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Forward port r70471: Add object_pairs_hook. Issue 5381.

This commit is contained in:
Raymond Hettinger 2009-04-21 03:27:12 +00:00
parent 0ad98d8509
commit 9b8d069b31
1 changed files with 25 additions and 3 deletions
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Doc/library/json.rst
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@ -165,7 +165,7 @@ Basic Usage
:func:`dump`.
.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]])
.. function:: load(fp[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_pairs_hook[, **kw]]]]]]]])
Deserialize *fp* (a ``.read()``-supporting file-like object containing a JSON
document) to a Python object.
@ -181,6 +181,17 @@ Basic Usage
*object_hook* will be used instead of the :class:`dict`. This feature can be used
to implement custom decoders (e.g. JSON-RPC class hinting).
*object_pairs_hook* is an optional function that will be called with the
result of any object literal decode with an ordered list of pairs. The
return value of *object_pairs_hook* will be used instead of the
:class:`dict`. This feature can be used to implement custom decoders that
rely on the order that the key and value pairs are decoded (for example,
:func:`collections.OrderedDict` will remember the order of insertion). If
*object_hook* is also defined, the *object_pairs_hook* takes priority.
.. versionchanged:: 3.1
Added support for *object_pairs_hook*.
*parse_float*, if specified, will be called with the string of every JSON
float to be decoded. By default, this is equivalent to ``float(num_str)``.
This can be used to use another datatype or parser for JSON floats
@ -201,7 +212,7 @@ Basic Usage
class.
.. function:: loads(s[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, **kw]]]]]]])
.. function:: loads(s[, encoding[, cls[, object_hook[, parse_float[, parse_int[, parse_constant[, object_pairs_hook[, **kw]]]]]]]])
Deserialize *s* (a :class:`str` or :class:`unicode` instance containing a JSON
document) to a Python object.
@ -217,7 +228,7 @@ Basic Usage
Encoders and decoders
---------------------
.. class:: JSONDecoder([encoding[, object_hook[, parse_float[, parse_int[, parse_constant[, strict]]]]]])
.. class:: JSONDecoder([encoding[, object_hook[, parse_float[, parse_int[, parse_constant[, strict[, object_pairs_hook]]]]]]])
Simple JSON decoder.
@ -258,6 +269,17 @@ Encoders and decoders
:class:`dict`. This can be used to provide custom deserializations (e.g. to
support JSON-RPC class hinting).
*object_pairs_hook*, if specified will be called with the result of every
JSON object decoded with an ordered list of pairs. The return value of
*object_pairs_hook* will be used instead of the :class:`dict`. This
feature can be used to implement custom decoders that rely on the order
that the key and value pairs are decoded (for example,
:func:`collections.OrderedDict` will remember the order of insertion). If
*object_hook* is also defined, the *object_pairs_hook* takes priority.
.. versionchanged:: 3.1
Added support for *object_pairs_hook*.
*parse_float*, if specified, will be called with the string of every JSON
float to be decoded. By default, this is equivalent to ``float(num_str)``.
This can be used to use another datatype or parser for JSON floats