ConvertForToWhileAction.cs

//
// ConvertForToWhileAction.cs
//
// Author:
//       Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2013 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Linq;

namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
	[ContextAction("Convert 'for' loop to 'while'", Description = "Works on 'for' loops.")]
	public class ConvertForToWhileAction : SpecializedCodeAction<ForStatement>
	{
		protected override CodeAction GetAction(RefactoringContext context, ForStatement node)
		{
			if (!node.ForToken.Contains(context.Location))
				return null;
			return new CodeAction(
				context.TranslateString("Convert to 'while'"),
				script => {
					var body = node.EmbeddedStatement.Clone();
					var blockStatement = body as BlockStatement ?? new BlockStatement { Statements = { body } };
					blockStatement.Statements.AddRange(node.Iterators.Select(i => i.Clone ()));
					var whileStatement = new WhileStatement(node.Condition.IsNull ? new PrimitiveExpression(true) : node.Condition.Clone(), blockStatement);
					foreach (var init in node.Initializers) {
						var stmt = init.Clone();
						stmt.Role = BlockStatement.StatementRole;
						script.InsertBefore(node, stmt);
					}
					script.Replace(node, whileStatement);
				},
				node
			);
		}
	}
}