private void DecomposeMethodCall(MethodCallNode methodCallNode, bool isYielding, bool mayPanic)
{
NIType outputType;
// TODO: try to use something like Unit or Void
NIType emptyOutputType = NITypes.Boolean;
switch (methodCallNode.OutputTerminals.Count)
{
case 0:
outputType = emptyOutputType;
break;
case 1:
outputType = methodCallNode.OutputTerminals[0].GetTrueVariable().Type;
break;
default:
outputType = methodCallNode.OutputTerminals.Select(t => t.GetTrueVariable().Type).DefineTupleType();
break;
}
AutoBorrowNodeFacade methodCallNodeFacade = AutoBorrowNodeFacade.GetNodeFacade(methodCallNode);
AwaitNode awaitNode = null;
if (isYielding)
{
CreateMethodCallPromise createMethodCallPromise = new CreateMethodCallPromise(methodCallNode.ParentDiagram, methodCallNode.Signature, methodCallNode.TargetName);
AutoBorrowNodeFacade createMethodCallPromiseFacade = AutoBorrowNodeFacade.GetNodeFacade(createMethodCallPromise);
foreach (var terminalPair in methodCallNode.InputTerminals.Zip(createMethodCallPromise.InputTerminals))
{
Terminal methodCallTerminal = terminalPair.Key, createMethodCallPromiseTerminal = terminalPair.Value;
methodCallTerminal.ConnectedTerminal.ConnectTo(createMethodCallPromiseTerminal);
createMethodCallPromiseFacade[createMethodCallPromiseTerminal] = methodCallNodeFacade[methodCallTerminal];
}
Terminal methodCallOutputTerminal = methodCallNode.OutputTerminals.FirstOrDefault();
NIType awaitOutputType = mayPanic ? outputType.CreatePanicResult() : outputType;
NIType promiseType = awaitOutputType.CreateMethodCallPromise();
Terminal promiseTerminal = createMethodCallPromise.OutputTerminals[0];
createMethodCallPromiseFacade[promiseTerminal] = new SimpleTerminalFacade(
promiseTerminal,
createMethodCallPromise.GetTypeVariableSet().CreateTypeVariableReferenceFromNIType(promiseType));
awaitNode = ConnectNewNodeToOutputTerminalWithOutputFacade(createMethodCallPromise, diagram => new AwaitNode(diagram), awaitOutputType);
VariableSet variableSet = awaitNode.GetVariableSet();
TypeVariableReference outputTypeVariable = awaitNode.OutputTerminal.GetTrueVariable().TypeVariableReference;
TypeVariableReference pollResultTypeVariable = variableSet.TypeVariableSet.CreateReferenceToOptionType(outputTypeVariable);
awaitNode.PollResultVariable = variableSet.CreateNewVariable(
diagramId: 0,
variableType: pollResultTypeVariable,
mutable: false);
}
Node outputNode = awaitNode;
if (mayPanic)
{
Node panicOrContinueInput = awaitNode;
if (!isYielding)
{
// Create PanickingMethodCall as input to PanicOrContinue
throw new NotImplementedException("Calling non-yielding panicking methods not supported yet.");
}
outputNode = ConnectNewNodeToOutputTerminalWithOutputFacade(
panicOrContinueInput,
diagram => new PanicOrContinueNode(diagram),
outputType);
}
Terminal outputNodeTerminal = outputNode.OutputTerminals[0];
switch (methodCallNode.OutputTerminals.Count)
{
case 0:
// no method call output terminals; drop the result of the await
InsertDropTransform.InsertDropForVariable(outputNode.ParentDiagram, LiveVariable.FromTerminal(outputNodeTerminal), _unificationResultFactory);
break;
case 1:
ConnectOutputTerminal(methodCallNode.OutputTerminals[0], outputNodeTerminal);
break;
default:
{
// for >1 method call output terminals, decompose the tuple result of the await and match each
// decomposed terminal to a method call terminal
DecomposeTupleNode decomposeTupleNode = InsertDropTransform.InsertDecompositionForTupleVariable(
methodCallNode.ParentDiagram,
LiveVariable.FromTerminal(outputNodeTerminal),
_unificationResultFactory);
foreach (var pair in methodCallNode.OutputTerminals.Zip(decomposeTupleNode.OutputTerminals))
{
Terminal methodCallTerminal = pair.Key, decomposeTupleTerminal = pair.Value;
ConnectOutputTerminal(methodCallTerminal, decomposeTupleTerminal);
}
break;
}
}
methodCallNode.RemoveFromGraph();
}
private void ConnectOutputTerminal(Terminal outputTerminal, Terminal newOutputTerminal)
{
AutoBorrowNodeFacade nodeToReplaceFacade = AutoBorrowNodeFacade.GetNodeFacade(outputTerminal.ParentNode);
AutoBorrowNodeFacade newTerminalNodeFacade = AutoBorrowNodeFacade.GetNodeFacade(newOutputTerminal.ParentNode);
if (outputTerminal.IsConnected)
{
outputTerminal.ConnectedTerminal.ConnectTo(newOutputTerminal);
newTerminalNodeFacade[newOutputTerminal] = nodeToReplaceFacade[outputTerminal];
}
else
{
InsertDropTransform.InsertDropForVariable(newOutputTerminal.ParentDiagram, LiveVariable.FromTerminal(newOutputTerminal), _unificationResultFactory);
}
}