557 lines
19 KiB
Python
557 lines
19 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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"""Contains Flag class - information about single command-line flag.
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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 collections import abc
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import copy
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import enum
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import functools
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from typing import Any, Dict, Generic, Iterable, List, Optional, Text, Type, TypeVar, Union
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from xml.dom import minidom
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from absl.flags import _argument_parser
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from absl.flags import _exceptions
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from absl.flags import _helpers
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_T = TypeVar('_T')
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_ET = TypeVar('_ET', bound=enum.Enum)
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@functools.total_ordering
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class Flag(Generic[_T]):
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"""Information about a command-line flag.
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Attributes:
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name: the name for this flag
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default: the default value for this flag
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default_unparsed: the unparsed default value for this flag.
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default_as_str: default value as repr'd string, e.g., "'true'"
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(or None)
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value: the most recent parsed value of this flag set by :meth:`parse`
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help: a help string or None if no help is available
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short_name: the single letter alias for this flag (or None)
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boolean: if 'true', this flag does not accept arguments
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present: true if this flag was parsed from command line flags
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parser: an :class:`~absl.flags.ArgumentParser` object
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serializer: an ArgumentSerializer object
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allow_override: the flag may be redefined without raising an error,
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and newly defined flag overrides the old one.
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allow_override_cpp: use the flag from C++ if available the flag
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definition is replaced by the C++ flag after init
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allow_hide_cpp: use the Python flag despite having a C++ flag with
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the same name (ignore the C++ flag)
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using_default_value: the flag value has not been set by user
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allow_overwrite: the flag may be parsed more than once without
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raising an error, the last set value will be used
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allow_using_method_names: whether this flag can be defined even if
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it has a name that conflicts with a FlagValues method.
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validators: list of the flag validators.
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The only public method of a ``Flag`` object is :meth:`parse`, but it is
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typically only called by a :class:`~absl.flags.FlagValues` object. The
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:meth:`parse` method is a thin wrapper around the
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:meth:`ArgumentParser.parse()<absl.flags.ArgumentParser.parse>` method. The
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parsed value is saved in ``.value``, and the ``.present`` attribute is
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updated. If this flag was already present, an Error is raised.
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:meth:`parse` is also called during ``__init__`` to parse the default value
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and initialize the ``.value`` attribute. This enables other python modules to
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safely use flags even if the ``__main__`` module neglects to parse the
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command line arguments. The ``.present`` attribute is cleared after
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``__init__`` parsing. If the default value is set to ``None``, then the
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``__init__`` parsing step is skipped and the ``.value`` attribute is
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initialized to None.
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Note: The default value is also presented to the user in the help
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string, so it is important that it be a legal value for this flag.
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"""
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# NOTE: pytype doesn't find defaults without this.
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default: Optional[_T]
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default_as_str: Optional[Text]
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default_unparsed: Union[Optional[_T], Text]
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def __init__(
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self,
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parser: _argument_parser.ArgumentParser[_T],
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serializer: Optional[_argument_parser.ArgumentSerializer[_T]],
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name: Text,
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default: Union[Optional[_T], Text],
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help_string: Optional[Text],
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short_name: Optional[Text] = None,
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boolean: bool = False,
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allow_override: bool = False,
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allow_override_cpp: bool = False,
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allow_hide_cpp: bool = False,
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allow_overwrite: bool = True,
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allow_using_method_names: bool = False,
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) -> None:
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self.name = name
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if not help_string:
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help_string = '(no help available)'
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self.help = help_string
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self.short_name = short_name
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self.boolean = boolean
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self.present = 0
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self.parser = parser
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self.serializer = serializer
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self.allow_override = allow_override
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self.allow_override_cpp = allow_override_cpp
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self.allow_hide_cpp = allow_hide_cpp
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self.allow_overwrite = allow_overwrite
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self.allow_using_method_names = allow_using_method_names
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self.using_default_value = True
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self._value = None
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self.validators = []
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if self.allow_hide_cpp and self.allow_override_cpp:
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raise _exceptions.Error(
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"Can't have both allow_hide_cpp (means use Python flag) and "
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'allow_override_cpp (means use C++ flag after InitGoogle)')
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self._set_default(default)
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@property
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def value(self) -> Optional[_T]:
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return self._value
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@value.setter
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def value(self, value: Optional[_T]):
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self._value = value
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def __hash__(self):
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return hash(id(self))
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def __eq__(self, other):
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return self is other
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def __lt__(self, other):
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if isinstance(other, Flag):
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return id(self) < id(other)
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return NotImplemented
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def __bool__(self):
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raise TypeError('A Flag instance would always be True. '
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'Did you mean to test the `.value` attribute?')
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def __getstate__(self):
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raise TypeError("can't pickle Flag objects")
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def __copy__(self):
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raise TypeError('%s does not support shallow copies. '
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'Use copy.deepcopy instead.' % type(self).__name__)
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def __deepcopy__(self, memo: Dict[int, Any]) -> 'Flag[_T]':
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result = object.__new__(type(self))
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result.__dict__ = copy.deepcopy(self.__dict__, memo)
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return result
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def _get_parsed_value_as_string(self, value: Optional[_T]) -> Optional[Text]:
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"""Returns parsed flag value as string."""
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if value is None:
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return None
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if self.serializer:
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return repr(self.serializer.serialize(value))
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if self.boolean:
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if value:
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return repr('true')
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else:
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return repr('false')
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return repr(str(value))
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def parse(self, argument: Union[Text, Optional[_T]]) -> None:
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"""Parses string and sets flag value.
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Args:
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argument: str or the correct flag value type, argument to be parsed.
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"""
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if self.present and not self.allow_overwrite:
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raise _exceptions.IllegalFlagValueError(
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'flag --%s=%s: already defined as %s' % (
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self.name, argument, self.value))
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self.value = self._parse(argument)
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self.present += 1
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def _parse(self, argument: Union[Text, _T]) -> Optional[_T]:
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"""Internal parse function.
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It returns the parsed value, and does not modify class states.
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Args:
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argument: str or the correct flag value type, argument to be parsed.
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Returns:
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The parsed value.
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"""
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try:
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return self.parser.parse(argument)
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except (TypeError, ValueError) as e: # Recast as IllegalFlagValueError.
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raise _exceptions.IllegalFlagValueError(
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'flag --%s=%s: %s' % (self.name, argument, e))
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def unparse(self) -> None:
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self.value = self.default
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self.using_default_value = True
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self.present = 0
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def serialize(self) -> Text:
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"""Serializes the flag."""
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return self._serialize(self.value)
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def _serialize(self, value: Optional[_T]) -> Text:
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"""Internal serialize function."""
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if value is None:
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return ''
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if self.boolean:
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if value:
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return '--%s' % self.name
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else:
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return '--no%s' % self.name
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else:
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if not self.serializer:
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raise _exceptions.Error(
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'Serializer not present for flag %s' % self.name)
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return '--%s=%s' % (self.name, self.serializer.serialize(value))
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def _set_default(self, value: Union[Optional[_T], Text]) -> None:
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"""Changes the default value (and current value too) for this Flag."""
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self.default_unparsed = value
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if value is None:
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self.default = None
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else:
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self.default = self._parse_from_default(value)
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self.default_as_str = self._get_parsed_value_as_string(self.default)
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if self.using_default_value:
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self.value = self.default
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# This is split out so that aliases can skip regular parsing of the default
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# value.
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def _parse_from_default(self, value: Union[Text, _T]) -> Optional[_T]:
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return self._parse(value)
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def flag_type(self) -> Text:
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"""Returns a str that describes the type of the flag.
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NOTE: we use strings, and not the types.*Type constants because
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our flags can have more exotic types, e.g., 'comma separated list
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of strings', 'whitespace separated list of strings', etc.
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"""
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return self.parser.flag_type()
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def _create_xml_dom_element(
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self, doc: minidom.Document, module_name: str, is_key: bool = False
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) -> minidom.Element:
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"""Returns an XML element that contains this flag's information.
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This is information that is relevant to all flags (e.g., name,
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meaning, etc.). If you defined a flag that has some other pieces of
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info, then please override _ExtraXMLInfo.
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Please do NOT override this method.
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Args:
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doc: minidom.Document, the DOM document it should create nodes from.
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module_name: str,, the name of the module that defines this flag.
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is_key: boolean, True iff this flag is key for main module.
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Returns:
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A minidom.Element instance.
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"""
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element = doc.createElement('flag')
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if is_key:
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element.appendChild(_helpers.create_xml_dom_element(doc, 'key', 'yes'))
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'file', module_name))
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# Adds flag features that are relevant for all flags.
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element.appendChild(_helpers.create_xml_dom_element(doc, 'name', self.name))
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if self.short_name:
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'short_name', self.short_name))
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if self.help:
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'meaning', self.help))
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# The default flag value can either be represented as a string like on the
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# command line, or as a Python object. We serialize this value in the
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# latter case in order to remain consistent.
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if self.serializer and not isinstance(self.default, str):
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if self.default is not None:
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default_serialized = self.serializer.serialize(self.default)
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else:
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default_serialized = ''
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else:
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default_serialized = self.default
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'default', default_serialized))
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value_serialized = self._serialize_value_for_xml(self.value)
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'current', value_serialized))
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element.appendChild(_helpers.create_xml_dom_element(
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doc, 'type', self.flag_type()))
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# Adds extra flag features this flag may have.
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for e in self._extra_xml_dom_elements(doc):
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element.appendChild(e)
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return element
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def _serialize_value_for_xml(self, value: Optional[_T]) -> Any:
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"""Returns the serialized value, for use in an XML help text."""
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return value
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def _extra_xml_dom_elements(
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self, doc: minidom.Document
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) -> List[minidom.Element]:
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"""Returns extra info about this flag in XML.
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"Extra" means "not already included by _create_xml_dom_element above."
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Args:
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doc: minidom.Document, the DOM document it should create nodes from.
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Returns:
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A list of minidom.Element.
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"""
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# Usually, the parser knows the extra details about the flag, so
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# we just forward the call to it.
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return self.parser._custom_xml_dom_elements(doc) # pylint: disable=protected-access
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class BooleanFlag(Flag[bool]):
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"""Basic boolean flag.
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Boolean flags do not take any arguments, and their value is either
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``True`` (1) or ``False`` (0). The false value is specified on the command
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line by prepending the word ``'no'`` to either the long or the short flag
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name.
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For example, if a Boolean flag was created whose long name was
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``'update'`` and whose short name was ``'x'``, then this flag could be
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explicitly unset through either ``--noupdate`` or ``--nox``.
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"""
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def __init__(
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self,
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name: Text,
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default: Union[Optional[bool], Text],
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help: Optional[Text], # pylint: disable=redefined-builtin
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short_name: Optional[Text] = None,
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**args
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) -> None:
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p = _argument_parser.BooleanParser()
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super(BooleanFlag, self).__init__(
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p, None, name, default, help, short_name, True, **args
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)
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class EnumFlag(Flag[Text]):
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"""Basic enum flag; its value can be any string from list of enum_values."""
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def __init__(
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self,
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name: Text,
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default: Optional[Text],
|
||
|
|
help: Optional[Text], # pylint: disable=redefined-builtin
|
||
|
|
enum_values: Iterable[Text],
|
||
|
|
short_name: Optional[Text] = None,
|
||
|
|
case_sensitive: bool = True,
|
||
|
|
**args
|
||
|
|
):
|
||
|
|
p = _argument_parser.EnumParser(enum_values, case_sensitive)
|
||
|
|
g = _argument_parser.ArgumentSerializer()
|
||
|
|
super(EnumFlag, self).__init__(
|
||
|
|
p, g, name, default, help, short_name, **args)
|
||
|
|
# NOTE: parser should be typed EnumParser but the constructor
|
||
|
|
# restricts the available interface to ArgumentParser[str].
|
||
|
|
self.parser = p
|
||
|
|
self.help = '<%s>: %s' % ('|'.join(p.enum_values), self.help)
|
||
|
|
|
||
|
|
def _extra_xml_dom_elements(
|
||
|
|
self, doc: minidom.Document
|
||
|
|
) -> List[minidom.Element]:
|
||
|
|
elements = []
|
||
|
|
for enum_value in self.parser.enum_values:
|
||
|
|
elements.append(_helpers.create_xml_dom_element(
|
||
|
|
doc, 'enum_value', enum_value))
|
||
|
|
return elements
|
||
|
|
|
||
|
|
|
||
|
|
class EnumClassFlag(Flag[_ET]):
|
||
|
|
"""Basic enum flag; its value is an enum class's member."""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
name: Text,
|
||
|
|
default: Union[Optional[_ET], Text],
|
||
|
|
help: Optional[Text], # pylint: disable=redefined-builtin
|
||
|
|
enum_class: Type[_ET],
|
||
|
|
short_name: Optional[Text] = None,
|
||
|
|
case_sensitive: bool = False,
|
||
|
|
**args
|
||
|
|
):
|
||
|
|
p = _argument_parser.EnumClassParser(
|
||
|
|
enum_class, case_sensitive=case_sensitive)
|
||
|
|
g = _argument_parser.EnumClassSerializer(lowercase=not case_sensitive)
|
||
|
|
super(EnumClassFlag, self).__init__(
|
||
|
|
p, g, name, default, help, short_name, **args)
|
||
|
|
# NOTE: parser should be typed EnumClassParser[_ET] but the constructor
|
||
|
|
# restricts the available interface to ArgumentParser[_ET].
|
||
|
|
self.parser = p
|
||
|
|
self.help = '<%s>: %s' % ('|'.join(p.member_names), self.help)
|
||
|
|
|
||
|
|
def _extra_xml_dom_elements(
|
||
|
|
self, doc: minidom.Document
|
||
|
|
) -> List[minidom.Element]:
|
||
|
|
elements = []
|
||
|
|
for enum_value in self.parser.enum_class.__members__.keys():
|
||
|
|
elements.append(_helpers.create_xml_dom_element(
|
||
|
|
doc, 'enum_value', enum_value))
|
||
|
|
return elements
|
||
|
|
|
||
|
|
|
||
|
|
class MultiFlag(Generic[_T], Flag[List[_T]]):
|
||
|
|
"""A flag that can appear multiple time on the command-line.
|
||
|
|
|
||
|
|
The value of such a flag is a list that contains the individual values
|
||
|
|
from all the appearances of that flag on the command-line.
|
||
|
|
|
||
|
|
See the __doc__ for Flag for most behavior of this class. Only
|
||
|
|
differences in behavior are described here:
|
||
|
|
|
||
|
|
* The default value may be either a single value or an iterable of values.
|
||
|
|
A single value is transformed into a single-item list of that value.
|
||
|
|
|
||
|
|
* The value of the flag is always a list, even if the option was
|
||
|
|
only supplied once, and even if the default value is a single
|
||
|
|
value
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, *args, **kwargs):
|
||
|
|
super(MultiFlag, self).__init__(*args, **kwargs)
|
||
|
|
self.help += ';\n repeat this option to specify a list of values'
|
||
|
|
|
||
|
|
def parse(self, arguments: Union[Text, _T, Iterable[_T]]): # pylint: disable=arguments-renamed
|
||
|
|
"""Parses one or more arguments with the installed parser.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
arguments: a single argument or a list of arguments (typically a
|
||
|
|
list of default values); a single argument is converted
|
||
|
|
internally into a list containing one item.
|
||
|
|
"""
|
||
|
|
new_values = self._parse(arguments)
|
||
|
|
if self.present:
|
||
|
|
self.value.extend(new_values)
|
||
|
|
else:
|
||
|
|
self.value = new_values
|
||
|
|
self.present += len(new_values)
|
||
|
|
|
||
|
|
def _parse(self, arguments: Union[Text, Optional[Iterable[_T]]]) -> List[_T]: # pylint: disable=arguments-renamed
|
||
|
|
if (isinstance(arguments, abc.Iterable) and
|
||
|
|
not isinstance(arguments, str)):
|
||
|
|
arguments = list(arguments)
|
||
|
|
|
||
|
|
if not isinstance(arguments, list):
|
||
|
|
# Default value may be a list of values. Most other arguments
|
||
|
|
# will not be, so convert them into a single-item list to make
|
||
|
|
# processing simpler below.
|
||
|
|
arguments = [arguments]
|
||
|
|
|
||
|
|
return [super(MultiFlag, self)._parse(item) for item in arguments]
|
||
|
|
|
||
|
|
def _serialize(self, value: Optional[List[_T]]) -> Text:
|
||
|
|
"""See base class."""
|
||
|
|
if not self.serializer:
|
||
|
|
raise _exceptions.Error(
|
||
|
|
'Serializer not present for flag %s' % self.name)
|
||
|
|
if value is None:
|
||
|
|
return ''
|
||
|
|
|
||
|
|
serialized_items = [
|
||
|
|
super(MultiFlag, self)._serialize(value_item) for value_item in value
|
||
|
|
]
|
||
|
|
|
||
|
|
return '\n'.join(serialized_items)
|
||
|
|
|
||
|
|
def flag_type(self):
|
||
|
|
"""See base class."""
|
||
|
|
return 'multi ' + self.parser.flag_type()
|
||
|
|
|
||
|
|
def _extra_xml_dom_elements(
|
||
|
|
self, doc: minidom.Document
|
||
|
|
) -> List[minidom.Element]:
|
||
|
|
elements = []
|
||
|
|
if hasattr(self.parser, 'enum_values'):
|
||
|
|
for enum_value in self.parser.enum_values: # pytype: disable=attribute-error
|
||
|
|
elements.append(_helpers.create_xml_dom_element(
|
||
|
|
doc, 'enum_value', enum_value))
|
||
|
|
return elements
|
||
|
|
|
||
|
|
|
||
|
|
class MultiEnumClassFlag(MultiFlag[_ET]): # pytype: disable=not-indexable
|
||
|
|
"""A multi_enum_class flag.
|
||
|
|
|
||
|
|
See the __doc__ for MultiFlag for most behaviors of this class. In addition,
|
||
|
|
this class knows how to handle enum.Enum instances as values for this flag
|
||
|
|
type.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
name: str,
|
||
|
|
default: Union[None, Iterable[_ET], _ET, Iterable[Text], Text],
|
||
|
|
help_string: str,
|
||
|
|
enum_class: Type[_ET],
|
||
|
|
case_sensitive: bool = False,
|
||
|
|
**args
|
||
|
|
):
|
||
|
|
p = _argument_parser.EnumClassParser(
|
||
|
|
enum_class, case_sensitive=case_sensitive)
|
||
|
|
g = _argument_parser.EnumClassListSerializer(
|
||
|
|
list_sep=',', lowercase=not case_sensitive)
|
||
|
|
super(MultiEnumClassFlag, self).__init__(
|
||
|
|
p, g, name, default, help_string, **args)
|
||
|
|
# NOTE: parser should be typed EnumClassParser[_ET] but the constructor
|
||
|
|
# restricts the available interface to ArgumentParser[str].
|
||
|
|
self.parser = p
|
||
|
|
# NOTE: serializer should be non-Optional but this isn't inferred.
|
||
|
|
self.serializer = g
|
||
|
|
self.help = (
|
||
|
|
'<%s>: %s;\n repeat this option to specify a list of values' %
|
||
|
|
('|'.join(p.member_names), help_string or '(no help available)'))
|
||
|
|
|
||
|
|
def _extra_xml_dom_elements(
|
||
|
|
self, doc: minidom.Document
|
||
|
|
) -> List[minidom.Element]:
|
||
|
|
elements = []
|
||
|
|
for enum_value in self.parser.enum_class.__members__.keys(): # pytype: disable=attribute-error
|
||
|
|
elements.append(_helpers.create_xml_dom_element(
|
||
|
|
doc, 'enum_value', enum_value))
|
||
|
|
return elements
|
||
|
|
|
||
|
|
def _serialize_value_for_xml(self, value):
|
||
|
|
"""See base class."""
|
||
|
|
if value is not None:
|
||
|
|
if not self.serializer:
|
||
|
|
raise _exceptions.Error(
|
||
|
|
'Serializer not present for flag %s' % self.name
|
||
|
|
)
|
||
|
|
value_serialized = self.serializer.serialize(value)
|
||
|
|
else:
|
||
|
|
value_serialized = ''
|
||
|
|
return value_serialized
|