code: public function process_token( $stackPtr ) {
  
  		$file_name      = $this->phpcsFile->getFileName();
  		$file_extension = substr( strrchr( $file_name, '.' ), 1 );
  
  		if ( 'css' === $file_extension ) {
  			if ( \T_STYLE === $this->tokens[ $stackPtr ]['code'] ) {
  				return $this->process_css_style( $stackPtr );
  			}
  		} elseif ( isset( Tokens::$textStringTokens[ $this->tokens[ $stackPtr ]['code'] ] ) ) {
  			/*
  			 * Set $in_style && $in_target_selector to false if it is the first time
  			 * this sniff is run on a file.
  			 */
  			if ( ! isset( $this->in_style[ $file_name ] ) ) {
  				$this->in_style[ $file_name ] = false;
  			}
  			if ( ! isset( $this->in_target_selector[ $file_name ] ) ) {
  				$this->in_target_selector[ $file_name ] = false;
  			}
  
  			return $this->process_text_for_style( $stackPtr, $file_name );
  
  		} else {
  			return parent::process_token( $stackPtr );
  		}
  	}
docs: Processes this test, when one of its tokens is encountered.
  
  @param int $stackPtr The position of the current token in the stack.
  
  @return int|void Integer stack pointer to skip forward or void to continue
  normal file processing.