Method ParseExpression

Source/SpireCore/Parser.cpp:1731–1786

		}

		RefPtr<ExpressionSyntaxNode> Parser::ParseExpression(int level)
		{
			if (level == MaxExprLevel)
				return ParseLeafExpression();
			if (level == 1)
			{
				// parse select clause
				auto condition = ParseExpression(level + 1);
				if (LookAheadToken(TokenType::QuestionMark))
				{
					RefPtr<SelectExpressionSyntaxNode> select = new SelectExpressionSyntaxNode();
					FillPosition(select.Ptr());
					ReadToken(TokenType::QuestionMark);
					select->SelectorExpr = condition;
					select->Expr0 = ParseExpression(level);
					ReadToken(TokenType::Colon);
					select->Expr1 = ParseExpression(level);
					return select;
				}
				else
					return condition;
			}
			else
			{
				if (GetAssociativityFromLevel(level) == Associativity::Left)
				{
					auto left = ParseExpression(level + 1);
					while (GetOpLevel(tokenReader.PeekTokenType()) == level)
					{
						RefPtr<BinaryExpressionSyntaxNode> tmp = new BinaryExpressionSyntaxNode();
						tmp->LeftExpression = left;
						FillPosition(tmp.Ptr());
						Token opToken = tokenReader.AdvanceToken();
						tmp->Operator = GetOpFromToken(opToken);
						tmp->RightExpression = ParseExpression(level + 1);
						left = tmp;
					}
					return left;
				}
				else
				{
					auto left = ParseExpression(level + 1);
					if (GetOpLevel(tokenReader.PeekTokenType()) == level)
					{
						RefPtr<BinaryExpressionSyntaxNode> tmp = new BinaryExpressionSyntaxNode();
						tmp->LeftExpression = left;
						FillPosition(tmp.Ptr());
						Token opToken = tokenReader.AdvanceToken();
						tmp->Operator = GetOpFromToken(opToken);
						tmp->RightExpression = ParseExpression(level);
						left = tmp;
					}
					return left;
				}
			}
		}

		RefPtr<ExpressionSyntaxNode> Parser::ParseLeafExpression()