public string ExtractBlock(ByteCollection coll)
{
// Read out a block of code that the VehicleEventController can determine vehicle control primitives from
string output = "";
foreach (char c in coll.code.Substring(coll.index))
{
if (c == '[' || c == ']') return output;
output += c;
}
return output;
}
public Controller(Vehicle v, MemoryBank mb, string pathToSourceCode, string pathToInputs)
{
// Create a ByteCollection
collection = new ByteCollection(pathToSourceCode, 300);
collection.FilterCode();
// Create an Interpreter
interpreter = new Interpreter(pathToInputs, this);
interpreter.PrepareToRun(collection);
this.mb = mb;
// Create a VehicleEventControl
vec = new VehicleEventControl(interpreter.ExtractBlock(collection), v);
}
public bool RunNext(ByteCollection coll)
{
// Execute the next instruction
if (coll.index < coll.code.Length) // Only if there is an instruction to execute!
{
char instruction = coll.code[coll.index]; // Read the instruction
char o = '\0';
if (instruction == '+')
{
coll.Get(coll.ptr).Increment(); // Increment memory contents
}
else if (instruction == '-')
{
coll.Get(coll.ptr).Decrement(); // Decrement memory contents
}
else if (instruction == '>')
{
coll.IncrementPointer(); // Increment pointer
}
else if (instruction == '<')
{
coll.DecrementPointer(); // Decrement pointer
}
else if (instruction == '[' && coll.Get(coll.ptr).Read() != 0) loop += 1; // Enter a loop
else if (instruction == '[' && coll.Get(coll.ptr).Read() == 0) loop = forwardTrack(coll, loop); // Exit a loop
else if (instruction == ']') loop = backTrack(coll, loop); // Go back to the start of a loop
else if (instruction == '.') o = coll.Get(coll.ptr).ReadToStdOut(); // Write output to the Controller
else if (instruction == ',') insertInput(coll); // Read input from the input string
// Pass the output to the Controller
if (callback != null) callback.PassCycleResult(new IOutputCallback.CycleResult(instruction, o, coll.ptr, coll.index));
coll.index += 1; // Increment the program counter
return false;
}
else { return true; }
}
public void MoveVehicle(ByteCollection coll)
{
vehicle.MoveTo(coll.ptr);
}
private int backTrack(ByteCollection coll, int loop)
{
// Go to the start of a loop
int goal = loop - 1;
while (loop != goal)
{
coll.index -= 1;
if (coll.code[coll.index] == ']') loop += 1;
else if (coll.code[coll.index] == '[') loop -= 1;
}
coll.index -= 1;
return loop;
}
public void PrepareToRun(ByteCollection coll)
{
// Initialise the counters in anticipation of running a program
loop = 0;
coll.index = 0;
}
private void insertInput(ByteCollection coll)
{
// Read input from the input string
if (inIdx < input.Length)
{
coll.ReplaceByte((int)input[inIdx]);
inIdx++;
}
}
private int forwardTrack(ByteCollection coll, int loop)
{
// Go to the end of a loop
int goal = loop;
while (true)
{
coll.index += 1;
if (coll.code[coll.index] == '[') loop += 1;
else if (coll.code[coll.index] == ']' && loop == goal) return loop - 1;
else if (coll.code[coll.index] == ']') loop -= 1;
}
}