speckle-sharp-sdk/src/Speckle.Objects/EncodingOptimisations.cs

using Speckle.Objects.Geometry;

namespace Speckle.Objects;

public static class CurveTypeEncoding
{
  public const double Arc = 0;
  public const double Circle = 1;
  public const double Curve = 2;
  public const double Ellipse = 3;
  public const double Line = 4;
  public const double Polyline = 5;
  public const double PolyCurve = 6;
}

/// <summary>
/// This class is a helper class for Brep curve encoding!!
/// </summary>
public static class CurveArrayEncodingExtensions
{
  public static List<double> ToArray(IReadOnlyCollection<ICurve> curves)
  {
    var list = new List<double>();
    foreach (var curve in curves)
    {
      switch (curve)
      {
        case Arc a:
          list.AddRange(a.ToList());
          break;
        case Circle c:
          list.AddRange(c.ToList());
          break;
        case Curve c:
          list.AddRange(c.ToList());
          break;
        case Ellipse e:
          list.AddRange(e.ToList());
          break;
        case Line l:
          list.AddRange(l.ToList());
          break;
        case Polycurve p:
          list.AddRange(p.ToList());
          break;
        case Polyline p:
          list.AddRange(p.ToList());
          break;
        default:
          throw new ArgumentOutOfRangeException(nameof(curves), $"Unkown curve type: {curve.GetType()}.");
      }
    }

    return list;
  }

  public static List<ICurve> FromArray(List<double> list)
  {
    var curves = new List<ICurve>();
    if (list.Count == 0)
    {
      return curves;
    }

    var done = false;
    var currentIndex = 0;

    while (!done)
    {
      var itemLength = (int)list[currentIndex];
      var item = list.GetRange(currentIndex, itemLength + 1);

      switch (item[1])
      {
        case CurveTypeEncoding.Arc:
          curves.Add(Arc.FromList(item));
          break;
        case CurveTypeEncoding.Circle:
          curves.Add(Circle.FromList(item));
          break;
        case CurveTypeEncoding.Curve:
          curves.Add(Curve.FromList(item));
          break;
        case CurveTypeEncoding.Ellipse:
          curves.Add(Ellipse.FromList(item));
          break;
        case CurveTypeEncoding.Line:
          curves.Add(Line.FromList(item));
          break;
        case CurveTypeEncoding.Polyline:
          curves.Add(Polyline.FromList(item));
          break;
        case CurveTypeEncoding.PolyCurve:
          curves.Add(Polycurve.FromList(item));
          break;
      }

      currentIndex += itemLength + 1;
      done = currentIndex >= list.Count;
    }
    return curves;
  }
}