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|
package decoder
import (
"strconv"
"unsafe"
"github.com/goccy/go-json/internal/errors"
)
type floatDecoder struct {
op func(unsafe.Pointer, float64)
structName string
fieldName string
}
func newFloatDecoder(structName, fieldName string, op func(unsafe.Pointer, float64)) *floatDecoder {
return &floatDecoder{op: op, structName: structName, fieldName: fieldName}
}
var (
floatTable = [256]bool{
'0': true,
'1': true,
'2': true,
'3': true,
'4': true,
'5': true,
'6': true,
'7': true,
'8': true,
'9': true,
'.': true,
'e': true,
'E': true,
'+': true,
'-': true,
}
validEndNumberChar = [256]bool{
nul: true,
' ': true,
'\t': true,
'\r': true,
'\n': true,
',': true,
':': true,
'}': true,
']': true,
}
)
func floatBytes(s *Stream) []byte {
start := s.cursor
for {
s.cursor++
if floatTable[s.char()] {
continue
} else if s.char() == nul {
if s.read() {
s.cursor-- // for retry current character
continue
}
}
break
}
return s.buf[start:s.cursor]
}
func (d *floatDecoder) decodeStreamByte(s *Stream) ([]byte, error) {
for {
switch s.char() {
case ' ', '\n', '\t', '\r':
s.cursor++
continue
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
return floatBytes(s), nil
case 'n':
if err := nullBytes(s); err != nil {
return nil, err
}
return nil, nil
case nul:
if s.read() {
continue
}
goto ERROR
default:
goto ERROR
}
}
ERROR:
return nil, errors.ErrUnexpectedEndOfJSON("float", s.totalOffset())
}
func (d *floatDecoder) decodeByte(buf []byte, cursor int64) ([]byte, int64, error) {
for {
switch buf[cursor] {
case ' ', '\n', '\t', '\r':
cursor++
continue
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
start := cursor
cursor++
for floatTable[buf[cursor]] {
cursor++
}
num := buf[start:cursor]
return num, cursor, nil
case 'n':
if err := validateNull(buf, cursor); err != nil {
return nil, 0, err
}
cursor += 4
return nil, cursor, nil
default:
return nil, 0, errors.ErrUnexpectedEndOfJSON("float", cursor)
}
}
}
func (d *floatDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
bytes, err := d.decodeStreamByte(s)
if err != nil {
return err
}
if bytes == nil {
return nil
}
str := *(*string)(unsafe.Pointer(&bytes))
f64, err := strconv.ParseFloat(str, 64)
if err != nil {
return errors.ErrSyntax(err.Error(), s.totalOffset())
}
d.op(p, f64)
return nil
}
func (d *floatDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
buf := ctx.Buf
bytes, c, err := d.decodeByte(buf, cursor)
if err != nil {
return 0, err
}
if bytes == nil {
return c, nil
}
cursor = c
if !validEndNumberChar[buf[cursor]] {
return 0, errors.ErrUnexpectedEndOfJSON("float", cursor)
}
s := *(*string)(unsafe.Pointer(&bytes))
f64, err := strconv.ParseFloat(s, 64)
if err != nil {
return 0, errors.ErrSyntax(err.Error(), cursor)
}
d.op(p, f64)
return cursor, nil
}
func (d *floatDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
buf := ctx.Buf
bytes, c, err := d.decodeByte(buf, cursor)
if err != nil {
return nil, 0, err
}
if bytes == nil {
return [][]byte{nullbytes}, c, nil
}
return [][]byte{bytes}, c, nil
}
|
