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1 | package Mouse::Meta::Method::Accessor; |
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2 | use Mouse::Util; # enables strict and warnings |
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3 | use Scalar::Util qw(blessed); |
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4 | |
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5 | sub _generate_accessor{ |
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6 | my (undef, $attribute, $class, $type) = @_; |
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7 | |
8 | my $name = $attribute->name; |
9 | my $default = $attribute->default; |
10 | my $constraint = $attribute->type_constraint; |
11 | my $builder = $attribute->builder; |
12 | my $trigger = $attribute->trigger; |
13 | my $is_weak = $attribute->is_weak_ref; |
14 | my $should_deref = $attribute->should_auto_deref; |
15 | my $should_coerce = $attribute->should_coerce; |
16 | |
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17 | my $compiled_type_constraint = $constraint ? $constraint->_compiled_type_constraint : undef; |
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18 | |
19 | my $self = '$_[0]'; |
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20 | my $key = sprintf q{"%s"}, quotemeta $name; |
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21 | |
22 | $type ||= 'accessor'; |
23 | |
24 | my $accessor = |
25 | '#line ' . __LINE__ . ' "' . __FILE__ . "\"\n" . |
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26 | "sub {\n"; |
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27 | |
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28 | if ($type eq 'accessor' || $type eq 'writer') { |
29 | if($type eq 'accessor'){ |
30 | $accessor .= |
31 | '#line ' . __LINE__ . ' "' . __FILE__ . "\"\n" . |
32 | 'if (scalar(@_) >= 2) {' . "\n"; |
33 | } |
34 | else{ # writer |
35 | $accessor .= |
36 | '#line ' . __LINE__ . ' "' . __FILE__ . "\"\n" . |
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37 | 'if(@_ < 2){ Carp::confess("Not enough arguments for the writer of '.$name.'") }'. |
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38 | '{' . "\n"; |
39 | } |
40 | |
41 | my $value = '$_[1]'; |
42 | |
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43 | if (defined $constraint) { |
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44 | if(!$compiled_type_constraint){ |
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45 | Carp::confess("[BUG] Missing compiled type constraint for $constraint"); |
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46 | } |
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47 | if ($should_coerce) { |
48 | $accessor .= |
49 | "\n". |
50 | '#line ' . __LINE__ . ' "' . __FILE__ . "\"\n" . |
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51 | 'my $val = $constraint->coerce('.$value.');'; |
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52 | $value = '$val'; |
53 | } |
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54 | $accessor .= |
55 | "\n". |
56 | '#line ' . __LINE__ . ' "' . __FILE__ . "\"\n" . |
57 | 'unless ($compiled_type_constraint->('.$value.')) { |
58 | $attribute->verify_type_constraint_error($name, '.$value.', $attribute->{type_constraint}); |
59 | }' . "\n"; |
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60 | } |
61 | |
62 | # if there's nothing left to do for the attribute we can return during |
63 | # this setter |
64 | $accessor .= 'return ' if !$is_weak && !$trigger && !$should_deref; |
65 | |
66 | $accessor .= $self.'->{'.$key.'} = '.$value.';' . "\n"; |
67 | |
68 | if ($is_weak) { |
69 | $accessor .= 'Scalar::Util::weaken('.$self.'->{'.$key.'}) if ref('.$self.'->{'.$key.'});' . "\n"; |
70 | } |
71 | |
72 | if ($trigger) { |
73 | $accessor .= '$trigger->('.$self.', '.$value.');' . "\n"; |
74 | } |
75 | |
76 | $accessor .= "}\n"; |
77 | } |
78 | elsif($type eq 'reader') { |
79 | $accessor .= 'Carp::confess("Cannot assign a value to a read-only accessor") if scalar(@_) >= 2;' . "\n"; |
80 | } |
81 | else{ |
82 | $class->throw_error("Unknown accessor type '$type'"); |
83 | } |
84 | |
85 | if ($attribute->is_lazy) { |
86 | $accessor .= $self.'->{'.$key.'} = '; |
87 | |
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88 | if($should_coerce && defined($constraint)){ |
89 | $accessor .= '$attribute->_coerce_and_verify('; |
90 | } |
91 | $accessor .= $attribute->has_builder ? $self.'->$builder' |
92 | : ref($default) eq 'CODE' ? '$default->('.$self.')' |
93 | : '$default'; |
94 | |
95 | if($should_coerce && defined $constraint){ |
96 | $accessor .= ')'; |
97 | } |
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98 | $accessor .= ' if !exists '.$self.'->{'.$key.'};' . "\n"; |
99 | } |
100 | |
101 | if ($should_deref) { |
102 | if ($constraint->is_a_type_of('ArrayRef')) { |
103 | $accessor .= 'if (wantarray) { |
104 | return @{ '.$self.'->{'.$key.'} || [] }; |
105 | }'; |
106 | } |
107 | elsif($constraint->is_a_type_of('HashRef')){ |
108 | $accessor .= 'if (wantarray) { |
109 | return %{ '.$self.'->{'.$key.'} || {} }; |
110 | }'; |
111 | } |
112 | else{ |
113 | $class->throw_error("Can not auto de-reference the type constraint " . $constraint->name); |
114 | } |
115 | } |
116 | |
117 | $accessor .= 'return '.$self.'->{'.$key."};\n}"; |
118 | |
119 | #print $accessor, "\n"; |
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120 | my $code; |
121 | my $e = do{ |
122 | local $@; |
123 | $code = eval $accessor; |
124 | $@; |
125 | }; |
126 | die $e if $e; |
127 | |
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128 | return $code; |
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129 | } |
130 | |
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131 | sub _generate_reader{ |
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132 | my $class = shift; |
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133 | return $class->_generate_accessor(@_, 'reader'); |
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134 | } |
135 | |
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136 | sub _generate_writer{ |
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137 | my $class = shift; |
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138 | return $class->_generate_accessor(@_, 'writer'); |
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139 | } |
140 | |
141 | |
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142 | sub _generate_predicate { |
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143 | my (undef, $attribute, $class) = @_; |
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144 | |
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145 | my $slot = $attribute->name; |
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146 | return sub{ |
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147 | return exists $_[0]->{$slot}; |
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148 | }; |
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149 | } |
150 | |
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151 | sub _generate_clearer { |
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152 | my (undef, $attribute, $class) = @_; |
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153 | |
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154 | my $slot = $attribute->name; |
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155 | |
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156 | return sub{ |
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157 | delete $_[0]->{$slot}; |
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158 | }; |
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159 | } |
160 | |
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161 | sub _generate_delegation{ |
162 | my (undef, $attribute, $class, $reader, $handle_name, $method_to_call) = @_; |
163 | |
164 | return sub { |
165 | my $instance = shift; |
166 | my $proxy = $instance->$reader(); |
167 | |
168 | my $error = !defined($proxy) ? ' is not defined' |
169 | : ref($proxy) && !blessed($proxy) ? qq{ is not an object (got '$proxy')} |
170 | : undef; |
171 | if ($error) { |
172 | $instance->meta->throw_error( |
173 | "Cannot delegate $handle_name to $method_to_call because " |
174 | . "the value of " |
175 | . $attribute->name |
176 | . $error |
177 | ); |
178 | } |
179 | $proxy->$method_to_call(@_); |
180 | }; |
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181 | } |
182 | |
183 | |
184 | 1; |