Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/json.py @ 708:e692216f8756

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author Franz Glasner <f.glasner@feldmann-mg.com>
date Tue, 15 Aug 2023 11:14:51 +0200
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2018-2022, Franz Glasner. All rights reserved.
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4 # :License: BSD-3-Clause. See LICENSE.txt for details.
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5 # :-
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6 """Read JSON-style configuration files.
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7
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8 """
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9
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10 from __future__ import division, absolute_import, print_function
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11
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12
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13 __all__ = ["load"]
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14
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15
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16 import io
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17 import json.decoder
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18 try:
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19 from collections import OrderedDict as DictImpl
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20 except ImportError:
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21 try:
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22 from ordereddict import OrderedDict as DictImpl
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23 except ImportError:
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24 DictImpl = dict
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25
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26 from .compat import u2fs
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27
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28
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29 #
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30 # Determine whether the JSONDecoder has the "object_pairs_hook"
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31 # parameter once
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32 #
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33 try:
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34 json.decoder.JSONDecoder(object_pairs_hook=DictImpl)
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35 except TypeError:
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36 _with_object_pairs_hook = False
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37 else:
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38 _with_object_pairs_hook = True
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39
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40
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41 def load(filename, encoding="utf-8"):
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42 """Load a single JSON file with name `filename` and encoding `encoding`.
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43
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44 """
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45 with io.open(u2fs(filename), mode="rt", encoding=encoding) as jsfp:
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46 #
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47 # The scanner (not to be changed yet) does only recognize decimal
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48 # integers yet.
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49 #
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50 kwds = {
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51 "parse_int": lambda s: int(s, 0),
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52 "strict": False
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53 }
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54 if _with_object_pairs_hook:
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55 kwds["object_pairs_hook"] = DictImpl
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56 decoder = json.decoder.JSONDecoder(**kwds)
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57 data = decoder.decode(jsfp.read())
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58 if not isinstance(data, DictImpl):
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59 raise TypeError("JSON root must be an object (i.e. dict)")
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60 return data