def test_five_rules(self):
rgen = raw_rule_generator("q4 0 -> P1 R q3\n"
" 1 -> Px q4\n\n"
" x -> P0 L\n\n\n"
" P1 q3\n"
"q3 0 -> P1 q4\n"
" 1 -> P0 L q3")
assert next(rgen) == (["q4", "0"], ["P1", "R", "q3"])
assert next(rgen) == ([" ", "1"], ["Px", "q4"])
assert next(rgen) == ([" ", "x"], ["P0", "L", "P1", "q3"])
assert next(rgen) == (["q3", "0"], ["P1", "q4"])
assert next(rgen) == ([" ", "1"], ["P0", "L", "q3"])
with raises(StopIteration):
next(rgen)
def test_five_rules(self):
rgen = raw_rule_generator(
"q4 0 -> P1 R q3\n"
" 1 -> Px q4\n\n"
" x -> P0 L\n\n\n"
" P1 q3\n"
"q3 0 -> P1 q4\n"
" 1 -> P0 L q3"
)
assert next(rgen) == (["q4", "0"], ["P1", "R", "q3"])
assert next(rgen) == ([" ", "1"], ["Px", "q4"])
assert next(rgen) == ([" ", "x"], ["P0", "L", "P1", "q3"])
assert next(rgen) == (["q3", "0"], ["P1", "q4"])
assert next(rgen) == ([" ", "1"], ["P0", "L", "q3"])
with raises(StopIteration):
next(rgen)
def test_one_rule(self):
rgen = raw_rule_generator("q1 1 -> P0 R q2")
assert next(rgen) == (["q1", "1"], ["P0", "R", "q2"])
with raises(StopIteration):
next(rgen)
def test_no_rules(self):
assert list(raw_rule_generator("\n \n\n")) == [] == \
list(raw_rule_generator(""))
def test_one_and_a_arrow_only_rule(self, rule):
rgen = raw_rule_generator("q1 1 -> E q0\n" + rule)
assert next(rgen) == (["q1", "1"], ["E", "q0"])
with raises(TMSyntaxError):
next(rgen)
def test_one_and_a_half_rule_with_arrow(self, rule):
rgen = raw_rule_generator("q0 -> q1\n" + rule)
assert next(rgen) == (["q0"], ["q1"])
with raises(TMSyntaxError):
next(rgen)
def test_half_rule(self):
rgen = raw_rule_generator("q1 1")
with raises(TMSyntaxError):
next(rgen)
def test_one_and_a_arrow_only_rule(self, rule):
rgen = raw_rule_generator("q1 1 -> E q0\n" + rule)
assert next(rgen) == (["q1", "1"], ["E", "q0"])
with raises(TMSyntaxError):
next(rgen)
def test_one_and_a_half_rule_with_arrow(self, rule):
rgen = raw_rule_generator("q0 -> q1\n" + rule)
assert next(rgen) == (["q0"], ["q1"])
with raises(TMSyntaxError):
next(rgen)
def test_half_rule(self):
rgen = raw_rule_generator("q1 1")
with raises(TMSyntaxError):
next(rgen)
def test_one_rule(self):
rgen = raw_rule_generator("q1 1 -> P0 R q2")
assert next(rgen) == (["q1", "1"], ["P0", "R", "q2"])
with raises(StopIteration):
next(rgen)
def test_no_rules(self):
assert list(raw_rule_generator("\n \n\n")) == [] == \
list(raw_rule_generator(""))