ReFuel/Dashboard
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Implement command iterator.

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This commit is contained in:
H. Utku Maden 2024-12-14 20:44:27 +03:00
parent 1b6bf09f95
commit 1067d3e188
2 changed files with 147 additions and 6 deletions
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145
Dashboard.Drawing/DrawQueue.cs
View File

@ -1,11 +1,14 @@
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Drawing;
using System.IO;
using System.Runtime.CompilerServices;
namespace Dashboard.Drawing
{
public class DrawQueue : IDisposable
public class DrawQueue : IEnumerable<ICommandFrame>, IDisposable
{
private readonly HashList<IDrawExtension> _extensions = new HashList<IDrawExtension>();
private readonly HashList<IDrawCommand> _commands = new HashList<IDrawCommand>();
@ -118,6 +121,10 @@ namespace Dashboard.Drawing
}
}
public Enumerator GetEnumerator() => new Enumerator(this);
IEnumerator<ICommandFrame> IEnumerable<ICommandFrame>.GetEnumerator() => GetEnumerator();
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
private static int ToVlq(int value, Span<byte> bytes)
{
if (value < 0)
@ -125,8 +132,13 @@ namespace Dashboard.Drawing
else if (bytes.Length < 5)
throw new ArgumentOutOfRangeException(nameof(bytes), "Must at least be five bytes long.");
int i;
if (value == 0)
{
bytes[0] = 0;
return 1;
}
int i;
for (i = 0; i < 5 && value != 0; i++, value >>= 7)
{
if (i > 0)
@ -138,21 +150,25 @@ namespace Dashboard.Drawing
return i;
}
private static int FromVlq(ReadOnlySpan<byte> bytes)
private static int FromVlq(ReadOnlySpan<byte> bytes, out int value)
{
int value = 0;
value = 0;
for (int i = 0; i < bytes.Length; i++)
int i;
for (i = 0; i < bytes.Length; i++)
{
byte b = bytes[i];
value = (value << 7) | b;
if ((b & (1 << 7)) == 0)
{
i++;
break;
}
}
return value;
return i;
}
public void Dispose()
@ -195,8 +211,125 @@ namespace Dashboard.Drawing
Write(command, bytes);
}
}
public class Enumerator : ICommandFrame, IEnumerator<ICommandFrame>
{
private readonly DrawQueue _queue;
private readonly byte[] _stream;
private int _length;
private int _index = -1;
private int _paramsIndex = -1;
private int _paramLength = 0;
private IDrawCommand? _current = null;
public ICommandFrame Current => this;
object? IEnumerator.Current => Current;
public IDrawCommand Command => _current ?? throw new InvalidOperationException();
public bool HasParameters { get; private set; }
public Enumerator(DrawQueue queue)
{
_queue = queue;
_stream = queue._commandStream.GetBuffer();
_length = (int)queue._commandStream.Length;
}
public bool MoveNext()
{
if (_index >= _length)
return false;
if (_index == -1)
_index = 0;
_index += FromVlq(_stream[_index .. (_index + 5)], out int command);
_current = _queue.Command[command];
HasParameters = _current.Length != 0;
if (!HasParameters)
{
_paramsIndex = -1;
return true;
}
int length;
if (_current.Length < 0)
{
_index += FromVlq(_stream[_index .. (_index + 5)], out length);
}
else
{
length = _current.Length;
}
_paramsIndex = _index;
_paramLength = length;
_index += length;
return true;
}
public void Reset()
{
_index = -1;
_current = null;
}
public object? GetParameter()
{
return _current?.GetParams(_queue, _stream.AsSpan(_paramsIndex, _paramLength));
}
public T GetParameter<T>()
{
if (_current is IDrawCommand<T> command)
{
return command.GetParams(_queue, _stream.AsSpan(_paramsIndex, _paramLength))!;
}
else
{
throw new InvalidOperationException();
}
}
public bool TryGetParameter<T>([NotNullWhen(true)] out T? parameter)
{
if (_current is IDrawCommand<T> command)
{
parameter = command.GetParams(_queue, _stream.AsSpan(_paramsIndex, _paramLength))!;
return true;
}
else
{
parameter = default;
return false;
}
}
public void Dispose()
{
}
}
}
public interface ICommandFrame
{
public IDrawCommand Command { get; }
public bool HasParameters { get; }
public object? GetParameter();
public T GetParameter<T>();
public bool TryGetParameter<T>([NotNullWhen(true)] out T? parameter);
}
public interface IDrawController
{
/// <summary>

8
tests/Dashboard.TestApplication/Program.cs
View File

@ -12,4 +12,12 @@ queue.Point(Vector3.Zero, 2f, fg);
queue.Line(Vector3.Zero, Vector3.One * 2, 2f, bg);
queue.Rect(Vector3.UnitX, 2 * Vector3.UnitX + Vector3.UnitY, fg, bg, 2f);
foreach (ICommandFrame frame in queue)
{
Console.WriteLine("{0}", frame.Command.Name);
if (frame.HasParameters)
Console.WriteLine("Param: {0}", frame.GetParameter());
}
Debugger.Break();