forked from mirror/go-json
444 lines
14 KiB
Go
444 lines
14 KiB
Go
package json
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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"unicode"
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"unsafe"
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)
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var (
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jsonNumberType = reflect.TypeOf(json.Number(""))
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)
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func decodeCompileToGetDecoderSlowPath(typeptr uintptr, typ *rtype) (decoder, error) {
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decoderMap := loadDecoderMap()
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if dec, exists := decoderMap[typeptr]; exists {
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return dec, nil
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}
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dec, err := decodeCompileHead(typ, map[uintptr]decoder{})
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if err != nil {
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return nil, err
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}
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storeDecoder(typeptr, dec, decoderMap)
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return dec, nil
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}
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func decodeCompileHead(typ *rtype, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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switch {
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case rtype_ptrTo(typ).Implements(unmarshalJSONType):
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return newUnmarshalJSONDecoder(rtype_ptrTo(typ), "", ""), nil
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case rtype_ptrTo(typ).Implements(unmarshalTextType):
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return newUnmarshalTextDecoder(rtype_ptrTo(typ), "", ""), nil
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}
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return decodeCompile(typ.Elem(), "", "", structTypeToDecoder)
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}
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func decodeCompile(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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switch {
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case rtype_ptrTo(typ).Implements(unmarshalJSONType):
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return newUnmarshalJSONDecoder(rtype_ptrTo(typ), structName, fieldName), nil
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case rtype_ptrTo(typ).Implements(unmarshalTextType):
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return newUnmarshalTextDecoder(rtype_ptrTo(typ), structName, fieldName), nil
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}
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switch typ.Kind() {
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case reflect.Ptr:
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return decodeCompilePtr(typ, structName, fieldName, structTypeToDecoder)
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case reflect.Struct:
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return decodeCompileStruct(typ, structName, fieldName, structTypeToDecoder)
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case reflect.Slice:
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elem := typ.Elem()
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if elem.Kind() == reflect.Uint8 {
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return decodeCompileBytes(elem, structName, fieldName)
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}
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return decodeCompileSlice(typ, structName, fieldName, structTypeToDecoder)
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case reflect.Array:
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return decodeCompileArray(typ, structName, fieldName, structTypeToDecoder)
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case reflect.Map:
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return decodeCompileMap(typ, structName, fieldName, structTypeToDecoder)
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case reflect.Interface:
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return decodeCompileInterface(typ, structName, fieldName)
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case reflect.Uintptr:
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return decodeCompileUint(typ, structName, fieldName)
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case reflect.Int:
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return decodeCompileInt(typ, structName, fieldName)
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case reflect.Int8:
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return decodeCompileInt8(typ, structName, fieldName)
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case reflect.Int16:
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return decodeCompileInt16(typ, structName, fieldName)
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case reflect.Int32:
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return decodeCompileInt32(typ, structName, fieldName)
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case reflect.Int64:
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return decodeCompileInt64(typ, structName, fieldName)
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case reflect.Uint:
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return decodeCompileUint(typ, structName, fieldName)
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case reflect.Uint8:
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return decodeCompileUint8(typ, structName, fieldName)
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case reflect.Uint16:
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return decodeCompileUint16(typ, structName, fieldName)
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case reflect.Uint32:
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return decodeCompileUint32(typ, structName, fieldName)
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case reflect.Uint64:
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return decodeCompileUint64(typ, structName, fieldName)
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case reflect.String:
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return decodeCompileString(typ, structName, fieldName)
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case reflect.Bool:
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return decodeCompileBool(structName, fieldName)
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case reflect.Float32:
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return decodeCompileFloat32(structName, fieldName)
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case reflect.Float64:
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return decodeCompileFloat64(structName, fieldName)
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}
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return nil, &UnmarshalTypeError{
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Value: "object",
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Type: rtype2type(typ),
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Offset: 0,
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}
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}
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func decodeCompileMapKey(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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if rtype_ptrTo(typ).Implements(unmarshalTextType) {
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return newUnmarshalTextDecoder(rtype_ptrTo(typ), structName, fieldName), nil
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}
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dec, err := decodeCompile(typ, structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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for {
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switch t := dec.(type) {
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case *stringDecoder, *interfaceDecoder:
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return dec, nil
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case *boolDecoder, *intDecoder, *uintDecoder, *numberDecoder:
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return newWrappedStringDecoder(typ, dec, structName, fieldName), nil
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case *ptrDecoder:
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dec = t.dec
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default:
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goto ERROR
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}
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}
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ERROR:
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return nil, &UnmarshalTypeError{
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Value: "object",
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Type: rtype2type(typ),
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Offset: 0,
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}
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}
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func decodeCompilePtr(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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dec, err := decodeCompile(typ.Elem(), structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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return newPtrDecoder(dec, typ.Elem(), structName, fieldName), nil
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}
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func decodeCompileInt(typ *rtype, structName, fieldName string) (decoder, error) {
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return newIntDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v int64) {
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*(*int)(p) = int(v)
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}), nil
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}
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func decodeCompileInt8(typ *rtype, structName, fieldName string) (decoder, error) {
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return newIntDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v int64) {
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*(*int8)(p) = int8(v)
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}), nil
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}
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func decodeCompileInt16(typ *rtype, structName, fieldName string) (decoder, error) {
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return newIntDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v int64) {
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*(*int16)(p) = int16(v)
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}), nil
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}
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func decodeCompileInt32(typ *rtype, structName, fieldName string) (decoder, error) {
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return newIntDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v int64) {
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*(*int32)(p) = int32(v)
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}), nil
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}
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func decodeCompileInt64(typ *rtype, structName, fieldName string) (decoder, error) {
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return newIntDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v int64) {
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*(*int64)(p) = v
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}), nil
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}
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func decodeCompileUint(typ *rtype, structName, fieldName string) (decoder, error) {
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return newUintDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v uint64) {
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*(*uint)(p) = uint(v)
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}), nil
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}
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func decodeCompileUint8(typ *rtype, structName, fieldName string) (decoder, error) {
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return newUintDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v uint64) {
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*(*uint8)(p) = uint8(v)
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}), nil
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}
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func decodeCompileUint16(typ *rtype, structName, fieldName string) (decoder, error) {
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return newUintDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v uint64) {
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*(*uint16)(p) = uint16(v)
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}), nil
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}
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func decodeCompileUint32(typ *rtype, structName, fieldName string) (decoder, error) {
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return newUintDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v uint64) {
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*(*uint32)(p) = uint32(v)
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}), nil
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}
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func decodeCompileUint64(typ *rtype, structName, fieldName string) (decoder, error) {
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return newUintDecoder(typ, structName, fieldName, func(p unsafe.Pointer, v uint64) {
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*(*uint64)(p) = v
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}), nil
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}
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func decodeCompileFloat32(structName, fieldName string) (decoder, error) {
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return newFloatDecoder(structName, fieldName, func(p unsafe.Pointer, v float64) {
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*(*float32)(p) = float32(v)
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}), nil
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}
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func decodeCompileFloat64(structName, fieldName string) (decoder, error) {
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return newFloatDecoder(structName, fieldName, func(p unsafe.Pointer, v float64) {
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*(*float64)(p) = v
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}), nil
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}
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func decodeCompileString(typ *rtype, structName, fieldName string) (decoder, error) {
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if typ == type2rtype(jsonNumberType) {
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return newNumberDecoder(structName, fieldName, func(p unsafe.Pointer, v Number) {
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*(*Number)(p) = v
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}), nil
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}
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return newStringDecoder(structName, fieldName), nil
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}
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func decodeCompileBool(structName, fieldName string) (decoder, error) {
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return newBoolDecoder(structName, fieldName), nil
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}
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func decodeCompileBytes(typ *rtype, structName, fieldName string) (decoder, error) {
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return newBytesDecoder(typ, structName, fieldName), nil
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}
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func decodeCompileSlice(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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elem := typ.Elem()
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decoder, err := decodeCompile(elem, structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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return newSliceDecoder(decoder, elem, elem.Size(), structName, fieldName), nil
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}
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func decodeCompileArray(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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elem := typ.Elem()
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decoder, err := decodeCompile(elem, structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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return newArrayDecoder(decoder, elem, typ.Len(), structName, fieldName), nil
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}
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func decodeCompileMap(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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keyDec, err := decodeCompileMapKey(typ.Key(), structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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valueDec, err := decodeCompile(typ.Elem(), structName, fieldName, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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return newMapDecoder(typ, typ.Key(), keyDec, typ.Elem(), valueDec, structName, fieldName), nil
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}
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func decodeCompileInterface(typ *rtype, structName, fieldName string) (decoder, error) {
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return newInterfaceDecoder(typ, structName, fieldName), nil
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}
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func decodeRemoveConflictFields(fieldMap map[string]*structFieldSet, conflictedMap map[string]struct{}, dec *structDecoder, field reflect.StructField) {
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for k, v := range dec.fieldMap {
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if _, exists := conflictedMap[k]; exists {
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// already conflicted key
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continue
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}
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set, exists := fieldMap[k]
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if !exists {
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fieldSet := &structFieldSet{
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dec: v.dec,
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offset: field.Offset + v.offset,
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isTaggedKey: v.isTaggedKey,
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key: k,
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keyLen: int64(len(k)),
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}
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fieldMap[k] = fieldSet
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lower := strings.ToLower(k)
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if _, exists := fieldMap[lower]; !exists {
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fieldMap[lower] = fieldSet
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}
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continue
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}
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if set.isTaggedKey {
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if v.isTaggedKey {
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// conflict tag key
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delete(fieldMap, k)
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delete(fieldMap, strings.ToLower(k))
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conflictedMap[k] = struct{}{}
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conflictedMap[strings.ToLower(k)] = struct{}{}
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}
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} else {
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if v.isTaggedKey {
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fieldSet := &structFieldSet{
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dec: v.dec,
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offset: field.Offset + v.offset,
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isTaggedKey: v.isTaggedKey,
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key: k,
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keyLen: int64(len(k)),
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}
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fieldMap[k] = fieldSet
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lower := strings.ToLower(k)
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if _, exists := fieldMap[lower]; !exists {
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fieldMap[lower] = fieldSet
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}
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} else {
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// conflict tag key
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delete(fieldMap, k)
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delete(fieldMap, strings.ToLower(k))
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conflictedMap[k] = struct{}{}
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conflictedMap[strings.ToLower(k)] = struct{}{}
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}
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}
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}
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}
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func decodeCompileStruct(typ *rtype, structName, fieldName string, structTypeToDecoder map[uintptr]decoder) (decoder, error) {
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fieldNum := typ.NumField()
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conflictedMap := map[string]struct{}{}
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fieldMap := map[string]*structFieldSet{}
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typeptr := uintptr(unsafe.Pointer(typ))
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if dec, exists := structTypeToDecoder[typeptr]; exists {
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return dec, nil
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}
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structDec := newStructDecoder(structName, fieldName, fieldMap)
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structTypeToDecoder[typeptr] = structDec
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structName = typ.Name()
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for i := 0; i < fieldNum; i++ {
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field := typ.Field(i)
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if isIgnoredStructField(field) {
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continue
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}
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isUnexportedField := unicode.IsLower([]rune(field.Name)[0])
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tag := structTagFromField(field)
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dec, err := decodeCompile(type2rtype(field.Type), structName, field.Name, structTypeToDecoder)
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if err != nil {
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return nil, err
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}
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if field.Anonymous && !tag.isTaggedKey {
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if stDec, ok := dec.(*structDecoder); ok {
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if type2rtype(field.Type) == typ {
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// recursive definition
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continue
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}
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decodeRemoveConflictFields(fieldMap, conflictedMap, stDec, field)
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} else if pdec, ok := dec.(*ptrDecoder); ok {
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contentDec := pdec.contentDecoder()
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if pdec.typ == typ {
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// recursive definition
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continue
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}
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var fieldSetErr error
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if isUnexportedField {
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fieldSetErr = fmt.Errorf(
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"json: cannot set embedded pointer to unexported struct: %v",
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field.Type.Elem(),
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)
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}
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if dec, ok := contentDec.(*structDecoder); ok {
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for k, v := range dec.fieldMap {
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if _, exists := conflictedMap[k]; exists {
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// already conflicted key
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continue
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}
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set, exists := fieldMap[k]
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if !exists {
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fieldSet := &structFieldSet{
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dec: newAnonymousFieldDecoder(pdec.typ, v.offset, v.dec),
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offset: field.Offset,
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isTaggedKey: v.isTaggedKey,
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key: k,
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keyLen: int64(len(k)),
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err: fieldSetErr,
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}
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fieldMap[k] = fieldSet
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lower := strings.ToLower(k)
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if _, exists := fieldMap[lower]; !exists {
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fieldMap[lower] = fieldSet
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}
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continue
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}
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if set.isTaggedKey {
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if v.isTaggedKey {
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// conflict tag key
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delete(fieldMap, k)
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delete(fieldMap, strings.ToLower(k))
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conflictedMap[k] = struct{}{}
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conflictedMap[strings.ToLower(k)] = struct{}{}
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}
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} else {
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if v.isTaggedKey {
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fieldSet := &structFieldSet{
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dec: newAnonymousFieldDecoder(pdec.typ, v.offset, v.dec),
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offset: field.Offset,
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isTaggedKey: v.isTaggedKey,
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key: k,
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keyLen: int64(len(k)),
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err: fieldSetErr,
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}
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fieldMap[k] = fieldSet
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lower := strings.ToLower(k)
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if _, exists := fieldMap[lower]; !exists {
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fieldMap[lower] = fieldSet
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}
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} else {
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// conflict tag key
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delete(fieldMap, k)
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delete(fieldMap, strings.ToLower(k))
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conflictedMap[k] = struct{}{}
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conflictedMap[strings.ToLower(k)] = struct{}{}
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}
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}
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}
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}
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}
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} else {
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if tag.isString {
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dec = newWrappedStringDecoder(type2rtype(field.Type), dec, structName, field.Name)
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}
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var key string
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if tag.key != "" {
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key = tag.key
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} else {
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key = field.Name
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}
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fieldSet := &structFieldSet{
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dec: dec,
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offset: field.Offset,
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isTaggedKey: tag.isTaggedKey,
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key: key,
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keyLen: int64(len(key)),
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}
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fieldMap[key] = fieldSet
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lower := strings.ToLower(key)
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if _, exists := fieldMap[lower]; !exists {
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fieldMap[lower] = fieldSet
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}
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}
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}
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delete(structTypeToDecoder, typeptr)
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structDec.tryOptimize()
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return structDec, nil
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}
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