StrictTypesSniff.php

<?php
/**
 * Copyright © ExtDN. All rights reserved.
 */

declare(strict_types=1);

namespace Extdn\Sniffs\Classes;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;

/**
 * Class StrictTypesSniff
 * @package Extdn\Sniffs\Classes
 */
class StrictTypesSniff implements Sniff
{
    /**
     * @var array
     */
    public $supportedTokenizers = ['PHP'];

    /**
     * @var string
     */
    protected $message = 'Define declare(strict_types=1).';

    /**
     * @return array|int[]
     */
    public function register()
    {
        return [T_CLASS];
    }

    /**
     * @param File $phpcsFile
     * @param int $stackPtr
     * @return int|void
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();
        $hasDeclareStrictTypes = false;

        $declarePosition = $phpcsFile->findNext([T_DECLARE], 0);
        if ($declarePosition !== false) {
            $lineEnd = $phpcsFile->findNext([T_SEMICOLON], $declarePosition);

            // extract all tokens between declare and line end
            $tokens = \array_slice($tokens, $declarePosition, $lineEnd - 1);
            $hasDeclareStrictTypes = $this->hasDeclareStrictTypes($tokens);
        }

        if ($hasDeclareStrictTypes === false) {
            $error = $this->message . ' Not Found';
            $phpcsFile->addWarning($error, null, 'NotFound');
        }
    }

    /**
     * Checks has the File with strict_types=1
     *
     * @param array $tokens
     * @param $start
     * @return bool
     */
    private function hasDeclareStrictTypes(array $tokens): bool
    {
        $containsStrictType = false;
        $isEnabled = false;

        foreach ($tokens as $token) {
            if ($token['code'] === T_STRING && $token['content'] === 'strict_types') {
                $containsStrictType = true;
            }

            if ($token['code'] === T_LNUMBER && $token['content'] === '1') {
                $isEnabled = true;
            }
        }

        return $containsStrictType && $isEnabled;
    }
}