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File: phon/PHONEvaluator.php


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  Classes of Martin Alterisio  >  PHON  >  phon/PHONEvaluator.php  
File: phon/PHONEvaluator.php
Role: Class source
Content type: text/plain
Description: File for the PHONEvaluator class
Class: PHON
Unserialize values exported with var_export
 

Contents

Class file image Download
<?php
/**
 * File for the PHONEvaluator class.
 * @package PHON
 */

require_once 'PHONValidator.php';

/**
 * Singleton class that safely evaluates PHON data into PHP values.
 * @package PHON
 */
final class PHONEvaluator {
    /**
     * Singleton instance.
     * @var PHONEvaluator
     */
    private static $instance;
    
    /**
     * Singleton access.
     * @return PHONEvaluator Singleton instance.
     */
    public static function getInstance() {
        if (!self::$instance) {
            self::$instance = new PHONEvaluator();
        }
        return self::$instance;
    }
    
    /**
     * A reference to the validator singleton.
     * @var PHONValidator
     */
    private $validator;
    
    /**
     * Constructor.
     */
    private function __construct() {
        $this->validator = PHONValidator::getInstance();
    }
    
    /**
     * Evaluates the provided PHON data.
     * @param string $phon The PHON data.
     * @return mixed The PHP values represented by the PHON data.
     */
    public function evaluate($phon) {
        if (!$this->validator->isSecure($phon)) {
            require_once 'InvalidPHON.php';
            throw new InvalidPHON('PHON data found to be unsecure and evaluation was halted', $phon);
        }
        $data = null;
        if (@eval("\$data = $phon;") === false) {
            require_once 'InvalidPHON.php';
            throw new InvalidPHON('PHON evaluation halted due to invalid data format', $phon);
        }
        return $data;
    }
}

 
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