private void HandleLineEndings()
{
if (Configuration.RowEnding != Cesil.RowEndings.Detect)
{
RowEndings = Configuration.RowEnding;
TryMakeStateMachine();
return;
}
using (var detector = new RowEndingDetector <T>(Configuration, SharedCharacterLookup, Inner))
{
var res = detector.Detect();
HandleLineEndingsDetectionResult(res);
}
}
private void HandleLineEndings()
{
var options = Configuration.Options;
if (options.ReadRowEnding != ReadRowEnding.Detect)
{
RowEndings = options.ReadRowEnding;
TryMakeStateMachine();
return;
}
using (var detector = new RowEndingDetector(StateMachine, options, Configuration.MemoryPool, SharedCharacterLookup, Inner, Configuration.ValueSeparatorMemory))
{
var res = detector.Detect();
HandleLineEndingsDetectionResult(res);
}
}
static async ValueTask <(RowEndings Ending, Memory <char> PushBack)?> DetectAsync_ContinueAfterReadAsync(RowEndingDetector <T> self, ValueTask <int> waitFor, CancellationToken cancel)
{
var end = await waitFor;
// handle the results that were in flight
var continueScan = true;
var buffMem = self.BufferOwner.Memory;
if (end == 0)
{
if (self.BufferStart > 0)
{
switch (buffMem.Span[0])
{
case '\r': self.Ending = RowEndings.CarriageReturn; break;
case '\n': self.Ending = RowEndings.LineFeed; break;
}
}
goto end;
}
else
{
self.AddToPushback(buffMem.Slice(self.BufferStart, end));
var len = end + self.BufferStart;
var res = self.Advance(buffMem.Span.Slice(0, len));
switch (res)
{
case AdvanceResult.Continue:
self.BufferStart = 0;
goto loopStart;
case AdvanceResult.Finished:
continueScan = false;
goto loopStart;
case AdvanceResult.Continue_PushBackOne:
buffMem.Span[0] = buffMem.Span[len - 1];
self.BufferStart = 1;
goto loopStart;
default:
return(default);
}
}
// resume the loop
loopStart:
while (continueScan)
{
var mem = self.BufferOwner.Memory.Slice(self.BufferStart, self.BufferOwner.Memory.Length - self.BufferStart);
end = await self.Inner.ReadAsync(mem, cancel);
if (end == 0)
{
buffMem = self.BufferOwner.Memory;
if (self.BufferStart > 0)
{
switch (buffMem.Span[0])
{
case '\r': self.Ending = RowEndings.CarriageReturn; break;
case '\n': self.Ending = RowEndings.LineFeed; break;
}
}
break;
}
else
{
self.AddToPushback(buffMem.Slice(self.BufferStart, end));
var len = end + self.BufferStart;
var res = self.Advance(buffMem.Span.Slice(0, len));
switch (res)
{
case AdvanceResult.Continue:
self.BufferStart = 0;
continue;
case AdvanceResult.Finished:
continueScan = false;
continue;
case AdvanceResult.Continue_PushBackOne:
buffMem.Span[0] = buffMem.Span[len - 1];
self.BufferStart = 1;
continue;
default:
return(default);
}
}
}
end:
if (self.Ending == RowEndings.None)
{
self.Ending = RowEndings.CarriageReturnLineFeed;
}
return(self.Ending, self.Pushback.Slice(0, self.PushbackLength));
}