/// <summary>
/// Normalizes the <paramref name="methodDeclaration" /> and adds the generated members.
/// </summary>
/// <param name="methodDeclaration">The method declaration that should be normalized.</param>
private MethodDeclarationSyntax NormalizeExternMethod(MethodDeclarationSyntax methodDeclaration)
{
var originalDeclaration = methodDeclaration;
var methodDelegate = CreateDelegate(methodDeclaration);
var methodField = CreateField(methodDelegate);
// Add the [Required] attribute if it is not already present
if (!methodDeclaration.HasAttribute<RequiredAttribute>(SemanticModel))
{
methodDeclaration = methodDeclaration.RemoveTrivia();
methodDeclaration = methodDeclaration.WithAttributeLists(methodDeclaration.AttributeLists.Add(_requiredAttribute.WithTrailingSpace()));
}
// Remove the 'extern' keyword from the method
var externIndex = methodDeclaration.Modifiers.IndexOf(SyntaxKind.ExternKeyword);
methodDeclaration = methodDeclaration.WithModifiers(methodDeclaration.Modifiers.RemoveAt(externIndex));
// Add the [DebuggerHidden] attribute if it is not already present
if (!originalDeclaration.HasAttribute<DebuggerHiddenAttribute>(SemanticModel))
methodDeclaration = methodDeclaration.WithAttributeLists(methodDeclaration.AttributeLists.Add(_debuggerHiddenAttribute));
// Replace the method's body and ensure that we don't modify the line count of the containing type
methodDeclaration = AddBackingFieldAttribute(methodDeclaration);
methodDeclaration = ReplaceBodyWithDelegateInvocation(methodDeclaration);
methodDeclaration = methodDeclaration.NormalizeWhitespace();
methodDeclaration = methodDeclaration.WithTrivia(originalDeclaration);
++_portCount;
AddMembers(originalDeclaration.GetMethodSymbol(SemanticModel).ContainingType, methodField, methodDelegate);
return methodDeclaration.EnsureLineCount(originalDeclaration);
}