mirror of
https://github.com/sosedoff/pgweb.git
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313 lines
8.4 KiB
Go
313 lines
8.4 KiB
Go
package jsoniter
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import (
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"encoding/json"
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"errors"
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"io"
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"reflect"
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"sync/atomic"
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"unsafe"
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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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TagKey string
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}
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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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decoderCache unsafe.Pointer
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encoderCache unsafe.Pointer
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extensions []Extension
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streamPool chan *Stream
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iteratorPool chan *Iterator
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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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}
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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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}.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,
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}.Froze()
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// Froze forge API from config
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func (cfg Config) Froze() API {
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// TODO: cache frozen config
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frozenConfig := &frozenConfig{
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sortMapKeys: cfg.SortMapKeys,
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indentionStep: cfg.IndentionStep,
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streamPool: make(chan *Stream, 16),
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iteratorPool: make(chan *Iterator, 16),
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}
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atomic.StorePointer(&frozenConfig.decoderCache, unsafe.Pointer(&map[string]ValDecoder{}))
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atomic.StorePointer(&frozenConfig.encoderCache, unsafe.Pointer(&map[string]ValEncoder{}))
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if cfg.MarshalFloatWith6Digits {
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frozenConfig.marshalFloatWith6Digits()
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}
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if cfg.EscapeHTML {
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frozenConfig.escapeHTML()
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}
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if cfg.UseNumber {
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frozenConfig.useNumber()
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}
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frozenConfig.configBeforeFrozen = cfg
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return frozenConfig
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}
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func (cfg *frozenConfig) useNumber() {
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cfg.addDecoderToCache(reflect.TypeOf((*interface{})(nil)).Elem(), &funcDecoder{func(ptr unsafe.Pointer, iter *Iterator) {
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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.extensions = append(cfg.extensions, extension)
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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) EncodeInterface(val interface{}, stream *Stream) {
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WriteToStream(val, stream, encoder)
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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) EncodeInterface(val interface{}, stream *Stream) {
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WriteToStream(val, stream, encoder)
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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() {
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// for better performance
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cfg.addEncoderToCache(reflect.TypeOf((*float32)(nil)).Elem(), &lossyFloat32Encoder{})
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cfg.addEncoderToCache(reflect.TypeOf((*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) EncodeInterface(val interface{}, stream *Stream) {
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WriteToStream(val, stream, encoder)
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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() {
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cfg.addEncoderToCache(reflect.TypeOf((*string)(nil)).Elem(), &htmlEscapedStringEncoder{})
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}
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func (cfg *frozenConfig) addDecoderToCache(cacheKey reflect.Type, decoder ValDecoder) {
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done := false
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for !done {
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ptr := atomic.LoadPointer(&cfg.decoderCache)
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cache := *(*map[reflect.Type]ValDecoder)(ptr)
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copied := map[reflect.Type]ValDecoder{}
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for k, v := range cache {
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copied[k] = v
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}
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copied[cacheKey] = decoder
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done = atomic.CompareAndSwapPointer(&cfg.decoderCache, ptr, unsafe.Pointer(&copied))
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}
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}
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func (cfg *frozenConfig) addEncoderToCache(cacheKey reflect.Type, encoder ValEncoder) {
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done := false
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for !done {
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ptr := atomic.LoadPointer(&cfg.encoderCache)
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cache := *(*map[reflect.Type]ValEncoder)(ptr)
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copied := map[reflect.Type]ValEncoder{}
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for k, v := range cache {
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copied[k] = v
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}
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copied[cacheKey] = encoder
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done = atomic.CompareAndSwapPointer(&cfg.encoderCache, ptr, unsafe.Pointer(&copied))
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}
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}
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func (cfg *frozenConfig) getDecoderFromCache(cacheKey reflect.Type) ValDecoder {
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ptr := atomic.LoadPointer(&cfg.decoderCache)
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cache := *(*map[reflect.Type]ValDecoder)(ptr)
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return cache[cacheKey]
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}
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func (cfg *frozenConfig) getEncoderFromCache(cacheKey reflect.Type) ValEncoder {
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ptr := atomic.LoadPointer(&cfg.encoderCache)
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cache := *(*map[reflect.Type]ValEncoder)(ptr)
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return cache[cacheKey]
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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.Froze().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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data = data[:lastNotSpacePos(data)]
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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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if iter.head == iter.tail {
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iter.loadMore()
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}
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if iter.Error == io.EOF {
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return nil
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}
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if iter.Error == nil {
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iter.ReportError("UnmarshalFromString", "there are bytes left after unmarshal")
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}
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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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data = data[:lastNotSpacePos(data)]
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iter := cfg.BorrowIterator(data)
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defer cfg.ReturnIterator(iter)
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typ := reflect.TypeOf(v)
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if typ.Kind() != reflect.Ptr {
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// return non-pointer error
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return errors.New("the second param must be ptr type")
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}
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iter.ReadVal(v)
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if iter.head == iter.tail {
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iter.loadMore()
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}
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if iter.Error == io.EOF {
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return nil
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}
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if iter.Error == nil {
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iter.ReportError("Unmarshal", "there are bytes left after unmarshal")
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}
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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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