// Try to find a match from a set of methods
private void BindToMethod(ICollection <MethodInfo> methods, MemberElement previous, Type[] argTypes)
{
List <CustomMethodInfo> customInfos = new List <CustomMethodInfo>();
// Wrap the MethodInfos in our custom class
foreach (MethodInfo mi in methods)
{
CustomMethodInfo cmi = new CustomMethodInfo(mi);
customInfos.Add(cmi);
}
// Discard any methods that cannot qualify as overloads
CustomMethodInfo[] arr = customInfos.ToArray();
customInfos.Clear();
foreach (CustomMethodInfo cmi in arr)
{
if (cmi.IsMatch(argTypes) == true)
{
customInfos.Add(cmi);
}
}
if (customInfos.Count == 0)
{
// We have no methods that can qualify as overloads; throw exception
this.ThrowFunctionNotFoundException(previous);
}
else
{
// At least one method matches our criteria; do our custom overload resolution
this.ResolveOverloads(customInfos.ToArray(), previous, argTypes);
}
}
public InvocationListElement(IList elements, IServiceProvider services)
{
this.HandleFirstElement(elements, services);
LinkElements(elements);
Resolve(elements, services);
MyTail = elements[elements.Count - 1] as MemberElement;
}
// Find the best match from a set of overloaded methods
private void ResolveOverloads(CustomMethodInfo[] infos, MemberElement previous, Type[] argTypes)
{
// Compute a score for each candidate
foreach (CustomMethodInfo cmi in infos)
{
cmi.ComputeScore(argTypes);
}
// Sort array from best to worst matches
Array.Sort <CustomMethodInfo>(infos);
// Discard any matches that aren't accessible
infos = this.GetAccessibleInfos(infos);
// No accessible methods left
if (infos.Length == 0)
{
this.ThrowNoAccessibleMethodsException(previous);
}
// Handle case where we have more than one match with the same score
this.DetectAmbiguousMatches(infos);
// If we get here, then there is only one best match
MyTargetMethodInfo = infos[0];
}
public void Link(MemberElement nextElement)
{
MyNext = nextElement;
if ((nextElement != null))
{
nextElement.MyPrevious = this;
}
}
private void ThrowNoAccessibleMethodsException(MemberElement previous)
{
if (previous == null)
{
base.ThrowCompileException(CompileErrorResourceKeys.NoAccessibleMatches, CompileExceptionReason.AccessDenied, MyName, MyArguments);
}
else
{
base.ThrowCompileException(CompileErrorResourceKeys.NoAccessibleMatchesOnType, CompileExceptionReason.AccessDenied, MyName, MyArguments, previous.TargetType.Name);
}
}
private void ThrowFunctionNotFoundException(MemberElement previous)
{
if (previous == null)
{
base.ThrowCompileException(CompileErrorResourceKeys.UndefinedFunction, CompileExceptionReason.UndefinedName, MyName, MyArguments);
}
else
{
base.ThrowCompileException(CompileErrorResourceKeys.UndefinedFunctionOnType, CompileExceptionReason.UndefinedName, MyName, MyArguments, previous.TargetType.Name);
}
}
private void AddReferencedVariable(MemberElement previous)
{
if ((previous != null))
{
return;
}
if ((MyVariableType != null) || MyOptions.IsOwnerType(this.MemberOwnerType) == true)
{
ExpressionInfo info = MyServices.GetService(typeof(ExpressionInfo)) as ExpressionInfo;
info.AddReferencedVariable(MyName);
}
}
private bool ResolveVirtualProperty(MemberElement previous)
{
if (previous == null)
{
// We can't use virtual properties if we are the first element
return(false);
}
PropertyDescriptorCollection coll = TypeDescriptor.GetProperties(previous.ResultType);
MyPropertyDescriptor = coll.Find(MyName, true);
return(MyPropertyDescriptor != null);
}
// Arrange elements as a linked list
private static void LinkElements(IList elements)
{
for (int i = 0; i <= elements.Count - 1; i++)
{
MemberElement current = elements[i] as MemberElement;
MemberElement nextElement = null;
if (i + 1 < elements.Count)
{
nextElement = elements[i + 1] as MemberElement;
}
current.Link(nextElement);
}
}
public void EmitFunctionCall(bool nextRequiresAddress, FleeILGenerator ilg, IServiceProvider services)
{
ParameterInfo[] parameters = this.Method.GetParameters();
ExpressionElement[] elements = MyArguments.ToArray();
// Emit either a regular or paramArray call
if (MyTargetMethodInfo.IsParamArray == false)
{
this.EmitRegularFunctionInternal(parameters, elements, ilg, services);
}
else
{
this.EmitParamArrayArguments(parameters, elements, ilg, services);
}
MemberElement.EmitMethodCall(this.ResultType, nextRequiresAddress, this.Method, ilg);
}
private bool ResolveFieldProperty(MemberElement previous)
{
MemberInfo[] members = this.GetMembers(MemberTypes.Field | MemberTypes.Property);
// Keep only the ones which are accessible
members = this.GetAccessibleMembers(members);
if (members.Length == 0)
{
// No accessible members; try to resolve a virtual property
return(this.ResolveVirtualProperty(previous));
}
else if (members.Length > 1)
{
// More than one accessible member
if (previous == null)
{
base.ThrowCompileException(CompileErrorResourceKeys.IdentifierIsAmbiguous, CompileExceptionReason.AmbiguousMatch, MyName);
}
else
{
base.ThrowCompileException(CompileErrorResourceKeys.IdentifierIsAmbiguousOnType, CompileExceptionReason.AmbiguousMatch, MyName, previous.TargetType.Name);
}
}
else
{
// Only one member; bind to it
MyField = members[0] as FieldInfo;
if ((MyField != null))
{
return(true);
}
// Assume it must be a property
MyProperty = (PropertyInfo)members[0];
return(true);
}
return(false);
}
private void ResolveNamespaces(IList elements, IServiceProvider services)
{
ExpressionContext context = services.GetService(typeof(ExpressionContext)) as ExpressionContext;
ImportBase currentImport = context.Imports.RootImport;
while (true)
{
string name = GetName(elements);
if (name == null)
{
break; // TODO: might not be correct. Was : Exit While
}
ImportBase import = currentImport.FindImport(name);
if (import == null)
{
break; // TODO: might not be correct. Was : Exit While
}
currentImport = import;
elements.RemoveAt(0);
if (elements.Count > 0)
{
MemberElement newFirst = (MemberElement)elements[0];
newFirst.SetImport(currentImport);
}
}
if (elements.Count == 0)
{
base.ThrowCompileException(CompileErrorResourceKeys.NamespaceCannotBeUsedAsType, CompileExceptionReason.TypeMismatch, currentImport.Name);
}
}
protected static bool IsElementPublic(MemberElement e)
{
return(e.IsPublic);
}
public bool IsAccessible(MemberElement owner)
{
return(owner.IsMemberAccessible(MyTarget));
}