Switch QString ref functions to QStringView

src/app/main.cpp

@@ -1434,7 +1434,11 @@ int main( int argc, char *argv[] )
         break;
       }
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       coords[i] = myInitialExtent.midRef( posOld, pos - posOld ).toDouble( &ok );
+#else
+      coords[i] = QStringView {myInitialExtent}.mid( posOld, pos - posOld ).toDouble( &ok );
+#endif
       if ( !ok )
         break;
 
@@ -1443,7 +1447,13 @@ int main( int argc, char *argv[] )
 
     // parse last coordinate
     if ( ok )
+    {
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       coords[3] = myInitialExtent.midRef( posOld ).toDouble( &ok );
+#else
+      coords[3] = QStringView {myInitialExtent}.mid( posOld ).toDouble( &ok );
+#endif
+    }
 
     if ( !ok )
     {

src/core/expression/qgsexpression.cpp

@@ -452,7 +452,11 @@ QString QgsExpression::replaceExpressionText( const QString &action, const QgsEx
     if ( exp.hasParserError() )
     {
       QgsDebugMsg( "Expression parser error: " + exp.parserErrorString() );
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       expr_action += action.midRef( start, index - start );
+#else
+      expr_action += QStringView {action}.mid( start, index - start );
+#endif
       continue;
     }
 
@@ -467,7 +471,11 @@ QString QgsExpression::replaceExpressionText( const QString &action, const QgsEx
     if ( exp.hasEvalError() )
     {
       QgsDebugMsg( "Expression parser eval error: " + exp.evalErrorString() );
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       expr_action += action.midRef( start, index - start );
+#else
+      expr_action += QStringView {action}.mid( start, index - start );
+#endif
       continue;
     }
 
@@ -475,7 +483,11 @@ QString QgsExpression::replaceExpressionText( const QString &action, const QgsEx
     expr_action += action.mid( start, pos - start ) + result.toString();
   }
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
   expr_action += action.midRef( index );
+#else
+  expr_action += QStringView {action}.mid( index ).toString();
+#endif
 
   return expr_action;
 }

src/core/qgscolorramp.cpp

@@ -75,7 +75,11 @@ QgsColorRamp *QgsGradientColorRamp::create( const QVariantMap &props )
         continue;
 
       QColor c = QgsSymbolLayerUtils::decodeColor( stop.mid( i + 1 ) );
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       stops.append( QgsGradientStop( stop.leftRef( i ).toDouble(), c ) );
+#else
+      stops.append( QgsGradientStop( QStringView {stop}.left( i ).toDouble(), c ) );
+#endif
     }
   }
 

src/core/qgshstoreutils.cpp

@@ -42,7 +42,7 @@ QVariantMap QgsHstoreUtils::parse( const QString &string )
         while ( i < string.length() && string.at( i ).isSpace() )
           ++i;
 
-        if ( string.midRef( i ).startsWith( sep ) )
+        if ( QStringView{string}.mid( i ).startsWith( sep ) )
         {
           i += sep.length();
         }

src/core/qgsogcutils.cpp

@@ -2680,8 +2680,13 @@ QDomElement QgsOgcUtilsSQLStatementToFilter::toOgcFilter( const QgsSQLStatement:
 static QString mapBinarySpatialToOgc( const QString &name )
 {
   QString nameCompare( name );
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
   if ( name.size() > 3 && name.midRef( 0, 3 ).compare( QLatin1String( "ST_" ), Qt::CaseInsensitive ) == 0 )
     nameCompare = name.mid( 3 );
+#else
+  if ( name.size() > 3 && QStringView {name}.mid( 0, 3 ).toString().compare( QLatin1String( "ST_" ), Qt::CaseInsensitive ) == 0 )
+    nameCompare = name.mid( 3 );
+#endif
   QStringList spatialOps;
   spatialOps << QStringLiteral( "BBOX" ) << QStringLiteral( "Intersects" ) << QStringLiteral( "Contains" ) << QStringLiteral( "Crosses" ) << QStringLiteral( "Equals" )
              << QStringLiteral( "Disjoint" ) << QStringLiteral( "Overlaps" ) << QStringLiteral( "Touches" ) << QStringLiteral( "Within" );
@@ -2697,8 +2702,13 @@ static QString mapBinarySpatialToOgc( const QString &name )
 static QString mapTernarySpatialToOgc( const QString &name )
 {
   QString nameCompare( name );
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
   if ( name.size() > 3 && name.midRef( 0, 3 ).compare( QLatin1String( "ST_" ), Qt::CaseInsensitive ) == 0 )
     nameCompare = name.mid( 3 );
+#else
+  if ( name.size() > 3 && QStringView {name}.mid( 0, 3 ).compare( QLatin1String( "ST_" ), Qt::CaseInsensitive ) == 0 )
+    nameCompare = name.mid( 3 );
+#endif
   if ( nameCompare.compare( QLatin1String( "DWithin" ), Qt::CaseInsensitive ) == 0 )
     return QStringLiteral( "DWithin" );
   if ( nameCompare.compare( QLatin1String( "Beyond" ), Qt::CaseInsensitive ) == 0 )

src/core/qgspostgresstringutils.cpp

@@ -40,7 +40,7 @@ QString QgsPostgresStringUtils::getNextString( const QString &txt, int &i, const
     }
     i += stringRe.cap( 1 ).length() + 2;
     jumpSpace( txt, i );
-    if ( !txt.midRef( i ).startsWith( sep ) && i < txt.length() )
+    if ( !QStringView{txt}.mid( i ).startsWith( sep ) && i < txt.length() )
     {
       QgsMessageLog::logMessage( QObject::tr( "Cannot find separator: %1" ).arg( txt.mid( i ) ), QObject::tr( "PostgresStringUtils" ) );
       return QString();

src/core/qgsstringutils.cpp

@@ -635,13 +635,21 @@ QString QgsStringUtils::wordWrap( const QString &string, const int length, const
       }
       if ( strHit > -1 )
       {
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
         newstr.append( lines.at( i ).midRef( strCurrent, strHit - strCurrent ) );
+#else
+        newstr.append( QStringView {lines.at( i )}.mid( strCurrent, strHit - strCurrent ) );
+#endif
         newstr.append( '\n' );
         strCurrent = strHit + delimiterLength;
       }
       else
       {
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
         newstr.append( lines.at( i ).midRef( strCurrent ) );
+#else
+        newstr.append( QStringView {lines.at( i )}.mid( strCurrent ) );
+#endif
         strCurrent = strLength;
       }
     }

src/providers/postgres/qgspostgresprovider.cpp

@@ -4739,7 +4739,7 @@ QString QgsPostgresProvider::getNextString( const QString &txt, int &i, const QS
     }
     i += stringRe.cap( 1 ).length() + 2;
     jumpSpace( txt, i );
-    if ( !txt.midRef( i ).startsWith( sep ) && i < txt.length() )
+    if ( !QStringView{txt}.mid( i ).startsWith( sep ) && i < txt.length() )
     {
       QgsMessageLog::logMessage( tr( "Cannot find separator: %1" ).arg( txt.mid( i ) ), tr( "PostGIS" ) );
       return QString();
@@ -4752,14 +4752,14 @@ QString QgsPostgresProvider::getNextString( const QString &txt, int &i, const QS
     int start = i;
     for ( ; i < txt.length(); i++ )
     {
-      if ( txt.midRef( i ).startsWith( sep ) )
+      if ( QStringView{txt}.mid( i ).startsWith( sep ) )
       {
-        QStringRef r( txt.midRef( start, i - start ) );
+        QStringView v( QStringView{txt}.mid( start, i - start ) );
         i += sep.length();
-        return r.trimmed().toString();
+        return v.trimmed().toString();
       }
     }
-    return txt.midRef( start, i - start ).trimmed().toString();
+    return QStringView{txt}.mid( start, i - start ).trimmed().toString();
   }
 }
 

src/server/services/wms/qgswmsparameters.cpp

@@ -570,7 +570,11 @@ namespace QgsWms
     const QRegExp composerParamRegExp( QStringLiteral( "^MAP\\d+:" ), Qt::CaseInsensitive );
     if ( key.contains( composerParamRegExp ) )
     {
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       const int mapId = key.midRef( 3, key.indexOf( ':' ) - 3 ).toInt();
+#else
+      const int mapId = QStringView {key}.mid( 3, key.indexOf( ':' ) - 3 ).toInt();
+#endif
       const QString theKey = key.mid( key.indexOf( ':' ) + 1 );
       const QgsWmsParameter::Name name = QgsWmsParameter::name( theKey );
 

tests/bench/main.cpp

@@ -562,8 +562,11 @@ int main( int argc, char *argv[] )
         ok = false;
         break;
       }
-
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
       coords[i] = myInitialExtent.midRef( posOld, pos - posOld ).toDouble( &ok );
+#else
+      coords[i] = QStringView {myInitialExtent}.mid( posOld, pos - posOld ).toDouble( &ok );
+#endif
       if ( !ok )
         break;
 
@@ -571,8 +574,13 @@ int main( int argc, char *argv[] )
     }
 
     // parse last coordinate
+#if QT_VERSION < QT_VERSION_CHECK(5, 15, 2)
     if ( ok )
       coords[3] = myInitialExtent.midRef( posOld ).toDouble( &ok );
+#else
+    if ( ok )
+      coords[3] = QStringView {myInitialExtent}.mid( posOld ).toDouble( &ok );
+#endif
 
     if ( !ok )
     {