Tweak processing algorithm scope -- parameters should be available even if algorithm is unset

nyalldawson · nyalldawson · commit 8e49e94d92a8 · 2018-09-22T05:26:29.000+10:00
diff --git a/src/core/qgsexpressioncontext.cpp b/src/core/qgsexpressioncontext.cpp
@@ -1297,14 +1297,14 @@ QgsExpressionContextScope *QgsExpressionContextUtils::processingAlgorithmScope(
   Q_UNUSED( context );
 
   std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope( QObject::tr( "Algorithm" ) ) );
+  scope->addFunction( QStringLiteral( "parameter" ), new GetProcessingParameterValue( parameters ) );
+
   if ( !algorithm )
     return scope.release();
 
   //add standard algorithm variables
   scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "algorithm_id" ), algorithm->id(), true ) );
 
-  scope->addFunction( QStringLiteral( "parameter" ), new GetProcessingParameterValue( parameters ) );
-
   return scope.release();
 }
 
