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# 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.
CodeDef natural OrderCheck
CodeDef natural Description Natural number
CodeDef natural Routine <<EOR
sub {
my ($ref, $name, $value, $code) = @_;
if ($value and $value > 0 and "$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');
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