throw_error( q{'Single parameters to new() must be a HASH ref'}, 'data => $_[0]' ) ); |
155 | do { |
156 | if ( scalar @_ == 1 ) { |
157 | unless ( defined $_[0] && ref $_[0] eq 'HASH' ) { |
158 | %s |
159 | } |
160 | return { %%{ $_[0] } }; |
161 | } |
162 | elsif ( @_ %% 2 ) { |
163 | Carp::carp( |
164 | "The new() method for $class expects a hash reference or a key/value list." |
165 | . " You passed an odd number of arguments" ); |
166 | return { @_, undef }; |
167 | } |
168 | else { |
169 | return {@_}; |
170 | } |
171 | }; |
172 | EOF |
173 | ; |
174 | } |
175 | else { |
e606ae5f |
176 | return $class . "->BUILDARGS($args)"; |
177 | } |
5cf3dbcf |
178 | } |
179 | |
180 | sub _generate_BUILDALL { |
181 | my $self = shift; |
182 | my @BUILD_calls; |
1f779926 |
183 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
e606ae5f |
184 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD($params)'; |
5cf3dbcf |
185 | } |
7a5b07b3 |
186 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
187 | } |
188 | |
1b55c340 |
189 | sub _generate_triggers { |
190 | my $self = shift; |
191 | my @trigger_calls; |
0772362a |
192 | foreach my $i ( 0 .. $#{ $self->_attributes } ) { |
193 | my $attr = $self->_attributes->[$i]; |
708b4070 |
194 | |
195 | next unless $attr->can('has_trigger') && $attr->has_trigger; |
196 | |
197 | my $init_arg = $attr->init_arg; |
198 | |
199 | next unless defined $init_arg; |
200 | |
201 | push @trigger_calls => '(exists $params->{\'' |
202 | . $init_arg |
203 | . '\'}) && do {' |
204 | . "\n " |
205 | . '$attrs->[' |
206 | . $i |
207 | . ']->trigger->(' |
208 | . '$instance, ' |
b6b0bb17 |
209 | . $attr->inline_get('$instance') |
708b4070 |
210 | . ', ' |
c2685d20 |
211 | . ');' . "\n}"; |
1b55c340 |
212 | } |
708b4070 |
213 | |
214 | return join ";\n" => @trigger_calls; |
1b55c340 |
215 | } |
216 | |
5cf3dbcf |
217 | sub _generate_slot_initializer { |
218 | my $self = shift; |
219 | my $index = shift; |
7a5b07b3 |
220 | |
0772362a |
221 | my $attr = $self->_attributes->[$index]; |
7a5b07b3 |
222 | |
5cf3dbcf |
223 | my @source = ('## ' . $attr->name); |
d66bea3c |
224 | |
225 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
226 | |
84981146 |
227 | if ($is_moose && defined($attr->init_arg) && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
e606ae5f |
228 | push @source => ('(exists $params->{\'' . $attr->init_arg . '\'}) ' . |
95d922a2 |
229 | '|| ' . $self->_inline_throw_error('"Attribute (' . quotemeta($attr->name) . ') is required"') .';'); |
5cf3dbcf |
230 | } |
7a5b07b3 |
231 | |
ca168e89 |
232 | if (($attr->has_default || $attr->has_builder) && !($is_moose && $attr->is_lazy)) { |
7a5b07b3 |
233 | |
84981146 |
234 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
235 | push @source => 'if (exists $params->{\'' . $init_arg . '\'}) {'; |
236 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
237 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
238 | if $is_moose; |
239 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
84981146 |
240 | push @source => "} else {"; |
241 | } |
ca168e89 |
242 | my $default; |
97e11ef5 |
243 | if ( $attr->has_default ) { |
ca168e89 |
244 | $default = $self->_generate_default_value($attr, $index); |
d03bd989 |
245 | } |
97e11ef5 |
246 | else { |
ca168e89 |
247 | my $builder = $attr->builder; |
248 | $default = '$instance->' . $builder; |
249 | } |
d03bd989 |
250 | |
3db3ea82 |
251 | push @source => '{'; # wrap this to avoid my $val overwrite warnings |
5cf3dbcf |
252 | push @source => ('my $val = ' . $default . ';'); |
e606ae5f |
253 | push @source => $self->_generate_type_constraint_and_coercion($attr, $index) |
d03bd989 |
254 | if $is_moose; |
51c107ef |
255 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
d03bd989 |
256 | push @source => '}'; # close - wrap this to avoid my $val overrite warnings |
7a5b07b3 |
257 | |
84981146 |
258 | push @source => "}" if defined $attr->init_arg; |
7a5b07b3 |
259 | } |
84981146 |
260 | elsif ( defined( my $init_arg = $attr->init_arg ) ) { |
e606ae5f |
261 | push @source => '(exists $params->{\'' . $init_arg . '\'}) && do {'; |
8ecb1fa0 |
262 | |
e606ae5f |
263 | push @source => ('my $val = $params->{\'' . $init_arg . '\'};'); |
d66bea3c |
264 | if ($is_moose && $attr->has_type_constraint) { |
5aab256d |
265 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
688fcdda |
266 | push @source => $self->_generate_type_coercion( |
d03bd989 |
267 | $attr, |
268 | '$type_constraints[' . $index . ']', |
269 | '$val', |
688fcdda |
270 | '$val' |
271 | ); |
8ecb1fa0 |
272 | } |
688fcdda |
273 | push @source => $self->_generate_type_constraint_check( |
d03bd989 |
274 | $attr, |
275 | '$type_constraint_bodies[' . $index . ']', |
276 | '$type_constraints[' . $index . ']', |
688fcdda |
277 | '$val' |
278 | ); |
8ecb1fa0 |
279 | } |
9df136d0 |
280 | push @source => $self->_generate_slot_assignment($attr, '$val', $index); |
7a5b07b3 |
281 | |
282 | push @source => "}"; |
5cf3dbcf |
283 | } |
7a5b07b3 |
284 | |
5cf3dbcf |
285 | return join "\n" => @source; |
286 | } |
287 | |
288 | sub _generate_slot_assignment { |
9df136d0 |
289 | my ($self, $attr, $value, $index) = @_; |
290 | |
291 | my $source; |
d03bd989 |
292 | |
b6b0bb17 |
293 | if ( $attr->has_initializer ) { |
294 | return |
295 | '$attrs->[' |
296 | . $index |
297 | . ']->set_initial_value($instance, ' |
298 | . $value . ');'; |
9df136d0 |
299 | } |
300 | else { |
b6b0bb17 |
301 | return $attr->inline_set( |
302 | '$instance', |
303 | $value |
304 | ) . ';'; |
7a5b07b3 |
305 | } |
306 | |
5cf3dbcf |
307 | return $source; |
308 | } |
309 | |
e606ae5f |
310 | sub _generate_type_constraint_and_coercion { |
311 | my ($self, $attr, $index) = @_; |
d03bd989 |
312 | |
e606ae5f |
313 | return unless $attr->has_type_constraint; |
d03bd989 |
314 | |
e606ae5f |
315 | my @source; |
5aab256d |
316 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
e606ae5f |
317 | push @source => $self->_generate_type_coercion( |
318 | $attr, |
319 | '$type_constraints[' . $index . ']', |
320 | '$val', |
321 | '$val' |
322 | ); |
323 | } |
324 | push @source => $self->_generate_type_constraint_check( |
325 | $attr, |
326 | ('$type_constraint_bodies[' . $index . ']'), |
d03bd989 |
327 | ('$type_constraints[' . $index . ']'), |
e606ae5f |
328 | '$val' |
329 | ); |
330 | return @source; |
331 | } |
332 | |
5cf3dbcf |
333 | sub _generate_type_coercion { |
334 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
335 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
336 | } |
337 | |
338 | sub _generate_type_constraint_check { |
688fcdda |
339 | my ($self, $attr, $type_constraint_cv, $type_constraint_obj, $value_name) = @_; |
5cf3dbcf |
340 | return ( |
3e504337 |
341 | $self->_inline_throw_error('"Attribute (' # FIXME add 'dad' |
95d922a2 |
342 | . quotemeta( $attr->name ) |
d03bd989 |
343 | . ') does not pass the type constraint because: " . ' |
3e504337 |
344 | . $type_constraint_obj . '->get_message(' . $value_name . ')') |
345 | . "\n\t unless " . $type_constraint_cv . '->(' . $value_name . ');' |
7a5b07b3 |
346 | ); |
5cf3dbcf |
347 | } |
348 | |
5cf3dbcf |
349 | 1; |
350 | |
5cf3dbcf |
351 | __END__ |
352 | |
353 | =pod |
354 | |
7a5b07b3 |
355 | =head1 NAME |
5cf3dbcf |
356 | |
357 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
358 | |
5cf3dbcf |
359 | =head1 DESCRIPTION |
360 | |
cec39889 |
361 | This class is a subclass of L<Class::MOP::Method::Constructor> that |
cefc9e36 |
362 | provides additional Moose-specific functionality |
363 | |
364 | To understand this class, you should read the the |
cec39889 |
365 | L<Class::MOP::Method::Constructor> documentation as well. |
d44714be |
366 | |
bc89e9b5 |
367 | =head1 INHERITANCE |
368 | |
369 | C<Moose::Meta::Method::Constructor> is a subclass of |
370 | L<Moose::Meta::Method> I<and> L<Class::MOP::Method::Constructor>. |
371 | |
c5fc2c21 |
372 | =head1 BUGS |
373 | |
374 | See L<Moose/BUGS> for details on reporting bugs. |
375 | |
5cf3dbcf |
376 | =head1 AUTHORS |
377 | |
378 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
379 | |
380 | =head1 COPYRIGHT AND LICENSE |
381 | |
7e0492d3 |
382 | Copyright 2006-2010 by Infinity Interactive, Inc. |
5cf3dbcf |
383 | |
384 | L<http://www.iinteractive.com> |
385 | |
386 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
387 | it under the same terms as Perl itself. |
5cf3dbcf |
388 | |
389 | =cut |
390 | |