aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/github.com/json-iterator/go/stream.go
blob: 23d8a3ad6b1269c4396e45430a67521493915e2e (plain) (blame)
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
package jsoniter

import (
	"io"
)

// stream is a io.Writer like object, with JSON specific write functions.
// Error is not returned as return value, but stored as Error member on this stream instance.
type Stream struct {
	cfg        *frozenConfig
	out        io.Writer
	buf        []byte
	Error      error
	indention  int
	Attachment interface{} // open for customized encoder
}

// NewStream create new stream instance.
// cfg can be jsoniter.ConfigDefault.
// out can be nil if write to internal buffer.
// bufSize is the initial size for the internal buffer in bytes.
func NewStream(cfg API, out io.Writer, bufSize int) *Stream {
	return &Stream{
		cfg:       cfg.(*frozenConfig),
		out:       out,
		buf:       make([]byte, 0, bufSize),
		Error:     nil,
		indention: 0,
	}
}

// Pool returns a pool can provide more stream with same configuration
func (stream *Stream) Pool() StreamPool {
	return stream.cfg
}

// Reset reuse this stream instance by assign a new writer
func (stream *Stream) Reset(out io.Writer) {
	stream.out = out
	stream.buf = stream.buf[:0]
}

// Available returns how many bytes are unused in the buffer.
func (stream *Stream) Available() int {
	return cap(stream.buf) - len(stream.buf)
}

// Buffered returns the number of bytes that have been written into the current buffer.
func (stream *Stream) Buffered() int {
	return len(stream.buf)
}

// Buffer if writer is nil, use this method to take the result
func (stream *Stream) Buffer() []byte {
	return stream.buf
}

// SetBuffer allows to append to the internal buffer directly
func (stream *Stream) SetBuffer(buf []byte) {
	stream.buf = buf
}

// Write writes the contents of p into the buffer.
// It returns the number of bytes written.
// If nn < len(p), it also returns an error explaining
// why the write is short.
func (stream *Stream) Write(p []byte) (nn int, err error) {
	stream.buf = append(stream.buf, p...)
	if stream.out != nil {
		nn, err = stream.out.Write(stream.buf)
		stream.buf = stream.buf[nn:]
		return
	}
	return len(p), nil
}

// WriteByte writes a single byte.
func (stream *Stream) writeByte(c byte) {
	stream.buf = append(stream.buf, c)
}

func (stream *Stream) writeTwoBytes(c1 byte, c2 byte) {
	stream.buf = append(stream.buf, c1, c2)
}

func (stream *Stream) writeThreeBytes(c1 byte, c2 byte, c3 byte) {
	stream.buf = append(stream.buf, c1, c2, c3)
}

func (stream *Stream) writeFourBytes(c1 byte, c2 byte, c3 byte, c4 byte) {
	stream.buf = append(stream.buf, c1, c2, c3, c4)
}

func (stream *Stream) writeFiveBytes(c1 byte, c2 byte, c3 byte, c4 byte, c5 byte) {
	stream.buf = append(stream.buf, c1, c2, c3, c4, c5)
}

// Flush writes any buffered data to the underlying io.Writer.
func (stream *Stream) Flush() error {
	if stream.out == nil {
		return nil
	}
	if stream.Error != nil {
		return stream.Error
	}
	_, err := stream.out.Write(stream.buf)
	if err != nil {
		if stream.Error == nil {
			stream.Error = err
		}
		return err
	}
	stream.buf = stream.buf[:0]
	return nil
}

// WriteRaw write string out without quotes, just like []byte
func (stream *Stream) WriteRaw(s string) {
	stream.buf = append(stream.buf, s...)
}

// WriteNil write null to stream
func (stream *Stream) WriteNil() {
	stream.writeFourBytes('n', 'u', 'l', 'l')
}

// WriteTrue write true to stream
func (stream *Stream) WriteTrue() {
	stream.writeFourBytes('t', 'r', 'u', 'e')
}

// WriteFalse write false to stream
func (stream *Stream) WriteFalse() {
	stream.writeFiveBytes('f', 'a', 'l', 's', 'e')
}

// WriteBool write true or false into stream
func (stream *Stream) WriteBool(val bool) {
	if val {
		stream.WriteTrue()
	} else {
		stream.WriteFalse()
	}
}

// WriteObjectStart write { with possible indention
func (stream *Stream) WriteObjectStart() {
	stream.indention += stream.cfg.indentionStep
	stream.writeByte('{')
	stream.writeIndention(0)
}

// WriteObjectField write "field": with possible indention
func (stream *Stream) WriteObjectField(field string) {
	stream.WriteString(field)
	if stream.indention > 0 {
		stream.writeTwoBytes(':', ' ')
	} else {
		stream.writeByte(':')
	}
}

// WriteObjectEnd write } with possible indention
func (stream *Stream) WriteObjectEnd() {
	stream.writeIndention(stream.cfg.indentionStep)
	stream.indention -= stream.cfg.indentionStep
	stream.writeByte('}')
}

// WriteEmptyObject write {}
func (stream *Stream) WriteEmptyObject() {
	stream.writeByte('{')
	stream.writeByte('}')
}

// WriteMore write , with possible indention
func (stream *Stream) WriteMore() {
	stream.writeByte(',')
	stream.writeIndention(0)
}

// WriteArrayStart write [ with possible indention
func (stream *Stream) WriteArrayStart() {
	stream.indention += stream.cfg.indentionStep
	stream.writeByte('[')
	stream.writeIndention(0)
}

// WriteEmptyArray write []
func (stream *Stream) WriteEmptyArray() {
	stream.writeTwoBytes('[', ']')
}

// WriteArrayEnd write ] with possible indention
func (stream *Stream) WriteArrayEnd() {
	stream.writeIndention(stream.cfg.indentionStep)
	stream.indention -= stream.cfg.indentionStep
	stream.writeByte(']')
}

func (stream *Stream) writeIndention(delta int) {
	if stream.indention == 0 {
		return
	}
	stream.writeByte('\n')
	toWrite := stream.indention - delta
	for i := 0; i < toWrite; i++ {
		stream.buf = append(stream.buf, ' ')
	}
}