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
|
#include "libutil/json.hh"
#include <cstring>
#include <iomanip>
namespace nix {
void toJSON(std::ostream& str, const char* start, const char* end) {
str << '"';
for (auto i = start; i != end; i++) {
if (*i == '\"' || *i == '\\') {
str << '\\' << *i;
} else if (*i == '\n') {
str << "\\n";
} else if (*i == '\r') {
str << "\\r";
} else if (*i == '\t') {
str << "\\t";
} else if (*i >= 0 && *i < 32) {
str << "\\u" << std::setfill('0') << std::setw(4) << std::hex
<< static_cast<uint16_t>(*i) << std::dec;
} else {
str << *i;
}
}
str << '"';
}
void toJSON(std::ostream& str, const char* s) {
if (s == nullptr) {
str << "null";
} else {
toJSON(str, s, s + strlen(s));
}
}
template <>
void toJSON<int>(std::ostream& str, const int& n) {
str << n;
}
template <>
void toJSON<unsigned int>(std::ostream& str, const unsigned int& n) {
str << n;
}
template <>
void toJSON<long>(std::ostream& str, const long& n) {
str << n;
}
template <>
void toJSON<unsigned long>(std::ostream& str, const unsigned long& n) {
str << n;
}
template <>
void toJSON<long long>(std::ostream& str, const long long& n) {
str << n;
}
template <>
void toJSON<unsigned long long>(std::ostream& str,
const unsigned long long& n) {
str << n;
}
template <>
void toJSON<float>(std::ostream& str, const float& n) {
str << n;
}
template <>
void toJSON<double>(std::ostream& str, const double& n) {
str << n;
}
template <>
void toJSON<std::string>(std::ostream& str, const std::string& s) {
toJSON(str, s.c_str(), s.c_str() + s.size());
}
template <>
void toJSON<bool>(std::ostream& str, const bool& b) {
str << (b ? "true" : "false");
}
template <>
void toJSON<std::nullptr_t>(std::ostream& str, const std::nullptr_t& b) {
str << "null";
}
JSONWriter::JSONWriter(std::ostream& str, bool indent)
: state(new JSONState(str, indent)) {
state->stack++;
}
JSONWriter::JSONWriter(JSONState* state) : state(state) { state->stack++; }
JSONWriter::~JSONWriter() {
if (state != nullptr) {
assertActive();
state->stack--;
if (state->stack == 0) {
delete state;
}
}
}
void JSONWriter::comma() {
assertActive();
if (first) {
first = false;
} else {
state->str << ',';
}
if (state->indent) {
indent();
}
}
void JSONWriter::indent() {
state->str << '\n' << std::string(state->depth * 2, ' ');
}
void JSONList::open() {
state->depth++;
state->str << '[';
}
JSONList::~JSONList() {
state->depth--;
if (state->indent && !first) {
indent();
}
state->str << "]";
}
JSONList JSONList::list() {
comma();
return JSONList(state);
}
JSONObject JSONList::object() {
comma();
return JSONObject(state);
}
JSONPlaceholder JSONList::placeholder() {
comma();
return JSONPlaceholder(state);
}
void JSONObject::open() {
state->depth++;
state->str << '{';
}
JSONObject::~JSONObject() {
if (state != nullptr) {
state->depth--;
if (state->indent && !first) {
indent();
}
state->str << "}";
}
}
void JSONObject::attr(const std::string& s) {
comma();
toJSON(state->str, s);
state->str << ':';
if (state->indent) {
state->str << ' ';
}
}
JSONList JSONObject::list(const std::string& name) {
attr(name);
return JSONList(state);
}
JSONObject JSONObject::object(const std::string& name) {
attr(name);
return JSONObject(state);
}
JSONPlaceholder JSONObject::placeholder(const std::string& name) {
attr(name);
return JSONPlaceholder(state);
}
JSONList JSONPlaceholder::list() {
assertValid();
first = false;
return JSONList(state);
}
JSONObject JSONPlaceholder::object() {
assertValid();
first = false;
return JSONObject(state);
}
} // namespace nix
|
