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
266
267
|
// Copyright 2013-2016 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_DESERIALIZER_HPP
#define JSONCONS_JSON_DESERIALIZER_HPP
#include <string>
#include <sstream>
#include <vector>
#include <istream>
#include <cstdlib>
#include <memory>
#include "jsoncons/jsoncons.hpp"
#include "jsoncons/json_input_handler.hpp"
namespace jsoncons {
template <class JsonT>
class basic_json_deserializer : public basic_json_input_handler<typename JsonT::char_type>
{
static const int default_stack_size = 1000;
typedef typename JsonT::char_type char_type;
typedef typename JsonT::member_type member_type;
typedef typename JsonT::string_type string_type;
typedef typename string_type::allocator_type string_allocator;
typedef typename JsonT::allocator_type allocator_type;
typedef typename JsonT::array array;
typedef typename array::allocator_type array_allocator;
typedef typename JsonT::object object;
typedef typename object::allocator_type object_allocator;
typedef typename JsonT::value_type value_type;
string_allocator sa_;
object_allocator oa_;
array_allocator aa_;
JsonT result_;
size_t top_;
struct stack_item
{
string_type name_;
value_type value_;
};
std::vector<stack_item> stack_;
std::vector<size_t> stack2_;
bool is_valid_;
public:
basic_json_deserializer(const string_allocator& sa = string_allocator(),
const allocator_type& allocator = allocator_type())
: sa_(sa),
oa_(allocator),
aa_(allocator),
top_(0),
stack_(default_stack_size),
stack2_(),
is_valid_(true) // initial json value is an empty object
{
stack2_.reserve(100);
}
bool is_valid() const
{
return is_valid_;
}
JsonT get_result()
{
is_valid_ = false;
return std::move(result_);
}
#if !defined(JSONCONS_NO_DEPRECATED)
JsonT& root()
{
return result_;
}
#endif
private:
void push_initial()
{
top_ = 0;
if (top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void pop_initial()
{
JSONCONS_ASSERT(top_ == 1);
result_.swap(stack_[0].value_);
--top_;
}
void push_object()
{
stack2_.push_back(top_);
stack_[top_].value_ = object(oa_);
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void pop_object()
{
stack2_.pop_back();
JSONCONS_ASSERT(top_ > 0);
}
void push_array()
{
stack2_.push_back(top_);
stack_[top_].value_ = array(aa_);
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void pop_array()
{
stack2_.pop_back();
JSONCONS_ASSERT(top_ > 0);
}
void do_begin_json() override
{
is_valid_ = false;
push_initial();
}
void do_end_json() override
{
is_valid_ = true;
pop_initial();
}
void do_begin_object(const basic_parsing_context<char_type>&) override
{
push_object();
}
void do_end_object(const basic_parsing_context<char_type>&) override
{
end_structure();
pop_object();
}
void do_begin_array(const basic_parsing_context<char_type>&) override
{
push_array();
}
void do_end_array(const basic_parsing_context<char_type>&) override
{
end_structure();
pop_array();
}
static member_type move_pair(stack_item&& val)
{
return member_type(std::move(val.name_),std::move(val.value_));
}
void end_structure()
{
JSONCONS_ASSERT(stack2_.size() > 0);
if (stack_[stack2_.back()].value_.is_object())
{
size_t count = top_ - (stack2_.back() + 1);
auto s = stack_.begin() + (stack2_.back()+1);
auto send = s + count;
stack_[stack2_.back()].value_.object_value().insert(
std::make_move_iterator(s),
std::make_move_iterator(send),
move_pair);
top_ -= count;
}
else
{
size_t count = top_ - (stack2_.back() + 1);
stack_[stack2_.back()].value_.resize(count);
auto s = stack_.begin() + (stack2_.back()+1);
auto dend = stack_[stack2_.back()].value_.elements().end();
for (auto it = stack_[stack2_.back()].value_.elements().begin();
it != dend; ++it, ++s)
{
*it = std::move(s->value_);
}
top_ -= count;
}
}
void do_name(const char_type* p, size_t length, const basic_parsing_context<char_type>&) override
{
stack_[top_].name_ = string_type(p,length,sa_);
}
void do_string_value(const char_type* p, size_t length, const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = JsonT(p,length,sa_);
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void do_integer_value(int64_t value, const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = value;
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void do_uinteger_value(uint64_t value, const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = value;
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void do_double_value(double value, uint8_t precision, const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = value_type(value,precision);
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void do_bool_value(bool value, const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = value;
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
void do_null_value(const basic_parsing_context<char_type>&) override
{
stack_[top_].value_ = null_type();
if (++top_ >= stack_.size())
{
stack_.resize(top_*2);
}
}
};
}
#endif
|
