forked from mirror/go-json
125 lines
2.4 KiB
Go
125 lines
2.4 KiB
Go
package json
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import (
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"strconv"
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"unsafe"
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)
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type floatDecoder struct {
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op func(uintptr, float64)
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}
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func newFloatDecoder(op func(uintptr, float64)) *floatDecoder {
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return &floatDecoder{op: op}
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}
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var floatTable = [256]bool{
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'0': true,
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'1': true,
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'2': true,
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'3': true,
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'4': true,
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'5': true,
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'6': true,
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'7': true,
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'8': true,
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'9': true,
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'.': true,
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'e': true,
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'E': true,
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}
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func floatBytes(s *stream) []byte {
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start := s.cursor
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for {
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s.cursor++
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if floatTable[s.char()] {
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continue
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} else if s.char() == nul {
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if s.read() {
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s.cursor-- // for retry current character
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continue
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}
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}
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break
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}
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return s.buf[start:s.cursor]
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}
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func (d *floatDecoder) setDisallowUnknownFields(_ bool) {}
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func (d *floatDecoder) decodeStreamByte(s *stream) ([]byte, error) {
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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 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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return nil, errUnexpectedEndOfJSON("float", s.totalOffset())
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}
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func (d *floatDecoder) decodeByte(buf []byte, cursor int64) ([]byte, int64, error) {
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buflen := int64(len(buf))
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for ; cursor < buflen; cursor++ {
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switch buf[cursor] {
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case ' ', '\n', '\t', '\r':
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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 ; cursor < buflen; cursor++ {
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tk := int(buf[cursor])
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if (int('0') <= tk && tk <= int('9')) || tk == '.' || tk == 'e' || tk == 'E' {
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continue
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}
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break
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}
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num := buf[start:cursor]
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return num, cursor, nil
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default:
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return nil, 0, errUnexpectedEndOfJSON("float", cursor)
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}
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}
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return nil, 0, errUnexpectedEndOfJSON("float", cursor)
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}
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func (d *floatDecoder) decodeStream(s *stream, p uintptr) 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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str := *(*string)(unsafe.Pointer(&bytes))
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f64, err := strconv.ParseFloat(str, 64)
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if err != nil {
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return err
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}
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d.op(p, f64)
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return nil
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}
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func (d *floatDecoder) decode(buf []byte, cursor int64, p uintptr) (int64, error) {
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bytes, c, err := d.decodeByte(buf, cursor)
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if err != nil {
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return 0, err
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}
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cursor = c
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s := *(*string)(unsafe.Pointer(&bytes))
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f64, err := strconv.ParseFloat(s, 64)
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if err != nil {
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return 0, err
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}
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d.op(p, f64)
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return cursor, nil
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}
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