113 lines
3.7 KiB
Python
113 lines
3.7 KiB
Python
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# Copyright 2017 The Abseil Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Exception classes in ABSL flags library.
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Do NOT import this module directly. Import the flags package and use the
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aliases defined at the package level instead.
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"""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import sys
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from absl.flags import _helpers
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_helpers.disclaim_module_ids.add(id(sys.modules[__name__]))
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class Error(Exception):
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"""The base class for all flags errors."""
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class CantOpenFlagFileError(Error):
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"""Raised when flagfile fails to open.
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E.g. the file doesn't exist, or has wrong permissions.
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"""
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class DuplicateFlagError(Error):
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"""Raised if there is a flag naming conflict."""
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@classmethod
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def from_flag(cls, flagname, flag_values, other_flag_values=None):
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"""Creates a DuplicateFlagError by providing flag name and values.
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Args:
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flagname: str, the name of the flag being redefined.
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flag_values: FlagValues, the FlagValues instance containing the first
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definition of flagname.
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other_flag_values: FlagValues, if it is not None, it should be the
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FlagValues object where the second definition of flagname occurs.
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If it is None, we assume that we're being called when attempting
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to create the flag a second time, and we use the module calling
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this one as the source of the second definition.
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Returns:
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An instance of DuplicateFlagError.
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"""
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first_module = flag_values.find_module_defining_flag(
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flagname, default='<unknown>')
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if other_flag_values is None:
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second_module = _helpers.get_calling_module()
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else:
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second_module = other_flag_values.find_module_defining_flag(
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flagname, default='<unknown>')
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flag_summary = flag_values[flagname].help
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msg = ("The flag '%s' is defined twice. First from %s, Second from %s. "
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"Description from first occurrence: %s") % (
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flagname, first_module, second_module, flag_summary)
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return cls(msg)
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class IllegalFlagValueError(Error):
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"""Raised when the flag command line argument is illegal."""
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class UnrecognizedFlagError(Error):
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"""Raised when a flag is unrecognized.
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Attributes:
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flagname: str, the name of the unrecognized flag.
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flagvalue: The value of the flag, empty if the flag is not defined.
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"""
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def __init__(self, flagname, flagvalue='', suggestions=None):
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self.flagname = flagname
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self.flagvalue = flagvalue
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if suggestions:
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# Space before the question mark is intentional to not include it in the
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# selection when copy-pasting the suggestion from (some) terminals.
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tip = '. Did you mean: %s ?' % ', '.join(suggestions)
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else:
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tip = ''
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super(UnrecognizedFlagError, self).__init__(
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'Unknown command line flag \'%s\'%s' % (flagname, tip))
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class UnparsedFlagAccessError(Error):
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"""Raised when accessing the flag value from unparsed FlagValues."""
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class ValidationError(Error):
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"""Raised when flag validator constraint is not satisfied."""
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class FlagNameConflictsWithMethodError(Error):
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"""Raised when a flag name conflicts with FlagValues methods."""
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