class ValidGlobalSniff

class ValidGlobalSniff implements Sniff {
    
    /**
     * List of allowed Drupal core global variable names.
     *
     * @var array<string>
     */
    public $coreGlobals = [
        '$argc',
        '$argv',
        '$base_insecure_url',
        '$base_path',
        '$base_root',
        '$base_secure_url',
        '$base_theme_info',
        '$base_url',
        '$channel',
        '$conf',
        '$config',
        '$config_directories',
        '$cookie_domain',
        '$databases',
        '$db_prefix',
        '$db_type',
        '$db_url',
        '$drupal_hash_salt',
        '$drupal_test_info',
        '$element',
        '$forum_topic_list_header',
        '$image',
        '$install_state',
        '$installed_profile',
        '$is_https',
        '$is_https_mock',
        '$item',
        '$items',
        '$language',
        '$language_content',
        '$language_url',
        '$locks',
        '$menu_admin',
        '$multibyte',
        '$pager_limits',
        '$pager_page_array',
        '$pager_total',
        '$pager_total_items',
        '$tag',
        '$theme',
        '$theme_engine',
        '$theme_info',
        '$theme_key',
        '$theme_path',
        '$timers',
        '$update_free_access',
        '$update_rewrite_settings',
        '$user',
    ];
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_GLOBAL,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The current file being processed.
     * @param int                         $stackPtr  The position of the current token
     *                                               in the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $varToken = $stackPtr;
        // Find variable names until we hit a semicolon.
        $ignore = Tokens::$emptyTokens;
        $ignore[] = T_SEMICOLON;
        while (($varToken = $phpcsFile->findNext($ignore, $varToken + 1, null, true, null, true)) !== false) {
            if ($tokens[$varToken]['code'] === T_VARIABLE && in_array($tokens[$varToken]['content'], $this->coreGlobals) === false && $tokens[$varToken]['content'][1] !== '_') {
                $error = 'global variables should start with a single underscore followed by the module and another underscore';
                $phpcsFile->addError($error, $varToken, 'GlobalUnderScore');
            }
        }
    }
    
    //end process()

}