package Mouse::Meta::Method::Constructor;
-use strict;
-use warnings;
-
-sub generate_constructor_method_inline {
- my ($class, $meta) = @_;
-
- my @attrs = $meta->compute_all_applicable_attributes;
- my $buildall = $class->_generate_BUILDALL($meta);
- my $buildargs = $class->_generate_BUILDARGS($meta);
- my $processattrs = $class->_generate_processattrs($meta, \@attrs);
-
- my $code = <<"...";
- sub {
- my \$class = shift;
- my \$args = $buildargs;
- my \$instance = bless {}, \$class;
- $processattrs;
- $buildall;
- return \$instance;
- }
-...
+use Mouse::Util qw(:meta); # enables strict and warnings
+
+sub _inline_slot{
+ my(undef, $self_var, $attr_name) = @_;
+ return sprintf '%s->{q{%s}}', $self_var, $attr_name;
+}
- local $@;
- my $res = eval $code;
- die $@ if $@;
- $res;
+sub _generate_constructor {
+ my ($class, $metaclass, $args) = @_;
+
+ my $associated_metaclass_name = $metaclass->name;
+
+ my @attrs = $metaclass->get_all_attributes;
+
+ my $buildall = $class->_generate_BUILDALL($metaclass);
+ my $buildargs = $class->_generate_BUILDARGS($metaclass);
+ my $processattrs = $class->_generate_processattrs($metaclass, \@attrs);
+
+ my @checks = map { $_ && $_->_compiled_type_constraint }
+ map { $_->type_constraint } @attrs;
+
+ my $source = sprintf("#line %d %s\n", __LINE__, __FILE__).<<"...";
+ sub \{
+ my \$class = shift;
+ return \$class->Mouse::Object::new(\@_)
+ if \$class ne q{$associated_metaclass_name};
+ # BUILDARGS
+ $buildargs;
+ my \$instance = bless {}, \$class;
+ # process attributes
+ $processattrs;
+ # BUILDALL
+ $buildall;
+ return \$instance;
+ }
+...
+ #warn $source;
+ my $code;
+ my $e = do{
+ local $@;
+ $code = eval $source;
+ $@;
+ };
+ die $e if $e;
+ return $code;
}
sub _generate_processattrs {
- my ($class, $meta, $attrs) = @_;
+ my ($method_class, $metaclass, $attrs) = @_;
my @res;
+ my $has_triggers;
+ my $strict_constructor = $metaclass->__strict_constructor;
+
+
+ if($strict_constructor){
+ push @res, 'my $used = 0;';
+ }
+
for my $index (0 .. @$attrs - 1) {
+ my $code = '';
+
my $attr = $attrs->[$index];
my $key = $attr->name;
- my $code = '';
- if (defined $attr->init_arg) {
- my $from = $attr->init_arg;
+ my $init_arg = $attr->init_arg;
+ my $type_constraint = $attr->type_constraint;
+ my $is_weak_ref = $attr->is_weak_ref;
+ my $need_coercion;
- $code .= "if (exists \$args->{'$from'}) {\n";
+ my $instance_slot = $method_class->_inline_slot('$instance', $key);
+ my $attr_var = "\$attrs[$index]";
+ my $constraint_var;
- if ($attr->should_coerce && $attr->type_constraint) {
- $code .= "my \$value = Mouse::Util::TypeConstraints->typecast_constraints('".$attr->associated_class->name."', \$attrs[$index]->{find_type_constraint}, \$attrs[$index]->{type_constraint}, \$args->{'$from'});\n";
- }
- else {
- $code .= "my \$value = \$args->{'$from'};\n";
- }
+ if(defined $type_constraint){
+ $constraint_var = "$attr_var\->{type_constraint}";
+ $need_coercion = ($attr->should_coerce && $type_constraint->has_coercion);
+ }
- if ($attr->has_type_constraint) {
- $code .= "{
- local \$_ = \$value;
- unless (\$attrs[$index]->{find_type_constraint}->(\$_)) {
- \$attrs[$index]->verify_type_constraint_error('$key', \$_, \$attrs[$index]->type_constraint)
- }
- }";
- }
+ $code .= "# initialize $key\n";
+
+ my $post_process = '';
+ if(defined $type_constraint){
+ $post_process .= "\$checks[$index]->($instance_slot)";
+ $post_process .= " or $attr_var->_throw_type_constraint_error($instance_slot, $constraint_var);\n";
+ }
+ if($is_weak_ref){
+ $post_process .= "Scalar::Util::weaken($instance_slot) if ref $instance_slot;\n";
+ }
- $code .= "\$instance->{'$key'} = \$value;\n";
+ if (defined $init_arg) {
+ my $value = "\$args->{q{$init_arg}}";
- if ($attr->is_weak_ref) {
- $code .= "Scalar::Util::weaken( \$instance->{'$key'} ) if ref( \$value );\n";
+ $code .= "if (exists $value) {\n";
+
+ if($need_coercion){
+ $value = "$constraint_var->coerce($value)";
}
+ $code .= "$instance_slot = $value;\n";
+ $code .= $post_process;
+
if ($attr->has_trigger) {
- $code .= "\$attrs[$index]->{trigger}->( \$instance, \$value );\n";
+ $has_triggers++;
+ $code .= "push \@triggers, [$attr_var\->{trigger}, $instance_slot];\n";
+ }
+
+ if ($strict_constructor){
+ $code .= '$used++;' . "\n";
}
- $code .= "\n} else {\n";
+ $code .= "\n} else {\n"; # $value exists
}
if ($attr->has_default || $attr->has_builder) {
my $default = $attr->default;
my $builder = $attr->builder;
- $code .= "my \$value = ";
-
- if ($attr->should_coerce && $attr->type_constraint) {
- $code .= "Mouse::Util::TypeConstraints->typecast_constraints('".$attr->associated_class->name."', \$attrs[$index]->{find_type_constraint}, \$attrs[$index]->{type_constraint}, ";
+ my $value;
+ if (defined($builder)) {
+ $value = "\$instance->$builder()";
}
-
- if ($attr->has_builder) {
- $code .= "\$instance->$builder";
- }
- elsif (ref($default) eq 'CODE') {
- $code .= "\$attrs[$index]->{default}->(\$instance)";
- }
- elsif (!defined($default)) {
- $code .= 'undef';
- }
- elsif ($default =~ /^\-?[0-9]+(?:\.[0-9]+)$/) {
- $code .= $default;
- }
- else {
- $code .= "'$default'";
- }
-
- if ($attr->should_coerce) {
- $code .= ");\n";
+ elsif (ref($default) eq 'CODE') {
+ $value = "$attr_var\->{default}->(\$instance)";
+ }
+ elsif (defined($default)) {
+ $value = "$attr_var\->{default}";
}
else {
- $code .= ";\n";
+ $value = 'undef';
}
- if ($attr->has_type_constraint) {
- $code .= "{
- local \$_ = \$value;
- unless (\$attrs[$index]->{find_type_constraint}->(\$_)) {
- \$attrs[$index]->verify_type_constraint_error('$key', \$_, \$attrs[$index]->type_constraint)
- }
- }";
+ if($need_coercion){
+ $value = "$constraint_var->coerce($value)";
}
- $code .= "\$instance->{'$key'} = \$value;\n";
-
- if ($attr->is_weak_ref) {
- $code .= "Scalar::Util::weaken( \$instance->{'$key'} ) if ref( \$value );\n";
+ $code .= "$instance_slot = $value;\n";
+ if($is_weak_ref){
+ $code .= "Scalar::Util::weaken($instance_slot);\n";
}
}
}
$code .= "Carp::confess('Attribute ($key) is required');";
}
- $code .= "}\n" if defined $attr->init_arg;
+ $code .= "}\n" if defined $init_arg;
push @res, $code;
}
+ if($strict_constructor){
+ push @res, q{if($used < keys %{$args})}
+ . q{{ Mouse::Meta::Method::Constructor::_report_unknown_args($metaclass, \@attrs, $instance, $args) }};
+ }
+
+ if($metaclass->is_anon_class){
+ push @res, q{$instance->{__METACLASS__} = $metaclass;};
+ }
+
+ if($has_triggers){
+ unshift @res, q{my @triggers;};
+ push @res, q{$_->[0]->($instance, $_->[1]) for @triggers;};
+ }
+
return join "\n", @res;
}
sub _generate_BUILDARGS {
- my $self = shift;
- my $meta = shift;
+ my(undef, $metaclass) = @_;
- if ($meta->name->can('BUILDARGS') && $meta->name->can('BUILDARGS') != Mouse::Object->can('BUILDARGS')) {
- return '$class->BUILDARGS(@_)';
+ my $class = $metaclass->name;
+ if ( $class->can('BUILDARGS') && $class->can('BUILDARGS') != \&Mouse::Object::BUILDARGS ) {
+ return 'my $args = $class->BUILDARGS(@_)';
}
return <<'...';
- do {
+ my $args;
if ( scalar @_ == 1 ) {
- if ( defined $_[0] ) {
- ( ref( $_[0] ) eq 'HASH' )
+ ( ref( $_[0] ) eq 'HASH' )
|| Carp::confess "Single parameters to new() must be a HASH ref";
- +{ %{ $_[0] } };
- }
- else {
- +{};
- }
+ $args = +{ %{ $_[0] } };
}
else {
- +{@_};
+ $args = +{@_};
}
- };
...
}
sub _generate_BUILDALL {
- my ($class, $meta) = @_;
- return '' unless $meta->name->can('BUILD');
-
- my @code = ();
- push @code, q{no strict 'refs';};
- push @code, q{no warnings 'once';};
- no strict 'refs';
- no warnings 'once';
- for my $klass ($meta->linearized_isa) {
- if (*{ $klass . '::BUILD' }{CODE}) {
- push @code, qq{${klass}::BUILD(\$instance, \$args);};
+ my (undef, $metaclass) = @_;
+
+ return '' unless $metaclass->name->can('BUILD');
+
+ my @code;
+ for my $class ($metaclass->linearized_isa) {
+ if (Mouse::Util::get_code_ref($class, 'BUILD')) {
+ unshift @code, qq{${class}::BUILD(\$instance, \$args);};
}
}
return join "\n", @code;
}
+sub _report_unknown_args {
+ my($metaclass, $attrs, $instance, $args) = @_;
+
+ my @unknowns;
+ my %init_args;
+ foreach my $attr(@{$attrs}){
+ my $init_arg = $attr->init_arg;
+ if(defined $init_arg){
+ $init_args{$init_arg}++;
+ }
+ }
+
+ while(my $key = each %{$args}){
+ if(!exists $init_args{$key}){
+ push @unknowns, $key;
+ }
+ }
+
+ $metaclass->throw_error( sprintf
+ "Unknown attribute passed to the constructor of %s: %s",
+ ref($instance), join ', ', @unknowns
+ );
+}
+
1;
+__END__
+
+=head1 NAME
+
+Mouse::Meta::Method::Constructor - A Mouse method generator for constructors
+
+=head1 VERSION
+
+This document describes Mouse version 0.50_01
+
+=head1 SEE ALSO
+
+L<Moose::Meta::Method::Constructor>
+
+=cut
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