67    def create(val, name_base, varset):  argument
69          return Expression(val, name_base, varset)
73          return Variable(val, name_base, varset)
158    def __init__(self, val, name, varset):  argument
177       self.index = varset[self.var_name]
191    def __init__(self, expr, name_base, varset):  argument
202       self.sources = [ Value.create(src, "{0}_{1}".format(name_base, i), varset)
301    def __init__(self, varset):  argument
303       self._var_classes = [0] * len(varset.names)
483       varset = VarSet()
487          self.search = Expression(search, "search{0}".format(self.id), varset)
489       varset.lock()
494          self.replace = Value.create(replace, "replace{0}".format(self.id), varset)
496       BitSizeValidator(varset).validate(self.search, self.replace)