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/string.h>
34 
35 namespace cxxtools
36 {
37  class JsonDeserializer;
38 
40  {
41  friend class JsonParser;
42  unsigned _lineNo;
43  mutable std::string _msg;
44 
45  public:
46  JsonParserError(const std::string& msg, unsigned lineNo)
47  : SerializationError(msg),
48  _lineNo(lineNo)
49  { }
50 
51  ~JsonParserError() throw()
52  { }
53 
54  const char* what() const throw();
55  };
56 
57  class JsonParser
58  {
59  class JsonStringParser
60  {
61  JsonParser* _jsonParser;
62  String _str;
63  unsigned _count;
64  unsigned short _value;
65 
66  enum
67  {
68  state_0,
69  state_esc,
70  state_hex
71  } _state;
72 
73  public:
74  explicit JsonStringParser(JsonParser* jsonParser)
75  : _jsonParser(jsonParser),
76  _state(state_0)
77  { }
78 
79  bool advance(Char ch);
80 
81  void clear()
82  { _state = state_0; _str.clear(); }
83 
84  const String& str() const
85  { return _str; }
86 
87  void str(const String& s)
88  { _str = s; }
89  };
90 
91  // make non copyable:
92  JsonParser(const JsonParser&);
93  JsonParser& operator=(const JsonParser&);
94 
95  public:
96  JsonParser();
97  ~JsonParser();
98 
99  void begin(JsonDeserializer& handler)
100  {
101  _state = state_0;
102  _token.clear();
103  _deserializer = &handler;
104  }
105 
106  int advance(Char ch); // 1: end character detected; -1: end but char not consumed; 0: no end
107  void finish();
108 
109  private:
110  enum
111  {
112  state_0,
113  state_object,
114  state_object_plainname,
115  state_object_name,
116  state_object_after_name,
117  state_object_value,
118  state_object_e,
119  state_object_next_member0,
120  state_object_next_member,
121  state_array,
122  state_array_value0,
123  state_array_value,
124  state_array_e,
125  state_string,
126  state_number,
127  state_float,
128  state_token,
129  state_comment0,
130  state_commentline,
131  state_comment,
132  state_comment_e,
133  state_end
134  } _state, _nextState;
135 
136  String _token;
137 
138  JsonDeserializer* _deserializer;
139  JsonStringParser _stringParser;
140  JsonParser* _next;
141  unsigned _lineNo;
142 
143  void doThrow(const std::string& msg);
144  void throwInvalidCharacter(Char ch);
145  };
146 }
147 
148 #endif // CXXTOOLS_JSONPARSER_H