switch expression precedence

java/java-psi-api/src/com/intellij/psi/util/PsiPrecedenceUtil.java

@@ -128,7 +128,7 @@ public class PsiPrecedenceUtil {
     if (expression instanceof PsiPrefixExpression) {
       return PREFIX_PRECEDENCE;
     }
-    if (expression instanceof PsiPostfixExpression) {
+    if (expression instanceof PsiPostfixExpression || expression instanceof PsiSwitchExpression) {
       return POSTFIX_PRECEDENCE;
     }
     if (expression instanceof PsiPolyadicExpression) {

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/ReplaceExpressionUtil.java

@@ -1,18 +1,4 @@
-/*
- * 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.
- */
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.psi.impl.source.tree.java;
 
 import com.intellij.lang.ASTNode;
@@ -143,7 +129,7 @@ public class ReplaceExpressionUtil {
     else if (i == JavaElementType.PREFIX_EXPRESSION || i == JavaElementType.TYPE_CAST_EXPRESSION) {
       return 12;
     }
-    else if (i == JavaElementType.POSTFIX_EXPRESSION) {
+    else if (i == JavaElementType.POSTFIX_EXPRESSION || i == JavaElementType.SWITCH_EXPRESSION) {
       return 13;
     }
     else if (i == JavaElementType.LITERAL_EXPRESSION ||

plugins/InspectionGadgets/test/com/siyeh/igfixes/parentheses/SwitchExpression.after.java

@@ -0,0 +1,8 @@
+class SwitchExpression {
+
+  void it() {
+    long z = (long) switch(1) {
+      default -> 10;
+    } + 1;
+  }
+}

plugins/InspectionGadgets/test/com/siyeh/igfixes/parentheses/SwitchExpression.java

@@ -0,0 +1,8 @@
+class SwitchExpression {
+
+  void it() {
+    long z = (long) (<caret>switch(1) {
+      default -> 10;
+    }) + 1;
+  }
+}

plugins/InspectionGadgets/test/com/siyeh/igtest/style/unnecessary_parentheses/UnnecessaryParenthesesInspection.java

@@ -6,6 +6,16 @@ import java.util.ArrayList;
 public class UnnecessaryParenthesesInspection
 {
 
+    void switchExpressions() {
+      String s = (switch(1) {
+        case 1 -> "one";
+        default -> "other";
+      }).substring(1);
+      int z = -<warning descr="Parentheses around '(switch(1) { default -> 10; })' are unnecessary">(switch(1) {
+        default -> 10;
+      })</warning> + 10;
+    }
+
     public int foo()
     {
         final String s = "foo" + (3 + 4); // do not warn here

plugins/InspectionGadgets/testsrc/com/siyeh/ig/fixes/parenthesis/UnnecessaryParenthesesQuickFixTest.java

@@ -1,18 +1,4 @@
-/*
- * Copyright 2000-2016 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.
- */
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.siyeh.ig.fixes.parenthesis;
 
 import com.siyeh.InspectionGadgetsBundle;
@@ -47,6 +33,8 @@ public class UnnecessaryParenthesesQuickFixTest extends IGQuickFixesTestCase {
   public void testLambdaCast() { doTest(); }
   public void testLambdaBody() { doTest(); }
   public void testDivision() { doTest(); }
+  public void testSwitchExpression() { doTest(); }
+
   @Override
   protected BaseInspection getInspection() {
     return new UnnecessaryParenthesesInspection();

plugins/InspectionGadgets/testsrc/com/siyeh/ig/style/UnnecessaryParenthesesInspectionTest.java

@@ -18,7 +18,7 @@ public class UnnecessaryParenthesesInspectionTest extends LightCodeInsightFixtur
   @NotNull
   @Override
   protected LightProjectDescriptor getProjectDescriptor() {
-    return JAVA_8;
+    return JAVA_12;
   }
 
   public void testUnnecessaryParenthesesInspection() {