File: phon/PHONEvaluator.php - PHON

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:

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<?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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