summaryrefslogtreecommitdiff
path: root/vendor/github.com/mailru/easyjson/jwriter/writer.go
blob: b9ed7ccaa8bcf7eec4fbfb55fe4ab5cb57890884 (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
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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
// Package jwriter contains a JSON writer.
package jwriter

import (
	"io"
	"strconv"
	"unicode/utf8"

	"github.com/mailru/easyjson/buffer"
)

// Flags describe various encoding options. The behavior may be actually implemented in the encoder, but
// Flags field in Writer is used to set and pass them around.
type Flags int

const (
	NilMapAsEmpty   Flags = 1 << iota // Encode nil map as '{}' rather than 'null'.
	NilSliceAsEmpty                   // Encode nil slice as '[]' rather than 'null'.
)

// Writer is a JSON writer.
type Writer struct {
	Flags Flags

	Error        error
	Buffer       buffer.Buffer
	NoEscapeHTML bool
}

// Size returns the size of the data that was written out.
func (w *Writer) Size() int {
	return w.Buffer.Size()
}

// DumpTo outputs the data to given io.Writer, resetting the buffer.
func (w *Writer) DumpTo(out io.Writer) (written int, err error) {
	return w.Buffer.DumpTo(out)
}

// BuildBytes returns writer data as a single byte slice. You can optionally provide one byte slice
// as argument that it will try to reuse.
func (w *Writer) BuildBytes(reuse ...[]byte) ([]byte, error) {
	if w.Error != nil {
		return nil, w.Error
	}

	return w.Buffer.BuildBytes(reuse...), nil
}

// ReadCloser returns an io.ReadCloser that can be used to read the data.
// ReadCloser also resets the buffer.
func (w *Writer) ReadCloser() (io.ReadCloser, error) {
	if w.Error != nil {
		return nil, w.Error
	}

	return w.Buffer.ReadCloser(), nil
}

// RawByte appends raw binary data to the buffer.
func (w *Writer) RawByte(c byte) {
	w.Buffer.AppendByte(c)
}

// RawByte appends raw binary data to the buffer.
func (w *Writer) RawString(s string) {
	w.Buffer.AppendString(s)
}

// Raw appends raw binary data to the buffer or sets the error if it is given. Useful for
// calling with results of MarshalJSON-like functions.
func (w *Writer) Raw(data []byte, err error) {
	switch {
	case w.Error != nil:
		return
	case err != nil:
		w.Error = err
	case len(data) > 0:
		w.Buffer.AppendBytes(data)
	default:
		w.RawString("null")
	}
}

// RawText encloses raw binary data in quotes and appends in to the buffer.
// Useful for calling with results of MarshalText-like functions.
func (w *Writer) RawText(data []byte, err error) {
	switch {
	case w.Error != nil:
		return
	case err != nil:
		w.Error = err
	case len(data) > 0:
		w.String(string(data))
	default:
		w.RawString("null")
	}
}

// Base64Bytes appends data to the buffer after base64 encoding it
func (w *Writer) Base64Bytes(data []byte) {
	if data == nil {
		w.Buffer.AppendString("null")
		return
	}
	w.Buffer.AppendByte('"')
	w.base64(data)
	w.Buffer.AppendByte('"')
}

func (w *Writer) Uint8(n uint8) {
	w.Buffer.EnsureSpace(3)
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
}

func (w *Writer) Uint16(n uint16) {
	w.Buffer.EnsureSpace(5)
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
}

func (w *Writer) Uint32(n uint32) {
	w.Buffer.EnsureSpace(10)
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
}

func (w *Writer) Uint(n uint) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
}

func (w *Writer) Uint64(n uint64) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
}

func (w *Writer) Int8(n int8) {
	w.Buffer.EnsureSpace(4)
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
}

func (w *Writer) Int16(n int16) {
	w.Buffer.EnsureSpace(6)
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
}

func (w *Writer) Int32(n int32) {
	w.Buffer.EnsureSpace(11)
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
}

func (w *Writer) Int(n int) {
	w.Buffer.EnsureSpace(21)
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
}

func (w *Writer) Int64(n int64) {
	w.Buffer.EnsureSpace(21)
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
}

func (w *Writer) Uint8Str(n uint8) {
	w.Buffer.EnsureSpace(3)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Uint16Str(n uint16) {
	w.Buffer.EnsureSpace(5)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Uint32Str(n uint32) {
	w.Buffer.EnsureSpace(10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) UintStr(n uint) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Uint64Str(n uint64) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, n, 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) UintptrStr(n uintptr) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendUint(w.Buffer.Buf, uint64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Int8Str(n int8) {
	w.Buffer.EnsureSpace(4)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Int16Str(n int16) {
	w.Buffer.EnsureSpace(6)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Int32Str(n int32) {
	w.Buffer.EnsureSpace(11)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) IntStr(n int) {
	w.Buffer.EnsureSpace(21)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, int64(n), 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Int64Str(n int64) {
	w.Buffer.EnsureSpace(21)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendInt(w.Buffer.Buf, n, 10)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Float32(n float32) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 32)
}

func (w *Writer) Float32Str(n float32) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 32)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Float64(n float64) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, n, 'g', -1, 64)
}

func (w *Writer) Float64Str(n float64) {
	w.Buffer.EnsureSpace(20)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
	w.Buffer.Buf = strconv.AppendFloat(w.Buffer.Buf, float64(n), 'g', -1, 64)
	w.Buffer.Buf = append(w.Buffer.Buf, '"')
}

func (w *Writer) Bool(v bool) {
	w.Buffer.EnsureSpace(5)
	if v {
		w.Buffer.Buf = append(w.Buffer.Buf, "true"...)
	} else {
		w.Buffer.Buf = append(w.Buffer.Buf, "false"...)
	}
}

const chars = "0123456789abcdef"

func isNotEscapedSingleChar(c byte, escapeHTML bool) bool {
	// Note: might make sense to use a table if there are more chars to escape. With 4 chars
	// it benchmarks the same.
	if escapeHTML {
		return c != '<' && c != '>' && c != '&' && c != '\\' && c != '"' && c >= 0x20 && c < utf8.RuneSelf
	} else {
		return c != '\\' && c != '"' && c >= 0x20 && c < utf8.RuneSelf
	}
}

func (w *Writer) String(s string) {
	w.Buffer.AppendByte('"')

	// Portions of the string that contain no escapes are appended as
	// byte slices.

	p := 0 // last non-escape symbol

	for i := 0; i < len(s); {
		c := s[i]

		if isNotEscapedSingleChar(c, !w.NoEscapeHTML) {
			// single-width character, no escaping is required
			i++
			continue
		} else if c < utf8.RuneSelf {
			// single-with character, need to escape
			w.Buffer.AppendString(s[p:i])
			switch c {
			case '\t':
				w.Buffer.AppendString(`\t`)
			case '\r':
				w.Buffer.AppendString(`\r`)
			case '\n':
				w.Buffer.AppendString(`\n`)
			case '\\':
				w.Buffer.AppendString(`\\`)
			case '"':
				w.Buffer.AppendString(`\"`)
			default:
				w.Buffer.AppendString(`\u00`)
				w.Buffer.AppendByte(chars[c>>4])
				w.Buffer.AppendByte(chars[c&0xf])
			}

			i++
			p = i
			continue
		}

		// broken utf
		runeValue, runeWidth := utf8.DecodeRuneInString(s[i:])
		if runeValue == utf8.RuneError && runeWidth == 1 {
			w.Buffer.AppendString(s[p:i])
			w.Buffer.AppendString(`\ufffd`)
			i++
			p = i
			continue
		}

		// jsonp stuff - tab separator and line separator
		if runeValue == '\u2028' || runeValue == '\u2029' {
			w.Buffer.AppendString(s[p:i])
			w.Buffer.AppendString(`\u202`)
			w.Buffer.AppendByte(chars[runeValue&0xf])
			i += runeWidth
			p = i
			continue
		}
		i += runeWidth
	}
	w.Buffer.AppendString(s[p:])
	w.Buffer.AppendByte('"')
}

const encode = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
const padChar = '='

func (w *Writer) base64(in []byte) {

	if len(in) == 0 {
		return
	}

	w.Buffer.EnsureSpace(((len(in)-1)/3 + 1) * 4)

	si := 0
	n := (len(in) / 3) * 3

	for si < n {
		// Convert 3x 8bit source bytes into 4 bytes
		val := uint(in[si+0])<<16 | uint(in[si+1])<<8 | uint(in[si+2])

		w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>18&0x3F], encode[val>>12&0x3F], encode[val>>6&0x3F], encode[val&0x3F])

		si += 3
	}

	remain := len(in) - si
	if remain == 0 {
		return
	}

	// Add the remaining small block
	val := uint(in[si+0]) << 16
	if remain == 2 {
		val |= uint(in[si+1]) << 8
	}

	w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>18&0x3F], encode[val>>12&0x3F])

	switch remain {
	case 2:
		w.Buffer.Buf = append(w.Buffer.Buf, encode[val>>6&0x3F], byte(padChar))
	case 1:
		w.Buffer.Buf = append(w.Buffer.Buf, byte(padChar), byte(padChar))
	}
}