1 files changed, 22 insertions, 0 deletions
diff --git a/rba.tool.editor/src/rba/tool/editor/scoping/IExpressionScope.xtend b/rba.tool.editor/src/rba/tool/editor/scoping/IExpressionScope.xtend
new file mode 100644
index 0000000..12f7ca4
--- /dev/null
+++ b/rba.tool.editor/src/rba/tool/editor/scoping/IExpressionScope.xtend
@@ -0,0 +1,22 @@
+package rba.tool.editor.scoping
+
+import org.eclipse.emf.ecore.EObject
+import org.eclipse.xtext.scoping.IScope
+
+interface IExpressionScope {
+
+	enum Anchor {
+		UNKNOWN,
+		CONSTRAINT
+	}
+
+	def IScope getFeatureScope(EObject model, IExpressionScope.Anchor anchor);
+
+	IExpressionScope NULL = new NullExpressionScope();
+
+	class NullExpressionScope implements IExpressionScope {
+		override getFeatureScope(EObject model, IExpressionScope.Anchor anchor) {
+			return IScope.NULLSCOPE;
+		}
+	}
+}