<?php
/* 
 * @package     ContentCMS
 * @author      Dan Goldsmith
 * @copyright   Dan Goldsmith 2012
 * @link        http://contentcms.d2g.org.uk/
 * @version     {SUBVERSION_BUILD_NUMBER}
 * 
 * @licence     MPL 2.0
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. 
 */
if(!function_exists('realPathFromRelative')) 
{
    function realPathFromRelative($path) 
    { 
        $path = preg_replace("#/+\.?/+#", "/", str_replace("\\", "/", $path)); 
        $dirs = explode("/", rtrim(preg_replace('#^(\./)+#', '', $path), '/')); 

        $offset = 0; 
        $sub = 0; 
        $subOffset = 0; 
        $root = ""; 

        if (empty($dirs[0])) 
        { 
            $root = "/"; 
            $dirs = array_splice($dirs, 1); 
        } 
        else if (preg_match("#[A-Za-z]:#", $dirs[0])) 
        { 
            $root = strtoupper($dirs[0]) . "/"; 
            $dirs = array_splice($dirs, 1); 
        }  

        $newDirs = array(); 
        foreach($dirs as $dir) 
        { 
            if ($dir !== "..") 
            { 
                $subOffset--;     
                $newDirs[++$offset] = $dir; 
            } 
            else 
            { 
                $subOffset++; 
                if (--$offset < 0) 
                { 
                    $offset = 0; 
                    if ($subOffset > $sub) 
                    { 
                        $sub++; 
                    }  
                } 
            } 
        } 

        if (empty($root)) 
        { 
            $root = str_repeat("../", $sub); 
        }

        $root = $root . implode("/", array_slice($newDirs, 0, $offset));
        return $root; 
    } 
}
?>