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Converter.php
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Converter.php
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<?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 {
$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;
}
}

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