private void PushOrPop(ITokenStateTransition currentTransition,
Stack <ITokenStateTransition> transitions)
{
if (transitions.Count > 0)
{
ITokenStateTransition previousTransition = transitions.Peek();
if ((previousTransition.To == currentTransition.From) &&
(previousTransition.From == currentTransition.To) &&
(previousTransition.Match.Pattern.Equals(currentTransition.Match.Pattern) == false))
{
transitions.Pop();
}
else
{
transitions.Push(currentTransition);
}
}
else
{
if (currentTransition.IsMessageBegin() == true)
{
transitions.Push(currentTransition);
}
}
}
public static bool IsMessageBoundary(ITokenStateTransition first,
ITokenStateTransition second)
{
bool isBegin = first.IsMessageBegin();
bool isEnd = second.IsMessageEnd();
return((isBegin == true) && (isEnd == true));
}
private bool HandleTransition(ITokenStateTransition currentTransition,
Stack <ITokenStateTransition> transitions,
ref ReadOnlySequence <byte> buffer,
ref ReadOnlySequence <byte> token,
out long consumedBytes)
{
consumedBytes = 0;
bool result = false;
if (transitions.Count == 1)
{
ITokenStateTransition previousTransition = transitions.Peek();
if (previousTransition.IsMessageBegin() == true &&
currentTransition.IsMessageEnd() == true)
{
if (this.GetMessageBoundary(previousTransition,
currentTransition,
ref buffer,
ref token,
out consumedBytes) == true)
{
transitions.Pop();
result = true;
}
}
else
{
this.PushOrPop(currentTransition, transitions);
}
}
else
{
this.PushOrPop(currentTransition, transitions);
}
return(result);
}
private bool GetMessageBoundary(ITokenStateTransition previousTransition,
ITokenStateTransition currentTransition,
ref ReadOnlySequence <byte> buffer,
ref ReadOnlySequence <byte> token,
out long consumedBytes)
{
consumedBytes = 0;
bool result = false;
if (TokenStateTransition.IsMessageBoundary(previousTransition, currentTransition) == true)
{
long startIndex = previousTransition.Match.StartIndex;
long length = currentTransition.Match.EndIndex - startIndex;
token = buffer.Slice(startIndex, length);
consumedBytes = startIndex + length;
result = true;
}
return(result);
}
