public string Verbose()
{
var result = GetType().Name;
if (_position != null)
{
var start = _position.Start;
var end = _position.End;
var line = end.Line;
var symbol = Math.Min(start.Symbol, end.Symbol);
var length = Math.Abs(end.Symbol - start.Symbol);
result += $" at {line + 1}:{symbol + 1}:{length}:";
if (Source != null)
{
var prevLine = Source.FetchLine(line - 1, null);
var errorPart = Source.Highlight(line, symbol, length);
var nextLine = Source.FetchLine(line + 1, null);
var codePart = "*----------------------------*\n";
if (prevLine != null)
{
codePart += prevLine + "\n";
}
codePart += errorPart;
if (nextLine != null)
{
codePart += "\n" + nextLine;
}
codePart += "\n*----------------------------*";
result += "\n\n" + codePart;
}
}
return(result + "\n\n" + ToString());
}