class ValidClassNameSniff

class ValidClassNameSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_CLASS,
            T_INTERFACE,
            T_TRAIT,
            T_ENUM,
        ];
    }
    
    //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 = $phpcsFile->getTokens();
        if (isset($tokens[$stackPtr]['scope_opener']) === false) {
            $error = 'Possible parse error: %s missing opening or closing brace';
            $data = [
                $tokens[$stackPtr]['content'],
            ];
            $phpcsFile->addWarning($error, $stackPtr, 'MissingBrace', $data);
            return;
        }
        // Determine the name of the class or interface. Note that we cannot
        // simply look for the first T_STRING because a class name
        // starting with the number will be multiple tokens.
        $opener = $tokens[$stackPtr]['scope_opener'];
        $nameStart = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, $opener, true);
        $nameEnd = $phpcsFile->findNext([
            T_WHITESPACE,
            T_COLON,
        ], $nameStart, $opener);
        if ($nameEnd === false) {
            $name = $tokens[$nameStart]['content'];
        }
        else {
            $name = trim($phpcsFile->getTokensAsString($nameStart, $nameEnd - $nameStart));
        }
        // Check for PascalCase format.
        $valid = Common::isCamelCaps($name, true, true, false);
        if ($valid === false) {
            $type = ucfirst($tokens[$stackPtr]['content']);
            $error = '%s name "%s" is not in PascalCase format';
            $data = [
                $type,
                $name,
            ];
            $phpcsFile->addError($error, $stackPtr, 'NotCamelCaps', $data);
            $phpcsFile->recordMetric($stackPtr, 'PascalCase class name', 'no');
        }
        else {
            $phpcsFile->recordMetric($stackPtr, 'PascalCase class name', 'yes');
        }
    }
    
    //end process()

}