def test_extra_operations(self):
expressions = [
"5 + 3 * 8 *",
"5 + 3 * 8 * * *",
"5 + 3 * * * 8",
" / 5 + 3 * 8",
]
for exp in expressions:
with self.assertRaises(RuntimeError) as cm:
rpn.evaluate(exp)
self.assertIn('mismatched operators', str(cm.exception))
def calculate():
d = request.get_json(force=True)
if not isinstance(d, dict):
# Throw an error
# "The given data is not a dict!"
resp = app.response_class(
response=json.dumps({
'status': 400,
'message': "The given data is not a dict!"
}),
status=400,
)
return resp
if 'expression' not in d:
# Throw an error
# "The key 'expression' required'
resp = app.response_class(
response=json.dumps({
'status': 400,
'message': "The key 'expression' required"
}),
status=400,
)
return resp
expression = d.get('expression')
if not isinstance(expression, str):
resp = app.response_class(
response=json.dumps({
'status': 400,
'message': "The given data is not a string!"
}),
status=400,
)
return resp
try:
res = rpn.evaluate(expression)
except Exception as e:
resp = app.response_class(
response=json.dumps({
'status': 400,
'message': str(e)
}),
status=400,
)
return resp
return json.dumps({"result": res})
def calc_form():
error = None
res = None
if request.method == 'POST':
d = request.form
mathexpression = d.get('expression')
if not isinstance(mathexpression, str):
error = "The given data is not a string!"
elif len(mathexpression) == 0:
error = "The given data is empty!"
try:
res = rpn.evaluate(mathexpression)
except Exception as e:
error = str(e)
# следущий код выполняется при методе запроса GET
# или при признании полномочий недействительными
return flask.render_template('index.html', error=error, res=res)
def test_extra_closed_brackets(self):
expressions = ["(1 + (5 + 3))) * 8", "(2 + 10))", "2 + 5)"]
for exp in expressions:
with self.assertRaises(RuntimeError) as cm:
rpn.evaluate(exp)
self.assertIn('mismatched brackets', str(cm.exception))