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<?php
declare(strict_types=1);
namespace Dotenv\Util;
use GrahamCampbell\ResultType\Error;
use GrahamCampbell\ResultType\Success;
use PhpOption\Option;
/**
* @internal
*/
final class Str
{
/**
* This class is a singleton.
*
* @codeCoverageIgnore
*
* @return void
*/
private function __construct()
{
//
}
/**
* Convert a string to UTF-8 from the given encoding.
*
* @param string $input
* @param string|null $encoding
*
* @return \GrahamCampbell\ResultType\Result<string,string>
*/
public static function utf8(string $input, string $encoding = null)
{
if ($encoding !== null && !\in_array($encoding, \mb_list_encodings(), true)) {
/** @var \GrahamCampbell\ResultType\Result<string,string> */
return Error::create(
\sprintf('Illegal character encoding [%s] specified.', $encoding)
);
}
/** @var \GrahamCampbell\ResultType\Result<string,string> */
return Success::create(
$encoding === null ? @\mb_convert_encoding($input, 'UTF-8') : @\mb_convert_encoding($input, 'UTF-8', $encoding)
);
}
/**
* Search for a given substring of the input.
*
* @param string $haystack
* @param string $needle
*
* @return \PhpOption\Option<int>
*/
public static function pos(string $haystack, string $needle)
{
/** @var \PhpOption\Option<int> */
return Option::fromValue(\mb_strpos($haystack, $needle, 0, 'UTF-8'), false);
}
/**
* Grab the specified substring of the input.
*
* @param string $input
* @param int $start
* @param int|null $length
*
* @return string
*/
public static function substr(string $input, int $start, int $length = null)
{
return \mb_substr($input, $start, $length, 'UTF-8');
}
/**
* Compute the length of the given string.
*
* @param string $input
*
* @return int
*/
public static function len(string $input)
{
return \mb_strlen($input, 'UTF-8');
}
}