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1 | package Mouse::Meta::Method::Constructor; |
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2 | use Mouse::Util; # enables strict and warnings |
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3 | |
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4 | sub _generate_constructor { |
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5 | my ($class, $metaclass, $args) = @_; |
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6 | |
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7 | my $associated_metaclass_name = $metaclass->name; |
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8 | |
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9 | my @attrs = $metaclass->get_all_attributes; |
10 | |
11 | my $buildall = $class->_generate_BUILDALL($metaclass); |
12 | my $buildargs = $class->_generate_BUILDARGS($metaclass); |
13 | my $processattrs = $class->_generate_processattrs($metaclass, \@attrs); |
14 | |
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15 | my @checks = map { $_ && $_->_compiled_type_constraint } |
16 | map { $_->type_constraint } @attrs; |
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17 | |
18 | my $source = sprintf("#line %d %s\n", __LINE__, __FILE__).<<"..."; |
19 | sub \{ |
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20 | my \$class = shift; |
21 | return \$class->Mouse::Object::new(\@_) |
22 | if \$class ne q{$associated_metaclass_name}; |
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23 | # BUILDARGS |
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24 | $buildargs; |
25 | my \$instance = bless {}, \$class; |
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26 | # process attributes |
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27 | $processattrs; |
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28 | # BUILDALL |
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29 | $buildall; |
30 | return \$instance; |
31 | } |
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32 | ... |
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33 | #warn $source; |
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34 | my $code; |
35 | my $e = do{ |
36 | local $@; |
37 | $code = eval $source; |
38 | $@; |
39 | }; |
40 | die $e if $e; |
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41 | return $code; |
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42 | } |
43 | |
44 | sub _generate_processattrs { |
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45 | my ($class, $metaclass, $attrs) = @_; |
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46 | my @res; |
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47 | |
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48 | my $has_triggers; |
49 | |
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50 | for my $index (0 .. @$attrs - 1) { |
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51 | my $code = ''; |
52 | |
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53 | my $attr = $attrs->[$index]; |
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54 | my $key = $attr->name; |
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55 | |
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56 | my $init_arg = $attr->init_arg; |
57 | my $type_constraint = $attr->type_constraint; |
58 | my $need_coercion; |
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59 | |
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60 | my $instance_slot = "\$instance->{q{$key}}"; |
61 | my $attr_var = "\$attrs[$index]"; |
62 | my $constraint_var; |
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63 | |
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64 | if(defined $type_constraint){ |
65 | $constraint_var = "$attr_var\->{type_constraint}"; |
66 | $need_coercion = ($attr->should_coerce && $type_constraint->has_coercion); |
67 | } |
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68 | |
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69 | $code .= "# initialize $key\n"; |
70 | |
71 | my $post_process = ''; |
72 | if(defined $type_constraint){ |
73 | $post_process .= "\$checks[$index]->($instance_slot)"; |
74 | $post_process .= " or $attr_var->verify_type_constraint_error(q{$key}, $instance_slot, $constraint_var);\n"; |
75 | } |
76 | if($attr->is_weak_ref){ |
77 | $post_process .= "Scalar::Util::weaken($instance_slot) if ref $instance_slot;\n"; |
78 | } |
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79 | |
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80 | if (defined $init_arg) { |
81 | my $value = "\$args->{q{$init_arg}}"; |
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82 | |
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83 | $code .= "if (exists $value) {\n"; |
84 | |
85 | if($need_coercion){ |
86 | $value = "$instance_slot = $constraint_var->coerce($value);\n"; |
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87 | } |
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88 | |
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89 | $code .= "$instance_slot = $value;\n"; |
90 | $code .= $post_process; |
91 | |
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92 | if ($attr->has_trigger) { |
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93 | $has_triggers++; |
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94 | $code .= "push \@triggers, [$attr_var\->{trigger}, $value];\n"; |
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95 | } |
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96 | |
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97 | $code .= "\n} else {\n"; |
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98 | } |
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99 | |
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100 | if ($attr->has_default || $attr->has_builder) { |
101 | unless ($attr->is_lazy) { |
102 | my $default = $attr->default; |
103 | my $builder = $attr->builder; |
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104 | |
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105 | my $value; |
106 | if (defined($builder)) { |
107 | $value = "\$instance->$builder()"; |
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108 | } |
109 | elsif (ref($default) eq 'CODE') { |
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110 | $value = "$attr_var\->{default}->(\$instance)"; |
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111 | } |
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112 | elsif (defined($default)) { |
113 | $value = "$attr_var\->{default}"; |
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114 | } |
115 | else { |
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116 | $value = 'undef'; |
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117 | } |
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118 | |
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119 | if($need_coercion){ |
120 | $value = "$constraint_var->coerce($value)"; |
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121 | } |
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122 | |
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123 | $code .= "$instance_slot = $value;\n"; |
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124 | } |
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125 | } |
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126 | elsif ($attr->is_required) { |
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127 | $code .= "Carp::confess('Attribute ($key) is required');"; |
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128 | } |
129 | |
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130 | $code .= "}\n" if defined $init_arg; |
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131 | |
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132 | push @res, $code; |
133 | } |
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134 | |
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135 | if($metaclass->is_anon_class){ |
136 | push @res, q{$instnace->{__METACLASS__} = $metaclass;}; |
137 | } |
138 | |
139 | if($has_triggers){ |
140 | unshift @res, q{my @triggers;}; |
141 | push @res, q{$_->[0]->($instance, $_->[1]) for @triggers;}; |
142 | } |
143 | |
144 | return join "\n", @res; |
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145 | } |
146 | |
147 | sub _generate_BUILDARGS { |
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148 | my(undef, $metaclass) = @_; |
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149 | |
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150 | my $class = $metaclass->name; |
151 | if ( $class->can('BUILDARGS') && $class->can('BUILDARGS') != \&Mouse::Object::BUILDARGS ) { |
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152 | return 'my $args = $class->BUILDARGS(@_)'; |
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153 | } |
154 | |
155 | return <<'...'; |
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156 | my $args; |
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157 | if ( scalar @_ == 1 ) { |
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158 | ( ref( $_[0] ) eq 'HASH' ) |
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159 | || Carp::confess "Single parameters to new() must be a HASH ref"; |
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160 | $args = +{ %{ $_[0] } }; |
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161 | } |
162 | else { |
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163 | $args = +{@_}; |
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164 | } |
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165 | ... |
166 | } |
167 | |
168 | sub _generate_BUILDALL { |
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169 | my (undef, $metaclass) = @_; |
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170 | |
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171 | return '' unless $metaclass->name->can('BUILD'); |
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172 | |
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173 | my @code; |
174 | for my $class ($metaclass->linearized_isa) { |
175 | no strict 'refs'; |
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176 | no warnings 'once'; |
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177 | |
178 | if (*{ $class . '::BUILD' }{CODE}) { |
179 | unshift @code, qq{${class}::BUILD(\$instance, \$args);}; |
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180 | } |
181 | } |
182 | return join "\n", @code; |
183 | } |
184 | |
185 | 1; |