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1 | |
2 | package Class::MOP::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 'Class::MOP::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"; |
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21 | |
22 | my $self = bless { |
23 | # from our superclass |
c23184fc |
24 | '&!body' => undef, |
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25 | # specific to this subclass |
c23184fc |
26 | '%!options' => $options{options}, |
27 | '$!meta_instance' => $options{metaclass}->get_meta_instance, |
28 | '@!attributes' => [ $options{metaclass}->compute_all_applicable_attributes ], |
29 | # ... |
30 | '$!associated_metaclass' => $options{metaclass}, |
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31 | } => $class; |
32 | |
33 | # we don't want this creating |
34 | # a cycle in the code, if not |
35 | # needed |
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36 | # weaken($self->{'$!meta_instance'}); |
37 | weaken($self->{'$!associated_metaclass'}); |
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38 | |
39 | $self->intialize_body; |
40 | |
41 | return $self; |
42 | } |
43 | |
c23184fc |
44 | ## predicates |
45 | |
46 | # NOTE: |
47 | # if it is blessed into this class, |
48 | # then it is always inlined, that is |
49 | # pretty much what this class is for. |
50 | sub is_inline { 1 } |
51 | |
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52 | ## accessors |
53 | |
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54 | sub options { (shift)->{'%!options'} } |
55 | sub meta_instance { (shift)->{'$!meta_instance'} } |
56 | sub attributes { (shift)->{'@!attributes'} } |
57 | |
58 | sub associated_metaclass { (shift)->{'$!associated_metaclass'} } |
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59 | |
60 | ## method |
61 | |
62 | sub intialize_body { |
63 | my $self = shift; |
64 | # TODO: |
65 | # the %options should also include a both |
66 | # a call 'initializer' and call 'SUPER::' |
67 | # options, which should cover approx 90% |
68 | # of the possible use cases (even if it |
69 | # requires some adaption on the part of |
70 | # the author, after all, nothing is free) |
71 | my $source = 'sub {'; |
72 | $source .= "\n" . 'my ($class, %params) = @_;'; |
73 | $source .= "\n" . 'my $instance = ' . $self->meta_instance->inline_create_instance('$class'); |
74 | $source .= ";\n" . (join ";\n" => map { |
75 | $self->_generate_slot_initializer($_) |
76 | } 0 .. (@{$self->attributes} - 1)); |
77 | $source .= ";\n" . 'return $instance'; |
78 | $source .= ";\n" . '}'; |
79 | warn $source if $self->options->{debug}; |
80 | |
81 | my $code; |
82 | { |
83 | # NOTE: |
84 | # create the nessecary lexicals |
85 | # to be picked up in the eval |
86 | my $attrs = $self->attributes; |
87 | |
88 | $code = eval $source; |
89 | confess "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$@" if $@; |
90 | } |
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91 | $self->{'&!body'} = $code; |
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92 | } |
93 | |
94 | sub _generate_slot_initializer { |
95 | my $self = shift; |
96 | my $index = shift; |
97 | |
98 | my $attr = $self->attributes->[$index]; |
99 | |
100 | my $default; |
101 | if ($attr->has_default) { |
102 | # NOTE: |
103 | # default values can either be CODE refs |
104 | # in which case we need to call them. Or |
105 | # they can be scalars (strings/numbers) |
106 | # in which case we can just deal with them |
107 | # in the code we eval. |
108 | if ($attr->is_default_a_coderef) { |
109 | $default = '$attrs->[' . $index . ']->default($instance)'; |
110 | } |
111 | else { |
112 | $default = $attr->default; |
113 | # make sure to quote strings ... |
114 | unless (looks_like_number($default)) { |
115 | $default = "'$default'"; |
116 | } |
117 | } |
118 | } |
119 | $self->meta_instance->inline_set_slot_value( |
120 | '$instance', |
121 | ("'" . $attr->name . "'"), |
122 | ('$params{\'' . $attr->init_arg . '\'}' . (defined $default ? (' || ' . $default) : '')) |
123 | ); |
124 | } |
125 | |
126 | 1; |
127 | |
128 | 1; |
129 | |
130 | __END__ |
131 | |
132 | =pod |
133 | |
134 | =head1 NAME |
135 | |
136 | Class::MOP::Method::Constructor - Method Meta Object for constructors |
137 | |
138 | =head1 SYNOPSIS |
139 | |
140 | =head1 DESCRIPTION |
141 | |
142 | =head1 METHODS |
143 | |
144 | =over 4 |
145 | |
146 | =item B<new> |
147 | |
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148 | =item B<is_inline> |
149 | |
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150 | =item B<attributes> |
151 | |
152 | =item B<meta_instance> |
153 | |
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154 | =item B<associated_metaclass> |
155 | |
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156 | =item B<options> |
157 | |
158 | =item B<intialize_body> |
159 | |
160 | =back |
161 | |
162 | =head1 AUTHORS |
163 | |
164 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
165 | |
166 | =head1 COPYRIGHT AND LICENSE |
167 | |
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168 | Copyright 2006, 2007 by Infinity Interactive, Inc. |
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169 | |
170 | L<http://www.iinteractive.com> |
171 | |
172 | This library is free software; you can redistribute it and/or modify |
173 | it under the same terms as Perl itself. |
174 | |
175 | =cut |
176 | |