/// <summary>
/// Executes the INPUT command.
/// </summary>
public void Execute()
{
var variableReferences = new List <VariableReference>();
// Not valid in immediate mode.
if (!_runEnvironment.CurrentLine.LineNumber.HasValue)
{
throw new Exceptions.IllegalDirectException();
}
// Set the prompt.
_prompt = "?";
var token = _runEnvironment.CurrentLine.NextToken();
if (token.TokenClass == TokenClass.String)
{
_prompt = token.Text;
if (_runEnvironment.CurrentLine.NextToken().Seperator != TokenType.Semicolon)
{
throw new Exceptions.SyntaxErrorException();
}
}
else
{
_runEnvironment.CurrentLine.PushToken(token);
}
do
{
variableReferences.Add(_expressionEvaluator.GetLeftValue());
token = _runEnvironment.CurrentLine.NextToken();
}while (token.Seperator == TokenType.Comma);
_runEnvironment.CurrentLine.PushToken(token);
bool reenterInput = false;
do
{
_firstLine = true;
_readInputParser.Clear();
try
{
reenterInput = false;
_readInputParser.ReadVariables(variableReferences);
}
catch (Exceptions.SyntaxErrorException)
{
_teletype.Write("?RENTER");
_teletype.Write(Environment.NewLine);
reenterInput = true;
}
}while (reenterInput);
if (_readInputParser.HasExtraData)
{
_teletype.Write("?EXTRA IGNORED");
_teletype.Write(Environment.NewLine);
}
}
/// <summary>
/// Lists a single line.
/// </summary>
/// <returns>returns false if last line printed.</returns>
public bool Execute()
{
if (_currentLine != null)
{
if (_currentLine.LineNumber > _endLine)
{
return(true);
}
_teletype.Write(_currentLine.ToString());
_teletype.Write(Environment.NewLine);
_currentLine = _programRepository.GetNextLine(_currentLine.LineNumber.Value);
}
return(_currentLine == null);
}
/// <summary>
/// Prints a new line.
/// </summary>
public void NewLine()
{
_teletype.Write(Environment.NewLine);
_currentPosition = 0;
}