static IEnumerableAsync <FileRange.Range> IterateMatchRanges(
IEnumerableAsync <Checkpoint> checkpoints, long threshhold, ProgressAndCancellation progressAndCancellation)
{
return(EnumerableAsync.Produce <FileRange.Range>(async yieldAsync =>
{
FileRange.Range?lastMatch = null;
await checkpoints.ForEach(async checkpoint =>
{
if (lastMatch == null)
{
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(checkpoint.Position, checkpoint.EndPosition);
}
else
{
progressAndCancellation.continuationToken.NextPosition = checkpoint.EndPosition;
progressAndCancellation.HandleTextIterationProgress(checkpoint.EndPosition);
}
}
else
{
FileRange.Range lastMatchVal = lastMatch.Value;
if (checkpoint.Position - lastMatchVal.End < threshhold)
{
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(lastMatchVal.Begin, checkpoint.EndPosition);
}
}
else
{
await yieldAsync.YieldAsync(lastMatchVal);
progressAndCancellation.continuationToken.NextPosition = checkpoint.EndPosition;
progressAndCancellation.HandleTextIterationProgress(checkpoint.EndPosition);
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(checkpoint.Position, checkpoint.EndPosition);
}
else
{
lastMatch = null;
}
}
}
return true;
});
if (lastMatch != null)
{
await yieldAsync.YieldAsync(lastMatch.Value);
}
}));
}
static IEnumerable <FileRange.Range> IterateMatchRanges(
IEnumerable <Checkpoint> checkpoints, long threshhold, ProgressAndCancellation progressAndCancellation)
{
FileRange.Range?lastMatch = null;
foreach (var checkpoint in checkpoints)
{
if (lastMatch == null)
{
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(checkpoint.Position, checkpoint.EndPosition);
}
else
{
progressAndCancellation.continuationToken.NextPosition = checkpoint.EndPosition;
progressAndCancellation.HandleTextIterationProgress(checkpoint.EndPosition);
}
}
else
{
FileRange.Range lastMatchVal = lastMatch.Value;
if (checkpoint.Position - lastMatchVal.End < threshhold)
{
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(lastMatchVal.Begin, checkpoint.EndPosition);
}
}
else
{
yield return(lastMatchVal);
progressAndCancellation.continuationToken.NextPosition = checkpoint.EndPosition;
progressAndCancellation.HandleTextIterationProgress(checkpoint.EndPosition);
if (checkpoint.IsMatch)
{
lastMatch = new FileRange.Range(checkpoint.Position, checkpoint.EndPosition);
}
else
{
lastMatch = null;
}
}
}
}
if (lastMatch != null)
{
yield return(lastMatch.Value);
}
}