class LowercaseDeclarationSniff

class LowercaseDeclarationSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_IF,
            T_ELSE,
            T_ELSEIF,
            T_FOREACH,
            T_FOR,
            T_DO,
            T_SWITCH,
            T_WHILE,
            T_TRY,
            T_CATCH,
            T_MATCH,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @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) {
        $tokens = $phpcsFile->getTokens();
        $content = $tokens[$stackPtr]['content'];
        $contentLc = strtolower($content);
        if ($content !== $contentLc) {
            $error = '%s keyword must be lowercase; expected "%s" but found "%s"';
            $data = [
                strtoupper($content),
                $contentLc,
                $content,
            ];
            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'FoundUppercase', $data);
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($stackPtr, $contentLc);
            }
        }
    }
    
    //end process()

}