main.py

import os


def calculating(cal):

    value = cal[0]

    for i in range(1, len(cal)):

        if cal[i] == "+":

            i += 1

            if cal[i] == "+" or cal[i] == "-":

                print("Syntax Error ; Double operator")
                exit(0)

            value += cal[i]

        elif cal[i] == "-":

            i += 1

            if cal[i] == "+" or cal[i] == "-":

                print("Syntax Error ; Double operator")
                exit(0)

            value -= cal[i]

    cal.clear()

    return value


# ";"
def gmr_1(stack, cal, n, isN):

    if isN:

        cal.append(n)
        n = 0
        isN = False

    stack.append(calculating(cal))

    return stack, cal, n, isN


# ":"
def gmr_2(stack, cal, n, isN):

    im = stack[len(stack) - 1]

    if isN:

        cal.append(str(n) + im)
        n = 0
        isN = False

    else:

        cal.append(im)

    return stack, cal, n, isN


# "."
def gmr_3(stack, cal, n, isN):

    if isN:

        cal.append(n)
        n = 0
        isN = False

    stack.pop()

    return stack, cal, n, isN


# "+"
def gmr_4(stack, cal, n, isN):

    if isN:

        cal.append(n)
        n = 0
        isN = False

    cal.append("+")

    return stack, cal, n, isN


# "-"
def gmr_5(stack, cal, n, isN):

    if isN:

        cal.append(n)
        n = 0
        isN = False

    cal.append("-")

    return stack, cal, n, isN


# "!"
def gmr_6(stack, cal, n, isN):

    if isN:

        cal.append(n)
        n = 0
        isN = False

    print(calculating(cal))

    return stack, cal, n, isN


def lexer(code):

    stack = []
    cal = []
    n = 0
    isN = False

    gmr_list = {";": gmr_1, ":": gmr_2, ".": gmr_3, "+": gmr_4, "-": gmr_5, "!": gmr_6}

    if code[-1] != "!":
        print("Error")
        exit(0)

    for i in range(0, len(code)):

        grm_run = gmr_list.get(code[i], "False")

        if grm_run == "False":

            pass

        else:

            stack, cal, n, isN = grm_run(stack, cal, n, isN)

        if "0" <= code[i] <= "9":

            n = n * 10 + int(code[i])
            isN = True


if __name__ == "__main__":

    code = input("semi > ")

    lexer(code)