fix crash when a sink parameter definition is missing in a processing alg (#34978)

python/core/auto_generated/processing/qgsprocessingalgorithm.sip.in

@@ -623,7 +623,7 @@ Evaluates the parameter with matching ``name`` to a static boolean value.
 %End
 
     QgsFeatureSink *parameterAsSink( const QVariantMap &parameters, const QString &name, QgsProcessingContext &context, QString &destinationIdentifier /Out/,
-                                     const QgsFields &fields, QgsWkbTypes::Type geometryType = QgsWkbTypes::NoGeometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem(), QgsFeatureSink::SinkFlags sinkFlags = 0 ) const /Factory/;
+                                     const QgsFields &fields, QgsWkbTypes::Type geometryType = QgsWkbTypes::NoGeometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem(), QgsFeatureSink::SinkFlags sinkFlags = 0 ) const throw( QgsProcessingException ) /Factory/;
 %Docstring
 Evaluates the parameter with matching ``name`` to a feature sink.
 
@@ -637,6 +637,8 @@ The ``destinationIdentifier`` argument will be set to a string which can be used
 to the sink, e.g. via calling :py:func:`QgsProcessingUtils.mapLayerFromString()`
 
 This function creates a new object and the caller takes responsibility for deleting the returned object.
+
+:raises :: py:class:`QgsProcessingException`
 %End
 
     QgsProcessingFeatureSource *parameterAsSource( const QVariantMap &parameters, const QString &name, QgsProcessingContext &context ) const /Factory/;

python/core/auto_generated/processing/qgsprocessingparameters.sip.in

@@ -754,7 +754,7 @@ This function creates a new object and the caller takes responsibility for delet
 
     static QgsFeatureSink *parameterAsSink( const QgsProcessingParameterDefinition *definition, const QVariant &value,
                                             const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs,
-                                            QgsProcessingContext &context, QString &destinationIdentifier /Out/, QgsFeatureSink::SinkFlags sinkFlags = 0 ) /Factory/;
+                                            QgsProcessingContext &context, QString &destinationIdentifier /Out/, QgsFeatureSink::SinkFlags sinkFlags = 0 ) throw( QgsProcessingException ) /Factory/;
 %Docstring
 Evaluates the parameter with matching ``definition`` and ``value`` to a feature sink.
 
@@ -768,6 +768,8 @@ to the sink, e.g. via calling :py:func:`QgsProcessingUtils.mapLayerFromString()`
 
 This function creates a new object and the caller takes responsibility for deleting the returned object.
 
+:raises :: py:class:`QgsProcessingException`
+
 .. versionadded:: 3.4
 %End
 

scripts/sipify.pl

@@ -1210,8 +1210,8 @@ while ($LINE_IDX < $LINE_COUNT){
     # multiline definition (parenthesis left open)
     if ( $MULTILINE_DEFINITION != MULTILINE_NO ){
         dbg_info("on multiline");
-        # https://regex101.com/r/DN01iM/2
+        # https://regex101.com/r/DN01iM/4
-        if ( $LINE =~ m/^([^()]+(\((?:[^()]++|(?1))*\)))*[^()]*\)[^()]*$/){
+        if ( $LINE =~ m/^([^()]+(\((?:[^()]++|(?1))*\)))*[^()]*\)([^()](throw\([^()]+\))?)*$/){
             dbg_info("ending multiline");
             # remove potential following body
             if ( $MULTILINE_DEFINITION != MULTILINE_CONDITIONAL_STATEMENT && $LINE !~ m/(\{.*\}|;)\s*(\/\/.*)?$/ ){

src/core/processing/qgsprocessingalgorithm.cpp

@@ -599,7 +599,14 @@ bool QgsProcessingAlgorithm::parameterAsBoolean( const QVariantMap &parameters,
 
 QgsFeatureSink *QgsProcessingAlgorithm::parameterAsSink( const QVariantMap &parameters, const QString &name, QgsProcessingContext &context, QString &destinationIdentifier, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, QgsFeatureSink::SinkFlags sinkFlags ) const
 {
-  return QgsProcessingParameters::parameterAsSink( parameterDefinition( name ), parameters, fields, geometryType, crs, context, destinationIdentifier, sinkFlags );
+  try
+  {
+    return QgsProcessingParameters::parameterAsSink( parameterDefinition( name ), parameters, fields, geometryType, crs, context, destinationIdentifier, sinkFlags );
+  }
+  catch ( QgsProcessingException )
+  {
+    throw QgsProcessingException( QObject::tr( "No parameter definition for the sink '%1'" ).arg( name ) );
+  }
 }
 
 QgsProcessingFeatureSource *QgsProcessingAlgorithm::parameterAsSource( const QVariantMap &parameters, const QString &name, QgsProcessingContext &context ) const

src/core/processing/qgsprocessingalgorithm.h

@@ -628,9 +628,11 @@ class CORE_EXPORT QgsProcessingAlgorithm
      * to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().
      *
      * This function creates a new object and the caller takes responsibility for deleting the returned object.
+     *
+     * \throws QgsProcessingException
      */
     QgsFeatureSink *parameterAsSink( const QVariantMap &parameters, const QString &name, QgsProcessingContext &context, QString &destinationIdentifier SIP_OUT,
-                                     const QgsFields &fields, QgsWkbTypes::Type geometryType = QgsWkbTypes::NoGeometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem(), QgsFeatureSink::SinkFlags sinkFlags = nullptr ) const SIP_FACTORY;
+                                     const QgsFields &fields, QgsWkbTypes::Type geometryType = QgsWkbTypes::NoGeometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem(), QgsFeatureSink::SinkFlags sinkFlags = nullptr ) const SIP_THROW( QgsProcessingException ) SIP_FACTORY;
 
     /**
      * Evaluates the parameter with matching \a name to a feature source.

src/core/processing/qgsprocessingparameters.cpp

@@ -548,6 +548,10 @@ QgsFeatureSink *QgsProcessingParameters::parameterAsSink( const QgsProcessingPar
       return nullptr;
     }
     // fall back to default
+    if ( !definition )
+    {
+      throw QgsProcessingException( QObject::tr( "No parameter definition for the sink" ) );
+    }
     dest = definition->defaultValue().toString();
   }
   else

src/core/processing/qgsprocessingparameters.h

@@ -821,12 +821,12 @@ class CORE_EXPORT QgsProcessingParameters
      * to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().
      *
      * This function creates a new object and the caller takes responsibility for deleting the returned object.
-     *
+     * \throws QgsProcessingException
      * \since QGIS 3.4
      */
     static QgsFeatureSink *parameterAsSink( const QgsProcessingParameterDefinition *definition, const QVariant &value,
                                             const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs,
-                                            QgsProcessingContext &context, QString &destinationIdentifier SIP_OUT, QgsFeatureSink::SinkFlags sinkFlags = nullptr ) SIP_FACTORY;
+                                            QgsProcessingContext &context, QString &destinationIdentifier SIP_OUT, QgsFeatureSink::SinkFlags sinkFlags = nullptr ) SIP_THROW( QgsProcessingException ) SIP_FACTORY;
 
     /**
      * Evaluates the parameter with matching \a definition to a feature source.