Add support for Modifiers.Any (for pattern-matching) and for AttributeSection patterns.

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/CSharpModifierToken.cs

@@ -72,7 +72,10 @@ namespace ICSharpCode.NRefactory.CSharp
 			new KeyValuePair<Modifiers, int>(Modifiers.Volatile, "volatile".Length),
 			new KeyValuePair<Modifiers, int>(Modifiers.Extern, "extern".Length),
 			new KeyValuePair<Modifiers, int>(Modifiers.Partial, "partial".Length),
-			new KeyValuePair<Modifiers, int>(Modifiers.Const, "const".Length)
+			new KeyValuePair<Modifiers, int>(Modifiers.Const, "const".Length),
+			
+			// even though it's used for patterns only, it needs to be in this table to be usable in the AST
+			new KeyValuePair<Modifiers, int>(Modifiers.Any, "any".Length)
 		};
 		
 		public static IEnumerable<Modifiers> AllModifiers {

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/Modifiers.cs

@@ -66,4 +66,9 @@ namespace ICSharpCode.NRefactory.CSharp
 		//Final                = 0x400000,
 		//Literal              = 0x800000,
 		VisibilityMask = Private | Internal | Protected | Public,
+		
+		/// <summary>
+		/// Special value used to match any modifiers during pattern matching.
+		/// </summary>
+		Any = unchecked((int)0x80000000)
 	}}

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/PatternMatching/Pattern.cs

@@ -64,6 +64,11 @@ namespace ICSharpCode.NRefactory.CSharp.PatternMatching
 			return p != null ? new VariablePlaceholder(p) : null;
 		}
 		
+		public static implicit operator AttributeSection(Pattern p)
+		{
+			return p != null ? new AttributeSectionPlaceholder(p) : null;
+		}
+		
 		// Make debugging easier by giving Patterns a ToString() implementation
 		public override string ToString()
 		{

NRefactory/ICSharpCode.NRefactory/CSharp/Ast/PatternMatching/Placeholder.cs

@@ -152,4 +152,33 @@ namespace ICSharpCode.NRefactory.CSharp.PatternMatching
 			return child.DoMatchCollection(role, pos, match, backtrackingStack);
 		}
 	}
+	
+	sealed class AttributeSectionPlaceholder : AttributeSection
+	{
+		readonly AstNode child;
+		
+		public AttributeSectionPlaceholder(AstNode child)
+		{
+			this.child = child;
+		}
+		
+		public override NodeType NodeType {
+			get { return NodeType.Placeholder; }
+		}
+		
+		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
+		{
+			return ((IPatternAstVisitor<T, S>)visitor).VisitPlaceholder(this, child, data);
+		}
+		
+		protected internal override bool DoMatch(AstNode other, Match match)
+		{
+			return child.DoMatch(other, match);
+		}
+		
+		internal override bool DoMatchCollection(Role role, AstNode pos, Match match, Stack<Pattern.PossibleMatch> backtrackingStack)
+		{
+			return child.DoMatchCollection(role, pos, match, backtrackingStack);
+		}
+	}
 }

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

@@ -60,7 +60,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		
 		protected bool MatchAttributesAndModifiers(AttributedNode o, PatternMatching.Match match)
 		{
-			return this.Modifiers == o.Modifiers && this.Attributes.DoMatch(o.Attributes, match);
+			return (this.Modifiers == Modifiers.Any || this.Modifiers == o.Modifiers) && this.Attributes.DoMatch(o.Attributes, match);
 		}
 	}
 }