1 package Mouse::Meta::Method::Constructor;
2 use Mouse::Util; # enables strict and warnings
4 sub _generate_constructor_method {
5 my ($class, $metaclass, $args) = @_;
7 my $associated_metaclass_name = $metaclass->name;
9 my @attrs = $metaclass->get_all_attributes;
11 my $buildall = $class->_generate_BUILDALL($metaclass);
12 my $buildargs = $class->_generate_BUILDARGS($metaclass);
13 my $processattrs = $class->_generate_processattrs($metaclass, \@attrs);
15 my @checks = map { $_ && $_->_compiled_type_constraint }
16 map { $_->type_constraint } @attrs;
18 my $source = sprintf("#line %d %s\n", __LINE__, __FILE__).<<"...";
21 return \$class->Mouse::Object::new(\@_)
22 if \$class ne q{$associated_metaclass_name};
25 my \$instance = bless {}, \$class;
42 $metaclass->add_method($args->{constructor_name} => $code);
46 sub _generate_processattrs {
47 my ($class, $metaclass, $attrs) = @_;
52 for my $index (0 .. @$attrs - 1) {
55 my $attr = $attrs->[$index];
56 my $key = $attr->name;
58 my $init_arg = $attr->init_arg;
59 my $type_constraint = $attr->type_constraint;
62 my $instance_slot = "\$instance->{q{$key}}";
63 my $attr_var = "\$attrs[$index]";
66 if(defined $type_constraint){
67 $constraint_var = "$attr_var\->{type_constraint}";
68 $need_coercion = ($attr->should_coerce && $type_constraint->has_coercion);
71 $code .= "# initialize $key\n";
73 my $post_process = '';
74 if(defined $type_constraint){
75 $post_process .= "\$checks[$index]->($instance_slot)";
76 $post_process .= " or $attr_var->verify_type_constraint_error(q{$key}, $instance_slot, $constraint_var);\n";
78 if($attr->is_weak_ref){
79 $post_process .= "Scalar::Util::weaken($instance_slot) if ref $instance_slot;\n";
82 if (defined $init_arg) {
83 my $value = "\$args->{q{$init_arg}}";
85 $code .= "if (exists $value) {\n";
88 $value = "$instance_slot = $constraint_var->coerce($value);\n";
91 $code .= "$instance_slot = $value;\n";
92 $code .= $post_process;
94 if ($attr->has_trigger) {
96 $code .= "push \@triggers, [$attr_var\->{trigger}, $value];\n";
99 $code .= "\n} else {\n";
102 if ($attr->has_default || $attr->has_builder) {
103 unless ($attr->is_lazy) {
104 my $default = $attr->default;
105 my $builder = $attr->builder;
108 if (defined($builder)) {
109 $value = "\$instance->$builder()";
111 elsif (ref($default) eq 'CODE') {
112 $value = "$attr_var\->{default}->(\$instance)";
114 elsif (defined($default)) {
115 $value = "$attr_var\->{default}";
122 $value = "$constraint_var->coerce($value)";
125 $code .= "$instance_slot = $value;\n";
128 elsif ($attr->is_required) {
129 $code .= "Carp::confess('Attribute ($key) is required');";
132 $code .= "}\n" if defined $init_arg;
137 if($metaclass->is_anon_class){
138 push @res, q{$instnace->{__METACLASS__} = $metaclass;};
142 unshift @res, q{my @triggers;};
143 push @res, q{$_->[0]->($instance, $_->[1]) for @triggers;};
146 return join "\n", @res;
149 sub _generate_BUILDARGS {
150 my(undef, $metaclass) = @_;
152 my $class = $metaclass->name;
153 if ( $class->can('BUILDARGS') && $class->can('BUILDARGS') != \&Mouse::Object::BUILDARGS ) {
154 return 'my $args = $class->BUILDARGS(@_)';
159 if ( scalar @_ == 1 ) {
160 ( ref( $_[0] ) eq 'HASH' )
161 || Carp::confess "Single parameters to new() must be a HASH ref";
162 $args = +{ %{ $_[0] } };
170 sub _generate_BUILDALL {
171 my (undef, $metaclass) = @_;
173 return '' unless $metaclass->name->can('BUILD');
176 for my $class ($metaclass->linearized_isa) {
180 if (*{ $class . '::BUILD' }{CODE}) {
181 unshift @code, qq{${class}::BUILD(\$instance, \$args);};
184 return join "\n", @code;