Commit | Line | Data |
5cf3dbcf |
1 | |
2 | package Moose::Meta::Method::Constructor; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed', 'weaken', 'looks_like_number'; |
9 | |
18ea2bcc |
10 | our $VERSION = '0.02'; |
5cf3dbcf |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
13 | use base 'Moose::Meta::Method'; |
14 | |
15 | sub new { |
16 | my $class = shift; |
17 | my %options = @_; |
7a5b07b3 |
18 | |
5cf3dbcf |
19 | (exists $options{options} && ref $options{options} eq 'HASH') |
7a5b07b3 |
20 | || confess "You must pass a hash of options"; |
21 | |
5cf3dbcf |
22 | my $self = bless { |
23 | # from our superclass |
24 | '&!body' => undef, |
25 | # specific to this subclass |
26 | '%!options' => $options{options}, |
587ae0d2 |
27 | '$!meta_instance' => $options{metaclass}->get_meta_instance, |
7a5b07b3 |
28 | '@!attributes' => [ $options{metaclass}->compute_all_applicable_attributes ], |
5cf3dbcf |
29 | # ... |
30 | '$!associated_metaclass' => $options{metaclass}, |
31 | } => $class; |
32 | |
7a5b07b3 |
33 | # we don't want this creating |
34 | # a cycle in the code, if not |
5cf3dbcf |
35 | # needed |
7a5b07b3 |
36 | weaken($self->{'$!associated_metaclass'}); |
5cf3dbcf |
37 | |
38 | $self->intialize_body; |
39 | |
7a5b07b3 |
40 | return $self; |
5cf3dbcf |
41 | } |
42 | |
7a5b07b3 |
43 | ## accessors |
5cf3dbcf |
44 | |
45 | sub options { (shift)->{'%!options'} } |
46 | sub meta_instance { (shift)->{'$!meta_instance'} } |
47 | sub attributes { (shift)->{'@!attributes'} } |
48 | |
49 | sub associated_metaclass { (shift)->{'$!associated_metaclass'} } |
50 | |
51 | ## method |
52 | |
53 | sub intialize_body { |
54 | my $self = shift; |
55 | # TODO: |
7a5b07b3 |
56 | # the %options should also include a both |
57 | # a call 'initializer' and call 'SUPER::' |
58 | # options, which should cover approx 90% |
59 | # of the possible use cases (even if it |
60 | # requires some adaption on the part of |
5cf3dbcf |
61 | # the author, after all, nothing is free) |
62 | my $source = 'sub {'; |
1f779926 |
63 | $source .= "\n" . 'my $class = shift;'; |
7a5b07b3 |
64 | |
587ae0d2 |
65 | $source .= "\n" . 'return $class->Moose::Object::new(@_)'; |
7a5b07b3 |
66 | $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';'; |
67 | |
68 | $source .= "\n" . 'my %params = (scalar @_ == 1) ? %{$_[0]} : @_;'; |
69 | |
5cf3dbcf |
70 | $source .= "\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
7a5b07b3 |
71 | |
72 | $source .= ";\n" . (join ";\n" => map { |
73 | $self->_generate_slot_initializer($_) |
5cf3dbcf |
74 | } 0 .. (@{$self->attributes} - 1)); |
7a5b07b3 |
75 | |
5cf3dbcf |
76 | $source .= ";\n" . $self->_generate_BUILDALL(); |
7a5b07b3 |
77 | |
5cf3dbcf |
78 | $source .= ";\n" . 'return $instance'; |
7a5b07b3 |
79 | $source .= ";\n" . '}'; |
80 | warn $source if $self->options->{debug}; |
81 | |
5cf3dbcf |
82 | my $code; |
83 | { |
84 | # NOTE: |
85 | # create the nessecary lexicals |
7a5b07b3 |
86 | # to be picked up in the eval |
5cf3dbcf |
87 | my $attrs = $self->attributes; |
7a5b07b3 |
88 | |
5cf3dbcf |
89 | $code = eval $source; |
90 | confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@; |
91 | } |
92 | $self->{'&!body'} = $code; |
93 | } |
94 | |
95 | sub _generate_BUILDALL { |
96 | my $self = shift; |
97 | my @BUILD_calls; |
1f779926 |
98 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
7a5b07b3 |
99 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD(\%params)'; |
5cf3dbcf |
100 | } |
7a5b07b3 |
101 | return join ";\n" => @BUILD_calls; |
5cf3dbcf |
102 | } |
103 | |
104 | sub _generate_slot_initializer { |
105 | my $self = shift; |
106 | my $index = shift; |
7a5b07b3 |
107 | |
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108 | my $attr = $self->attributes->[$index]; |
7a5b07b3 |
109 | |
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110 | my @source = ('## ' . $attr->name); |
d66bea3c |
111 | |
112 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
113 | |
114 | if ($is_moose && $attr->is_required && !$attr->has_default && !$attr->has_builder) { |
115 | push @source => ('(exists $params{\'' . $attr->init_arg . '\'}) ' . |
5cf3dbcf |
116 | '|| confess "Attribute (' . $attr->name . ') is required";'); |
117 | } |
7a5b07b3 |
118 | |
d66bea3c |
119 | if ($attr->has_default && !($is_moose &&$attr->is_lazy)) { |
7a5b07b3 |
120 | |
8ecb1fa0 |
121 | push @source => 'if (exists $params{\'' . $attr->init_arg . '\'}) {'; |
122 | |
123 | push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};'); |
d66bea3c |
124 | if ($is_moose && $attr->has_type_constraint) { |
8ecb1fa0 |
125 | push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;'); |
126 | |
7a5b07b3 |
127 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
128 | push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val'); |
8ecb1fa0 |
129 | } |
7a5b07b3 |
130 | push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val'); |
8ecb1fa0 |
131 | } |
7a5b07b3 |
132 | push @source => $self->_generate_slot_assignment($attr, '$val'); |
133 | |
134 | |
135 | push @source => "} else {"; |
136 | |
137 | my $default = $self->_generate_default_value($attr, $index); |
138 | |
5cf3dbcf |
139 | push @source => ('my $val = ' . $default . ';'); |
140 | push @source => $self->_generate_type_constraint_check( |
141 | $attr, |
7a5b07b3 |
142 | ('$attrs->[' . $index . ']->type_constraint'), |
5cf3dbcf |
143 | '$val' |
7a5b07b3 |
144 | ) if ($is_moose && $attr->has_type_constraint); |
145 | push @source => $self->_generate_slot_assignment($attr, $default); |
146 | |
147 | push @source => "}"; |
148 | } |
5cf3dbcf |
149 | else { |
8ecb1fa0 |
150 | push @source => '(exists $params{\'' . $attr->init_arg . '\'}) && do {'; |
151 | |
152 | push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};'); |
d66bea3c |
153 | if ($is_moose && $attr->has_type_constraint) { |
8ecb1fa0 |
154 | push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;'); |
155 | |
7a5b07b3 |
156 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
157 | push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val'); |
8ecb1fa0 |
158 | } |
7a5b07b3 |
159 | push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val'); |
8ecb1fa0 |
160 | } |
7a5b07b3 |
161 | push @source => $self->_generate_slot_assignment($attr, '$val'); |
162 | |
163 | push @source => "}"; |
5cf3dbcf |
164 | } |
7a5b07b3 |
165 | |
5cf3dbcf |
166 | return join "\n" => @source; |
167 | } |
168 | |
169 | sub _generate_slot_assignment { |
170 | my ($self, $attr, $value) = @_; |
171 | my $source = ( |
172 | $self->meta_instance->inline_set_slot_value( |
7a5b07b3 |
173 | '$instance', |
174 | ("'" . $attr->name . "'"), |
5cf3dbcf |
175 | $value |
176 | ) . ';' |
7a5b07b3 |
177 | ); |
d66bea3c |
178 | |
179 | my $is_moose = $attr->isa('Moose::Meta::Attribute'); # XXX FIXME |
7a5b07b3 |
180 | |
d66bea3c |
181 | if ($is_moose && $attr->is_weak_ref) { |
5cf3dbcf |
182 | $source .= ( |
183 | "\n" . |
184 | $self->meta_instance->inline_weaken_slot_value( |
7a5b07b3 |
185 | '$instance', |
5cf3dbcf |
186 | ("'" . $attr->name . "'") |
7a5b07b3 |
187 | ) . |
5cf3dbcf |
188 | ' if ref ' . $value . ';' |
7a5b07b3 |
189 | ); |
190 | } |
191 | |
5cf3dbcf |
192 | return $source; |
193 | } |
194 | |
195 | sub _generate_type_coercion { |
196 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
197 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
198 | } |
199 | |
200 | sub _generate_type_constraint_check { |
201 | my ($self, $attr, $type_constraint_name, $value_name) = @_; |
202 | return ( |
203 | 'defined(' . $type_constraint_name . '->_compiled_type_constraint->(' . $value_name . '))' |
7a5b07b3 |
204 | . "\n\t" . '|| confess "Attribute (' . $attr->name . ') does not pass the type constraint (' |
205 | . $attr->type_constraint->name |
8ac5969a |
206 | . ') with " . (defined(' . $value_name . ') ? (Scalar::Util::blessed(' . $value_name . ') && overload::Overloaded(' . $value_name . ') ? overload::StrVal(' . $value_name . ') : ' . $value_name . ') : "undef");' |
7a5b07b3 |
207 | ); |
5cf3dbcf |
208 | } |
209 | |
210 | sub _generate_default_value { |
211 | my ($self, $attr, $index) = @_; |
212 | # NOTE: |
213 | # default values can either be CODE refs |
7a5b07b3 |
214 | # in which case we need to call them. Or |
5cf3dbcf |
215 | # they can be scalars (strings/numbers) |
216 | # in which case we can just deal with them |
217 | # in the code we eval. |
218 | if ($attr->is_default_a_coderef) { |
219 | return '$attrs->[' . $index . ']->default($instance)'; |
220 | } |
221 | else { |
222 | my $default = $attr->default; |
223 | # make sure to quote strings ... |
224 | unless (looks_like_number($default)) { |
225 | $default = "'$default'"; |
226 | } |
7a5b07b3 |
227 | |
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228 | return $default; |
7a5b07b3 |
229 | } |
5cf3dbcf |
230 | } |
231 | |
232 | 1; |
233 | |
5cf3dbcf |
234 | __END__ |
235 | |
236 | =pod |
237 | |
7a5b07b3 |
238 | =head1 NAME |
5cf3dbcf |
239 | |
240 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
241 | |
5cf3dbcf |
242 | =head1 DESCRIPTION |
243 | |
7a5b07b3 |
244 | This is a subclass of L<Class::MOP::Method> which handles |
245 | constructing an approprate Constructor methods. This is primarily |
246 | used in the making of immutable metaclasses, otherwise it is |
d44714be |
247 | not particularly useful. |
248 | |
5cf3dbcf |
249 | =head1 METHODS |
250 | |
251 | =over 4 |
252 | |
253 | =item B<new> |
254 | |
255 | =item B<attributes> |
256 | |
257 | =item B<meta_instance> |
258 | |
259 | =item B<options> |
260 | |
261 | =item B<intialize_body> |
262 | |
263 | =item B<associated_metaclass> |
264 | |
265 | =back |
266 | |
267 | =head1 AUTHORS |
268 | |
269 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
270 | |
271 | =head1 COPYRIGHT AND LICENSE |
272 | |
b77fdbed |
273 | Copyright 2006, 2007 by Infinity Interactive, Inc. |
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274 | |
275 | L<http://www.iinteractive.com> |
276 | |
277 | This library is free software; you can redistribute it and/or modify |
7a5b07b3 |
278 | it under the same terms as Perl itself. |
5cf3dbcf |
279 | |
280 | =cut |
281 | |