<?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 TablePress\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';
	}
}
