Add support for 'any' operator and fix a bug in pattern matching.

ICSharpCode.NRefactory/CSharp/Ast/AstNodeCollection.cs

@@ -187,7 +187,8 @@ namespace ICSharpCode.NRefactory.CSharp
 						success = cur1.DoMatch(cur2, match);
 					}
 					cur1 = cur1.NextSibling;
-					cur2 = cur2.NextSibling;
+					if (cur2 != null)
+						cur2 = cur2.NextSibling;
 				}
 				while (cur2 != null && cur2.Role != role)
 					cur2 = cur2.NextSibling;

ICSharpCode.NRefactory/CSharp/Ast/Expressions/AssignmentExpression.cs

@@ -75,7 +75,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
 			AssignmentExpression o = other as AssignmentExpression;
-			return o != null && this.Left.DoMatch(o.Left, match) && this.Operator == o.Operator && this.Right.DoMatch(o.Right, match);
+			return o != null && (this.Operator == AssignmentOperatorType.Any || this.Operator == o.Operator)
+				&& this.Left.DoMatch(o.Left, match) && this.Right.DoMatch(o.Right, match);
 		}
 		
 		public static string GetOperatorSymbol(AssignmentOperatorType op)
@@ -136,5 +137,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		BitwiseOr,
 		/// <summary>left ^= right</summary>
 		ExclusiveOr,
+		
+		/// <summary>Any operator (for pattern matching)</summary>
+		Any
 	}
 }

ICSharpCode.NRefactory/CSharp/Ast/Expressions/BinaryOperatorExpression.cs

@@ -75,7 +75,8 @@ namespace ICSharpCode.NRefactory.CSharp
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
 			BinaryOperatorExpression o = other as BinaryOperatorExpression;
-			return o != null && this.Left.DoMatch(o.Left, match) && this.Operator == o.Operator && this.Right.DoMatch(o.Right, match);
+			return o != null && (this.Operator == BinaryOperatorType.Any || this.Operator == o.Operator)
+				&& this.Left.DoMatch(o.Left, match) && this.Right.DoMatch(o.Right, match);
 		}
 		
 		public static string GetOperatorSymbol(BinaryOperatorType op)
@@ -173,6 +174,11 @@ namespace ICSharpCode.NRefactory.CSharp
 		ShiftRight,
 		
 		/// <summary>left ?? right</summary>
-		NullCoalescing
+		NullCoalescing,
+		
+		/// <summary>
+		/// Any binary operator (used in pattern matching)
+		/// </summary>
+		Any
 	}
 }

ICSharpCode.NRefactory/CSharp/Ast/Expressions/PrimitiveExpression.cs

@@ -31,6 +31,8 @@ namespace ICSharpCode.NRefactory.CSharp
 	/// </summary>
 	public class PrimitiveExpression : Expression
 	{
+		public static readonly object AnyValue = new object();
+		
 		AstLocation startLocation;
 		public override AstLocation StartLocation {
 			get {
@@ -70,7 +72,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
 		{
 			PrimitiveExpression o = other as PrimitiveExpression;
-			return o != null && object.Equals(this.Value, o.Value);
+			return o != null && (this.Value == AnyValue || object.Equals(this.Value, o.Value));
 		}
 	}
 }