Convert Regions/Spawns to JSON (#138)

Projects/Server/JsonConfiguration/Converters/Point2DConverter.cs

@@ -0,0 +1,105 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright (C) 2019-2020 - ModernUO Development Team                   *
+ * Email: hi@modernuo.com                                                *
+ * File: Point2DConverter.cs                                             *
+ * Created: 2020/04/12 - Updated: 2020/05/23                             *
+ *                                                                       *
+ * This program is free software: you can redistribute it and/or modify  *
+ * it under the terms of the GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3 of the License, or     *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * This program is distributed in the hope that it will be useful,       *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ * GNU General Public License for more details.                          *
+ *                                                                       *
+ * You should have received a copy of the GNU General Public License     *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Server.Json
+{
+  public class Point2DConverter : JsonConverter<Point2D>
+  {
+    private Point2D DeserializeArray(ref Utf8JsonReader reader)
+    {
+      Span<int> data = stackalloc int[2];
+      var count = 0;
+
+      while (true)
+      {
+        reader.Read();
+        if (reader.TokenType == JsonTokenType.EndArray)
+          break;
+
+        if (reader.TokenType == JsonTokenType.Number)
+        {
+          if (count < 2)
+            data[count] = reader.GetInt32();
+
+          count++;
+        }
+      }
+
+      if (count > 2)
+        throw new JsonException("Point2D must be an array of x, y");
+
+      return new Point2D(data[0], data[1]);
+    }
+
+    private Point2D DeserializeObj(ref Utf8JsonReader reader)
+    {
+      Span<int> data = stackalloc int[2];
+
+      while (true)
+      {
+        reader.Read();
+        if (reader.TokenType == JsonTokenType.EndObject)
+          break;
+
+        if (reader.TokenType != JsonTokenType.PropertyName)
+          throw new JsonException("Invalid Json structure for Point2D object");
+
+        var key = reader.GetString();
+
+        var i = key switch
+        {
+          "x" => 0,
+          "y" => 1,
+          _ => throw new JsonException($"Invalid property {key} for Point2D")
+        };
+
+        reader.Read();
+
+        if (reader.TokenType != JsonTokenType.Number)
+          throw new JsonException($"Value for {key} must be a number");
+
+        data[i] = reader.GetInt32();
+      }
+
+      return new Point2D(data[0], data[1]);
+    }
+
+    public override Point2D Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) =>
+      reader.TokenType switch
+      {
+        JsonTokenType.StartArray => DeserializeArray(ref reader),
+        JsonTokenType.StartObject => DeserializeObj(ref reader),
+        _ => throw new JsonException("Invalid Json for Point3D")
+      };
+
+    public override void Write(Utf8JsonWriter writer, Point2D value, JsonSerializerOptions options)
+    {
+      writer.WriteStartArray();
+      writer.WriteNumberValue(value.X);
+      writer.WriteNumberValue(value.Y);
+      writer.WriteEndArray();
+    }
+  }
+}