fix exit point highlighting

plugins/groovy/src/org/jetbrains/plugins/groovy/findUsages/GrHighlightExitPointHandler.java

@@ -67,11 +67,16 @@ public class GrHighlightExitPointHandler extends HighlightUsagesHandlerBase<PsiE
       @Override
       public boolean visitExitPoint(Instruction instruction, @Nullable GrExpression returnValue) {
         final PsiElement returnElement = instruction.getElement();
-        if (returnElement == null) return true;
-        final TextRange range = returnElement.getTextRange();
-        myReadUsages.add(range);
+        if (returnElement != null && isCorrectReturn(returnElement)) {
+          final TextRange range = returnElement.getTextRange();
+          myReadUsages.add(range);
+        }
         return true;
       }
     });
   }
+
+  private static boolean isCorrectReturn(@Nullable PsiElement e) {
+    return e instanceof GrReturnStatement || e instanceof GrThrowStatement || e instanceof GrExpression;
+  }
 }

plugins/groovy/test/org/jetbrains/plugins/groovy/lang/highlighting/GrReturnPointHighlightingTest.groovy

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.plugins.groovy.lang.highlighting
+
+import com.intellij.codeInsight.highlighting.HighlightUsagesHandler
+import com.intellij.codeInsight.highlighting.HighlightUsagesHandlerBase
+import com.intellij.openapi.util.TextRange
+import com.intellij.psi.PsiElement
+import org.jetbrains.plugins.groovy.LightGroovyTestCase
+
+/**
+ * @author Max Medvedev
+ */
+class GrReturnPointHighlightingTest extends LightGroovyTestCase {
+  final String basePath = null
+
+  void testReturnPoint1() {
+    doTest('''\
+private static getWorldType(stepFile) {
+    final worldType //unused
+    if (som) throw new IOException()
+
+    for (statement in stepFile.statements) {
+        if (statement instanceof String && isWorldDeclaration(statement)) {
+            final closure = getClosureArg(statement)
+            re<caret>turn closure.returnType
+        }
+    }
+}
+''', 'throw new IOException()', 'return closure.returnType')
+  }
+
+  void testReturnPoint2() {
+    doTest('''\
+private static getWorldType(stepFile) {
+    final worldType //unused
+    if (som) throw new IOException()
+
+    for (statement in stepFile.statements) {
+        if (statement instanceof String && isWorldDeclaration(statement)) {
+            final closure = getClosureArg(statement)
+            re<caret>turn closure.returnType
+        }
+    }
+    2
+}
+''', 'throw new IOException()', 'return closure.returnType', '2')
+  }
+
+  private void doTest(final String text, final String... usages) {
+    myFixture.configureByText('_.groovy', text)
+    HighlightUsagesHandlerBase<PsiElement> handler = HighlightUsagesHandler.createCustomHandler(myFixture.editor, myFixture.file);
+    assertNotNull(handler);
+    List<PsiElement> targets = handler.targets;
+    assertEquals(1, targets.size());
+    assertEquals("return", targets.get(0).getText());
+
+    handler.computeUsages(targets);
+    List<TextRange> readUsages = handler.readUsages;
+    assertEquals(usages.length, readUsages.size());
+
+    final List<String> textUsages = readUsages.collect { fileTextOfRange(it) }
+    assertSameElements(Arrays.asList(usages), textUsages)
+  }
+
+  protected String fileTextOfRange(TextRange textRange) {
+    return myFixture.file.text.substring(textRange.startOffset, textRange.endOffset);
+  }
+}