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package gojay
import "reflect"
// DecodeArray 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 UnmarshalerJSONArray.
//
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
func (dec *Decoder) DecodeArray(v UnmarshalerJSONArray) error {
if dec.isPooled == 1 {
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
}
_, err := dec.decodeArray(v)
return err
}
func (dec *Decoder) decodeArray(arr UnmarshalerJSONArray) (int, error) {
// remember last array index in case of nested arrays
lastArrayIndex := dec.arrayIndex
dec.arrayIndex = 0
defer func() {
dec.arrayIndex = lastArrayIndex
}()
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
// array is open, char is not space start readings
for dec.nextChar() != 0 {
// closing array
if dec.data[dec.cursor] == ']' {
dec.cursor = dec.cursor + 1
return dec.cursor, nil
}
// calling unmarshall function for each element of the slice
err := arr.UnmarshalJSONArray(dec)
if err != nil {
return 0, err
}
dec.arrayIndex++
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
case 'n':
// is null
dec.cursor++
err := dec.assertNull()
if err != nil {
return 0, err
}
return dec.cursor, nil
case '{', '"', 'f', 't', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
// can't unmarshall to struct
// we skip array and set Error
dec.err = dec.makeInvalidUnmarshalErr(arr)
err := dec.skipData()
if err != nil {
return 0, err
}
return dec.cursor, nil
default:
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) decodeArrayNull(v interface{}) (int, error) {
// remember last array index in case of nested arrays
lastArrayIndex := dec.arrayIndex
dec.arrayIndex = 0
defer func() {
dec.arrayIndex = lastArrayIndex
}()
vv := reflect.ValueOf(v)
vvt := vv.Type()
if vvt.Kind() != reflect.Ptr || vvt.Elem().Kind() != reflect.Ptr {
dec.err = ErrUnmarshalPtrExpected
return 0, dec.err
}
// not an array not an error, but do not know what to do
// do not check syntax
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
// create our new type
elt := vv.Elem()
n := reflect.New(elt.Type().Elem())
var arr UnmarshalerJSONArray
var ok bool
if arr, ok = n.Interface().(UnmarshalerJSONArray); !ok {
dec.err = dec.makeInvalidUnmarshalErr((UnmarshalerJSONArray)(nil))
return 0, dec.err
}
// array is open, char is not space start readings
for dec.nextChar() != 0 {
// closing array
if dec.data[dec.cursor] == ']' {
elt.Set(n)
dec.cursor = dec.cursor + 1
return dec.cursor, nil
}
// calling unmarshall function for each element of the slice
err := arr.UnmarshalJSONArray(dec)
if err != nil {
return 0, err
}
dec.arrayIndex++
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
case 'n':
// is null
dec.cursor++
err := dec.assertNull()
if err != nil {
return 0, err
}
return dec.cursor, nil
case '{', '"', 'f', 't', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
// can't unmarshall to struct
// we skip array and set Error
dec.err = dec.makeInvalidUnmarshalErr((UnmarshalerJSONArray)(nil))
err := dec.skipData()
if err != nil {
return 0, err
}
return dec.cursor, nil
default:
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
}
return 0, dec.raiseInvalidJSONErr(dec.cursor)
}
func (dec *Decoder) skipArray() (int, error) {
var arraysOpen = 1
var arraysClosed = 0
// var stringOpen byte = 0
for j := dec.cursor; j < dec.length || dec.read(); j++ {
switch dec.data[j] {
case ']':
arraysClosed++
// everything is closed return
if arraysOpen == arraysClosed {
// add char to object data
return j + 1, nil
}
case '[':
arraysOpen++
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)
}
// DecodeArrayFunc is a func type implementing UnmarshalerJSONArray.
// Use it to cast a `func(*Decoder) error` to Unmarshal an array on the fly.
type DecodeArrayFunc func(*Decoder) error
// UnmarshalJSONArray implements UnmarshalerJSONArray.
func (f DecodeArrayFunc) UnmarshalJSONArray(dec *Decoder) error {
return f(dec)
}
// IsNil implements UnmarshalerJSONArray.
func (f DecodeArrayFunc) IsNil() bool {
return f == nil
}
// Add Values functions
// AddArray decodes the JSON value within an object or an array to a UnmarshalerJSONArray.
func (dec *Decoder) AddArray(v UnmarshalerJSONArray) error {
return dec.Array(v)
}
// AddArrayNull decodes the JSON value within an object or an array to a UnmarshalerJSONArray.
func (dec *Decoder) AddArrayNull(v interface{}) error {
return dec.ArrayNull(v)
}
// Array decodes the JSON value within an object or an array to a UnmarshalerJSONArray.
func (dec *Decoder) Array(v UnmarshalerJSONArray) error {
newCursor, err := dec.decodeArray(v)
if err != nil {
return err
}
dec.cursor = newCursor
dec.called |= 1
return nil
}
// ArrayNull decodes the JSON value within an object or an array to a UnmarshalerJSONArray.
// v should be a pointer to an UnmarshalerJSONArray,
// if `null` value is encountered in JSON, it will leave the value v untouched,
// else it will create a new instance of the UnmarshalerJSONArray behind v.
func (dec *Decoder) ArrayNull(v interface{}) error {
newCursor, err := dec.decodeArrayNull(v)
if err != nil {
return err
}
dec.cursor = newCursor
dec.called |= 1
return nil
}
// Index returns the index of an array being decoded.
func (dec *Decoder) Index() int {
return dec.arrayIndex
}
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