Checking in changes prior to tagging of version 0.81.
[gitmo/Mouse.git] / lib / Mouse / Meta / Method / Accessor.pm
CommitLineData
a41c0667 1package Mouse::Meta::Method::Accessor;
3821b191 2use Mouse::Util qw(:meta); # enables strict and warnings
f031f4d5 3
68ad9d66 4use constant _MOUSE_DEBUG => !!$ENV{MOUSE_DEBUG};
5
f031f4d5 6sub _inline_slot{
7 my(undef, $self_var, $attr_name) = @_;
8 return sprintf '%s->{q{%s}}', $self_var, $attr_name;
9}
f8cbb121 10
bb4204b1 11sub _generate_accessor_any{
12 my($method_class, $type, $attribute, $class) = @_;
a41c0667 13
f031f4d5 14 my $name = $attribute->name;
a41c0667 15 my $default = $attribute->default;
16 my $constraint = $attribute->type_constraint;
17 my $builder = $attribute->builder;
18 my $trigger = $attribute->trigger;
19 my $is_weak = $attribute->is_weak_ref;
20 my $should_deref = $attribute->should_auto_deref;
cd00d876 21 my $should_coerce = (defined($constraint) && $constraint->has_coercion && $attribute->should_coerce);
a41c0667 22
cd00d876 23 my $compiled_type_constraint = defined($constraint) ? $constraint->_compiled_type_constraint : undef;
a41c0667 24
f031f4d5 25 my $self = '$_[0]';
26 my $slot = $method_class->_inline_slot($self, $name);;
a41c0667 27
f031f4d5 28 my $accessor = sprintf(qq{package %s;\n#line 1 "%s-accessor for %s (%s)"\n}, $class->name, $type, $name, __FILE__)
29 . "sub {\n";
2a464664 30
bb4204b1 31 if ($type eq 'rw' || $type eq 'wo') {
32 if($type eq 'rw'){
a41c0667 33 $accessor .=
a41c0667 34 'if (scalar(@_) >= 2) {' . "\n";
35 }
36 else{ # writer
37 $accessor .=
f4118476 38 'if(@_ < 2){ Carp::confess("Not enough arguments for the writer of $name") }'.
a41c0667 39 '{' . "\n";
40 }
41
42 my $value = '$_[1]';
43
14d7595a 44 if (defined $constraint) {
a41c0667 45 if ($should_coerce) {
46 $accessor .=
47 "\n".
ffbbf459 48 'my $val = $constraint->coerce('.$value.');';
a41c0667 49 $value = '$val';
50 }
14d7595a 51 $accessor .=
52 "\n".
cd00d876 53 '$compiled_type_constraint->('.$value.') or
da23cd4a 54 $attribute->_throw_type_constraint_error('.$value.', $constraint);' . "\n";
a41c0667 55 }
56
57 # if there's nothing left to do for the attribute we can return during
58 # this setter
59 $accessor .= 'return ' if !$is_weak && !$trigger && !$should_deref;
60
f031f4d5 61 $accessor .= "$slot = $value;\n";
a41c0667 62
63 if ($is_weak) {
f031f4d5 64 $accessor .= "Scalar::Util::weaken($slot) if ref $slot;\n";
a41c0667 65 }
66
67 if ($trigger) {
f031f4d5 68 $accessor .= '$trigger->('.$self.', '.$value.');' . "\n";
a41c0667 69 }
70
71 $accessor .= "}\n";
72 }
bb4204b1 73 elsif($type eq 'ro') {
f4118476 74 $accessor .= 'Carp::confess("Cannot assign a value to a read-only accessor of $name") if scalar(@_) >= 2;' . "\n";
a41c0667 75 }
76 else{
77 $class->throw_error("Unknown accessor type '$type'");
78 }
79
52b9f5fa 80 if ($attribute->is_lazy and $type ne 'wo') {
cd00d876 81 my $value;
a41c0667 82
cd00d876 83 if (defined $builder){
f031f4d5 84 $value = "$self->\$builder()";
cd00d876 85 }
86 elsif (ref($default) eq 'CODE'){
f031f4d5 87 $value = "$self->\$default()";
cd00d876 88 }
89 else{
90 $value = '$default';
14d7595a 91 }
14d7595a 92
52b9f5fa 93 $accessor .= "els" if $type eq 'rw';
f031f4d5 94 $accessor .= "if(!exists $slot){\n";
cd00d876 95 if($should_coerce){
f031f4d5 96 $accessor .= "$slot = \$constraint->coerce($value)";
14d7595a 97 }
95ecd6f1 98 elsif(defined $constraint){
99 $accessor .= "my \$tmp = $value;\n";
100 $accessor .= "\$compiled_type_constraint->(\$tmp)";
da23cd4a 101 $accessor .= " || \$attribute->_throw_type_constraint_error(\$tmp, \$constraint);\n";
f031f4d5 102 $accessor .= "$slot = \$tmp;\n";
103 }
104 else{
105 $accessor .= "$slot = $value;\n";
95ecd6f1 106 }
3f2c3dc7 107 if ($is_weak) {
f031f4d5 108 $accessor .= "Scalar::Util::weaken($slot) if ref $slot;\n";
3f2c3dc7 109 }
95ecd6f1 110 $accessor .= "}\n";
a41c0667 111 }
112
113 if ($should_deref) {
114 if ($constraint->is_a_type_of('ArrayRef')) {
cd00d876 115 $accessor .= "return \@{ $slot || [] } if wantarray;\n";
a41c0667 116 }
117 elsif($constraint->is_a_type_of('HashRef')){
cd00d876 118 $accessor .= "return \%{ $slot || {} } if wantarray;\n";
a41c0667 119 }
120 else{
121 $class->throw_error("Can not auto de-reference the type constraint " . $constraint->name);
122 }
123 }
124
cd00d876 125 $accessor .= "return $slot;\n}\n";
a41c0667 126
68ad9d66 127 warn $accessor if _MOUSE_DEBUG;
2a464664 128 my $code;
129 my $e = do{
130 local $@;
131 $code = eval $accessor;
132 $@;
133 };
134 die $e if $e;
135
ad087d11 136 return $code;
a41c0667 137}
138
bb4204b1 139sub _generate_accessor{
230dd14a 140 #my($self, $attribute, $metaclass) = @_;
141 my $self = shift;
142 return $self->_generate_accessor_any(rw => @_);
a41c0667 143}
144
bb4204b1 145sub _generate_reader {
230dd14a 146 #my($self, $attribute, $metaclass) = @_;
147 my $self = shift;
148 return $self->_generate_accessor_any(ro => @_);
a41c0667 149}
150
bb4204b1 151sub _generate_writer {
230dd14a 152 #my($self, $attribute, $metaclass) = @_;
153 my $self = shift;
154 return $self->_generate_accessor_any(wo => @_);
bb4204b1 155}
a41c0667 156
2a464664 157sub _generate_predicate {
230dd14a 158 #my($self, $attribute, $metaclass) = @_;
159 my(undef, $attribute) = @_;
a41c0667 160
7b133c92 161 my $slot = $attribute->name;
4ab51fb0 162 return sub{
7b133c92 163 return exists $_[0]->{$slot};
4ab51fb0 164 };
a41c0667 165}
166
2a464664 167sub _generate_clearer {
230dd14a 168 #my($self, $attribute, $metaclass) = @_;
169 my(undef, $attribute) = @_;
a41c0667 170
7b133c92 171 my $slot = $attribute->name;
bb4204b1 172 return sub{
7b133c92 173 delete $_[0]->{$slot};
4ab51fb0 174 };
a41c0667 175}
176
a41c0667 1771;
0126c27c 178__END__
a25ca8d6 179
180=head1 NAME
181
182Mouse::Meta::Method::Accessor - A Mouse method generator for accessors
183
184=head1 VERSION
185
ce1cb320 186This document describes Mouse version 0.81
a25ca8d6 187
188=head1 SEE ALSO
189
190L<Moose::Meta::Method::Accessor>
191
192=cut