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51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# This file is part of the myhdl library, a Python package for using
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# Python as a Hardware Description Language.
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#
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# Copyright (C) 2003-2008 Jan Decaluwe
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#
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# The myhdl library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 2.1 of the
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# License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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""" Module with the always function. """
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from types import FunctionType
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from myhdl import InstanceError
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from myhdl._util import _isGenFunc
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from myhdl._Waiter import _inferWaiter
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class _error:
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pass
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_error.NrOfArgs = "decorated generator function should not have arguments"
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_error.ArgType = "decorated object should be a generator function"
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def instance(genFunc):
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if not isinstance(genFunc, FunctionType):
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raise InstanceError(_error.ArgType)
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if not _isGenFunc(genFunc):
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raise InstanceError(_error.ArgType)
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if genFunc.func_code.co_argcount > 0:
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raise InstanceError(_error.NrOfArgs)
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return _Instantiator(genFunc)
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class _Instantiator(object):
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def __init__(self, genFunc):
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self.genfunc = genFunc
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self.gen = genFunc()
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self.waiter = _inferWaiter(self.gen)
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