public void TeletypeWithPositionForwardsReads()
{
_mockTeletype = new Mock <ITeletype>();
_mockTeletype.Setup(mt => mt.Width).Returns(80);
_sut = new TeletypeWithPosition(_mockTeletype.Object);
_mockTeletype.Setup(mt => mt.Read()).Returns("RUN");
_sut.Write(">");
Assert.AreNotEqual(1, _sut.Position());
var result = _sut.Read();
Assert.AreEqual("RUN", result);
Assert.AreEqual(1, _sut.Position());
}
/// <summary>
/// Executes the interpreter.
/// </summary>
public void Execute()
{
bool quit = false;
while (!quit)
{
_teletypeWithPosition.NewLine();
_teletypeWithPosition.Write(">");
var command = _teletypeWithPosition.Read();
if (command == null)
{
_runEnvironment.KeyboardBreak = false;
continue;
}
try
{
var parsedLine = _tokeniser.Tokenise(command);
if (parsedLine.LineNumber.HasValue)
{
_programRepository.SetProgramLine(parsedLine);
}
else
{
_runEnvironment.CurrentLine = parsedLine;
quit = _executor.ExecuteLine();
}
}
catch (Exceptions.BreakException endError)
{
if (endError.ErrorMessage != string.Empty)
{
WriteErrorToTeletype(
_runEnvironment.CurrentLine.LineNumber,
endError.ErrorMessage);
}
}
catch (Exceptions.BasicException basicError)
{
WriteErrorToTeletype(
_runEnvironment.DataErrorLine ?? _runEnvironment.CurrentLine?.LineNumber,
"?" + basicError.ErrorMessage + " ERROR");
}
}
}