public void AddLine(string Text, LineIdentifier LineId)
{
var text = this.ScrubNewLineFromEnd(Text);
// the start pos of the line.
int startPos = _sb.Length;
// add to the stream.
_sb.Append(text + Environment.NewLine);
_Stream = null;
// end pos of the line.
int endPos = _sb.Length - 1;
// LineLocation stores the LineId of the line and its position within the stream.
LineLocation loc = new LineLocation(LineId, startPos, endPos);
// ScanLine stores the text of the line and its LineLocation.
ScanLine sl = new ScanLine(text, loc);
// list of lines.
_Lines.Add(sl);
// update the highest assigned lineid.
if (LineId.IntValue.Value > _HighLineId)
{
_HighLineId = LineId.IntValue.Value;
}
}
private Tuple <LineLocation, int> FindLineLocation(LineIdentifier LineId, int StartIx)
{
LineLocation found = null;
int ix = StartIx;
int nbrLines = this.Lines.Count;
while (true)
{
if (ix >= nbrLines)
{
found = null;
break;
}
ScanLine scanLine = this.Lines[ix];
if (scanLine.LineId.Equals(LineId))
{
found = scanLine.Location;
break;
}
// advance to the next line.
ix += 1;
}
return(new Tuple <LineLocation, int>(found, ix));
}
public TextLocation ToTextLocation(ScanStream Lookup)
{
LineLocation found = null;
// find the LineLocation on which the StreamIndex is located.
foreach (var line in Lookup.Lines)
{
var loc = line.Location;
if ((this.Value >= loc.StartIndex) && (this.Value <= loc.EndIndex))
{
found = loc;
break;
}
else if (loc.StartIndex > this.Value)
{
break;
}
}
// location not found.
if (found == null)
{
throw new ApplicationException("stream location " + this.Value.ToString() +
" is not found.");
}
TextLocation textLoc =
new TextLocation(found.LineId, this.Value - found.StartIndex);
return(textLoc);
}
public LineLocation FindLineLocation(LineIdentifier LineId)
{
LineLocation found = null;
int foundIx = 0;
// start the search from last found line index.
int ix = 0;
if (this.CurrentLineIndex != null)
{
ix = this.CurrentLineIndex.Value;
}
// search from starting line forward.
{
var rv = this.FindLineLocation(LineId, ix);
found = rv.Item1;
foundIx = rv.Item2;
}
// not found. seach from line 0 to the end.
if (found == null)
{
var rv = this.FindLineLocation(LineId, 0);
found = rv.Item1;
foundIx = rv.Item2;
}
// store the last found line index.
if (found != null)
{
this.CurrentLineIndex = foundIx;
}
// error if not found.
if (found == null)
{
throw new ApplicationException("Line not found");
}
return(found);
}
public ScanLine(string Text, LineLocation Location)
{
this.Text = Text;
this.Location = Location;
}