test: Adapt to changes in lib

test_cfl_cfg.py

 from lib.common import Nonterminal, Terminal, Eps
-from lib.parsing import Parser
+import lib.parser
 import lib.cfl as cfl
 from copy import deepcopy
 
@@ -149,12 +149,11 @@ def test_equal():
 
 
 def test_parser():
-    parser = Parser()
-    pg0 = parser.str_to_cfg("S -> aA | ε | aBC | <foo>C; "
-                            "A -> a; "
-                            "B -> b; "
-                            "C -> c\n"
-                            "<foo> -> aaa")
+    pg0 = lib.parser.cfg("S -> aA | ε | aBC | <foo>C; "
+                         "A -> a; "
+                         "B -> b; "
+                         "C -> c\n"
+                         "<foo> -> aaa")
     assert pg0.terminals == {a, b, c}
     assert pg0.nonterminals == {S, A, B, C, Nonterminal("<foo>")}
     assert pg0.generates("")

test_reg.py

-from lib.parsing import Parser
+import lib.parser
 from lib.dfa import DFA
 
 def is_can(dfa: str) -> bool:
-    parser = Parser()
     return parse(dfa).is_canonical()
     
 def parse(dfa: str) -> DFA:
-    parser = Parser()
-    return parser.str_to_dfa(dfa)
+    return lib.parser.dfa(dfa)
 
 def to_str(dfa: DFA) -> str:
-    parser = Parser()
-    return parser.dfa_to_str(dfa)
+    return lib.parser.dfa_to_str(dfa)
 
 def test_can() -> None:
     ex1 = "init=1 (1,a)=1 (1,b)=2 (2,b)=1 (2,a)=1 final={2}"