/// <summary>
/// Resolves types for the specified expression.
/// </summary>
/// <param name="expression">The expression to resolve types for.</param>
/// <returns>Expression with resolved types.</returns>
public QueryExpression Visit(QueryFunctionParameterReferenceExpression expression)
{
Function function = this.CustomFunctionsCallStack.Peek();
FunctionParameter parameter = function.Parameters.SingleOrDefault(p => p.Name == expression.ParameterName);
ExceptionUtilities.CheckObjectNotNull(parameter, "Parameter '{0}' does not exist in Function '{1}'.", expression.ParameterName, function.Name);
QueryType queryType = this.GetDefaultQueryType(parameter.DataType);
return(new QueryFunctionParameterReferenceExpression(expression.ParameterName, queryType));
}
/// <summary>
/// Replaces function parameter reference expression with an expression represeting argument for the parameter
/// </summary>
/// <param name="expression">The function parameter reference expression</param>
/// <returns>An expression represeting corresponding argument for the parameter</returns>
protected QueryExpression ReplaceFunctionParameterReference(QueryFunctionParameterReferenceExpression expression)
{
string parameterName = expression.ParameterName;
var functionCall = this.customFunctionsCallStack.Peek();
var parameters = functionCall.Function.Parameters;
var arguemnts = functionCall.Arguments;
var matchingParameters = parameters.Where(p => p.Name == parameterName).ToList();
ExceptionUtilities.Assert(
matchingParameters.Count == 1,
"Found {0} parameters with name '{1}'. Expected: 1. Function: '{2}'.",
matchingParameters.Count,
parameterName,
functionCall.Function.FullName);
int index = parameters.IndexOf(matchingParameters[0]);
return(arguemnts[index]);
}
/// <summary>
/// Replaces the given expression.
/// </summary>
/// <param name="expression">Expression to replace.</param>
/// <returns>Replaced expression.</returns>
public virtual QueryExpression Visit(QueryFunctionParameterReferenceExpression expression)
{
return(expression);
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the QueryFunctionParameterReferenceExpression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Uri query string representing the expression.</returns>
public virtual string Visit(QueryFunctionParameterReferenceExpression expression)
{
throw new TaupoNotSupportedException("Not supported");
}
/// <summary>
/// Generates System.CodeDom.CodeExpression from the given expression.
/// </summary>
/// <param name="expression">Expression from which System.CodeDom.CodeExpression is generated.</param>
/// <returns>Generated System.CodeDom.CodeExpression.</returns>
public virtual CodeExpression Visit(QueryFunctionParameterReferenceExpression expression)
{
return(Code.Variable(expression.ParameterName));
}
/// <summary>
/// Replaces parameter reference with a corresponding argument of a function call
/// </summary>
/// <param name="expression">The expression to replace</param>
/// <returns>The expression which represents corresponding argument for the parameter reference</returns>
public override QueryExpression Visit(QueryFunctionParameterReferenceExpression expression)
{
return(this.ReplaceFunctionParameterReference(expression));
}
/// <summary>
/// Replaces parameter reference with a corresponding argument of a function call
/// </summary>
/// <param name="expression">The expression to replace</param>
/// <returns>The expression which represents corresponding argument for the parameter reference</returns>
public override QueryExpression Visit(QueryFunctionParameterReferenceExpression expression)
{
return this.ReplaceFunctionParameterReference(expression);
}
/// <summary>
/// Evaluates the specified expression.
/// </summary>
/// <param name="expression">The expression to evaluate.</param>
/// <returns>Value of the expression.</returns>
public QueryValue Visit(QueryFunctionParameterReferenceExpression expression)
{
throw new TaupoInvalidOperationException("Should never evaluate function parameter reference");
}
