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grammar_test.py
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grammar_test.py
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import unittest
from grammar import Grammar
from pprint import pprint as pp
class TestGrammar(unittest.TestCase):
def setUp(self):
self.G = Grammar.from_text("""
E → TA
A → +TA | ɛ
T → FB
B → ∗FB | ɛ
F → (E) | a
""")
self.G2 = Grammar.from_text("""
S → ABC
A → ɛ
B -> ɛ
C → ABd
""")
self.G3 = Grammar.from_text("""
S → ABC
A → aA | ɛ
B → b | ɛ
C → c | d
""")
self.G4 = Grammar.from_text("""
S → (S) | a
""")
self.G5 = Grammar.from_text("""
S → Aa | Bb | ac
A → a
B → a
""")
self.G6 = Grammar.from_text("""
E → E*B | E+B | B
B → 0 | 1
""")
def test_V_T(self):
G = self.G
self.assertEqual(len(G.V()),5)
self.assertEqual(len(G.T()),5)
def test_nullable(self):
G = self.G
self.assertTrue(G.is_nullable("B"))
self.assertFalse(G.is_nullable("F"))
G = self.G2
self.assertFalse(G.is_nullable("S"))
def test_FNE(self):
G = self.G
self.assertEqual(G.FNE("E"),{'a','('})
self.assertEqual(G.FNE("T"),{'a','('})
self.assertEqual(G.FNE("F"),{'a','('})
self.assertEqual(G.FNE("A"),{'+'})
self.assertEqual(G.FNE("B"),{'∗'})
G = self.G3
self.assertEqual(G.FNE("A"),{'a'})
self.assertEqual(G.FNE("S"),{'a','b','c','d'})
def test_FOLLOW(self):
G = self.G
self.assertEqual(G.FOLLOW("E"),{'$',')'})
self.assertEqual(G.FOLLOW("T"),{'+','$',')'})
self.assertEqual(G.FOLLOW("F"),{'∗','+','$',')'})
self.assertEqual(G.FOLLOW("A"),{'$',')'})
self.assertEqual(G.FOLLOW("B"),{'+','$',')'})
def test_parse_table(self):
G = self.G
table = G.parse_table(include_conflicts=True)
goal_table = {
'A': {'+': [('A', ['+', 'T', 'A'])]
, ')': [('A', [])],'$': [('A', [])]},
'T': {'a': [('T', ['F', 'B'])], '(': [('T', ['F', 'B'])]},
'E': {'a': [('E', ['T', 'A'])], '(': [('E', ['T', 'A'])]},
'B': {'∗': [('B', ['∗', 'F', 'B'])],'+': [('B', [])],
')': [('B', [])], '$': [('B', [])]},
'F': {'a': [('F', ['a'])], '(': [('F', ['(', 'E', ')'])]}
}
self.assertEqual(table, goal_table)
def test_parse(self):
G = self.G
self.assertTrue(G.parse("a+a∗a",print_steps=False))
def test_lr0(self):
G = self.G4
self.assertEqual(G.state2strstr([("S'", ['S'], 1)]),"S' → S•")
states = G.lr0_states()
self.assertEqual(len(states),6)
G = self.G6
states = G.lr0_states()
G.lr0_pp(states)
G.lr0_full_table(states)
G.lr0_parse("1+1")
G = self.G5
states = G.lr0_states()
self.assertEqual(len(states),8)
def test_slr1(self):
G = self.G5
states = G.lr0_states()
#G.slr1_table(states)
def test_stats(self):
G = self.G
#G.stats()
if __name__ == '__main__':
unittest.main()
"""
final p13
E -> OEE | A
O -> + | *
A -> N | (E)
*(*NN)N
wikipedia lr0
E → E*B | E+B | B
B → 0 | 1
1+1
"""