# $Id: Number.pm,v 1.14 2002/12/26 17:57:09 matt Exp $ package XML::XPath::Number; use XML::XPath::Boolean; use XML::XPath::Literal; use strict; use overload '""' => \&value, '0+' => \&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 "" . (defined($$self) ? $$self : 'NaN') . "\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::XPath::Boolean->True : XML::XPath::Boolean->False; } sub to_literal { XML::XPath::Literal->new($_[0]->as_string); } sub to_number { $_[0]; } sub string_value { return $_[0]->value } 1; __END__ =head1 NAME XML::XPath::Number - Simple numeric values. =head1 DESCRIPTION This class holds simple numeric values. It doesn't support -0, +/- Infinity, or NaN, as the XPath spec says it should, but I'm not hurting anyone I don't think. =head1 API =head2 new($num) Creates a new XML::XPath::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