PcreException.php
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PcreException.php
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	<?php

	/*
	* This file is part of composer/pcre.
	*
	* (c) Composer <https://github.com/composer>
	*
	* For the full copyright and license information, please view
	* the LICENSE file that was distributed with this source code.
	*/

	namespace Composer\Pcre;

	class PcreException extends \RuntimeException
	{
	/**
	* @param string $function
	* @param string\|string[] $pattern
	* @return self
	*/
	public static function fromFunction($function, $pattern)
	{
	$code = preg_last_error();

	if (is_array($pattern)) {
	$pattern = implode(', ', $pattern);
	}

	return new PcreException($function.'(): failed executing "'.$pattern.'": '.self::pcreLastErrorMessage($code), $code);
	}

	/**
	* @param int $code
	* @return string
	*/
	private static function pcreLastErrorMessage($code)
	{
	if (function_exists('preg_last_error_msg')) {
	return preg_last_error_msg();
	}

	$constants = get_defined_constants(true);
	if (!isset($constants['pcre']) \|\| !is_array($constants['pcre'])) {
	return 'UNDEFINED_ERROR';
	}

	foreach ($constants['pcre'] as $const => $val) {
	if ($val === $code && substr($const, -6) === '_ERROR') {
	return $const;
	}
	}

	return 'UNDEFINED_ERROR';
	}
	}