<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Custom predicate built by supplying a string expression
 *
 * PHP versions 4 and 5
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330,Boston,MA 02111-1307 USA
 *
 * @category   File Formats
 * @package    File_Archive
 * @author     Vincent Lascaux <vincentlascaux@php.net>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL
 * @version    CVS: $Id$
 * @link       http://pear.php.net/package/File_Archive
 */

require_once "File/Archive/Predicate.php";

/**
 * Custom predicate built by supplying a string expression
 *
 * Example:
 *     new File_Archive_Predicate_Custom("return strlen($name)<100;")
 *     new File_Archive_Predicate_Custom("strlen($name)<100;")
 *     new File_Archive_Predicate_Custom("strlen($name)<100")
 *     new File_Archive_Predicate_Custom("strlen($source->getFilename())<100")
 *
 * @see        File_Archive_Predicate, File_Archive_Reader_Filter
 */
class File_Archive_Predicate_Custom extends File_Archive_Predicate
{
    var $expression;
    var $useName;
    var $useStat;
    var $useMIME;

    /**
     * @param string $expression PHP code that evaluates too a boolean
     *        It can use the $source variable. If return is ommited, it will be
     *        added to the begining of the expression. A ; will also be added at
     *        the end so that you don't need to write it
     */
    function File_Archive_Predicate_Custom($expression)
    {
        $this->expression = $expression.";";
        if (strpos($this->expression, "return") === false) {
            $this->expression = "return ".$this->expression;
        }
        $this->useName = (strpos($this->expression, '$name') !== false);
        $this->useStat = (strpos($this->expression, '$stat') !== false);
        $this->useMIME = (strpos($this->expression, '$mime') !== false);
    }
    /**
     * @see File_Archive_Predicate::isTrue()
     */
    function isTrue(&$source)
    {
        if ($this->useName) {
            $name = $source->getFilename();
        }
        if ($this->useStat) {
            $stat = $source->getStat();
            $size = $stat[7];
            $time = (isset($stat[9]) ? $stat[9] : null);
        }
        if ($this->useMIME) {
            $mime = $source->getMIME();
        }
        return (bool)eval($this->expression);
    }
}

?>
