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/********************************************************************++

Copyright (c) Microsoft Corporation. All rights reserved.

--********************************************************************/

using System;

using System.Text;

namespace Microsoft.PowerShell.Internal

{

internal class VirtualTerminal : IConsole

{

// These two fields are used by PowerShellEditorServices to inject a

// custom ReadKey implementation. This is not a public API, but it is

// part of a private contract with that project.

#pragma warning disable CS0649

private static Func<bool, ConsoleKeyInfo> _readKeyOverride;

#pragma warning restore CS0649

private static Lazy<Func<bool, ConsoleKeyInfo>> _readKeyMethod = new Lazy<Func<bool, ConsoleKeyInfo>>(

() => _readKeyOverride == null ? Console.ReadKey : _readKeyOverride);

public int CursorLeft

{

get => Console.CursorLeft;

set => Console.CursorLeft = value;

}

public int CursorTop

{

get => Console.CursorTop;

set => Console.CursorTop = value;

}

// .NET doesn't implement this API, so we fake it with a commonly supported escape sequence.

protected int _unixCursorSize = 25;

public virtual int CursorSize

{

get => PlatformWindows.IsConsoleApiAvailable(input: false, output: true) ? Console.CursorSize : _unixCursorSize;

set

{

if (PlatformWindows.IsConsoleApiAvailable(input: false, output: true))

{

Console.CursorSize = value;

}

else

{

_unixCursorSize = value;

// Solid blinking block or blinking vertical bar

Write(value > 50 ? "\x1b[2 q" : "\x1b[5 q");

}

}

}

public bool CursorVisible

{

get => Console.CursorVisible;

set => Console.CursorVisible = value;

}

public int BufferWidth

{

get => Console.BufferWidth;

set => Console.BufferWidth = value;

}

public int BufferHeight

{

get => Console.BufferHeight;

set => Console.BufferHeight = value;

}

public int WindowWidth

{

get => Console.WindowWidth;

set => Console.WindowWidth = value;

}

public int WindowHeight

{

get => Console.WindowHeight;

set => Console.WindowHeight = value;

}

public int WindowTop

{

get => Console.WindowTop;

set => Console.WindowTop = value;

}

public ConsoleColor BackgroundColor

{

get => Console.BackgroundColor;

set => Console.BackgroundColor = value;

}

public ConsoleColor ForegroundColor

{

get => Console.ForegroundColor;

set => Console.ForegroundColor = value;

}

public Encoding OutputEncoding

{

// Catch and ignore exceptions - if we can't change the encoding, output is

// probably redirected, but it can also happen with the legacy console on Windows.

get { try { return Console.OutputEncoding; } catch { return Encoding.Default; } }

set { try { Console.OutputEncoding = value; } catch { } }

}

public ConsoleKeyInfo ReadKey() => _readKeyMethod.Value(true);

public bool KeyAvailable => Console.KeyAvailable;

public void SetWindowPosition(int left, int top) => Console.SetWindowPosition(left, top);

public void SetCursorPosition(int left, int top) => Console.SetCursorPosition(left, top);

public virtual void Write(string value) => Console.Write(value);

public virtual void WriteLine(string value) => Console.WriteLine(value);

public virtual void BlankRestOfLine() => Console.Write("\x1b[K");

}

}