in visualizeConnectData/lambdas/modifyCTR/isodate/isoduration.py [0:0]
def parse_duration(datestring):
"""
Parses an ISO 8601 durations into datetime.timedelta or Duration objects.
If the ISO date string does not contain years or months, a timedelta
instance is returned, else a Duration instance is returned.
The following duration formats are supported:
-PnnW duration in weeks
-PnnYnnMnnDTnnHnnMnnS complete duration specification
-PYYYYMMDDThhmmss basic alternative complete date format
-PYYYY-MM-DDThh:mm:ss extended alternative complete date format
-PYYYYDDDThhmmss basic alternative ordinal date format
-PYYYY-DDDThh:mm:ss extended alternative ordinal date format
The '-' is optional.
Limitations: ISO standard defines some restrictions about where to use
fractional numbers and which component and format combinations are
allowed. This parser implementation ignores all those restrictions and
returns something when it is able to find all necessary components.
In detail:
it does not check, whether only the last component has fractions.
it allows weeks specified with all other combinations
The alternative format does not support durations with years, months or
days set to 0.
"""
if not isinstance(datestring, string_types):
raise TypeError("Expecting a string %r" % datestring)
match = ISO8601_PERIOD_REGEX.match(datestring)
if not match:
# try alternative format:
if datestring.startswith("P"):
durdt = parse_datetime(datestring[1:])
if durdt.year != 0 or durdt.month != 0:
# create Duration
ret = Duration(days=durdt.day, seconds=durdt.second,
microseconds=durdt.microsecond,
minutes=durdt.minute, hours=durdt.hour,
months=durdt.month, years=durdt.year)
else: # FIXME: currently not possible in alternative format
# create timedelta
ret = timedelta(days=durdt.day, seconds=durdt.second,
microseconds=durdt.microsecond,
minutes=durdt.minute, hours=durdt.hour)
return ret
raise ISO8601Error("Unable to parse duration string %r" % datestring)
groups = match.groupdict()
for key, val in groups.items():
if key not in ('separator', 'sign'):
if val is None:
groups[key] = "0n"
# print groups[key]
if key in ('years', 'months'):
groups[key] = Decimal(groups[key][:-1].replace(',', '.'))
else:
# these values are passed into a timedelta object,
# which works with floats.
groups[key] = float(groups[key][:-1].replace(',', '.'))
if groups["years"] == 0 and groups["months"] == 0:
ret = timedelta(days=groups["days"], hours=groups["hours"],
minutes=groups["minutes"], seconds=groups["seconds"],
weeks=groups["weeks"])
if groups["sign"] == '-':
ret = timedelta(0) - ret
else:
ret = Duration(years=groups["years"], months=groups["months"],
days=groups["days"], hours=groups["hours"],
minutes=groups["minutes"], seconds=groups["seconds"],
weeks=groups["weeks"])
if groups["sign"] == '-':
ret = Duration(0) - ret
return ret