# Copyright 2005-2007 Interchange Development Group and others

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version. See the LICENSE file for details.

#

# $Id: natural.oc,v 1.3 2007-03-30 23:40:48 pajamian Exp $

CodeDef natural OrderCheck

CodeDef natural Description Natural number

CodeDef natural Routine <<EOR

sub {

my ($ref, $name, $value, $code) = @_;

if ($value && $value eq int($value)) {

return (1, $name, '');

}

$code =~ s/\\/\\\\/g;

$code =~ s/^\s*(["'])(.+?)\1$/$2/;

if ($code =~ /\S/) {

return (0, $name, $code);

} else {

return (0, $name, 'no natural number');

}

}

EOR