Source code for monk.errors

# coding: utf-8
#    Monk is an unobtrusive data modeling, manipulation and validation library.
#    Copyright © 2011—2014  Andrey Mikhaylenko
#    This file is part of Monk.
#    Monk is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Lesser General Public License as published
#    by the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#    Monk is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    GNU Lesser General Public License for more details.
#    You should have received a copy of the GNU Lesser General Public License
#    along with Monk.  If not, see <>.
[docs]class ValidationError(Exception): """ Raised when a document or its part cannot pass validation. """
[docs]class StructureSpecificationError(ValidationError): """ Raised when malformed document structure is detected. """
[docs]class DictValueError(ValidationError): """ Raised when dictionary value fails validation. Used to detect nested errors in order to format the human-readable messages unambiguously. """
[docs]class MissingKeys(ValidationError): """ Raised when a required dictionary key is missing from the value dict. """ def __str__(self): keys_str = ', '.join(map(repr, self.args)) return 'must have keys: {keys}'.format(keys=keys_str)
[docs]class InvalidKeys(ValidationError): """ Raised whan the value dictionary contains an unexpected key. """ def __str__(self): keys_str = ', '.join(map(repr, self.args)) return 'must not have keys like {keys}'.format(keys=keys_str)
[docs]class CombinedValidationError(ValidationError): """ Raised when a combination of specs has failed validation. """ _error_string_separator = '; ' def _format_nested_error(self, e): # only display error class if it's not obvious if isinstance(e, str): tmpl = '{err}' elif isinstance(e, ValidationError): tmpl = '{err}' else: tmpl = '{cls}: {err}' return tmpl.format(cls=e.__class__.__name__, err=e) def __str__(self): err_strings = map(self._format_nested_error, self.args) return self._error_string_separator.join(err_strings)
[docs]class AllFailed(CombinedValidationError): """ Raised when at least one validator was expected to pass but none did. """ _error_string_separator = ' or '
[docs]class AtLeastOneFailed(CombinedValidationError): """ Raised when all validators were expected to pas but at least one didn't. """ _error_string_separator = ' and '
[docs]class NoDefaultValue(Exception): """ Raised when the validator could not produce a default value. """