hack-assembler/Code.cs at main · happy-turtle/hack-assembler · GitHub

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using System.Collections.Generic;

///<summary>
///Translates the Hack Assembly mnemonics to binary machine code.
///</summary>
namespace Assembler
{
    static class Code
    {
        static readonly Dictionary<string, string> DestCodes = new Dictionary<string, string>{
            {string.Empty, "000"}, {"M", "001"}, {"D", "010"}, {"MD", "011"},
            {"A", "100"}, {"AM", "101"}, {"AD", "110"}, {"AMD", "111"}
        };
        static readonly Dictionary<string, string> JumpCodes = new Dictionary<string, string>{
            {string.Empty, "000"}, {"JGT", "001"}, {"JEQ", "010"}, {"JGE", "011"},
            {"JLT", "100"}, {"JNE", "101"}, {"JLE", "110"}, {"JMP", "111"}
        };
        static readonly Dictionary<string, string> CompCodes = new Dictionary<string, string>{
            {"0", "0101010"}, {"1", "0111111"}, {"-1", "0111010"}, {"D", "0001100"}, {"A", "0110000"},
            {"!D", "0001111"}, {"!A", "0110011"}, {"-D", "0001111"}, {"-A", "0110011"}, {"D+1", "0011111"},
            {"A+1", "0110111"}, {"D-1", "0001110"}, {"A-1", "0110010"}, {"D+A", "0000010"}, {"D-A", "0010011"},
            {"A-D", "0000111"}, {"D&A", "0000000"}, {"D|A", "0010101"}, {"M", "1110000"}, {"!M", "1110001"},
            {"-M", "1110011"}, {"M+1", "1110111"}, {"M-1", "1110010"}, {"D+M", "1000010"}, {"D-M", "1010011"},
            {"M-D", "1000111"}, {"D&M", "1000000"}, {"D|M", "1010101"}
        };

        public static string Comp(string mnemonic)
        {
            if(CompCodes.TryGetValue(mnemonic, out string value))
                return value;
            else
                return null;
        }

        public static string Dest(string mnemonic)
        {
            if(DestCodes.TryGetValue(mnemonic, out string value))
                return value;
            else
                return null;
        }

        public static string Jump(string mnemonic)
        {
            if(JumpCodes.TryGetValue(mnemonic, out string value))
                return value;
            else
                return null;
        }
    }
}