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1from isoduration.parser.exceptions import EmptyDuration
2from isoduration.parser.parsing import parse_date_duration
3from isoduration.parser.util import is_period
4from isoduration.types import Duration
7def parse_duration(duration_str: str) -> Duration:
8 if len(duration_str) < 2:
9 raise EmptyDuration("No duration information provided")
11 beginning = 1
12 first = duration_str[beginning - 1]
14 sign = +1
16 if first == "+":
17 beginning += 1
18 if first == "-":
19 sign = -1
20 beginning += 1
22 prefix = duration_str[beginning - 1]
23 duration = duration_str[beginning:]
25 if not is_period(prefix):
26 raise EmptyDuration("No prefix provided")
28 return parse_date_duration(duration, sign)