Revert "[AST] Handled protected and/or internal on AST level."

"protected internal" and "internal protected" are the same thing in C#.
Both map to ProtectedOrInternal; the ProtectedAndInternal accessibility is
not usable from C#.
This reverts commit b5ad2882ca.

ICSharpCode.NRefactory.CSharp/Ast/CSharpModifierToken.cs

@@ -61,7 +61,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		// Not worth using a dictionary for such few elements.
 		// This table is sorted in the order that modifiers should be output when generating code.
 		static readonly Modifiers[] allModifiers = {
-			Modifiers.Public, Modifiers.Internal, Modifiers.Protected, Modifiers.Private, Modifiers.ProtectedAndInternal,
+			Modifiers.Public, Modifiers.Protected, Modifiers.Private, Modifiers.Internal,
 			Modifiers.New,
 			Modifiers.Unsafe,
 			Modifiers.Abstract, Modifiers.Virtual, Modifiers.Sealed, Modifiers.Static, Modifiers.Override,
@@ -89,8 +89,6 @@ namespace ICSharpCode.NRefactory.CSharp
 					return "internal";
 				case Modifiers.Protected:
 					return "protected";
-				case Modifiers.ProtectedAndInternal:
-					return "internal protected";
 				case Modifiers.Public:
 					return "public";
 				case Modifiers.Abstract:

ICSharpCode.NRefactory.CSharp/Ast/Modifiers.cs

@@ -55,9 +55,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		Unsafe    = 0x8000,
 		Async     = 0x10000,
 		
-		ProtectedOrInternal = Protected  | Internal,
+		VisibilityMask = Private | Internal | Protected | Public,
-		ProtectedAndInternal = 0x20000,
-		VisibilityMask = Private | Internal | Protected | Public | ProtectedAndInternal,
 		
 		/// <summary>
 		/// Special value used to match any modifiers during pattern matching.

ICSharpCode.NRefactory.CSharp/Ast/TypeMembers/EntityDeclaration.cs

@@ -76,12 +76,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 			Modifiers m = 0;
 			foreach (CSharpModifierToken t in node.GetChildrenByRole (ModifierRole)) {
-				if (t.Modifier == Modifiers.Internal && m.HasFlag (Modifiers.Protected)) {
-					m = (m & ~Modifiers.Protected) | Modifiers.ProtectedAndInternal;
-				} else {
 				m |= t.Modifier;
 			}
-			}
 			return m;
 		}
 		
@@ -93,42 +89,21 @@ namespace ICSharpCode.NRefactory.CSharp
 				if ((m & newValue) != 0) {
 					if ((m & oldValue) == 0) {
 						// Modifier was added
-						if (m == Modifiers.ProtectedAndInternal) {
-							// This modifier is a special case - it consists out of 2 tokens. 
-							// note that protected or internal is  handled by the ordering of the AllModifiers array.
-							var newToken = new CSharpModifierToken(TextLocation.Empty, Modifiers.Protected);
-							node.InsertChildAfter(insertionPos, newToken, ModifierRole);
-							insertionPos = newToken;
-
-							newToken = new CSharpModifierToken(TextLocation.Empty, Modifiers.Internal);
-							node.InsertChildAfter(insertionPos, newToken, ModifierRole);
-							insertionPos = newToken;
-						} else {
 						var newToken = new CSharpModifierToken(TextLocation.Empty, m);
 						node.InsertChildAfter(insertionPos, newToken, ModifierRole);
 						insertionPos = newToken;
-						}
 					} else {
 						// Modifier already exists
-						if (m == Modifiers.ProtectedAndInternal) {
-							insertionPos = node.GetChildrenByRole(ModifierRole).First(t => t.Modifier == Modifiers.Internal);
-						} else {
 						insertionPos = node.GetChildrenByRole(ModifierRole).First(t => t.Modifier == m);
 					}
-					}
 				} else {
 					if ((m & oldValue) != 0) {
 						// Modifier was removed
-						if (m == Modifiers.ProtectedAndInternal) {
-							node.GetChildrenByRole (ModifierRole).First(t => t.Modifier == Modifiers.Protected).Remove();
-							node.GetChildrenByRole (ModifierRole).First(t => t.Modifier == Modifiers.Internal).Remove();
-						} else {
 						node.GetChildrenByRole (ModifierRole).First(t => t.Modifier == m).Remove();
 					}
 				}
 			}
 		}
-		}
 		
 		protected bool MatchAttributesAndModifiers (EntityDeclaration o, PatternMatching.Match match)
 		{

ICSharpCode.NRefactory.CSharp/Parser/CSharpParser.cs

@@ -1093,22 +1093,14 @@ namespace ICSharpCode.NRefactory.CSharp
 			{
 				if (location == null || location.Modifiers == null)
 					return;
-				Modifiers entityModifierMask = Modifiers.None;
 				foreach (var modifier in location.Modifiers) {
 					ICSharpCode.NRefactory.CSharp.Modifiers mod;
 					if (!modifierTable.TryGetValue (modifier.Item1, out mod)) {
 						Console.WriteLine ("modifier " + modifier.Item1 + " can't be converted,");
 					}
 					
-					if (mod == Modifiers.Internal && entityModifierMask.HasFlag (Modifiers.Protected)) {
-						entityModifierMask = (entityModifierMask & ~Modifiers.Protected) | Modifiers.ProtectedAndInternal;
-					} else {
-						entityModifierMask |= mod;
-					}
-					
 					parent.AddChild (new CSharpModifierToken (Convert (modifier.Item2), mod), EntityDeclaration.ModifierRole);
 				}
-				parent.Modifiers |= entityModifierMask;
 			}
 			
 			public override void Visit (Property p)

ICSharpCode.NRefactory.CSharp/Refactoring/TypeSystemAstBuilder.cs

@@ -753,9 +753,8 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 				case Accessibility.Internal:
 					return Modifiers.Internal;
 				case Accessibility.ProtectedOrInternal:
-					return Modifiers.ProtectedOrInternal;
 				case Accessibility.ProtectedAndInternal:
-					return Modifiers.ProtectedAndInternal;
+					return Modifiers.Protected | Modifiers.Internal;
 				default:
 					return Modifiers.None;
 			}

ICSharpCode.NRefactory.CSharp/TypeSystem/TypeSystemConvertVisitor.cs

@@ -829,12 +829,10 @@ namespace ICSharpCode.NRefactory.CSharp.TypeSystem
 			switch (modifiers & Modifiers.VisibilityMask) {
 				case Modifiers.Private:
 					return Accessibility.Private;
-				case Modifiers.ProtectedOrInternal: // Modifiers.Protected | Modifiers.Internal
-					return Accessibility.ProtectedOrInternal;
-				case Modifiers.ProtectedAndInternal:
-					return Accessibility.ProtectedAndInternal;
 				case Modifiers.Internal:
 					return Accessibility.Internal;
+				case Modifiers.Protected | Modifiers.Internal:
+					return Accessibility.ProtectedOrInternal;
 				case Modifiers.Protected:
 					return Accessibility.Protected;
 				case Modifiers.Public:

ICSharpCode.NRefactory.Tests/CSharp/Parser/TypeMembers/FieldDeclarationTests.cs

@@ -87,31 +87,5 @@ namespace ICSharpCode.NRefactory.CSharp.Parser.TypeMembers
 					}
 				});
 		}
-
-		[Test]
-		public void InternalAndProtectedFieldTest()
-		{
-			ParseUtilCSharp.AssertTypeMember(
-				"protected internal int myField;",
-				new FieldDeclaration {
-				Modifiers =  Modifiers.ProtectedAndInternal,
-				ReturnType = new PrimitiveType("int"),
-				Variables = { new VariableInitializer("myField") }
-			}
-			);
-		}
-
-		[Test]
-		public void InternalOrProtectedFieldTest()
-		{
-			ParseUtilCSharp.AssertTypeMember(
-				"internal protected int myField;",
-				new FieldDeclaration {
-				Modifiers =  Modifiers.ProtectedOrInternal,
-				ReturnType = new PrimitiveType("int"),
-				Variables = { new VariableInitializer("myField") }
-			}
-			);
-		}
 	}
 }