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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Stdlib;
/**
* Wrapper for glob with fallback if GLOB_BRACE is not available.
*/
abstract class Glob
{
/**#@+
* Glob constants.
*/
const GLOB_MARK = 0x01;
const GLOB_NOSORT = 0x02;
const GLOB_NOCHECK = 0x04;
const GLOB_NOESCAPE = 0x08;
const GLOB_BRACE = 0x10;
const GLOB_ONLYDIR = 0x20;
const GLOB_ERR = 0x40;
/**#@-*/
/**
* Find pathnames matching a pattern.
*
* @see http://docs.php.net/glob
* @param string $pattern
* @param int $flags
* @param bool $forceFallback
* @return array
* @throws Exception\RuntimeException
*/
public static function glob($pattern, $flags = 0, $forceFallback = false)
{
if (!defined('GLOB_BRACE') || $forceFallback) {
return static::fallbackGlob($pattern, $flags);
}
return static::systemGlob($pattern, $flags);
}
/**
* Use the glob function provided by the system.
*
* @param string $pattern
* @param int $flags
* @return array
* @throws Exception\RuntimeException
*/
protected static function systemGlob($pattern, $flags)
{
if ($flags) {
$flagMap = array(
self::GLOB_MARK => GLOB_MARK,
self::GLOB_NOSORT => GLOB_NOSORT,
self::GLOB_NOCHECK => GLOB_NOCHECK,
self::GLOB_NOESCAPE => GLOB_NOESCAPE,
self::GLOB_BRACE => GLOB_BRACE,
self::GLOB_ONLYDIR => GLOB_ONLYDIR,
self::GLOB_ERR => GLOB_ERR,
);
$globFlags = 0;
foreach ($flagMap as $internalFlag => $globFlag) {
if ($flags & $internalFlag) {
$globFlags |= $globFlag;
}
}
} else {
$globFlags = 0;
}
ErrorHandler::start();
$res = glob($pattern, $globFlags);
$err = ErrorHandler::stop();
if ($res === false) {
throw new Exception\RuntimeException("glob('{$pattern}', {$globFlags}) failed", 0, $err);
}
return $res;
}
/**
* Expand braces manually, then use the system glob.
*
* @param string $pattern
* @param int $flags
* @return array
* @throws Exception\RuntimeException
*/
protected static function fallbackGlob($pattern, $flags)
{
if (!$flags & self::GLOB_BRACE) {
return static::systemGlob($pattern, $flags);
}
$flags &= ~self::GLOB_BRACE;
$length = strlen($pattern);
$paths = array();
if ($flags & self::GLOB_NOESCAPE) {
$begin = strpos($pattern, '{');
} else {
$begin = 0;
while (true) {
if ($begin === $length) {
$begin = false;
break;
} elseif ($pattern[$begin] === '\\' && ($begin + 1) < $length) {
$begin++;
} elseif ($pattern[$begin] === '{') {
break;
}
$begin++;
}
}
if ($begin === false) {
return static::systemGlob($pattern, $flags);
}
$next = static::nextBraceSub($pattern, $begin + 1, $flags);
if ($next === null) {
return static::systemGlob($pattern, $flags);
}
$rest = $next;
while ($pattern[$rest] !== '}') {
$rest = static::nextBraceSub($pattern, $rest + 1, $flags);
if ($rest === null) {
return static::systemGlob($pattern, $flags);
}
}
$p = $begin + 1;
while (true) {
$subPattern = substr($pattern, 0, $begin)
. substr($pattern, $p, $next - $p)
. substr($pattern, $rest + 1);
$result = static::fallbackGlob($subPattern, $flags | self::GLOB_BRACE);
if ($result) {
$paths = array_merge($paths, $result);
}
if ($pattern[$next] === '}') {
break;
}
$p = $next + 1;
$next = static::nextBraceSub($pattern, $p, $flags);
}
return array_unique($paths);
}
/**
* Find the end of the sub-pattern in a brace expression.
*
* @param string $pattern
* @param int $begin
* @param int $flags
* @return int|null
*/
protected static function nextBraceSub($pattern, $begin, $flags)
{
$length = strlen($pattern);
$depth = 0;
$current = $begin;
while ($current < $length) {
if (!$flags & self::GLOB_NOESCAPE && $pattern[$current] === '\\') {
if (++$current === $length) {
break;
}
$current++;
} else {
if (($pattern[$current] === '}' && $depth-- === 0) || ($pattern[$current] === ',' && $depth === 0)) {
break;
} elseif ($pattern[$current++] === '{') {
$depth++;
}
}
}
return ($current < $length ? $current : null);
}
}
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