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1 | package Mouse::Meta::Method::Constructor; |
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2 | use Mouse::Util qw(get_code_ref); # enables strict and warnings |
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3 | |
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4 | sub _inline_slot{ |
5 | my(undef, $self_var, $attr_name) = @_; |
6 | return sprintf '%s->{q{%s}}', $self_var, $attr_name; |
7 | } |
8 | |
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9 | sub _generate_constructor { |
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10 | my ($class, $metaclass, $args) = @_; |
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11 | |
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12 | my $associated_metaclass_name = $metaclass->name; |
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13 | |
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14 | my @attrs = $metaclass->get_all_attributes; |
15 | |
16 | my $buildall = $class->_generate_BUILDALL($metaclass); |
17 | my $buildargs = $class->_generate_BUILDARGS($metaclass); |
18 | my $processattrs = $class->_generate_processattrs($metaclass, \@attrs); |
19 | |
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20 | my @checks = map { $_ && $_->_compiled_type_constraint } |
21 | map { $_->type_constraint } @attrs; |
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22 | |
23 | my $source = sprintf("#line %d %s\n", __LINE__, __FILE__).<<"..."; |
24 | sub \{ |
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25 | my \$class = shift; |
26 | return \$class->Mouse::Object::new(\@_) |
27 | if \$class ne q{$associated_metaclass_name}; |
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28 | # BUILDARGS |
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29 | $buildargs; |
30 | my \$instance = bless {}, \$class; |
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31 | # process attributes |
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32 | $processattrs; |
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33 | # BUILDALL |
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34 | $buildall; |
35 | return \$instance; |
36 | } |
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37 | ... |
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38 | #warn $source; |
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39 | my $code; |
40 | my $e = do{ |
41 | local $@; |
42 | $code = eval $source; |
43 | $@; |
44 | }; |
45 | die $e if $e; |
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46 | return $code; |
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47 | } |
48 | |
49 | sub _generate_processattrs { |
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50 | my ($method_class, $metaclass, $attrs) = @_; |
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51 | my @res; |
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52 | |
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53 | my $has_triggers; |
54 | |
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55 | for my $index (0 .. @$attrs - 1) { |
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56 | my $code = ''; |
57 | |
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58 | my $attr = $attrs->[$index]; |
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59 | my $key = $attr->name; |
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60 | |
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61 | my $init_arg = $attr->init_arg; |
62 | my $type_constraint = $attr->type_constraint; |
63 | my $need_coercion; |
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64 | |
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65 | my $instance_slot = $method_class->_inline_slot('$instance', $key); |
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66 | my $attr_var = "\$attrs[$index]"; |
67 | my $constraint_var; |
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68 | |
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69 | if(defined $type_constraint){ |
70 | $constraint_var = "$attr_var\->{type_constraint}"; |
71 | $need_coercion = ($attr->should_coerce && $type_constraint->has_coercion); |
72 | } |
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73 | |
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74 | $code .= "# initialize $key\n"; |
75 | |
76 | my $post_process = ''; |
77 | if(defined $type_constraint){ |
78 | $post_process .= "\$checks[$index]->($instance_slot)"; |
79 | $post_process .= " or $attr_var->verify_type_constraint_error(q{$key}, $instance_slot, $constraint_var);\n"; |
80 | } |
81 | if($attr->is_weak_ref){ |
82 | $post_process .= "Scalar::Util::weaken($instance_slot) if ref $instance_slot;\n"; |
83 | } |
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84 | |
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85 | if (defined $init_arg) { |
86 | my $value = "\$args->{q{$init_arg}}"; |
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87 | |
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88 | $code .= "if (exists $value) {\n"; |
89 | |
90 | if($need_coercion){ |
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91 | $value = "$constraint_var->coerce($value)"; |
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92 | } |
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93 | |
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94 | $code .= "$instance_slot = $value;\n"; |
95 | $code .= $post_process; |
96 | |
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97 | if ($attr->has_trigger) { |
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98 | $has_triggers++; |
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99 | $code .= "push \@triggers, [$attr_var\->{trigger}, $instance_slot];\n"; |
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100 | } |
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101 | |
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102 | $code .= "\n} else {\n"; |
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103 | } |
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104 | |
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105 | if ($attr->has_default || $attr->has_builder) { |
106 | unless ($attr->is_lazy) { |
107 | my $default = $attr->default; |
108 | my $builder = $attr->builder; |
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109 | |
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110 | my $value; |
111 | if (defined($builder)) { |
112 | $value = "\$instance->$builder()"; |
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113 | } |
114 | elsif (ref($default) eq 'CODE') { |
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115 | $value = "$attr_var\->{default}->(\$instance)"; |
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116 | } |
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117 | elsif (defined($default)) { |
118 | $value = "$attr_var\->{default}"; |
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119 | } |
120 | else { |
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121 | $value = 'undef'; |
ffbbf459 |
122 | } |
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123 | |
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124 | if($need_coercion){ |
125 | $value = "$constraint_var->coerce($value)"; |
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126 | } |
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127 | |
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128 | $code .= "$instance_slot = $value;\n"; |
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129 | } |
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130 | } |
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131 | elsif ($attr->is_required) { |
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132 | $code .= "Carp::confess('Attribute ($key) is required');"; |
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133 | } |
134 | |
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135 | $code .= "}\n" if defined $init_arg; |
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136 | |
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137 | push @res, $code; |
138 | } |
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139 | |
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140 | if($metaclass->is_anon_class){ |
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141 | push @res, q{$instance->{__METACLASS__} = $metaclass;}; |
2efc0af1 |
142 | } |
143 | |
144 | if($has_triggers){ |
145 | unshift @res, q{my @triggers;}; |
146 | push @res, q{$_->[0]->($instance, $_->[1]) for @triggers;}; |
147 | } |
148 | |
149 | return join "\n", @res; |
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150 | } |
151 | |
152 | sub _generate_BUILDARGS { |
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153 | my(undef, $metaclass) = @_; |
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154 | |
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155 | my $class = $metaclass->name; |
156 | if ( $class->can('BUILDARGS') && $class->can('BUILDARGS') != \&Mouse::Object::BUILDARGS ) { |
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157 | return 'my $args = $class->BUILDARGS(@_)'; |
9dcd7d23 |
158 | } |
159 | |
160 | return <<'...'; |
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161 | my $args; |
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162 | if ( scalar @_ == 1 ) { |
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163 | ( ref( $_[0] ) eq 'HASH' ) |
fc1d8369 |
164 | || Carp::confess "Single parameters to new() must be a HASH ref"; |
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165 | $args = +{ %{ $_[0] } }; |
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166 | } |
167 | else { |
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168 | $args = +{@_}; |
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169 | } |
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170 | ... |
171 | } |
172 | |
173 | sub _generate_BUILDALL { |
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174 | my (undef, $metaclass) = @_; |
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175 | |
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176 | return '' unless $metaclass->name->can('BUILD'); |
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177 | |
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178 | my @code; |
179 | for my $class ($metaclass->linearized_isa) { |
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180 | if (get_code_ref($class, 'BUILD')) { |
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181 | unshift @code, qq{${class}::BUILD(\$instance, \$args);}; |
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182 | } |
183 | } |
184 | return join "\n", @code; |
185 | } |
186 | |
187 | 1; |
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188 | __END__ |
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189 | |
190 | =head1 NAME |
191 | |
192 | Mouse::Meta::Method::Constructor - A Mouse method generator for constructors |
193 | |
194 | =head1 VERSION |
195 | |
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196 | This document describes Mouse version 0.40_04 |
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197 | |
198 | =head1 SEE ALSO |
199 | |
200 | L<Moose::Meta::Method::Constructor> |
201 | |
202 | =cut |