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# http://pyrocko.org - GPLv3
#
# The Pyrocko Developers, 21st Century
# ---|P------/S----------~Lg----------
class Stage(object):
def __init__(self, f):
self._f = f
self._parent = None
self._cache = {}
def __call__(self, *x, **kwargs):
if kwargs.get('nocache', False):
return self.call_nocache(*x)
if x not in self._cache:
if self._parent is not None:
self._cache[x] = self._f(self._parent(*x[:-1]), *x[-1])
else:
self._cache[x] = self._f(*x[-1])
return self._cache[x]
def call_nocache(self, *x):
if self._parent is not None:
return self._f(self._parent.call_nocache(*x[:-1]), *x[-1])
else:
return self._f(*x[-1])
def clear(self):
self._cache.clear()
class Chain(object):
def __init__(self, *stages):
parent = None
self.stages = []
for stage in stages:
if not isinstance(stage, Stage):
stage = Stage(stage)
stage._parent = parent
parent = stage
self.stages.append(stage)
def clear(self):
for stage in self.stages:
stage.clear()
def __call__(self, *x, **kwargs):
return self.stages[len(x)-1](*x, **kwargs)
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