func (j *LimitOrderCreateOperation) UnmarshalJSONFFLexer(fs *fflib.FFLexer, state fflib.FFParseState) error {
	var err error
	currentKey := ffjtLimitOrderCreateOperationbase
	_ = 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 = ffjtLimitOrderCreateOperationnosuchkey
				state = fflib.FFParse_want_colon
				goto mainparse
			} else {
				switch kn[0] {
				case 'a':
					if bytes.Equal(ffjKeyLimitOrderCreateOperationAmountToSell, kn) {
						currentKey = ffjtLimitOrderCreateOperationAmountToSell
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'e':
					if bytes.Equal(ffjKeyLimitOrderCreateOperationExpiration, kn) {
						currentKey = ffjtLimitOrderCreateOperationExpiration
						state = fflib.FFParse_want_colon
						goto mainparse
					} else if bytes.Equal(ffjKeyLimitOrderCreateOperationExtensions, kn) {
						currentKey = ffjtLimitOrderCreateOperationExtensions
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'f':
					if bytes.Equal(ffjKeyLimitOrderCreateOperationFillOrKill, kn) {
						currentKey = ffjtLimitOrderCreateOperationFillOrKill
						state = fflib.FFParse_want_colon
						goto mainparse
					} else if bytes.Equal(ffjKeyLimitOrderCreateOperationFee, kn) {
						currentKey = ffjtLimitOrderCreateOperationFee
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'm':
					if bytes.Equal(ffjKeyLimitOrderCreateOperationMinToReceive, kn) {
						currentKey = ffjtLimitOrderCreateOperationMinToReceive
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 's':
					if bytes.Equal(ffjKeyLimitOrderCreateOperationSeller, kn) {
						currentKey = ffjtLimitOrderCreateOperationSeller
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				}
				if fflib.SimpleLetterEqualFold(ffjKeyLimitOrderCreateOperationFee, kn) {
					currentKey = ffjtLimitOrderCreateOperationFee
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyLimitOrderCreateOperationExtensions, kn) {
					currentKey = ffjtLimitOrderCreateOperationExtensions
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyLimitOrderCreateOperationFillOrKill, kn) {
					currentKey = ffjtLimitOrderCreateOperationFillOrKill
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.SimpleLetterEqualFold(ffjKeyLimitOrderCreateOperationExpiration, kn) {
					currentKey = ffjtLimitOrderCreateOperationExpiration
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.AsciiEqualFold(ffjKeyLimitOrderCreateOperationMinToReceive, kn) {
					currentKey = ffjtLimitOrderCreateOperationMinToReceive
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyLimitOrderCreateOperationAmountToSell, kn) {
					currentKey = ffjtLimitOrderCreateOperationAmountToSell
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyLimitOrderCreateOperationSeller, kn) {
					currentKey = ffjtLimitOrderCreateOperationSeller
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				currentKey = ffjtLimitOrderCreateOperationnosuchkey
				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 ffjtLimitOrderCreateOperationSeller:
					goto handle_Seller
				case ffjtLimitOrderCreateOperationAmountToSell:
					goto handle_AmountToSell
				case ffjtLimitOrderCreateOperationMinToReceive:
					goto handle_MinToReceive
				case ffjtLimitOrderCreateOperationExpiration:
					goto handle_Expiration
				case ffjtLimitOrderCreateOperationFillOrKill:
					goto handle_FillOrKill
				case ffjtLimitOrderCreateOperationExtensions:
					goto handle_Extensions
				case ffjtLimitOrderCreateOperationFee:
					goto handle_Fee
				case ffjtLimitOrderCreateOperationnosuchkey:
					err = fs.SkipField(tok)
					if err != nil {
						return fs.WrapErr(err)
					}
					state = fflib.FFParse_after_value
					goto mainparse
				}
			} else {
				goto wantedvalue
			}
		}
	}
handle_Seller:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Seller.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_AmountToSell:
	{
		tbuf, err := fs.CaptureField(tok)
		if err != nil {
			return fs.WrapErr(err)
		}
		err = json.Unmarshal(tbuf, &j.AmountToSell)
		if err != nil {
			return fs.WrapErr(err)
		}
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_MinToReceive:
	{
		tbuf, err := fs.CaptureField(tok)
		if err != nil {
			return fs.WrapErr(err)
		}
		err = json.Unmarshal(tbuf, &j.MinToReceive)
		if err != nil {
			return fs.WrapErr(err)
		}
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Expiration:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Expiration.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_FillOrKill:
	{
		if tok != fflib.FFTok_bool && tok != fflib.FFTok_null {
			return fs.WrapErr(fmt.Errorf("cannot unmarshal %s into Go value for bool", tok))
		}
	}
	{
		if tok == fflib.FFTok_null {
		} else {
			tmpb := fs.Output.Bytes()
			if bytes.Compare([]byte{'t', 'r', 'u', 'e'}, tmpb) == 0 {
				j.FillOrKill = true
			} else if bytes.Compare([]byte{'f', 'a', 'l', 's', 'e'}, tmpb) == 0 {
				j.FillOrKill = false
			} else {
				err = errors.New("unexpected bytes for true/false value")
				return fs.WrapErr(err)
			}
		}
	}
	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_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"
	"errors"
	"fmt"
	fflib "github.com/pquerna/ffjson/fflib/v1"
)
func (j *LimitOrderCreateOperation) 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 *LimitOrderCreateOperation) MarshalJSONBuf(buf fflib.EncodingBuffer) error {
	if j == nil {
		buf.WriteString("null")
		return nil
	}
	var err error
	var obj []byte
	_ = obj
	_ = err
	buf.WriteString(`{ "seller":`)
	{
		obj, err = j.Seller.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	buf.WriteString(`,"amount_to_sell":`)
	err = buf.Encode(&j.AmountToSell)
	if err != nil {
		return err
	}
	buf.WriteString(`,"min_to_receive":`)
	err = buf.Encode(&j.MinToReceive)
	if err != nil {
		return err
	}
	buf.WriteString(`,"expiration":`)
	{
		obj, err = j.Expiration.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	if j.FillOrKill {
		buf.WriteString(`,"fill_or_kill":true`)
	} else {
		buf.WriteString(`,"fill_or_kill":false`)
	}
	buf.WriteString(`,"extensions":`)
	{
		obj, err = j.Extensions.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	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 (
	ffjtLimitOrderCreateOperationbase = iota
	ffjtLimitOrderCreateOperationnosuchkey
	ffjtLimitOrderCreateOperationSeller
	ffjtLimitOrderCreateOperationAmountToSell
	ffjtLimitOrderCreateOperationMinToReceive
	ffjtLimitOrderCreateOperationExpiration
	ffjtLimitOrderCreateOperationFillOrKill
	ffjtLimitOrderCreateOperationExtensions
	ffjtLimitOrderCreateOperationFee
)
var ffjKeyLimitOrderCreateOperationSeller = []byte("seller")
var ffjKeyLimitOrderCreateOperationAmountToSell = []byte("amount_to_sell")
var ffjKeyLimitOrderCreateOperationMinToReceive = []byte("min_to_receive")
var ffjKeyLimitOrderCreateOperationExpiration = []byte("expiration")
var ffjKeyLimitOrderCreateOperationFillOrKill = []byte("fill_or_kill")
var ffjKeyLimitOrderCreateOperationExtensions = []byte("extensions")
var ffjKeyLimitOrderCreateOperationFee = []byte("fee")
func (j *LimitOrderCreateOperation) UnmarshalJSON(input []byte) error {
	fs := fflib.NewFFLexer(input)
	return j.UnmarshalJSONFFLexer(fs, fflib.FFParse_map_start)
}