gotosocial/vendor/github.com/bytedance/sonic/ast/encode.go

259 lines
6.1 KiB
Go

/*
* Copyright 2021 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ast
import (
`sync`
`unicode/utf8`
)
const (
_MaxBuffer = 1024 // 1KB buffer size
)
func quoteString(e *[]byte, s string) {
*e = append(*e, '"')
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if safeSet[b] {
i++
continue
}
if start < i {
*e = append(*e, s[start:i]...)
}
*e = append(*e, '\\')
switch b {
case '\\', '"':
*e = append(*e, b)
case '\n':
*e = append(*e, 'n')
case '\r':
*e = append(*e, 'r')
case '\t':
*e = append(*e, 't')
default:
// This encodes bytes < 0x20 except for \t, \n and \r.
// If escapeHTML is set, it also escapes <, >, and &
// because they can lead to security holes when
// user-controlled strings are rendered into JSON
// and served to some browsers.
*e = append(*e, `u00`...)
*e = append(*e, hex[b>>4])
*e = append(*e, hex[b&0xF])
}
i++
start = i
continue
}
c, size := utf8.DecodeRuneInString(s[i:])
// if c == utf8.RuneError && size == 1 {
// if start < i {
// e.Write(s[start:i])
// }
// e.WriteString(`\ufffd`)
// i += size
// start = i
// continue
// }
if c == '\u2028' || c == '\u2029' {
if start < i {
*e = append(*e, s[start:i]...)
}
*e = append(*e, `\u202`...)
*e = append(*e, hex[c&0xF])
i += size
start = i
continue
}
i += size
}
if start < len(s) {
*e = append(*e, s[start:]...)
}
*e = append(*e, '"')
}
var bytesPool = sync.Pool{}
func (self *Node) MarshalJSON() ([]byte, error) {
buf := newBuffer()
err := self.encode(buf)
if err != nil {
freeBuffer(buf)
return nil, err
}
ret := make([]byte, len(*buf))
copy(ret, *buf)
freeBuffer(buf)
return ret, err
}
func newBuffer() *[]byte {
if ret := bytesPool.Get(); ret != nil {
return ret.(*[]byte)
} else {
buf := make([]byte, 0, _MaxBuffer)
return &buf
}
}
func freeBuffer(buf *[]byte) {
*buf = (*buf)[:0]
bytesPool.Put(buf)
}
func (self *Node) encode(buf *[]byte) error {
if self.IsRaw() {
return self.encodeRaw(buf)
}
switch self.Type() {
case V_NONE : return ErrNotExist
case V_ERROR : return self.Check()
case V_NULL : return self.encodeNull(buf)
case V_TRUE : return self.encodeTrue(buf)
case V_FALSE : return self.encodeFalse(buf)
case V_ARRAY : return self.encodeArray(buf)
case V_OBJECT: return self.encodeObject(buf)
case V_STRING: return self.encodeString(buf)
case V_NUMBER: return self.encodeNumber(buf)
case V_ANY : return self.encodeInterface(buf)
default : return ErrUnsupportType
}
}
func (self *Node) encodeRaw(buf *[]byte) error {
raw, err := self.Raw()
if err != nil {
return err
}
*buf = append(*buf, raw...)
return nil
}
func (self *Node) encodeNull(buf *[]byte) error {
*buf = append(*buf, bytesNull...)
return nil
}
func (self *Node) encodeTrue(buf *[]byte) error {
*buf = append(*buf, bytesTrue...)
return nil
}
func (self *Node) encodeFalse(buf *[]byte) error {
*buf = append(*buf, bytesFalse...)
return nil
}
func (self *Node) encodeNumber(buf *[]byte) error {
str := self.toString()
*buf = append(*buf, str...)
return nil
}
func (self *Node) encodeString(buf *[]byte) error {
if self.l == 0 {
*buf = append(*buf, '"', '"')
return nil
}
quote(buf, self.toString())
return nil
}
func (self *Node) encodeArray(buf *[]byte) error {
if self.isLazy() {
if err := self.skipAllIndex(); err != nil {
return err
}
}
nb := self.len()
if nb == 0 {
*buf = append(*buf, bytesArray...)
return nil
}
*buf = append(*buf, '[')
var started bool
for i := 0; i < nb; i++ {
n := self.nodeAt(i)
if !n.Exists() {
continue
}
if started {
*buf = append(*buf, ',')
}
started = true
if err := n.encode(buf); err != nil {
return err
}
}
*buf = append(*buf, ']')
return nil
}
func (self *Pair) encode(buf *[]byte) error {
if len(*buf) == 0 {
*buf = append(*buf, '"', '"', ':')
return self.Value.encode(buf)
}
quote(buf, self.Key)
*buf = append(*buf, ':')
return self.Value.encode(buf)
}
func (self *Node) encodeObject(buf *[]byte) error {
if self.isLazy() {
if err := self.skipAllKey(); err != nil {
return err
}
}
nb := self.len()
if nb == 0 {
*buf = append(*buf, bytesObject...)
return nil
}
*buf = append(*buf, '{')
var started bool
for i := 0; i < nb; i++ {
n := self.pairAt(i)
if n == nil || !n.Value.Exists() {
continue
}
if started {
*buf = append(*buf, ',')
}
started = true
if err := n.encode(buf); err != nil {
return err
}
}
*buf = append(*buf, '}')
return nil
}