<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_View

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Stream.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * Stream wrapper to convert markup of mostly-PHP templates into PHP prior to

 * include().

 *

 * Based in large part on the example at

 * http://www.php.net/manual/en/function.stream-wrapper-register.php

 *

 * As well as the example provided at:

 *     http://mikenaberezny.com/2006/02/19/symphony-templates-ruby-erb/

 * written by

 *     Mike Naberezny (@link http://mikenaberezny.com)

 *     Paul M. Jones  (@link http://paul-m-jones.com)

 *

 * @category   Zend

 * @package    Zend_View

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_View_Stream

{

    /**

     * Current stream position.

     *

     * @var int

     */

    protected $_pos = 0;

    /**

     * Data for streaming.

     *

     * @var string

     */

    protected $_data;

    /**

     * Stream stats.

     *

     * @var array

     */

    protected $_stat;

    /**

     * Opens the script file and converts markup.

     */

    public function stream_open($path, $mode, $options, &$opened_path)

    {

        // get the view script source

        $path        = str_replace('zend.view://', '', $path);

        $this->_data = file_get_contents($path);

        /**

         * If reading the file failed, update our local stat store

         * to reflect the real stat of the file, then return on failure

         */

        if ($this->_data === false) {

            $this->_stat = stat($path);

            return false;

        }

        /**

         * Convert <?= ?> to long-form <?php echo ?> and <? ?> to <?php ?>

         *

         */

        $this->_data = preg_replace('/\<\?\=/',          "<?php echo ",  $this->_data);

        $this->_data = preg_replace('/<\?(?!xml|php)/s', '<?php ',       $this->_data);

        /**

         * file_get_contents() won't update PHP's stat cache, so we grab a stat

         * of the file to prevent additional reads should the script be

         * requested again, which will make include() happy.

         */

        $this->_stat = stat($path);

        return true;

    }

    /**

     * Included so that __FILE__ returns the appropriate info

     *

     * @return array

     */

    public function url_stat()

    {

        return $this->_stat;

    }

    /**

     * Reads from the stream.

     */

    public function stream_read($count)

    {

        $ret = substr($this->_data, $this->_pos, $count);

        $this->_pos += strlen($ret);

        return $ret;

    }

    /**

     * Tells the current position in the stream.

     */

    public function stream_tell()

    {

        return $this->_pos;

    }

    /**

     * Tells if we are at the end of the stream.

     */

    public function stream_eof()

    {

        return $this->_pos >= strlen($this->_data);

    }

    /**

     * Stream statistics.

     */

    public function stream_stat()

    {

        return $this->_stat;

    }

    /**

     * Seek to a specific point in the stream.

     */

    public function stream_seek($offset, $whence)

    {

        switch ($whence) {

            case SEEK_SET:

                if ($offset < strlen($this->_data) && $offset >= 0) {

                $this->_pos = $offset;

                    return true;

                } else {

                    return false;

                }

                break;

            case SEEK_CUR:

                if ($offset >= 0) {

                    $this->_pos += $offset;

                    return true;

                } else {

                    return false;

                }

                break;

            case SEEK_END:

                if (strlen($this->_data) + $offset >= 0) {

                    $this->_pos = strlen($this->_data) + $offset;

                    return true;

                } else {

                    return false;

                }

                break;

            default:

                return false;

        }

    }

}