convert to nested ifs: accept no containing block

plugins/IntentionPowerPak/src/com/siyeh/ipp/trivialif/ConvertToNestedIfIntention.java

@@ -56,10 +56,16 @@ public class ConvertToNestedIfIntention extends Intention {
     final PsiElementFactory elementFactory = JavaPsiFacade.getInstance(project).getElementFactory();
     final PsiBlockStatement blockStatement = (PsiBlockStatement)elementFactory.createStatementFromText("{" + newStatementText + "}", returnStatement);
     final PsiElement parent = returnStatement.getParent();
-    for (PsiStatement st : blockStatement.getCodeBlock().getStatements()) {
-      CodeStyleManager.getInstance(project).reformat(parent.addBefore(st, returnStatement));
+    if (parent instanceof PsiCodeBlock) {
+      for (PsiStatement st : blockStatement.getCodeBlock().getStatements()) {
+        CodeStyleManager.getInstance(project).reformat(parent.addBefore(st, returnStatement));
+      }
+      PsiReplacementUtil.replaceStatement(returnStatement, "return false;", tracker);
+    }
+    else {
+      blockStatement.getCodeBlock().add(elementFactory.createStatementFromText("return false;", returnStatement));
+      tracker.replaceAndRestoreComments(returnStatement, blockStatement);
     }
-    PsiReplacementUtil.replaceStatement(returnStatement, "return false;", tracker);
   }
 
   private static StringBuilder buildIf(@Nullable PsiExpression expression,

plugins/IntentionPowerPak/test/com/siyeh/ipp/trivialif/convert_to_nested_if/NoBraces.java

@@ -0,0 +1,9 @@
+package com.siyeh.ipp.trivialif.convert_to_nested_if;
+
+public class X {
+  
+    boolean m(boolean a, boolean b, boolean c) {
+        if (a) return <caret>b || c;//c1
+        return false;//c2
+    }
+}

plugins/IntentionPowerPak/test/com/siyeh/ipp/trivialif/convert_to_nested_if/NoBraces_after.java

@@ -0,0 +1,14 @@
+package com.siyeh.ipp.trivialif.convert_to_nested_if;
+
+public class X {
+  
+    boolean m(boolean a, boolean b, boolean c) {
+        //c1
+        if (a) {
+            if (b) r<caret>eturn true;
+            if (c) return true;
+            return false;
+        }
+        return false;//c2
+    }
+}

plugins/IntentionPowerPak/testSrc/com/siyeh/ipp/trivialif/ConvertToNestedIfIntentionTest.java

@@ -22,6 +22,7 @@ public class ConvertToNestedIfIntentionTest extends IPPTestCase {
 
   public void testNested() { doTest(); }
   public void testStaircase() { doTest(); }
+  public void testNoBraces() { doTest(); }
   public void testStaircaseWithParenthesis() { doTest(); }
   public void testStaircaseWithOrInside() { doTest(); }
   public void testOrStaircaseInside() { doTest(); }