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# -*- coding: utf-8 -*-
"""
pint.errors
~~~~~~~~~
Functions and classes related to unit definitions and conversions.
:copyright: 2016 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import (division, unicode_literals, print_function,
absolute_import)
from .compat import string_types
class DefinitionSyntaxError(ValueError):
"""Raised when a textual definition has a syntax error.
"""
def __init__(self, msg, filename=None, lineno=None):
super(DefinitionSyntaxError, self).__init__()
self.msg = msg
self.filename = None
self.lineno = None
def __str__(self):
mess = "While opening {}, in line {}: "
return mess.format(self.filename, self.lineno) + self.msg
class RedefinitionError(ValueError):
"""Raised when a unit or prefix is redefined.
"""
def __init__(self, name, definition_type):
super(RedefinitionError, self).__init__()
self.name = name
self.definition_type = definition_type
self.filename = None
self.lineno = None
def __str__(self):
msg = "cannot redefine '{}' ({})".format(self.name,
self.definition_type)
if self.filename:
mess = "While opening {}, in line {}: "
return mess.format(self.filename, self.lineno) + msg
return msg
class UndefinedUnitError(AttributeError):
"""Raised when the units are not defined in the unit registry.
"""
def __init__(self, unit_names):
super(UndefinedUnitError, self).__init__()
self.unit_names = unit_names
def __str__(self):
mess = "'{}' is not defined in the unit registry"
mess_plural = "'{}' are not defined in the unit registry"
if isinstance(self.unit_names, string_types):
return mess.format(self.unit_names)
elif isinstance(self.unit_names, (list, tuple))\
and len(self.unit_names) == 1:
return mess.format(self.unit_names[0])
elif isinstance(self.unit_names, set) and len(self.unit_names) == 1:
uname = list(self.unit_names)[0]
return mess.format(uname)
else:
return mess_plural.format(self.unit_names)
class DimensionalityError(ValueError):
"""Raised when trying to convert between incompatible units.
"""
def __init__(self, units1, units2, dim1=None, dim2=None, extra_msg=''):
super(DimensionalityError, self).__init__()
self.units1 = units1
self.units2 = units2
self.dim1 = dim1
self.dim2 = dim2
self.extra_msg = extra_msg
def __str__(self):
if self.dim1 or self.dim2:
dim1 = ' ({})'.format(self.dim1)
dim2 = ' ({})'.format(self.dim2)
else:
dim1 = ''
dim2 = ''
msg = "Cannot convert from '{}'{} to '{}'{}" + self.extra_msg
return msg.format(self.units1, dim1, self.units2, dim2)
class OffsetUnitCalculusError(ValueError):
"""Raised on ambiguous operations with offset units.
"""
def __init__(self, units1, units2='', extra_msg=''):
super(ValueError, self).__init__()
self.units1 = units1
self.units2 = units2
self.extra_msg = extra_msg
def __str__(self):
msg = ("Ambiguous operation with offset unit (%s)." %
', '.join(['%s' % u for u in [self.units1, self.units2] if u])
+ self.extra_msg)
return msg.format(self.units1, self.units2)
class UnitStrippedWarning(UserWarning):
pass
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