aboutsummaryrefslogtreecommitdiff
path: root/vendor/gopkg.in/yaml.v3/encode.go
blob: de9e72a3e638d166e96ceab3d77ce59afe6e6f8a (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
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
//
// Copyright (c) 2011-2019 Canonical Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package yaml

import (
	"encoding"
	"fmt"
	"io"
	"reflect"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"
)

type encoder struct {
	emitter  yaml_emitter_t
	event    yaml_event_t
	out      []byte
	flow     bool
	indent   int
	doneInit bool
}

func newEncoder() *encoder {
	e := &encoder{}
	yaml_emitter_initialize(&e.emitter)
	yaml_emitter_set_output_string(&e.emitter, &e.out)
	yaml_emitter_set_unicode(&e.emitter, true)
	return e
}

func newEncoderWithWriter(w io.Writer) *encoder {
	e := &encoder{}
	yaml_emitter_initialize(&e.emitter)
	yaml_emitter_set_output_writer(&e.emitter, w)
	yaml_emitter_set_unicode(&e.emitter, true)
	return e
}

func (e *encoder) init() {
	if e.doneInit {
		return
	}
	if e.indent == 0 {
		e.indent = 4
	}
	e.emitter.best_indent = e.indent
	yaml_stream_start_event_initialize(&e.event, yaml_UTF8_ENCODING)
	e.emit()
	e.doneInit = true
}

func (e *encoder) finish() {
	e.emitter.open_ended = false
	yaml_stream_end_event_initialize(&e.event)
	e.emit()
}

func (e *encoder) destroy() {
	yaml_emitter_delete(&e.emitter)
}

func (e *encoder) emit() {
	// This will internally delete the e.event value.
	e.must(yaml_emitter_emit(&e.emitter, &e.event))
}

func (e *encoder) must(ok bool) {
	if !ok {
		msg := e.emitter.problem
		if msg == "" {
			msg = "unknown problem generating YAML content"
		}
		failf("%s", msg)
	}
}

func (e *encoder) marshalDoc(tag string, in reflect.Value) {
	e.init()
	var node *Node
	if in.IsValid() {
		node, _ = in.Interface().(*Node)
	}
	if node != nil && node.Kind == DocumentNode {
		e.nodev(in)
	} else {
		yaml_document_start_event_initialize(&e.event, nil, nil, true)
		e.emit()
		e.marshal(tag, in)
		yaml_document_end_event_initialize(&e.event, true)
		e.emit()
	}
}

func (e *encoder) marshal(tag string, in reflect.Value) {
	tag = shortTag(tag)
	if !in.IsValid() || in.Kind() == reflect.Ptr && in.IsNil() {
		e.nilv()
		return
	}
	iface := in.Interface()
	switch value := iface.(type) {
	case *Node:
		e.nodev(in)
		return
	case Node:
		if !in.CanAddr() {
			var n = reflect.New(in.Type()).Elem()
			n.Set(in)
			in = n
		}
		e.nodev(in.Addr())
		return
	case time.Time:
		e.timev(tag, in)
		return
	case *time.Time:
		e.timev(tag, in.Elem())
		return
	case time.Duration:
		e.stringv(tag, reflect.ValueOf(value.String()))
		return
	case Marshaler:
		v, err := value.MarshalYAML()
		if err != nil {
			fail(err)
		}
		if v == nil {
			e.nilv()
			return
		}
		e.marshal(tag, reflect.ValueOf(v))
		return
	case encoding.TextMarshaler:
		text, err := value.MarshalText()
		if err != nil {
			fail(err)
		}
		in = reflect.ValueOf(string(text))
	case nil:
		e.nilv()
		return
	}
	switch in.Kind() {
	case reflect.Interface:
		e.marshal(tag, in.Elem())
	case reflect.Map:
		e.mapv(tag, in)
	case reflect.Ptr:
		e.marshal(tag, in.Elem())
	case reflect.Struct:
		e.structv(tag, in)
	case reflect.Slice, reflect.Array:
		e.slicev(tag, in)
	case reflect.String:
		e.stringv(tag, in)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		e.intv(tag, in)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		e.uintv(tag, in)
	case reflect.Float32, reflect.Float64:
		e.floatv(tag, in)
	case reflect.Bool:
		e.boolv(tag, in)
	default:
		panic("cannot marshal type: " + in.Type().String())
	}
}

func (e *encoder) mapv(tag string, in reflect.Value) {
	e.mappingv(tag, func() {
		keys := keyList(in.MapKeys())
		sort.Sort(keys)
		for _, k := range keys {
			e.marshal("", k)
			e.marshal("", in.MapIndex(k))
		}
	})
}

func (e *encoder) fieldByIndex(v reflect.Value, index []int) (field reflect.Value) {
	for _, num := range index {
		for {
			if v.Kind() == reflect.Ptr {
				if v.IsNil() {
					return reflect.Value{}
				}
				v = v.Elem()
				continue
			}
			break
		}
		v = v.Field(num)
	}
	return v
}

func (e *encoder) structv(tag string, in reflect.Value) {
	sinfo, err := getStructInfo(in.Type())
	if err != nil {
		panic(err)
	}
	e.mappingv(tag, func() {
		for _, info := range sinfo.FieldsList {
			var value reflect.Value
			if info.Inline == nil {
				value = in.Field(info.Num)
			} else {
				value = e.fieldByIndex(in, info.Inline)
				if !value.IsValid() {
					continue
				}
			}
			if info.OmitEmpty && isZero(value) {
				continue
			}
			e.marshal("", reflect.ValueOf(info.Key))
			e.flow = info.Flow
			e.marshal("", value)
		}
		if sinfo.InlineMap >= 0 {
			m := in.Field(sinfo.InlineMap)
			if m.Len() > 0 {
				e.flow = false
				keys := keyList(m.MapKeys())
				sort.Sort(keys)
				for _, k := range keys {
					if _, found := sinfo.FieldsMap[k.String()]; found {
						panic(fmt.Sprintf("cannot have key %q in inlined map: conflicts with struct field", k.String()))
					}
					e.marshal("", k)
					e.flow = false
					e.marshal("", m.MapIndex(k))
				}
			}
		}
	})
}

func (e *encoder) mappingv(tag string, f func()) {
	implicit := tag == ""
	style := yaml_BLOCK_MAPPING_STYLE
	if e.flow {
		e.flow = false
		style = yaml_FLOW_MAPPING_STYLE
	}
	yaml_mapping_start_event_initialize(&e.event, nil, []byte(tag), implicit, style)
	e.emit()
	f()
	yaml_mapping_end_event_initialize(&e.event)
	e.emit()
}

func (e *encoder) slicev(tag string, in reflect.Value) {
	implicit := tag == ""
	style := yaml_BLOCK_SEQUENCE_STYLE
	if e.flow {
		e.flow = false
		style = yaml_FLOW_SEQUENCE_STYLE
	}
	e.must(yaml_sequence_start_event_initialize(&e.event, nil, []byte(tag), implicit, style))
	e.emit()
	n := in.Len()
	for i := 0; i < n; i++ {
		e.marshal("", in.Index(i))
	}
	e.must(yaml_sequence_end_event_initialize(&e.event))
	e.emit()
}

// isBase60 returns whether s is in base 60 notation as defined in YAML 1.1.
//
// The base 60 float notation in YAML 1.1 is a terrible idea and is unsupported
// in YAML 1.2 and by this package, but these should be marshalled quoted for
// the time being for compatibility with other parsers.
func isBase60Float(s string) (result bool) {
	// Fast path.
	if s == "" {
		return false
	}
	c := s[0]
	if !(c == '+' || c == '-' || c >= '0' && c <= '9') || strings.IndexByte(s, ':') < 0 {
		return false
	}
	// Do the full match.
	return base60float.MatchString(s)
}

// From http://yaml.org/type/float.html, except the regular expression there
// is bogus. In practice parsers do not enforce the "\.[0-9_]*" suffix.
var base60float = regexp.MustCompile(`^[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+(?:\.[0-9_]*)?$`)

// isOldBool returns whether s is bool notation as defined in YAML 1.1.
//
// We continue to force strings that YAML 1.1 would interpret as booleans to be
// rendered as quotes strings so that the marshalled output valid for YAML 1.1
// parsing.
func isOldBool(s string) (result bool) {
	switch s {
	case "y", "Y", "yes", "Yes", "YES", "on", "On", "ON",
		"n", "N", "no", "No", "NO", "off", "Off", "OFF":
		return true
	default:
		return false
	}
}

func (e *encoder) stringv(tag string, in reflect.Value) {
	var style yaml_scalar_style_t
	s := in.String()
	canUsePlain := true
	switch {
	case !utf8.ValidString(s):
		if tag == binaryTag {
			failf("explicitly tagged !!binary data must be base64-encoded")
		}
		if tag != "" {
			failf("cannot marshal invalid UTF-8 data as %s", shortTag(tag))
		}
		// It can't be encoded directly as YAML so use a binary tag
		// and encode it as base64.
		tag = binaryTag
		s = encodeBase64(s)
	case tag == "":
		// Check to see if it would resolve to a specific
		// tag when encoded unquoted. If it doesn't,
		// there's no need to quote it.
		rtag, _ := resolve("", s)
		canUsePlain = rtag == strTag && !(isBase60Float(s) || isOldBool(s))
	}
	// Note: it's possible for user code to emit invalid YAML
	// if they explicitly specify a tag and a string containing
	// text that's incompatible with that tag.
	switch {
	case strings.Contains(s, "\n"):
		if e.flow {
			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
		} else {
			style = yaml_LITERAL_SCALAR_STYLE
		}
	case canUsePlain:
		style = yaml_PLAIN_SCALAR_STYLE
	default:
		style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
	}
	e.emitScalar(s, "", tag, style, nil, nil, nil, nil)
}

func (e *encoder) boolv(tag string, in reflect.Value) {
	var s string
	if in.Bool() {
		s = "true"
	} else {
		s = "false"
	}
	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) intv(tag string, in reflect.Value) {
	s := strconv.FormatInt(in.Int(), 10)
	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) uintv(tag string, in reflect.Value) {
	s := strconv.FormatUint(in.Uint(), 10)
	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) timev(tag string, in reflect.Value) {
	t := in.Interface().(time.Time)
	s := t.Format(time.RFC3339Nano)
	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) floatv(tag string, in reflect.Value) {
	// Issue #352: When formatting, use the precision of the underlying value
	precision := 64
	if in.Kind() == reflect.Float32 {
		precision = 32
	}

	s := strconv.FormatFloat(in.Float(), 'g', -1, precision)
	switch s {
	case "+Inf":
		s = ".inf"
	case "-Inf":
		s = "-.inf"
	case "NaN":
		s = ".nan"
	}
	e.emitScalar(s, "", tag, yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) nilv() {
	e.emitScalar("null", "", "", yaml_PLAIN_SCALAR_STYLE, nil, nil, nil, nil)
}

func (e *encoder) emitScalar(value, anchor, tag string, style yaml_scalar_style_t, head, line, foot, tail []byte) {
	// TODO Kill this function. Replace all initialize calls by their underlining Go literals.
	implicit := tag == ""
	if !implicit {
		tag = longTag(tag)
	}
	e.must(yaml_scalar_event_initialize(&e.event, []byte(anchor), []byte(tag), []byte(value), implicit, implicit, style))
	e.event.head_comment = head
	e.event.line_comment = line
	e.event.foot_comment = foot
	e.event.tail_comment = tail
	e.emit()
}

func (e *encoder) nodev(in reflect.Value) {
	e.node(in.Interface().(*Node), "")
}

func (e *encoder) node(node *Node, tail string) {
	// Zero nodes behave as nil.
	if node.Kind == 0 && node.IsZero() {
		e.nilv()
		return
	}

	// If the tag was not explicitly requested, and dropping it won't change the
	// implicit tag of the value, don't include it in the presentation.
	var tag = node.Tag
	var stag = shortTag(tag)
	var forceQuoting bool
	if tag != "" && node.Style&TaggedStyle == 0 {
		if node.Kind == ScalarNode {
			if stag == strTag && node.Style&(SingleQuotedStyle|DoubleQuotedStyle|LiteralStyle|FoldedStyle) != 0 {
				tag = ""
			} else {
				rtag, _ := resolve("", node.Value)
				if rtag == stag {
					tag = ""
				} else if stag == strTag {
					tag = ""
					forceQuoting = true
				}
			}
		} else {
			var rtag string
			switch node.Kind {
			case MappingNode:
				rtag = mapTag
			case SequenceNode:
				rtag = seqTag
			}
			if rtag == stag {
				tag = ""
			}
		}
	}

	switch node.Kind {
	case DocumentNode:
		yaml_document_start_event_initialize(&e.event, nil, nil, true)
		e.event.head_comment = []byte(node.HeadComment)
		e.emit()
		for _, node := range node.Content {
			e.node(node, "")
		}
		yaml_document_end_event_initialize(&e.event, true)
		e.event.foot_comment = []byte(node.FootComment)
		e.emit()

	case SequenceNode:
		style := yaml_BLOCK_SEQUENCE_STYLE
		if node.Style&FlowStyle != 0 {
			style = yaml_FLOW_SEQUENCE_STYLE
		}
		e.must(yaml_sequence_start_event_initialize(&e.event, []byte(node.Anchor), []byte(longTag(tag)), tag == "", style))
		e.event.head_comment = []byte(node.HeadComment)
		e.emit()
		for _, node := range node.Content {
			e.node(node, "")
		}
		e.must(yaml_sequence_end_event_initialize(&e.event))
		e.event.line_comment = []byte(node.LineComment)
		e.event.foot_comment = []byte(node.FootComment)
		e.emit()

	case MappingNode:
		style := yaml_BLOCK_MAPPING_STYLE
		if node.Style&FlowStyle != 0 {
			style = yaml_FLOW_MAPPING_STYLE
		}
		yaml_mapping_start_event_initialize(&e.event, []byte(node.Anchor), []byte(longTag(tag)), tag == "", style)
		e.event.tail_comment = []byte(tail)
		e.event.head_comment = []byte(node.HeadComment)
		e.emit()

		// The tail logic below moves the foot comment of prior keys to the following key,
		// since the value for each key may be a nested structure and the foot needs to be
		// processed only the entirety of the value is streamed. The last tail is processed
		// with the mapping end event.
		var tail string
		for i := 0; i+1 < len(node.Content); i += 2 {
			k := node.Content[i]
			foot := k.FootComment
			if foot != "" {
				kopy := *k
				kopy.FootComment = ""
				k = &kopy
			}
			e.node(k, tail)
			tail = foot

			v := node.Content[i+1]
			e.node(v, "")
		}

		yaml_mapping_end_event_initialize(&e.event)
		e.event.tail_comment = []byte(tail)
		e.event.line_comment = []byte(node.LineComment)
		e.event.foot_comment = []byte(node.FootComment)
		e.emit()

	case AliasNode:
		yaml_alias_event_initialize(&e.event, []byte(node.Value))
		e.event.head_comment = []byte(node.HeadComment)
		e.event.line_comment = []byte(node.LineComment)
		e.event.foot_comment = []byte(node.FootComment)
		e.emit()

	case ScalarNode:
		value := node.Value
		if !utf8.ValidString(value) {
			if stag == binaryTag {
				failf("explicitly tagged !!binary data must be base64-encoded")
			}
			if stag != "" {
				failf("cannot marshal invalid UTF-8 data as %s", stag)
			}
			// It can't be encoded directly as YAML so use a binary tag
			// and encode it as base64.
			tag = binaryTag
			value = encodeBase64(value)
		}

		style := yaml_PLAIN_SCALAR_STYLE
		switch {
		case node.Style&DoubleQuotedStyle != 0:
			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
		case node.Style&SingleQuotedStyle != 0:
			style = yaml_SINGLE_QUOTED_SCALAR_STYLE
		case node.Style&LiteralStyle != 0:
			style = yaml_LITERAL_SCALAR_STYLE
		case node.Style&FoldedStyle != 0:
			style = yaml_FOLDED_SCALAR_STYLE
		case strings.Contains(value, "\n"):
			style = yaml_LITERAL_SCALAR_STYLE
		case forceQuoting:
			style = yaml_DOUBLE_QUOTED_SCALAR_STYLE
		}

		e.emitScalar(value, node.Anchor, tag, style, []byte(node.HeadComment), []byte(node.LineComment), []byte(node.FootComment), []byte(tail))
	default:
		failf("cannot encode node with unknown kind %d", node.Kind)
	}
}