JSONTag (tag.py)

Tagged JSON ~~~~~~~~~~~ A compact representation for lossless serialization of non-standard JSON types. :class:`~flask.sessions.SecureCookieSessionInterface` uses this to serialize the session data, but it may be useful in other places. It can be extended to support other types.

"""
Tagged JSON
~~~~~~~~~~~

A compact representation for lossless serialization of non-standard JSON
types. :class:`~flask.sessions.SecureCookieSessionInterface` uses this
to serialize the session data, but it may be useful in other places. It
can be extended to support other types.

.. autoclass:: TaggedJSONSerializer
    :members:

.. autoclass:: JSONTag
    :members:

Let's see an example that adds support for
:class:`~collections.OrderedDict`. Dicts don't have an order in JSON, so
to handle this we will dump the items as a list of ``[key, value]``
pairs. Subclass :class:`JSONTag` and give it the new key ``' od'`` to
identify the type. The session serializer processes dicts first, so
insert the new tag at the front of the order since ``OrderedDict`` must
be processed before ``dict``.



... (truncated -- full source via MCP)