def _parse_duration_prescribed(durationstr, builder):
# durationstr can be of the form PnYnMnDTnHnMnS or PnW
# Don't allow negative elements
# https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find("-") != -1:
raise NegativeDurationError("ISO 8601 durations must be positive.")
# Make sure the end character is valid
# https://bitbucket.org/nielsenb/aniso8601/issues/9/durations-with-trailing-garbage-are-parsed
if durationstr[-1] not in ["Y", "M", "D", "H", "S", "W"]:
raise ISOFormatError("ISO 8601 duration must end with a valid " "character.")
# Make sure only the lowest order element has decimal precision
separator_index = find_separator(durationstr)
if separator_index != -1:
remaining = durationstr[separator_index + 1 :]
if find_separator(remaining) != -1:
raise ISOFormatError(
"ISO 8601 allows only lowest order element to "
"have a decimal fraction."
)
# There should only ever be 1 letter after a decimal if there is more
# then one, the string is invalid
lettercount = 0
for character in remaining:
if character.isalpha() is True:
lettercount += 1
if lettercount > 1:
raise ISOFormatError(
"ISO 8601 duration must end with " "a single valid character."
)
# Do not allow W in combination with other designators
# https://bitbucket.org/nielsenb/aniso8601/issues/2/week-designators-should-not-be-combinable
if (
durationstr.find("W") != -1
and _has_any_component(durationstr, ["Y", "M", "D", "H", "S"]) is True
):
raise ISOFormatError(
"ISO 8601 week designators may not be combined "
"with other time designators."
)
# Parse the elements of the duration
if durationstr.find("T") == -1:
return _parse_duration_prescribed_notime(durationstr, builder)
return _parse_duration_prescribed_time(durationstr, builder)
def _parse_duration_prescribed_notime(durationstr, builder):
# durationstr can be of the form PnYnMnD or PnW
# Don't allow negative elements
# https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find('-') != -1:
raise NegativeDurationError('ISO 8601 durations must be positive.')
# Make sure no time portion is included
# https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(durationstr, ['H', 'S']):
raise ISOFormatError(
'ISO 8601 time components not allowed in duration '
'without prescribed time.')
if _component_order_correct(durationstr,
['P', 'Y', 'M', 'D', 'W']) is False:
raise ISOFormatError('ISO 8601 duration components must be in the '
'correct order.')
if durationstr.find('Y') != -1:
yearstr = _parse_duration_element(durationstr, 'Y')
else:
yearstr = None
if durationstr.find('M') != -1:
monthstr = _parse_duration_element(durationstr, 'M')
else:
monthstr = None
if durationstr.find('W') != -1:
weekstr = _parse_duration_element(durationstr, 'W')
else:
weekstr = None
if durationstr.find('D') != -1:
daystr = _parse_duration_element(durationstr, 'D')
else:
daystr = None
return builder.build_duration(PnY=yearstr,
PnM=monthstr,
PnW=weekstr,
PnD=daystr)
def _parse_duration_prescribed_notime(durationstr, builder):
# durationstr can be of the form PnYnMnD or PnW
# Don't allow negative elements
# https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find("-") != -1:
raise NegativeDurationError("ISO 8601 durations must be positive.")
# Make sure no time portion is included
# https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(durationstr, ["H", "S"]):
raise ISOFormatError(
"ISO 8601 time components not allowed in duration "
"without prescribed time.")
if _component_order_correct(durationstr,
["P", "Y", "M", "D", "W"]) is False:
raise ISOFormatError("ISO 8601 duration components must be in the "
"correct order.")
if durationstr.find("Y") != -1:
yearstr = _parse_duration_element(durationstr, "Y")
else:
yearstr = None
if durationstr.find("M") != -1:
monthstr = _parse_duration_element(durationstr, "M")
else:
monthstr = None
if durationstr.find("W") != -1:
weekstr = _parse_duration_element(durationstr, "W")
else:
weekstr = None
if durationstr.find("D") != -1:
daystr = _parse_duration_element(durationstr, "D")
else:
daystr = None
return builder.build_duration(PnY=yearstr,
PnM=monthstr,
PnW=weekstr,
PnD=daystr)
def _parse_duration_prescribed(durationstr, builder):
#durationstr can be of the form PnYnMnDTnHnMnS or PnW
#Don't allow negative elements
#https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find('-') != -1:
raise NegativeDurationError('ISO 8601 durations must be positive.')
#Make sure the end character is valid
#https://bitbucket.org/nielsenb/aniso8601/issues/9/durations-with-trailing-garbage-are-parsed
if durationstr[-1] not in ['Y', 'M', 'D', 'H', 'S', 'W']:
raise ISOFormatError('ISO 8601 duration must end with a valid '
'character.')
#Make sure only the lowest order element has decimal precision
if durationstr.count('.') > 1:
raise ISOFormatError('ISO 8601 allows only lowest order element to '
'have a decimal fraction.')
elif durationstr.count('.') == 1:
#There should only ever be 1 letter after a decimal if there is more
#then one, the string is invalid
lettercount = 0
for character in durationstr.split('.')[1]:
if character.isalpha() is True:
lettercount += 1
if lettercount > 1:
raise ISOFormatError('ISO 8601 duration must end with '
'a single valid character.')
#Do not allow W in combination with other designators
#https://bitbucket.org/nielsenb/aniso8601/issues/2/week-designators-should-not-be-combinable
if (durationstr.find('W') != -1 and _has_any_component(
durationstr, ['Y', 'M', 'D', 'H', 'S']) is True):
raise ISOFormatError('ISO 8601 week designators may not be combined '
'with other time designators.')
#Parse the elements of the duration
if durationstr.find('T') == -1:
return _parse_duration_prescribed_notime(durationstr, builder)
return _parse_duration_prescribed_time(durationstr, builder)
def _parse_duration_prescribed_time(durationstr, builder):
# durationstr can be of the form PnYnMnDTnHnMnS
# Don't allow negative elements
# https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find('-') != -1:
raise NegativeDurationError('ISO 8601 durations must be positive.')
firsthalf = durationstr[:durationstr.find('T')]
secondhalf = durationstr[durationstr.find('T'):]
# Make sure no time portion is included in the date half
# https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(firsthalf, ['H', 'S']):
raise ISOFormatError('ISO 8601 time components not allowed in date '
'portion of duration.')
if _component_order_correct(firsthalf, ['P', 'Y', 'M', 'D', 'W']) is False:
raise ISOFormatError('ISO 8601 duration components must be in the '
'correct order.')
# Make sure no date component is included in the time half
if _has_any_component(secondhalf, ['Y', 'D']):
raise ISOFormatError('ISO 8601 time components not allowed in date '
'portion of duration.')
if _component_order_correct(secondhalf, ['T', 'H', 'M', 'S']) is False:
raise ISOFormatError('ISO 8601 time components in duration must be in '
'the correct order.')
if firsthalf.find('Y') != -1:
yearstr = _parse_duration_element(firsthalf, 'Y')
else:
yearstr = None
if firsthalf.find('M') != -1:
monthstr = _parse_duration_element(firsthalf, 'M')
else:
monthstr = None
if firsthalf.find('D') != -1:
daystr = _parse_duration_element(firsthalf, 'D')
else:
daystr = None
if secondhalf.find('H') != -1:
hourstr = _parse_duration_element(secondhalf, 'H')
else:
hourstr = None
if secondhalf.find('M') != -1:
minutestr = _parse_duration_element(secondhalf, 'M')
else:
minutestr = None
if secondhalf.find('S') != -1:
secondstr = _parse_duration_element(secondhalf, 'S')
else:
secondstr = None
return builder.build_duration(PnY=yearstr,
PnM=monthstr,
PnD=daystr,
TnH=hourstr,
TnM=minutestr,
TnS=secondstr)
def _parse_duration_prescribed_time(durationstr, builder):
# durationstr can be of the form PnYnMnDTnHnMnS
# Don't allow negative elements
# https://bitbucket.org/nielsenb/aniso8601/issues/20/negative-duration
if durationstr.find("-") != -1:
raise NegativeDurationError("ISO 8601 durations must be positive.")
firsthalf = durationstr[: durationstr.find("T")]
secondhalf = durationstr[durationstr.find("T") :]
# Make sure no time portion is included in the date half
# https://bitbucket.org/nielsenb/aniso8601/issues/7/durations-with-time-components-before-t
if _has_any_component(firsthalf, ["H", "S"]):
raise ISOFormatError(
"ISO 8601 time components not allowed in date " "portion of duration."
)
if _component_order_correct(firsthalf, ["P", "Y", "M", "D", "W"]) is False:
raise ISOFormatError(
"ISO 8601 duration components must be in the " "correct order."
)
# Make sure no date component is included in the time half
if _has_any_component(secondhalf, ["Y", "D"]):
raise ISOFormatError(
"ISO 8601 time components not allowed in date " "portion of duration."
)
if _component_order_correct(secondhalf, ["T", "H", "M", "S"]) is False:
raise ISOFormatError(
"ISO 8601 time components in duration must be in " "the correct order."
)
if firsthalf.find("Y") != -1:
yearstr = _parse_duration_element(firsthalf, "Y")
else:
yearstr = None
if firsthalf.find("M") != -1:
monthstr = _parse_duration_element(firsthalf, "M")
else:
monthstr = None
if firsthalf.find("D") != -1:
daystr = _parse_duration_element(firsthalf, "D")
else:
daystr = None
if secondhalf.find("H") != -1:
hourstr = _parse_duration_element(secondhalf, "H")
else:
hourstr = None
if secondhalf.find("M") != -1:
minutestr = _parse_duration_element(secondhalf, "M")
else:
minutestr = None
if secondhalf.find("S") != -1:
secondstr = _parse_duration_element(secondhalf, "S")
else:
secondstr = None
return builder.build_duration(
PnY=yearstr, PnM=monthstr, PnD=daystr, TnH=hourstr, TnM=minutestr, TnS=secondstr
)