Mercurial > public > mercurial-scm > hg
diff mercurial/thirdparty/zope/interface/__init__.py @ 37176:943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
I've been trying to formalize interfaces for various components
of Mercurial. So far, we've been using the "abc" package. This
package is "good enough" for a lot of tasks. But it quickly
falls over. For example, if you declare an @abc.abstractproperty,
you must implement that attribute with a @property or the class
compile time checking performed by abc will complain. This often
forces you to implement dumb @property wrappers to return a
_ prefixed attribute of the sane name. That's ugly.
I've also wanted to implement automated checking that classes
conform to various interfaces and don't expose other "public"
attributes.
After doing a bit of research and asking around, the general
consensus seems to be that zope.interface is the best package for
doing interface-based programming in Python. It has built-in
support for verifying classes and objects conform to interfaces.
It allows an interface's properties to be defined during __init__.
There's even an "adapter registry" that allow you to register
interfaces and look up which classes implement them. That could
potentially be useful for places where our custom registry.py
modules currently facilitates central registrations, but at a
type level. Imagine extensions providing alternate implementations
of things like the local repository interface to allow opening
repositories with custom requirements.
Anyway, this commit vendors zope.interface 4.4.3. The contents of
the source tarball have been copied into mercurial/thirdparty/zope/
without modifications.
Test modules have been removed because they are not interesting
to us.
The LICENSE.txt file has been copied so it lives next to the
source.
The Python modules don't use relative imports. zope/__init__.py
defines a namespace package. So we'll need to modify the source
code before this package is usable inside Mercurial. This will
be done in subsequent commits.
# no-check-commit for various style failures
Differential Revision: https://phab.mercurial-scm.org/D2928
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Wed, 21 Mar 2018 19:48:50 -0700 |
| parents | |
| children | 68ee61822182 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mercurial/thirdparty/zope/interface/__init__.py Wed Mar 21 19:48:50 2018 -0700 @@ -0,0 +1,90 @@ +############################################################################## +# +# Copyright (c) 2001, 2002 Zope Foundation and Contributors. +# All Rights Reserved. +# +# This software is subject to the provisions of the Zope Public License, +# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. +# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED +# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS +# FOR A PARTICULAR PURPOSE. +# +############################################################################## +"""Interfaces + +This package implements the Python "scarecrow" proposal. + +The package exports two objects, `Interface` and `Attribute` directly. It also +exports several helper methods. Interface is used to create an interface with +a class statement, as in: + + class IMyInterface(Interface): + '''Interface documentation + ''' + + def meth(arg1, arg2): + '''Documentation for meth + ''' + + # Note that there is no self argument + +To find out what you can do with interfaces, see the interface +interface, `IInterface` in the `interfaces` module. + +The package has several public modules: + + o `declarations` provides utilities to declare interfaces on objects. It + also provides a wide range of helpful utilities that aid in managing + declared interfaces. Most of its public names are however imported here. + + o `document` has a utility for documenting an interface as structured text. + + o `exceptions` has the interface-defined exceptions + + o `interfaces` contains a list of all public interfaces for this package. + + o `verify` has utilities for verifying implementations of interfaces. + +See the module doc strings for more information. +""" +__docformat__ = 'restructuredtext' + +from zope.interface.interface import Interface +from zope.interface.interface import _wire + +# Need to actually get the interface elements to implement the right interfaces +_wire() +del _wire + +from zope.interface.declarations import Declaration +from zope.interface.declarations import alsoProvides +from zope.interface.declarations import classImplements +from zope.interface.declarations import classImplementsOnly +from zope.interface.declarations import classProvides +from zope.interface.declarations import directlyProvidedBy +from zope.interface.declarations import directlyProvides +from zope.interface.declarations import implementedBy +from zope.interface.declarations import implementer +from zope.interface.declarations import implementer_only +from zope.interface.declarations import implements +from zope.interface.declarations import implementsOnly +from zope.interface.declarations import moduleProvides +from zope.interface.declarations import named +from zope.interface.declarations import noLongerProvides +from zope.interface.declarations import providedBy +from zope.interface.declarations import provider +from zope.interface.exceptions import Invalid +from zope.interface.interface import Attribute +from zope.interface.interface import invariant +from zope.interface.interface import taggedValue + +# The following are to make spec pickles cleaner +from zope.interface.declarations import Provides + + +from zope.interface.interfaces import IInterfaceDeclaration + +moduleProvides(IInterfaceDeclaration) + +__all__ = ('Interface', 'Attribute') + tuple(IInterfaceDeclaration)