blob: 146d51dcb95a9fb26eb329e3b43854cb83565116 (
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
|
// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License
#pragma once
#include <stdint.h>
#include "../Data/Encoding.hpp"
#include "../Data/JsonInteger.hpp"
#include "../Polyfills/attributes.hpp"
#include "../Serialization/FloatParts.hpp"
namespace ArduinoJson {
namespace Internals {
// Writes the JSON tokens to a Print implementation
// This class is used by:
// - JsonArray::writeTo()
// - JsonObject::writeTo()
// - JsonVariant::writeTo()
// Its derived by PrettyJsonWriter that overrides some members to add
// indentation.
template <typename Print>
class JsonWriter {
public:
explicit JsonWriter(Print &sink) : _sink(sink), _length(0) {}
// Returns the number of bytes sent to the Print implementation.
// This is very handy for implementations of printTo() that must return the
// number of bytes written.
size_t bytesWritten() const {
return _length;
}
void beginArray() {
writeRaw('[');
}
void endArray() {
writeRaw(']');
}
void beginObject() {
writeRaw('{');
}
void endObject() {
writeRaw('}');
}
void writeColon() {
writeRaw(':');
}
void writeComma() {
writeRaw(',');
}
void writeBoolean(bool value) {
writeRaw(value ? "true" : "false");
}
void writeString(const char *value) {
if (!value) {
writeRaw("null");
} else {
writeRaw('\"');
while (*value) writeChar(*value++);
writeRaw('\"');
}
}
void writeChar(char c) {
char specialChar = Encoding::escapeChar(c);
if (specialChar) {
writeRaw('\\');
writeRaw(specialChar);
} else {
writeRaw(c);
}
}
template <typename TFloat>
void writeFloat(TFloat value) {
if (isNaN(value)) return writeRaw("NaN");
if (value < 0.0) {
writeRaw('-');
value = -value;
}
if (isInfinity(value)) return writeRaw("Infinity");
FloatParts<TFloat> parts(value);
writeInteger(parts.integral);
if (parts.decimalPlaces) writeDecimals(parts.decimal, parts.decimalPlaces);
if (parts.exponent < 0) {
writeRaw("e-");
writeInteger(-parts.exponent);
}
if (parts.exponent > 0) {
writeRaw('e');
writeInteger(parts.exponent);
}
}
template <typename UInt>
void writeInteger(UInt value) {
char buffer[22];
char *end = buffer + sizeof(buffer) - 1;
char *ptr = end;
*ptr = 0;
do {
*--ptr = char(value % 10 + '0');
value = UInt(value / 10);
} while (value);
writeRaw(ptr);
}
void writeDecimals(uint32_t value, int8_t width) {
// buffer should be big enough for all digits, the dot and the null
// terminator
char buffer[16];
char *ptr = buffer + sizeof(buffer) - 1;
// write the string in reverse order
*ptr = 0;
while (width--) {
*--ptr = char(value % 10 + '0');
value /= 10;
}
*--ptr = '.';
// and dump it in the right order
writeRaw(ptr);
}
void writeRaw(const char *s) {
_length += _sink.print(s);
}
void writeRaw(char c) {
_length += _sink.print(c);
}
protected:
Print &_sink;
size_t _length;
private:
JsonWriter &operator=(const JsonWriter &); // cannot be assigned
};
}
}
|
