private void StartEntry(string type, string line, BsbChartReaderState state)
{
this.FlushEntry(state);
this.type = type;
this.lines.Add(line);
}
private void FlushEntry(BsbChartReaderState state)
{
if (this.type != null)
{
state.TextEntries.Add(new BsbTextEntry(this.type, this.lines.ToArray()));
}
this.Reset();
}
public (ReaderState?, bool?) ReadChart(ref SequenceReader <byte> reader, CancellationToken cancellationToken, BsbChartReaderState state)
{
if (reader.IsNext(RasterEndToken.Span))
{
reader.Advance(RasterEndToken.Length);
if (!this.rowNumber.HasValue)
{
throw new InvalidOperationException("A raster row should start with a row number.");
}
state.RowEntries.Add(this.rowNumber.Value, this.entries.ToArray());
return(ReaderState.RasterSegment, null);
}
if (reader.TryReadVariableLengthValue(out ReadOnlySequence <byte> values))
{
if (this.rowNumber == null)
{
this.rowNumber = ParseRasterRowNumber(values);
}
else
{
if (!state.BitDepth.HasValue)
{
throw new InvalidOperationException("Bit depth must be parsed before the raster segment.");
}
this.entries.Add(ParseRasterRun(values, state.BitDepth.Value));
}
return(null, true);
}
else
{
return(null, false);
}
}
public (ReaderState?, bool?) ReadChart(ref SequenceReader <byte> reader, CancellationToken cancellationToken, BsbChartReaderState state)
{
if (reader.IsNext(RasterEndToken.Span))
{
reader.Advance(RasterEndToken.Length);
return(ReaderState.Done, null);
}
else
{
return(ReaderState.RasterRow, null);
}
}
public (ReaderState?, bool?) ReadChart(ref SequenceReader <byte> reader, CancellationToken cancellationToken, BsbChartReaderState state)
{
if (reader.TryRead(out byte value))
{
state.BitDepth = value;
return(ReaderState.RasterSegment, null);
}
else
{
return(null, false);
}
}
public (ReaderState?, bool?) ReadChart(ref SequenceReader <byte> reader, CancellationToken cancellationToken, BsbChartReaderState state)
{
if (reader.IsNext(TextSegmentEndToken.Span))
{
reader.Advance(TextSegmentEndToken.Length);
this.FlushEntry(state);
return(ReaderState.BitDepth, null);
}
if (reader.TryReadTo(out ReadOnlySequence <byte> text, TextEntryEndToken.Span))
{
// TODO: Use SequenceReader to extract segments?
string line = Encoding.ASCII.GetString(text);
if (line.Length > 0)
{
if (line[0] == '!')
{
this.StartEntry("!", line.Substring(1), state);
}
else if (line.StartsWith(" "))
{
this.lines.Add(line.Substring(4));
}
else
{
int index = line.IndexOf('/');
if (index >= 0)
{
this.StartEntry(line.Substring(0, index), line.Substring(index + 1), state);
}
else
{
this.StartEntry("?", line, state);
}
}
}
return(null, true);
}
else
{
return(null, false);
}
}
