lvti: goto declaration on var (IDEA-188739)

java/java-impl/src/com/intellij/codeInsight/navigation/actions/GotoVarTypeHandler.java

@@ -2,10 +2,8 @@
 package com.intellij.codeInsight.navigation.actions;
 
 import com.intellij.openapi.editor.Editor;
-import com.intellij.psi.PsiElement;
-import com.intellij.psi.PsiIdentifier;
-import com.intellij.psi.PsiTypeElement;
-import com.intellij.psi.PsiVariable;
+import com.intellij.psi.*;
+import com.intellij.psi.util.PsiUtil;
 import org.jetbrains.annotations.Nullable;
 
 public class GotoVarTypeHandler extends GotoDeclarationHandlerBase {
@@ -21,7 +19,12 @@ public class GotoVarTypeHandler extends GotoDeclarationHandlerBase {
         }
       }
     }
-
+    else if (elementAt instanceof PsiKeyword && PsiKeyword.VAR.equals(elementAt.getText())) {
+      PsiElement parent = elementAt.getParent();
+      if (parent instanceof PsiTypeElement && ((PsiTypeElement)parent).isInferredType()) {
+        return PsiUtil.resolveClassInClassTypeOnly(((PsiTypeElement)parent).getType());
+      }
+    }
     return null;
   }
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advLVTI/GotoDeclarationOnVar.java

@@ -0,0 +1,5 @@
+class WithVar {
+  {
+    v<caret>ar a = "";
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/LightAdvLVTIHighlightingTest.java

@@ -2,10 +2,14 @@
 package com.intellij.java.codeInsight.daemon;
 
 import com.intellij.codeInsight.daemon.LightDaemonAnalyzerTestCase;
+import com.intellij.codeInsight.navigation.actions.GotoDeclarationAction;
 import com.intellij.codeInspection.AnonymousCanBeLambdaInspection;
 import com.intellij.openapi.projectRoots.JavaSdkVersion;
 import com.intellij.openapi.projectRoots.Sdk;
 import com.intellij.pom.java.LanguageLevel;
+import com.intellij.psi.CommonClassNames;
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiElement;
 import com.intellij.testFramework.IdeaTestUtil;
 
 public class LightAdvLVTIHighlightingTest extends LightDaemonAnalyzerTestCase {
@@ -38,6 +42,17 @@ public class LightAdvLVTIHighlightingTest extends LightDaemonAnalyzerTestCase {
     doTest();
   }
 
+  public void testGotoDeclarationOnVar() {
+    configureByFile(BASE_PATH + "/" + getTestName(false) + ".java");
+    final int offset = getEditor().getCaretModel().getOffset();
+    final PsiElement[] elements =
+      GotoDeclarationAction.findAllTargetElements(getProject(), getEditor(), offset);
+    assertSize(1, elements);
+    PsiElement element = elements[0];
+    assertInstanceOf(element, PsiClass.class);
+    assertEquals(CommonClassNames.JAVA_LANG_STRING, ((PsiClass)element).getQualifiedName());
+  }
+
   @Override
   protected Sdk getProjectJDK() {
     return IdeaTestUtil.getMockJdk9();