Add chart compatibility handler.

Assets/Cryville/Crtr/Chart.cs

@@ -242,6 +242,7 @@ namespace Cryville.Crtr {
 		}
 	}
 
+	[JsonConverter(typeof(ChartCompatibilityHandler))]
 	public class Chart : EventContainer {
 		[JsonRequired]
 		public long format; // Format Version
@@ -308,40 +309,7 @@ namespace Cryville.Crtr {
 			private void LoadFromString(string s) {
 				if (Node != null)
 					throw new InvalidOperationException("The motion property can only be set at initialization");
-				Match m = Regex.Match(s, @"^([0-9A-Za-z_]+)(#(\d+))?(.+)?$");
-				if (!m.Success) throw new ArgumentException("Invalid motion string format");
-				name = new Identifier(m.Groups[1].Value);
-				var registry = ChartPlayer.motionRegistry[name];
-				Node = new MotionNode();
-				if (m.Groups[3].Success) {
-					short id = short.Parse(m.Groups[3].Value);
-					if (id < 0) throw new ArgumentException("Got negative motion node index");
-					Node.Id = id;
-				}
-				if (m.Groups[4].Success) {
-					_itor.SetSource(m.Groups[4].Value);
-					while (_itor.Position < _itor.Source.Length) {
-						var c = _itor.GetChar();
-						var exp = _itor.GetExp();
-						switch (c) {
-							case '@':
-								ChartPlayer.etor.Evaluate(_vecop, exp);
-								Node.Time = new Vec1(_vecbuf);
-								break;
-							case '~':
-								ChartPlayer.etor.Evaluate(_vecop, exp);
-								Node.EndTime = new Vec1(_vecbuf);
-								break;
-							case ':':
-								ChartPlayer.etor.Evaluate(_vecop, exp);
-								Node.Value = Vector.Construct(ChartPlayer.motionRegistry[Name].Type, _vecbuf);
-								break;
-							default:
-								throw new ArgumentException("Invalid motion string format");
-						}
-					}
-				}
-				else Node.Reset = true;
+				ChartCompatibilityHandler.MotionStringParser.Parse(s, out name, out Node);
 				SubmitPropSrc("value", new VectorSrc(() => Node.Value));
 			}