Doctrine\ORM\Query\Parser::ComparisonOperator PHP Метод

    public function ComparisonOperator()
    {
        switch ($this->_lexer->lookahead['value']) {
            case '=':
                $this->match(Lexer::T_EQUALS);

                return '=';

            case '<':
                $this->match(Lexer::T_LOWER_THAN);
                $operator = '<';

                if ($this->_lexer->isNextToken(Lexer::T_EQUALS)) {
                    $this->match(Lexer::T_EQUALS);
                    $operator .= '=';
                } else if ($this->_lexer->isNextToken(Lexer::T_GREATER_THAN)) {
                    $this->match(Lexer::T_GREATER_THAN);
                    $operator .= '>';
                }

                return $operator;

            case '>':
                $this->match(Lexer::T_GREATER_THAN);
                $operator = '>';

                if ($this->_lexer->isNextToken(Lexer::T_EQUALS)) {
                    $this->match(Lexer::T_EQUALS);
                    $operator .= '=';
                }

                return $operator;

            case '!':
                $this->match(Lexer::T_NEGATE);
                $this->match(Lexer::T_EQUALS);

                return '<>';

            default:
                $this->syntaxError('=, <, <=, <>, >, >=, !=');
        }
    }