1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94

//
// Copyright 2021, Sander van Harmelen
//
// 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 gitlab

import (
	"bytes"
	"fmt"

	"reflect"
)

// Stringify attempts to create a reasonable string representation of types in
// the Gitlab library.  It does things like resolve pointers to their values
// and omits struct fields with nil values.
func Stringify(message interface{}) string {
	var buf bytes.Buffer
	v := reflect.ValueOf(message)
	stringifyValue(&buf, v)
	return buf.String()
}

// stringifyValue was heavily inspired by the goprotobuf library.
func stringifyValue(buf *bytes.Buffer, val reflect.Value) {
	if val.Kind() == reflect.Ptr && val.IsNil() {
		buf.WriteString("<nil>")
		return
	}

	v := reflect.Indirect(val)

	switch v.Kind() {
	case reflect.String:
		fmt.Fprintf(buf, `"%s"`, v)
	case reflect.Slice:
		buf.WriteByte('[')
		for i := 0; i < v.Len(); i++ {
			if i > 0 {
				buf.WriteByte(' ')
			}

			stringifyValue(buf, v.Index(i))
		}

		buf.WriteByte(']')
		return
	case reflect.Struct:
		if v.Type().Name() != "" {
			buf.WriteString(v.Type().String())
		}

		buf.WriteByte('{')

		var sep bool
		for i := 0; i < v.NumField(); i++ {
			fv := v.Field(i)
			if fv.Kind() == reflect.Ptr && fv.IsNil() {
				continue
			}
			if fv.Kind() == reflect.Slice && fv.IsNil() {
				continue
			}

			if sep {
				buf.WriteString(", ")
			} else {
				sep = true
			}

			buf.WriteString(v.Type().Field(i).Name)
			buf.WriteByte(':')
			stringifyValue(buf, fv)
		}

		buf.WriteByte('}')
	default:
		if v.CanInterface() {
			fmt.Fprint(buf, v.Interface())
		}
	}
}