[issue17368] Python version of JSON decoder does not work with object_pairs_hook

[Aki]

New submission from Aki:

Specifying any object_pairs_hook makes JSON decoding break when JSONObject from json/decoder.py is used.

Can be emulated easily by setting c_make_scanner = None at json/scanner.py

Example script:
**
import json
test = '{"key": "value", "empty": {}}'

def hook(pairs):
    return dict(pairs)

print(json.loads(test, object_pairs_hook=hook))
**

This test will fail because the return statement on line 166 in http://hg.python.org/cpython/file/cfc777407b03/Lib/json/decoder.py lacks "+ 1" even though the statement on line 170 has it. Basically, any empty JSON object will cause "ValueError: Extra data: [...]".

----------
components: Library (Lib)
messages: 183600
nosy: Kuukunen
priority: normal
severity: normal
status: open
title: Python version of JSON decoder does not work with object_pairs_hook
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17368>
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