use overload '""' => sub { shift->name }, # stringify to tc name
fallback => 1;
-use Carp 'confess';
use Scalar::Util qw(blessed refaddr);
+use Sub::Name qw(subname);
use base qw(Class::MOP::Object);
-our $VERSION = '0.56';
+our $VERSION = '0.93';
+$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
__PACKAGE__->meta->add_attribute('name' => (reader => 'name'));
accessor => 'coercion',
predicate => 'has_coercion'
));
+
__PACKAGE__->meta->add_attribute('hand_optimized_type_constraint' => (
init_arg => 'optimized',
accessor => 'hand_optimized_type_constraint',
sub new {
my $class = shift;
- my $self = $class->_new(@_);
+ my ($first, @rest) = @_;
+ my %args = ref $first ? %$first : $first ? ($first, @rest) : ();
+ $args{name} = $args{name} ? "$args{name}" : "__ANON__";
+
+ my $self = $class->_new(%args);
$self->compile_type_constraint()
unless $self->_has_compiled_type_constraint;
return $self;
}
-sub coerce { ((shift)->coercion || confess "Cannot coerce without a type coercion")->coerce(@_) }
-sub check { $_[0]->_compiled_type_constraint->($_[1]) ? 1 : undef }
+
+
+sub coerce {
+ my $self = shift;
+
+ my $coercion = $self->coercion;
+
+ unless ($coercion) {
+ require Moose;
+ Moose->throw_error("Cannot coerce without a type coercion");
+ }
+
+ return $_[0] if $self->check($_[0]);
+
+ return $coercion->coerce(@_);
+}
+
+sub check {
+ my ($self, @args) = @_;
+ my $constraint_subref = $self->_compiled_type_constraint;
+ return $constraint_subref->(@args) ? 1 : undef;
+}
+
sub validate {
my ($self, $value) = @_;
if ($self->_compiled_type_constraint->($value)) {
}
}
+sub assert_valid {
+ my ($self, $value) = @_;
+
+ my $error = $self->validate($value);
+ return 1 if ! defined $error;
+
+ require Moose;
+ Moose->throw_error($error);
+}
+
sub get_message {
my ($self, $value) = @_;
if (my $msg = $self->message) {
return $msg->($value);
}
else {
- $value = (defined $value ? overload::StrVal($value) : 'undef');
+ $value = (defined $value ? overload::StrVal($value) : 'undef');
return "Validation failed for '" . $self->name . "' failed with value $value";
- }
+ }
}
## type predicates ...
sub equals {
my ( $self, $type_or_name ) = @_;
- my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+ my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
return 1 if refaddr($self) == refaddr($other);
sub is_a_type_of {
my ($self, $type_or_name) = @_;
- my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+ my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
($self->equals($type) || $self->is_subtype_of($type));
}
sub is_subtype_of {
my ($self, $type_or_name) = @_;
- my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+ my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name) or return;
my $current = $self;
if $self->has_hand_optimized_type_constraint;
my $check = $self->constraint;
- (defined $check)
- || confess "Could not compile type constraint '"
+ unless ( defined $check ) {
+ require Moose;
+ Moose->throw_error( "Could not compile type constraint '"
. $self->name
- . "' because no constraint check";
+ . "' because no constraint check" );
+ }
return $self->_compile_subtype($check)
if $self->has_parent;
my $type_constraint = $self->hand_optimized_type_constraint;
- confess unless ref $type_constraint;
+ unless ( ref $type_constraint ) {
+ require Moose;
+ Carp::confess ("Hand optimized type constraint for " . $self->name . " is not a code reference");
+ Moose->throw_error("Hand optimized type constraint is not a code reference");
+ }
return $type_constraint;
}
if ( $check == $null_constraint ) {
return $optimized_parent;
} else {
- return Class::MOP::subname($self->name, sub {
+ return subname($self->name, sub {
return undef unless $optimized_parent->($_[0]);
- local $_ = $_[0];
- $check->($_[0]);
+ my (@args) = @_;
+ local $_ = $args[0];
+ $check->(@args);
});
}
} else {
# general case, check all the constraints, from the first parent to ourselves
my @checks = @parents;
push @checks, $check if $check != $null_constraint;
- return Class::MOP::subname($self->name => sub {
- local $_ = $_[0];
+ return subname($self->name => sub {
+ my (@args) = @_;
+ local $_ = $args[0];
foreach my $check (@checks) {
- return undef unless $check->($_[0]);
+ return undef unless $check->(@args);
}
return 1;
});
return $check if $check == $null_constraint; # Item, Any
- return Class::MOP::subname($self->name => sub {
- local $_ = $_[0];
- $check->($_[0]);
+ return subname($self->name => sub {
+ my (@args) = @_;
+ local $_ = $args[0];
+ $check->(@args);
});
}
return @parents;
}
-## this should get deprecated actually ...
-
-sub union { Carp::croak "DEPRECATED" }
+sub create_child_type {
+ my ($self, %opts) = @_;
+ my $class = ref $self;
+ return $class->new(%opts, parent => $self);
+}
1;
=head1 DESCRIPTION
-For the most part, the only time you will ever encounter an
-instance of this class is if you are doing some serious deep
-introspection. This API should not be considered final, but
-it is B<highly unlikely> that this will matter to a regular
-Moose user.
+This class represents a single type constraint. Moose's built-in type
+constraints, as well as constraints you define, are all store in a
+L<Moose::Meta::TypeConstraint::Registry> object as objects of this
+class.
+
+=head1 INHERITANCE
-If you wish to use features at this depth, please come to the
-#moose IRC channel on irc.perl.org and we can talk :)
+C<Moose::Meta::TypeConstraint> is a subclass of L<Class::MOP::Object>.
=head1 METHODS
=over 4
-=item B<meta>
+=item B<< Moose::Meta::TypeConstraint->new(%options) >>
-=item B<new>
+This creates a new type constraint based on the provided C<%options>:
-=item B<equals ($type_name_or_object)>
+=over 8
-=item B<is_a_type_of ($type_name_or_object)>
+=item * name
-This checks the current type name, and if it does not match,
-checks if it is a subtype of it.
+The constraint name. If a name is not provided, it will be set to
+"__ANON__".
-=item B<is_subtype_of ($type_name_or_object)>
+=item * parent
-=item B<compile_type_constraint>
+A C<Moose::Meta::TypeConstraint> object which is the parent type for
+the type being created. This is optional.
-=item B<coerce ($value)>
+=item * constraint
-This will apply the type-coercion if applicable.
+This is the subroutine reference that implements the actual constraint
+check. This defaults to a subroutine which always returns true.
-=item B<check ($value)>
+=item * message
-This method will return a true (C<1>) if the C<$value> passes the
-constraint, and false (C<0>) otherwise.
+A subroutine reference which is used to generate an error message when
+the constraint fails. This is optional.
-=item B<validate ($value)>
+=item * coercion
-This method is similar to C<check>, but it deals with the error
-message. If the C<$value> passes the constraint, C<undef> will be
-returned. If the C<$value> does B<not> pass the constraint, then
-the C<message> will be used to construct a custom error message.
+A L<Moose::Meta::TypeCoercion> object representing the coercions to
+the type. This is optional.
-=item B<name>
+=item * optimized
-=item B<parent>
+This is a variant of the C<constraint> parameter that is somehow
+optimized. Typically, this means incorporating both the type's
+constraint and all of its parents' constraints into a single
+subroutine reference.
-=item B<has_parent>
+=back
-=item B<parents>
+=item B<< $constraint->equals($type_name_or_object) >>
-=item B<constraint>
+Returns true if the supplied name or type object is the same as the
+current type.
-=item B<has_message>
+=item B<< $constraint->is_subtype_of($type_name_or_object) >>
-=item B<message>
+Returns true if the supplied name or type object is a parent of the
+current type.
-=item B<get_message ($value)>
+=item B<< $constraint->is_a_type_of($type_name_or_object) >>
-=item B<has_coercion>
+Returns true if the given type is the same as the current type, or is
+a parent of the current type. This is a shortcut for checking
+C<equals> and C<is_subtype_of>.
-=item B<coercion>
+=item B<< $constraint->coerce($value) >>
-=item B<hand_optimized_type_constraint>
+This will attempt to coerce the value to the type. If the type does
+have any defined coercions this will throw an error.
-=item B<has_hand_optimized_type_constraint>
+=item B<< $constraint->check($value) >>
-=back
+Returns true if the given value passes the constraint for the type.
-=head2 DEPRECATED METHOD
+=item B<< $constraint->validate($value) >>
-=over 4
+This is similar to C<check>. However, if the type I<is valid> then the
+method returns an explicit C<undef>. If the type is not valid, we call
+C<< $self->get_message($value) >> internally to generate an error
+message.
+
+=item B<< $constraint->assert_valid($value) >>
+
+Like C<check> and C<validate>, this method checks whether C<$value> is
+valid under the constraint. If it is, it will return true. If it is not,
+an exception will be thrown with the results of
+C<< $self->get_message($value) >>.
+
+=item B<< $constraint->name >>
+
+Returns the type's name, as provided to the constructor.
+
+=item B<< $constraint->parent >>
+
+Returns the type's parent, as provided to the constructor, if any.
+
+=item B<< $constraint->has_parent >>
+
+Returns true if the type has a parent type.
+
+=item B<< $constraint->parents >>
+
+A synonym for C<parent>. This is useful for polymorphism with types
+that can have more than one parent.
+
+=item B<< $constraint->constraint >>
+
+Returns the type's constraint, as provided to the constructor.
+
+=item B<< $constraint->get_message($value) >>
+
+This generates a method for the given value. If the type does not have
+an explicit message, we generate a default message.
+
+=item B<< $constraint->has_message >>
+
+Returns true if the type has a message.
+
+=item B<< $constraint->message >>
+
+Returns the type's message as a subroutine reference.
+
+=item B<< $constraint->coercion >>
+
+Returns the type's L<Moose::Meta::TypeCoercion> object, if one
+exists.
+
+=item B<< $constraint->has_coercion >>
+
+Returns true if the type has a coercion.
+
+=item B<< $constraint->hand_optimized_type_constraint >>
+
+Returns the type's hand optimized constraint, as provided to the
+constructor via the C<optimized> option.
+
+=item B<< $constraint->has_hand_optimized_type_constraint >>
+
+Returns true if the type has an optimized constraint.
+
+=item B<< $constraint->create_child_type(%options) >>
-=item B<union>
+This returns a new type constraint of the same class using the
+provided C<%options>. The C<parent> option will be the current type.
-This was just bad idea on my part,.. use the L<Moose::Meta::TypeConstraint::Union>
-itself instead.
+This method exists so that subclasses of this class can override this
+behavior and change how child types are created.
=back
=head1 COPYRIGHT AND LICENSE
-Copyright 2006-2008 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/Moose.git / blobdiff