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encode.go
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encode.go
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package kope
import (
"errors"
"fmt"
"github.com/coschain/contentos-go/common"
"reflect"
)
type OpeEncoder interface {
OpeEncode() ([]byte, error)
}
// Encode a signed integer
func EncodeInt(value int) ([]byte, error) {
if common.Is32bitPlatform {
return EncodeInt32(int32(value))
} else {
return EncodeInt64(int64(value))
}
}
// Encode a signed 8-bit integer
func EncodeInt8(value int8) ([]byte, error) {
return encodeSignedInteger(value)
}
// Encode a signed 16-bit integer
func EncodeInt16(value int16) ([]byte, error) {
return encodeSignedInteger(value)
}
// Encode a signed 32-bit integer
func EncodeInt32(value int32) ([]byte, error) {
return encodeSignedInteger(value)
}
// Encode a signed 64-bit integer
func EncodeInt64(value int64) ([]byte, error) {
return encodeSignedInteger(value)
}
// Encode an unsigned integer
func EncodeUint(value uint) ([]byte, error) {
if common.Is32bitPlatform {
return EncodeUint32(uint32(value))
} else {
return EncodeUint64(uint64(value))
}
}
// Encode an unsigned 8-bit integer
func EncodeUint8(value uint8) ([]byte, error) {
return encodeUnsignedInteger(value)
}
// Encode an unsigned 16-bit integer
func EncodeUint16(value uint16) ([]byte, error) {
return encodeUnsignedInteger(value)
}
// Encode an unsigned 32-bit integer
func EncodeUint32(value uint32) ([]byte, error) {
return encodeUnsignedInteger(value)
}
// Encode an unsigned 64-bit integer
func EncodeUint64(value uint64) ([]byte, error) {
return encodeUnsignedInteger(value)
}
// Encode an unsigned pointer integer
func EncodeUintPtr(value uintptr) ([]byte, error) {
return EncodeUint(uint(value))
}
// Encode a bool
func EncodeBool(value bool) ([]byte, error) {
b := uint8(0)
if value {
b = 1
}
return EncodeUint8(b)
}
// Encode a float32
func EncodeFloat32(value float32) ([]byte, error) {
return encodeFloat(value)
}
// Encode a float64
func EncodeFloat64(value float64) ([]byte, error) {
return encodeFloat(value)
}
// Encode a string
func EncodeString(value string) ([]byte, error) {
return EncodeBytes([]byte(value))
}
// Encode a byte slice
func EncodeBytes(value []byte) ([]byte, error) {
return packString(value), nil
}
func EncodeSlice(value []interface{}) ([]byte, error) {
children := make([][]byte, len(value))
var err error
var d []byte
for i, c := range value {
if d, err = Encode(c); err != nil {
return nil, err
}
children[i] = d
}
return encodeSlice(children)
}
// Encode a OpeEncoder
func EncodeOpeEncoder(value OpeEncoder) ([]byte, error) {
return value.OpeEncode()
}
var opeEncoderInterfaceType = reflect.TypeOf((*OpeEncoder)(nil)).Elem()
func EncodeValue(rv reflect.Value) ([]byte, error) {
k := rv.Kind()
if k == reflect.Invalid {
return nil, errors.New("kope: cannot encode zero values")
}
rt := rv.Type()
if rt.Implements(opeEncoderInterfaceType) {
if k == reflect.Ptr && rv.IsNil() {
return encodeNil()
}
return EncodeOpeEncoder(rv.Interface().(OpeEncoder))
}
if k == reflect.Ptr {
if rv.IsNil() {
return encodeNil()
}
if rt.Elem().Kind() == reflect.String {
ptr := rv.Interface().(*string)
if ptr == MinimalKey {
return encodeMinMaxKey(true)
} else if ptr == MaximumKey {
return encodeMinMaxKey(false)
}
}
return EncodeValue(reflect.Indirect(rv))
}
switch k {
case reflect.Bool:
return EncodeBool(rv.Bool())
case reflect.Int:
return EncodeInt(int(rv.Int()))
case reflect.Int8:
return EncodeInt8(int8(rv.Int()))
case reflect.Int16:
return EncodeInt16(int16(rv.Int()))
case reflect.Int32:
return EncodeInt32(int32(rv.Int()))
case reflect.Int64:
return EncodeInt64(rv.Int())
case reflect.Uint:
return EncodeUint(uint(rv.Uint()))
case reflect.Uint8:
return EncodeUint8(uint8(rv.Uint()))
case reflect.Uint16:
return EncodeUint16(uint16(rv.Uint()))
case reflect.Uint32:
return EncodeUint32(uint32(rv.Uint()))
case reflect.Uint64:
return EncodeUint64(rv.Uint())
case reflect.Uintptr:
return EncodeUintPtr(uintptr(rv.Uint()))
case reflect.Float32:
return EncodeFloat32(float32(rv.Float()))
case reflect.Float64:
return EncodeFloat64(rv.Float())
case reflect.String:
return EncodeString(rv.String())
case reflect.Array, reflect.Slice:
if rt.Elem().Kind() == reflect.Uint8 {
return EncodeBytes(rv.Bytes())
}
size := rv.Len()
elements := make([]interface{}, size)
for i := 0; i < size; i++ {
elements[i] = rv.Index(i).Interface()
}
return EncodeSlice(elements)
}
return nil, errors.New(fmt.Sprintf("kope: cannot encode values of type %s", rt.Name()))
}
// Encode a value
func encode(value interface{}) ([]byte, error) {
return EncodeValue(reflect.ValueOf(value))
}
// Encode values
func Encode(values ...interface{}) ([]byte, error) {
if len(values) == 0 {
return nil, errors.New("nothing to encode")
}
if len(values) == 1 {
return encode(values[0])
} else {
return encode(values)
}
}