134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
package jsoniter
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import (
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"github.com/modern-go/reflect2"
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"reflect"
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"unsafe"
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)
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func decoderOfOptional(ctx *ctx, typ reflect2.Type) ValDecoder {
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ptrType := typ.(*reflect2.UnsafePtrType)
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elemType := ptrType.Elem()
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decoder := decoderOfType(ctx, elemType)
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if ctx.prefix == "" && elemType.Kind() == reflect.Ptr {
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return &dereferenceDecoder{elemType, decoder}
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}
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return &OptionalDecoder{elemType, decoder}
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}
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func encoderOfOptional(ctx *ctx, typ reflect2.Type) ValEncoder {
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ptrType := typ.(*reflect2.UnsafePtrType)
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elemType := ptrType.Elem()
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elemEncoder := encoderOfType(ctx, elemType)
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encoder := &OptionalEncoder{elemEncoder}
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return encoder
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}
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type OptionalDecoder struct {
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ValueType reflect2.Type
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ValueDecoder ValDecoder
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}
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func (decoder *OptionalDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
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if iter.ReadNil() {
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*((*unsafe.Pointer)(ptr)) = nil
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} else {
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if *((*unsafe.Pointer)(ptr)) == nil {
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//pointer to null, we have to allocate memory to hold the value
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newPtr := decoder.ValueType.UnsafeNew()
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decoder.ValueDecoder.Decode(newPtr, iter)
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*((*unsafe.Pointer)(ptr)) = newPtr
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} else {
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//reuse existing instance
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decoder.ValueDecoder.Decode(*((*unsafe.Pointer)(ptr)), iter)
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}
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}
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}
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type dereferenceDecoder struct {
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// only to deference a pointer
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valueType reflect2.Type
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valueDecoder ValDecoder
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}
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func (decoder *dereferenceDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
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if *((*unsafe.Pointer)(ptr)) == nil {
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//pointer to null, we have to allocate memory to hold the value
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newPtr := decoder.valueType.UnsafeNew()
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decoder.valueDecoder.Decode(newPtr, iter)
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*((*unsafe.Pointer)(ptr)) = newPtr
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} else {
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//reuse existing instance
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decoder.valueDecoder.Decode(*((*unsafe.Pointer)(ptr)), iter)
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}
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}
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type OptionalEncoder struct {
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ValueEncoder ValEncoder
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}
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func (encoder *OptionalEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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if *((*unsafe.Pointer)(ptr)) == nil {
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stream.WriteNil()
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} else {
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encoder.ValueEncoder.Encode(*((*unsafe.Pointer)(ptr)), stream)
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}
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}
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func (encoder *OptionalEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return *((*unsafe.Pointer)(ptr)) == nil
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}
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type dereferenceEncoder struct {
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ValueEncoder ValEncoder
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}
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func (encoder *dereferenceEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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if *((*unsafe.Pointer)(ptr)) == nil {
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stream.WriteNil()
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} else {
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encoder.ValueEncoder.Encode(*((*unsafe.Pointer)(ptr)), stream)
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}
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}
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func (encoder *dereferenceEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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dePtr := *((*unsafe.Pointer)(ptr))
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if dePtr == nil {
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return true
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}
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return encoder.ValueEncoder.IsEmpty(dePtr)
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}
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func (encoder *dereferenceEncoder) IsEmbeddedPtrNil(ptr unsafe.Pointer) bool {
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deReferenced := *((*unsafe.Pointer)(ptr))
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if deReferenced == nil {
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return true
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}
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isEmbeddedPtrNil, converted := encoder.ValueEncoder.(IsEmbeddedPtrNil)
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if !converted {
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return false
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}
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fieldPtr := unsafe.Pointer(deReferenced)
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return isEmbeddedPtrNil.IsEmbeddedPtrNil(fieldPtr)
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}
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type referenceEncoder struct {
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encoder ValEncoder
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}
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func (encoder *referenceEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
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}
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func (encoder *referenceEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
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}
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type referenceDecoder struct {
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decoder ValDecoder
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}
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func (decoder *referenceDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
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decoder.decoder.Decode(unsafe.Pointer(&ptr), iter)
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}
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