protected virtual RqlExpression Visit(RqlExpression node)
{
if (node == null)
{
return(node);
}
switch (node.ExpressionType)
{
case RqlExpressionType.Constant:
return(this.VisitConstant((RqlConstantExpression)node));
case RqlExpressionType.Identifier:
return(this.VisitIdentifier((RqlIdentifierExpression)node));
case RqlExpressionType.FunctionCall:
return(this.VisitFunctionCall((RqlFunctionCallExpression)node));
case RqlExpressionType.Tuple:
return(this.VisitTuple((RqlTupleExpression)node));
default:
throw new NotImplementedException();
}
}
private RqlTupleExpression ParseTuple(RqlToken leftParenToken)
{
var constants = new List <RqlConstantExpression>();
Type itemType = null;
while (true)
{
RqlToken token = tokenizer.Next();
if (token.IsConstant)
{
if (itemType == null)
{
itemType = token.Data.GetType();
}
else if (token.Data.GetType() != itemType)
{
throw new RqlParseException(token, "Tuple items must all be of the same type");
}
constants.Add(RqlExpression.Constant(token));
}
else
{
throw new RqlParseException(token);
}
token = tokenizer.Next();
if (token.IsComma)
{
continue;
}
else if (token.IsRightParen)
{
break;
}
else
{
throw new RqlParseException(token);
}
}
return(RqlExpression.Tuple(leftParenToken, constants));
}
protected virtual RqlExpression Visit(RqlExpression node)
{
if (node == null)
return node;
switch (node.ExpressionType)
{
case RqlExpressionType.Constant:
return this.VisitConstant((RqlConstantExpression)node);
case RqlExpressionType.Identifier:
return this.VisitIdentifier((RqlIdentifierExpression)node);
case RqlExpressionType.FunctionCall:
return this.VisitFunctionCall((RqlFunctionCallExpression)node);
case RqlExpressionType.Tuple:
return this.VisitTuple((RqlTupleExpression)node);
default:
throw new NotImplementedException();
}
}
private RqlExpression ParseExpression(RqlToken functionToken)
{
RqlToken token = tokenizer.Next();
if (!token.IsLeftParen)
{
throw new RqlParseException(token);
}
var arguments = new List <RqlExpression>();
while (true)
{
token = tokenizer.Next();
RqlExpression argument = null;
if (token.IsIdentifier)
{
if (tokenizer.PeekNext().IsLeftParen)
{
argument = ParseExpression(token);
}
else
{
argument = RqlExpression.Identifier(token);
}
}
else if (token.IsConstant)
{
argument = RqlExpression.Constant(token);
}
else if (token.IsLeftParen)
{
argument = ParseTuple(token);
}
else
{
throw new RqlParseException(token);
}
arguments.Add(argument);
token = tokenizer.Next();
if (token.IsComma)
{
continue;
}
else if (token.IsRightParen)
{
break;
}
else
{
throw new RqlParseException(token);
}
}
return(RqlExpression.FunctionCall(functionToken, arguments));
}
public TestExpressionVisitor(RqlExpression exp)
{
this.exp = exp;
}