37 lines
819 B
Python
37 lines
819 B
Python
import re
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from typing import Dict
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from isoduration.constants import PERIOD_PREFIX, TIME_PREFIX, WEEK_PREFIX
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from isoduration.parser.exceptions import OutOfDesignators
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def is_period(ch: str) -> bool:
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return ch == PERIOD_PREFIX
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def is_time(ch: str) -> bool:
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return ch == TIME_PREFIX
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def is_week(ch: str) -> bool:
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return ch == WEEK_PREFIX
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def is_number(ch: str) -> bool:
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return bool(re.match(r"[+\-0-9.,eE]", ch))
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def is_letter(ch: str) -> bool:
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return ch.isalpha() and ch.lower() != "e"
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def parse_designator(designators: Dict[str, str], target: str) -> str:
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while True:
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try:
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key, value = designators.popitem(last=False) # type: ignore
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except KeyError as exc:
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raise OutOfDesignators from exc
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if key == target:
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return value
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