def build_list_from_user_input(repo, user_input):
"""
Creates a new measure from a user inputted line
:type repo: ConvertRepo
:type user_input: str
:rtype: list[ConvertMeasure]
"""
user_input = user_input.strip()
# Search through the line for digits, pull them amount as a preliminary amount and strip the rest of the line.
# TODO: add calculation?
preliminary_amount_str = Commons.get_digits_from_start_or_end(
user_input)
if preliminary_amount_str is None:
raise ConvertException("Cannot find amount.")
preliminary_amount_value = float(preliminary_amount_str)
# Remove amountString from userInput
if user_input.startswith(preliminary_amount_str):
user_input = user_input[len(preliminary_amount_str):]
else:
user_input = user_input[:-len(preliminary_amount_str)]
# Loop all units, see which might match userInput with prefixes. Building a list of valid measures for input.
new_measure_list = []
for unit_obj in repo.get_full_unit_list():
prefix_obj = unit_obj.get_prefix_from_user_input(user_input)
if prefix_obj is False:
continue
prefix_multiplier = 1
if prefix_obj is not None:
prefix_multiplier = prefix_obj.multiplier
new_amount = preliminary_amount_value * prefix_multiplier
new_measure = ConvertMeasure(new_amount, unit_obj)
new_measure_list.append(new_measure)
# If list is still empty, throw an exception.
if len(new_measure_list) == 0:
raise ConvertException("Unrecognised unit.")
# Return list of matching measures.
return new_measure_list
def test_get_digits_from_start_or_end(string, digits):
assert Commons.get_digits_from_start_or_end(string) == digits
