def get_eqn(self, s, eqn):
try:
if s == 'Del':
if self.equation != '':
self.equation = list(self.equation)
del (self.equation[-1])
self.equation = ''.join(self.equation)
eqn.set(self.equation)
elif s == 'AC':
self.equation = ''
eqn.set(self.equation)
elif s == '(':
if self.equation == '' or self.equation[-1] in '+-(' or len(
self.equation) > 1 and self.equation[-2] in '+-/*':
self.equation += '('
eqn.set(self.equation)
elif len(self.equation
) > 1 and self.equation[-2] not in '+-/*' or len(
self.equation) == 1:
self.equation = '{} {}'.format(self.equation, '* (')
eqn.set(self.equation)
elif s == '=':
if '(' in self.equation:
if brackets.validate(self.equation):
self.equation = brackets.simplify(self.equation)
else:
raise ValueError
reverse_polish = rpolish.infix_to_post(self.equation)
ok = rpolish.postfix_solve(reverse_polish)
self.equation = ''
if 'No' in str(ok):
raise ValueError
eqn.set(ok)
elif s in '+-/*':
if len(self.equation) == 0 or len(
self.equation) > 2 and self.equation[-2] in '+-*/':
if s in '-+':
self.equation += s
else:
self.equation += " {} ".format(s)
eqn.set(self.equation)
else:
self.equation += s
eqn.set(self.equation)
except:
eqn.set('Error')
def test_two_interspersed_round_pairs(self):
s = "()" + self.open_multi + ")(" + self.close_multi + "()"
self.assertFalse(validate(s))
def test_many_matched_square_and_curly(self):
s = "()" + self.open_multi + "()" + self.close_multi + "()"
self.assertTrue(validate(s))
def test_many_matched_round_pairs_then_stray_open(self):
s = "" + self.open_round + self.close_round + "("
self.assertFalse(validate(s))
def test_many_unmatched_round_pairs(self):
s = self.open_round + ")" + self.close_round
self.assertFalse(validate(s))
def test_empty_string(self):
self.assertTrue(validate(""))
def test_many_matched_round_pairs(self):
s = self.open_round + "X" + self.close_round
self.assertTrue(validate(s))
def test_single_bracket(self):
self.assertFalse(validate("{"))
def test_switched_different_kinds(self):
self.assertFalse(validate("[}{]"))
def test_one_outward_pair(self):
self.assertFalse(validate(")()()()()()("))
def test_close_one_fewer_than_you_open(self):
self.assertFalse(validate("((((())))"))
def test_consecutive_brackets_of_different_kinds(self):
self.assertTrue(validate("{}()[]{}"))
def test_consecutive_brackets(self):
self.assertTrue(validate("()()()()()"))
def test_nested_brackets_of_different_kinds(self):
self.assertTrue(validate("{[()]}"))
def test_nested_brackets(self):
self.assertTrue(validate("(((())))"))
def test_completely_wrong(self):
s = "[[]" + self.open_round + "){{}}" + self.close_multi + "(][][])"
self.assertFalse(validate(s))
def test_single_pair(self):
self.assertTrue(validate("[]"))
def test_overlapping_different_kinds(self):
self.assertFalse(validate("({)}"))