1 files changed, 52 insertions, 0 deletions

diff --git a/subprojects/language/src/main/java/tools/refinery/language/scoping/ShadowingKeyAwareSelectableBasedScope.java b/subprojects/language/src/main/java/tools/refinery/language/scoping/ShadowingKeyAwareSelectableBasedScope.java
new file mode 100644
index 00000000..cdef13ad
--- /dev/null
+++ b/subprojects/language/src/main/java/tools/refinery/language/scoping/ShadowingKeyAwareSelectableBasedScope.java
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.language.scoping;
+
+import com.google.common.base.Predicate;
+import org.eclipse.emf.ecore.EClass;
+import org.eclipse.xtext.resource.IEObjectDescription;
+import org.eclipse.xtext.resource.ISelectable;
+import org.eclipse.xtext.scoping.IScope;
+import org.eclipse.xtext.scoping.impl.SelectableBasedScope;
+import tools.refinery.language.resource.ProblemResourceDescriptionStrategy;
+
+import java.util.Objects;
+
+public class ShadowingKeyAwareSelectableBasedScope extends SelectableBasedScope {
+        public static IScope createScope(IScope outer, ISelectable selectable, EClass type, boolean ignoreCase) {
+                return createScope(outer, selectable, null, type, ignoreCase);
+        }
+
+        // {@link com.google.common.base.Predicate} required by Xtext API.
+        @SuppressWarnings("squid:S4738")
+        public static IScope createScope(IScope outer, ISelectable selectable, Predicate<IEObjectDescription> filter,
+                                                                         EClass type, boolean ignoreCase) {
+                if (selectable == null || selectable.isEmpty())
+                        return outer;
+                return new ShadowingKeyAwareSelectableBasedScope(outer, selectable, filter, type, ignoreCase);
+        }
+
+        // {@link com.google.common.base.Predicate} required by Xtext API.
+        @SuppressWarnings("squid:S4738")
+        protected ShadowingKeyAwareSelectableBasedScope(IScope outer, ISelectable selectable,
+                                                                                                        Predicate<IEObjectDescription> filter,
+                                                                                                        EClass type, boolean ignoreCase) {
+                super(outer, selectable, filter, type, ignoreCase);
+        }
+
+        @Override
+        protected boolean isShadowed(IEObjectDescription input) {
+                var shadowingKey = input.getUserData(ProblemResourceDescriptionStrategy.SHADOWING_KEY);
+                var localElements = getLocalElementsByName(input.getName());
+                for (var localElement : localElements) {
+                        var localElementKey = localElement.getUserData(ProblemResourceDescriptionStrategy.SHADOWING_KEY);
+                        if (Objects.equals(shadowingKey, localElementKey)) {
+                                return true;
+                        }
+                }
+                return false;
+        }
+}