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import datetime
import pytz
from parsley import makeGrammar
# See www.ietf.org/rfc/rfc3339.txt
_iso_8601_definition = r"""
year = <digit{4}>:Y -> int(Y)
month = <digit{2}>:m -> int(m)
day = <digit{2}>:d -> int(d)
hour = <digit{2}>:H -> int(H)
minute = <digit{2}>:M -> int(M)
second = <digit{2}>:S -> int(S)
fraction = '.' <digit+>:frac -> int(float('0.' + frac) * 10 ** 6)
sign = ('-' -> -1) | ('+' -> 1)
numeric_offset = sign:s hour:h ':' minute:m -> FixedOffset(s * (h * 60 + m))
utc = 'Z' -> UTC
offset = utc | numeric_offset
naive_time = hour:h ':' minute:m ':' second:s (fraction | -> 0):ms
-> time(h, m, s, ms)
time = naive_time:t offset:o -> t.replace(tzinfo=o)
date = year:y '-' month:m '-' day:d -> date(y, m, d)
datetime = date:d 'T' time:t -> datetime.combine(d, t)
"""
DateTimeParser = makeGrammar(
_iso_8601_definition,
{
'FixedOffset': pytz.FixedOffset,
'date': datetime.date,
'time': datetime.time,
'datetime': datetime.datetime,
'UTC': pytz.UTC,
},
)
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