1 files changed, 113 insertions, 0 deletions
diff --git a/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Refactoring/ExtractMethodCommandHandler.cs b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Refactoring/ExtractMethodCommandHandler.cs
new file mode 100644
index 0000000000..f4cd6ae7d0
--- /dev/null
+++ b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Refactoring/ExtractMethodCommandHandler.cs
@@ -0,0 +1,113 @@
+//
+// ExtractMethodCommandHandler.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;
+using MonoDevelop.Components.Commands;
+using ICSharpCode.NRefactory6.CSharp.ExtractMethod;
+using MonoDevelop.Ide;
+using ICSharpCode.NRefactory6.CSharp;
+using System.Threading;
+using Microsoft.CodeAnalysis.Text;
+using System.Linq;
+using MonoDevelop.Refactoring;
+using MonoDevelop.Core;
+using System.Threading.Tasks;
+
+namespace MonoDevelop.CSharp.Refactoring
+{
+	class ExtractMethodCommandHandler : CommandHandler
+	{
+		public static async Task<bool> IsValid (MonoDevelop.Ide.Gui.Document doc, CancellationToken cancellationToken = default(CancellationToken))
+		{
+			if (doc == null)
+				return false;
+			if (doc.Editor == null || !doc.Editor.IsSomethingSelected)
+				return false;
+			var ad = doc.AnalysisDocument;
+			if (ad == null)
+				return false;
+			var selectionRange = doc.Editor.SelectionRange;
+			try {
+				var selection = new CSharpSelectionValidator (await SemanticDocument.CreateAsync (ad, cancellationToken).ConfigureAwait (false), new TextSpan (selectionRange.Offset, selectionRange.Length), doc.GetOptionSet ());
+				var result = await selection.GetValidSelectionAsync (cancellationToken).ConfigureAwait (false);
+				return result.ContainsValidContext;
+			} catch (Exception) {
+				return false;
+			}
+		}
+
+		protected async override void Update (CommandInfo info)
+		{
+			var doc = IdeApp.Workbench.ActiveDocument;
+			info.Enabled = await IsValid (doc);
+		}
+
+		public async static Task Run (MonoDevelop.Ide.Gui.Document doc)
+		{
+			if (!doc.Editor.IsSomethingSelected)
+				return;
+			var ad = doc.AnalysisDocument;
+			if (ad == null)
+				return;
+			try {
+				var selectionRange = doc.Editor.SelectionRange;
+				var token = default(CancellationToken);
+				var selection = new CSharpSelectionValidator (await SemanticDocument.CreateAsync (ad, token).ConfigureAwait (false), new TextSpan (selectionRange.Offset, selectionRange.Length), doc.GetOptionSet ());
+				var result = await selection.GetValidSelectionAsync (token).ConfigureAwait (false);
+				if (!result.ContainsValidContext)
+					return;
+				var extractor = new CSharpMethodExtractor ((CSharpSelectionResult)result);
+				var extractionResult = await extractor.ExtractMethodAsync (token).ConfigureAwait (false);
+				var changes = await extractionResult.Document.GetTextChangesAsync (ad, token);
+				using (var undo = doc.Editor.OpenUndoGroup ()) {
+					foreach (var change in changes.OrderByDescending (ts => ts.Span.Start)) {
+						doc.Editor.ReplaceText (change.Span.Start, change.Span.Length, change.NewText);
+					}
+					// hack to remove the redundant private modifier.
+					if (doc.Editor.GetTextAt (extractionResult.MethodDeclarationNode.SpanStart, "private ".Length) == "private ") {
+						doc.Editor.RemoveText (extractionResult.MethodDeclarationNode.SpanStart, "private ".Length);
+					}
+				}
+				doc.UpdateParseDocument ();
+				var info = RefactoringSymbolInfo.GetSymbolInfoAsync (doc, extractionResult.InvocationNameToken.Span.Start).Result;
+				var sym = info.DeclaredSymbol ?? info.Symbol;
+				if (sym != null)
+					new MonoDevelop.Refactoring.Rename.RenameRefactoring ().Rename (sym);
+			}
+			catch (Exception e) {
+				LoggingService.LogError ("Error while extracting method", e);
+			}
+		}
+
+		protected async override void Run ()
+		{
+			var doc = IdeApp.Workbench.ActiveDocument;
+			if (doc == null)
+				return;
+			await Run (doc);
+		}
+	}
+}
+