public void Execute(Interpreter interpreter)
{
var forState = interpreter.PopForLoop();
if (VariableName != forState.VariableName)
{
interpreter.ErrorWriter.WriteLine($"! FOR and NEXT variable name mismatch. Expected {forState.VariableName}, got {VariableName}");
interpreter.Stop();
return;
}
var loopValue = interpreter.ReadVariable(VariableName);
loopValue++;
interpreter.WriteVariable(VariableName, loopValue);
if (loopValue <= forState.Limit)
{
interpreter.PushForLoop(forState);
interpreter.GotoLine(forState.StartingLineNumber);
}
else
{
interpreter.AdvanceLine();
}
}
public void Execute(Interpreter interpreter)
{
var result = Expression.Calculate(interpreter);
interpreter.WriteVariable(VariableName, result);
interpreter.AdvanceLine();
}
public void Execute(Interpreter interpreter)
{
interpreter.WriteVariable(_variableName, _fromValue);
interpreter.AdvanceLine();
var forState = interpreter.CreateForState(_variableName, _toValue);
interpreter.PushForLoop(forState);
}
public void Execute(Interpreter interpreter)
{
interpreter.OutputWriter.Write("? ");
var input = interpreter.InputReader.ReadLine();
var value = int.Parse(input);
interpreter.WriteVariable(VariableName, value);
interpreter.AdvanceLine();
}
public void Execute(Interpreter interpreter)
{
foreach (var printArgument in PrintArguments)
{
interpreter.OutputWriter.Write(printArgument.ToString(interpreter));
}
interpreter.OutputWriter.WriteLine();
interpreter.AdvanceLine();
}
public void Execute(Interpreter interpreter)
{
if (Equation.Solve(interpreter))
{
interpreter.GotoLine(TargetLineNumber);
}
else
{
interpreter.AdvanceLine();
}
}
public void Execute(Interpreter interpreter)
{
try
{
interpreter.PopLineNumber();
interpreter.AdvanceLine();
}
catch (InvalidOperationException)
{
interpreter.ErrorWriter.WriteLine($"! Call stack empty");
interpreter.Stop();
}
}
