/// <summary>
/// Executes the DEL command.
/// </summary>
public void Execute()
{
int?start = _runEnvironment.CurrentLine.GetLineNumber();
int?end = null;
if (start.HasValue)
{
var token = _runEnvironment.CurrentLine.NextToken();
if (token.Seperator == TokenType.Comma)
{
end = _runEnvironment.CurrentLine.GetLineNumber();
}
}
if (!start.HasValue || !end.HasValue)
{
throw new Exceptions.SyntaxErrorException();
}
_programRepository.DeleteProgramLines(start.Value, end.Value);
// If we're in a program end us and don't allow continue.
if (_runEnvironment.CurrentLine.LineNumber.HasValue)
{
_runEnvironment.ContinueLineNumber = null;
throw new Exceptions.EndException();
}
}