private function _checkWhiteSpaceBefore($text) {
		if ($this->_isActive('checkWhiteSpaceBefore')) {

			if (!$this->_config->isException('checkWhiteSpaceBefore', $text)) {

				if (!$this->tokenizer->checkPreviousToken(T_WHITESPACE)) {
					$msg = $this->_getMessage('SPACE_BEFORE_TOKEN', $text);
					$this->_writeError('checkWhiteSpaceBefore', $msg);
				}
			}
		}
	}