class LowercasedFilenameSniff

class LowercasedFilenameSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_TAG,
            T_OPEN_TAG_WITH_ECHO,
        ];
    }
    
    //end register()
    
    /**
     * Processes this sniff, 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 int
     */
    public function process(File $phpcsFile, $stackPtr) {
        $filename = $phpcsFile->getFilename();
        if ($filename === 'STDIN') {
            return $phpcsFile->numTokens;
        }
        $filename = basename($filename);
        $lowercaseFilename = strtolower($filename);
        if ($filename !== $lowercaseFilename) {
            $data = [
                $filename,
                $lowercaseFilename,
            ];
            $error = 'Filename "%s" doesn\'t match the expected filename "%s"';
            $phpcsFile->addError($error, $stackPtr, 'NotFound', $data);
            $phpcsFile->recordMetric($stackPtr, 'Lowercase filename', 'no');
        }
        else {
            $phpcsFile->recordMetric($stackPtr, 'Lowercase filename', 'yes');
        }
        // Ignore the rest of the file.
        return $phpcsFile->numTokens;
    }
    
    //end process()

}