1 files changed, 87 insertions, 0 deletions
diff --git a/main/src/addins/CSharpBinding/MonoDevelop.CSharp.CodeFixes/Async/AbstractAsyncCodeFix.cs b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.CodeFixes/Async/AbstractAsyncCodeFix.cs
new file mode 100644
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+++ b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.CodeFixes/Async/AbstractAsyncCodeFix.cs
@@ -0,0 +1,87 @@
+//
+// AbstractAsyncCodeFix.cs
+//
+// Author:
+//       Mike Krüger <mkrueger@xamarin.com>
+//
+// Copyright (c) 2015 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.Collections.Immutable;
+using System.Linq;
+using System.Composition;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.CodeFixes;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Microsoft.CodeAnalysis.Formatting;
+using Roslyn.Utilities;
+using Microsoft.CodeAnalysis.FindSymbols;
+using Microsoft.CodeAnalysis.CodeActions;
+using ICSharpCode.NRefactory6.CSharp;
+using MonoDevelop.CSharp.CodeFixes;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+
+namespace MonoDevelop.CSharp.CodeFixes
+{
+
+	internal abstract partial class AbstractAsyncCodeFix : CodeFixProvider
+	{
+		protected abstract Task<CodeAction> GetCodeFix(SyntaxNode root, SyntaxNode node, Document document, Diagnostic diagnostic, CancellationToken cancellationToken);
+
+		public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
+		{
+			var model = await context.Document.GetSemanticModelAsync(context.CancellationToken).ConfigureAwait (false);
+			if (model.IsFromGeneratedCode (context.CancellationToken))
+				return;
+			var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
+
+			SyntaxNode node;
+			if (!TryGetNode(root, context.Span, out node))
+			{
+				return;
+			}
+
+			var diagnostic = context.Diagnostics.FirstOrDefault();
+
+			var codeAction = await GetCodeFix(root, node, context.Document, diagnostic, context.CancellationToken).ConfigureAwait(false);
+
+			if (codeAction != null)
+			{
+				context.RegisterCodeFix(codeAction, diagnostic);
+			}
+		}
+
+		private bool TryGetNode(SyntaxNode root, Microsoft.CodeAnalysis.Text.TextSpan span, out SyntaxNode node)
+		{
+			node = null;
+			var ancestors = root.FindToken(span.Start).GetAncestors<SyntaxNode>();
+			if (!ancestors.Any())
+			{
+				return false;
+			}
+
+			node = ancestors.FirstOrDefault(n => n.Span.Contains(span) && n != root);
+			return node != null;
+		}
+	}
+	
+}