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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package graphson
import (
"io"
"reflect"
"unsafe"
jsoniter "github.com/json-iterator/go"
"github.com/modern-go/reflect2"
"github.com/pkg/errors"
)
// DecoratorOfSlice decorates a value encoder of a slice type.
func (encodeExtension) DecoratorOfSlice(typ reflect2.Type, enc jsoniter.ValEncoder) jsoniter.ValEncoder {
encoder := typeEncoder{ValEncoder: enc}
sliceType := typ.(reflect2.SliceType)
if sliceType.Elem().Kind() == reflect.Uint8 {
encoder.Type = byteBufferType
} else {
encoder.Type = listType
}
return sliceEncoder{sliceType, encoder}
}
// DecoratorOfArray decorates a value encoder of an array type.
func (encodeExtension) DecoratorOfArray(enc jsoniter.ValEncoder) jsoniter.ValEncoder {
return typeEncoder{enc, listType}
}
// DecoderOfSlice returns a value decoder of a slice type.
func (ext decodeExtension) DecoderOfSlice(typ reflect2.Type) jsoniter.ValDecoder {
sliceType := typ.(reflect2.SliceType)
elemType := sliceType.Elem()
if elemType.Kind() == reflect.Uint8 {
return nil
}
return sliceDecoder{
sliceType: sliceType,
elemDec: ext.LazyDecoderOf(elemType),
}
}
// DecoderOfArray returns a value decoder of an array type.
func (ext decodeExtension) DecoderOfArray(typ reflect2.Type) jsoniter.ValDecoder {
arrayType := typ.(reflect2.ArrayType)
return arrayDecoder{
arrayType: arrayType,
elemDec: ext.LazyDecoderOf(arrayType.Elem()),
}
}
// DecoratorOfSlice decorates a value decoder of a slice type.
func (ext decodeExtension) DecoratorOfSlice(typ reflect2.Type, dec jsoniter.ValDecoder) jsoniter.ValDecoder {
if typ.(reflect2.SliceType).Elem().Kind() == reflect.Uint8 {
return typeDecoder{dec, byteBufferType}
}
return typeDecoder{dec, listType}
}
// DecoratorOfArray decorates a value decoder of an array type.
func (ext decodeExtension) DecoratorOfArray(dec jsoniter.ValDecoder) jsoniter.ValDecoder {
return typeDecoder{dec, listType}
}
type sliceEncoder struct {
sliceType reflect2.SliceType
jsoniter.ValEncoder
}
func (enc sliceEncoder) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
if enc.sliceType.UnsafeIsNil(ptr) {
stream.WriteNil()
} else {
enc.ValEncoder.Encode(ptr, stream)
}
}
type sliceDecoder struct {
sliceType reflect2.SliceType
elemDec jsoniter.ValDecoder
}
func (dec sliceDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
dec.decode(ptr, iter)
if iter.Error != nil && iter.Error != io.EOF {
iter.Error = errors.Wrapf(iter.Error, "decoding slice %s", dec.sliceType)
}
}
func (dec sliceDecoder) decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
sliceType := dec.sliceType
if iter.ReadNil() {
sliceType.UnsafeSetNil(ptr)
return
}
sliceType.UnsafeSet(ptr, sliceType.UnsafeMakeSlice(0, 0))
var length int
iter.ReadArrayCB(func(iter *jsoniter.Iterator) bool {
idx := length
length++
sliceType.UnsafeGrow(ptr, length)
elem := sliceType.UnsafeGetIndex(ptr, idx)
dec.elemDec.Decode(elem, iter)
return iter.Error == nil
})
}
type arrayDecoder struct {
arrayType reflect2.ArrayType
elemDec jsoniter.ValDecoder
}
func (dec arrayDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
dec.decode(ptr, iter)
if iter.Error != nil && iter.Error != io.EOF {
iter.Error = errors.Wrapf(iter.Error, "decoding array %s", dec.arrayType)
}
}
func (dec arrayDecoder) decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
var (
arrayType = dec.arrayType
length int
)
iter.ReadArrayCB(func(iter *jsoniter.Iterator) bool {
if length < arrayType.Len() {
idx := length
length++
elem := arrayType.UnsafeGetIndex(ptr, idx)
dec.elemDec.Decode(elem, iter)
} else {
iter.Skip()
}
return iter.Error == nil
})
}
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