Current File : //usr/share/perl5/XML/XPathEngine/Number.pm
# $Id: Number.pm,v 1.14 2002/12/26 17:57:09 matt Exp $
package XML::XPathEngine::Number;
use XML::XPathEngine::Boolean;
use XML::XPathEngine::Literal;
use strict;
use overload
'""' => \&value,
'<=>' => \&cmp;
sub new {
my $class = shift;
my $number = shift;
if ($number !~ /^\s*[+-]?(\d+(\.\d*)?|\.\d+)\s*$/) {
$number = undef;
}
else {
$number =~ s/^\s*(.*)\s*$/$1/;
}
bless \$number, $class;
}
sub as_string {
my $self = shift;
defined $$self ? $$self : 'NaN';
}
sub as_xml {
my $self = shift;
return "<Number>" . (defined($$self) ? $$self : 'NaN') . "</Number>\n";
}
sub value {
my $self = shift;
$$self;
}
sub cmp {
my $self = shift;
my ($other, $swap) = @_;
if ($swap) {
return $other <=> $$self;
}
return $$self <=> $other;
}
sub evaluate {
my $self = shift;
$self;
}
sub to_boolean {
my $self = shift;
return $$self ? XML::XPathEngine::Boolean->True : XML::XPathEngine::Boolean->False;
}
sub to_literal { XML::XPathEngine::Literal->new($_[0]->as_string); }
sub to_number { $_[0]; }
sub string_value { return $_[0]->value }
sub getChildNodes { return wantarray ? () : []; }
sub getAttributes { return wantarray ? () : []; }
1;
__END__
=head1 NAME
XML::XPathEngine::Number - Simple numeric values.
=head1 DESCRIPTION
This class holds simple numeric values. It doesn't support -0, +/- Infinity,
or NaN, as the XPath spec says it should, but I'm not hurting anyone I don't think.
=head1 API
=head2 new($num)
Creates a new XML::XPathEngine::Number object, with the value in $num. Does some
rudimentary numeric checking on $num to ensure it actually is a number.
=head2 value()
Also as overloaded stringification. Returns the numeric value held.
=cut
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