mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-26 21:56:39 +00:00
256 lines
7.3 KiB
Go
256 lines
7.3 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 decoder
|
|
|
|
import (
|
|
`unsafe`
|
|
`encoding/json`
|
|
`reflect`
|
|
`runtime`
|
|
|
|
`github.com/bytedance/sonic/internal/native`
|
|
`github.com/bytedance/sonic/internal/native/types`
|
|
`github.com/bytedance/sonic/internal/rt`
|
|
`github.com/bytedance/sonic/option`
|
|
`github.com/bytedance/sonic/utf8`
|
|
)
|
|
|
|
const (
|
|
_F_use_int64 = 0
|
|
_F_disable_urc = 2
|
|
_F_disable_unknown = 3
|
|
_F_copy_string = 4
|
|
|
|
_F_use_number = types.B_USE_NUMBER
|
|
_F_validate_string = types.B_VALIDATE_STRING
|
|
_F_allow_control = types.B_ALLOW_CONTROL
|
|
)
|
|
|
|
type Options uint64
|
|
|
|
const (
|
|
OptionUseInt64 Options = 1 << _F_use_int64
|
|
OptionUseNumber Options = 1 << _F_use_number
|
|
OptionUseUnicodeErrors Options = 1 << _F_disable_urc
|
|
OptionDisableUnknown Options = 1 << _F_disable_unknown
|
|
OptionCopyString Options = 1 << _F_copy_string
|
|
OptionValidateString Options = 1 << _F_validate_string
|
|
)
|
|
|
|
func (self *Decoder) SetOptions(opts Options) {
|
|
if (opts & OptionUseNumber != 0) && (opts & OptionUseInt64 != 0) {
|
|
panic("can't set OptionUseInt64 and OptionUseNumber both!")
|
|
}
|
|
self.f = uint64(opts)
|
|
}
|
|
|
|
|
|
// Decoder is the decoder context object
|
|
type Decoder struct {
|
|
i int
|
|
f uint64
|
|
s string
|
|
}
|
|
|
|
// NewDecoder creates a new decoder instance.
|
|
func NewDecoder(s string) *Decoder {
|
|
return &Decoder{s: s}
|
|
}
|
|
|
|
// Pos returns the current decoding position.
|
|
func (self *Decoder) Pos() int {
|
|
return self.i
|
|
}
|
|
|
|
func (self *Decoder) Reset(s string) {
|
|
self.s = s
|
|
self.i = 0
|
|
// self.f = 0
|
|
}
|
|
|
|
func (self *Decoder) CheckTrailings() error {
|
|
pos := self.i
|
|
buf := self.s
|
|
/* skip all the trailing spaces */
|
|
if pos != len(buf) {
|
|
for pos < len(buf) && (types.SPACE_MASK & (1 << buf[pos])) != 0 {
|
|
pos++
|
|
}
|
|
}
|
|
|
|
/* then it must be at EOF */
|
|
if pos == len(buf) {
|
|
return nil
|
|
}
|
|
|
|
/* junk after JSON value */
|
|
return SyntaxError {
|
|
Src : buf,
|
|
Pos : pos,
|
|
Code : types.ERR_INVALID_CHAR,
|
|
}
|
|
}
|
|
|
|
|
|
// Decode parses the JSON-encoded data from current position and stores the result
|
|
// in the value pointed to by val.
|
|
func (self *Decoder) Decode(val interface{}) error {
|
|
/* validate json if needed */
|
|
if (self.f & (1 << _F_validate_string)) != 0 && !utf8.ValidateString(self.s){
|
|
dbuf := utf8.CorrectWith(nil, rt.Str2Mem(self.s), "\ufffd")
|
|
self.s = rt.Mem2Str(dbuf)
|
|
}
|
|
|
|
vv := rt.UnpackEface(val)
|
|
vp := vv.Value
|
|
|
|
/* check for nil type */
|
|
if vv.Type == nil {
|
|
return &json.InvalidUnmarshalError{}
|
|
}
|
|
|
|
/* must be a non-nil pointer */
|
|
if vp == nil || vv.Type.Kind() != reflect.Ptr {
|
|
return &json.InvalidUnmarshalError{Type: vv.Type.Pack()}
|
|
}
|
|
|
|
etp := rt.PtrElem(vv.Type)
|
|
|
|
/* check the defined pointer type for issue 379 */
|
|
if vv.Type.IsNamed() {
|
|
newp := vp
|
|
etp = vv.Type
|
|
vp = unsafe.Pointer(&newp)
|
|
}
|
|
|
|
/* create a new stack, and call the decoder */
|
|
sb := newStack()
|
|
nb, err := decodeTypedPointer(self.s, self.i, etp, vp, sb, self.f)
|
|
/* return the stack back */
|
|
self.i = nb
|
|
freeStack(sb)
|
|
|
|
/* avoid GC ahead */
|
|
runtime.KeepAlive(vv)
|
|
return err
|
|
}
|
|
|
|
// UseInt64 indicates the Decoder to unmarshal an integer into an interface{} as an
|
|
// int64 instead of as a float64.
|
|
func (self *Decoder) UseInt64() {
|
|
self.f |= 1 << _F_use_int64
|
|
self.f &^= 1 << _F_use_number
|
|
}
|
|
|
|
// UseNumber indicates the Decoder to unmarshal a number into an interface{} as a
|
|
// json.Number instead of as a float64.
|
|
func (self *Decoder) UseNumber() {
|
|
self.f &^= 1 << _F_use_int64
|
|
self.f |= 1 << _F_use_number
|
|
}
|
|
|
|
// UseUnicodeErrors indicates the Decoder to return an error when encounter invalid
|
|
// UTF-8 escape sequences.
|
|
func (self *Decoder) UseUnicodeErrors() {
|
|
self.f |= 1 << _F_disable_urc
|
|
}
|
|
|
|
// DisallowUnknownFields indicates the Decoder to return an error when the destination
|
|
// is a struct and the input contains object keys which do not match any
|
|
// non-ignored, exported fields in the destination.
|
|
func (self *Decoder) DisallowUnknownFields() {
|
|
self.f |= 1 << _F_disable_unknown
|
|
}
|
|
|
|
// CopyString indicates the Decoder to decode string values by copying instead of referring.
|
|
func (self *Decoder) CopyString() {
|
|
self.f |= 1 << _F_copy_string
|
|
}
|
|
|
|
// ValidateString causes the Decoder to validate string values when decoding string value
|
|
// in JSON. Validation is that, returning error when unescaped control chars(0x00-0x1f) or
|
|
// invalid UTF-8 chars in the string value of JSON.
|
|
func (self *Decoder) ValidateString() {
|
|
self.f |= 1 << _F_validate_string
|
|
}
|
|
|
|
// Pretouch compiles vt ahead-of-time to avoid JIT compilation on-the-fly, in
|
|
// order to reduce the first-hit latency.
|
|
//
|
|
// Opts are the compile options, for example, "option.WithCompileRecursiveDepth" is
|
|
// a compile option to set the depth of recursive compile for the nested struct type.
|
|
func Pretouch(vt reflect.Type, opts ...option.CompileOption) error {
|
|
cfg := option.DefaultCompileOptions()
|
|
for _, opt := range opts {
|
|
opt(&cfg)
|
|
}
|
|
return pretouchRec(map[reflect.Type]bool{vt:true}, cfg)
|
|
}
|
|
|
|
func pretouchType(_vt reflect.Type, opts option.CompileOptions) (map[reflect.Type]bool, error) {
|
|
/* compile function */
|
|
compiler := newCompiler().apply(opts)
|
|
decoder := func(vt *rt.GoType, _ ...interface{}) (interface{}, error) {
|
|
if pp, err := compiler.compile(_vt); err != nil {
|
|
return nil, err
|
|
} else {
|
|
as := newAssembler(pp)
|
|
as.name = _vt.String()
|
|
return as.Load(), nil
|
|
}
|
|
}
|
|
|
|
/* find or compile */
|
|
vt := rt.UnpackType(_vt)
|
|
if val := programCache.Get(vt); val != nil {
|
|
return nil, nil
|
|
} else if _, err := programCache.Compute(vt, decoder); err == nil {
|
|
return compiler.rec, nil
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
func pretouchRec(vtm map[reflect.Type]bool, opts option.CompileOptions) error {
|
|
if opts.RecursiveDepth < 0 || len(vtm) == 0 {
|
|
return nil
|
|
}
|
|
next := make(map[reflect.Type]bool)
|
|
for vt := range(vtm) {
|
|
sub, err := pretouchType(vt, opts)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for svt := range(sub) {
|
|
next[svt] = true
|
|
}
|
|
}
|
|
opts.RecursiveDepth -= 1
|
|
return pretouchRec(next, opts)
|
|
}
|
|
|
|
// Skip skips only one json value, and returns first non-blank character position and its ending position if it is valid.
|
|
// Otherwise, returns negative error code using start and invalid character position using end
|
|
func Skip(data []byte) (start int, end int) {
|
|
s := rt.Mem2Str(data)
|
|
p := 0
|
|
m := types.NewStateMachine()
|
|
ret := native.SkipOne(&s, &p, m, uint64(0))
|
|
types.FreeStateMachine(m)
|
|
return ret, p
|
|
}
|