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
|
// Copyright 2015 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_JSON_READER_HPP
#define JSONCONS_JSON_READER_HPP
#include <memory>
#include <string>
#include <sstream>
#include <vector>
#include <istream>
#include <cstdlib>
#include <stdexcept>
#include <system_error>
#include "jsoncons/jsoncons.hpp"
#include "jsoncons/json_input_handler.hpp"
#include "jsoncons/parse_error_handler.hpp"
#include "jsoncons/json_parser.hpp"
namespace jsoncons {
template<typename CharT>
class basic_json_reader
{
static const size_t default_max_buffer_length = 16384;
basic_json_parser<CharT> parser_;
std::basic_istream<CharT> *is_;
basic_parse_error_handler<CharT> *err_handler_;
bool eof_;
std::vector<CharT> buffer_;
size_t buffer_length_;
size_t buffer_capacity_;
size_t index_;
public:
basic_json_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler)
: parser_(handler),
is_(std::addressof(is)),
err_handler_(std::addressof(basic_default_parse_error_handler<CharT>::instance())),
eof_(false),
buffer_length_(0),
buffer_capacity_(default_max_buffer_length),
index_(0)
{
buffer_.resize(buffer_capacity_);
}
basic_json_reader(std::basic_istream<CharT>& is,
basic_json_input_handler<CharT>& handler,
basic_parse_error_handler<CharT>& err_handler)
: parser_(handler,err_handler),
is_(std::addressof(is)),
err_handler_(std::addressof(err_handler)),
eof_(false),
buffer_length_(0),
buffer_capacity_(default_max_buffer_length),
index_(0)
{
buffer_.resize(buffer_capacity_);
}
size_t buffer_capacity() const
{
return buffer_capacity_;
}
void buffer_capacity(size_t capacity)
{
buffer_capacity_ = capacity;
buffer_.resize(buffer_capacity_);
}
size_t max_nesting_depth() const
{
return parser_.max_nesting_depth();
}
void max_nesting_depth(size_t depth)
{
parser_.max_nesting_depth(depth);
}
void read_next()
{
parser_.begin_parse();
while (!eof_ && !parser_.done())
{
if (!(index_ < buffer_length_))
{
if (!is_->eof())
{
is_->read(buffer_.data(), buffer_capacity_);
buffer_length_ = static_cast<size_t>(is_->gcount());
if (buffer_length_ == 0)
{
eof_ = true;
}
index_ = 0;
}
else
{
eof_ = true;
}
}
if (!eof_)
{
parser_.parse(buffer_.data(),index_,buffer_length_);
index_ = parser_.index();
}
}
parser_.end_parse();
}
void check_done()
{
while (!eof_)
{
if (!(index_ < buffer_length_))
{
if (!is_->eof())
{
is_->read(buffer_.data(), buffer_capacity_);
buffer_length_ = static_cast<size_t>(is_->gcount());
if (buffer_length_ == 0)
{
eof_ = true;
}
index_ = 0;
}
else
{
eof_ = true;
}
}
if (!eof_)
{
parser_.check_done(buffer_.data(),index_,buffer_length_);
index_ = parser_.index();
}
}
}
bool eof() const
{
return eof_;
}
#if !defined(JSONCONS_NO_DEPRECATED)
void read()
{
read_next();
}
size_t max_depth() const
{
return parser_.max_nesting_depth();
}
void max_depth(size_t depth)
{
parser_.max_nesting_depth(depth);
}
#endif
};
typedef basic_json_reader<char> json_reader;
typedef basic_json_reader<wchar_t> wjson_reader;
}
#endif
|
