mirror of https://github.com/goccy/go-json.git
124 lines
2.9 KiB
Go
124 lines
2.9 KiB
Go
package decoder
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import (
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"encoding/json"
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"strconv"
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"unsafe"
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"github.com/goccy/go-json/internal/errors"
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)
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type numberDecoder struct {
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stringDecoder *stringDecoder
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op func(unsafe.Pointer, json.Number)
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structName string
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fieldName string
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}
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func newNumberDecoder(structName, fieldName string, op func(unsafe.Pointer, json.Number)) *numberDecoder {
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return &numberDecoder{
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stringDecoder: newStringDecoder(structName, fieldName),
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op: op,
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structName: structName,
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fieldName: fieldName,
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}
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}
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func (d *numberDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
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bytes, err := d.decodeStreamByte(s)
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if err != nil {
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return err
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}
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if _, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&bytes)), 64); err != nil {
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return errors.ErrSyntax(err.Error(), s.totalOffset())
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}
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d.op(p, json.Number(string(bytes)))
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s.reset()
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return nil
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}
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func (d *numberDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
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bytes, c, err := d.decodeByte(ctx.Buf, cursor)
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if err != nil {
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return 0, err
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}
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if _, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&bytes)), 64); err != nil {
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return 0, errors.ErrSyntax(err.Error(), c)
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}
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cursor = c
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s := *(*string)(unsafe.Pointer(&bytes))
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d.op(p, json.Number(s))
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return cursor, nil
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}
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func (d *numberDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
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bytes, c, err := d.decodeByte(ctx.Buf, cursor)
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if err != nil {
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return nil, 0, err
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}
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if bytes == nil {
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return [][]byte{nullbytes}, c, nil
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}
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return [][]byte{bytes}, c, nil
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}
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func (d *numberDecoder) decodeStreamByte(s *Stream) ([]byte, error) {
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start := s.cursor
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for {
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switch s.char() {
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case ' ', '\n', '\t', '\r':
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s.cursor++
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continue
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case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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return floatBytes(s), nil
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case 'n':
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if err := nullBytes(s); err != nil {
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return nil, err
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}
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return nil, nil
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case '"':
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return d.stringDecoder.decodeStreamByte(s)
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case nul:
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if s.read() {
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continue
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}
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goto ERROR
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default:
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goto ERROR
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}
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}
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ERROR:
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if s.cursor == start {
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return nil, errors.ErrInvalidBeginningOfValue(s.char(), s.totalOffset())
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}
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return nil, errors.ErrUnexpectedEndOfJSON("json.Number", s.totalOffset())
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}
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func (d *numberDecoder) decodeByte(buf []byte, cursor int64) ([]byte, int64, error) {
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for {
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switch buf[cursor] {
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case ' ', '\n', '\t', '\r':
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cursor++
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continue
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case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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start := cursor
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cursor++
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for floatTable[buf[cursor]] {
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cursor++
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}
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num := buf[start:cursor]
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return num, cursor, nil
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case 'n':
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if err := validateNull(buf, cursor); err != nil {
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return nil, 0, err
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}
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cursor += 4
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return nil, cursor, nil
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case '"':
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return d.stringDecoder.decodeByte(buf, cursor)
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default:
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return nil, 0, errors.ErrUnexpectedEndOfJSON("json.Number", cursor)
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}
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}
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}
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