1 files changed, 87 insertions, 0 deletions
diff --git a/XPath/Number.pm b/XPath/Number.pm
new file mode 100644
index 0000000..74fff2e
--- /dev/null
+++ b/XPath/Number.pm
@@ -0,0 +1,87 @@
+# $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 "<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::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