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| cdef class reify: | |
| """Use as a class method decorator. It operates almost exactly like | |
| the Python `@property` decorator, but it puts the result of the | |
| method it decorates into the instance dict after the first call, | |
| effectively replacing the function it decorates with an instance | |
| variable. It is, in Python parlance, a data descriptor. | |
| """ | |
| cdef object wrapped | |
| cdef object name | |
| def __init__(self, wrapped): | |
| self.wrapped = wrapped | |
| self.name = wrapped.__name__ | |
| def __doc__(self): | |
| return self.wrapped.__doc__ | |
| def __get__(self, inst, owner): | |
| try: | |
| try: | |
| return inst._cache[self.name] | |
| except KeyError: | |
| val = self.wrapped(inst) | |
| inst._cache[self.name] = val | |
| return val | |
| except AttributeError: | |
| if inst is None: | |
| return self | |
| raise | |
| def __set__(self, inst, value): | |
| raise AttributeError("reified property is read-only") | |