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gitea/vendor/github.com/tinylib/msgp/msgp/json.go
2018-05-19 20:49:46 +08:00

543 lines
9.0 KiB
Go

package msgp
import (
"bufio"
"encoding/base64"
"encoding/json"
"io"
"strconv"
"unicode/utf8"
)
var (
null = []byte("null")
hex = []byte("0123456789abcdef")
)
var defuns [_maxtype]func(jsWriter, *Reader) (int, error)
// note: there is an initialization loop if
// this isn't set up during init()
func init() {
// since none of these functions are inline-able,
// there is not much of a penalty to the indirect
// call. however, this is best expressed as a jump-table...
defuns = [_maxtype]func(jsWriter, *Reader) (int, error){
StrType: rwString,
BinType: rwBytes,
MapType: rwMap,
ArrayType: rwArray,
Float64Type: rwFloat64,
Float32Type: rwFloat32,
BoolType: rwBool,
IntType: rwInt,
UintType: rwUint,
NilType: rwNil,
ExtensionType: rwExtension,
Complex64Type: rwExtension,
Complex128Type: rwExtension,
TimeType: rwTime,
}
}
// this is the interface
// used to write json
type jsWriter interface {
io.Writer
io.ByteWriter
WriteString(string) (int, error)
}
// CopyToJSON reads MessagePack from 'src' and copies it
// as JSON to 'dst' until EOF.
func CopyToJSON(dst io.Writer, src io.Reader) (n int64, err error) {
r := NewReader(src)
n, err = r.WriteToJSON(dst)
freeR(r)
return
}
// WriteToJSON translates MessagePack from 'r' and writes it as
// JSON to 'w' until the underlying reader returns io.EOF. It returns
// the number of bytes written, and an error if it stopped before EOF.
func (r *Reader) WriteToJSON(w io.Writer) (n int64, err error) {
var j jsWriter
var bf *bufio.Writer
if jsw, ok := w.(jsWriter); ok {
j = jsw
} else {
bf = bufio.NewWriter(w)
j = bf
}
var nn int
for err == nil {
nn, err = rwNext(j, r)
n += int64(nn)
}
if err != io.EOF {
if bf != nil {
bf.Flush()
}
return
}
err = nil
if bf != nil {
err = bf.Flush()
}
return
}
func rwNext(w jsWriter, src *Reader) (int, error) {
t, err := src.NextType()
if err != nil {
return 0, err
}
return defuns[t](w, src)
}
func rwMap(dst jsWriter, src *Reader) (n int, err error) {
var comma bool
var sz uint32
var field []byte
sz, err = src.ReadMapHeader()
if err != nil {
return
}
if sz == 0 {
return dst.WriteString("{}")
}
err = dst.WriteByte('{')
if err != nil {
return
}
n++
var nn int
for i := uint32(0); i < sz; i++ {
if comma {
err = dst.WriteByte(',')
if err != nil {
return
}
n++
}
field, err = src.ReadMapKeyPtr()
if err != nil {
return
}
nn, err = rwquoted(dst, field)
n += nn
if err != nil {
return
}
err = dst.WriteByte(':')
if err != nil {
return
}
n++
nn, err = rwNext(dst, src)
n += nn
if err != nil {
return
}
if !comma {
comma = true
}
}
err = dst.WriteByte('}')
if err != nil {
return
}
n++
return
}
func rwArray(dst jsWriter, src *Reader) (n int, err error) {
err = dst.WriteByte('[')
if err != nil {
return
}
var sz uint32
var nn int
sz, err = src.ReadArrayHeader()
if err != nil {
return
}
comma := false
for i := uint32(0); i < sz; i++ {
if comma {
err = dst.WriteByte(',')
if err != nil {
return
}
n++
}
nn, err = rwNext(dst, src)
n += nn
if err != nil {
return
}
comma = true
}
err = dst.WriteByte(']')
if err != nil {
return
}
n++
return
}
func rwNil(dst jsWriter, src *Reader) (int, error) {
err := src.ReadNil()
if err != nil {
return 0, err
}
return dst.Write(null)
}
func rwFloat32(dst jsWriter, src *Reader) (int, error) {
f, err := src.ReadFloat32()
if err != nil {
return 0, err
}
src.scratch = strconv.AppendFloat(src.scratch[:0], float64(f), 'f', -1, 64)
return dst.Write(src.scratch)
}
func rwFloat64(dst jsWriter, src *Reader) (int, error) {
f, err := src.ReadFloat64()
if err != nil {
return 0, err
}
src.scratch = strconv.AppendFloat(src.scratch[:0], f, 'f', -1, 32)
return dst.Write(src.scratch)
}
func rwInt(dst jsWriter, src *Reader) (int, error) {
i, err := src.ReadInt64()
if err != nil {
return 0, err
}
src.scratch = strconv.AppendInt(src.scratch[:0], i, 10)
return dst.Write(src.scratch)
}
func rwUint(dst jsWriter, src *Reader) (int, error) {
u, err := src.ReadUint64()
if err != nil {
return 0, err
}
src.scratch = strconv.AppendUint(src.scratch[:0], u, 10)
return dst.Write(src.scratch)
}
func rwBool(dst jsWriter, src *Reader) (int, error) {
b, err := src.ReadBool()
if err != nil {
return 0, err
}
if b {
return dst.WriteString("true")
}
return dst.WriteString("false")
}
func rwTime(dst jsWriter, src *Reader) (int, error) {
t, err := src.ReadTime()
if err != nil {
return 0, err
}
bts, err := t.MarshalJSON()
if err != nil {
return 0, err
}
return dst.Write(bts)
}
func rwExtension(dst jsWriter, src *Reader) (n int, err error) {
et, err := src.peekExtensionType()
if err != nil {
return 0, err
}
// registered extensions can override
// the JSON encoding
if j, ok := extensionReg[et]; ok {
var bts []byte
e := j()
err = src.ReadExtension(e)
if err != nil {
return
}
bts, err = json.Marshal(e)
if err != nil {
return
}
return dst.Write(bts)
}
e := RawExtension{}
e.Type = et
err = src.ReadExtension(&e)
if err != nil {
return
}
var nn int
err = dst.WriteByte('{')
if err != nil {
return
}
n++
nn, err = dst.WriteString(`"type:"`)
n += nn
if err != nil {
return
}
src.scratch = strconv.AppendInt(src.scratch[0:0], int64(e.Type), 10)
nn, err = dst.Write(src.scratch)
n += nn
if err != nil {
return
}
nn, err = dst.WriteString(`,"data":"`)
n += nn
if err != nil {
return
}
enc := base64.NewEncoder(base64.StdEncoding, dst)
nn, err = enc.Write(e.Data)
n += nn
if err != nil {
return
}
err = enc.Close()
if err != nil {
return
}
nn, err = dst.WriteString(`"}`)
n += nn
return
}
func rwString(dst jsWriter, src *Reader) (n int, err error) {
var p []byte
p, err = src.R.Peek(1)
if err != nil {
return
}
lead := p[0]
var read int
if isfixstr(lead) {
read = int(rfixstr(lead))
src.R.Skip(1)
goto write
}
switch lead {
case mstr8:
p, err = src.R.Next(2)
if err != nil {
return
}
read = int(uint8(p[1]))
case mstr16:
p, err = src.R.Next(3)
if err != nil {
return
}
read = int(big.Uint16(p[1:]))
case mstr32:
p, err = src.R.Next(5)
if err != nil {
return
}
read = int(big.Uint32(p[1:]))
default:
err = badPrefix(StrType, lead)
return
}
write:
p, err = src.R.Next(read)
if err != nil {
return
}
n, err = rwquoted(dst, p)
return
}
func rwBytes(dst jsWriter, src *Reader) (n int, err error) {
var nn int
err = dst.WriteByte('"')
if err != nil {
return
}
n++
src.scratch, err = src.ReadBytes(src.scratch[:0])
if err != nil {
return
}
enc := base64.NewEncoder(base64.StdEncoding, dst)
nn, err = enc.Write(src.scratch)
n += nn
if err != nil {
return
}
err = enc.Close()
if err != nil {
return
}
err = dst.WriteByte('"')
if err != nil {
return
}
n++
return
}
// Below (c) The Go Authors, 2009-2014
// Subject to the BSD-style license found at http://golang.org
//
// see: encoding/json/encode.go:(*encodeState).stringbytes()
func rwquoted(dst jsWriter, s []byte) (n int, err error) {
var nn int
err = dst.WriteByte('"')
if err != nil {
return
}
n++
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
i++
continue
}
if start < i {
nn, err = dst.Write(s[start:i])
n += nn
if err != nil {
return
}
}
switch b {
case '\\', '"':
err = dst.WriteByte('\\')
if err != nil {
return
}
n++
err = dst.WriteByte(b)
if err != nil {
return
}
n++
case '\n':
err = dst.WriteByte('\\')
if err != nil {
return
}
n++
err = dst.WriteByte('n')
if err != nil {
return
}
n++
case '\r':
err = dst.WriteByte('\\')
if err != nil {
return
}
n++
err = dst.WriteByte('r')
if err != nil {
return
}
n++
default:
nn, err = dst.WriteString(`\u00`)
n += nn
if err != nil {
return
}
err = dst.WriteByte(hex[b>>4])
if err != nil {
return
}
n++
err = dst.WriteByte(hex[b&0xF])
if err != nil {
return
}
n++
}
i++
start = i
continue
}
c, size := utf8.DecodeRune(s[i:])
if c == utf8.RuneError && size == 1 {
if start < i {
nn, err = dst.Write(s[start:i])
n += nn
if err != nil {
return
}
nn, err = dst.WriteString(`\ufffd`)
n += nn
if err != nil {
return
}
i += size
start = i
continue
}
}
if c == '\u2028' || c == '\u2029' {
if start < i {
nn, err = dst.Write(s[start:i])
n += nn
if err != nil {
return
}
nn, err = dst.WriteString(`\u202`)
n += nn
if err != nil {
return
}
err = dst.WriteByte(hex[c&0xF])
if err != nil {
return
}
n++
}
}
i += size
}
if start < len(s) {
nn, err = dst.Write(s[start:])
n += nn
if err != nil {
return
}
}
err = dst.WriteByte('"')
if err != nil {
return
}
n++
return
}