<?php

/*

* This file is part of the Symfony package.

*

* (c) Fabien Potencier <[email protected]>

*

* For the full copyright and license information, please view the LICENSE

* file that was distributed with this source code.

*/

namespace Symfony\Component\Form\Util;

/**

* @author Issei Murasawa <[email protected]>

* @author Bernhard Schussek <[email protected]>

*/

class StringUtil

{

/**

* This class should not be instantiated.

*/

private function __construct()

{

}

/**

* Returns the trimmed data.

*/

public static function trim(string $string): string

{

if (null !== $result = @preg_replace('/^[\pZ\p{Cc}\p{Cf}]+|[\pZ\p{Cc}\p{Cf}]+$/u', '', $string)) {

return $result;

}

return trim($string);

}

/**

* Converts both CRLF and CR to LF.

*/

public static function normalizeNewlines(string $string): string

{

return str_replace(["\r\n", "\r"], "\n", $string);

}

/**

* Converts a fully-qualified class name to a block prefix.

*

* @param string $fqcn The fully-qualified class name

*/

public static function fqcnToBlockPrefix(string $fqcn): ?string

{

// Non-greedy ("+?") to match "type" suffix, if present

if (preg_match('~([^\\\\]+?)(type)?$~i', $fqcn, $matches)) {

return strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], ['\\1_\\2', '\\1_\\2'], $matches[1]));

}

return null;

}

}