/// <summary>
/// Evaluates the specified expression.
/// </summary>
/// <param name="expression">The expression to evaluate.</param>
/// <returns>Value of the expression.</returns>
public QueryValue Visit(LinqFreeVariableExpression expression)
{
QueryExpression freeVariable;
if (!this.freeVariableAssignments.TryGetValue(expression.Name, out freeVariable))
{
freeVariable = expression.Values.First();
}
return(this.Evaluate(freeVariable));
}
/// <summary>
/// Replaces the given expression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Replaced expression.</returns>
public virtual QueryExpression Visit(LinqFreeVariableExpression expression)
{
QueryExpression[] values = expression.Values.Select(this.ReplaceExpression).ToArray();
if (HasChanged(expression.Values, values))
{
return(new LinqFreeVariableExpression(expression.Name, expression.ExpressionType, values));
}
return(expression);
}
/// <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(LinqFreeVariableExpression expression)
{
CodeFreeVariable codeFreeVariable;
if (!this.freeVariables.TryGetValue(expression, out codeFreeVariable))
{
IEnumerable <CodeExpression> values = expression.Values.Select(v => this.GenerateCode(v));
CodeTypeReference typeReference = this.GetTypeReference(expression.ExpressionType);
codeFreeVariable = new CodeFreeVariable(expression.Name, typeReference, values);
this.freeVariables.Add(expression, codeFreeVariable);
}
return(Code.Variable(codeFreeVariable.Name));
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqFreeVariableExpression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Uri query string representing the expression.</returns>
public override string Visit(LinqFreeVariableExpression expression)
{
return expression.Values.Single().Accept(this);
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqFreeVariableExpression.
/// </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(LinqFreeVariableExpression expression)
{
throw new TaupoNotSupportedException("Not supported");
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqFreeVariableExpression. Free variable information is extracted.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Replaced expression.</returns>
public override QueryExpression Visit(LinqFreeVariableExpression expression)
{
this.freeVariableAssignments.Add(expression.Name, expression.Values);
return base.Visit(expression);
}
/// <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(LinqFreeVariableExpression expression)
{
return(expression);
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqFreeVariableExpression. Free variable information is extracted.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Replaced expression.</returns>
public override QueryExpression Visit(LinqFreeVariableExpression expression)
{
this.freeVariableAssignments.Add(expression.Name, expression.Values);
return(base.Visit(expression));
}
/// <summary>
/// Visits a QueryExpression tree whose root node is the LinqFreeVariableExpression.
/// </summary>
/// <param name="expression">The root node of the expression tree being visited.</param>
/// <returns>Uri query string representing the expression.</returns>
public override string Visit(LinqFreeVariableExpression expression)
{
return(expression.Values.Single().Accept(this));
}
