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# Limited-size dictionary class to use for caches
class Cache:
def __init__(self, maxSize=256):
self.__maxSize = maxSize
self.__size = 0
self.__chopSize = maxSize//10
self.__chopSize = self.__chopSize and self.__chopSize or 1
self.__cache = {}
self.__usage = {}
def __contains__(self, k): return k in self.__cache
def __getitem__(self, k):
self.__usage[k] = self.__usage[k] + 1
return self.__cache[k]
def __len__(self): return self.__size
def __setitem__(self, k, v):
if self.__size >= self.__maxSize:
keys = list(self.__usage.keys())
keys.sort(key=lambda x,d=self.__usage: d[x])
for _k in keys[:self.__chopSize]:
del self.__cache[_k]
del self.__usage[_k]
self.__size = self.__size - self.__chopSize
if k not in self.__cache:
self.__size = self.__size + 1
self.__usage[k] = 0
self.__cache[k] = v
def __delitem__(self, k):
del self.__cache[k]
del self.__usage[k]
self.__size = self.__size - 1
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