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# Copyright (c) 2008-2011 Simplistix Ltd
# See license.txt for license details.
from textwrap import dedent
from functools import wraps
from inspect import getargspec
def generator(*args):
"""
A utility function for creating a generator that will yield the
supplied arguments.
"""
for i in args:
yield i
class Wrappings:
def __init__(self):
self.before = []
self.after = []
def wrap(before, after=None):
"""
A decorator that causes the supplied callables to be called before
or after the wrapped callable, as appropriate.
"""
def wrapper(wrapped):
if getattr(wrapped, '_wrappings', None) is None:
w = Wrappings()
@wraps(wrapped)
def wrapping(*args, **kw):
args = list(args)
to_add = len(getargspec(wrapped)[0][len(args):])
added = 0
for c in w.before:
r = c()
if added < to_add:
args.append(r)
added += 1
try:
return wrapped(*args, **kw)
finally:
for c in w.after:
c()
f = wrapping
f._wrappings = w
else:
f = wrapped
w = f._wrappings
w.before.append(before)
if after is not None:
w.after.insert(0, after)
return f
return wrapper
def extend_docstring(docstring, objs):
for obj in objs:
try:
obj.__doc__ = dedent(obj.__doc__) + docstring
except (AttributeError, TypeError): # python 2 or pypy 4.0.1 :-(
pass