/// <summary>
/// JumpMan.Cmd entry point
/// </summary>
/// <param name="args">Command line arguments (not used)</param>
static void Main(string[] args)
{
var filePath = "./input";
var reader = new FileReader();
var program = reader
.ReadFileByLines(filePath)
.Select(operation => new Operation(operation));
var cpu = new JumpmanCPU(program);
cpu.AddHaltingRule(
(cpu) => cpu
.Trace
.Select(trace => trace.ProgramCounter)
.Where(counter => counter == cpu.ProgramCounter)
.Count()
> 0
);
cpu.RunProgram();
Console.WriteLine(cpu.Accumulator);
// We can patch the program by editing one instruction from a nop to a jump or vice versa.
// The program ends normaly by having the ProgramCounter exceed the length of the program.
// So detect when that happens.
var arrayProgram = program.ToArray <IOperation>();
IOperation oldOperation;
for (var i = 0; i < arrayProgram.Length; i++)
{
if (arrayProgram[i].OpCode == OpCode.jmp || arrayProgram[i].OpCode == OpCode.nop)
{
oldOperation = arrayProgram[i];
var sign = oldOperation.Argument >= 0 ? "+" : string.Empty;
if (arrayProgram[i].OpCode == OpCode.jmp)
{
arrayProgram[i] = new Operation(string.Format("nop {0}{1}", sign, oldOperation.Argument));
}
else
{
arrayProgram[i] = new Operation(string.Format("jmp {0}{1}", sign, oldOperation.Argument));
}
cpu.LoadNewProgram(arrayProgram);
cpu.RunProgram();
if (cpu.TerminatedNormally)
{
// we did it!
break;
}
else
{
arrayProgram[i] = oldOperation;
}
}
}
Console.WriteLine(cpu.Accumulator);
}
public void AddHaltingRule_GivenValidRule_HaltsInExpectedState(
Func <IJumpmanCPU, bool> rule,
IEnumerable <IOperation> program,
int expectedProgramCounter,
int expectedAccumulator,
bool expectedHalt,
IOperation expectedLastOperation,
IEnumerable <ICPUState> expectedTrace,
bool expectedTermination
)
{
var sut = new JumpmanCPU(program);
Assert.Equal(program, sut.Program);
sut.AddHaltingRule(rule);
sut.RunProgram();
Assert.Equal(expectedProgramCounter, sut.ProgramCounter);
Assert.Equal(expectedAccumulator, sut.Accumulator);
Assert.Equal(expectedHalt, sut.Halt);
Assert.Equal(expectedLastOperation, sut.LastOperation);
Assert.Equal(expectedTermination, sut.TerminatedNormally);
Assert.Equal(expectedTrace.Count(), sut.Trace.Count());
for (var i = 0; i < expectedTrace.Count(); i++)
{
Assert.Equal(expectedTrace.Skip(i).First(), sut.Trace.Skip(i).First());
}
}