<?vsp 
--  
--  $Id$
--  
--  This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
--  project.
--  
--  Copyright (C) 1998-2018 OpenLink Software
--  
--  This project 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; only version 2 of the License, dated June 1991.
--  
--  This program is distributed in the hope that it will be useful, but
--  WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
--  General Public License for more details.
--  
--  You should have received a copy of the GNU General Public License along
--  with this program; if not, write to the Free Software Foundation, Inc.,
--  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
--  
--  
?>
<!--
    Calculator example
    This example demonstrates using the VSP parameters from a form posting
    and SQL error handlers
 -->
<?vsp
 declare number1, number2, result float;
 declare operation,thisvsp varchar;

 declare exit handler for sqlstate '*' { result := concat ('Error: ', __SQL_MESSAGE); number1 := 0; number2 := 0;  goto error; };

 thisvsp := aref(path,length(path)-1);
 number1 := atod (get_keyword ('number1', params, '0'));
 number2 := atod (get_keyword ('number2', params, '0'));
 operation := get_keyword ('operation', params, '?');
 if (get_keyword ('execute', params, '') <> '')
    result := case when operation = '+' then number1 + number2
                when operation = '-' then number1 - number2
                when operation = '*' then number1 * number2
                when operation = '/' then number1 / number2
		else 'Error' end;
  else
    result := 0;

 if (get_keyword ('reset', params, '') <> '')
   {
     number1 := 0;
     number2 := 0;
   }

error:

?>
<HTML>
<head><link rel="stylesheet" type="text/css" href="../demo.css"></head>
<BODY>
<H2>Simple calculator</H2>
<p>Errors such as divide by zero will be trapped.</p>
<form method="POST" action="<?=thisvsp?>">
<table class="tableentry">
  <tr>
    <td>1. enter number</td>
    <td align="right"><input type="text" name="number1" value="<?=number1?>"></td>
  </tr>
  <tr>
    <td>2. pick operation</td>
    <td align="right">
      <select name="operation">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="/">/</option>
      </select>
    </td>
  </tr>
  <tr>
    <td>3. enter number</td>
    <td align="right"><input type="text" name="number2" value="<?=number2?>"></td>
  </tr>
  <tr>
    <td>4. hit "="</td>
    <td align="right"><input type="submit" value="=" name="execute"><input type="submit" value="C" name="reset"></td>
  </tr>
  <tr>
    <td>5. Get result</td>
    <td align="right"><b><?=result?></b></td>
  </tr>
</table>
</form>
</BODY>
</HTML>
