diff options
Diffstat (limited to 'backend/hist_data')
| -rw-r--r-- | backend/hist_data/cal.py | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/backend/hist_data/cal.py b/backend/hist_data/cal.py index d86589b..64bc5a4 100644 --- a/backend/hist_data/cal.py +++ b/backend/hist_data/cal.py @@ -79,6 +79,19 @@ MIN_CAL_YEAR = -4713 # Year before which JDNs are not usable MONTH_SCALE = -1; DAY_SCALE = -2; SCALES: list[int] = [int(s) for s in [1e9, 1e8, 1e7, 1e6, 1e5, 1e4, 1e3, 100, 10, 1, MONTH_SCALE, DAY_SCALE]]; + # The timeline is divided into units of SCALES[0], then SCALES[1], etc + # Positive ints represent numbers of years, -1 represents 1 month, -2 represents 1 day + +if __debug__: # Validate SCALES + if SCALES[-1] != DAY_SCALE or SCALES[-2] != MONTH_SCALE or SCALES[-3] != 1: + raise Exception('SCALES must end with [1, MONTH_SCALE, DAY_SCALE]'); + for i in range(1, len(SCALES) - 2): + if SCALES[i] <= 0: + raise Exception('SCALES must only have positive ints before MONTH_SCALE') + if SCALES[i-1] <= SCALES[i]: + raise Exception('SCALES must hold decreasing values') + if SCALES[i-1] % SCALES[i] > 0: + raise Exception('Each positive int in SCALES must divide the previous int') class HistDate: """ @@ -90,6 +103,7 @@ class HistDate: - False: Indicates a Julian calendar date - None: 'month' and 'day' are 1 (required for dates before MIN_CAL_YEAR) """ + # Note: Intentionally not enforcing, for gcal=None, that year < MIN_CAL_YEAR def __init__(self, gcal: bool | None, year: int, month=1, day=1): self.gcal = gcal self.year = year |