"""Options and Choices for :py:meth:`pywikibot.input_choice`."""
#
# (C) Pywikibot team, 2015-2024
#
# Distributed under the terms of the MIT license.
#
from __future__ import annotations
import re
from abc import ABC, abstractmethod
from textwrap import fill
from typing import TYPE_CHECKING, Any
import pywikibot
from pywikibot.backports import Iterable, Mapping, Sequence
__all__ = (
'AlwaysChoice',
'Choice',
'ChoiceException',
'ContextOption',
'HighlightContextOption',
'IntegerOption',
'InteractiveReplace',
'LinkChoice',
'ListOption',
'MultipleChoiceList',
'NestedOption',
'Option',
'OutputProxyOption',
'QuitKeyboardInterrupt',
'ShowingListOption',
'ShowingMultipleChoiceList',
'StandardOption',
'StaticChoice',
'UnhandledAnswer',
)
if TYPE_CHECKING:
from typing_extensions import Literal
from pywikibot.page import BaseLink, Link, Page
[docs]
class Option(ABC):
"""
A basic option for input_choice.
The following methods need to be implemented:
- format(default=None)
- result(value)
- test(value)
The methods ``test`` and ``handled`` are in such a relationship that
when ``handled`` returns itself that ``test`` must return True for
that value. So if ``test`` returns False ``handled`` may not return
itself but it may return not None.
Also ``result`` only returns a sensible value when ``test`` returns
True for the same value.
"""
def __init__(self, stop: bool = True) -> None:
"""Initializer."""
self._stop = stop
@property
def stop(self) -> bool:
"""Return whether this option stops asking."""
return self._stop
[docs]
def handled(self, value: str) -> Option | None:
"""
Return the Option object that applies to the given value.
If this Option object doesn't know which applies it returns None.
"""
return self if self.test(value) else None
[docs]
def test(self, value: str) -> bool:
"""Return True whether this option applies."""
raise NotImplementedError
[docs]
@abstractmethod
def result(self, value: str) -> Any:
"""Return the actual value which is associated by the given one.
.. versionadded:: 6.2
*result()* is an abstract method and must be defined in
subclasses
"""
raise NotImplementedError
class OutputOption(Option):
"""An option that never stops and can output on each question.
:py:meth:`pywikibot.input_choice` uses before_question attribute to
decide whether to output before or after the question.
.. note:: OutputOption must have an :py:obj:`out` property which
returns a string for
:py:meth:`userinterface output()
<userinterfaces._interface_base.ABUIC.output>`
method.
"""
#: Place output before or after the question
before_question: bool = False
@property
def stop(self) -> bool:
"""Never stop asking."""
return False
def result(self, value: str) -> Any:
"""Just return None."""
return None
@property
def out(self) -> str:
"""String to be used when selected before or after the question.
.. note:: This method is used by :meth:`ui.input_choice
<userinterfaces._interface_base.ABUIC.input_choice>`
instead of deprecated :meth:`output`.
.. versionadded:: 6.2
"""
return ''
[docs]
class StandardOption(Option):
"""An option with a description and shortcut and returning the shortcut."""
def __init__(self, option: str, shortcut: str, **kwargs: Any) -> None:
"""
Initializer.
:param option: option string
:param shortcut: Shortcut of the option
"""
super().__init__(**kwargs)
self.option = option
self.shortcut = shortcut.lower()
[docs]
def result(self, value: str) -> Any:
"""Return the lowercased shortcut."""
return self.shortcut
[docs]
def test(self, value: str) -> bool:
"""Return True whether this option applies."""
return (self.shortcut.lower() == value.lower()
or self.option.lower() == value.lower())
[docs]
class OutputProxyOption(OutputOption, StandardOption):
"""An option which calls out property of the given output class."""
def __init__(self, option: str, shortcut: str, output: OutputOption,
**kwargs: Any) -> None:
"""Create a new option for the given sequence."""
super().__init__(option, shortcut, **kwargs)
self._outputter = output
@property
def out(self) -> str:
"""Return the contents."""
return self._outputter.out
[docs]
class NestedOption(OutputOption, StandardOption):
"""
An option containing other options.
It will return True in test if this option applies but False if a sub
option applies while handle returns the sub option.
"""
def __init__(self, option: str, shortcut: str, description: str,
options: Iterable[Option]) -> None:
"""Initializer."""
super().__init__(option, shortcut, stop=False)
self.description = description
self.options = options
[docs]
def handled(self, value: str) -> Option | None:
"""Return itself if it applies or the applying sub option."""
for option in self.options:
handled = option.handled(value)
if handled is not None:
return handled
return super().handled(value)
@property
def out(self) -> str:
"""Output of suboptions."""
return self._output
[docs]
class ContextOption(OutputOption, StandardOption):
"""An option to show more and more context."""
def __init__(self, option: str, shortcut: str, text: str, context: int,
delta: int = 100, start: int = 0, end: int = 0) -> None:
"""Initializer."""
super().__init__(option, shortcut, stop=False)
self.text = text
self.context = context
self.delta = delta
self.start = start
self.end = end
[docs]
def result(self, value: str) -> Any:
"""Add the delta to the context."""
self.context += self.delta
return None
@property
def out(self) -> str:
"""Output section of the text."""
start = max(0, self.start - self.context)
end = min(len(self.text), self.end + self.context)
return self.text[start:end]
[docs]
class Choice(StandardOption):
"""A simple choice consisting of an option, shortcut and handler."""
def __init__(
self,
option: str,
shortcut: str,
replacer: InteractiveReplace | None
) -> None:
"""Initializer."""
super().__init__(option, shortcut)
self._replacer = replacer
@property
def replacer(self) -> InteractiveReplace | None:
"""The replacer."""
return self._replacer
[docs]
@abstractmethod
def handle(self) -> Any:
"""Handle this choice. Must be implemented."""
raise NotImplementedError
[docs]
def handle_link(self) -> bool:
"""The current link will be handled by this choice."""
return False
[docs]
class StaticChoice(Choice):
"""A static choice which just returns the given value."""
def __init__(self, option: str, shortcut: str, result: Any) -> None:
"""Create instance with replacer set to None."""
super().__init__(option, shortcut, None)
self._result = result
[docs]
def handle(self) -> Any:
"""Return the predefined value."""
return self._result
[docs]
class LinkChoice(Choice):
"""A choice returning a mix of the link new and current link."""
def __init__(
self,
option: str,
shortcut: str,
replacer: InteractiveReplace | None,
replace_section: bool,
replace_label: bool
) -> None:
"""Initializer."""
super().__init__(option, shortcut, replacer)
self._section = replace_section
self._label = replace_label
[docs]
def handle(self) -> Any:
"""Handle by either applying the new section or label."""
if not self.replacer:
raise ValueError('LinkChoice requires a replacer')
kwargs = {}
if self._section:
kwargs['section'] = self.replacer._new.section
else:
kwargs['section'] = self.replacer.current_link.section
if self._label:
if self.replacer._new.anchor is None:
kwargs['label'] = self.replacer._new.canonical_title()
if self.replacer._new.section:
kwargs['label'] += '#' + self.replacer._new.section
else:
kwargs['label'] = self.replacer._new.anchor
else:
if self.replacer.current_link.anchor is None:
kwargs['label'] = self.replacer.current_groups['title']
if self.replacer.current_groups['section']:
kwargs['label'] += '#' \
+ self.replacer.current_groups['section']
else:
kwargs['label'] = self.replacer.current_link.anchor
return pywikibot.Link.create_separated(
self.replacer._new.canonical_title(), self.replacer._new.site,
**kwargs)
[docs]
class AlwaysChoice(Choice):
"""Add an option to always apply the default."""
def __init__(self, replacer: InteractiveReplace | None,
option: str = 'always', shortcut: str = 'a') -> None:
"""Initializer."""
super().__init__(option, shortcut, replacer)
self.always = False
[docs]
def handle(self) -> Any:
"""Handle the custom shortcut."""
self.always = True
return self.answer
[docs]
def handle_link(self) -> bool:
"""Directly return answer whether it's applying it always."""
return self.always
@property
def answer(self) -> Any:
"""Get the actual default answer instructing the replacement."""
if not self.replacer:
raise ValueError('AlwaysChoice requires a replacer')
return self.replacer.handle_answer(self.replacer._default)
[docs]
class IntegerOption(Option):
"""An option allowing a range of integers."""
def __init__(self, minimum: int = 1, maximum: int | None = None,
prefix: str = '', **kwargs: Any) -> None:
"""Initializer."""
super().__init__(**kwargs)
if not ((minimum is None or isinstance(minimum, int))
and (maximum is None or isinstance(maximum, int))):
raise ValueError(
'The minimum and maximum parameters must be int or None.')
if minimum is not None and maximum is not None and minimum > maximum:
raise ValueError('The minimum must be lower than the maximum.')
self._min = minimum
self._max = maximum
self.prefix = prefix
[docs]
def test(self, value: str) -> bool:
"""Return whether the value is an int and in the specified range."""
try:
int_value = self.parse(value)
except ValueError:
return False
return ((self.minimum is None or int_value >= self.minimum)
and (self.maximum is None or int_value <= self.maximum))
@property
def minimum(self) -> int:
"""Return the lower bound of the range of allowed values."""
return self._min
@property
def maximum(self) -> int | None:
"""Return the upper bound of the range of allowed values."""
return self._max
[docs]
def parse(self, value: str) -> int:
"""Return integer from value with prefix removed."""
if value.lower().startswith(self.prefix.lower()):
return int(value[len(self.prefix):])
raise ValueError('Value does not start with prefix')
[docs]
def result(self, value: str) -> Any:
"""Return a tuple with the prefix and value converted into an int."""
return self.prefix, self.parse(value)
[docs]
class ListOption(IntegerOption):
"""An option to select something from a list."""
def __init__(self, sequence: Sequence[str], prefix: str = '',
**kwargs: Any) -> None:
"""Initializer."""
self._list = sequence
try:
super().__init__(1, self.maximum, prefix, **kwargs)
except ValueError:
raise ValueError('The sequence is empty.')
del self._max
@property
def maximum(self) -> int:
"""Return the maximum value."""
return len(self._list)
[docs]
def result(self, value: str) -> Any:
"""Return a tuple with the prefix and selected value."""
return self.prefix, self._list[self.parse(value) - 1]
[docs]
class ShowingListOption(ListOption, OutputOption):
"""An option to show a list and select an item.
.. versionadded:: 3.0
"""
before_question = True
def __init__(self, sequence: Sequence[str], prefix: str = '',
pre: str | None = None, post: str | None = None,
**kwargs: Any) -> None:
"""Initializer.
:param pre: Additional comment printed before the list.
:param post: Additional comment printed after the list.
"""
super().__init__(sequence, prefix, **kwargs)
self.pre = pre
self.post = post
@property
def stop(self) -> bool:
"""Return whether this option stops asking."""
return self._stop
@property
def out(self) -> str:
"""Output text of the enumerated list."""
text = ''
if self.pre is not None:
text = self.pre + '\n'
width = len(str(self.maximum))
for i, item in enumerate(self._list, self.minimum):
text += '{:>{width}} - {}\n'.format(i, item, width=width)
if self.post is not None:
text += self.post + '\n'
return text
[docs]
class MultipleChoiceList(ListOption):
"""An option to select multiple items from a list.
.. versionadded:: 3.0
"""
[docs]
def test(self, value: str) -> bool:
"""Return whether the values are int and in the specified range."""
try:
values = [self.parse(val) for val in value.split(',')]
except ValueError:
return False
for val in values:
if self.minimum is not None and val < self.minimum:
break
if self.maximum is not None and val > self.maximum:
break
else:
return True
return False
[docs]
def result(self, value: str) -> Any:
"""Return a tuple with the prefix and selected values as a list."""
values = (self.parse(val) for val in value.split(','))
result = [self._list[val - 1] for val in values]
return self.prefix, result
[docs]
class ShowingMultipleChoiceList(ShowingListOption, MultipleChoiceList):
"""An option to show a list and select multiple items.
.. versionadded:: 3.0
"""
[docs]
class HighlightContextOption(ContextOption):
"""Show the original region highlighted."""
color = 'lightred'
@property
def out(self) -> str:
"""Highlighted output section of the text."""
start = max(0, self.start - self.context)
end = min(len(self.text), self.end + self.context)
return '{}<<{color}>>{}<<default>>{}'.format(
self.text[start:self.start],
self.text[self.start:self.end],
self.text[self.end:end],
color=self.color)
[docs]
class UnhandledAnswer(Exception): # noqa: N818
"""The given answer didn't suffice."""
def __int__(self, stop: bool = False) -> None:
"""Initializer."""
self.stop = stop
[docs]
class ChoiceException(StandardOption, Exception): # noqa: N818
"""A choice for input_choice which result in this exception."""
[docs]
def result(self, value: Any) -> Any:
"""Return itself to raise the exception."""
return self
[docs]
class QuitKeyboardInterrupt(ChoiceException, KeyboardInterrupt): # noqa: N818
"""The user has cancelled processing at a prompt."""
def __init__(self) -> None:
"""Constructor using the 'quit' ('q') in input_choice."""
super().__init__('quit', 'q')
[docs]
class InteractiveReplace:
"""A callback class for textlib's replace_links.
It shows various options which can be switched on and off:
* allow_skip_link = True (skip the current link)
* allow_unlink = True (unlink)
* allow_replace = False (just replace target, keep section and label)
* allow_replace_section = False (replace target and section, keep label)
* allow_replace_label = False (replace target and label, keep section)
* allow_replace_all = False (replace target, section and label)
(The boolean values are the default values)
It has also a ``context`` attribute which must be a non-negative
integer. If it is greater 0 it shows that many characters before and
after the link in question. The ``context_delta`` attribute can be
defined too and adds an option to increase ``context`` by the given
amount each time the option is selected.
Additional choices can be defined using the 'additional_choices' and will
be amended to the choices defined by this class. This list is mutable and
the Choice instance returned and created by this class are too.
"""
def __init__(self,
old_link: Link | Page,
new_link: Link | Page | Literal[False],
default: str | None = None,
automatic_quit: bool = True) -> None:
"""Initializer.
:param old_link: The old link which is searched. The label and section
are ignored.
:param new_link: The new link with which it should be replaced.
Depending on the replacement mode it'll use this link's label and
section. If False it'll unlink all and the attributes beginning
with allow_replace are ignored.
:param default: The default answer as the shortcut
:param automatic_quit: Add an option to quit and raise a
QuitKeyboardException.
"""
if isinstance(old_link, pywikibot.Page):
self._old = old_link._link
else:
self._old = old_link
if isinstance(new_link, pywikibot.Page):
self._new: BaseLink | Literal[False] = new_link._link
else:
self._new = new_link
self._default = default
self._quit = automatic_quit
self._current_match: tuple[
Link | Page,
str,
Mapping[str, str],
tuple[int, int]
] | None = None
self.context = 30
self.context_delta = 0
self.allow_skip_link = True
self.allow_unlink = True
self.allow_replace = False
self.allow_replace_section = False
self.allow_replace_label = False
self.allow_replace_all = False
# Use list to preserve order
self._own_choices: list[tuple[str, StandardOption]] = [
('skip_link', StaticChoice('Do not change', 'n', None)),
('unlink', StaticChoice('Unlink', 'u', False)),
]
if self._new:
self._own_choices += [
('replace', LinkChoice('Change link target', 't', self,
False, False)),
('replace_section', LinkChoice(
'Change link target and section', 's', self, True, False)),
('replace_label', LinkChoice('Change link target and label',
'l', self, False, True)),
('replace_all', LinkChoice('Change complete link', 'c', self,
True, True)),
]
self.additional_choices: list[StandardOption] = []
[docs]
def handle_answer(self, choice: str) -> Any:
"""Return the result for replace_links."""
for c in self.choices:
if isinstance(c, Choice) and c.shortcut == choice:
return c.handle()
raise ValueError(f'Invalid choice "{choice}"')
def __call__(self, link: Link | Page,
text: str, groups: Mapping[str, str],
rng: tuple[int, int]) -> Any:
"""Ask user how the selected link should be replaced."""
if self._old == link:
self._current_match = (link, text, groups, rng)
while True:
try:
answer = self.handle_link()
except UnhandledAnswer as e:
if e.stop:
raise
else:
break
self._current_match = None # don't reset in case of an exception
return answer
return None
@property
def choices(self) -> tuple[StandardOption, ...]:
"""Return the tuple of choices."""
choices = []
for name, choice in self._own_choices:
if getattr(self, 'allow_' + name):
choices += [choice]
if self.context_delta > 0:
choices += [HighlightContextOption(
'more context', 'm', self.current_text, self.context,
self.context_delta, *self.current_range)]
choices += self.additional_choices
return tuple(choices)
[docs]
def handle_link(self) -> Any:
"""Handle the currently given replacement."""
choices = self.choices
for c in choices:
if isinstance(c, AlwaysChoice) and c.handle_link():
return c.answer
question = 'Should the link '
if self.context > 0:
rng = self.current_range
text = self.current_text
# at the beginning of the link, start red color.
# at the end of the link, reset the color to default
pywikibot.info(text[max(0, rng[0] - self.context): rng[0]]
+ f'<<lightred>>{text[rng[0]:rng[1]]}<<default>>'
+ text[rng[1]: rng[1] + self.context])
else:
question += (
f'<<lightred>>{self._old.canonical_title()}<<default>> ')
if self._new is False:
question += 'be unlinked?'
else:
question += 'target to <<lightpurple>>{}<<default>>?'.format(
self._new.canonical_title())
choice = pywikibot.input_choice(question, choices,
default=self._default,
automatic_quit=self._quit)
assert isinstance(choice, str)
return self.handle_answer(choice)
@property
def current_link(self) -> Link | Page:
"""Get the current link when it's handling one currently."""
if self._current_match is None:
raise ValueError('No current link')
return self._current_match[0]
@property
def current_text(self) -> str:
"""Get the current text when it's handling one currently."""
if self._current_match is None:
raise ValueError('No current text')
return self._current_match[1]
@property
def current_groups(self) -> Mapping[str, str]:
"""Get the current groups when it's handling one currently."""
if self._current_match is None:
raise ValueError('No current groups')
return self._current_match[2]
@property
def current_range(self) -> tuple[int, int]:
"""Get the current range when it's handling one currently."""
if self._current_match is None:
raise ValueError('No current range')
return self._current_match[3]