mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-25 22:31:35 +00:00
408 lines
9.9 KiB
Go
408 lines
9.9 KiB
Go
package gojay
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
// DecodeObject reads the next JSON-encoded value from the decoder's input (io.Reader) and stores it in the value pointed to by v.
|
|
//
|
|
// v must implement UnmarshalerJSONObject.
|
|
//
|
|
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
|
|
func (dec *Decoder) DecodeObject(j UnmarshalerJSONObject) error {
|
|
if dec.isPooled == 1 {
|
|
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
|
|
}
|
|
_, err := dec.decodeObject(j)
|
|
return err
|
|
}
|
|
func (dec *Decoder) decodeObject(j UnmarshalerJSONObject) (int, error) {
|
|
keys := j.NKeys()
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
switch dec.data[dec.cursor] {
|
|
case ' ', '\n', '\t', '\r', ',':
|
|
case '{':
|
|
dec.cursor = dec.cursor + 1
|
|
// if keys is zero we will parse all keys
|
|
// we run two loops for micro optimization
|
|
if keys == 0 {
|
|
for dec.cursor < dec.length || dec.read() {
|
|
k, done, err := dec.nextKey()
|
|
if err != nil {
|
|
return 0, err
|
|
} else if done {
|
|
return dec.cursor, nil
|
|
}
|
|
err = j.UnmarshalJSONObject(dec, k)
|
|
if err != nil {
|
|
dec.err = err
|
|
return 0, err
|
|
} else if dec.called&1 == 0 {
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
} else {
|
|
dec.keysDone++
|
|
}
|
|
dec.called &= 0
|
|
}
|
|
} else {
|
|
for (dec.cursor < dec.length || dec.read()) && dec.keysDone < keys {
|
|
k, done, err := dec.nextKey()
|
|
if err != nil {
|
|
return 0, err
|
|
} else if done {
|
|
return dec.cursor, nil
|
|
}
|
|
err = j.UnmarshalJSONObject(dec, k)
|
|
if err != nil {
|
|
dec.err = err
|
|
return 0, err
|
|
} else if dec.called&1 == 0 {
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
} else {
|
|
dec.keysDone++
|
|
}
|
|
dec.called &= 0
|
|
}
|
|
}
|
|
// will get to that point when keysDone is not lower than keys anymore
|
|
// in that case, we make sure cursor goes to the end of object, but we skip
|
|
// unmarshalling
|
|
if dec.child&1 != 0 {
|
|
end, err := dec.skipObject()
|
|
dec.cursor = end
|
|
return dec.cursor, err
|
|
}
|
|
return dec.cursor, nil
|
|
case 'n':
|
|
dec.cursor++
|
|
err := dec.assertNull()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return dec.cursor, nil
|
|
default:
|
|
// can't unmarshal to struct
|
|
dec.err = dec.makeInvalidUnmarshalErr(j)
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return dec.cursor, nil
|
|
}
|
|
}
|
|
return 0, dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
|
|
func (dec *Decoder) decodeObjectNull(v interface{}) (int, error) {
|
|
// make sure the value is a pointer
|
|
vv := reflect.ValueOf(v)
|
|
vvt := vv.Type()
|
|
if vvt.Kind() != reflect.Ptr || vvt.Elem().Kind() != reflect.Ptr {
|
|
dec.err = ErrUnmarshalPtrExpected
|
|
return 0, dec.err
|
|
}
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
switch dec.data[dec.cursor] {
|
|
case ' ', '\n', '\t', '\r', ',':
|
|
case '{':
|
|
elt := vv.Elem()
|
|
n := reflect.New(elt.Type().Elem())
|
|
elt.Set(n)
|
|
var j UnmarshalerJSONObject
|
|
var ok bool
|
|
if j, ok = n.Interface().(UnmarshalerJSONObject); !ok {
|
|
dec.err = dec.makeInvalidUnmarshalErr((UnmarshalerJSONObject)(nil))
|
|
return 0, dec.err
|
|
}
|
|
keys := j.NKeys()
|
|
dec.cursor = dec.cursor + 1
|
|
// if keys is zero we will parse all keys
|
|
// we run two loops for micro optimization
|
|
if keys == 0 {
|
|
for dec.cursor < dec.length || dec.read() {
|
|
k, done, err := dec.nextKey()
|
|
if err != nil {
|
|
return 0, err
|
|
} else if done {
|
|
return dec.cursor, nil
|
|
}
|
|
err = j.UnmarshalJSONObject(dec, k)
|
|
if err != nil {
|
|
dec.err = err
|
|
return 0, err
|
|
} else if dec.called&1 == 0 {
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
} else {
|
|
dec.keysDone++
|
|
}
|
|
dec.called &= 0
|
|
}
|
|
} else {
|
|
for (dec.cursor < dec.length || dec.read()) && dec.keysDone < keys {
|
|
k, done, err := dec.nextKey()
|
|
if err != nil {
|
|
return 0, err
|
|
} else if done {
|
|
return dec.cursor, nil
|
|
}
|
|
err = j.UnmarshalJSONObject(dec, k)
|
|
if err != nil {
|
|
dec.err = err
|
|
return 0, err
|
|
} else if dec.called&1 == 0 {
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
} else {
|
|
dec.keysDone++
|
|
}
|
|
dec.called &= 0
|
|
}
|
|
}
|
|
// will get to that point when keysDone is not lower than keys anymore
|
|
// in that case, we make sure cursor goes to the end of object, but we skip
|
|
// unmarshalling
|
|
if dec.child&1 != 0 {
|
|
end, err := dec.skipObject()
|
|
dec.cursor = end
|
|
return dec.cursor, err
|
|
}
|
|
return dec.cursor, nil
|
|
case 'n':
|
|
dec.cursor++
|
|
err := dec.assertNull()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return dec.cursor, nil
|
|
default:
|
|
// can't unmarshal to struct
|
|
dec.err = dec.makeInvalidUnmarshalErr((UnmarshalerJSONObject)(nil))
|
|
err := dec.skipData()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return dec.cursor, nil
|
|
}
|
|
}
|
|
return 0, dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
|
|
func (dec *Decoder) skipObject() (int, error) {
|
|
var objectsOpen = 1
|
|
var objectsClosed = 0
|
|
for j := dec.cursor; j < dec.length || dec.read(); j++ {
|
|
switch dec.data[j] {
|
|
case '}':
|
|
objectsClosed++
|
|
// everything is closed return
|
|
if objectsOpen == objectsClosed {
|
|
// add char to object data
|
|
return j + 1, nil
|
|
}
|
|
case '{':
|
|
objectsOpen++
|
|
case '"':
|
|
j++
|
|
var isInEscapeSeq bool
|
|
var isFirstQuote = true
|
|
for ; j < dec.length || dec.read(); j++ {
|
|
if dec.data[j] != '"' {
|
|
continue
|
|
}
|
|
if dec.data[j-1] != '\\' || (!isInEscapeSeq && !isFirstQuote) {
|
|
break
|
|
} else {
|
|
isInEscapeSeq = false
|
|
}
|
|
if isFirstQuote {
|
|
isFirstQuote = false
|
|
}
|
|
// loop backward and count how many anti slash found
|
|
// to see if string is effectively escaped
|
|
ct := 0
|
|
for i := j - 1; i > 0; i-- {
|
|
if dec.data[i] != '\\' {
|
|
break
|
|
}
|
|
ct++
|
|
}
|
|
// is pair number of slashes, quote is not escaped
|
|
if ct&1 == 0 {
|
|
break
|
|
}
|
|
isInEscapeSeq = true
|
|
}
|
|
default:
|
|
continue
|
|
}
|
|
}
|
|
return 0, dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
|
|
func (dec *Decoder) nextKey() (string, bool, error) {
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
switch dec.data[dec.cursor] {
|
|
case ' ', '\n', '\t', '\r', ',':
|
|
continue
|
|
case '"':
|
|
dec.cursor = dec.cursor + 1
|
|
start, end, err := dec.getString()
|
|
if err != nil {
|
|
return "", false, err
|
|
}
|
|
var found byte
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
if dec.data[dec.cursor] == ':' {
|
|
found |= 1
|
|
break
|
|
}
|
|
}
|
|
if found&1 != 0 {
|
|
dec.cursor++
|
|
d := dec.data[start : end-1]
|
|
return *(*string)(unsafe.Pointer(&d)), false, nil
|
|
}
|
|
return "", false, dec.raiseInvalidJSONErr(dec.cursor)
|
|
case '}':
|
|
dec.cursor = dec.cursor + 1
|
|
return "", true, nil
|
|
default:
|
|
// can't unmarshall to struct
|
|
return "", false, dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
}
|
|
return "", false, dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
|
|
func (dec *Decoder) skipData() error {
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
switch dec.data[dec.cursor] {
|
|
case ' ', '\n', '\t', '\r', ',':
|
|
continue
|
|
// is null
|
|
case 'n':
|
|
dec.cursor++
|
|
err := dec.assertNull()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
case 't':
|
|
dec.cursor++
|
|
err := dec.assertTrue()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
// is false
|
|
case 'f':
|
|
dec.cursor++
|
|
err := dec.assertFalse()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
// is an object
|
|
case '{':
|
|
dec.cursor = dec.cursor + 1
|
|
end, err := dec.skipObject()
|
|
dec.cursor = end
|
|
return err
|
|
// is string
|
|
case '"':
|
|
dec.cursor = dec.cursor + 1
|
|
err := dec.skipString()
|
|
return err
|
|
// is array
|
|
case '[':
|
|
dec.cursor = dec.cursor + 1
|
|
end, err := dec.skipArray()
|
|
dec.cursor = end
|
|
return err
|
|
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-':
|
|
end, err := dec.skipNumber()
|
|
dec.cursor = end
|
|
return err
|
|
}
|
|
return dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
return dec.raiseInvalidJSONErr(dec.cursor)
|
|
}
|
|
|
|
// DecodeObjectFunc is a func type implementing UnmarshalerJSONObject.
|
|
// Use it to cast a `func(*Decoder, k string) error` to Unmarshal an object on the fly.
|
|
type DecodeObjectFunc func(*Decoder, string) error
|
|
|
|
// UnmarshalJSONObject implements UnmarshalerJSONObject.
|
|
func (f DecodeObjectFunc) UnmarshalJSONObject(dec *Decoder, k string) error {
|
|
return f(dec, k)
|
|
}
|
|
|
|
// NKeys implements UnmarshalerJSONObject.
|
|
func (f DecodeObjectFunc) NKeys() int {
|
|
return 0
|
|
}
|
|
|
|
// Add Values functions
|
|
|
|
// AddObject decodes the JSON value within an object or an array to a UnmarshalerJSONObject.
|
|
func (dec *Decoder) AddObject(v UnmarshalerJSONObject) error {
|
|
return dec.Object(v)
|
|
}
|
|
|
|
// AddObjectNull decodes the JSON value within an object or an array to a UnmarshalerJSONObject.
|
|
func (dec *Decoder) AddObjectNull(v interface{}) error {
|
|
return dec.ObjectNull(v)
|
|
}
|
|
|
|
// Object decodes the JSON value within an object or an array to a UnmarshalerJSONObject.
|
|
func (dec *Decoder) Object(value UnmarshalerJSONObject) error {
|
|
initialKeysDone := dec.keysDone
|
|
initialChild := dec.child
|
|
dec.keysDone = 0
|
|
dec.called = 0
|
|
dec.child |= 1
|
|
newCursor, err := dec.decodeObject(value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dec.cursor = newCursor
|
|
dec.keysDone = initialKeysDone
|
|
dec.child = initialChild
|
|
dec.called |= 1
|
|
return nil
|
|
}
|
|
|
|
// ObjectNull decodes the JSON value within an object or an array to a UnmarshalerJSONObject.
|
|
// v should be a pointer to an UnmarshalerJSONObject,
|
|
// if `null` value is encountered in JSON, it will leave the value v untouched,
|
|
// else it will create a new instance of the UnmarshalerJSONObject behind v.
|
|
func (dec *Decoder) ObjectNull(v interface{}) error {
|
|
initialKeysDone := dec.keysDone
|
|
initialChild := dec.child
|
|
dec.keysDone = 0
|
|
dec.called = 0
|
|
dec.child |= 1
|
|
newCursor, err := dec.decodeObjectNull(v)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dec.cursor = newCursor
|
|
dec.keysDone = initialKeysDone
|
|
dec.child = initialChild
|
|
dec.called |= 1
|
|
return nil
|
|
}
|