Support-Groups/admin/helpers/negativefinder.php

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<?php
/**
*
* @version 1.0.0
* @package Detecting negative numbers
* @license GNU General Public License <http://www.gnu.org/copyleft/gpl.html>
*
**/
// No direct access.
defined('_JEXEC') or die;
/**
* Detecting negative numbers
**/
class Expression
{
protected $expression;
protected $result;
public function __construct($expression)
{
$this->expression = $expression;
}
public function evaluate()
{
$this->result = eval("return ".$this->expression.";");
return $this;
}
public function getResult()
{
return $this->result;
}
}
class NegativeFinder
{
protected $expressionObj;
public function __construct(Expression $expressionObj)
{
$this->expressionObj = $expressionObj;
}
public function isItNegative()
{
$result = $this->expressionObj->evaluate()->getResult();
if($this->hasMinusSign($result))
{
return true;
}
else
{
return false;
}
}
protected function hasMinusSign($value)
{
return (substr(strval($value), 0, 1) == "-");
}
}