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move backend to subfolder

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This commit is contained in:
Vinzenz Schroeter 2024-04-21 12:38:03 +02:00
commit 8d09663eff
1 changed files with 97 additions and 87 deletions
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71
DisplayCommands/Cp437Grid.cs
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@ -1,71 +0,0 @@
using System.Diagnostics;
using System.Text;
namespace DisplayCommands;
public sealed class Cp437Grid(ushort width, ushort height) : IEquatable<Cp437Grid>
{
private readonly ByteGrid _byteGrid = new(width, height);
private readonly Encoding _encoding = Encoding.GetEncoding(437);
public ushort Height { get; } = height;
public ushort Width { get; } = width;
internal Memory<byte> Data => _byteGrid.Data;
public char this[ushort x, ushort y]
{
get => ByteToChar(_byteGrid[x, y]);
set => _byteGrid[x, y] = CharToByte(value);
}
public string this[ushort row]
{
get
{
var rowStart = row * Width;
return _encoding.GetString(_byteGrid.Data[rowStart..(rowStart + Width)].Span);
}
set
{
ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual(row, Height, nameof(row));
ArgumentOutOfRangeException.ThrowIfGreaterThan(value.Length, Width, nameof(value));
ushort x = 0;
for (; x < value.Length; x++)
_byteGrid[x, row] = CharToByte(value[x]);
for (; x < Width; x++)
_byteGrid[x, row] = CharToByte(' ');
}
}
private byte CharToByte(char c)
{
ReadOnlySpan<char> valuesStr = stackalloc char[] { c };
Span<byte> convertedStr = stackalloc byte[1];
var consumed = _encoding.GetBytes(valuesStr, convertedStr);
Debug.Assert(consumed == 1);
return convertedStr[0];
}
private char ByteToChar(byte b)
{
ReadOnlySpan<byte> valueBytes = stackalloc byte[] { b };
Span<char> resultStr = stackalloc char[1];
var consumed = _encoding.GetChars(valueBytes, resultStr);
Debug.Assert(consumed == 1);
return resultStr[0];
}
public bool Equals(Cp437Grid? other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return Height == other.Height && Width == other.Width && _byteGrid.Equals(other._byteGrid);
}
public override bool Equals(object? obj) => ReferenceEquals(this, obj) || (obj is Cp437Grid other && Equals(other));
public override int GetHashCode() => HashCode.Combine(_byteGrid, Height, Width);
public static bool operator ==(Cp437Grid? left, Cp437Grid? right) => Equals(left, right);
public static bool operator !=(Cp437Grid? left, Cp437Grid? right) => !Equals(left, right);
}