refactor access to context data

src/main/java/carpet/script/CarpetContext.java

@@ -3,11 +3,16 @@ package carpet.script;
 import carpet.script.value.Value;
 import net.minecraft.commands.CommandSourceStack;
 import net.minecraft.core.BlockPos;
+import net.minecraft.core.Registry;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
 
 public class CarpetContext extends Context
 {
-    public CommandSourceStack s;
-    public final BlockPos origin;
+    private CommandSourceStack s;
+    private final BlockPos origin;
 
     public CarpetContext(CarpetScriptHost host, CommandSourceStack source) {
         this(host, source, BlockPos.ZERO);
@@ -34,4 +39,38 @@ public class CarpetContext extends Context
         variables.put("_y", (c, t) -> Value.ZERO);
         variables.put("_z", (c, t) -> Value.ZERO);
     }
+
+    public MinecraftServer server()
+    {
+        return s.getServer();
+    }
+
+    public ServerLevel level()
+    {
+        return s.getLevel();
+    }
+
+    public RegistryAccess registryAccess()
+    {
+        return s.getLevel().registryAccess();
+    }
+
+    public <T> Registry<T> registry(ResourceKey<? extends Registry<? extends T>> resourceKey) {
+        return registryAccess().registryOrThrow(resourceKey);
+    }
+
+    public CommandSourceStack source()
+    {
+        return s;
+    }
+
+    public BlockPos origin()
+    {
+        return origin;
+    }
+
+    public void swapSource(CommandSourceStack source)
+    {
+        s = source;
+    }
 }