mx_compat.py 文件源码

def _ensureCompatLoaded():
    if not _versionsMap:

        def flattenClassTree(tree):
            root = tree[0][0]
            assert isinstance(root, types.TypeType), root
            yield root
            if len(tree) > 1:
                assert len(tree) == 2
                rest = tree[1]
                assert isinstance(rest, types.ListType), rest
                for c in flattenClassTree(rest):
                    yield c

        classes = []
        regex = re.compile(r'^MxCompatibility[0-9a-z]*$')
        for name, clazz in inspect.getmembers(sys.modules[__name__], inspect.isclass):
            m = regex.match(name)
            if m:
                classes.append(clazz)

        previousVersion = None
        for clazz in flattenClassTree(inspect.getclasstree(classes)):
            if clazz == object:
                continue
            assert previousVersion is None or previousVersion < clazz.version()
            previousVersion = clazz.version()
            _versionsMap[previousVersion] = clazz()