BrainFuck Parser

import java.util.Scanner;

public class BrainFuck
{
    static final Scanner IN = new Scanner(System.in);

    static
    {
        Runtime.getRuntime().addShutdownHook(new Thread(IN::close));
    }

    public static void parse(Instruction[] instructions)
    {
        short[] memory = new short[256];
        short ptr = 0;

        boolean continueToEndOfLoop = false;
        int skips = 0;

        for(int index = 0; index < instructions.length; ++index)
        {
            Instruction i = instructions[index];
            if(continueToEndOfLoop)
            {
                if(i == Instruction.LOOP_BEGIN) { ++skips; }
                else if(i == Instruction.LOOP_END)
                {
                    if(skips > 0)
                    {
                        --skips;
                        continue;
                    }
                    continueToEndOfLoop = false;
                }
                continue;
            }
            switch(i)
            {
                case INCREMENT_POINTER:
                    ++ptr;
                    break;
                case DECREMENT_POINTER:
                    --ptr;
                    break;
                case INCREMENT:
                    ++memory[ptr];
                    break;
                case DECREMENT:
                    --memory[ptr];
                    break;
                case PRINT_CHAR:
                    System.out.print((char) memory[ptr]);
                    break;
                case GET_CHAR:
                    memory[ptr] = (short) IN.nextByte();
                    break;
                case LOOP_BEGIN:
                    if(memory[ptr] == 0) { continueToEndOfLoop = true; }
                    break;
                case LOOP_END:
                    while(true)
                    {
                        --index;
                        if(instructions[index] == Instruction.LOOP_END) { ++skips; }
                        else if(instructions[index] == Instruction.LOOP_BEGIN)
                        {
                            if(skips > 0) { --skips; }
                            else
                            {
                                --index;
                                break;
                            }
                        }
                    }
                    break;
            }
        }
    }

    public static Instruction[] parse(String in)
    {
        in = in.replaceAll("[^><+\\-.,\\[\\]]", "");
        Instruction[] out = new Instruction[in.length()];
        for(int i = 0; i < in.length(); ++i) { out[i] = Instruction.get(in.charAt(i)); }
        return out;
    }

    public static void cString(Instruction[] instructions)
    {
        for(Instruction i : instructions) { System.out.println(i.cString); }
    }

    public static void main(String[] args)
    {
//        parse(parse("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++.>"));
//        parse(parse("++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."));
//        cString(instructions);
        parse(parse(args[0]));
    }

    public enum Instruction
    {
        INCREMENT_POINTER('>', "++ptr"),
        DECREMENT_POINTER('<', "--ptr"),
        INCREMENT('+', "++(*ptr)"),
        DECREMENT('-', "--(*ptr)"),
        PRINT_CHAR('.', "putchar(*ptr);"),
        GET_CHAR(',', "*ptr = getchar();"),
        LOOP_BEGIN('[', "while(*ptr != 0) {"),
        LOOP_END(']', "}");

        public static final com.hyfloac.brainfuck.Instruction[] VALUES = values();

        public final char identifier;
        public final String cString;

        Instruction(char identifier, String cString)
        {
            this.identifier = identifier;
            this.cString = cString;
        }

        public static com.hyfloac.brainfuck.Instruction get(char c)
        {
            for(com.hyfloac.brainfuck.Instruction i : VALUES)
            {
                if(i.identifier == c)
                {
                    return i;
                }
            }
            return null;
        }
    }
}