<?php

/*
 * Chill is a software for social workers
 * 
 * Copyright (C) 2014-2015, Champs Libres Cooperative SCRLFS, 
 * <http://www.champs-libres.coop>, <info@champs-libres.coop>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Chill\MainBundle\Templating;

use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

/**
 * Twig filter to transform a string in a safer way to be the content of a csv
 * cell.
 * 
 * This filter replace the char " by ""
 */
class CSVCellTwig extends AbstractExtension
{
    /*
     * Returns a list of filters to add to the existing list.
     * 
     * (non-PHPdoc)
     * @see Twig_Extension::getFilters()
     */
    public function getFilters()
    {
        return array(
            new TwigFilter(
                'csv_cell',
                array($this, 'csvCellFilter'),
                array('is_safe' => array('html')))
        );
    }
    
    /*
     * Replace into a string the char " by ""
     * 
     * @param String $content The input string.
     * @return String The safe string.
     */
    public function csvCellFilter($content)
    {
        return str_replace('"', '""', $content);
    }
    
    /*
     * Returns the name of the extension.
     *
     * @return The name of the extension.
     */
    public function getName()
    {
        return 'chill_main_csv_cell';
    }
}