375 lines
10 KiB
Go
375 lines
10 KiB
Go
package jsoniter
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import (
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"encoding/json"
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"io"
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"reflect"
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"sync"
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"unsafe"
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"github.com/modern-go/concurrent"
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"github.com/modern-go/reflect2"
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)
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// Config customize how the API should behave.
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// The API is created from Config by Froze.
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type Config struct {
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IndentionStep int
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MarshalFloatWith6Digits bool
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EscapeHTML bool
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SortMapKeys bool
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UseNumber bool
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DisallowUnknownFields bool
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TagKey string
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OnlyTaggedField bool
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ValidateJsonRawMessage bool
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ObjectFieldMustBeSimpleString bool
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CaseSensitive bool
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}
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// API the public interface of this package.
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// Primary Marshal and Unmarshal.
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type API interface {
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IteratorPool
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StreamPool
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MarshalToString(v interface{}) (string, error)
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Marshal(v interface{}) ([]byte, error)
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MarshalIndent(v interface{}, prefix, indent string) ([]byte, error)
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UnmarshalFromString(str string, v interface{}) error
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Unmarshal(data []byte, v interface{}) error
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Get(data []byte, path ...interface{}) Any
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NewEncoder(writer io.Writer) *Encoder
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NewDecoder(reader io.Reader) *Decoder
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Valid(data []byte) bool
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RegisterExtension(extension Extension)
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DecoderOf(typ reflect2.Type) ValDecoder
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EncoderOf(typ reflect2.Type) ValEncoder
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}
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// ConfigDefault the default API
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var ConfigDefault = Config{
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EscapeHTML: true,
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}.Froze()
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// ConfigCompatibleWithStandardLibrary tries to be 100% compatible with standard library behavior
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var ConfigCompatibleWithStandardLibrary = Config{
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EscapeHTML: true,
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SortMapKeys: true,
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ValidateJsonRawMessage: true,
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}.Froze()
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// ConfigFastest marshals float with only 6 digits precision
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var ConfigFastest = Config{
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EscapeHTML: false,
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MarshalFloatWith6Digits: true, // will lose precession
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ObjectFieldMustBeSimpleString: true, // do not unescape object field
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}.Froze()
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type frozenConfig struct {
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configBeforeFrozen Config
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sortMapKeys bool
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indentionStep int
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objectFieldMustBeSimpleString bool
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onlyTaggedField bool
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disallowUnknownFields bool
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decoderCache *concurrent.Map
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encoderCache *concurrent.Map
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encoderExtension Extension
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decoderExtension Extension
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extraExtensions []Extension
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streamPool *sync.Pool
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iteratorPool *sync.Pool
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caseSensitive bool
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}
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func (cfg *frozenConfig) initCache() {
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cfg.decoderCache = concurrent.NewMap()
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cfg.encoderCache = concurrent.NewMap()
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}
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func (cfg *frozenConfig) addDecoderToCache(cacheKey uintptr, decoder ValDecoder) {
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cfg.decoderCache.Store(cacheKey, decoder)
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}
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func (cfg *frozenConfig) addEncoderToCache(cacheKey uintptr, encoder ValEncoder) {
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cfg.encoderCache.Store(cacheKey, encoder)
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}
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func (cfg *frozenConfig) getDecoderFromCache(cacheKey uintptr) ValDecoder {
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decoder, found := cfg.decoderCache.Load(cacheKey)
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if found {
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return decoder.(ValDecoder)
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}
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return nil
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}
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func (cfg *frozenConfig) getEncoderFromCache(cacheKey uintptr) ValEncoder {
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encoder, found := cfg.encoderCache.Load(cacheKey)
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if found {
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return encoder.(ValEncoder)
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}
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return nil
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}
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var cfgCache = concurrent.NewMap()
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func getFrozenConfigFromCache(cfg Config) *frozenConfig {
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obj, found := cfgCache.Load(cfg)
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if found {
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return obj.(*frozenConfig)
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}
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return nil
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}
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func addFrozenConfigToCache(cfg Config, frozenConfig *frozenConfig) {
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cfgCache.Store(cfg, frozenConfig)
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}
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// Froze forge API from config
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func (cfg Config) Froze() API {
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api := &frozenConfig{
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sortMapKeys: cfg.SortMapKeys,
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indentionStep: cfg.IndentionStep,
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objectFieldMustBeSimpleString: cfg.ObjectFieldMustBeSimpleString,
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onlyTaggedField: cfg.OnlyTaggedField,
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disallowUnknownFields: cfg.DisallowUnknownFields,
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caseSensitive: cfg.CaseSensitive,
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}
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api.streamPool = &sync.Pool{
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New: func() interface{} {
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return NewStream(api, nil, 512)
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},
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}
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api.iteratorPool = &sync.Pool{
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New: func() interface{} {
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return NewIterator(api)
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},
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}
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api.initCache()
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encoderExtension := EncoderExtension{}
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decoderExtension := DecoderExtension{}
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if cfg.MarshalFloatWith6Digits {
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api.marshalFloatWith6Digits(encoderExtension)
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}
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if cfg.EscapeHTML {
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api.escapeHTML(encoderExtension)
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}
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if cfg.UseNumber {
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api.useNumber(decoderExtension)
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}
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if cfg.ValidateJsonRawMessage {
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api.validateJsonRawMessage(encoderExtension)
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}
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api.encoderExtension = encoderExtension
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api.decoderExtension = decoderExtension
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api.configBeforeFrozen = cfg
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return api
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}
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func (cfg Config) frozeWithCacheReuse(extraExtensions []Extension) *frozenConfig {
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api := getFrozenConfigFromCache(cfg)
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if api != nil {
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return api
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}
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api = cfg.Froze().(*frozenConfig)
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for _, extension := range extraExtensions {
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api.RegisterExtension(extension)
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}
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addFrozenConfigToCache(cfg, api)
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return api
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}
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func (cfg *frozenConfig) validateJsonRawMessage(extension EncoderExtension) {
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encoder := &funcEncoder{func(ptr unsafe.Pointer, stream *Stream) {
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rawMessage := *(*json.RawMessage)(ptr)
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iter := cfg.BorrowIterator([]byte(rawMessage))
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iter.Read()
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if iter.Error != nil {
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stream.WriteRaw("null")
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} else {
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cfg.ReturnIterator(iter)
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stream.WriteRaw(string(rawMessage))
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}
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}, func(ptr unsafe.Pointer) bool {
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return len(*((*json.RawMessage)(ptr))) == 0
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}}
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extension[reflect2.TypeOfPtr((*json.RawMessage)(nil)).Elem()] = encoder
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extension[reflect2.TypeOfPtr((*RawMessage)(nil)).Elem()] = encoder
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}
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func (cfg *frozenConfig) useNumber(extension DecoderExtension) {
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extension[reflect2.TypeOfPtr((*interface{})(nil)).Elem()] = &funcDecoder{func(ptr unsafe.Pointer, iter *Iterator) {
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exitingValue := *((*interface{})(ptr))
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if exitingValue != nil && reflect.TypeOf(exitingValue).Kind() == reflect.Ptr {
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iter.ReadVal(exitingValue)
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return
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}
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if iter.WhatIsNext() == NumberValue {
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*((*interface{})(ptr)) = json.Number(iter.readNumberAsString())
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} else {
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*((*interface{})(ptr)) = iter.Read()
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}
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}}
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}
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func (cfg *frozenConfig) getTagKey() string {
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tagKey := cfg.configBeforeFrozen.TagKey
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if tagKey == "" {
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return "json"
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}
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return tagKey
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}
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func (cfg *frozenConfig) RegisterExtension(extension Extension) {
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cfg.extraExtensions = append(cfg.extraExtensions, extension)
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copied := cfg.configBeforeFrozen
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cfg.configBeforeFrozen = copied
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}
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type lossyFloat32Encoder struct {
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}
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func (encoder *lossyFloat32Encoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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stream.WriteFloat32Lossy(*((*float32)(ptr)))
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}
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func (encoder *lossyFloat32Encoder) IsEmpty(ptr unsafe.Pointer) bool {
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return *((*float32)(ptr)) == 0
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}
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type lossyFloat64Encoder struct {
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}
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func (encoder *lossyFloat64Encoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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stream.WriteFloat64Lossy(*((*float64)(ptr)))
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}
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func (encoder *lossyFloat64Encoder) IsEmpty(ptr unsafe.Pointer) bool {
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return *((*float64)(ptr)) == 0
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}
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// EnableLossyFloatMarshalling keeps 10**(-6) precision
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// for float variables for better performance.
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func (cfg *frozenConfig) marshalFloatWith6Digits(extension EncoderExtension) {
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// for better performance
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extension[reflect2.TypeOfPtr((*float32)(nil)).Elem()] = &lossyFloat32Encoder{}
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extension[reflect2.TypeOfPtr((*float64)(nil)).Elem()] = &lossyFloat64Encoder{}
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}
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type htmlEscapedStringEncoder struct {
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}
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func (encoder *htmlEscapedStringEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
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str := *((*string)(ptr))
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stream.WriteStringWithHTMLEscaped(str)
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}
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func (encoder *htmlEscapedStringEncoder) IsEmpty(ptr unsafe.Pointer) bool {
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return *((*string)(ptr)) == ""
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}
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func (cfg *frozenConfig) escapeHTML(encoderExtension EncoderExtension) {
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encoderExtension[reflect2.TypeOfPtr((*string)(nil)).Elem()] = &htmlEscapedStringEncoder{}
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}
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func (cfg *frozenConfig) cleanDecoders() {
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typeDecoders = map[string]ValDecoder{}
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fieldDecoders = map[string]ValDecoder{}
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*cfg = *(cfg.configBeforeFrozen.Froze().(*frozenConfig))
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}
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func (cfg *frozenConfig) cleanEncoders() {
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typeEncoders = map[string]ValEncoder{}
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fieldEncoders = map[string]ValEncoder{}
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*cfg = *(cfg.configBeforeFrozen.Froze().(*frozenConfig))
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}
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func (cfg *frozenConfig) MarshalToString(v interface{}) (string, error) {
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stream := cfg.BorrowStream(nil)
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defer cfg.ReturnStream(stream)
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stream.WriteVal(v)
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if stream.Error != nil {
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return "", stream.Error
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}
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return string(stream.Buffer()), nil
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}
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func (cfg *frozenConfig) Marshal(v interface{}) ([]byte, error) {
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stream := cfg.BorrowStream(nil)
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defer cfg.ReturnStream(stream)
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stream.WriteVal(v)
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if stream.Error != nil {
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return nil, stream.Error
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}
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result := stream.Buffer()
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copied := make([]byte, len(result))
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copy(copied, result)
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return copied, nil
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}
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func (cfg *frozenConfig) MarshalIndent(v interface{}, prefix, indent string) ([]byte, error) {
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if prefix != "" {
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panic("prefix is not supported")
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}
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for _, r := range indent {
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if r != ' ' {
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panic("indent can only be space")
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}
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}
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newCfg := cfg.configBeforeFrozen
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newCfg.IndentionStep = len(indent)
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return newCfg.frozeWithCacheReuse(cfg.extraExtensions).Marshal(v)
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}
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func (cfg *frozenConfig) UnmarshalFromString(str string, v interface{}) error {
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data := []byte(str)
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iter := cfg.BorrowIterator(data)
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defer cfg.ReturnIterator(iter)
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iter.ReadVal(v)
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c := iter.nextToken()
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if c == 0 {
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if iter.Error == io.EOF {
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return nil
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}
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return iter.Error
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}
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iter.ReportError("Unmarshal", "there are bytes left after unmarshal")
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return iter.Error
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}
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func (cfg *frozenConfig) Get(data []byte, path ...interface{}) Any {
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iter := cfg.BorrowIterator(data)
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defer cfg.ReturnIterator(iter)
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return locatePath(iter, path)
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}
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func (cfg *frozenConfig) Unmarshal(data []byte, v interface{}) error {
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iter := cfg.BorrowIterator(data)
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defer cfg.ReturnIterator(iter)
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iter.ReadVal(v)
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c := iter.nextToken()
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if c == 0 {
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if iter.Error == io.EOF {
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return nil
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}
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return iter.Error
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}
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iter.ReportError("Unmarshal", "there are bytes left after unmarshal")
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return iter.Error
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}
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func (cfg *frozenConfig) NewEncoder(writer io.Writer) *Encoder {
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stream := NewStream(cfg, writer, 512)
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return &Encoder{stream}
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}
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func (cfg *frozenConfig) NewDecoder(reader io.Reader) *Decoder {
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iter := Parse(cfg, reader, 512)
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return &Decoder{iter}
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}
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func (cfg *frozenConfig) Valid(data []byte) bool {
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iter := cfg.BorrowIterator(data)
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defer cfg.ReturnIterator(iter)
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iter.Skip()
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return iter.Error == nil
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}
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