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<?php
namespace Sudzy;
/**
* Singleton valdation engine
**/
class Engine
{
/**
* Validation methods are stored here so they can easily be overwritten
*/
protected $_checks;
public function __construct()
{
$this->_checks = array(
'required' => array($this, '_required'),
'minLength' => array($this, '_minLength'),
'maxLength' => array($this, '_maxLength'),
'isEmail' => array($this, '_isEmail'),
'isInteger' => array($this, '_isInteger'),
'isNumeric' => array($this, '_isNumeric')
);
}
public function __call($name, $args)
{
if (!isset($this->_checks[$name]))
throw new \InvalidArgumentException("{$name} is not a valid validation function.");
$val = array_shift($args);
$args = array_shift($args);
return call_user_func($this->_checks[$name], $val, $args);
}
public function executeOne($check, $val, $params=array())
{
return call_user_func(__NAMESPACE__ .'\Engine::'.$check, $val, $params);
}
/**
* @param string label used to call function
* @param Callable function with params (value, additional params as array)
*/
public function addValidator($label, $function)
{
if (isset($this->_checks[$label])) throw \Exception();
$this->setValidator($label, $function);
}
public function setValidator($label, $function)
{
$this->_checks[$label] = $function;
}
public function removeValidator($label)
{
unset($this->_checks[$label]);
}
/**
* @return string The list of usable validator methods
*/
public function getValidators()
{
return array_keys($this->_checks);
}
///// Validator methods
protected function _isEmail($val, $params)
{
return FALSE !== filter_var($val, FILTER_VALIDATE_EMAIL);
}
protected function _isInteger($val, $params)
{
if (!is_numeric($val)) return false;
return intval($val) == $val;
}
protected function _isNumeric($val, $params)
{
return is_numeric($val);
}
protected function _minLength($val, $params)
{
$len = array_shift($params);
return strlen($val) >= $len;
}
protected function _maxLength($val, $params)
{
$len = array_shift($params);
return strlen($val) <= $len;
}
protected function _required($val, $params=array())
{
return !(($val === null) || ('' === trim($val)));
}
}
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