private void ExecuteBrainfuck(int[] instructions)
{
unchecked
{
int programCounter = 0;
int dataPointer = 0;
byte[] cells = new byte[N_CELLS];
while (programCounter < instructions.Length)
{
int twoProgramCounterPlusOne = programCounter + 1;
switch (instructions[programCounter])
{
case INSTRUCTION_INCREMENT_DATA_POINTER:
dataPointer += instructions[twoProgramCounterPlusOne];
break;
case INSTRUCTION_DECREMENT_DATA_POINTER:
dataPointer -= instructions[twoProgramCounterPlusOne];
break;
case INSTRUCTION_INCREMENT_DATA:
cells[dataPointer] += (byte)instructions[twoProgramCounterPlusOne];
break;
case INSTRUCTION_DECREMENT_DATA:
cells[dataPointer] -= (byte)instructions[twoProgramCounterPlusOne];
break;
case INSTRUCTION_OUTPUT_BYTE:
OutputBuffer.WriteByte(cells[dataPointer]);
break;
case INSTRUCTION_INPUT_BYTE:
cells[dataPointer] = (byte)Console.Read();
break;
case INSTRUCTION_JUMP_FORWARD:
if (cells[dataPointer] == 0)
{
programCounter = instructions[twoProgramCounterPlusOne];
}
break;
case INSTRUCTION_JUMP_BACKWARD:
if (cells[dataPointer] != 0)
{
programCounter = instructions[twoProgramCounterPlusOne];
}
break;
}
programCounter += 2;
}
}
}
private static int RunBrainfuck(string[] args)
{
int obIndex = Array.IndexOf(args, "-ob");
if (args.Length > obIndex + 1)
{
int obTime;
if (int.TryParse(args[obIndex + 1], out obTime))
{
OutputBuffer.Open(obTime);
}
}
Stopwatch time = new Stopwatch();
try
{
using (StreamReader brainfuckReader = new StreamReader(args[0]))
{
string brainfuck = brainfuckReader.ReadToEnd();
time.Start();
return(CreateBrainfuckRunner(args).Run(brainfuck));
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
time.Stop();
OutputBuffer.Close();
if (Array.IndexOf(args, "-time") >= 0 || Array.IndexOf(args, "-t") >= 0)
{
Console.WriteLine();
Console.WriteLine($"Brainfuck program executed in {time.ElapsedMilliseconds} milliseconds ({time.ElapsedTicks} ticks)");
}
}
return(1);
}
private static void ExecuteBrainfuck(string brainfuck)
{
byte[] cells = new byte[N_CELLS];
int programCounter = 0;
int cellPointer = 0;
unchecked
{
int programLength = brainfuck.Length;
while (programCounter < programLength)
{
switch (brainfuck[programCounter])
{
case '>':
cellPointer++;
break;
case '<':
cellPointer--;
break;
case '+':
cells[cellPointer]++;
break;
case '-':
cells[cellPointer]--;
break;
case '.':
OutputBuffer.WriteByte(cells[cellPointer]);
break;
case ',':
cells[cellPointer] = (byte)Console.Read();
break;
case '[':
if (cells[cellPointer] == 0)
{
int bracketPosition = programCounter;
int nBrackets = 1;
while (nBrackets > 0)
{
bracketPosition++;
if (brainfuck[bracketPosition] == '[')
{
nBrackets++;
}
if (brainfuck[bracketPosition] == ']')
{
nBrackets--;
}
}
programCounter = bracketPosition;
}
break;
case ']':
if (cells[cellPointer] != 0)
{
int bracketPosition = programCounter;
int nBrackets = 1;
while (nBrackets > 0)
{
bracketPosition--;
if (brainfuck[bracketPosition] == ']')
{
nBrackets++;
}
if (brainfuck[bracketPosition] == '[')
{
nBrackets--;
}
}
programCounter = bracketPosition;
}
break;
}
programCounter++;
}
}
}
