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Console.cs
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Console.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using Cosmos.HAL;
using Cosmos.System.IO;
using static Cosmos.System.Console;
#nullable enable
namespace Cosmos.System
{
/// <summary>
/// Represents the standard console output stream.
/// </summary>
public partial class Console
{
private const byte LineFeed = (byte)'\n';
private const byte CarriageReturn = (byte)'\r';
private const byte Tab = (byte)'\t';
private const byte Space = (byte)' ';
private const int WriteBufferSize = 256;
private const int NumberOfSpacesForTab = 4;
private SyncTextReader? _stdInReader;
private Stream? stdOut, stdIn, stdError;
/// <summary>
/// The underlying X cursor location field.
/// </summary>
protected int mX = 0;
/// <summary>
/// The underlying Cached X cursor location field.
/// </summary>
protected int cX = 0;
/// <summary>
/// The text cursor location in the X (horizontal) axis.
/// </summary>
public int X
{
get => mX;
set
{
if (value < 0)
{
if (mY > 0)
{
mY--;
}
mX = Cols - 1;
}
else if (value >= mText.Cols)
{
cY = mY;
DoLineFeed();
mY = cY;
mX = cX;
}
else
{
mX = value;
}
UpdateCursor();
}
}
/// <summary>
/// The text cached cursor location in the X (horizontal) axis.
/// </summary>
public int CachedX
{
get => cX;
set
{
if (value < 0)
{
if (cY > 0)
{
cY--;
}
cX = mText.Cols - 1;
}
else if(value >= mText.Cols)
{
DoLineFeed();
}
else
{
cX = value;
}
}
}
/// <summary>
/// The underlying Y cursor location field.
/// </summary>
protected int mY = 0;
/// <summary>
/// The underlying Cached Y cursor location field
/// </summary>
protected int cY = 0;
/// <summary>
/// Get and set cursor location on Y axis.
/// </summary>
public int Y
{
get => mY;
set
{
if (value < 0)
{
mY = 0;
}
else if (value >= mText.Rows)
{
cY = mText.Rows - 1;
DoLineFeed();
}
else
{
cY = value;
}
UpdateCursor();
}
}
public int CachedY
{
get => cY;
set
{
if (value < 0)
{
cY = 0;
}
else if (value >= mText.Rows)
{
cY = mText.Rows - 1;
DoLineFeed();
UpdateCursorFromCache();
}
else
{
cY = value;
}
}
}
/// <summary>
/// Get window width.
/// </summary>
public int Cols
{
get => mText.Cols;
set { }
}
/// <summary>
/// Get window height.
/// </summary>
public int Rows
{
set { }
get => mText.Rows;
}
/// <summary>
/// Text screen.
/// </summary>
public HAL.TextScreenBase mText;
/// <summary>
/// Constructs a new instance of the <see cref="Console"/> class.
/// </summary>
/// <param name="textScreen">The device to direct text output to.</param>
public Console(TextScreenBase textScreen)
{
if (textScreen == null)
{
mText = new TextScreen();
}
else
{
mText = textScreen;
}
}
/// <summary>
/// Clears the console, and changes the cursor location to (0, 0).
/// </summary>
public void Clear()
{
if (!IsStdOutRedirected())
{
mText.Clear();
cX = cY = mX = mY = 0;
UpdateCursor();
}
}
//TODO: This is slow, batch it and only do it at end of updates
/// <summary>
/// Update cursor position.
/// </summary>
protected void UpdateCursor()
{
cX = mX;
cY = mY;
mText.SetCursorPos(mX, mY);
}
public void UpdateCursorFromCache()
{
mX = cX;
mY = cY;
mText.SetCursorPos(mX, mY);
}
/// <summary>
/// Scrolls the console up and moves the cursor to the start of the line.
/// </summary>
private void DoLineFeed()
{
cY++;
cX = 0;
if (cY == mText.Rows)
{
mText.ScrollUp();
cY--;
}
}
/// <summary>
/// Moves the cursor to the start of the line.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DoCarriageReturn()
{
cX = 0;
}
/// <summary>
/// Print a tab character to the console.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void DoTab()
{
// Calculate the remainder when CachedX is divided by the NumberOfSpacesForTab
int remainder = cX % NumberOfSpacesForTab;
// if remainder is 0 then we will do a complete new tab, otherwise we will do what needs to be done to complete a tab
remainder = (remainder == 0) ? NumberOfSpacesForTab : (NumberOfSpacesForTab - remainder);
for (int i = 0; i < remainder; i++)
{
Write(Space);
}
}
/// <summary>
/// Write char to the console.
/// </summary>
/// <param name="aChar">A char to write</param>
public void Write(byte aChar)
{
Write(aChar, cX, cY);
}
/// <summary>
/// Write char to the console.
/// </summary>
/// <param name="aChar">A char to write.</param>
/// <param name="left">X axis position.</param>
/// <param name="top">Y axis position.</param>
public void Write(byte aChar, int left, int top)
{
mText[left, top] = aChar;
cX++;
if (cX == mText.Cols)
{
DoLineFeed();
}
}
//TODO: Optimize this
/// <summary>
/// Writes the given sequence of ASCII characters in the form of a byte
/// array to the console.
/// </summary>
/// <param name="aText">The byte array to write to the console.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Write(ReadOnlySpan<byte> aText)
{
if (aText == null)
{
return;
}
for (int i = 0; i < aText.Length; i++)
{
if (aText[i] == '\0')
{
// Skipping Null chars given by StreamWriter
continue;
}
switch (aText[i])
{
case LineFeed:
DoLineFeed();
break;
case CarriageReturn:
DoCarriageReturn();
break;
case Tab:
DoTab();
break;
/* Normal characters, simply write them */
default:
Write(aText[i]);
break;
}
}
}
/// <summary>
/// The foreground color of the displayed text.
/// </summary>
public ConsoleColor Foreground
{
get => (ConsoleColor)(mText.GetColor() ^ (byte)((byte)Background << 4));
set => mText.SetColors(value, Background);
}
/// <summary>
/// The background color of the displayed text.
/// </summary>
public ConsoleColor Background
{
get => (ConsoleColor)(mText.GetColor() >> 4);
set => mText.SetColors(Foreground, value);
}
/// <summary>
/// The size of the cursor, in the range of 1 to 100.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">Thrown when trying to set value out of range.</exception>
public int CursorSize
{
get => mText.GetCursorSize();
set
{
// Value should be a percentage from [1, 100].
if (value is < 1 or > 100)
{
throw new ArgumentOutOfRangeException(nameof(value), value, "The given CursorSize value " + value + " is out of range (1 - 100).");
}
mText.SetCursorSize(value);
}
}
public Stream OpenStandardInput()
{
return stdIn ??= new CosmosConsoleStream(FileAccess.Read);
}
public Stream OpenStandardOutput()
{
return stdOut ??= new CosmosConsoleStream(FileAccess.Write);
}
public Stream OpenStandardError()
{
return stdError ??= new CosmosConsoleStream(FileAccess.Write);
}
public static bool IsStdInRedirected()
{
return global::System.Console.In switch
{
null => false /* only used on create, if GetOrCreateReader is changed then this may be not needed */,
SyncTextReader sync => !sync.IsStdIn,
_ => true
};
}
public static bool IsStdOutRedirected()
{
return !(global::System.Console.Out is StreamWriter streamWriter
&& streamWriter.BaseStream is Console.CosmosConsoleStream);
}
public static bool IsStdErrorRedirected()
{
return !(global::System.Console.Error is StreamWriter streamWriter
&& streamWriter.BaseStream is Console.CosmosConsoleStream);
}
public TextReader GetOrCreateReader()
{
return StdInReader;
}
public TextWriter CreateOutputWriter(Stream outputStream) => outputStream == Stream.Null ?
TextWriter.Null :
(new StreamWriter(
stream: outputStream,
encoding: global::System.Console.OutputEncoding.RemovePreamble(),
bufferSize: WriteBufferSize,
leaveOpen: true)
{
AutoFlush = true
});
public ConsoleKeyInfo ReadKey(bool intercept)
{
if (global::System.Console.IsInputRedirected)
{
// The biggest lie i have seen in my life...
throw new InvalidOperationException("Can not read console keys as input is redirected.");
}
ConsoleKeyInfo keyInfo = StdInReader.ReadKey(out bool previouslyProcessed);
if (!intercept && !previouslyProcessed && keyInfo.KeyChar != '\0')
{
global::System.Console.Write(keyInfo.KeyChar);
}
return keyInfo;
}
public void ResetInternalStdIn()
{
_stdInReader = null;
}
internal SyncTextReader StdInReader => _stdInReader ??= SyncTextReader
.GetSynchronizedTextReader(new StdInReader(global::System.Console.InputEncoding));
/// <summary>
/// Get or sets the visibility of the cursor.
/// </summary>
public bool CursorVisible
{
get => mText.GetCursorVisible();
set => mText.SetCursorVisible(value);
}
}
internal static class EncodingExtensions
{
public static Encoding RemovePreamble(this Encoding encoding)
{
if (encoding.Preamble.Length == 0)
{
return encoding;
}
return new ConsoleEncoding(encoding);
}
}
}