def test_start_symbol(self):
""" Tests the change of the start symbol """
l_rules = []
l_rules.append(EndRule("S", "s"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules, "S2")
self.assertTrue(i_grammar.is_empty())
i_grammar = IndexedGrammar(rules, "S")
self.assertFalse(i_grammar.is_empty())
l_rules = []
l_rules.append(EndRule("S2", "s"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules, start_variable="S2")
self.assertFalse(i_grammar.is_empty())
def test_simple_ig_2(self):
# Write rules
l_rules = []
# Initialization rules
l_rules.append(ProductionRule("S", "Cinit", "end"))
l_rules.append(ProductionRule("Cinit", "C", "b"))
l_rules.append(ConsumptionRule("end", "C", "T"))
l_rules.append(EndRule("T", "epsilon"))
# C[b sigma] -> C[cm sigma] c b C[sigma]
l_rules.append(ConsumptionRule("b", "C", "B"))
l_rules.append(DuplicationRule("B", "A1", "D"))
l_rules.append(ConsumptionRule("b", "A1", "A1"))
l_rules.append(ConsumptionRule("bm", "A1", "A1"))
l_rules.append(ConsumptionRule("c", "A1", "A1"))
l_rules.append(ConsumptionRule("cm", "A1", "A1"))
l_rules.append(ConsumptionRule("end", "A1", "Abackm2"))
l_rules.append(ProductionRule("Abackm2", "Abackm1", "end"))
l_rules.append(ProductionRule("Abackm1", "C", "cm"))
l_rules.append(DuplicationRule("D", "E0", "C"))
l_rules.append(DuplicationRule("E0", "F0", "E1"))
l_rules.append(DuplicationRule("E1", "F1", "E2"))
l_rules.append(EndRule("E2", "epsilon"))
l_rules.append(EndRule("F0", "c"))
l_rules.append(EndRule("F1", "b"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertTrue(i_grammar.is_empty())
def test_simple_ig7(self):
""" Test 7 """
l_rules = []
l_rules.append(ProductionRule("S", "A", "end"))
l_rules.append(ConsumptionRule("end", "A", "S"))
l_rules.append(DuplicationRule("A", "B", "C"))
l_rules.append(EndRule("B", "b"))
l_rules.append(EndRule("C", "c"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_simple_ig6(self):
""" Test number 6 """
l_rules = []
l_rules.append(DuplicationRule("S", "S", "B"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertTrue(i_grammar.is_empty())
l_rules = []
l_rules.append(DuplicationRule("S", "B", "S"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertTrue(i_grammar.is_empty())
l_rules = []
l_rules.append(DuplicationRule("S", "A", "B"))
l_rules.append(EndRule("A", "a"))
l_rules.append(EndRule("B", "b"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_simple_ig8(self):
""" Tests 8 """
l_rules = []
l_rules.append(ProductionRule("S", "Q", "end"))
l_rules.append(ProductionRule("Q", "A", "end"))
l_rules.append(ConsumptionRule("end", "A", "B"))
l_rules.append(ConsumptionRule("end", "A", "C"))
l_rules.append(ConsumptionRule("end", "A", "D"))
l_rules.append(DuplicationRule("C", "G", "E"))
l_rules.append(DuplicationRule("E", "G", "F"))
l_rules.append(DuplicationRule("F", "G", "G"))
l_rules.append(EndRule("G", "G"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_simple_ig_5(self):
# Write rules
l_rules = []
# Initialization rules
l_rules.append(ProductionRule("S", "A", "f"))
l_rules.append(ConsumptionRule("f", "A", "B"))
l_rules.append(ConsumptionRule("f", "C", "F"))
l_rules.append(ProductionRule("B", "C", "f"))
l_rules.append(ProductionRule("D", "E", "f"))
l_rules.append(EndRule("F", "epsilon"))
l_rules.append(DuplicationRule("B0", "A0", "C"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_removal_useless(self):
""" Tests the removal of useless symbols """
l_rules = []
l_rules.append(ProductionRule("S", "D", "f"))
l_rules.append(DuplicationRule("D", "A", "B"))
l_rules.append(ConsumptionRule("f", "A", "Afinal"))
l_rules.append(ConsumptionRule("f", "B", "Bfinal"))
l_rules.append(EndRule("Afinal", "a"))
l_rules.append(EndRule("Bfinal", "b"))
l_rules.append(ConsumptionRule("f", "A", "Q"))
l_rules.append(EndRule("R", "b"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules, start_variable="S")
i_grammar2 = i_grammar.remove_useless_rules()
self.assertFalse(i_grammar.is_empty())
self.assertEqual(i_grammar2.non_terminals,
i_grammar2.get_generating_non_terminals())
self.assertEqual(i_grammar2.non_terminals,
i_grammar2.get_reachable_non_terminals())
def test_simple_ig_regular_expression(self):
# Test for regular expression functions
l_rules = []
l_rules.append(ProductionRule("S", "Ci", "end"))
l_rules.append(ProductionRule("Ci", "C", "q"))
l_rules.append(ConsumptionRule("q", "C", "C0"))
l_rules.append(ProductionRule("C0", "C0", "a-"))
l_rules.append(DuplicationRule("C0", "T", "C"))
l_rules.append(EndRule("T", "epsilon"))
l_rules.append(ConsumptionRule("end", "C", "Cend"))
l_rules.append(EndRule("Cend", "epsilon"))
l_rules.append(ConsumptionRule("a-", "C", "C1"))
l_rules.append(ConsumptionRule("a-", "C1", "C2"))
l_rules.append(ConsumptionRule("a-", "C2", "C3"))
l_rules.append(ConsumptionRule("a-", "C3", "C4"))
l_rules.append(ConsumptionRule("a-", "C4", "C"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_simple_ig_3(self):
# Write rules
l_rules = []
# Initialization rules
l_rules.append(ProductionRule("S", "Cinit", "end"))
l_rules.append(ProductionRule("Cinit", "C", "b"))
l_rules.append(ConsumptionRule("end", "C", "T"))
l_rules.append(EndRule("T", "epsilon"))
# C[cm sigma] -> cm C[sigma]
l_rules.append(ConsumptionRule("cm", "C", "B0"))
l_rules.append(DuplicationRule("B0", "A0", "C"))
l_rules.append(EndRule("A0", "cm"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertTrue(i_grammar.is_empty())
def test_simple_ig9(self):
""" Tests 9 {a^n b^n c^n}"""
l_rules = []
l_rules.append(ProductionRule("S", "T", "g"))
l_rules.append(ProductionRule("T", "T", "f"))
l_rules.append(DuplicationRule("T", "AB", "C"))
l_rules.append(DuplicationRule("AB", "A", "B"))
l_rules.append(ConsumptionRule("f", "A", "A2"))
l_rules.append(ConsumptionRule("f", "B", "B2"))
l_rules.append(ConsumptionRule("f", "C", "C2"))
l_rules.append(DuplicationRule("A2", "Afinal", "A"))
l_rules.append(DuplicationRule("B2", "Bfinal", "B"))
l_rules.append(DuplicationRule("C2", "Cfinal", "C"))
l_rules.append(EndRule("Afinal", "a"))
l_rules.append(EndRule("Bfinal", "b"))
l_rules.append(EndRule("Cfinal", "c"))
l_rules.append(ConsumptionRule("g", "A", "Afinal"))
l_rules.append(ConsumptionRule("g", "B", "Bfinal"))
l_rules.append(ConsumptionRule("g", "C", "Cfinal"))
rules = Rules(l_rules)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
def test_simple_ig_0(self):
"""Test"""
# Write rules
l_rules = []
# Initialization rules
l_rules.append(ProductionRule("S", "Cinit", "end"))
l_rules.append(ProductionRule("Cinit", "C", "b"))
l_rules.append(ConsumptionRule("end", "C", "T"))
l_rules.append(EndRule("T", "epsilon"))
# C[cm sigma] -> cm C[sigma]
l_rules.append(ConsumptionRule("b", "C", "B0"))
l_rules.append(DuplicationRule("B0", "A0", "C"))
l_rules.append(EndRule("A0", "b"))
for i in range(9):
rules = Rules(l_rules, i)
i_grammar = IndexedGrammar(rules)
self.assertFalse(i_grammar.is_empty())
self.assertEqual(i_grammar.terminals, {"end", "b", "epsilon"})