Wrap the library in a package

demo.py

-from parser import Parser
-from common import State, Character, Eps, Terminal, Nonterminal
-from dfa import Composition as comp
+from fja.reg.parser import Parser
+from fja.common import State, Character, Eps, Terminal, Nonterminal
+from fja.reg.dfa import Composition as comp
 from typing import Set, Dict, Tuple, Union
 from copy import deepcopy
 from antlr4 import RecognitionException
-from reg import RegGrammar, DFA, NFA, RegEx
+from fja.reg import RegGrammar, DFA, NFA, RegEx
 
 
 def make_dfa(states: Set[str], characters: Set[str],
@@ -304,4 +304,4 @@ def main():
     regex_test("(∅ + ∅^*).(∅^* + ∅∅^+)")
 
 
-main()
\ No newline at end of file
+main()

fja/__init__.py

+from . import reg
+from . import cfl
+
+__all__ = ["reg", "cfl"]

fja/cfl/__init__.py

+from .grammar import CFG

cfl.py → fja/cfl/grammar.py

@@ -5,8 +5,8 @@ import typing
 from typing_extensions import Final
 from copy import deepcopy
 from collections import deque
-from common import Terminal, Nonterminal
-from reg_automata import IsEquivalentResult  # TODO: to common
+from ..common import Terminal, Nonterminal
+from ..reg.dfa import IsEquivalentResult  # TODO: to common
 import random
 import math
 

reg.py → fja/reg/__init__.py

-from common import Terminal, Nonterminal, State, Character, Eps, Emptyset
-from grammars import RegGrammar
-from dfa import DFA
-from nfa import NFA
-from regex import RegEx
-from parser import Parser, ParsingError
+from ..common import Terminal, Nonterminal, State, Character, Eps, Emptyset
+from .grammars import RegGrammar
+from .dfa import DFA
+from .nfa import NFA
+from .regex import RegEx
+from .parser import Parser, ParsingError
 
 
 class RegGrammar(RegGrammar):

dfa.py → fja/reg/dfa.py

@@ -5,7 +5,7 @@ import enum
 from copy import deepcopy
 from collections import deque
 from string import ascii_uppercase
-from common import Character, State, Terminal, Nonterminal
+from ..common import Character, State, Terminal, Nonterminal
 
 
 class Composition(Enum):
@@ -420,4 +420,4 @@ class DFA:
 
     def is_canonical(self) -> bool:
         canonic = self.canonize()
-        return DFA.is_part_identical(self, canonic)
\ No newline at end of file
+        return DFA.is_part_identical(self, canonic)