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# $Id: Boolean.pm,v 1.7 2000/07/03 08:54:47 matt Exp $
package XML::XPathEngine::Boolean;
use XML::XPathEngine::Number;
use XML::XPathEngine::Literal;
use strict;
use overload
                '""' => \&value,
                '<=>' => \&cmp;
sub True {
        my $class = shift;
        my $val = 1;
        bless \$val, $class;
}
sub False {
        my $class = shift;
        my $val = 0;
        bless \$val, $class;
}
sub value {
        my $self = shift;
        $$self;
}
sub cmp {
        my $self = shift;
        my ($other, $swap) = @_;
        if ($swap) {
                return $other <=> $$self;
        }
        return $$self <=> $other;
}
sub to_number { XML::XPathEngine::Number->new($_[0]->value); }
sub to_boolean { $_[0]; }
sub to_literal { XML::XPathEngine::Literal->new($_[0]->value ? "true" : "false"); }
sub string_value { return $_[0]->to_literal->value; }
sub getChildNodes { return wantarray ? () : []; }
sub getAttributes { return wantarray ? () : []; }
1;
__END__
HideShow 28 lines of Pod
=head1 NAME
XML::XPathEngine::Boolean - Boolean true/false values
=head1 DESCRIPTION
XML::XPathEngine::Boolean objects implement simple boolean true/false objects.
=head1 API
=head2 XML::XPathEngine::Boolean->True
Creates a new Boolean object with a true value.
=head2 XML::XPathEngine::Boolean->False
Creates a new Boolean object with a false value.
=head2 value()
Returns true or false.
=head2 to_literal()
Returns the string "true" or "false".
=cut