| from isoduration.parser.exceptions import EmptyDuration | |
| from isoduration.parser.parsing import parse_date_duration | |
| from isoduration.parser.util import is_period | |
| from isoduration.types import Duration | |
| def parse_duration(duration_str: str) -> Duration: | |
| if len(duration_str) < 2: | |
| raise EmptyDuration("No duration information provided") | |
| beginning = 1 | |
| first = duration_str[beginning - 1] | |
| sign = +1 | |
| if first == "+": | |
| beginning += 1 | |
| if first == "-": | |
| sign = -1 | |
| beginning += 1 | |
| prefix = duration_str[beginning - 1] | |
| duration = duration_str[beginning:] | |
| if not is_period(prefix): | |
| raise EmptyDuration("No prefix provided") | |
| return parse_date_duration(duration, sign) | |