func (j *AssetUpdateOperation) UnmarshalJSONFFLexer(fs *fflib.FFLexer, state fflib.FFParseState) error {
	var err error
	currentKey := ffjtAssetUpdateOperationbase
	_ = currentKey
	tok := fflib.FFTok_init
	wantedTok := fflib.FFTok_init
mainparse:
	for {
		tok = fs.Scan()
		if tok == fflib.FFTok_error {
			goto tokerror
		}
		switch state {
		case fflib.FFParse_map_start:
			if tok != fflib.FFTok_left_bracket {
				wantedTok = fflib.FFTok_left_bracket
				goto wrongtokenerror
			}
			state = fflib.FFParse_want_key
			continue
		case fflib.FFParse_after_value:
			if tok == fflib.FFTok_comma {
				state = fflib.FFParse_want_key
			} else if tok == fflib.FFTok_right_bracket {
				goto done
			} else {
				wantedTok = fflib.FFTok_comma
				goto wrongtokenerror
			}
		case fflib.FFParse_want_key:
			if tok == fflib.FFTok_right_bracket {
				goto done
			}
			if tok != fflib.FFTok_string {
				wantedTok = fflib.FFTok_string
				goto wrongtokenerror
			}
			kn := fs.Output.Bytes()
			if len(kn) <= 0 {
				currentKey = ffjtAssetUpdateOperationnosuchkey
				state = fflib.FFParse_want_colon
				goto mainparse
			} else {
				switch kn[0] {
				case 'a':
					if bytes.Equal(ffjKeyAssetUpdateOperationAssetToUpdate, kn) {
						currentKey = ffjtAssetUpdateOperationAssetToUpdate
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'e':
					if bytes.Equal(ffjKeyAssetUpdateOperationExtensions, kn) {
						currentKey = ffjtAssetUpdateOperationExtensions
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'f':
					if bytes.Equal(ffjKeyAssetUpdateOperationFee, kn) {
						currentKey = ffjtAssetUpdateOperationFee
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'i':
					if bytes.Equal(ffjKeyAssetUpdateOperationIssuer, kn) {
						currentKey = ffjtAssetUpdateOperationIssuer
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'n':
					if bytes.Equal(ffjKeyAssetUpdateOperationNewIssuer, kn) {
						currentKey = ffjtAssetUpdateOperationNewIssuer
						state = fflib.FFParse_want_colon
						goto mainparse
					} else if bytes.Equal(ffjKeyAssetUpdateOperationNewOptions, kn) {
						currentKey = ffjtAssetUpdateOperationNewOptions
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				}
				if fflib.SimpleLetterEqualFold(ffjKeyAssetUpdateOperationFee, kn) {
					currentKey = ffjtAssetUpdateOperationFee
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyAssetUpdateOperationNewOptions, kn) {
					currentKey = ffjtAssetUpdateOperationNewOptions
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyAssetUpdateOperationNewIssuer, kn) {
					currentKey = ffjtAssetUpdateOperationNewIssuer
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyAssetUpdateOperationExtensions, kn) {
					currentKey = ffjtAssetUpdateOperationExtensions
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyAssetUpdateOperationIssuer, kn) {
					currentKey = ffjtAssetUpdateOperationIssuer
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyAssetUpdateOperationAssetToUpdate, kn) {
					currentKey = ffjtAssetUpdateOperationAssetToUpdate
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				currentKey = ffjtAssetUpdateOperationnosuchkey
				state = fflib.FFParse_want_colon
				goto mainparse
			}
		case fflib.FFParse_want_colon:
			if tok != fflib.FFTok_colon {
				wantedTok = fflib.FFTok_colon
				goto wrongtokenerror
			}
			state = fflib.FFParse_want_value
			continue
		case fflib.FFParse_want_value:
			if tok == fflib.FFTok_left_brace || tok == fflib.FFTok_left_bracket || tok == fflib.FFTok_integer || tok == fflib.FFTok_double || tok == fflib.FFTok_string || tok == fflib.FFTok_bool || tok == fflib.FFTok_null {
				switch currentKey {
				case ffjtAssetUpdateOperationAssetToUpdate:
					goto handle_AssetToUpdate
				case ffjtAssetUpdateOperationIssuer:
					goto handle_Issuer
				case ffjtAssetUpdateOperationExtensions:
					goto handle_Extensions
				case ffjtAssetUpdateOperationNewIssuer:
					goto handle_NewIssuer
				case ffjtAssetUpdateOperationNewOptions:
					goto handle_NewOptions
				case ffjtAssetUpdateOperationFee:
					goto handle_Fee
				case ffjtAssetUpdateOperationnosuchkey:
					err = fs.SkipField(tok)
					if err != nil {
						return fs.WrapErr(err)
					}
					state = fflib.FFParse_after_value
					goto mainparse
				}
			} else {
				goto wantedvalue
			}
		}
	}
handle_AssetToUpdate:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.AssetToUpdate.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Issuer:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Issuer.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Extensions:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Extensions.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_NewIssuer:
	{
		if tok == fflib.FFTok_null {
			j.NewIssuer = nil
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			if j.NewIssuer == nil {
				j.NewIssuer = new(types.AccountID)
			}
			err = j.NewIssuer.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_NewOptions:
	{
		tbuf, err := fs.CaptureField(tok)
		if err != nil {
			return fs.WrapErr(err)
		}
		err = json.Unmarshal(tbuf, &j.NewOptions)
		if err != nil {
			return fs.WrapErr(err)
		}
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Fee:
	{
		tbuf, err := fs.CaptureField(tok)
		if err != nil {
			return fs.WrapErr(err)
		}
		err = json.Unmarshal(tbuf, &j.Fee)
		if err != nil {
			return fs.WrapErr(err)
		}
	}
	state = fflib.FFParse_after_value
	goto mainparse
wantedvalue:
	return fs.WrapErr(fmt.Errorf("wanted value token, but got token: %v", tok))
wrongtokenerror:
	return fs.WrapErr(fmt.Errorf("ffjson: wanted token: %v, but got token: %v output=%s", wantedTok, tok, fs.Output.String()))
tokerror:
	if fs.BigError != nil {
		return fs.WrapErr(fs.BigError)
	}
	err = fs.Error.ToError()
	if err != nil {
		return fs.WrapErr(err)
	}
	panic("ffjson-generated: unreachable, please report bug.")
done:
	return nil
}
UnmarshalJSONFFLexer fast json unmarshall - template ffjson
package operations
import (
	"bytes"
	"encoding/json"
	"fmt"
	"github.com/denkhaus/bitshares/types"
	fflib "github.com/pquerna/ffjson/fflib/v1"
)
func (j *AssetUpdateOperation) MarshalJSON() ([]byte, error) {
	var buf fflib.Buffer
	if j == nil {
		buf.WriteString("null")
		return buf.Bytes(), nil
	}
	err := j.MarshalJSONBuf(&buf)
	if err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}
func (j *AssetUpdateOperation) MarshalJSONBuf(buf fflib.EncodingBuffer) error {
	if j == nil {
		buf.WriteString("null")
		return nil
	}
	var err error
	var obj []byte
	_ = obj
	_ = err
	buf.WriteString(`{ "asset_to_update":`)
	{
		obj, err = j.AssetToUpdate.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	buf.WriteString(`,"issuer":`)
	{
		obj, err = j.Issuer.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	buf.WriteString(`,"extensions":`)
	{
		obj, err = j.Extensions.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	if j.NewIssuer != nil {
		buf.WriteString(`,"new_issuer":`)
		{
			obj, err = j.NewIssuer.MarshalJSON()
			if err != nil {
				return err
			}
			buf.Write(obj)
		}
	} else {
		buf.WriteString(`,"new_issuer":null`)
	}
	buf.WriteString(`,"new_options":`)
	err = buf.Encode(&j.NewOptions)
	if err != nil {
		return err
	}
	buf.WriteByte(',')
	if j.Fee != nil {
		if true {
			buf.WriteString(`"fee":`)
			err = buf.Encode(j.Fee)
			if err != nil {
				return err
			}
			buf.WriteByte(',')
		}
	}
	buf.Rewind(1)
	buf.WriteByte('}')
	return nil
}
const (
	ffjtAssetUpdateOperationbase = iota
	ffjtAssetUpdateOperationnosuchkey
	ffjtAssetUpdateOperationAssetToUpdate
	ffjtAssetUpdateOperationIssuer
	ffjtAssetUpdateOperationExtensions
	ffjtAssetUpdateOperationNewIssuer
	ffjtAssetUpdateOperationNewOptions
	ffjtAssetUpdateOperationFee
)
var ffjKeyAssetUpdateOperationAssetToUpdate = []byte("asset_to_update")
var ffjKeyAssetUpdateOperationIssuer = []byte("issuer")
var ffjKeyAssetUpdateOperationExtensions = []byte("extensions")
var ffjKeyAssetUpdateOperationNewIssuer = []byte("new_issuer")
var ffjKeyAssetUpdateOperationNewOptions = []byte("new_options")
var ffjKeyAssetUpdateOperationFee = []byte("fee")
func (j *AssetUpdateOperation) UnmarshalJSON(input []byte) error {
	fs := fflib.NewFFLexer(input)
	return j.UnmarshalJSONFFLexer(fs, fflib.FFParse_map_start)
}