CS 150 / LAB 1 / Item 1

from enum import Enum

class NumberBase(Enum):
    DECIMAL = 'DECIMAL'
    HEX = 'HEX'
    OCTAL = 'OCTAL'
    BINARY = 'BINARY'

def parse_number_base(str):
    conditions = [
    {'curr_state': 'START', 'input': ['0'], 'next_state': 'ZERO', 'accept': 0},
    {'curr_state': 'START', 'input': [chr(i) for i in range(49,56)],'next_state': 'DEC_OCT_HEX', 'accept': 0},
    {'curr_state': 'START', 'input': ['8','9'], 'next_state': 'DEC_HEX', 'accept': 0},
    {'curr_state': 'ZERO', 'input': ['b','B'], 'next_state': 'BIN_START', 'accept': 1},
    {'curr_state': 'ZERO', 'input': [chr(i) for i in range(48,56)], 'next_state': 'OCT', 'accept': 1},
    {'curr_state': 'ZERO', 'input': ['x','X'], 'next_state': 'HEX_START', 'accept': 1},
    {'curr_state': 'BIN_START','input': ['0','1'], 'next_state': 'BIN', 'accept': 0},
    {'curr_state': 'HEX_START', 'input': [chr(i) for i in range(48,58)] + [chr(j) for j in range(97,103)] + [chr(k) for k in range(65,71)], 'next_state': 'HEX', 'accept': 0},
    {'curr_state': 'BIN', 'input': ['0','1'], 'next_state': 'BIN', 'accept': 1},
    {'curr_state': 'OCT', 'input': [chr(i) for i in range(48,56)], 'next_state': 'OCT', 'accept': 1},
    {'curr_state': 'DEC_OCT_HEX', 'input': [chr(i) for i in range(48,56)], 'next_state': 'DEC_OCT_HEX', 'accept': 1},
    {'curr_state': 'DEC_OCT_HEX', 'input': ['8','9'], 'next_state': 'DEC_HEX', 'accept': 1},
    {'curr_state': 'DEC_OCT_HEX', 'input': [chr(j) for j in range(97,103)] + [chr(k) for k in range(65,71)], 'next_state': 'HEX', 'accept': 1},
    {'curr_state': 'DEC_HEX', 'input': [chr(i) for i in range(48,58)], 'next_state': 'DEC_HEX', 'accept': 1},
    {'curr_state': 'DEC_HEX', 'input': [chr(j) for j in range(97,103)] + [chr(k) for k in range(65,71)], 'next_state': 'HEX', 'accept': 1},
    {'curr_state': 'HEX', 'input': [chr(i) for i in range(48,58)] + [chr(j) for j in range(97,103)] + [chr(k) for k in range(65,71)], 'next_state': 'HEX', 'accept': 1}]

    res = [
    {'final_state': 'ZERO', 'result': NumberBase.DECIMAL},
    {'final_state': 'DEC_OCT_HEX', 'result': NumberBase.DECIMAL},
    {'final_state': 'DEC_HEX', 'result': NumberBase.DECIMAL},
    {'final_state': 'BIN', 'result': NumberBase.BINARY},
    {'final_state': 'OCT', 'result': NumberBase.OCTAL},
    {'final_state': 'HEX', 'result': NumberBase.HEX}]

    current_state = 'START'
    current_char = str[0]
    while(1):
        print("str:",str)
        print("char:",current_char)
        if len(str) == 0:
            for condition in conditions:
                if condition.get('current_state') == current_state and condition.get('accept') == 1:
                    for item in res:
                        if item.get('final_state') == current_state:
                            return item.get('result')
                else:
                    return None
        else:
            current_char = str[0]
            print("current_char",current_char)
            for condition in conditions:
                if (condition.get('curr_state') == current_state) and (current_char in condition.get('input')):
                    current_state = condition.get('next_state')
                str = str[1:]



print(parse_number_base("12345"))