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# You may distribute under the terms of either the GNU General Public License
# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2011-2024 -- leonerd@leonerd.org.uk
use v5.26;
use warnings;
use Object::Pad 0.800;
package Tangence::Meta::Property 0.33;
class Tangence::Meta::Property :strict(params);
use Syntax::Keyword::Match;
use Tangence::Constants;
=head1 NAME
C<Tangence::Meta::Property> - structure representing one C<Tangence> property
=head1 DESCRIPTION
This data structure object stores information about one L<Tangence> class
property. Once constructed, such objects are immutable.
=cut
=head1 CONSTRUCTOR
=cut
=head2 new
$property = Tangence::Meta::Property->new( %args )
Returns a new instance initialised by the given arguments.
=over 8
=item class => Tangence::Meta::Class
Reference to the containing class
=item name => STRING
Name of the property
=item dimension => INT
Dimension of the property, as one of the C<DIM_*> constants from
L<Tangence::Constants>.
=item type => STRING
The element type as a L<Tangence::Meta::Type> reference.
=item smashed => BOOL
Optional. If true, marks that the property is smashed.
=back
=cut
field $class :param :weak :reader;
field $name :param :reader;
field $dimension :param :reader;
field $type :param :reader;
field $smashed :param :reader = 0;
=head1 ACCESSORS
=cut
=head2 class
$class = $property->class
Returns the class the property is a member of
=cut
=head2 name
$name = $property->name
Returns the name of the class
=cut
=head2 dimension
$dimension = $property->dimension
Returns the dimension as one of the C<DIM_*> constants.
=cut
=head2 type
$type = $property->type
Returns the element type as a L<Tangence::Meta::Type> reference.
=cut
=head2 overall_type
$type = $property->overall_type
Returns the type of the entire collection as a L<Tangence::Meta::Type>
reference. For scalar types this will be the element type. For dict types this
will be a hash of the array type. For array, queue and objset types this will
a list of the element type.
=cut
field $_overall_type;
method overall_type
{
return $_overall_type ||= do {
my $type = $self->type;
my $dim = $self->dimension;
match( $dim : == ) {
case( DIM_SCALAR ) {
$type;
}
case( DIM_HASH ) {
$self->make_type( dict => $type );
}
case( DIM_ARRAY ), case( DIM_QUEUE ), case( DIM_OBJSET ) {
$self->make_type( list => $type );
}
default {
die "Unrecognised dimension $dim for ->overall_type";
}
}
}
}
=head2 smashed
$smashed = $property->smashed
Returns true if the property is smashed.
=cut
# For subclasses to override if required
method make_type
{
return Tangence::Meta::Type->make( @_ );
}
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
=cut
0x55AA;
|
