<?php
/**
 * PHPCompatibility, an external standard for PHP_CodeSniffer.
 *
 * @package   PHPCompatibility
 * @copyright 2012-2020 PHPCompatibility Contributors
 * @license   https://opensource.org/licenses/LGPL-3.0 LGPL3
 * @link      https://github.com/PHPCompatibility/PHPCompatibility
 */

namespace PHPCompatibility\Sniffs\FunctionDeclarations;

use PHP_CodeSniffer\Files\File;
use PHPCompatibility\Sniff;

/**
 * The arrow function syntax for short functions is available since PHP 7.4.
 *
 * PHP version 7.4
 *
 * @link https://www.php.net/manual/en/migration74.new-features.php#migration74.new-features.core.arrow-functions
 * @link https://wiki.php.net/rfc/arrow_functions_v2
 *
 * @since 10.0.0
 */
class NewArrowFunctionSniff extends Sniff
{

    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @since 10.0.0
     *
     * @return array
     */
    public function register()
    {
        return [\T_FN];
    }

    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @since 10.0.0
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in the
     *                                               stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        if ($this->supportsBelow('7.3') === false) {
            return;
        }

        $phpcsFile->addError(
            'Arrow functions are not available in PHP 7.3 or earlier.',
            $stackPtr,
            'Found'
        );
    }
}
