private bool TryHandleAwait(AwaitExpressionSyntax @await)
{
if (@await == null)
{
return(false);
}
if (AsyncAwait.TryGetAwaitedInvocation(@await, this.semanticModel, this.cancellationToken, out InvocationExpressionSyntax invocation))
{
this.awaits = true;
var symbol = this.semanticModel.GetSymbolSafe(invocation, this.cancellationToken);
if (symbol != null)
{
if (symbol.DeclaringSyntaxReferences.Length == 0)
{
this.AddReturnValue(invocation);
}
else
{
return(this.TryHandleInvocation(invocation));
}
}
return(true);
}
return(false);
}
private void AddReturnValue(ExpressionSyntax value)
{
if (this.awaits)
{
if (AsyncAwait.TryAwaitTaskRun(value, this.semanticModel, this.cancellationToken, out ExpressionSyntax awaited))
{
using (var walker = this.GetRecursive(awaited))
{
if (walker.values.Count == 0)
{
this.values.Add(awaited);
}
else
{
foreach (var returnValue in walker.values)
{
this.AddReturnValue(returnValue);
}
}
}
return;
}
if (AsyncAwait.TryAwaitTaskFromResult(value, this.semanticModel, this.cancellationToken, out awaited))
{
this.AddReturnValue(awaited);
return;
}
if (this.search == Search.Recursive &&
value is AwaitExpressionSyntax @await)
{
value = @await.Expression;
}
}
if (this.search == Search.Recursive)
{
if (value is InvocationExpressionSyntax invocation)
{
var method = this.semanticModel.GetSymbolSafe(invocation, this.cancellationToken);
if (method == null ||
method.DeclaringSyntaxReferences.Length == 0)
{
this.values.Add(value);
}
else
{
using (var walker = this.GetRecursive(value))
{
foreach (var returnValue in walker.values)
{
this.AddReturnValue(returnValue);
}
}
}
}
else if (this.recursionLoop.Add(value) &&
this.semanticModel.IsEither <IParameterSymbol, ILocalSymbol>(value, this.cancellationToken))
{
using (var assignedValues = AssignedValueWalker.Borrow(value, this.semanticModel, this.cancellationToken))
{
if (assignedValues.Count == 0)
{
this.values.Add(value);
}
else
{
foreach (var assignment in assignedValues)
{
this.AddReturnValue(assignment);
}
}
}
}
else
{
this.values.Add(value);
}
}
else
{
this.values.Add(value);
}
}