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 
39     class CXXTOOLS_API JsonParser
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:
JsonStringParser()55                     JsonStringParser()
56                         : _state(state_0)
57                         { }
58 
59                     bool advance(Char ch);
60 
clear()61                     void clear()
62                     { _state = state_0; _str.clear(); }
63 
str()64                     const String& str() const
65                     { return _str; }
66             };
67 
68         public:
69             JsonParser();
70 
begin(DeserializerBase & handler)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
114