/// <summary>
/// Parse the header of a G-code file
/// </summary>
/// <param name="reader">Stream reader</param>
/// <param name="partialFileInfo">G-code file information</param>
/// <returns>Asynchronous task</returns>
private static async Task ParseHeader(StreamReader reader, ParsedFileInfo partialFileInfo)
{
// Every time CTS.Token is accessed a copy is generated. Hence we cache one until this method completes
CancellationToken token = Program.CancelSource.Token;
Code code = new Code();
bool inRelativeMode = false, lastLineHadInfo = false, enforcingAbsolutePosition = false;
do
{
token.ThrowIfCancellationRequested();
// Read another line
string line = await reader.ReadLineAsync();
if (line == null)
{
break;
}
// See what codes to deal with
bool gotNewInfo = false;
using (StringReader stringReader = new StringReader(line))
{
while (Code.Parse(stringReader, code, ref enforcingAbsolutePosition))
{
if (code.Type == CodeType.GCode && partialFileInfo.FirstLayerHeight == 0)
{
if (code.MajorNumber == 91)
{
// G91 code (relative positioning)
inRelativeMode = true;
gotNewInfo = true;
}
else if (inRelativeMode)
{
// G90 (absolute positioning)
inRelativeMode = (code.MajorNumber != 90);
gotNewInfo = true;
}
else if (code.MajorNumber == 0 || code.MajorNumber == 1)
{
// G0/G1 is a move, see if there is a Z parameter present
CodeParameter zParam = code.Parameter('Z');
if (zParam != null)
{
float z = zParam;
if (z <= Settings.MaxLayerHeight)
{
partialFileInfo.FirstLayerHeight = z;
gotNewInfo = true;
}
}
}
}
else if (!string.IsNullOrWhiteSpace(code.Comment))
{
gotNewInfo |= partialFileInfo.LayerHeight == 0 && FindLayerHeight(line, ref partialFileInfo);
gotNewInfo |= FindFilamentUsed(line, ref partialFileInfo);
gotNewInfo |= string.IsNullOrEmpty(partialFileInfo.GeneratedBy) && FindGeneratedBy(line, ref partialFileInfo);
gotNewInfo |= partialFileInfo.PrintTime == 0 && FindPrintTime(line, ref partialFileInfo);
gotNewInfo |= partialFileInfo.SimulatedTime == 0 && FindSimulatedTime(line, ref partialFileInfo);
}
code.Reset();
}
}
// Is the file info complete?
if (!gotNewInfo && !lastLineHadInfo && IsFileInfoComplete(partialFileInfo))
{
break;
}
lastLineHadInfo = gotNewInfo;
}while (reader.BaseStream.Position < Settings.FileInfoReadLimitHeader + Settings.FileInfoReadBufferSize);
}
/// <summary>
/// Parse the footer of a G-code file
/// </summary>
/// <param name="reader">Stream reader</param>
/// <param name="partialFileInfo">G-code file information</param>
/// <returns>Asynchronous task</returns>
private static async Task ParseFooter(StreamReader reader, ParsedFileInfo partialFileInfo)
{
CancellationToken token = Program.CancelSource.Token;
reader.BaseStream.Seek(0, SeekOrigin.End);
Code code = new Code();
bool inRelativeMode = false, lastLineHadInfo = false, hadFilament = partialFileInfo.Filament.Count > 0, enforcingAbsolutePosition = false;
char[] buffer = new char[Settings.FileInfoReadBufferSize];
int bufferPointer = 0;
do
{
token.ThrowIfCancellationRequested();
// Read another line
ReadLineFromEndResult readResult = await ReadLineFromEndAsync(reader, buffer, bufferPointer);
if (readResult == null)
{
break;
}
bufferPointer = readResult.BufferPointer;
// See what codes to deal with
bool gotNewInfo = false;
using (StringReader stringReader = new StringReader(readResult.Line))
{
while (Code.Parse(stringReader, code, ref enforcingAbsolutePosition))
{
if (code.Type == CodeType.GCode && partialFileInfo.Height == 0)
{
if (code.MajorNumber == 90)
{
// G90 code (absolute positioning) implies we were in relative mode
inRelativeMode = true;
gotNewInfo = true;
}
else if (inRelativeMode)
{
// G91 code (relative positioning) implies we were in absolute mode
inRelativeMode = (code.MajorNumber != 91);
gotNewInfo = true;
}
else if (code.MajorNumber == 0 || code.MajorNumber == 1)
{
// G0/G1 is an absolute move, see if there is a Z parameter present
CodeParameter zParam = code.Parameter('Z');
if (zParam != null && (code.Comment == null || !code.Comment.TrimStart().StartsWith("E")))
{
gotNewInfo = true;
partialFileInfo.Height = zParam;
}
}
}
else if (!string.IsNullOrWhiteSpace(code.Comment))
{
gotNewInfo |= partialFileInfo.LayerHeight == 0 && FindLayerHeight(readResult.Line, ref partialFileInfo);
gotNewInfo |= !hadFilament && FindFilamentUsed(readResult.Line, ref partialFileInfo);
gotNewInfo |= string.IsNullOrEmpty(partialFileInfo.GeneratedBy) && FindGeneratedBy(readResult.Line, ref partialFileInfo);
gotNewInfo |= partialFileInfo.PrintTime == 0 && FindPrintTime(readResult.Line, ref partialFileInfo);
gotNewInfo |= partialFileInfo.SimulatedTime == 0 && FindSimulatedTime(readResult.Line, ref partialFileInfo);
}
code.Reset();
}
}
// Is the file info complete?
if (!gotNewInfo && !lastLineHadInfo && IsFileInfoComplete(partialFileInfo))
{
break;
}
lastLineHadInfo = gotNewInfo;
}while (reader.BaseStream.Length - reader.BaseStream.Position < Settings.FileInfoReadLimitFooter + buffer.Length);
}
