<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */
 
namespace Zend\Validator\Barcode;
 
class Codabar extends AbstractAdapter
{
    /**
     * Constructor for this barcode adapter
     */
    public function __construct()
    {
        $this->setLength(-1);
        $this->setCharacters('0123456789-$:/.+ABCDTN*E');
        $this->useChecksum(false);
    }
 
    /**
     * Checks for allowed characters
     * @see Zend\Validator\Barcode.AbstractAdapter::checkChars()
     */
    public function hasValidCharacters($value)
    {
        if (strpbrk($value, 'ABCD')) {
            $first = $value[0];
            if (!strpbrk($first, 'ABCD')) {
                // Missing start char
                return false;
            }
 
            $last = substr($value, -1, 1);
            if (!strpbrk($last, 'ABCD')) {
                // Missing stop char
                return false;
            }
 
            $value = substr($value, 1, -1);
        } elseif (strpbrk($value, 'TN*E')) {
            $first = $value[0];
            if (!strpbrk($first, 'TN*E')) {
                // Missing start char
                return false;
            }
 
            $last = substr($value, -1, 1);
            if (!strpbrk($last, 'TN*E')) {
                // Missing stop char
                return false;
            }
 
            $value = substr($value, 1, -1);
        }
 
        $chars  = $this->getCharacters();
        $this->setCharacters('0123456789-$:/.+');
        $result = parent::hasValidCharacters($value);
        $this->setCharacters($chars);
        return $result;
    }
}