Subversion Repositories oidplus

<?php

namespace MatthiasMullie\PathConverter;

/**

 * Convert paths relative from 1 file to another.

 *

 * E.g.

 *     ../../images/icon.jpg relative to /css/imports/icons.css

 * becomes

 *     ../images/icon.jpg relative to /css/minified.css

 *

 * Please report bugs on https://github.com/matthiasmullie/path-converter/issues

 *

 * @author Matthias Mullie <pathconverter@mullie.eu>

 * @copyright Copyright (c) 2015, Matthias Mullie. All rights reserved

 * @license MIT License

 */

class Converter implements ConverterInterface

{

    /**

     * @var string

     */

    protected $from;

    /**

     * @var string

     */

    protected $to;

    /**

     * @param string $from The original base path (directory, not file!)

     * @param string $to   The new base path (directory, not file!)

     * @param string $root Root directory (defaults to `getcwd`)

     */

    public function __construct($from, $to, $root = '')

    {

        $shared = $this->shared($from, $to);

        if ($shared === '') {

            // when both paths have nothing in common, one of them is probably

            // absolute while the other is relative

            $root = $root ?: getcwd();

            $from = strpos($from, $root) === 0 ? $from : preg_replace('/\/+/', '/', $root.'/'.$from);

            $to = strpos($to, $root) === 0 ? $to : preg_replace('/\/+/', '/', $root.'/'.$to);

            // or traveling the tree via `..`

            // attempt to resolve path, or assume it's fine if it doesn't exist

            $from = @realpath($from) ?: $from;

            $to = @realpath($to) ?: $to;

        }

        $from = $this->dirname($from);

        $to = $this->dirname($to);

        $from = $this->normalize($from);

        $to = $this->normalize($to);

        $this->from = $from;

        $this->to = $to;

    }

    /**

     * Normalize path.

     *

     * @param string $path

     *

     * @return string

     */

    protected function normalize($path)

    {

        // deal with different operating systems' directory structure

        $path = rtrim(str_replace(DIRECTORY_SEPARATOR, '/', $path), '/');

        // remove leading current directory.

        if (substr($path, 0, 2) === './') {

            $path = substr($path, 2);

        }

        // remove references to current directory in the path.

        $path = str_replace('/./', '/', $path);

        /*

         * Example:

         *     /home/forkcms/frontend/cache/compiled_templates/../../core/layout/css/../images/img.gif

         * to

         *     /home/forkcms/frontend/core/layout/images/img.gif

         */

        do {

                $count = -1;

            $path = preg_replace('/[^\/]+(?<!\.\.)\/\.\.\//', '', $path, -1, $count);

        } while ($count);

        return $path;

    }

    /**

     * Figure out the shared path of 2 locations.

     *

     * Example:

     *     /home/forkcms/frontend/core/layout/images/img.gif

     * and

     *     /home/forkcms/frontend/cache/minified_css

     * share

     *     /home/forkcms/frontend

     *

     * @param string $path1

     * @param string $path2

     *

     * @return string

     */

    protected function shared($path1, $path2)

    {

        // $path could theoretically be empty (e.g. no path is given), in which

        // case it shouldn't expand to array(''), which would compare to one's

        // root /

        $path1 = $path1 ? explode('/', $path1) : array();

        $path2 = $path2 ? explode('/', $path2) : array();

        $shared = array();

        // compare paths & strip identical ancestors

        foreach ($path1 as $i => $chunk) {

            if (isset($path2[$i]) && $path1[$i] == $path2[$i]) {

                $shared[] = $chunk;

            } else {

                break;

            }

        }

        return implode('/', $shared);

    }

    /**

     * Convert paths relative from 1 file to another.

     *

     * E.g.

     *     ../images/img.gif relative to /home/forkcms/frontend/core/layout/css

     * should become:

     *     ../../core/layout/images/img.gif relative to

     *     /home/forkcms/frontend/cache/minified_css

     *

     * @param string $path The relative path that needs to be converted

     *

     * @return string The new relative path

     */

    public function convert($path)

    {

        // quit early if conversion makes no sense

        if ($this->from === $this->to) {

            return $path;

        }

        $path = $this->normalize($path);

        // if we're not dealing with a relative path, just return absolute

        if (strpos($path, '/') === 0) {

            return $path;

        }

        // normalize paths

        $path = $this->normalize($this->from.'/'.$path);

        // strip shared ancestor paths

        $shared = $this->shared($path, $this->to);

        $path = mb_substr($path, mb_strlen($shared));

        $to = mb_substr($this->to, mb_strlen($shared));

        // add .. for every directory that needs to be traversed to new path

        $to = str_repeat('../', count(array_filter(explode('/', $to))));

        return $to.ltrim($path, '/');

    }

    /**

     * Attempt to get the directory name from a path.

     *

     * @param string $path

     *

     * @return string

     */

    protected function dirname($path)

    {

        if (@is_file($path)) {

            return dirname($path);

        }

        if (@is_dir($path)) {

            return rtrim($path, '/');

        }

        // no known file/dir, start making assumptions

        // ends in / = dir

        if (mb_substr($path, -1) === '/') {

            return rtrim($path, '/');

        }

        // has a dot in the name, likely a file

        if (preg_match('/.*\..*$/', basename($path)) !== 0) {

            return dirname($path);

        }

        // you're on your own here!

        return $path;

    }

}