package Mouse::Meta::Attribute;
use strict;
use warnings;
-require overload;
-use Carp 'confess';
-use Scalar::Util ();
+use Mouse::Meta::TypeConstraint;
+use Mouse::Meta::Method::Accessor;
sub new {
my ($class, $name, %options) = @_;
$options{init_arg} = $name
unless exists $options{init_arg};
- $options{is} ||= '';
+ my $is = $options{is} ||= '';
+
+ if($is eq 'rw'){
+ $options{accessor} = $name if !exists $options{accessor};
+ }
+ elsif($is eq 'ro'){
+ $options{reader} = $name if !exists $options{reader};
+ }
bless \%options, $class;
}
+# readers
+
sub name { $_[0]->{name} }
sub associated_class { $_[0]->{associated_class} }
+
+sub accessor { $_[0]->{accessor} }
+sub reader { $_[0]->{reader} }
+sub writer { $_[0]->{writer} }
+sub predicate { $_[0]->{predicate} }
+sub clearer { $_[0]->{clearer} }
+sub handles { $_[0]->{handles} }
+
sub _is_metadata { $_[0]->{is} }
sub is_required { $_[0]->{required} }
sub default { $_[0]->{default} }
sub is_lazy { $_[0]->{lazy} }
sub is_lazy_build { $_[0]->{lazy_build} }
-sub predicate { $_[0]->{predicate} }
-sub clearer { $_[0]->{clearer} }
-sub handles { $_[0]->{handles} }
sub is_weak_ref { $_[0]->{weak_ref} }
sub init_arg { $_[0]->{init_arg} }
sub type_constraint { $_[0]->{type_constraint} }
+sub find_type_constraint {
+ Carp::carp("This method was deprecated");
+ $_[0]->type_constraint();
+}
sub trigger { $_[0]->{trigger} }
sub builder { $_[0]->{builder} }
sub should_auto_deref { $_[0]->{auto_deref} }
sub should_coerce { $_[0]->{should_coerce} }
-sub find_type_constraint { $_[0]->{find_type_constraint} }
-sub has_default { exists $_[0]->{default} }
+# predicates
+
+sub has_accessor { exists $_[0]->{accessor} }
+sub has_reader { exists $_[0]->{reader} }
+sub has_writer { exists $_[0]->{writer} }
sub has_predicate { exists $_[0]->{predicate} }
sub has_clearer { exists $_[0]->{clearer} }
sub has_handles { exists $_[0]->{handles} }
+
+sub has_default { exists $_[0]->{default} }
sub has_type_constraint { exists $_[0]->{type_constraint} }
sub has_trigger { exists $_[0]->{trigger} }
sub has_builder { exists $_[0]->{builder} }
$_[0]->{_create_args}
}
-sub inlined_name {
- my $self = shift;
- my $name = $self->name;
- my $key = "'" . $name . "'";
- return $key;
-}
-
-sub generate_accessor {
- my $attribute = shift;
-
- my $name = $attribute->name;
- my $default = $attribute->default;
- my $constraint = $attribute->find_type_constraint;
- my $builder = $attribute->builder;
- my $trigger = $attribute->trigger;
- my $is_weak = $attribute->is_weak_ref;
- my $should_deref = $attribute->should_auto_deref;
- my $should_coerce = $attribute->should_coerce;
-
- my $self = '$_[0]';
- my $key = $attribute->inlined_name;
-
- my $accessor = "sub {\n";
- if ($attribute->_is_metadata eq 'rw') {
- $accessor .= 'if (@_ >= 2) {' . "\n";
-
- my $value = '$_[1]';
-
- if ($constraint) {
- $accessor .= 'my $val = ';
- if ($should_coerce) {
- $accessor .= 'Mouse::Util::TypeConstraints->typecast_constraints("'.$attribute->associated_class->name.'", $attribute->{find_type_constraint}, $attribute->{type_constraint}, '.$value.');';
- } else {
- $accessor .= $value.';';
- }
- $accessor .= 'local $_ = $val;';
- $accessor .= '
- unless ($constraint->()) {
- $attribute->verify_type_constraint_error($name, $_, $attribute->type_constraint);
- }' . "\n";
- $value = '$val';
- }
-
- # if there's nothing left to do for the attribute we can return during
- # this setter
- $accessor .= 'return ' if !$is_weak && !$trigger && !$should_deref;
-
- $accessor .= $self.'->{'.$key.'} = '.$value.';' . "\n";
-
- if ($is_weak) {
- $accessor .= 'Scalar::Util::weaken('.$self.'->{'.$key.'}) if ref('.$self.'->{'.$key.'});' . "\n";
- }
-
- if ($trigger) {
- $accessor .= '$trigger->('.$self.', '.$value.', $attribute);' . "\n";
- }
-
- $accessor .= "}\n";
- }
- else {
- $accessor .= 'confess "Cannot assign a value to a read-only accessor" if scalar(@_) >= 2;' . "\n";
- }
-
- if ($attribute->is_lazy) {
- $accessor .= $self.'->{'.$key.'} = ';
-
- $accessor .= $attribute->has_builder
- ? $self.'->$builder'
- : ref($default) eq 'CODE'
- ? '$default->('.$self.')'
- : '$default';
- $accessor .= ' if !exists '.$self.'->{'.$key.'};' . "\n";
- }
-
- if ($should_deref) {
- my $type_constraint = $attribute->type_constraint;
- if (!ref($type_constraint) && $type_constraint eq 'ArrayRef') {
- $accessor .= 'if (wantarray) {
- return @{ '.$self.'->{'.$key.'} || [] };
- }';
- }
- else {
- $accessor .= 'if (wantarray) {
- return %{ '.$self.'->{'.$key.'} || {} };
- }';
- }
- }
-
- $accessor .= 'return '.$self.'->{'.$key.'};
- }';
-
- my $sub = eval $accessor;
- confess $@ if $@;
- return $sub;
-}
-
-sub generate_predicate {
- my $attribute = shift;
- my $key = $attribute->inlined_name;
-
- my $predicate = 'sub { exists($_[0]->{'.$key.'}) }';
-
- my $sub = eval $predicate;
- confess $@ if $@;
- return $sub;
-}
-
-sub generate_clearer {
- my $attribute = shift;
- my $key = $attribute->inlined_name;
-
- my $clearer = 'sub { delete($_[0]->{'.$key.'}) }';
-
- my $sub = eval $clearer;
- confess $@ if $@;
- return $sub;
-}
-
-sub generate_handles {
- my $attribute = shift;
- my $reader = $attribute->name;
- my %handles = $attribute->_canonicalize_handles($attribute->handles);
-
- my %method_map;
-
- for my $local_method (keys %handles) {
- my $remote_method = $handles{$local_method};
-
- my $method = 'sub {
- my $self = shift;
- $self->'.$reader.'->'.$remote_method.'(@_)
- }';
-
- $method_map{$local_method} = eval $method;
- confess $@ if $@;
- }
-
- return \%method_map;
-}
-
-our $optimized_constraints;
-sub _build_type_constraint {
- my $spec = shift;
- local $optimized_constraints ||= Mouse::Util::TypeConstraints->optimized_constraints;
- my $code;
- if ($spec =~ /^([^\[]+)\[(.+)\]$/) {
- # parameterized
- my $constraint = $1;
- my $param = $2;
- my $parent = _build_type_constraint($constraint);
- my $child = _build_type_constraint($param);
- if ($constraint eq 'ArrayRef') {
- my $code_str =
- "sub {\n" .
- " if (\$parent->(\$_)) {\n" .
- " foreach my \$e (@\$_) {\n" .
- " local \$_ = \$e;\n" .
- " return () unless \$child->(\$_);\n" .
- " }\n" .
- " return 1;\n" .
- " }\n" .
- " return ();\n" .
- "};\n"
- ;
- $code = eval $code_str or Carp::confess($@);
- } elsif ($constraint eq 'HashRef') {
- my $code_str =
- "sub {\n" .
- " if (\$parent->(\$_)) {\n" .
- " foreach my \$e (values %\$_) {\n" .
- " local \$_ = \$e;\n" .
- " return () unless \$child->(\$_);\n" .
- " }\n" .
- " return 1;\n" .
- " }\n" .
- " return ();\n" .
- "};\n"
- ;
- $code = eval $code_str or Carp::confess($@);
- } else {
- Carp::confess("Support for parameterized types other than ArrayRef or HashRef is not implemented yet");
- }
- } else {
- $code = $optimized_constraints->{ $spec };
- if (! $code) {
- $code = sub { Scalar::Util::blessed($_) && $_->isa($spec) };
- $optimized_constraints->{$spec} = $code;
- }
- }
- return $code;
-}
+sub accessor_metaclass { 'Mouse::Meta::Method::Accessor' }
sub create {
my ($self, $class, $name, %args) = @_;
- $args{name} = $name;
+ $args{name} = $name;
$args{associated_class} = $class;
%args = $self->canonicalize_args($name, %args);
if exists $args{coerce};
if (exists $args{isa}) {
- warn "Got isa => $args{isa}, but Mouse does not yet support parameterized types for containers other than ArrayRef and HashRef (rt.cpan.org #39795)"
- if $args{isa} =~ /^([^\[]+)\[.+\]$/ &&
- $1 ne 'ArrayRef' &&
- $1 ne 'HashRef';
-
my $type_constraint = delete $args{isa};
- $type_constraint =~ s/\s//g;
- my @type_constraints = split /\|/, $type_constraint;
-
- my $code;
- if (@type_constraints == 1) {
- $code = _build_type_constraint($type_constraints[0]);
- $args{type_constraint} = $type_constraints[0];
- } else {
- my @code_list = map {
- _build_type_constraint($_)
- } @type_constraints;
- $code = sub {
- for my $code (@code_list) {
- return 1 if $code->();
- }
- return 0;
- };
- $args{type_constraint} = \@type_constraints;
- }
- $args{find_type_constraint} = $code;
+ $args{type_constraint}= Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($type_constraint);
}
my $attribute = $self->new($name, %args);
$class->add_attribute($attribute);
- # install an accessor
- if ($attribute->_is_metadata eq 'rw' || $attribute->_is_metadata eq 'ro') {
- my $accessor = $attribute->generate_accessor;
- $class->add_method($name => $accessor);
- }
+ my $associated_methods = 0;
- for my $method (qw/predicate clearer/) {
- my $predicate = "has_$method";
- if ($attribute->$predicate) {
- my $generator = "generate_$method";
- my $coderef = $attribute->$generator;
- $class->add_method($attribute->$method => $coderef);
+ my $generator_class = $self->accessor_metaclass;
+ foreach my $type(qw(accessor reader writer predicate clearer handles)){
+ if(exists $attribute->{$type}){
+ my $installer = '_install_' . $type;
+ $generator_class->$installer($attribute, $attribute->{$type}, $class);
+ $associated_methods++;
}
}
- if ($attribute->has_handles) {
- my $method_map = $attribute->generate_handles;
- for my $method_name (keys %$method_map) {
- $class->add_method($method_name => $method_map->{$method_name});
- }
+ if($associated_methods == 0 && ($attribute->_is_metadata || '') ne 'bare'){
+ Carp::cluck(qq{Attribute ($name) of class }.$class->name.qq{ has no associated methods (did you mean to provide an "is" argument?)});
+
}
return $attribute;
my $name = shift;
my $args = shift;
- confess "You can not use lazy_build and default for the same attribute ($name)"
+ $self->throw_error("You can not use lazy_build and default for the same attribute ($name)")
if $args->{lazy_build} && exists $args->{default};
- confess "You cannot have lazy attribute ($name) without specifying a default value for it"
+ $self->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it")
if $args->{lazy}
&& !exists($args->{default})
&& !exists($args->{builder});
- confess "References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])"
+ $self->throw_error("References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])")
if ref($args->{default})
&& ref($args->{default}) ne 'CODE';
- confess "You cannot auto-dereference without specifying a type constraint on attribute ($name)"
+ $self->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)")
if $args->{auto_deref} && !exists($args->{isa});
- confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)"
+ $self->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)")
if $args->{auto_deref}
- && $args->{isa} ne 'ArrayRef'
- && $args->{isa} ne 'HashRef';
+ && $args->{isa} !~ /^(?:ArrayRef|HashRef)(?:\[.*\])?$/;
if ($args->{trigger}) {
if (ref($args->{trigger}) eq 'HASH') {
- Carp::carp "HASH-based form of trigger has been removed. Only the coderef form of triggers are now supported.";
+ $self->throw_error("HASH-based form of trigger has been removed. Only the coderef form of triggers are now supported.");
}
- confess "Trigger must be a CODE ref on attribute ($name)"
+ $self->throw_error("Trigger must be a CODE ref on attribute ($name)")
if ref($args->{trigger}) ne 'CODE';
}
}
sub verify_against_type_constraint {
- return 1 unless $_[0]->{type_constraint};
+ my ($self, $value) = @_;
+ my $tc = $self->type_constraint;
+ return 1 unless $tc;
- local $_ = $_[1];
- return 1 if $_[0]->{find_type_constraint}->($_);
+ local $_ = $value;
+ return 1 if $tc->check($value);
- my $self = shift;
- $self->verify_type_constraint_error($self->name, $_, $self->type_constraint);
+ $self->verify_type_constraint_error($self->name, $value, $tc);
}
sub verify_type_constraint_error {
my($self, $name, $value, $type) = @_;
- $type = ref($type) eq 'ARRAY' ? join '|', @{ $type } : $type;
- my $display = defined($_) ? overload::StrVal($_) : 'undef';
- Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display");
+ $self->throw_error("Attribute ($name) does not pass the type constraint because: " . $type->get_message($value));
}
sub coerce_constraint { ## my($self, $value) = @_;
my $type = $_[0]->{type_constraint}
or return $_[1];
- return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $_[0]->find_type_constraint, $type, $_[1]);
+ return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $_[0]->type_constraint, $_[1]);
}
sub _canonicalize_handles {
return map { $_ => $_ } @$handles;
}
else {
- confess "Unable to canonicalize the 'handles' option with $handles";
+ $self->throw_error("Unable to canonicalize the 'handles' option with $handles");
}
}
return %{ $super_attr->_create_args };
}
- confess "Could not find an attribute by the name of '$name' to inherit from";
+ $self->throw_error("Could not find an attribute by the name of '$name' to inherit from");
+}
+
+sub throw_error{
+ my $self = shift;
+
+ my $metaclass = (ref $self && $self->associated_class) || 'Mouse::Meta::Class';
+ $metaclass->throw_error(@_, depth => 1);
}
1;
Informational methods.
-=head2 generate_accessor -> CODE
-
-Creates a new code reference for the attribute's accessor.
-
-=head2 generate_predicate -> CODE
-
-Creates a new code reference for the attribute's predicate.
-
-=head2 generate_clearer -> CODE
-
-Creates a new code reference for the attribute's clearer.
-
-=head2 generate_handles -> { MethodName => CODE }
-
-Creates a new code reference for each of the attribute's handles methods.
-
-=head2 find_type_constraint -> CODE
-
-Returns a code reference which can be used to check that a given value passes
-this attribute's type constraint;
-
=head2 verify_against_type_constraint Item -> 1 | ERROR
Checks that the given value passes this attribute's type constraint. Returns 1