luet/vendor/github.com/json-iterator/go/reflect.go
Itxaka 4adc0dc9b9
Use goreleaser to build and release (#244)
Instead of using gox on one side and an action to release, we can merge
them together with goreleaser which will build for extra targets (arm,
mips if needed in the future) and it also takes care of creating
checksums, a source archive, and a changelog and creating a release with
all the artifacts.

All binaries should respect the old naming convention, so any scripts
out there should still work.

Signed-off-by: Itxaka <igarcia@suse.com>
2021-08-11 08:30:55 +02:00

338 lines
8.5 KiB
Go

package jsoniter
import (
"fmt"
"reflect"
"unsafe"
"github.com/modern-go/reflect2"
)
// ValDecoder is an internal type registered to cache as needed.
// Don't confuse jsoniter.ValDecoder with json.Decoder.
// For json.Decoder's adapter, refer to jsoniter.AdapterDecoder(todo link).
//
// Reflection on type to create decoders, which is then cached
// Reflection on value is avoided as we can, as the reflect.Value itself will allocate, with following exceptions
// 1. create instance of new value, for example *int will need a int to be allocated
// 2. append to slice, if the existing cap is not enough, allocate will be done using Reflect.New
// 3. assignment to map, both key and value will be reflect.Value
// For a simple struct binding, it will be reflect.Value free and allocation free
type ValDecoder interface {
Decode(ptr unsafe.Pointer, iter *Iterator)
}
// ValEncoder is an internal type registered to cache as needed.
// Don't confuse jsoniter.ValEncoder with json.Encoder.
// For json.Encoder's adapter, refer to jsoniter.AdapterEncoder(todo godoc link).
type ValEncoder interface {
IsEmpty(ptr unsafe.Pointer) bool
Encode(ptr unsafe.Pointer, stream *Stream)
}
type checkIsEmpty interface {
IsEmpty(ptr unsafe.Pointer) bool
}
type ctx struct {
*frozenConfig
prefix string
encoders map[reflect2.Type]ValEncoder
decoders map[reflect2.Type]ValDecoder
}
func (b *ctx) caseSensitive() bool {
if b.frozenConfig == nil {
// default is case-insensitive
return false
}
return b.frozenConfig.caseSensitive
}
func (b *ctx) append(prefix string) *ctx {
return &ctx{
frozenConfig: b.frozenConfig,
prefix: b.prefix + " " + prefix,
encoders: b.encoders,
decoders: b.decoders,
}
}
// ReadVal copy the underlying JSON into go interface, same as json.Unmarshal
func (iter *Iterator) ReadVal(obj interface{}) {
depth := iter.depth
cacheKey := reflect2.RTypeOf(obj)
decoder := iter.cfg.getDecoderFromCache(cacheKey)
if decoder == nil {
typ := reflect2.TypeOf(obj)
if typ == nil || typ.Kind() != reflect.Ptr {
iter.ReportError("ReadVal", "can only unmarshal into pointer")
return
}
decoder = iter.cfg.DecoderOf(typ)
}
ptr := reflect2.PtrOf(obj)
if ptr == nil {
iter.ReportError("ReadVal", "can not read into nil pointer")
return
}
decoder.Decode(ptr, iter)
if iter.depth != depth {
iter.ReportError("ReadVal", "unexpected mismatched nesting")
return
}
}
// WriteVal copy the go interface into underlying JSON, same as json.Marshal
func (stream *Stream) WriteVal(val interface{}) {
if nil == val {
stream.WriteNil()
return
}
cacheKey := reflect2.RTypeOf(val)
encoder := stream.cfg.getEncoderFromCache(cacheKey)
if encoder == nil {
typ := reflect2.TypeOf(val)
encoder = stream.cfg.EncoderOf(typ)
}
encoder.Encode(reflect2.PtrOf(val), stream)
}
func (cfg *frozenConfig) DecoderOf(typ reflect2.Type) ValDecoder {
cacheKey := typ.RType()
decoder := cfg.getDecoderFromCache(cacheKey)
if decoder != nil {
return decoder
}
ctx := &ctx{
frozenConfig: cfg,
prefix: "",
decoders: map[reflect2.Type]ValDecoder{},
encoders: map[reflect2.Type]ValEncoder{},
}
ptrType := typ.(*reflect2.UnsafePtrType)
decoder = decoderOfType(ctx, ptrType.Elem())
cfg.addDecoderToCache(cacheKey, decoder)
return decoder
}
func decoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
decoder := getTypeDecoderFromExtension(ctx, typ)
if decoder != nil {
return decoder
}
decoder = createDecoderOfType(ctx, typ)
for _, extension := range extensions {
decoder = extension.DecorateDecoder(typ, decoder)
}
decoder = ctx.decoderExtension.DecorateDecoder(typ, decoder)
for _, extension := range ctx.extraExtensions {
decoder = extension.DecorateDecoder(typ, decoder)
}
return decoder
}
func createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
decoder := ctx.decoders[typ]
if decoder != nil {
return decoder
}
placeholder := &placeholderDecoder{}
ctx.decoders[typ] = placeholder
decoder = _createDecoderOfType(ctx, typ)
placeholder.decoder = decoder
return decoder
}
func _createDecoderOfType(ctx *ctx, typ reflect2.Type) ValDecoder {
decoder := createDecoderOfJsonRawMessage(ctx, typ)
if decoder != nil {
return decoder
}
decoder = createDecoderOfJsonNumber(ctx, typ)
if decoder != nil {
return decoder
}
decoder = createDecoderOfMarshaler(ctx, typ)
if decoder != nil {
return decoder
}
decoder = createDecoderOfAny(ctx, typ)
if decoder != nil {
return decoder
}
decoder = createDecoderOfNative(ctx, typ)
if decoder != nil {
return decoder
}
switch typ.Kind() {
case reflect.Interface:
ifaceType, isIFace := typ.(*reflect2.UnsafeIFaceType)
if isIFace {
return &ifaceDecoder{valType: ifaceType}
}
return &efaceDecoder{}
case reflect.Struct:
return decoderOfStruct(ctx, typ)
case reflect.Array:
return decoderOfArray(ctx, typ)
case reflect.Slice:
return decoderOfSlice(ctx, typ)
case reflect.Map:
return decoderOfMap(ctx, typ)
case reflect.Ptr:
return decoderOfOptional(ctx, typ)
default:
return &lazyErrorDecoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
}
}
func (cfg *frozenConfig) EncoderOf(typ reflect2.Type) ValEncoder {
cacheKey := typ.RType()
encoder := cfg.getEncoderFromCache(cacheKey)
if encoder != nil {
return encoder
}
ctx := &ctx{
frozenConfig: cfg,
prefix: "",
decoders: map[reflect2.Type]ValDecoder{},
encoders: map[reflect2.Type]ValEncoder{},
}
encoder = encoderOfType(ctx, typ)
if typ.LikePtr() {
encoder = &onePtrEncoder{encoder}
}
cfg.addEncoderToCache(cacheKey, encoder)
return encoder
}
type onePtrEncoder struct {
encoder ValEncoder
}
func (encoder *onePtrEncoder) IsEmpty(ptr unsafe.Pointer) bool {
return encoder.encoder.IsEmpty(unsafe.Pointer(&ptr))
}
func (encoder *onePtrEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
encoder.encoder.Encode(unsafe.Pointer(&ptr), stream)
}
func encoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
encoder := getTypeEncoderFromExtension(ctx, typ)
if encoder != nil {
return encoder
}
encoder = createEncoderOfType(ctx, typ)
for _, extension := range extensions {
encoder = extension.DecorateEncoder(typ, encoder)
}
encoder = ctx.encoderExtension.DecorateEncoder(typ, encoder)
for _, extension := range ctx.extraExtensions {
encoder = extension.DecorateEncoder(typ, encoder)
}
return encoder
}
func createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
encoder := ctx.encoders[typ]
if encoder != nil {
return encoder
}
placeholder := &placeholderEncoder{}
ctx.encoders[typ] = placeholder
encoder = _createEncoderOfType(ctx, typ)
placeholder.encoder = encoder
return encoder
}
func _createEncoderOfType(ctx *ctx, typ reflect2.Type) ValEncoder {
encoder := createEncoderOfJsonRawMessage(ctx, typ)
if encoder != nil {
return encoder
}
encoder = createEncoderOfJsonNumber(ctx, typ)
if encoder != nil {
return encoder
}
encoder = createEncoderOfMarshaler(ctx, typ)
if encoder != nil {
return encoder
}
encoder = createEncoderOfAny(ctx, typ)
if encoder != nil {
return encoder
}
encoder = createEncoderOfNative(ctx, typ)
if encoder != nil {
return encoder
}
kind := typ.Kind()
switch kind {
case reflect.Interface:
return &dynamicEncoder{typ}
case reflect.Struct:
return encoderOfStruct(ctx, typ)
case reflect.Array:
return encoderOfArray(ctx, typ)
case reflect.Slice:
return encoderOfSlice(ctx, typ)
case reflect.Map:
return encoderOfMap(ctx, typ)
case reflect.Ptr:
return encoderOfOptional(ctx, typ)
default:
return &lazyErrorEncoder{err: fmt.Errorf("%s%s is unsupported type", ctx.prefix, typ.String())}
}
}
type lazyErrorDecoder struct {
err error
}
func (decoder *lazyErrorDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
if iter.WhatIsNext() != NilValue {
if iter.Error == nil {
iter.Error = decoder.err
}
} else {
iter.Skip()
}
}
type lazyErrorEncoder struct {
err error
}
func (encoder *lazyErrorEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
if ptr == nil {
stream.WriteNil()
} else if stream.Error == nil {
stream.Error = encoder.err
}
}
func (encoder *lazyErrorEncoder) IsEmpty(ptr unsafe.Pointer) bool {
return false
}
type placeholderDecoder struct {
decoder ValDecoder
}
func (decoder *placeholderDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
decoder.decoder.Decode(ptr, iter)
}
type placeholderEncoder struct {
encoder ValEncoder
}
func (encoder *placeholderEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
encoder.encoder.Encode(ptr, stream)
}
func (encoder *placeholderEncoder) IsEmpty(ptr unsafe.Pointer) bool {
return encoder.encoder.IsEmpty(ptr)
}