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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 | |
10 | our $VERSION = '0.01'; |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
13 | use base 'Moose::Meta::Method'; |
14 | |
15 | sub new { |
16 | my $class = shift; |
17 | my %options = @_; |
18 | |
19 | (exists $options{options} && ref $options{options} eq 'HASH') |
20 | || confess "You must pass a hash of options"; |
21 | |
22 | (blessed $options{meta_instance} && $options{meta_instance}->isa('Class::MOP::Instance')) |
23 | || confess "You must supply a meta-instance"; |
24 | |
25 | (exists $options{attributes} && ref $options{attributes} eq 'ARRAY') |
26 | || confess "You must pass an array of options"; |
27 | |
28 | (blessed($_) && $_->isa('Class::MOP::Attribute')) |
29 | || confess "You must supply a list of attributes which is a 'Class::MOP::Attribute' instance" |
30 | for @{$options{attributes}}; |
31 | |
32 | my $self = bless { |
33 | # from our superclass |
34 | '&!body' => undef, |
35 | # specific to this subclass |
36 | '%!options' => $options{options}, |
37 | '$!meta_instance' => $options{meta_instance}, |
38 | '@!attributes' => $options{attributes}, |
39 | # ... |
40 | '$!associated_metaclass' => $options{metaclass}, |
41 | } => $class; |
42 | |
43 | # we don't want this creating |
44 | # a cycle in the code, if not |
45 | # needed |
46 | weaken($self->{'$!meta_instance'}); |
47 | weaken($self->{'$!associated_metaclass'}); |
48 | |
49 | $self->intialize_body; |
50 | |
51 | return $self; |
52 | } |
53 | |
54 | ## accessors |
55 | |
56 | sub options { (shift)->{'%!options'} } |
57 | sub meta_instance { (shift)->{'$!meta_instance'} } |
58 | sub attributes { (shift)->{'@!attributes'} } |
59 | |
60 | sub associated_metaclass { (shift)->{'$!associated_metaclass'} } |
61 | |
62 | ## method |
63 | |
64 | sub intialize_body { |
65 | my $self = shift; |
66 | # TODO: |
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 |
72 | # the author, after all, nothing is free) |
73 | my $source = 'sub {'; |
1f779926 |
74 | $source .= "\n" . 'my $class = shift;'; |
75 | |
76 | $source .= "\n" . 'return $class->Moose::Object::' . $self->options->{constructor_name} . '(@_)'; |
77 | $source .= "\n" . ' if $class ne \'' . $self->associated_metaclass->name . '\';'; |
78 | |
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79 | $source .= "\n" . 'my %params = (scalar @_ == 1) ? %{$_[0]} : @_;'; |
80 | |
81 | $source .= "\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
82 | |
83 | $source .= ";\n" . (join ";\n" => map { |
84 | $self->_generate_slot_initializer($_) |
85 | } 0 .. (@{$self->attributes} - 1)); |
86 | |
87 | $source .= ";\n" . $self->_generate_BUILDALL(); |
88 | |
89 | $source .= ";\n" . 'return $instance'; |
90 | $source .= ";\n" . '}'; |
91 | warn $source if $self->options->{debug}; |
92 | |
93 | my $code; |
94 | { |
95 | # NOTE: |
96 | # create the nessecary lexicals |
97 | # to be picked up in the eval |
98 | my $attrs = $self->attributes; |
99 | |
100 | $code = eval $source; |
101 | confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@; |
102 | } |
103 | $self->{'&!body'} = $code; |
104 | } |
105 | |
106 | sub _generate_BUILDALL { |
107 | my $self = shift; |
108 | my @BUILD_calls; |
1f779926 |
109 | foreach my $method (reverse $self->associated_metaclass->find_all_methods_by_name('BUILD')) { |
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110 | push @BUILD_calls => '$instance->' . $method->{class} . '::BUILD(\%params)'; |
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111 | } |
112 | return join "\n" => @BUILD_calls; |
113 | } |
114 | |
115 | sub _generate_slot_initializer { |
116 | my $self = shift; |
117 | my $index = shift; |
118 | |
119 | my $attr = $self->attributes->[$index]; |
120 | |
121 | my @source = ('## ' . $attr->name); |
122 | |
123 | if ($attr->is_required && !$attr->has_default) { |
124 | push @source => ('(exists $params{\'' . $attr->init_arg . '\'}) ' . |
125 | '|| confess "Attribute (' . $attr->name . ') is required";'); |
126 | } |
127 | |
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128 | if ($attr->has_default && !$attr->is_lazy) { |
129 | |
8ecb1fa0 |
130 | push @source => 'if (exists $params{\'' . $attr->init_arg . '\'}) {'; |
131 | |
132 | push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};'); |
133 | if ($attr->has_type_constraint) { |
134 | push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;'); |
135 | |
136 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
137 | push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val'); |
138 | } |
139 | push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val'); |
140 | } |
141 | push @source => $self->_generate_slot_assignment($attr, '$val'); |
142 | |
143 | |
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144 | push @source => "} else {"; |
145 | |
146 | my $default = $self->_generate_default_value($attr, $index); |
147 | |
148 | push @source => ('my $val = ' . $default . ';'); |
149 | push @source => $self->_generate_type_constraint_check( |
150 | $attr, |
151 | ('$attrs->[' . $index . ']->type_constraint'), |
152 | '$val' |
153 | ) if $attr->has_type_constraint; |
154 | push @source => $self->_generate_slot_assignment($attr, $default); |
155 | |
156 | push @source => "}"; |
157 | } |
158 | else { |
8ecb1fa0 |
159 | push @source => '(exists $params{\'' . $attr->init_arg . '\'}) && do {'; |
160 | |
161 | push @source => ('my $val = $params{\'' . $attr->init_arg . '\'};'); |
162 | if ($attr->has_type_constraint) { |
163 | push @source => ('my $type_constraint = $attrs->[' . $index . ']->type_constraint;'); |
164 | |
165 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
166 | push @source => $self->_generate_type_coercion($attr, '$type_constraint', '$val', '$val'); |
167 | } |
168 | push @source => $self->_generate_type_constraint_check($attr, '$type_constraint', '$val'); |
169 | } |
170 | push @source => $self->_generate_slot_assignment($attr, '$val'); |
171 | |
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172 | push @source => "}"; |
173 | } |
174 | |
175 | return join "\n" => @source; |
176 | } |
177 | |
178 | sub _generate_slot_assignment { |
179 | my ($self, $attr, $value) = @_; |
180 | my $source = ( |
181 | $self->meta_instance->inline_set_slot_value( |
182 | '$instance', |
183 | ("'" . $attr->name . "'"), |
184 | $value |
185 | ) . ';' |
186 | ); |
187 | |
188 | if ($attr->is_weak_ref) { |
189 | $source .= ( |
190 | "\n" . |
191 | $self->meta_instance->inline_weaken_slot_value( |
192 | '$instance', |
193 | ("'" . $attr->name . "'") |
194 | ) . |
195 | ' if ref ' . $value . ';' |
196 | ); |
197 | } |
198 | |
199 | return $source; |
200 | } |
201 | |
202 | sub _generate_type_coercion { |
203 | my ($self, $attr, $type_constraint_name, $value_name, $return_value_name) = @_; |
204 | return ($return_value_name . ' = ' . $type_constraint_name . '->coerce(' . $value_name . ');'); |
205 | } |
206 | |
207 | sub _generate_type_constraint_check { |
208 | my ($self, $attr, $type_constraint_name, $value_name) = @_; |
209 | return ( |
210 | 'defined(' . $type_constraint_name . '->_compiled_type_constraint->(' . $value_name . '))' |
211 | . "\n\t" . '|| confess "Attribute (' . $attr->name . ') does not pass the type constraint (' |
212 | . $attr->type_constraint->name . ') with " . (defined() ? "' . $value_name . '" : "undef");' |
213 | ); |
214 | } |
215 | |
216 | sub _generate_default_value { |
217 | my ($self, $attr, $index) = @_; |
218 | # NOTE: |
219 | # default values can either be CODE refs |
220 | # in which case we need to call them. Or |
221 | # they can be scalars (strings/numbers) |
222 | # in which case we can just deal with them |
223 | # in the code we eval. |
224 | if ($attr->is_default_a_coderef) { |
225 | return '$attrs->[' . $index . ']->default($instance)'; |
226 | } |
227 | else { |
228 | my $default = $attr->default; |
229 | # make sure to quote strings ... |
230 | unless (looks_like_number($default)) { |
231 | $default = "'$default'"; |
232 | } |
233 | |
234 | return $default; |
235 | } |
236 | } |
237 | |
238 | 1; |
239 | |
240 | 1; |
241 | |
242 | __END__ |
243 | |
244 | =pod |
245 | |
246 | =head1 NAME |
247 | |
248 | Moose::Meta::Method::Constructor - Method Meta Object for constructors |
249 | |
250 | =head1 SYNOPSIS |
251 | |
252 | =head1 DESCRIPTION |
253 | |
254 | =head1 METHODS |
255 | |
256 | =over 4 |
257 | |
258 | =item B<new> |
259 | |
260 | =item B<attributes> |
261 | |
262 | =item B<meta_instance> |
263 | |
264 | =item B<options> |
265 | |
266 | =item B<intialize_body> |
267 | |
268 | =item B<associated_metaclass> |
269 | |
270 | =back |
271 | |
272 | =head1 AUTHORS |
273 | |
274 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
275 | |
276 | =head1 COPYRIGHT AND LICENSE |
277 | |
278 | Copyright 2006 by Infinity Interactive, Inc. |
279 | |
280 | L<http://www.iinteractive.com> |
281 | |
282 | This library is free software; you can redistribute it and/or modify |
283 | it under the same terms as Perl itself. |
284 | |
285 | =cut |
286 | |