jsonparser.h
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1 /*
2  * Copyright (C) 2011 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #ifndef CXXTOOLS_JSONPARSER_H
30 #define CXXTOOLS_JSONPARSER_H
31 
32 #include <cxxtools/api.h>
33 #include <cxxtools/string.h>
34 
35 namespace cxxtools
36 {
37  class DeserializerBase;
38 
40  {
41  class JsonStringParser
42  {
43  String _str;
44  unsigned _count;
45  unsigned short _value;
46 
47  enum
48  {
49  state_0,
50  state_esc,
51  state_hex
52  } _state;
53 
54  public:
55  JsonStringParser()
56  : _state(state_0)
57  { }
58 
59  bool advance(Char ch);
60 
61  void clear()
62  { _state = state_0; _str.clear(); }
63 
64  const String& str() const
65  { return _str; }
66  };
67 
68  public:
69  JsonParser();
70 
71  void begin(DeserializerBase& handler)
72  {
73  _state = state_0;
74  _token.clear();
75  _deserializer = &handler;
76  }
77 
78  int advance(Char ch); // 1: end character detected; -1: end but char not consumed; 0: no end
79  void finish();
80 
81  private:
82  enum
83  {
84  state_0,
85  state_object,
86  state_object_name,
87  state_object_after_name,
88  state_object_value,
89  state_object_e,
90  state_object_next_member,
91  state_array,
92  state_array_value,
93  state_array_e,
94  state_string,
95  state_number,
96  state_float,
97  state_token,
98  state_comment0,
99  state_commentline,
100  state_comment,
101  state_comment_e,
102  state_end
103  } _state, _nextState;
104 
105  String _token;
106 
107  DeserializerBase* _deserializer;
108  JsonStringParser _stringParser;
109  JsonParser* _next;
110  };
111 }
112 
113 #endif // CXXTOOLS_JSONPARSER_H