/// <summary>
/// An invokation. Attempt to decode the Compile from an Expression. Support the normal ".NET" way of doing things
/// as opposed to the "invoke" method above (which has a slightly cleaner syntax, but not much!).
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Expression Transform(InvocationExpression expression)
{
//
// Fail quickly looking for the call
//
if (expression.Expression.NodeType != ExpressionType.Call)
{
return(expression);
}
var callExpr = expression.Expression as MethodCallExpression;
if (callExpr.Object == null)
{
return(expression);
}
if (!typeof(Expression).IsAssignableFrom(callExpr.Object.Type))
{
return(expression);
}
if (callExpr.Method.Name != "Compile")
{
return(expression);
}
//
// Now, pick a part the expression type and make sure it is a func!
//
var exprFinder = new ExpressionFunctionExpander();
return(exprFinder.Visit(expression));
}
/// <summary>
/// If this is one of our Invoke method calls, then we can try to do expression replacement.
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Expression Transform(MethodCallExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
//
// Fail quickly if this isn't something we are interested in.
//
if (expression.Object != null ||
expression.Method.Name != "Invoke")
{
return(expression);
}
if (expression.Method.DeclaringType != typeof(Helpers))
{
return(expression);
}
//
// Ok, this is real. Get the expression. The compiler should make sure that
// all types match properly.
//
var exprFinder = new ExpressionFunctionExpander();
var expanded = exprFinder.Visit(expression);
var result = new PartialEvaluatingExpressionTreeProcessor(new EvaluatableExpressionFilterAll()).Process(expanded);
return(result);
}
