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#-*- coding: utf-8 -*-
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# Copyright 2014 Calculate Ltd. http://www.calculate-linux.org
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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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from functools import wraps
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from itertools import tee
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from contextlib import contextmanager
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class SavableIterator:
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"""
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Итератор с возможность сохранять и восстанавливать состояние
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"""
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def __init__(self,seq):
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self.seq = iter(seq)
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self.back = None
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def __iter__(self):
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return self
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def save(self):
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self.seq, self.back = tee(self.seq)
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return self
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def restore(self):
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if self.back:
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self.seq, self.back = tee(self.back)
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return self
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def next(self):
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return self.seq.next()
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@contextmanager
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def ignore(exception):
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try:
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yield
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except exception:
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pass
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class AddonError(Exception):
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"""
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Исключение с добавочным сообщением
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"""
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def __init__(self, msg, addon=None):
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self.message = msg
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self.addon = addon
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Exception.__init__(self, msg)
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class FalseObject(object):
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"""
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Объект-заглушка при любом сравнении возвращает False
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"""
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def __lt__(self,other):
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return False
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def __nonzero__(self):
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return False
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__gt__ = __ge__ = __le__ = __eq__ = __ne__ = __lt__
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class Sizes(object):
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K = KiB = kibibyte = 1024
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kB = kilobyte = 1000
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M = MiB = mibibyte = K * 1024
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Mb = megabyte = kB * 1000
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G = GiB = gibibyte = M * 1024
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Gb = gigabyte = Mb * 1000
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T = TiB = tibibyte = G * 1024
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Tb = terabyte = Gb * 1000
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def __getattr__(self,name):
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if name.startswith('from_'):
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return lambda x:x*getattr(Sizes,name[5:])
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elif name.startswith('to_'):
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return lambda x:x/getattr(Sizes,name[3:])
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else:
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raise AttributeError
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def imap_regexp(re_compiled, l, whole=False):
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"""
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Обработать список регулярным выражением и вернуть полученные группы
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"""
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if whole:
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retfunc = lambda x: x.group()
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else:
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retfunc = lambda x: x.groups()
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return (retfunc(x) for x in (re_compiled.search(x) for x in l) if x)
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def cached(each_instance=False):
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"""
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Кэширование результата
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"""
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def cache_wrapper(func):
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value = {}
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def wrapper(*args, **kwargs):
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if each_instance:
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if args[0] not in value:
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value[args[0]] = func(*args, **kwargs)
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return value[args[0]]
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else:
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if not None in value:
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value[None] = func(*args, **kwargs)
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return value[None]
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return wrapper
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if each_instance in (True,False):
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return cache_wrapper
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else:
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return cache_wrapper(each_instance)
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class Singleton(type):
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_instances = {}
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def __call__(cls, *args, **kwargs):
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if cls not in cls._instances:
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cls._instances[cls] = super(Singleton, cls).__call__(*args,
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**kwargs)
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return cls._instances[cls]
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class ClassifyingIterator(object):
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"""
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Классифицирующий итератор
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"""
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def classificate(iterator):
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"""
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Классифицировать элементы по признаку (first первый last последний)
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"""
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class Mark:
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def __init__(self, first=False, last=False):
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self.first = first
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self.last = last
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def __repr__(self):
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return "Mark(first=%s,last=%s)"%(self.first,self.last)
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iterator = iter(iterator)
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obj = iterator.next()
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try:
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obj_next = iterator.next()
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yield Mark(first=True,last=False), obj
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try:
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while True:
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obj = obj_next
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obj_next = iterator.next()
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yield Mark(), obj
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except StopIteration:
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yield Mark(first=False,last=True), obj
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except StopIteration:
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yield Mark(first=True,last=True), obj
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def debug(prefix="DEBUG {name}({args},{kw})={ret}"):
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def debug_decor(f):
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@wraps(f)
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def wrapper(*args, **kw):
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ret = f(*args, **kw)
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print prefix.format(name=f.func_name, args=args, kw=kw, ret=ret)
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return ret
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return wrapper
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return debug_decor
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