A basic Brainfuck interpretor in java.

BrainfuckIO.java

package com.azias.test.brainfuckio;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

public class BrainfuckIO {
	//public static byte[] cells; //Values cells
	public static int[] cells; //Values cells
	public static char[] instructions; //BF code
	
	public static int ip = 0; //InstructionPointer
	public static int sp = 0; //StackPointer
	
	public static void main(String[] args) throws IOException {
		cells = new int[255];
		interpret(fileToString("./scripts/BaconIpsum.bf"), 0);
		//interpret(fileToString("./scripts/HelloWorld.bf"), 0);
		
		System.out.print("\n");
		
		//Clean
		if(ip >= instructions.length) {
			instructions = null;
		}
	}
	
	public static void interpret(String bf, int startingPoint) {
		if(instructions == null) {
			if(bf != null && !bf.isEmpty()) {
				instructions = bf.toCharArray();
			} else {
				System.exit(1);
			}
		}
		
		while(ip < instructions.length) {
			if(instructions[ip] == '>') {
				sp++;
			} else if(instructions[ip] == '<') {
				sp--;
			} else if(instructions[ip] == '+') {
				if(cells[sp] < 255)
					cells[sp]++;
				else
					cells[sp] = 0;
			} else if(instructions[ip] == '-') {
				if(cells[sp] > 0)
					cells[sp]--;
				else
					cells[sp] = 255;
			} else if(instructions[ip] == '.') {
				System.out.print((char) cells[sp]);
			} else if(instructions[ip] == ',') {
				//System.out.println("In /");
			} else if(instructions[ip] == '[') {
				if(cells[sp] > 0) {
					ip++;
					interpret(bf, ip);
				} else {
					int tmpip = 1;
					while(true) {
						ip++;
						if(instructions[ip] == '[') {
							tmpip++;
						} else if(instructions[ip] == ']') {
							tmpip--;
							if(tmpip == 0) {
								break;
							}
						}
					}
				}
			} else if(instructions[ip] == ']') {
				ip = startingPoint - 2;
				break;
			}
			
			ip++;
		}
	}
	
	private static String fileToString(String path) throws IOException {
		return new String(Files.readAllBytes(Paths.get(path)), StandardCharsets.UTF_8);
	}
}