Fix inefficient QString splitting

QString::split with single characters is about 10x faster than
QString::split using QStrings

src/app/qgsoptions.cpp

@@ -2346,11 +2346,11 @@ void QgsOptions::addScaleToScaleList( QListWidgetItem *newItem )
   QListWidgetItem *duplicateItem = mListGlobalScales->findItems( newItem->text(), Qt::MatchExactly ).value( 0 );
   delete duplicateItem;
 
-  int newDenominator = newItem->text().split( QStringLiteral( ":" ) ).value( 1 ).toInt();
+  int newDenominator = newItem->text().split( ':' ).value( 1 ).toInt();
   int i;
   for ( i = 0; i < mListGlobalScales->count(); i++ )
   {
-    int denominator = mListGlobalScales->item( i )->text().split( QStringLiteral( ":" ) ).value( 1 ).toInt();
+    int denominator = mListGlobalScales->item( i )->text().split( ':' ).value( 1 ).toInt();
     if ( newDenominator > denominator )
       break;
   }

src/app/qgsprojectproperties.cpp

@@ -1992,11 +1992,11 @@ void QgsProjectProperties::addScaleToScaleList( QListWidgetItem *newItem )
   QListWidgetItem *duplicateItem = lstScales->findItems( newItem->text(), Qt::MatchExactly ).value( 0 );
   delete duplicateItem;
 
-  int newDenominator = newItem->text().split( QStringLiteral( ":" ) ).value( 1 ).toInt();
+  int newDenominator = newItem->text().split( ':' ).value( 1 ).toInt();
   int i;
   for ( i = 0; i < lstScales->count(); i++ )
   {
-    int denominator = lstScales->item( i )->text().split( QStringLiteral( ":" ) ).value( 1 ).toInt();
+    int denominator = lstScales->item( i )->text().split( ':' ).value( 1 ).toInt();
     if ( newDenominator > denominator )
       break;
   }

src/app/qgsversionmigration.cpp

@@ -201,7 +201,7 @@ QgsError Qgs2To3Migration::migrateSettings()
       if ( line.isEmpty() )
         continue;
 
-      QStringList parts = line.split( ";" );
+      const QStringList parts = line.split( ';' );
 
       Q_ASSERT_X( parts.count() == 2, "QgsVersionMigration::migrateSettings()", "Can't split line in 2 parts." );
 
@@ -327,10 +327,10 @@ QPair<QString, QString> Qgs2To3Migration::transformKey( QString fullOldKey, QStr
 
   if ( newKeyPart.endsWith( "/*" ) )
   {
-    QStringList newKeyparts = newKeyPart.split( "/" );
+    QStringList newKeyparts = newKeyPart.split( '/' );
     // Throw away the *
     newKeyparts.removeLast();
-    QStringList oldKeyParts = fullOldKey.split( "/" );
+    QStringList oldKeyParts = fullOldKey.split( '/' );
     for ( int i = 0; i < newKeyparts.count(); ++i )
     {
       oldKeyParts.replace( i, newKeyparts.at( i ) );

src/gui/qgsmetadatawidget.cpp

@@ -715,7 +715,7 @@ void QgsMetadataWidget::updatePanel() const
     if ( !categories.isEmpty() )
     {
       int row = categories.at( 0 )->row();
-      mCategoriesModel->setStringList( tabKeywords->item( row, 1 )->text().split( QStringLiteral( "," ) ) );
+      mCategoriesModel->setStringList( tabKeywords->item( row, 1 )->text().split( ',' ) );
     }
     else
     {

src/plugins/grass/qgsgrassmapcalc.cpp

@@ -512,7 +512,7 @@ QStringList QgsGrassMapcalc::checkRegion()
 
     struct Cell_head window;
 
-    QStringList mm = obj->value().split( QStringLiteral( "@" ) );
+    QStringList mm = obj->value().split( '@' );
     if ( mm.size() < 1 )
       continue;
 
@@ -571,7 +571,7 @@ bool QgsGrassMapcalc::inputRegion( struct Cell_head *window, QgsCoordinateRefere
 
     struct Cell_head mapWindow;
 
-    QStringList mm = obj->value().split( QStringLiteral( "@" ) );
+    QStringList mm = obj->value().split( '@' );
     if ( mm.size() < 1 )
       continue;
 
@@ -652,7 +652,7 @@ void QgsGrassMapcalc::setOption()
   {
     case QgsGrassMapcalcObject::Map :
     {
-      QStringList mapMapset = mObject->value().split( QStringLiteral( "@" ) );
+      QStringList mapMapset = mObject->value().split( '@' );
       if ( !mMapComboBox->setCurrent( mapMapset.value( 0 ), mapMapset.value( 1 ) ) )
       {
         mMapComboBox->setEditText( mObject->value() );

src/plugins/grass/qgsgrassmodule.cpp

@@ -672,7 +672,7 @@ void QgsGrassModule::run()
         }
         else // option
         {
-          QStringList opt = arg.split( "=" );
+          QStringList opt = arg.split( '=' );
           //env = "GIS_OPT_" + opt.takeFirst().toUpper();
           //env += "=" + opt.join( "=" ); // rejoin rest
           environment.insert( "GIS_OPT_" + opt.takeFirst().toUpper(), opt.join( "=" ) );

src/plugins/grass/qgsgrassmoduleinput.cpp

@@ -858,7 +858,7 @@ QgsGrassModuleInput::QgsGrassModuleInput( QgsGrassModule *module,
     {
       int mask = 0;
 
-      Q_FOREACH ( const QString &typeName, opt.split( "," ) )
+      Q_FOREACH ( const QString &typeName, opt.split( ',' ) )
       {
         mask |= QgsGrass::vectorType( typeName );
       }

src/plugins/grass/qgsgrassmoduleoptions.cpp

@@ -845,7 +845,7 @@ bool QgsGrassModuleStandardOptions::getCurrentMapRegion( QgsGrassModuleInput *in
     return false;
   }
 
-  QStringList mm = input->currentMap().split( QStringLiteral( "@" ) );
+  QStringList mm = input->currentMap().split( '@' );
   QString map = mm.value( 0 );
   QString mapset = QgsGrass::getDefaultMapset();
   if ( mm.size() > 1 )

src/plugins/grass/qgsgrassmoduleparam.cpp

@@ -436,7 +436,7 @@ QgsGrassModuleOption::QgsGrassModuleOption( QgsGrassModule *module, QString key,
         {
           QDomElement e = n.toElement();
           QString val = e.text().trimmed();
-          minMax = val.split( QStringLiteral( "-" ) );
+          minMax = val.split( '-' );
           if ( minMax.size() == 2 )
           {
             mHaveLimits = true;
@@ -902,7 +902,7 @@ void QgsGrassModuleGdalInput::updateQgisLayers()
       }
       else if ( vector->providerType() == QLatin1String( "ogr" ) )
       {
-        QStringList items = provider->dataSourceUri().split( QStringLiteral( "|" ) );
+        QStringList items = provider->dataSourceUri().split( '|' );
 
         if ( items.size() > 1 )
         {
@@ -913,7 +913,7 @@ void QgsGrassModuleGdalInput::updateQgisLayers()
 
           for ( int i = 1; i < items.size(); i++ )
           {
-            QStringList args = items[i].split( QStringLiteral( "=" ) );
+            QStringList args = items[i].split( '=' );
 
             if ( args.size() != 2 )
               continue;
@@ -1219,7 +1219,7 @@ void QgsGrassModuleSelection::onLayerChanged()
     {
       QString uri = vectorLayer->dataProvider()->dataSourceUri();
       QgsDebugMsg( "uri = " + uri );
-      QString layerCode = uri.split( QStringLiteral( "/" ) ).last();
+      QString layerCode = uri.split( '/' ).last();
       if ( mLayerInput->currentLayerCodes().contains( layerCode ) )
       {
         // Qt::UserRole+1 may be also uri (AddLayer) but hardly matching layer id
@@ -1464,7 +1464,7 @@ void QgsGrassModuleFile::browse()
 
   if ( mType == Multiple )
   {
-    QString path = mLineEdit->text().split( QStringLiteral( "," ) ).first();
+    QString path = mLineEdit->text().split( ',' ).first();
     if ( path.isEmpty() )
       path = lastDir;
     else

src/providers/arcgisrest/qgsafsprovider.cpp

@@ -59,7 +59,7 @@ QgsAfsProvider::QgsAfsProvider( const QString &uri )
   mLayerDescription = layerData[QStringLiteral( "description" )].toString();
 
   // Set extent
-  QStringList coords = mSharedData->mDataSource.param( QStringLiteral( "bbox" ) ).split( QStringLiteral( "," ) );
+  QStringList coords = mSharedData->mDataSource.param( QStringLiteral( "bbox" ) ).split( ',' );
   if ( coords.size() == 4 )
   {
     bool xminOk = false, yminOk = false, xmaxOk = false, ymaxOk = false;

src/providers/arcgisrest/qgsamsdataitems.cpp

@@ -103,7 +103,7 @@ QVector<QgsDataItem *> QgsAmsConnectionItem::createChildren()
   QString format = QStringLiteral( "jpg" );
   bool found = false;
   QList<QByteArray> supportedFormats = QImageReader::supportedImageFormats();
-  foreach ( const QString &encoding, serviceData["supportedImageFormatTypes"].toString().split( "," ) )
+  foreach ( const QString &encoding, serviceData["supportedImageFormatTypes"].toString().split( ',' ) )
   {
     foreach ( const QByteArray &fmt, supportedFormats )
     {

src/providers/arcgisrest/qgsamssourceselect.cpp

@@ -44,7 +44,7 @@ bool QgsAmsSourceSelect::connectToService( const QgsOwsConnection &connection )
     return false;
   }
 
-  populateImageEncodings( serviceInfoMap[QStringLiteral( "supportedImageFormatTypes" )].toString().split( QStringLiteral( "," ) ) );
+  populateImageEncodings( serviceInfoMap[QStringLiteral( "supportedImageFormatTypes" )].toString().split( ',' ) );
 
   QStringList layerErrors;
   foreach ( const QVariant &layerInfo, serviceInfoMap["layers"].toList() )

src/providers/arcgisrest/qgsarcgisrestutils.cpp

@@ -388,7 +388,7 @@ QVariantMap QgsArcGisRestUtils::getObjects( const QString &layerurl, const QList
   QUrl queryUrl( layerurl + "/query" );
   queryUrl.addQueryItem( QStringLiteral( "f" ), QStringLiteral( "json" ) );
   queryUrl.addQueryItem( QStringLiteral( "objectIds" ), ids.join( QStringLiteral( "," ) ) );
-  QString wkid = crs.indexOf( QLatin1String( ":" ) ) >= 0 ? crs.split( QStringLiteral( ":" ) )[1] : QLatin1String( "" );
+  QString wkid = crs.indexOf( QLatin1String( ":" ) ) >= 0 ? crs.split( ':' )[1] : QLatin1String( "" );
   queryUrl.addQueryItem( QStringLiteral( "inSR" ), wkid );
   queryUrl.addQueryItem( QStringLiteral( "outSR" ), wkid );
   QString outFields = fetchAttributes.join( QStringLiteral( "," ) );

src/providers/grass/qgsgrass.cpp

@@ -1515,7 +1515,7 @@ QStringList QgsGrass::grassObjects( const QgsGrassObject &mapsetObject, QgsGrass
           fullName = fullName.trimmed();
           if ( !fullName.isEmpty() )
           {
-            QStringList nameMapset = fullName.split( QStringLiteral( "@" ) );
+            QStringList nameMapset = fullName.split( '@' );
             if ( nameMapset.value( 1 ) == mapsetObject.mapset() || nameMapset.value( 1 ).isEmpty() )
             {
               list << nameMapset.value( 0 );
@@ -2133,7 +2133,7 @@ QgsRectangle QgsGrass::extent( const QString &gisdbase, const QString &location,
   try
   {
     QString str = getInfo( QStringLiteral( "window" ), gisdbase, location, mapset, map, type );
-    QStringList list = str.split( QStringLiteral( "," ) );
+    QStringList list = str.split( ',' );
     if ( list.size() != 4 )
     {
       throw QgsGrass::Exception( "Cannot parse GRASS map extent: " + str );
@@ -2157,7 +2157,7 @@ void QgsGrass::size( const QString &gisdbase, const QString &location, const QSt
   try
   {
     QString str = getInfo( QStringLiteral( "size" ), gisdbase, location, mapset, map, QgsGrassObject::Raster );
-    QStringList list = str.split( QStringLiteral( "," ) );
+    QStringList list = str.split( ',' );
     if ( list.size() != 2 )
     {
       throw QgsGrass::Exception( "Cannot parse GRASS map size: " + str );
@@ -2250,7 +2250,7 @@ QMap<QString, QString> QgsGrass::query( const QString &gisdbase, const QString &
   try
   {
     QString str = getInfo( QStringLiteral( "query" ), gisdbase, location, mapset, map, type, x, y );
-    QStringList list = str.trimmed().split( QStringLiteral( ":" ) );
+    QStringList list = str.trimmed().split( ':' );
     if ( list.size() == 2 )
     {
       result[list[0]] = list[1];

src/providers/grass/qgsgrassprovidermodule.cpp

@@ -559,8 +559,8 @@ QVector<QgsDataItem *> QgsGrassMapsetItem::createChildren()
       // somewhere not properly escaped (there was bug in QgsMimeDataUtils for example)
       QString uri = mDirPath + "/" + name + "/" + layerName;
       QgsLayerItem::LayerType layerType = QgsLayerItem::Vector;
-      QString typeName = layerName.split( QStringLiteral( "_" ) ).value( 1 );
-      QString baseLayerName = layerName.split( QStringLiteral( "_" ) ).value( 0 );
+      QString typeName = layerName.split( '_' ).value( 1 );
+      QString baseLayerName = layerName.split( '_' ).value( 0 );
 
       if ( typeName == QLatin1String( "point" ) || typeName == QLatin1String( "node" ) )
         layerType = QgsLayerItem::Point;

src/providers/grass/qgsgrassrasterprovider.cpp

@@ -675,7 +675,7 @@ double QgsGrassRasterValue::value( double x, double y, bool *ok )
 
   // TODO: use doubles instead of strings
 
-  QStringList list = str.trimmed().split( QStringLiteral( ":" ) );
+  QStringList list = str.trimmed().split( ':' );
   if ( list.size() == 2 )
   {
     if ( list[1] == QLatin1String( "error" ) ) return value;

src/providers/wfs/qgswfsprovider.cpp

@@ -285,7 +285,7 @@ bool QgsWFSProvider::processSQL( const QString &sqlString, QString &errorMsg, QS
   if ( sql.hasParserError() )
   {
     QString parserErrorString( sql.parserErrorString() );
-    QStringList parts( parserErrorString.split( QStringLiteral( "," ) ) );
+    QStringList parts( parserErrorString.split( ',' ) );
     parserErrorString.clear();
     Q_FOREACH ( const QString &part, parts )
     {

src/server/services/wfs/qgswfsparameters.cpp

@@ -383,7 +383,7 @@ namespace QgsWfs
 
     if ( !bbox.isEmpty() )
     {
-      QStringList corners = bbox.split( "," );
+      const QStringList corners = bbox.split( ',' );
 
       if ( corners.size() == 4 )
       {

src/server/services/wfs/qgswfstransaction.cpp

@@ -933,7 +933,7 @@ namespace QgsWfs
       }
 
       // get bbox corners
-      QStringList corners = bbox.split( "," );
+      const QStringList corners = bbox.split( ',' );
       if ( corners.size() != 4 )
       {
         throw QgsRequestNotWellFormedException( QStringLiteral( "BBOX has to be composed of 4 elements: '%1'" ).arg( bbox ) );

src/server/services/wfs/qgswfstransaction_1_0_0.cpp

@@ -916,7 +916,7 @@ namespace QgsWfs
         }
 
         // get bbox corners
-        QStringList corners = bbox.split( "," );
+        const QStringList corners = bbox.split( ',' );
         if ( corners.size() != 4 )
         {
           throw QgsRequestNotWellFormedException( QStringLiteral( "BBOX has to be composed of 4 elements: '%1'" ).arg( bbox ) );

src/server/services/wms/qgswmsparameters.cpp

@@ -882,7 +882,7 @@ namespace QgsWms
 
     if ( !bbox.isEmpty() )
     {
-      QStringList corners = bbox.split( "," );
+      QStringList corners = bbox.split( ',' );
 
       if ( corners.size() == 4 )
       {
@@ -1670,7 +1670,7 @@ namespace QgsWms
     QMultiMap<QString, QString> layerFilters;
     Q_FOREACH ( QString f, filter )
     {
-      QStringList splits = f.split( ":" );
+      const QStringList splits = f.split( ':' );
       if ( splits.size() == 2 )
       {
         layerFilters.insert( splits[0], splits[1] );
@@ -1687,7 +1687,7 @@ namespace QgsWms
     QMultiMap<QString, QString> layerSelections;
     Q_FOREACH ( QString s, selection )
     {
-      QStringList splits = s.split( ":" );
+      const QStringList splits = s.split( ':' );
       if ( splits.size() == 2 )
       {
         layerSelections.insert( splits[0], splits[1] );
@@ -1728,7 +1728,7 @@ namespace QgsWms
         it = layerSelections.find( layer );
         while ( it != layerSelections.end() && it.key() == layer )
         {
-          param.mSelection << it.value().split( "," );
+          param.mSelection << it.value().split( ',' );
           ++it;
         }
       }

tests/src/core/testqgsmaprendererjob.cpp

@@ -294,7 +294,7 @@ void TestQgsMapRendererJob::testFourAdjacentTiles()
     QgsMapSettings mapSettings;
 
     //extent
-    QStringList rectCoords = bboxList.at( i ).split( QStringLiteral( "," ) );
+    QStringList rectCoords = bboxList.at( i ).split( ',' );
     if ( rectCoords.size() != 4 )
     {
       QFAIL( "bbox string invalid" );