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authormonster <monster@ydb.tech>2022-07-07 14:41:37 +0300
committermonster <monster@ydb.tech>2022-07-07 14:41:37 +0300
commit06e5c21a835c0e923506c4ff27929f34e00761c2 (patch)
tree75efcbc6854ef9bd476eb8bf00cc5c900da436a2 /contrib/python/prompt-toolkit/py2/prompt_toolkit/reactive.py
parent03f024c4412e3aa613bb543cf1660176320ba8f4 (diff)
downloadydb-06e5c21a835c0e923506c4ff27929f34e00761c2.tar.gz
fix ya.make
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-"""
-Prompt_toolkit is designed a way that the amount of changing state is reduced
-to a minimum. Where possible, code is written in a pure functional way. In
-general, this results in code where the flow is very easy to follow: the value
-of a variable can be deducted from its first assignment.
-
-However, often, practicality and performance beat purity and some classes still
-have a changing state. In order to not having to care too much about
-transferring states between several components we use some reactive
-programming. Actually some kind of data binding.
-
-We introduce two types:
-
-- Filter: for binding a boolean state. They can be chained using & and |
- operators. Have a look in the ``filters`` module. Resolving the actual value
- of a filter happens by calling it.
-
-- Integer: for binding integer values. Reactive operations (like addition and
- substraction) are not suppported. Resolving the actual value happens by
- casting it to int, like ``int(integer)``. This way, it is possible to use
- normal integers as well for static values.
-"""
-from __future__ import unicode_literals
-from abc import ABCMeta, abstractmethod
-from six import with_metaclass
-
-
-class Integer(with_metaclass(ABCMeta, object)):
- """
- Reactive integer -- anything that can be resolved to an ``int``.
- """
- @abstractmethod
- def __int__(self):
- return 0
-
- @classmethod
- def from_callable(cls, func):
- """
- Create an Integer-like object that calls the given function when it is
- resolved to an int.
- """
- return _IntegerFromCallable(func)
-
-
-Integer.register(int)
-
-
-class _IntegerFromCallable(Integer):
- def __init__(self, func=0):
- self.func = func
-
- def __repr__(self):
- return 'Integer.from_callable(%r)' % self.func
-
- def __int__(self):
- return int(self.func())