<?php

/**

 * This file is part of Twig.

 *

 * (c) 2009 Fabien Potencier

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 *

 * @author Henrik Bjornskov <hb@peytz.dk>

 * @package Twig

 * @subpackage Twig-extensions

 */

class Twig_Extensions_Extension_Text extends Twig_Extension

{

    /**

     * Returns a list of filters.

     *

     * @return array

     */

    public function getFilters()

    {

        return array(

            'truncate' => new Twig_Filter_Function('twig_truncate_filter', array('needs_environment' => true)),

            'wordwrap' => new Twig_Filter_Function('twig_wordwrap_filter', array('needs_environment' => true)),

            'nl2br'    => new Twig_Filter_Function('twig_nl2br_filter', array('pre_escape' => 'html', 'is_safe' => array('html'))),

        );

    }

    /**

     * Name of this extension

     *

     * @return string

     */

    public function getName()

    {

        return 'Text';

    }

}

function twig_nl2br_filter($value, $sep = '<br />')

{

    return str_replace("\n", $sep."\n", $value);

}

if (function_exists('mb_get_info')) {

    function twig_truncate_filter(Twig_Environment $env, $value, $length = 30, $preserve = false, $separator = '...')

    {

        if (mb_strlen($value, $env->getCharset()) > $length) {

            if ($preserve) {

                if (false !== ($breakpoint = mb_strpos($value, ' ', $length, $env->getCharset()))) {

                    $length = $breakpoint;

                }

            }

            return mb_substr($value, 0, $length, $env->getCharset()) . $separator;

        }

        return $value;

    }

    function twig_wordwrap_filter(Twig_Environment $env, $value, $length = 80, $separator = "\n", $preserve = false)

    {

        $sentences = array();

        $previous = mb_regex_encoding();

        mb_regex_encoding($env->getCharset());

        $pieces = mb_split($separator, $value);

        mb_regex_encoding($previous);

        foreach ($pieces as $piece) {

            while(!$preserve && mb_strlen($piece, $env->getCharset()) > $length) {

                $sentences[] = mb_substr($piece, 0, $length, $env->getCharset());

                $piece = mb_substr($piece, $length, 2048, $env->getCharset());

            }

            $sentences[] = $piece;

        }

        return implode($separator, $sentences);

    }

} else {

  function twig_truncate_filter(Twig_Environment $env, $value, $length = 30, $preserve = false, $separator = '...')

  {

      if (strlen($value) > $length) {

          if ($preserve) {

              if (false !== ($breakpoint = strpos($value, ' ', $length))) {

                  $length = $breakpoint;

              }

          }

          return substr($value, 0, $length) . $separator;

      }

      return $value;

  }

  function twig_wordwrap_filter(Twig_Environment $env, $value, $length = 80, $separator = "\n", $preserve = false)

  {

      return wordwrap($value, $length, $separator, !$preserve);

  }

}