Rework cfg

pyformlang/__init__.py

@@ -26,10 +26,21 @@
 
 """
 
+from . import finite_automaton
+from . import regular_expression
+from . import cfg
+from . import fst
+from . import indexed_grammar
+from . import pda
+from . import rsa
+from . import fcfg
+
+
 __all__ = ["finite_automaton",
            "regular_expression",
            "cfg",
            "fst",
            "indexed_grammar",
            "pda",
-           "rsa"]
+           "rsa",
+           "fcfg"]

pyformlang/cfg/__init__.py

@@ -20,16 +20,15 @@
 
 """
 
-from .variable import Variable
-from .terminal import Terminal
-from .production import Production
-from .cfg import CFG
-from .epsilon import Epsilon
-from .llone_parser import LLOneParser
+from .cfg import CFG, CFGObject, Variable, Terminal, Epsilon, Production
+from .parse_tree import ParseTree, DerivationDoesNotExist
 
-__all__ = ["Variable",
+
+__all__ = ["CFGObject",
+           "Variable",
            "Terminal",
+           "Epsilon",
            "Production",
            "CFG",
-           "Epsilon",
-           "LLOneParser"]
+           "ParseTree",
+           "DerivationDoesNotExist"]