forked from mirror/go-json
119 lines
2.9 KiB
Go
119 lines
2.9 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 numberDecoder struct {
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stringDecoder *stringDecoder
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op func(unsafe.Pointer, 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, 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 &SyntaxError{msg: err.Error(), Offset: s.totalOffset()}
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}
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d.op(p, 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(buf []byte, cursor, depth int64, p unsafe.Pointer) (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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if _, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&bytes)), 64); err != nil {
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return 0, &SyntaxError{msg: err.Error(), Offset: 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, Number(s))
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return cursor, nil
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}
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func (d *numberDecoder) 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 '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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return nil, 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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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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if floatTable[buf[cursor]] {
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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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case 'n':
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if cursor+3 >= buflen {
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return nil, 0, errUnexpectedEndOfJSON("null", cursor)
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}
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if buf[cursor+1] != 'u' {
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return nil, 0, errInvalidCharacter(buf[cursor+1], "null", cursor)
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}
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if buf[cursor+2] != 'l' {
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return nil, 0, errInvalidCharacter(buf[cursor+2], "null", cursor)
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}
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if buf[cursor+3] != 'l' {
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return nil, 0, errInvalidCharacter(buf[cursor+3], "null", cursor)
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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, errUnexpectedEndOfJSON("json.Number", cursor)
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}
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}
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return nil, 0, errUnexpectedEndOfJSON("json.Number", cursor)
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}
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