-#!/usr/bin/env perl
package Mouse::Meta::Attribute;
use strict;
use warnings;
-require overload;
-use Carp 'confess';
-require Mouse::Util;
+use Mouse::Util;
-sub new {
- my $class = shift;
- my %args = @_;
-
- my $name = $args{name};
-
- $args{init_arg} = $name
- unless exists $args{init_arg};
-
- $args{is} ||= '';
-
- bless \%args, $class;
-}
-
-sub name { $_[0]->{name} }
-sub associated_class { $_[0]->{associated_class} }
-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 trigger { $_[0]->{trigger} }
-sub builder { $_[0]->{builder} }
-sub should_auto_deref { $_[0]->{auto_deref} }
-sub should_coerce { $_[0]->{should_coerce} }
-
-sub has_default { exists $_[0]->{default} }
-sub has_predicate { exists $_[0]->{predicate} }
-sub has_clearer { exists $_[0]->{clearer} }
-sub has_handles { exists $_[0]->{handles} }
-sub has_type_constraint { exists $_[0]->{type_constraint} }
-sub has_trigger { exists $_[0]->{trigger} }
-sub has_builder { exists $_[0]->{builder} }
-
-sub find_type_constraint { $_[0]->{find_type_constraint} }
-sub type_constraint_as_string {
- ref($_[0]->{type_constraint}) eq 'ARRAY' ? join '|', @{ $_[0]->{type_constraint} } : $_[0]->{type_constraint}
-}
-
-sub _create_args {
- $_[0]->{_create_args} = $_[1] if @_ > 1;
- $_[0]->{_create_args}
-}
-
-sub inlined_name {
- my $self = shift;
- my $name = $self->name;
- my $key = "'" . $name . "'";
- return $key;
-}
+use Mouse::Meta::TypeConstraint;
+use Mouse::Meta::Method::Accessor;
-sub generate_accessor {
- my $attribute = shift;
-
- my $name = $attribute->name;
- my $default = $attribute->default;
- my $type = $attribute->type_constraint_as_string;
- 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 (scalar(@_) >= 2) {' . "\n";
-
- my $value = '$_[1]';
-
- if ($constraint) {
- $accessor .= 'my $val = ';
- if ($should_coerce) {
- $accessor .= '$attribute->coerce_constraint('.$value.');';
- } else {
- $accessor .= $value.';';
- }
- $accessor .= 'local $_ = $val;';
- $accessor .= '
- unless ($constraint->()) {
- 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");
- }' . "\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) {
- $accessor .= 'Mouse::Util::weaken('.$self.'->{'.$key.'}) if ref('.$self.'->{'.$key.'});' . "\n";
- }
+sub new {
+ my ($class, $name, %options) = @_;
- if ($trigger) {
- $accessor .= '$trigger->('.$self.', '.$value.', $attribute);' . "\n";
- }
+ $options{name} = $name;
- $accessor .= "}\n";
- }
- else {
- $accessor .= 'confess "Cannot assign a value to a read-only accessor" if scalar(@_) >= 2;' . "\n";
- }
+ $options{init_arg} = $name
+ unless exists $options{init_arg};
- if ($attribute->is_lazy) {
- $accessor .= $self.'->{'.$key.'} = ';
+ my $is = $options{is} ||= '';
- $accessor .= $attribute->has_builder
- ? $self.'->$builder'
- : ref($default) eq 'CODE'
- ? '$default->('.$self.')'
- : '$default';
- $accessor .= ' if !exists '.$self.'->{'.$key.'};' . "\n";
+ if($is eq 'rw'){
+ $options{accessor} = $name if !exists $options{accessor};
}
-
- if ($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.'->{'.$key.'} || {} };
- }';
- }
+ elsif($is eq 'ro'){
+ $options{reader} = $name if !exists $options{reader};
}
- $accessor .= 'return '.$self.'->{'.$key.'};
- }';
-
- my $sub = eval $accessor;
- confess $@ if $@;
- return $sub;
+ bless \%options, $class;
}
-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;
+# 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 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 generate_handles {
- my $attribute = shift;
- my $reader = $attribute->name;
- my %handles = $attribute->_canonicalize_handles($attribute->handles);
-
- my %method_map;
+# predicates
- for my $local_method (keys %handles) {
- my $remote_method = $handles{$local_method};
+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} }
- my $method = 'sub {
- my $self = shift;
- $self->$reader->$remote_method(@_)
- }';
-
- $method_map{$local_method} = eval $method;
- confess $@ if $@;
- }
+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} }
- return \%method_map;
+sub _create_args {
+ $_[0]->{_create_args} = $_[1] if @_ > 1;
+ $_[0]->{_create_args}
}
+sub accessor_metaclass { 'Mouse::Meta::Method::Accessor' }
+
sub create {
my ($self, $class, $name, %args) = @_;
- $args{name} = $name;
+ $args{name} = $name;
$args{associated_class} = $class;
%args = $self->canonicalize_args($name, %args);
if (exists $args{isa}) {
my $type_constraint = delete $args{isa};
- $type_constraint =~ s/\s//g;
- my @type_constraints = split /\|/, $type_constraint;
-
- my $code;
- my $optimized_constraints = Mouse::TypeRegistry->optimized_constraints;
- if (@type_constraints == 1) {
- $code = $optimized_constraints->{$type_constraints[0]} ||
- sub { Mouse::Util::blessed($_) && Mouse::Util::blessed($_) eq $type_constraints[0] };
- $args{type_constraint} = $type_constraints[0];
- } else {
- my @code_list = map {
- my $type = $_;
- $optimized_constraints->{$type} ||
- sub { Mouse::Util::blessed($_) && Mouse::Util::blessed($_) eq $type }
- } @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(%args);
+ my $attribute = $self->new($name, %args);
$attribute->_create_args(\%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';
}
return 1;
}
-sub verify_type_constraint {
- my $self = shift;
- local $_ = shift;
+sub verify_against_type_constraint {
+ my ($self, $value) = @_;
+ my $tc = $self->type_constraint;
+ return 1 unless $tc;
- my $type = $self->type_constraint_as_string
- or return 1;
- my $constraint = $self->find_type_constraint;
+ local $_ = $value;
+ return 1 if $tc->check($value);
- return 1 if $constraint->($_);
+ $self->verify_type_constraint_error($self->name, $value, $tc);
+}
- my $name = $self->name;
- my $display = defined($_) ? overload::StrVal($_) : 'undef';
- Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display");
+sub verify_type_constraint_error {
+ my($self, $name, $value, $type) = @_;
+ $self->throw_error("Attribute ($name) does not pass the type constraint because: " . $type->get_message($value));
}
-sub coerce_constraint {
- my($self, $value) = @_;
- my $type = $self->type_constraint
- or return $value;
- return Mouse::TypeRegistry->typecast_constraints($self->associated_class->name, $self->find_type_constraint, $type, $value);
+sub coerce_constraint { ## my($self, $value) = @_;
+ my $type = $_[0]->{type_constraint}
+ or return $_[1];
+ return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $_[0]->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_type_constraint Item -> 1 | ERROR
+=head2 verify_against_type_constraint Item -> 1 | ERROR
Checks that the given value passes this attribute's type constraint. Returns 1
on success, otherwise C<confess>es.
projects / gitmo/Mouse.git / blobdiff