refactor Item to api addon

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

@@ -0,0 +1,7 @@
+package com.dfsek.terra.addons.terrascript.api;
+
+/**
+ * Arguments passed to {@link Item}s by the implementation
+ */
+public interface ImplementationArguments {
+}

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

@@ -0,0 +1,9 @@
+package com.dfsek.terra.addons.terrascript.api;
+
+import java.util.Map;
+
+public interface Item<T> {
+    T apply(ImplementationArguments implementationArguments, Map<String, Variable<?>> variableMap);
+
+    Position getPosition();
+}

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

@@ -0,0 +1,16 @@
+package com.dfsek.terra.addons.terrascript.api;
+
+public class Position {
+    private final int line;
+    private final int index;
+
+    public Position(int line, int index) {
+        this.line = line;
+        this.index = index;
+    }
+
+    @Override
+    public String toString() {
+        return (line + 1) + ":" + index;
+    }
+}

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

@@ -0,0 +1,19 @@
+package com.dfsek.terra.addons.terrascript.api;
+
+public interface Returnable<T> extends Item<T> {
+    ReturnType returnType();
+
+    enum ReturnType {
+        NUMBER(true), STRING(true), BOOLEAN(false), VOID(false), OBJECT(false);
+
+        private final boolean comparable;
+
+        ReturnType(boolean comparable) {
+            this.comparable = comparable;
+        }
+
+        public boolean isComparable() {
+            return comparable;
+        }
+    }
+}

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

@@ -0,0 +1,11 @@
+package com.dfsek.terra.addons.terrascript.api;
+
+public interface Variable<T> {
+    T getValue();
+
+    void setValue(T value);
+
+    Returnable.ReturnType getType();
+
+    Position getPosition();
+}