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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.Text;
using System.Threading.Tasks;
using Tango.Transport.Web;

namespace Tango.MachineStudio.Common.Web
{
    public class CheckForUpdatesResponse : WebResponseMessage
    {
        public bool IsUpdateAvailable { get; set; }

        public String Version { get; set; }

        public String Comments { get; set; }

        public String BlobAddress { get; set; }

        public String CdnAddress { get; set; }
    }
}
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Input;

using Tango.Scripting.Editors.Document;
using Tango.Scripting.Editors.Editing;
using Tango.Scripting.Editors.Utils;

namespace Tango.Scripting.Editors.Snippets
{
	/// <summary>
	/// Represents the context of a snippet insertion.
	/// </summary>
	public class InsertionContext : IWeakEventListener
	{
		enum Status
		{
			Insertion,
			RaisingInsertionCompleted,
			Interactive,
			RaisingDeactivated,
			Deactivated
		}
		
		Status currentStatus = Status.Insertion;
		
		/// <summary>
		/// Creates a new InsertionContext instance.
		/// </summary>
		public InsertionContext(TextArea textArea, int insertionPosition)
		{
			if (textArea == null)
				throw new ArgumentNullException("textArea");
			this.TextArea = textArea;
			this.Document = textArea.Document;
			this.SelectedText = textArea.Selection.GetText();
			this.InsertionPosition = insertionPosition;
			this.startPosition = insertionPosition;
			
			DocumentLine startLine = this.Document.GetLineByOffset(insertionPosition);
			ISegment indentation = TextUtilities.GetWhitespaceAfter(this.Document, startLine.Offset);
			this.Indentation = Document.GetText(indentation.Offset, Math.Min(indentation.EndOffset, insertionPosition) - indentation.Offset);
			this.Tab = textArea.Options.IndentationString;
			
			this.LineTerminator = TextUtilities.GetNewLineFromDocument(this.Document, startLine.LineNumber);
		}
		
		/// <summary>
		/// Gets the text area.
		/// </summary>
		public TextArea TextArea { get; private set; }
		
		/// <summary>
		/// Gets the text document.
		/// </summary>
		public TextDocument Document { get; private set; }
		
		/// <summary>
		/// Gets the text that was selected before the insertion of the snippet.
		/// </summary>
		public string SelectedText { get; private set; }
		
		/// <summary>
		/// Gets the indentation at the insertion position.
		/// </summary>
		public string Indentation { get; private set; }
		
		/// <summary>
		/// Gets the indentation string for a single indentation level.
		/// </summary>
		public string Tab { get; private set; }
		
		/// <summary>
		/// Gets the line terminator at the insertion position.
		/// </summary>
		public string LineTerminator { get; private set; }
		
		/// <summary>
		/// Gets/Sets the insertion position.
		/// </summary>
		public int InsertionPosition { get; set; }
		
		readonly int startPosition;
		AnchorSegment wholeSnippetAnchor;
		bool deactivateIfSnippetEmpty;
		
		/// <summary>
		/// Gets the start position of the snippet insertion.
		/// </summary>
		public int StartPosition {
			get {
				if (wholeSnippetAnchor != null)
					return wholeSnippetAnchor.Offset;
				else
					return startPosition;
			}
		}
		
		/// <summary>
		/// Inserts text at the insertion position and advances the insertion position.
		/// This method will add the current indentation to every line in <paramref name="text"/> and will
		/// replace newlines with the expected newline for the document.
		/// </summary>
		public void InsertText(string text)
		{
			if (text == null)
				throw new ArgumentNullException("text");
			if (currentStatus != Status.Insertion)
				throw new InvalidOperationException();
			
			text = text.Replace("\t", this.Tab);
			
			using (this.Document.RunUpdate()) {
				int textOffset = 0;
				SimpleSegment segment;
				while ((segment = NewLineFinder.NextNewLine(text, textOffset)) != SimpleSegment.Invalid) {
					string insertString = text.Substring(textOffset, segment.Offset - textOffset)
						+ this.LineTerminator + this.Indentation;
					this.Document.Insert(InsertionPosition, insertString);
					this.InsertionPosition += insertString.Length;
					textOffset = segment.EndOffset;
				}
				string remainingInsertString = text.Substring(textOffset);
				this.Document.Insert(InsertionPosition, remainingInsertString);
				this.InsertionPosition += remainingInsertString.Length;
			}
		}
		
		Dictionary<SnippetElement, IActiveElement> elementMap = new Dictionary<SnippetElement, IActiveElement>();
		List<IActiveElement> registeredElements = new List<IActiveElement>();
		
		/// <summary>
		/// Registers an active element. Elements should be registered during insertion and will be called back
		/// when insertion has completed.
		/// </summary>
		/// <param name="owner">The snippet element that created the active element.</param>
		/// <param name="element">The active element.</param>
		public void RegisterActiveElement(SnippetElement owner, IActiveElement element)
		{
			if (owner == null)
				throw new ArgumentNullException("owner");
			if (element == null)
				throw new ArgumentNullException("element");
			if (currentStatus != Status.Insertion)
				throw new InvalidOperationException();
			elementMap.Add(owner, element);
			registeredElements.Add(element);
		}
		
		/// <summary>
		/// Returns the active element belonging to the specified snippet element, or null if no such active element is found.
		/// </summary>
		public IActiveElement GetActiveElement(SnippetElement owner)
		{
			if (owner == null)
				throw new ArgumentNullException("owner");
			IActiveElement element;
			if (elementMap.TryGetValue(owner, out element))
				return element;
			else
				return null;
		}
		
		/// <summary>
		/// Gets the list of active elements.
		/// </summary>
		public IEnumerable<IActiveElement> ActiveElements {
			get { return registeredElements; }
		}
		
		/// <summary>
		/// Calls the <see cref="IActiveElement.OnInsertionCompleted"/> method on all registered active elements
		/// and raises the <see cref="InsertionCompleted"/> event.
		/// </summary>
		/// <param name="e">The EventArgs to use</param>
		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate",
		                                                 Justification="There is an event and this method is raising it.")]
		public void RaiseInsertionCompleted(EventArgs e)
		{
			if (currentStatus != Status.Insertion)
				throw new InvalidOperationException();
			if (e == null)
				e = EventArgs.Empty;
			
			currentStatus = Status.RaisingInsertionCompleted;
			int endPosition = this.InsertionPosition;
			this.wholeSnippetAnchor = new AnchorSegment(Document, startPosition, endPosition - startPosition);
			TextDocumentWeakEventManager.UpdateFinished.AddListener(Document, this);
			deactivateIfSnippetEmpty = (endPosition != startPosition);
			
			foreach (IActiveElement element in registeredElements) {
				element.OnInsertionCompleted();
			}
			if (InsertionCompleted != null)
				InsertionCompleted(this, e);
			currentStatus = Status.Interactive;
			if (registeredElements.Count == 0) {
				// deactivate immediately if there are no interactive elements
				Deactivate(new SnippetEventArgs(DeactivateReason.NoActiveElements));
			} else {
				myInputHandler = new SnippetInputHandler(this);
				// disable existing snippet input handlers - there can be only 1 active snippet
				foreach (TextAreaStackedInputHandler h in TextArea.StackedInputHandlers) {
					if (h is SnippetInputHandler)
						TextArea.PopStackedInputHandler(h);
				}
				TextArea.PushStackedInputHandler(myInputHandler);
			}
		}
		
		SnippetInputHandler myInputHandler;
		
		/// <summary>
		/// Occurs when the all snippet elements have been inserted.
		/// </summary>
		public event EventHandler InsertionCompleted;
		
		/// <summary>
		/// Calls the <see cref="IActiveElement.Deactivate"/> method on all registered active elements.
		/// </summary>
		/// <param name="e">The EventArgs to use</param>
		public void Deactivate(SnippetEventArgs e)
		{
			if (currentStatus == Status.Deactivated || currentStatus == Status.RaisingDeactivated)
				return;
			if (currentStatus != Status.Interactive)
				throw new InvalidOperationException("Cannot call Deactivate() until RaiseInsertionCompleted() has finished.");
			if (e == null)
				e = new SnippetEventArgs(DeactivateReason.Unknown);
			
			TextDocumentWeakEventManager.UpdateFinished.RemoveListener(Document, this);
			currentStatus = Status.RaisingDeactivated;
			TextArea.PopStackedInputHandler(myInputHandler);
			foreach (IActiveElement element in registeredElements) {
				element.Deactivate(e);
			}
			if (Deactivated != null)
				Deactivated(this, e);
			currentStatus = Status.Deactivated;
		}
		
		/// <summary>
		/// Occurs when the interactive mode is deactivated.
		/// </summary>
		public event EventHandler<SnippetEventArgs> Deactivated;
		
		bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
		{
			return ReceiveWeakEvent(managerType, sender, e);
		}
		
		/// <inheritdoc cref="IWeakEventListener.ReceiveWeakEvent"/>
		protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
		{
			if (managerType == typeof(TextDocumentWeakEventManager.UpdateFinished)) {
				// Deactivate if snippet is deleted. This is necessary for correctly leaving interactive
				// mode if Undo is pressed after a snippet insertion.
				if (wholeSnippetAnchor.Length == 0 && deactivateIfSnippetEmpty)
					Deactivate(new SnippetEventArgs(DeactivateReason.Deleted));
				return true;
			}
			return false;
		}
	}
}