# Source code for openpyxl.descriptors

    # Copyright (c) 2010-2024 openpyxl

    from .base import *
    from .sequence import Sequence

    class MetaStrict(type):

        def __new__(cls, clsname, bases, methods):
            for k, v in methods.items():
                if isinstance(v, Descriptor):
                    v.name = k
            return type.__new__(cls, clsname, bases, methods)

    class Strict(metaclass=MetaStrict):

        pass

    class MetaSerialisable(type):

        def __new__(cls, clsname, bases, methods):
            attrs = []
            nested = []
            elements = []
            namespaced = []
            for k, v in methods.items():
                if isinstance(v, Descriptor):
                    ns= getattr(v, 'namespace', None)
                    if ns:
                        namespaced.append((k, "{%s}%s" % (ns, k)))
                    if getattr(v, 'nested', False):
                        nested.append(k)
                        elements.append(k)
                    elif isinstance(v, Sequence):
                        elements.append(k)
                    elif isinstance(v, Typed):
                        if hasattr(v.expected_type, 'to_tree'):
                            elements.append(k)
                        elif isinstance(v.expected_type, tuple):
                            if any((hasattr(el, "to_tree") for el in v.expected_type)):
                                # don't bind elements as attrs
                                continue
                        else:
                            attrs.append(k)
                    else:
                        if not isinstance(v, Alias):
                            attrs.append(k)

            if methods.get('__attrs__') is None:
                methods['__attrs__'] = tuple(attrs)
            methods['__namespaced__'] = tuple(namespaced)
            if methods.get('__nested__') is None:
                methods['__nested__'] = tuple(sorted(nested))
            if methods.get('__elements__') is None:
                methods['__elements__'] = tuple(sorted(elements))
            return MetaStrict.__new__(cls, clsname, bases, methods)