loplugin:unnecessaryparen

look for  statements like

    return (function());

Change-Id: I906cf2183489f87225b99b987caca67e39b26cc3
Reviewed-on: https://gerrit.libreoffice.org/41260
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

avmedia/source/viewer/mediawindow_impl.cxx

@@ -302,7 +302,7 @@ const OUString& MediaWindowImpl::getURL() const
 
 bool MediaWindowImpl::isValid() const
 {
-    return( mxPlayer.is() );
+    return mxPlayer.is();
 }
 
 Size MediaWindowImpl::getPreferredSize() const

compilerplugins/clang/unnecessaryparen.cxx

@@ -55,6 +55,7 @@ public:
     bool VisitDoStmt(const DoStmt *);
     bool VisitWhileStmt(const WhileStmt *);
     bool VisitSwitchStmt(const SwitchStmt *);
+    bool VisitReturnStmt(const ReturnStmt* );
     bool VisitCallExpr(const CallExpr *);
     bool TraverseUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *);
     bool TraverseCaseStmt(CaseStmt *);
@@ -162,6 +163,37 @@ bool UnnecessaryParen::VisitSwitchStmt(const SwitchStmt* switchStmt)
     return true;
 }
 
+bool UnnecessaryParen::VisitReturnStmt(const ReturnStmt* returnStmt)
+{
+    if (ignoreLocation(returnStmt))
+        return true;
+    if (returnStmt->getLocStart().isMacroID())
+        return true;
+
+    if (!returnStmt->getRetValue())
+        return true;
+    auto parenExpr = dyn_cast<ParenExpr>(returnStmt->getRetValue()->IgnoreImpCasts());
+    if (!parenExpr)
+        return true;
+    if (parenExpr->getLocStart().isMacroID())
+        return true;
+    // assignments need extra parentheses or they generate a compiler warning
+    auto binaryOp = dyn_cast<BinaryOperator>(parenExpr->getSubExpr());
+    if (binaryOp && binaryOp->getOpcode() == BO_Assign)
+        return true;
+
+    // only non-operator-calls for now
+    auto subExpr = parenExpr->getSubExpr();
+    if (isa<CallExpr>(subExpr) && !isa<CXXOperatorCallExpr>(subExpr))
+    {
+        report(
+            DiagnosticsEngine::Warning, "parentheses immediately inside return statement",
+            parenExpr->getLocStart())
+            << parenExpr->getSourceRange();
+    }
+    return true;
+}
+
 void UnnecessaryParen::VisitSomeStmt(const Stmt *parent, const Expr* cond, StringRef stmtName)
 {
     if (ignoreLocation(parent))

cui/source/customize/cfg.cxx

@@ -3504,7 +3504,7 @@ OUString SvxIconReplacementDialog::ReplaceIconName( const OUString& rMessage )
 sal_uInt16 SvxIconReplacementDialog::ShowDialog()
 {
     Execute();
-    return ( GetCurButtonId() );
+    return GetCurButtonId();
 }
 /*******************************************************************************
 *

cui/source/tabpages/tabarea.cxx

@@ -226,7 +226,7 @@ short SvxAreaTabDialog::Ok()
     // RET_OK is returned, if at least one
     // TabPage returns sal_True in FillItemSet().
     // This happens by default at the moment.
-    return( SfxTabDialog::Ok() );
+    return SfxTabDialog::Ok();
 }
 
 

cui/source/tabpages/tabline.cxx

@@ -173,7 +173,7 @@ short SvxLineTabDialog::Ok()
 
     // We return RET_OK if at least one TabPage in FillItemSet() returns sal_True.
     // We do this by default at the moment.
-    return( SfxTabDialog::Ok() );
+    return SfxTabDialog::Ok();
 }
 
 

dbaccess/source/core/dataaccess/ModelImpl.hxx

@@ -244,7 +244,7 @@ public:
 
     /** determines whether the database document has an embedded data storage
     */
-    bool isEmbeddedDatabase() const { return ( m_sConnectURL.startsWith("sdbc:embedded:") ); }
+    bool isEmbeddedDatabase() const { return m_sConnectURL.startsWith("sdbc:embedded:"); }
 
     /** stores the embedded storage ("database")
 

drawinglayer/source/primitive2d/baseprimitive2d.cxx

@@ -231,7 +231,7 @@ namespace drawinglayer
                 return false;
             }
 
-            return (pA->operator==(*pB));
+            return pA->operator==(*pB);
         }
 
         bool Primitive2DContainer::operator==(const Primitive2DContainer& rB) const

drawinglayer/source/primitive3d/baseprimitive3d.cxx

@@ -178,7 +178,7 @@ namespace drawinglayer
                 return false;
             }
 
-            return (pA->operator==(*pB));
+            return pA->operator==(*pB);
         }
 
         bool Primitive3DContainer::operator==(const Primitive3DContainer& rB) const

drawinglayer/source/primitive3d/textureprimitive3d.cxx

@@ -197,7 +197,7 @@ namespace drawinglayer
 
         bool TransparenceTexturePrimitive3D::operator==(const BasePrimitive3D& rPrimitive) const
         {
-            return (GradientTexturePrimitive3D::operator==(rPrimitive));
+            return GradientTexturePrimitive3D::operator==(rPrimitive);
         }
 
         // provide unique ID

editeng/source/accessibility/AccessibleSelectionBase.cxx

@@ -49,7 +49,7 @@ namespace accessibility
     sal_Bool SAL_CALL AccessibleSelectionBase::isAccessibleChildSelected( sal_Int32 nChildIndex )
     {
         ::osl::MutexGuard aGuard( implGetMutex() );
-        return( OCommonAccessibleSelection::isAccessibleChildSelected( nChildIndex ) );
+        return OCommonAccessibleSelection::isAccessibleChildSelected( nChildIndex );
     }
 
 
@@ -70,7 +70,7 @@ namespace accessibility
     sal_Int32 SAL_CALL AccessibleSelectionBase::getSelectedAccessibleChildCount(  )
     {
         ::osl::MutexGuard aGuard( implGetMutex() );
-        return( OCommonAccessibleSelection::getSelectedAccessibleChildCount() );
+        return OCommonAccessibleSelection::getSelectedAccessibleChildCount();
     }
 
 

framework/source/uiconfiguration/uiconfigurationmanager.cxx

@@ -1244,7 +1244,7 @@ sal_Bool SAL_CALL UIConfigurationManager::hasStorage()
     if ( m_bDisposed )
         throw DisposedException();
 
-    return ( m_xDocConfigStorage.is() );
+    return m_xDocConfigStorage.is();
 }
 
 // XUIConfigurationPersistence

i18npool/source/transliteration/transliteration_commonclass.cxx

@@ -101,7 +101,7 @@ transliteration_commonclass::compareSubstring(
 sal_Int32 SAL_CALL
 transliteration_commonclass::compareString( const OUString& str1, const OUString& str2 )
 {
-    return( compareSubstring(str1, 0, str1.getLength(), str2, 0, str2.getLength()));
+    return compareSubstring(str1, 0, str1.getLength(), str2, 0, str2.getLength());
 }
 
 OUString SAL_CALL

include/osl/module.hxx

@@ -123,7 +123,7 @@ public:
 
     void* SAL_CALL getSymbol( const ::rtl::OUString& strSymbolName)
     {
-    return ( osl_getSymbol( m_Module, strSymbolName.pData ) );
+        return osl_getSymbol( m_Module, strSymbolName.pData );
     }
 
     /** Get function address by the function name in the module.
@@ -140,7 +140,7 @@ public:
     */
     oslGenericFunction SAL_CALL getFunctionSymbol( const ::rtl::OUString& ustrFunctionSymbolName ) const
     {
-        return ( osl_getFunctionSymbol( m_Module, ustrFunctionSymbolName.pData ) );
+        return osl_getFunctionSymbol( m_Module, ustrFunctionSymbolName.pData );
     }
 
     /// @since LibreOffice 3.5

include/osl/thread.hxx

@@ -208,7 +208,7 @@ public:
     */
     bool SAL_CALL setData(void *pData)
     {
-           return (osl_setThreadKeyData(m_hKey, pData));
+           return osl_setThreadKeyData(m_hKey, pData);
     }
 
     /** Get the data associated with the data key.

lotuswordpro/source/filter/lwplayout.cxx

@@ -659,7 +659,7 @@ double LwpMiddleLayout::GetGeometryHeight()
     LwpLayoutGeometry* pGeo = GetGeometry();
     if(pGeo)
     {
-        return ( LwpTools::ConvertFromUnitsToMetric( pGeo->GetHeight() ) );
+        return LwpTools::ConvertFromUnitsToMetric( pGeo->GetHeight() );
     }
     else
         return -1;
@@ -674,7 +674,7 @@ double LwpMiddleLayout::GetGeometryWidth()
     LwpLayoutGeometry* pGeo = GetGeometry();
     if(pGeo)
     {
-        return ( LwpTools::ConvertFromUnitsToMetric( pGeo->GetWidth() ) );
+        return LwpTools::ConvertFromUnitsToMetric( pGeo->GetWidth() );
     }
     else
         return -1;

lotuswordpro/source/filter/lwppara.cxx

@@ -904,8 +904,8 @@ XFContentContainer* LwpPara::AddBulletList(XFContentContainer* pCont)
         m_nLevel = nLevel;//for get para level
     }
 
-    return ( pBulletStyleMgr->AddBulletList(pCont, bOrdered, m_aBulletStyleName,
+    return pBulletStyleMgr->AddBulletList(pCont, bOrdered, m_aBulletStyleName,
-            nLevel, m_pBullOver->IsSkip()) );
+            nLevel, m_pBullOver->IsSkip());
 }
 
 LwpNumberingOverride* LwpPara::GetParaNumbering()

registry/source/keyimpl.cxx

@@ -201,7 +201,7 @@ RegError ORegKey::getKeyNames(const OUString& keyName,
 
 RegError ORegKey::closeKey(RegKeyHandle hKey)
 {
-    return (m_pRegistry->closeKey(hKey));
+    return m_pRegistry->closeKey(hKey);
 }
 
 
@@ -209,7 +209,7 @@ RegError ORegKey::closeKey(RegKeyHandle hKey)
 
 RegError ORegKey::deleteKey(const OUString& keyName)
 {
-    return (m_pRegistry->deleteKey(this, keyName));
+    return m_pRegistry->deleteKey(this, keyName);
 }
 
 

sc/inc/addincol.hxx

@@ -219,7 +219,7 @@ public:
     FormulaError        GetErrCode() const      { return nErrCode; }
     bool                HasString() const       { return bHasString; }
     bool                HasMatrix() const       { return xMatrix.get(); }
-    bool                HasVarRes() const       { return ( xVarRes.is() ); }
+    bool                HasVarRes() const       { return xVarRes.is(); }
     double              GetValue() const        { return fValue; }
     const OUString&     GetString() const       { return aString; }
     const ScMatrixRef&  GetMatrix() const       { return xMatrix;}

sc/source/ui/Accessibility/AccessibleDocumentPagePreview.cxx

@@ -1022,7 +1022,7 @@ uno::Reference<XAccessible> ScShapeChildren::GetBackgroundShapeAt(const awt::Poi
 
 ::accessibility::AccessibleShape* ScShapeChildren::GetAccShape(const ScShapeChildVec& rShapes, sal_Int32 nIndex) const
 {
-    return (GetAccShape(rShapes[nIndex]));
+    return GetAccShape(rShapes[nIndex]);
 }
 
 void ScShapeChildren::FillShapes(const tools::Rectangle& aPixelPaintRect, const MapMode& aMapMode, sal_uInt8 nRangeId)

sc/source/ui/inc/fupoor.hxx

@@ -90,7 +90,7 @@ public:
 
     void SetWindow(vcl::Window* pWin) { pWindow = pWin; }
 
-    sal_uInt16 GetSlotID() const { return( aSfxRequest.GetSlot() ); }
+    sal_uInt16 GetSlotID() const { return aSfxRequest.GetSlot(); }
 
     bool    IsDetectiveHit( const Point& rLogicPos );
 

sd/source/core/stlsheet.cxx

@@ -272,7 +272,7 @@ SfxItemSet& SdStyleSheet::GetItemSet()
 
         if (pSdSheet)
         {
-            return(pSdSheet->GetItemSet());
+            return pSdSheet->GetItemSet();
         }
         else
         {

sd/source/ui/dlg/ins_paste.cxx

@@ -42,7 +42,7 @@ void SdInsertPasteDlg::dispose()
 
 bool SdInsertPasteDlg::IsInsertBefore() const
 {
-    return( m_pRbBefore->IsChecked() );
+    return m_pRbBefore->IsChecked();
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sd/source/ui/dlg/inspagob.cxx

@@ -116,7 +116,7 @@ std::vector<OUString> SdInsertPagesObjsDlg::GetList( const sal_uInt16 nType )
  */
 bool SdInsertPagesObjsDlg::IsLink()
 {
-    return( m_pCbxLink->IsChecked() );
+    return m_pCbxLink->IsChecked();
 }
 
 /**
@@ -124,7 +124,7 @@ bool SdInsertPagesObjsDlg::IsLink()
  */
 bool SdInsertPagesObjsDlg::IsRemoveUnnessesaryMasterPages() const
 {
-    return( m_pCbxMasters->IsChecked() );
+    return m_pCbxMasters->IsChecked();
 }
 
 /**

sfx2/inc/srchdlg.hxx

@@ -65,10 +65,10 @@ public:
 
     OUString     GetSearchText() const { return m_pSearchEdit->GetText(); }
     void         SetSearchText( const OUString& _rText ) { m_pSearchEdit->SetText( _rText ); }
-    bool         IsOnlyWholeWords() const { return ( m_pWholeWordsBox->IsChecked() ); }
+    bool         IsOnlyWholeWords() const { return m_pWholeWordsBox->IsChecked(); }
-    bool         IsMarchCase() const { return ( m_pMatchCaseBox->IsChecked() ); }
+    bool         IsMarchCase() const { return m_pMatchCaseBox->IsChecked(); }
-    bool         IsWrapAround() const { return ( m_pWrapAroundBox->IsChecked() ); }
+    bool         IsWrapAround() const { return m_pWrapAroundBox->IsChecked(); }
-    bool         IsSearchBackwards() const { return ( m_pBackwardsBox->IsChecked() ); }
+    bool         IsSearchBackwards() const { return m_pBackwardsBox->IsChecked(); }
 
     void            SetFocusOnEdit();
 

sfx2/source/doc/DocumentMetadataAccess.cxx

@@ -401,7 +401,7 @@ isPartOfType(struct DocumentMetadataAccess_Impl const & i_rImpl,
                 getURI<rdf::URIs::RDF_TYPE>(i_rImpl.m_xContext),
                 i_xType.get()),
             uno::UNO_SET_THROW);
-        return (xEnum->hasMoreElements());
+        return xEnum->hasMoreElements();
     } catch (const uno::RuntimeException &) {
         throw;
     } catch (const uno::Exception & e) {

store/source/storpage.hxx

@@ -142,7 +142,7 @@ private:
 
 inline bool OStorePageManager::isValid() const
 {
-    return (base::isValid() /* @@@ NYI && (m_aRoot.is()) */);
+    return base::isValid() /* @@@ NYI && (m_aRoot.is()) */;
 }
 
 template<> inline OStorePageManager*

svtools/source/misc/transfer.cxx

@@ -639,7 +639,7 @@ void TransferableHelper::ClearFormats()
 bool TransferableHelper::SetAny( const Any& rAny )
 {
     maAny = rAny;
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -661,7 +661,7 @@ bool TransferableHelper::SetString( const OUString& rString, const DataFlavor& r
     else
         maAny <<= rString;
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -689,7 +689,7 @@ bool TransferableHelper::SetBitmapEx( const BitmapEx& rBitmapEx, const DataFlavo
         maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Seek( STREAM_SEEK_TO_END ) );
     }
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -703,7 +703,7 @@ bool TransferableHelper::SetGDIMetaFile( const GDIMetaFile& rMtf )
         maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Seek( STREAM_SEEK_TO_END ) );
     }
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -719,7 +719,7 @@ bool TransferableHelper::SetGraphic( const Graphic& rGraphic )
         maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Seek( STREAM_SEEK_TO_END ) );
     }
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -731,7 +731,7 @@ bool TransferableHelper::SetImageMap( const ImageMap& rIMap )
     rIMap.Write( aMemStm );
     maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Seek( STREAM_SEEK_TO_END ) );
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -744,7 +744,7 @@ bool TransferableHelper::SetTransferableObjectDescriptor( const TransferableObje
     WriteTransferableObjectDescriptor( aMemStm, rDesc );
     maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Tell() );
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
  }
 
 
@@ -833,7 +833,7 @@ bool TransferableHelper::SetINetBookmark( const INetBookmark& rBmk,
         break;
     }
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -847,7 +847,7 @@ bool TransferableHelper::SetINetImage( const INetImage& rINtImg,
 
     maAny <<= Sequence< sal_Int8 >( static_cast< const sal_Int8* >( aMemStm.GetData() ), aMemStm.Seek( STREAM_SEEK_TO_END ) );
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 
@@ -877,7 +877,7 @@ bool TransferableHelper::SetObject( void* pUserObject, SotClipboardFormatId nUse
             maAny <<= aSeq;
     }
 
-    return( maAny.hasValue() );
+    return maAny.hasValue();
 }
 
 

svx/source/gallery2/galctrl.cxx

@@ -382,12 +382,12 @@ void GalleryIconView::KeyInput(const KeyEvent& rKEvt)
 
 sal_Int8 GalleryIconView::AcceptDrop(const AcceptDropEvent& /*rEvt*/)
 {
-    return(static_cast<GalleryBrowser2*>(GetParent())->AcceptDrop(*this));
+    return static_cast<GalleryBrowser2*>(GetParent())->AcceptDrop(*this);
 }
 
 sal_Int8 GalleryIconView::ExecuteDrop(const ExecuteDropEvent& rEvt)
 {
-    return(static_cast<GalleryBrowser2*>(GetParent())->ExecuteDrop(rEvt));
+    return static_cast<GalleryBrowser2*>(GetParent())->ExecuteDrop(rEvt);
 }
 
 void GalleryIconView::StartDrag(sal_Int8, const Point&)
@@ -592,7 +592,7 @@ sal_Int8 GalleryListView::ExecuteDrop( const BrowserExecuteDropEvent& rEvt )
 
     aEvt.maPosPixel.Y() += GetTitleHeight();
 
-    return( static_cast<GalleryBrowser2*>( GetParent() )->ExecuteDrop( aEvt ) );
+    return static_cast<GalleryBrowser2*>( GetParent() )->ExecuteDrop( aEvt );
 }
 
 void GalleryListView::StartDrag( sal_Int8, const Point& rPosPixel )

sw/inc/crsrsh.hxx

@@ -856,7 +856,7 @@ inline SwPaM* SwCursorShell::GetStackCursor() const { return m_pStackCursor; }
 
 inline void SwCursorShell::SetMark() { m_pCurrentCursor->SetMark(); }
 
-inline bool SwCursorShell::HasMark() { return( m_pCurrentCursor->HasMark() ); }
+inline bool SwCursorShell::HasMark() { return m_pCurrentCursor->HasMark(); }
 
 inline bool SwCursorShell::IsSelection() const
 {

sw/source/uibase/uiview/viewdraw.cxx

@@ -627,7 +627,7 @@ bool SwView::IsFormMode() const
 {
     if (GetDrawFuncPtr() && GetDrawFuncPtr()->IsCreateObj())
     {
-        return (GetDrawFuncPtr()->IsInsertForm());
+        return GetDrawFuncPtr()->IsInsertForm();
     }
 
     return AreOnlyFormsSelected();

toolkit/source/awt/vclxtoolkit.cxx

@@ -507,8 +507,8 @@ extern "C"
 {
 static int SAL_CALL ComponentInfoCompare( const void* pFirst, const void* pSecond)
 {
-    return( strcmp( static_cast<ComponentInfo const *>(pFirst)->pName,
+    return strcmp( static_cast<ComponentInfo const *>(pFirst)->pName,
-                    static_cast<ComponentInfo const *>(pSecond)->pName ) );
+                   static_cast<ComponentInfo const *>(pSecond)->pName );
 }
 }
 

ucb/source/ucp/webdav-neon/ContentProperties.cxx

@@ -353,7 +353,7 @@ bool ContentProperties::containsAllNames(
         }
     }
 
-    return ( rNamesNotContained.empty() );
+    return rNamesNotContained.empty();
 }
 
 

unotools/source/config/eventcfg.cxx

@@ -308,7 +308,7 @@ Type SAL_CALL GlobalEventConfig_Impl::getElementType(  )
 
 bool SAL_CALL GlobalEventConfig_Impl::hasElements(  )
 {
-    return ( m_eventBindingHash.empty() );
+    return m_eventBindingHash.empty();
 }
 
 // and now the wrapper

vcl/source/edit/txtattr.cxx

@@ -87,7 +87,7 @@ TextAttrib*     TextAttribProtect::Clone() const
 
 bool TextAttribProtect::operator==( const TextAttrib& rAttr ) const
 {
-    return ( TextAttrib::operator==(rAttr ) );
+    return TextAttrib::operator==(rAttr );
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/source/gdi/gfxlink.cxx

@@ -73,7 +73,7 @@ const sal_uInt8* GfxLink::GetData() const
     if( IsSwappedOut() )
         const_cast<GfxLink*>(this)->SwapIn();
 
-    return( mpSwapInData.get() );
+    return mpSwapInData.get();
 }
 
 

vcl/source/outdev/nativecontrols.cxx

@@ -163,7 +163,7 @@ bool OutputDevice::IsNativeControlSupported( ControlType nType, ControlPart nPar
         if ( !AcquireGraphics() )
             return false;
 
-    return( mpGraphics->IsNativeControlSupported(nType, nPart) );
+    return mpGraphics->IsNativeControlSupported(nType, nPart);
 }
 
 bool OutputDevice::HitTestNativeScrollbar(