func (j *OrderBook) UnmarshalJSONFFLexer(fs *fflib.FFLexer, state fflib.FFParseState) error {
	var err error
	currentKey := ffjtOrderBookbase
	_ = 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 = ffjtOrderBooknosuchkey
				state = fflib.FFParse_want_colon
				goto mainparse
			} else {
				switch kn[0] {
				case 'a':
					if bytes.Equal(ffjKeyOrderBookAsks, kn) {
						currentKey = ffjtOrderBookAsks
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'b':
					if bytes.Equal(ffjKeyOrderBookBase, kn) {
						currentKey = ffjtOrderBookBase
						state = fflib.FFParse_want_colon
						goto mainparse
					} else if bytes.Equal(ffjKeyOrderBookBids, kn) {
						currentKey = ffjtOrderBookBids
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'q':
					if bytes.Equal(ffjKeyOrderBookQuote, kn) {
						currentKey = ffjtOrderBookQuote
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				}
				if fflib.EqualFoldRight(ffjKeyOrderBookBids, kn) {
					currentKey = ffjtOrderBookBids
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.SimpleLetterEqualFold(ffjKeyOrderBookQuote, kn) {
					currentKey = ffjtOrderBookQuote
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyOrderBookAsks, kn) {
					currentKey = ffjtOrderBookAsks
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyOrderBookBase, kn) {
					currentKey = ffjtOrderBookBase
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				currentKey = ffjtOrderBooknosuchkey
				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 ffjtOrderBookBase:
					goto handle_Base
				case ffjtOrderBookAsks:
					goto handle_Asks
				case ffjtOrderBookQuote:
					goto handle_Quote
				case ffjtOrderBookBids:
					goto handle_Bids
				case ffjtOrderBooknosuchkey:
					err = fs.SkipField(tok)
					if err != nil {
						return fs.WrapErr(err)
					}
					state = fflib.FFParse_after_value
					goto mainparse
				}
			} else {
				goto wantedvalue
			}
		}
	}
handle_Base:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Base.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Asks:
	{
		{
			if tok != fflib.FFTok_left_brace && tok != fflib.FFTok_null {
				return fs.WrapErr(fmt.Errorf("cannot unmarshal %s into Go value for ", tok))
			}
		}
		if tok == fflib.FFTok_null {
			j.Asks = nil
		} else {
			j.Asks = []Order{}
			wantVal := true
			for {
				var tmpJAsks Order
				tok = fs.Scan()
				if tok == fflib.FFTok_error {
					goto tokerror
				}
				if tok == fflib.FFTok_right_brace {
					break
				}
				if tok == fflib.FFTok_comma {
					if wantVal == true {
						return fs.WrapErr(fmt.Errorf("wanted value token, but got token: %v", tok))
					}
					continue
				} else {
					wantVal = true
				}
				{
					if tok == fflib.FFTok_null {
					} else {
						err = tmpJAsks.UnmarshalJSONFFLexer(fs, fflib.FFParse_want_key)
						if err != nil {
							return err
						}
					}
					state = fflib.FFParse_after_value
				}
				j.Asks = append(j.Asks, tmpJAsks)
				wantVal = false
			}
		}
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Quote:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Quote.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Bids:
	{
		{
			if tok != fflib.FFTok_left_brace && tok != fflib.FFTok_null {
				return fs.WrapErr(fmt.Errorf("cannot unmarshal %s into Go value for ", tok))
			}
		}
		if tok == fflib.FFTok_null {
			j.Bids = nil
		} else {
			j.Bids = []Order{}
			wantVal := true
			for {
				var tmpJBids Order
				tok = fs.Scan()
				if tok == fflib.FFTok_error {
					goto tokerror
				}
				if tok == fflib.FFTok_right_brace {
					break
				}
				if tok == fflib.FFTok_comma {
					if wantVal == true {
						return fs.WrapErr(fmt.Errorf("wanted value token, but got token: %v", tok))
					}
					continue
				} else {
					wantVal = true
				}
				{
					if tok == fflib.FFTok_null {
					} else {
						err = tmpJBids.UnmarshalJSONFFLexer(fs, fflib.FFParse_want_key)
						if err != nil {
							return err
						}
					}
					state = fflib.FFParse_after_value
				}
				j.Bids = append(j.Bids, tmpJBids)
				wantVal = false
			}
		}
	}
	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 types
import (
	"bytes"
	"fmt"
	fflib "github.com/pquerna/ffjson/fflib/v1"
)
func (j *Order) 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 *Order) MarshalJSONBuf(buf fflib.EncodingBuffer) error {
	if j == nil {
		buf.WriteString("null")
		return nil
	}
	var err error
	var obj []byte
	_ = obj
	_ = err
	buf.WriteString(`{"base":`)
	fflib.AppendFloat(buf, float64(j.Base), 'g', -1, 64)
	buf.WriteString(`,"quote":`)
	fflib.AppendFloat(buf, float64(j.Quote), 'g', -1, 64)
	buf.WriteString(`,"price":`)
	fflib.AppendFloat(buf, float64(j.Price), 'g', -1, 64)
	buf.WriteByte('}')
	return nil
}
const (
	ffjtOrderbase = iota
	ffjtOrdernosuchkey
	ffjtOrderBase
	ffjtOrderQuote
	ffjtOrderPrice
)
var ffjKeyOrderBase = []byte("base")
var ffjKeyOrderQuote = []byte("quote")
var ffjKeyOrderPrice = []byte("price")
func (j *Order) UnmarshalJSON(input []byte) error {
	fs := fflib.NewFFLexer(input)
	return j.UnmarshalJSONFFLexer(fs, fflib.FFParse_map_start)
}
func (j *Order) UnmarshalJSONFFLexer(fs *fflib.FFLexer, state fflib.FFParseState) error {
	var err error
	currentKey := ffjtOrderbase
	_ = 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 = ffjtOrdernosuchkey
				state = fflib.FFParse_want_colon
				goto mainparse
			} else {
				switch kn[0] {
				case 'b':
					if bytes.Equal(ffjKeyOrderBase, kn) {
						currentKey = ffjtOrderBase
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'p':
					if bytes.Equal(ffjKeyOrderPrice, kn) {
						currentKey = ffjtOrderPrice
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				case 'q':
					if bytes.Equal(ffjKeyOrderQuote, kn) {
						currentKey = ffjtOrderQuote
						state = fflib.FFParse_want_colon
						goto mainparse
					}
				}
				if fflib.SimpleLetterEqualFold(ffjKeyOrderPrice, kn) {
					currentKey = ffjtOrderPrice
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.SimpleLetterEqualFold(ffjKeyOrderQuote, kn) {
					currentKey = ffjtOrderQuote
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				if fflib.EqualFoldRight(ffjKeyOrderBase, kn) {
					currentKey = ffjtOrderBase
					state = fflib.FFParse_want_colon
					goto mainparse
				}
				currentKey = ffjtOrdernosuchkey
				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 ffjtOrderBase:
					goto handle_Base
				case ffjtOrderQuote:
					goto handle_Quote
				case ffjtOrderPrice:
					goto handle_Price
				case ffjtOrdernosuchkey:
					err = fs.SkipField(tok)
					if err != nil {
						return fs.WrapErr(err)
					}
					state = fflib.FFParse_after_value
					goto mainparse
				}
			} else {
				goto wantedvalue
			}
		}
	}
handle_Base:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Base.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Quote:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Quote.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	state = fflib.FFParse_after_value
	goto mainparse
handle_Price:
	{
		if tok == fflib.FFTok_null {
		} else {
			tbuf, err := fs.CaptureField(tok)
			if err != nil {
				return fs.WrapErr(err)
			}
			err = j.Price.UnmarshalJSON(tbuf)
			if err != nil {
				return fs.WrapErr(err)
			}
		}
		state = fflib.FFParse_after_value
	}
	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
}
func (j *OrderBook) 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 *OrderBook) MarshalJSONBuf(buf fflib.EncodingBuffer) error {
	if j == nil {
		buf.WriteString("null")
		return nil
	}
	var err error
	var obj []byte
	_ = obj
	_ = err
	buf.WriteString(`{"base":`)
	{
		obj, err = j.Base.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	buf.WriteString(`,"asks":`)
	if j.Asks != nil {
		buf.WriteString(`[`)
		for i, v := range j.Asks {
			if i != 0 {
				buf.WriteString(`,`)
			}
			{
				err = v.MarshalJSONBuf(buf)
				if err != nil {
					return err
				}
			}
		}
		buf.WriteString(`]`)
	} else {
		buf.WriteString(`null`)
	}
	buf.WriteString(`,"quote":`)
	{
		obj, err = j.Quote.MarshalJSON()
		if err != nil {
			return err
		}
		buf.Write(obj)
	}
	buf.WriteString(`,"bids":`)
	if j.Bids != nil {
		buf.WriteString(`[`)
		for i, v := range j.Bids {
			if i != 0 {
				buf.WriteString(`,`)
			}
			{
				err = v.MarshalJSONBuf(buf)
				if err != nil {
					return err
				}
			}
		}
		buf.WriteString(`]`)
	} else {
		buf.WriteString(`null`)
	}
	buf.WriteByte('}')
	return nil
}
const (
	ffjtOrderBookbase = iota
	ffjtOrderBooknosuchkey
	ffjtOrderBookBase
	ffjtOrderBookAsks
	ffjtOrderBookQuote
	ffjtOrderBookBids
)
var ffjKeyOrderBookBase = []byte("base")
var ffjKeyOrderBookAsks = []byte("asks")
var ffjKeyOrderBookQuote = []byte("quote")
var ffjKeyOrderBookBids = []byte("bids")
func (j *OrderBook) UnmarshalJSON(input []byte) error {
	fs := fflib.NewFFLexer(input)
	return j.UnmarshalJSONFFLexer(fs, fflib.FFParse_map_start)
}