<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\View\Helper;

/**
* Path pattern creation helper
*/
class PathPattern
{
/**
* Translate pattern with glob syntax into regular expression
*
* @param string $path
* @return string
*/
public function translatePatternFromGlob($path)
{
$pattern = str_replace(['\\?', '\\*'], ['[^/]', '[^/]*'], preg_quote($path));
$pattern = $this->translateGroupsFromGlob($pattern);
$pattern = $this->translateCharacterGroupsFromGlob($pattern);
return $pattern;
}

/**
* Translate groups from escaped glob syntax into regular expression
*
* Example: filename\.\{php,css,js\} -> filename\.(?:php|css|js)
* Transformations:
* 1. \{ -> (?:
* 2. , -> |
* 3. \} -> )
*
* @param string $pattern
* @return string
*/
protected function translateGroupsFromGlob($pattern)
{
preg_match_all('~\\\\\\{[^,\\}]+(?:,[^,\\}]*)*\\\\\\}~', $pattern, $matches, PREG_OFFSET_CAPTURE);
for ($index = count($matches[0]) - 1; $index >= 0; $index--) {
list($match, $offset) = $matches[0][$index];
$replacement = substr_replace($match, '(?:', 0, 2);
$replacement = substr_replace($replacement, ')', -2);
$replacement = str_replace(',', '|', $replacement);
$pattern = substr_replace($pattern, $replacement, $offset, strlen($match));
}
return $pattern;
}

/**
* Translate character groups from escaped glob syntax into regular expression
*
* Example: \[\!a\-f\]\.php -> [^a-f]\.php
* Transformations:
* 1. \[ -> [
* 2. \! -> ^
* 3. \- -> -
* 4. \] -> ]
*
* @param string $pattern
* @return string
*/
protected function translateCharacterGroupsFromGlob($pattern)
{
preg_match_all('~\\\\\\[(\\\\\\!)?[^\\]]+\\\\\\]~i', $pattern, $matches, PREG_OFFSET_CAPTURE);
for ($index = count($matches[0]) - 1; $index >= 0; $index--) {
list($match, $offset) = $matches[0][$index];
$exclude = !(empty($matches[1][$index]) || empty($matches[1][$index][0]));
$replacement = substr_replace($match, '[' . ($exclude ? '^' : ''), 0, $exclude ? 4 : 2);
$replacement = substr_replace($replacement, ']', -2);
$replacement = str_replace('\\-', '-', $replacement);
$pattern = substr_replace($pattern, $replacement, $offset, strlen($match));
}
return $pattern;
}
}