/// <summary>
/// Preparse to build line number dictionary.
/// </summary>
private void RebuildLineNumbers()
{
_lineNumberMap.Clear();
var offsets = new List <long>();
Bytecode.Seek(0, SeekOrigin.Begin);
var scanPosition = 0L;
while (true)
{
Bytecode.ReadByte(); // pass \x00
var scanline = Bytecode.ReadLineNumber();
if (scanline == -1)
{
// if parse_line_number returns -1, it leaves the stream pointer here: 00 _00_ 00 1A
break;
}
_lineNumberMap[scanline] = scanPosition;
Bytecode.SkipUntilLineEnd();
scanPosition = Bytecode.Position;
offsets.Add(scanPosition);
}
_lineNumberMap[BasicLastLineNumber] = scanPosition;
// rebuild offsets
Bytecode.Seek(0, SeekOrigin.Begin);
var lastPosition = 0L;
foreach (var postion in offsets)
{
Bytecode.ReadByte();
Bytecode.Write(((int)(Position + 1 + postion)).ToBasicUnsignedInteger());
Bytecode.Read((int)(postion - lastPosition - 3));
lastPosition = postion;
}
// ensure program is properly sealed - last offset must be 00 00. keep, but ignore, anything after.
Bytecode.Write("\0\0\0");
}