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

    public function StringExpression()
    {
        if ($this->_lexer->isNextToken(Lexer::T_OPEN_PARENTHESIS)) {
            $peek = $this->_lexer->glimpse();

            if ($peek['type'] === Lexer::T_SELECT) {
                $this->match(Lexer::T_OPEN_PARENTHESIS);
                $expr = $this->Subselect();
                $this->match(Lexer::T_CLOSE_PARENTHESIS);

                return $expr;
            }
        }

        return $this->StringPrimary();
    }

 public function parse(\Doctrine\ORM\Query\Parser $parser)
 {
     $parser->match(Lexer::T_IDENTIFIER);
     $parser->match(Lexer::T_OPEN_PARENTHESIS);
     $lexer = $parser->getLexer();
     if ($lexer->isNextToken(Lexer::T_DISTINCT)) {
         $parser->match(Lexer::T_DISTINCT);
         $this->isDistinct = true;
     }
     // first Path Expression is mandatory
     $this->pathExp = array();
     if ($lexer->isNextToken(Lexer::T_IDENTIFIER)) {
         $this->pathExp[] = $parser->StringExpression();
     } else {
         $this->pathExp[] = $parser->SingleValuedPathExpression();
     }
     while ($lexer->isNextToken(Lexer::T_COMMA)) {
         $parser->match(Lexer::T_COMMA);
         $this->pathExp[] = $parser->StringPrimary();
     }
     if ($lexer->isNextToken(Lexer::T_ORDER)) {
         $this->orderBy = $parser->OrderByClause();
     }
     if ($lexer->isNextToken(Lexer::T_IDENTIFIER)) {
         if (strtolower($lexer->lookahead['value']) !== 'separator') {
             $parser->syntaxError('separator');
         }
         $parser->match(Lexer::T_IDENTIFIER);
         $this->separator = $parser->StringPrimary();
     }
     $parser->match(Lexer::T_CLOSE_PARENTHESIS);
 }