/NRefactory/ICSharpCode.NRefactory.CSharp/Refactoring/ContextAction/ReplaceEmptyString.cs

 1// 
 2// ReplaceEmptyString.cs
 3//  
 4// Author:
 5//       Mike Kr?ger <mkrueger@novell.com>
 6// 
 7// Copyright (c) 2011 Mike Kr?ger <mkrueger@novell.com>
 8// 
 9// Permission is hereby granted, free of charge, to any person obtaining a copy
10// of this software and associated documentation files (the "Software"), to deal
11// in the Software without restriction, including without limitation the rights
12// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13// copies of the Software, and to permit persons to whom the Software is
14// furnished to do so, subject to the following conditions:
15// 
16// The above copyright notice and this permission notice shall be included in
17// all copies or substantial portions of the Software.
18// 
19// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25// THE SOFTWARE.
26using System;
27
28namespace ICSharpCode.NRefactory.CSharp.Refactoring
29{
30	public class ReplaceEmptyString : IContextAction
31	{
32		public bool IsValid (RefactoringContext context)
33		{
34			return GetEmptyString (context) != null;
35		}
36		
37		public void Run (RefactoringContext context)
38		{
39			var expr = GetEmptyString (context);
40			using (var script = context.StartScript ()) {
41				script.Replace (expr, new MemberReferenceExpression (new TypeReferenceExpression (new PrimitiveType ("string")), "Empty"));
42			}
43		}
44		
45		static PrimitiveExpression GetEmptyString (RefactoringContext context)
46		{
47			var node = context.GetNode<PrimitiveExpression> ();
48			if (node == null || !(node.Value is string) || node.Value.ToString () != "")
49				return null;
50			return  node;
51		}
52	}
53}