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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Scripting.Editors.Intellisense;

namespace Tango.Scripting.Editors
{
    public class CachedUsing
    {
        public String Namespace { get; set; }
        public List<KnownType> KnownTypes { get; set; }

        public CachedUsing()
        {
            KnownTypes =pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
// 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 Tango.Scripting.Editors.Utils;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows.Input;

namespace Tango.Scripting.Editors.Editing
{
	/// <summary>
	/// A set of input bindings and event handlers for the text area.
	/// </summary>
	/// <remarks>
	/// <para>
	/// There is one active input handler per text area (<see cref="Editing.TextArea.ActiveInputHandler"/>), plus
	/// a number of active stacked input handlers.
	/// </para>
	/// <para>
	/// The text area also stores a reference to a default input handler, but that is not necessarily active.
	/// </para>
	/// <para>
	/// Stacked input handlers work in addition to the set of currently active handlers (without detaching them).
	/// They are detached in the reverse order of being attached.
	/// </para>
	/// </remarks>
	public interface ITextAreaInputHandler
	{
		/// <summary>
		/// Gets the text area that the input handler belongs to.
		/// </summary>
		TextArea TextArea {
			get;
		}
		
		/// <summary>
		/// Attaches an input handler to the text area.
		/// </summary>
		void Attach();
		
		/// <summary>
		/// Detaches the input handler from the text area.
		/// </summary>
		void Detach();
	}
	
	/// <summary>
	/// Stacked input handler.
	/// Uses OnEvent-methods instead of registering event handlers to ensure that the events are handled in the correct order.
	/// </summary>
	public abstract class TextAreaStackedInputHandler : ITextAreaInputHandler
	{
		readonly TextArea textArea;
		
		/// <inheritdoc/>
		public TextArea TextArea {
			get { return textArea; }
		}
		
		/// <summary>
		/// Creates a new TextAreaInputHandler.
		/// </summary>
		protected TextAreaStackedInputHandler(TextArea textArea)
		{
			if (textArea == null)
				throw new ArgumentNullException("textArea");
			this.textArea = textArea;
		}
		
		/// <inheritdoc/>
		public virtual void Attach()
		{
		}
		
		/// <inheritdoc/>
		public virtual void Detach()
		{
		}
		
		/// <summary>
		/// Called for the PreviewKeyDown event.
		/// </summary>
		public virtual void OnPreviewKeyDown(KeyEventArgs e)
		{
		}
		
		/// <summary>
		/// Called for the PreviewKeyUp event.
		/// </summary>
		public virtual void OnPreviewKeyUp(KeyEventArgs e)
		{
		}
	}
	
	/// <summary>
	/// Default-implementation of <see cref="ITextAreaInputHandler"/>.
	/// </summary>
	/// <remarks><inheritdoc cref="ITextAreaInputHandler"/></remarks>
	public class TextAreaInputHandler : ITextAreaInputHandler
	{
		readonly ObserveAddRemoveCollection<CommandBinding> commandBindings;
		readonly ObserveAddRemoveCollection<InputBinding> inputBindings;
		readonly ObserveAddRemoveCollection<ITextAreaInputHandler> nestedInputHandlers;
		readonly TextArea textArea;
		bool isAttached;
		
		/// <summary>
		/// Creates a new TextAreaInputHandler.
		/// </summary>
		public TextAreaInputHandler(TextArea textArea)
		{
			if (textArea == null)
				throw new ArgumentNullException("textArea");
			this.textArea = textArea;
			commandBindings = new ObserveAddRemoveCollection<CommandBinding>(CommandBinding_Added, CommandBinding_Removed);
			inputBindings = new ObserveAddRemoveCollection<InputBinding>(InputBinding_Added, InputBinding_Removed);
			nestedInputHandlers = new ObserveAddRemoveCollection<ITextAreaInputHandler>(NestedInputHandler_Added, NestedInputHandler_Removed);
		}
		
		/// <inheritdoc/>
		public TextArea TextArea {
			get { return textArea; }
		}
		
		/// <summary>
		/// Gets whether the input handler is currently attached to the text area.
		/// </summary>
		public bool IsAttached {
			get { return isAttached; }
		}
		
		#region CommandBindings / InputBindings
		/// <summary>
		/// Gets the command bindings of this input handler.
		/// </summary>
		public ICollection<CommandBinding> CommandBindings {
			get { return commandBindings; }
		}
		
		void CommandBinding_Added(CommandBinding commandBinding)
		{
			if (isAttached)
				textArea.CommandBindings.Add(commandBinding);
		}
		
		void CommandBinding_Removed(CommandBinding commandBinding)
		{
			if (isAttached)
				textArea.CommandBindings.Remove(commandBinding);
		}
		
		/// <summary>
		/// Gets the input bindings of this input handler.
		/// </summary>
		public ICollection<InputBinding> InputBindings {
			get { return inputBindings; }
		}
		
		void InputBinding_Added(InputBinding inputBinding)
		{
			if (isAttached)
				textArea.InputBindings.Add(inputBinding);
		}
		
		void InputBinding_Removed(InputBinding inputBinding)
		{
			if (isAttached)
				textArea.InputBindings.Remove(inputBinding);
		}
		
		/// <summary>
		/// Adds a command and input binding.
		/// </summary>
		/// <param name="command">The command ID.</param>
		/// <param name="modifiers">The modifiers of the keyboard shortcut.</param>
		/// <param name="key">The key of the keyboard shortcut.</param>
		/// <param name="handler">The event handler to run when the command is executed.</param>
		public void AddBinding(ICommand command, ModifierKeys modifiers, Key key, ExecutedRoutedEventHandler handler)
		{
			this.CommandBindings.Add(new CommandBinding(command, handler));
			this.InputBindings.Add(new KeyBinding(command, key, modifiers));
		}
		#endregion
		
		#region NestedInputHandlers
		/// <summary>
		/// Gets the collection of nested input handlers. NestedInputHandlers are activated and deactivated
		/// together with this input handler.
		/// </summary>
		public ICollection<ITextAreaInputHandler> NestedInputHandlers {
			get { return nestedInputHandlers; }
		}
		
		void NestedInputHandler_Added(ITextAreaInputHandler handler)
		{
			if (handler == null)
				throw new ArgumentNullException("handler");
			if (handler.TextArea != textArea)
				throw new ArgumentException("The nested handler must be working for the same text area!");
			if (isAttached)
				handler.Attach();
		}
		
		void NestedInputHandler_Removed(ITextAreaInputHandler handler)
		{
			if (isAttached)
				handler.Detach();
		}
		#endregion
		
		#region Attach/Detach
		/// <inheritdoc/>
		public virtual void Attach()
		{
			if (isAttached)
				throw new InvalidOperationException("Input handler is already attached");
			isAttached = true;
			
			textArea.CommandBindings.AddRange(commandBindings);
			textArea.InputBindings.AddRange(inputBindings);
			foreach (ITextAreaInputHandler handler in nestedInputHandlers)
				handler.Attach();
		}
		
		/// <inheritdoc/>
		public virtual void Detach()
		{
			if (!isAttached)
				throw new InvalidOperationException("Input handler is not attached");
			isAttached = false;
			
			foreach (CommandBinding b in commandBindings)
				textArea.CommandBindings.Remove(b);
			foreach (InputBinding b in inputBindings)
				textArea.InputBindings.Remove(b);
			foreach (ITextAreaInputHandler handler in nestedInputHandlers)
				handler.Detach();
		}
		#endregion
	}
}