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# -*- coding: utf-8 -*-
# Copyright (c) 2021, Brandon Nielsen
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
from aniso8601.builders.python import PythonTimeBuilder
from aniso8601.compat import is_string
from aniso8601.exceptions import ISOFormatError
def parse_timezone(tzstr, builder=PythonTimeBuilder):
# tzstr can be Z, ±hh:mm, ±hhmm, ±hh
if is_string(tzstr) is False:
raise ValueError("Time zone must be string.")
if len(tzstr) == 1 and tzstr[0] == "Z":
return builder.build_timezone(negative=False, Z=True, name=tzstr)
elif len(tzstr) == 6:
# ±hh:mm
hourstr = tzstr[1:3]
minutestr = tzstr[4:6]
if tzstr[0] == "-" and hourstr == "00" and minutestr == "00":
raise ISOFormatError("Negative ISO 8601 time offset must not " "be 0.")
elif len(tzstr) == 5:
# ±hhmm
hourstr = tzstr[1:3]
minutestr = tzstr[3:5]
if tzstr[0] == "-" and hourstr == "00" and minutestr == "00":
raise ISOFormatError("Negative ISO 8601 time offset must not " "be 0.")
elif len(tzstr) == 3:
# ±hh
hourstr = tzstr[1:3]
minutestr = None
if tzstr[0] == "-" and hourstr == "00":
raise ISOFormatError("Negative ISO 8601 time offset must not " "be 0.")
else:
raise ISOFormatError('"{0}" is not a valid ISO 8601 time offset.'.format(tzstr))
for componentstr in [hourstr, minutestr]:
if componentstr is not None:
if componentstr.isdigit() is False:
raise ISOFormatError(
'"{0}" is not a valid ISO 8601 time offset.'.format(tzstr)
)
if tzstr[0] == "+":
return builder.build_timezone(
negative=False, hh=hourstr, mm=minutestr, name=tzstr
)
if tzstr[0] == "-":
return builder.build_timezone(
negative=True, hh=hourstr, mm=minutestr, name=tzstr
)
raise ISOFormatError('"{0}" is not a valid ISO 8601 time offset.'.format(tzstr))
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