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
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129

package jsoniter

import (
	"github.com/modern-go/reflect2"
	"unsafe"
)

func decoderOfOptional(ctx *ctx, typ reflect2.Type) ValDecoder {
	ptrType := typ.(*reflect2.UnsafePtrType)
	elemType := ptrType.Elem()
	decoder := decoderOfType(ctx, elemType)
	return &OptionalDecoder{elemType, decoder}
}

func encoderOfOptional(ctx *ctx, typ reflect2.Type) ValEncoder {
	ptrType := typ.(*reflect2.UnsafePtrType)
	elemType := ptrType.Elem()
	elemEncoder := encoderOfType(ctx, elemType)
	encoder := &OptionalEncoder{elemEncoder}
	return encoder
}

type OptionalDecoder struct {
	ValueType    reflect2.Type
	ValueDecoder ValDecoder
}

func (decoder *OptionalDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
	if iter.ReadNil() {
		*((*unsafe.Pointer)(ptr)) = nil
	} else {
		if *((*unsafe.Pointer)(ptr)) == nil {
			//pointer to null, we have to allocate memory to hold the value
			newPtr := decoder.ValueType.UnsafeNew()
			decoder.ValueDecoder.Decode(newPtr, iter)
			*((*unsafe.Pointer)(ptr)) = newPtr
		} else {
			//reuse existing instance
			decoder.ValueDecoder.Decode(*((*unsafe.Pointer)(ptr)), iter)
		}
	}
}

type dereferenceDecoder struct {
	// only to deference a pointer
	valueType    reflect2.Type
	valueDecoder ValDecoder
}

func (decoder *dereferenceDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
	if *((*unsafe.Pointer)(ptr)) == nil {
		//pointer to null, we have to allocate memory to hold the value
		newPtr := decoder.valueType.UnsafeNew()
		decoder.valueDecoder.Decode(newPtr, iter)
		*((*unsafe.Pointer)(ptr)) = newPtr
	} else {
		//reuse existing instance
		decoder.valueDecoder.Decode(*((*unsafe.Pointer)(ptr)), iter)
	}
}

type OptionalEncoder struct {
	ValueEncoder ValEncoder
}

func (encoder *OptionalEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
	if *((*unsafe.Pointer)(ptr)) == nil {
		stream.WriteNil()
	} else {
		encoder.ValueEncoder.Encode(*((*unsafe.Pointer)(ptr)), stream)
	}
}

func (encoder *OptionalEncoder) IsEmpty(ptr unsafe.Pointer) bool {
	return *((*unsafe.Pointer)(ptr)) == nil
}

type dereferenceEncoder struct {
	ValueEncoder ValEncoder
}

func (encoder *dereferenceEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
	if *((*unsafe.Pointer)(ptr)) == nil {
		stream.WriteNil()
	} else {
		encoder.ValueEncoder.Encode(*((*unsafe.Pointer)(ptr)), stream)
	}
}

func (encoder *dereferenceEncoder) IsEmpty(ptr unsafe.Pointer) bool {
	dePtr := *((*unsafe.Pointer)(ptr))
	if dePtr == nil {
		return true
	}
	return encoder.ValueEncoder.IsEmpty(dePtr)
}

func (encoder *dereferenceEncoder) IsEmbeddedPtrNil(ptr unsafe.Pointer) bool {
	deReferenced := *((*unsafe.Pointer)(ptr))
	if deReferenced == nil {
		return true
	}
	isEmbeddedPtrNil, converted := encoder.ValueEncoder.(IsEmbeddedPtrNil)
	if !converted {
		return false
	}
	fieldPtr := unsafe.Pointer(deReferenced)
	return isEmbeddedPtrNil.IsEmbeddedPtrNil(fieldPtr)
}

type referenceEncoder struct {
	encoder ValEncoder
}

func (encoder *referenceEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
	encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
}

func (encoder *referenceEncoder) IsEmpty(ptr unsafe.Pointer) bool {
	return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
}

type referenceDecoder struct {
	decoder ValDecoder
}

func (decoder *referenceDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
	decoder.decoder.Decode(unsafe.Pointer(&ptr), iter)
}