class DuplicateStyleDefinitionSniff

class DuplicateStyleDefinitionSniff implements Sniff {
    
    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = [
        'CSS',
    ];
    
    /**
     * Returns the token types that this sniff is interested in.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_CURLY_BRACKET,
        ];
    }
    
    //end register()
    
    /**
     * Processes the tokens that this sniff is interested in.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file where the token was found.
     * @param int                         $stackPtr  The position in the stack where
     *                                               the token was found.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        if (isset($tokens[$stackPtr]['bracket_closer']) === false) {
            // Syntax error or live coding, bow out.
            return;
        }
        // Find the content of each style definition name.
        $styleNames = [];
        $next = $stackPtr;
        $end = $tokens[$stackPtr]['bracket_closer'];
        do {
            $next = $phpcsFile->findNext([
                T_STYLE,
                T_OPEN_CURLY_BRACKET,
            ], $next + 1, $end);
            if ($next === false) {
                // Class definition is empty.
                break;
            }
            if ($tokens[$next]['code'] === T_OPEN_CURLY_BRACKET) {
                $next = $tokens[$next]['bracket_closer'];
                continue;
            }
            $name = $tokens[$next]['content'];
            if (isset($styleNames[$name]) === true) {
                $first = $styleNames[$name];
                $error = 'Duplicate style definition found; first defined on line %s';
                $data = [
                    $tokens[$first]['line'],
                ];
                $phpcsFile->addError($error, $next, 'Found', $data);
            }
            else {
                $styleNames[$name] = $next;
            }
        } while ($next !== false);
    }
    
    //end process()

}