class NodeBase(NodeMetaClassBase): __slots__ = "parent", "source_ref" # Avoid the attribute unless it's really necessary. if Options.isFullCompat(): __slots__ += ("effective_source_ref",) def setCompatibleSourceReference(self, source_ref): """ Bug compatible line numbers information. As CPython outputs the last bit of bytecode executed, and not the line of the operation. For example calls, output the line of the last argument, as opposed to the line of the operation start. For tests, we wants to be compatible. In improved more, we are not being fully compatible, and just drop it altogether. """ # Getting the same source reference can be dealt with quickly, so do # this first. if self.source_ref is not source_ref and \ Options.isFullCompat() and \ self.source_ref != source_ref: # An attribute outside of "__init__", so we save one memory for the # most cases. Very few cases involve splitting across lines. # pylint: disable=W0201 self.effective_source_ref = source_ref