aboutsummaryrefslogtreecommitdiff
path: root/include/jsoncons_ext/cbor/cbor_cursor2.hpp
blob: eee74450afa2f2ffdae72c0ba4631358a0b64f92 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
// Copyright 2018 Daniel Parker
// Distributed under the Boost license, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// See https://github.com/danielaparker/jsoncons for latest version

#ifndef JSONCONS_CBOR_CBOR_CURSOR2_HPP
#define JSONCONS_CBOR_CBOR_CURSOR2_HPP

#include <memory> // std::allocator
#include <string>
#include <vector>
#include <stdexcept>
#include <system_error>
#include <ios>
#include <istream> // std::basic_istream
#include <jsoncons/byte_string.hpp>
#include <jsoncons/config/jsoncons_config.hpp>
#include <jsoncons/json_visitor2.hpp>
#include <jsoncons/json_exception.hpp>
#include <jsoncons/staj2_cursor.hpp>
#include <jsoncons/source.hpp>
#include <jsoncons_ext/cbor/cbor_parser.hpp>

namespace jsoncons { 
namespace cbor {

    template<class Source=jsoncons::binary_stream_source,class Allocator=std::allocator<char>>
    class basic_cbor_cursor2 : public basic_staj2_cursor<char>, private virtual ser_context
    {
    public:
        using source_type = Source;
        using char_type = char;
        using allocator_type = Allocator;
    private:
        basic_cbor_parser<Source,Allocator> parser_;
        basic_staj2_visitor<char_type> cursor_visitor_;
        bool eof_;

        // Noncopyable and nonmoveable
        basic_cbor_cursor2(const basic_cbor_cursor2&) = delete;
        basic_cbor_cursor2& operator=(const basic_cbor_cursor2&) = delete;

    public:
        using string_view_type = string_view;

        template <class Sourceable>
        basic_cbor_cursor2(Sourceable&& source,
                          const cbor_decode_options& options = cbor_decode_options(),
                          const Allocator& alloc = Allocator())
            : parser_(std::forward<Sourceable>(source), options, alloc), 
              cursor_visitor_(accept_all), 
              eof_(false)
        {
            if (!done())
            {
                next();
            }
        }

        // Constructors that set parse error codes

        template <class Sourceable>
        basic_cbor_cursor2(Sourceable&& source, 
                          std::error_code& ec)
            : basic_cbor_cursor2(std::allocator_arg, Allocator(),
                                std::forward<Sourceable>(source), 
                                cbor_decode_options(), 
                                ec)
        {
        }

        template <class Sourceable>
        basic_cbor_cursor2(Sourceable&& source, 
                          const cbor_decode_options& options,
                          std::error_code& ec)
            : basic_cbor_cursor2(std::allocator_arg, Allocator(),
                                std::forward<Sourceable>(source), 
                                options, 
                                ec)
        {
        }

        template <class Sourceable>
        basic_cbor_cursor2(std::allocator_arg_t, const Allocator& alloc, 
                          Sourceable&& source,
                          const cbor_decode_options& options,
                          std::error_code& ec)
           : parser_(std::forward<Sourceable>(source), options, alloc), 
             cursor_visitor_(accept_all),
             eof_(false)
        {
            if (!done())
            {
                next(ec);
            }
        }

        void reset()
        {
            parser_.reset();
            cursor_visitor_.reset();
            eof_ = false;
            if (!done())
            {
                next();
            }
        }

        template <class Sourceable>
        void reset(Sourceable&& source)
        {
            parser_.reset(std::forward<Sourceable>(source));
            cursor_visitor_.reset();
            eof_ = false;
            if (!done())
            {
                next();
            }
        }

        void reset(std::error_code& ec)
        {
            parser_.reset();
            cursor_visitor_.reset();
            eof_ = false;
            if (!done())
            {
                next(ec);
            }
        }

        template <class Sourceable>
        void reset(Sourceable&& source, std::error_code& ec)
        {
            parser_.reset(std::forward<Sourceable>(source));
            cursor_visitor_.reset();
            eof_ = false;
            if (!done())
            {
                next(ec);
            }
        }

        bool done() const override
        {
            return parser_.done();
        }

        bool is_typed_array() const
        {
            return cursor_visitor_.is_typed_array();
        }

        const staj2_event& current() const override
        {
            return cursor_visitor_.event();
        }

        void read_to(basic_json_visitor2<char_type>& visitor) override
        {
            std::error_code ec;
            read_to(visitor, ec);
            if (ec)
            {
                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
            }
        }

        void read_to(basic_json_visitor2<char_type>& visitor,
                     std::error_code& ec) override
        {
            if (cursor_visitor_.dump(visitor, *this, ec))
            {
                read_next(visitor, ec);
            }
        }

        void next() override
        {
            std::error_code ec;
            next(ec);
            if (ec)
            {
                JSONCONS_THROW(ser_error(ec,parser_.line(),parser_.column()));
            }
        }

        void next(std::error_code& ec) override
        {
            read_next(ec);
        }

        const ser_context& context() const override
        {
            return *this;
        }

        bool eof() const
        {
            return eof_;
        }

        std::size_t line() const override
        {
            return parser_.line();
        }

        std::size_t column() const override
        {
            return parser_.column();
        }

        friend
        staj2_filter_view operator|(basic_cbor_cursor2& cursor, 
                                   std::function<bool(const staj2_event&, const ser_context&)> pred)
        {
            return staj2_filter_view(cursor, pred);
        }

    private:
        static bool accept_all(const staj2_event&, const ser_context&) 
        {
            return true;
        }

        void read_next(std::error_code& ec)
        {
            if (cursor_visitor_.in_available())
            {
                cursor_visitor_.send_available(ec);
            }
            else
            {
                parser_.restart();
                while (!parser_.stopped())
                {
                    parser_.parse(cursor_visitor_, ec);
                    if (ec) return;
                }
            }
        }

        void read_next(basic_json_visitor2<char_type>& visitor, std::error_code& ec)
        {
            parser_.restart();
            while (!parser_.stopped())
            {
                parser_.parse(visitor, ec);
                if (ec)
                {
                    return;
                }
            }
        }
    };

    using cbor_stream_cursor2 = basic_cbor_cursor2<jsoncons::binary_stream_source>;
    using cbor_bytes_cursor2 = basic_cbor_cursor2<jsoncons::bytes_source>;

} // namespace cbor
} // namespace jsoncons

#endif