[Ast] Optimized GetNodeAt methods.

ICSharpCode.NRefactory.CSharp/Ast/AstNode.cs

@@ -654,19 +654,17 @@ namespace ICSharpCode.NRefactory.CSharp
 			AstNode node = this;
 			while (node.FirstChild != null) {
 				var child = node.FirstChild;
-				while (child != null) {
-					if (child.StartLocation <= location && location < child.EndLocation) {
+				while (child != null && child.EndLocation <= location)
+					child = child.nextSibling;
+				if (child != null && child.StartLocation <= location) {
 					if (pred == null || pred (child))
 						result = child;
 					node = child;
-						break;
-					}
-					child = child.NextSibling;
-				}
+				} else {
 					// found no better child node - therefore the parent is the right one.
-				if (child == null)
 					break;
 				}
+			}
 			return result;
 		}
 		
@@ -691,19 +689,17 @@ namespace ICSharpCode.NRefactory.CSharp
 			AstNode node = this;
 			while (node.FirstChild != null) {
 				var child = node.FirstChild;
-				while (child != null) {
-					if (child.StartLocation <= location && location < child.EndLocation) {
+				while (child != null && child.EndLocation <= location)
+					child = child.nextSibling;
+				if (child != null && child.StartLocation <= location) {
 					if (child is T)
 						result = (T)child;
 					node = child;
-						break;
-					}
-					child = child.NextSibling;
-				}
+				} else {
 					// found no better child node - therefore the parent is the right one.
-				if (child == null)
 					break;
 				}
+			}
 			return result;
 		}
 
@@ -731,19 +727,17 @@ namespace ICSharpCode.NRefactory.CSharp
 			AstNode node = this;
 			while (node.FirstChild != null) {
 				var child = node.FirstChild;
-				while (child != null) {
-					if (child.StartLocation <= location && location <= child.EndLocation) {
+				while (child != null && child.EndLocation < location)
+					child = child.nextSibling;
+				if (child != null && child.StartLocation <= location) {
 					if (pred == null || pred (child))
 						result = child;
 					node = child;
-						break;
-					}
-					child = child.NextSibling;
-				}
+				} else {
 					// found no better child node - therefore the parent is the right one.
-				if (child == null)
 					break;
 				}
+			}
 			return result;
 		}
 		
@@ -768,19 +762,17 @@ namespace ICSharpCode.NRefactory.CSharp
 			AstNode node = this;
 			while (node.FirstChild != null) {
 				var child = node.FirstChild;
-				while (child != null) {
-					if (child.StartLocation <= location && location < child.EndLocation) {
+				while (child != null && child.EndLocation < location)
+					child = child.nextSibling;
+				if (child != null && child.StartLocation <= location) {
 					if (child is T)
 						result = (T)child;
 					node = child;
-						break;
-					}
-					child = child.NextSibling;
-				}
+				} else {
 					// found no better child node - therefore the parent is the right one.
-				if (child == null)
 					break;
 				}
+			}
 			return result;
 		}
 		#endregion