1 files changed, 151 insertions, 0 deletions

diff --git a/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java b/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java
new file mode 100644
index 00000000..b2e3c90b
--- /dev/null
+++ b/language-ide/src/main/java/tools/refinery/language/ide/syntaxcoloring/ProblemSemanticHighlightingCalculator.java
@@ -0,0 +1,151 @@
+package tools.refinery.language.ide.syntaxcoloring;
+
+import java.util.List;
+
+import org.eclipse.emf.common.util.EList;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.xtext.ide.editor.syntaxcoloring.DefaultSemanticHighlightingCalculator;
+import org.eclipse.xtext.ide.editor.syntaxcoloring.IHighlightedPositionAcceptor;
+import org.eclipse.xtext.nodemodel.INode;
+import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
+import org.eclipse.xtext.service.OperationCanceledManager;
+import org.eclipse.xtext.util.CancelIndicator;
+
+import com.google.common.collect.ImmutableList;
+import com.google.inject.Inject;
+
+import tools.refinery.language.ProblemUtil;
+import tools.refinery.language.model.problem.ClassDeclaration;
+import tools.refinery.language.model.problem.EnumDeclaration;
+import tools.refinery.language.model.problem.NamedElement;
+import tools.refinery.language.model.problem.Node;
+import tools.refinery.language.model.problem.Parameter;
+import tools.refinery.language.model.problem.PredicateDefinition;
+import tools.refinery.language.model.problem.ProblemPackage;
+import tools.refinery.language.model.problem.ReferenceDeclaration;
+import tools.refinery.language.model.problem.Variable;
+
+public class ProblemSemanticHighlightingCalculator extends DefaultSemanticHighlightingCalculator {
+        private static final String BUILTIN_CLASS = "cm-keyword";
+        private static final String CLASS_CLASS = "problem-class";
+        private static final String ABSTRACT_CLASS = "problem-abstract";
+        private static final String ENUM_CLASS = "problem-enum";
+        private static final String REFERENCE_CLASS = "problem-reference";
+        private static final String CONTAINMENT_CLASS = "problem-containment";
+        private static final String PREDICATE_CLASS = "problem-predicate";
+        private static final String ERROR_CLASS = "problem-error";
+        private static final String NODE_CLASS = "problem-node";
+        private static final String UNIQUE_NODE_CLASS = "problem-unique-node";
+        private static final String NEW_NODE_CLASS = "problem-new-node";
+        private static final String PARAMETER_CLASS = "problem-parameter";
+        private static final String VARIABLE_CLASS = "problem-variable";
+        private static final String SINGLETON_VARIABLE_CLASS = "problem-singleton-variable";
+
+        @Inject
+        private OperationCanceledManager operationCanceledManager;
+
+        @Override
+        protected boolean highlightElement(EObject object, IHighlightedPositionAcceptor acceptor,
+                        CancelIndicator cancelIndicator) {
+                highlightName(object, acceptor);
+                highlightCrossReferences(object, acceptor, cancelIndicator);
+                return false;
+        }
+
+        protected void highlightName(EObject object, IHighlightedPositionAcceptor acceptor) {
+                if (!(object instanceof NamedElement)) {
+                        return;
+                }
+                String[] highlightClass = getHighlightClass(object);
+                if (highlightClass.length > 0) {
+                        highlightFeature(acceptor, object, ProblemPackage.Literals.NAMED_ELEMENT__NAME, highlightClass);
+                }
+        }
+
+        protected void highlightCrossReferences(EObject object, IHighlightedPositionAcceptor acceptor,
+                        CancelIndicator cancelIndicator) {
+                for (EReference reference : object.eClass().getEAllReferences()) {
+                        if (reference.isContainment()) {
+                                continue;
+                        }
+                        operationCanceledManager.checkCanceled(cancelIndicator);
+                        if (reference.isMany()) {
+                                highlightManyValues(object, reference, acceptor);
+                        } else {
+                                highlightSingleValue(object, reference, acceptor);
+                        }
+                }
+        }
+
+        protected void highlightSingleValue(EObject object, EReference reference, IHighlightedPositionAcceptor acceptor) {
+                EObject valueObj = (EObject) object.eGet(reference);
+                String[] highlightClass = getHighlightClass(valueObj);
+                if (highlightClass.length > 0) {
+                        highlightFeature(acceptor, object, reference, highlightClass);
+                }
+        }
+
+        protected void highlightManyValues(EObject object, EReference reference, IHighlightedPositionAcceptor acceptor) {
+                @SuppressWarnings("unchecked")
+                EList<? extends EObject> values = (EList<? extends EObject>) object.eGet(reference);
+                List<INode> nodes = NodeModelUtils.findNodesForFeature(object, reference);
+                int size = Math.min(values.size(), nodes.size());
+                for (var i = 0; i < size; i++) {
+                        EObject valueInList = values.get(i);
+                        INode node = nodes.get(i);
+                        String[] highlightClass = getHighlightClass(valueInList);
+                        if (highlightClass.length > 0) {
+                                highlightNode(acceptor, node, highlightClass);
+                        }
+                }
+        }
+
+        protected String[] getHighlightClass(EObject eObject) {
+                if (ProblemUtil.isBuiltIn(eObject)) {
+                        return new String[] { BUILTIN_CLASS };
+                }
+                ImmutableList.Builder<String> classesBuilder = ImmutableList.builder();
+                if (eObject instanceof ClassDeclaration classDeclaration) {
+                        classesBuilder.add(CLASS_CLASS);
+                        if (classDeclaration.isAbstract()) {
+                                classesBuilder.add(ABSTRACT_CLASS);
+                        }
+                }
+                if (eObject instanceof EnumDeclaration) {
+                        classesBuilder.add(ENUM_CLASS);
+                }
+                if (eObject instanceof ReferenceDeclaration referenceDeclaration) {
+                        classesBuilder.add(REFERENCE_CLASS);
+                        if (referenceDeclaration.isContainment()) {
+                                classesBuilder.add(CONTAINMENT_CLASS);
+                        }
+                }
+                if (eObject instanceof PredicateDefinition predicateDefinition) {
+                        classesBuilder.add(PREDICATE_CLASS);
+                        if (predicateDefinition.isError()) {
+                                classesBuilder.add(ERROR_CLASS);
+                        }
+                }
+                if (eObject instanceof Node node) {
+                        classesBuilder.add(NODE_CLASS);
+                        if (ProblemUtil.isUniqueNode(node)) {
+                                classesBuilder.add(UNIQUE_NODE_CLASS);
+                        }
+                        if (ProblemUtil.isNewNode(node)) {
+                                classesBuilder.add(NEW_NODE_CLASS);
+                        }
+                }
+                if (eObject instanceof Parameter) {
+                        classesBuilder.add(PARAMETER_CLASS);
+                }
+                if (eObject instanceof Variable variable) {
+                        classesBuilder.add(VARIABLE_CLASS);
+                        if (ProblemUtil.isSingletonVariable(variable)) {
+                                classesBuilder.add(SINGLETON_VARIABLE_CLASS);
+                        }
+                }
+                List<String> classes = classesBuilder.build();
+                return classes.toArray(new String[0]);
+        }
+}