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84 lines
1.8 KiB
Python
Executable File
84 lines
1.8 KiB
Python
Executable File
# $Id$
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#
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# Copyright (C) 2003 Rational Discovery LLC
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# All Rights Reserved
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#
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import sys
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from VLib.Node import VLibNode
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class TransformNode(VLibNode):
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""" base class for nodes which filter their input
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Assumptions:
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- transform function takes a number of arguments equal to the
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number of inputs we have. We return whatever it returns
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- inputs (parents) can be stepped through in lockstep
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Usage Example:
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>>> from VLib.Supply import SupplyNode
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>>> def func(a,b):
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... return a+b
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>>> tform = TransformNode(func)
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>>> suppl1 = SupplyNode(contents=[1,2,3,3])
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>>> suppl2 = SupplyNode(contents=[1,2,3,1])
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>>> tform.AddParent(suppl1)
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>>> tform.AddParent(suppl2)
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>>> v = [x for x in tform]
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>>> v
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[2, 4, 6, 4]
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>>> tform.reset()
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>>> v = [x for x in tform]
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>>> v
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[2, 4, 6, 4]
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If we don't provide a function, just return the inputs:
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>>> tform = TransformNode()
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>>> suppl1 = SupplyNode(contents=[1,2,3,3])
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>>> suppl2 = SupplyNode(contents=[1,2,3,1])
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>>> tform.AddParent(suppl1)
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>>> tform.AddParent(suppl2)
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>>> v = [x for x in tform]
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>>> v
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[(1, 1), (2, 2), (3, 3), (3, 1)]
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"""
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def __init__(self,func=None,**kwargs):
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VLibNode.__init__(self,**kwargs)
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self._func = func
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def next(self):
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done = 0
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parent = self.GetParents()[0]
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args = []
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try:
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for parent in self.GetParents():
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args.append(parent.next())
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except StopIteration:
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raise StopIteration
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args = tuple(args)
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if self._func is not None:
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res = apply(self._func,args)
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else:
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res = args
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return res
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#------------------------------------
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#
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# doctest boilerplate
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#
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def _test():
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import doctest,sys
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return doctest.testmod(sys.modules["__main__"])
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if __name__ == '__main__':
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import sys
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failed,tried = _test()
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sys.exit(failed)
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