class UpperCaseConstantSniff

class UpperCaseConstantSniff extends LowerCaseConstantSniff {
    
    /**
     * Processes a non-type declaration constant.
     *
     * @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
     */
    protected function processConstant(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $keyword = $tokens[$stackPtr]['content'];
        $expected = strtoupper($keyword);
        if ($keyword !== $expected) {
            if ($keyword === strtolower($keyword)) {
                $phpcsFile->recordMetric($stackPtr, 'PHP constant case', 'lower');
            }
            else {
                $phpcsFile->recordMetric($stackPtr, 'PHP constant case', 'mixed');
            }
            $error = 'TRUE, FALSE and NULL must be uppercase; expected "%s" but found "%s"';
            $data = [
                $expected,
                $keyword,
            ];
            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Found', $data);
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($stackPtr, $expected);
            }
        }
        else {
            $phpcsFile->recordMetric($stackPtr, 'PHP constant case', 'upper');
        }
    }
    
    //end processConstant()

}