EMU1.0compiler.py

import base64

lookup = ["add", "add", "sub", "cmp", "or", "or", "xor", "xor", "and", "and", "sh/r", "shl", "shr", "ld", "st", "lbl", "jup", "jdn", "io", "mul"]
cmpluk = ["tr", "fa", "eq", "ne", "sl", "sg", "ul", "ug"]

class Instruction:
    OPC = 0
    A = 0
    B = 0
    C = 0
    cond = 0
    def __init__(self, string):
        string = string.split(";")[0].strip()
        if string.startswith("+"):
            self.cond = 1
            string = string.split("+")[1].strip()
        if string.startswith("-"):
            self.cond = 2
            string = string.split("-")[1].strip()
        OPCode = string.split(" ")[0]
        if OPCode == "add":
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 0 + (1 if string.count("r")==2 else 0)
        if  OPCode == "sub":
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 2
        if OPCode == "or":
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 4 + (1 if string.count("r")==2 else 0)
        if OPCode == "xor":
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 6 + (1 if string.count("r")==2 else 0)
        if OPCode == "and":
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 0o10 + (1 if string.count("r")==2 else 0)
        if OPCode == "shl" and string.count("r") == 3:
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 0o13
        if OPCode == "shr" and string.count("r") == 3:
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
            self.OPC = 0o14
        if OPCode[:3] == "cmp":
            self.OPC = 3
            self.A = 0
            s = string.split(" ", 1)[1]
            self.A = cmpluk.index(string[3:5])
            if "i" in s and "r" in s:
                if s.index("r") < s.index("i"): self.A += 0o20
                else: self.A += 0o30
            self.B = int(string.split(" ")[1].split(",")[0][1:])
            self.C = int(string.split(" ")[2].split(",")[0][1:])
        if OPCode == "shl" and string.count("r") == 2:
            self.OPC = 0o12
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
        if OPCode == "shr" and string.count("r") == 2:
            self.OPC = 0o12
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:]) + 0o10
        if OPCode == "sar":
            self.OPC = 0o12
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:]) + 0o20
        if OPCode == "rol":
            self.OPC = 0o12
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:]) + 0o30
        if OPCode == "ld":
            self.OPC = 0o15
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split("[")[1].split("+")[0].split("]")[0]) if "r" in string else 0
            self.C = 0 if (not "+" in string) and "r" in string else int(string.split("[")[1].split("+")[-1].split("]")[0])
        if OPCode == "st":
            self.OPC = 0o16
            self.A = int(string.split(" ")[2][1:])
            self.B = int(string.split("[")[1].split("+")[0].split("]")[0]) if "r" in string else 0
            self.C = 0 if (not "+" in string) and "r" in string else int(string.split("[")[1].split("+")[-1].split("]")[0])
        if OPCode[:3] == "fmu":
            self.OPC = 0o23
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split("/")[1].split(" ")[0])
        if OPCode[:3] == "fms":
            self.OPC = 0o23
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split("/")[1].split(" ")[0]) + 0o20
        if OPCode == "lbl":
            self.OPC = 0o17
            self.A = int(string.split(" ")[1].split(",")[0])//64
            self.B = int(string.split(" ")[1].split(",")[0])%64
            self.C = int(string.split(" ")[2])
        if OPCode == "jup":
            self.OPC = 0o20
            self.A = int(string.split(" ")[1].split(",")[0])//64
            self.B = int(string.split(" ")[1].split(",")[0])%64
            self.C = int(string.split(" ")[2][1:])
        if OPCode == "jdn":
            self.OPC = 0o21
            self.A = int(string.split(" ")[1].split(",")[0])//64
            self.B = int(string.split(" ")[1].split(",")[0])%64
            self.C = int(string.split(" ")[2][1:])
        if OPCode == "io":
            self.OPC = 0o22
            self.A = int(string.split(" ")[1].split(",")[0][1:])
            self.B = int(string.split(" ")[2].split(",")[0][1:])
            self.C = int(string.split(" ")[3].split(",")[0][1:])
    
    def toBin(self):
        OPC = 21*self.cond + self.OPC + 1
        instr  = OPC << 18
        instr += self.A << 12
        instr += self.B << 6
        instr += self.C
        return instr

Disclaimer: This compiler requires strict placement of spaces and does not include all special cases listed in the EMU 1.0 manual.
It is still capable of compiling all instructions though.