Source Code for Module lepl.contrib.json

 1   
 2  # The contents of this file are subject to the Mozilla Public License 
 3  # (MPL) Version 1.1 (the "License"); you may not use this file except 
 4  # in compliance with the License. You may obtain a copy of the License 
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 7  # Software distributed under the License is distributed on an "AS IS" 
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 9  # the License for the specific language governing rights and 
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11  # 
12  # The Original Code is LEPL (http://www.acooke.org/lepl) 
13  # The Initial Developer of the Original Code is Andrew Cooke. 
14  # Portions created by the Initial Developer are Copyright (C) 2009-2010 
15  # Andrew Cooke (andrew@acooke.org). All Rights Reserved. 
16  # 
17  # Contributor(s): 
18  # - "magcius" / jstpierre at mecheye dot net 
19  # Portions created by the Contributors are Copyright (C) 2010 
20  # The Contributors.  All Rights Reserved. 
21  # 
22  # Alternatively, the contents of this file may be used under the terms 
23  # of the LGPL license (the GNU Lesser General Public License, 
24  # http://www.gnu.org/licenses/lgpl.html), in which case the provisions 
25  # of the LGPL License are applicable instead of those above. 
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28  # terms of the LGPL License and not to allow others to use your version 
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33  # MPL or the LGPL License. 
34   
35  ''' 
36  http://www.ietf.org/rfc/rfc4627.txt 
37  ''' 
38   
39   
40  from lepl import * 
41  from lepl.support.lib import str 
42   
43   
44 -def Simple(): 
45      ''' 
46      A simple JSON parser. 
47      ''' 
48       
49      escapes = {'\\b': '\b', '\\f': '\f', '\\n': '\n', '\\t': '\t', '\\r': '\r'} 
50       
51      def unescape_string(text): 
52          return escapes[text] 
53       
54      def unescape_unicode(text): 
55          # Python 3 only 
56          return bytes(str(text), 'utf8').decode('unicode_escape') 
57       
58      value          = Delayed() 
59   
60      unicode_escape = ("\\u" + Digit()[4, ...])   >> unescape_unicode 
61      regular_escape = ("\\" + Any("bfntr"))       >> unescape_string 
62      escape         = (unicode_escape | regular_escape) 
63      string         = (Drop('"') & (AnyBut('"\\') | escape)[...] & Drop('"')) 
64       
65      number         = Real() >> float 
66       
67      comma          = Drop(',') 
68       
69      with DroppedSpace(): 
70          array          = Drop("[") & value[:, comma] & Drop("]")  > list 
71       
72          pair           = string & Drop(":") & value               > tuple 
73          object_        = Drop("{") & pair[:, comma] & Drop("}")   > dict 
74       
75       
76      value         += ((Literal('true')  >= (lambda x: True)) | 
77                        (Literal('false') >= (lambda x: False)) | 
78                        (Literal('null')  >= (lambda x: None)) | 
79                        array | object_ | number | string) 
80   
81      return value 
82