<?php
/**
 * PHPCompatibility, an external standard for PHP_CodeSniffer.
 *
 * @package   PHPCompatibility
 * @copyright 2012-2019 PHPCompatibility Contributors
 * @license   https://opensource.org/licenses/LGPL-3.0 LGPL3
 * @link      https://github.com/PHPCompatibility/PHPCompatibility
 */

namespace PHPCompatibility\Sniffs\ParameterValues;

use PHPCompatibility\AbstractFunctionCallParameterSniff;
use PHP_CodeSniffer_File as File;

/**
 * Detect: Passing `null` to `get_class()` is no longer allowed as of PHP 7.2.
 * This will now result in an `E_WARNING` being thrown.
 *
 * PHP version 7.2
 *
 * @link https://wiki.php.net/rfc/get_class_disallow_null_parameter
 * @link https://www.php.net/manual/en/function.get-class.php#refsect1-function.get-class-changelog
 *
 * @since 9.0.0
 */
class ForbiddenGetClassNullSniff extends AbstractFunctionCallParameterSniff {


	/**
	 * Functions to check for.
	 *
	 * @since 9.0.0
	 *
	 * @var array
	 */
	protected $targetFunctions = array(
		'get_class' => true,
	);


	/**
	 * Do a version check to determine if this sniff needs to run at all.
	 *
	 * @since 9.0.0
	 *
	 * @return bool
	 */
	protected function bowOutEarly() {
		return ( $this->supportsAbove( '7.2' ) === false );
	}


	/**
	 * Process the parameters of a matched function.
	 *
	 * @since 9.0.0
	 *
	 * @param \PHP_CodeSniffer_File $phpcsFile    The file being scanned.
	 * @param int                   $stackPtr     The position of the current token in the stack.
	 * @param string                $functionName The token content (function name) which was matched.
	 * @param array                 $parameters   Array with information about the parameters.
	 *
	 * @return int|void Integer stack pointer to skip forward or void to continue
	 *                  normal file processing.
	 */
	public function processParameters( File $phpcsFile, $stackPtr, $functionName, $parameters ) {
		if ( isset( $parameters[1] ) === false ) {
			return;
		}

		if ( $parameters[1]['raw'] !== 'null' ) {
			return;
		}

		$phpcsFile->addError(
			'Passing "null" as the $object to get_class() is not allowed since PHP 7.2.',
			$parameters[1]['start'],
			'Found'
		);
	}
}
