Add AbstractGameRule.cs & derived classes

PckStudio.Core/GameRule/DistributeItems.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using OMI.Formats.GameRule;
+
+namespace PckStudio.Core.GameRule
+{
+    internal sealed class DistributeItems : AbstractGameRule
+    {
+        private static string[] _strings =
+        {
+            "StartItems",
+            "OuterItems",
+            "HVItems"
+        };
+
+        internal enum DistributeItemsId
+        {
+            StartItems,
+            OuterItems,
+            HighValueItems
+        }
+        private DistributeItemsId _id;
+
+        internal void AddPosition(int x, int y, int z) => AddRule(new WorldPosition(x, y, z));
+
+        public DistributeItems(DistributeItemsId id)
+        {
+            _id = id;
+        }
+
+        protected override GameRuleFile.GameRule GetGameRule()
+        {
+            var gameRule = new GameRuleFile.GameRule("DistributeItems");
+            gameRule.AddParameter(new GameRuleFile.GameRuleParameter("id", _strings[(int)_id]));
+            return gameRule;
+        }
+    }
+}