constant returnable helper method

common/addons/api-terrascript/src/main/java/com/dfsek/terra/addons/terrascript/api/lang/Returnable.java

@@ -1,5 +1,10 @@
 package com.dfsek.terra.addons.terrascript.api.lang;
 
+import com.dfsek.terra.addons.terrascript.api.ImplementationArguments;
+import com.dfsek.terra.addons.terrascript.api.Position;
+
+import java.util.Map;
+
 public interface Returnable<T> extends Item<T> {
     ReturnType returnType();
 
@@ -16,4 +21,23 @@ public interface Returnable<T> extends Item<T> {
             return comparable;
         }
     }
+
+    static <T> Returnable<T> constant(T value, ReturnType type, Position position) {
+        return new Returnable<T>() {
+            @Override
+            public ReturnType returnType() {
+                return type;
+            }
+
+            @Override
+            public T apply(ImplementationArguments implementationArguments, Map<String, Variable<?>> variableMap) {
+                return value;
+            }
+
+            @Override
+            public Position getPosition() {
+                return position;
+            }
+        };
+    }
 }