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parser.go
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parser.go
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package magicjson
import (
"encoding/json"
"fmt"
"reflect"
"strconv"
"strings"
)
func parse(v reflect.Value, marshaller bool) ([]byte, error) {
if !marshaller {
return defaultParser(v)
}
return marshalJSON(v)
}
func marshalJSON(v reflect.Value) ([]byte, error) {
vPtr := reflect.NewAt(v.Elem().Type(), v.UnsafePointer())
results := vPtr.Elem().MethodByName("MarshalJSON").Call([]reflect.Value{})
bytes, _ := results[0].Interface().([]byte)
err, _ := results[1].Interface().(error)
return bytes, err
}
func defaultParser(v reflect.Value) ([]byte, error) {
s := fmt.Sprint(reflect.Indirect(v))
if isBytes(v) {
return parseBytes(v, s)
}
result, err := resolve(v, s)
if err != nil {
return nil, err
}
b, err := json.Marshal(result)
if err != nil {
return nil, err
}
return b, nil
}
func resolve(v reflect.Value, s string) (any, error) {
vKind := v.Kind()
if matchKind(vKind,
reflect.Int,
reflect.Int8,
reflect.Int16,
reflect.Int32,
reflect.Int64) {
return strconv.Atoi(s)
}
if matchKind(vKind,
reflect.Uint,
reflect.Uint8,
reflect.Uint16,
reflect.Uint32,
reflect.Uint64) {
return strconv.ParseUint(s, 10, 64)
}
if matchKind(vKind, reflect.Float32, reflect.Float64) {
return strconv.ParseFloat(s, 64)
}
if matchKind(vKind, reflect.Complex64, reflect.Complex128) {
return strconv.ParseComplex(s, 128)
}
return s, nil
}
func isBytes(v reflect.Value) bool {
return fmt.Sprint(v.Type()) == `[]uint8`
}
func isEmptySlice(v reflect.Value) bool {
return matchKind(v.Kind(), reflect.Slice, reflect.Array) && v.Len() == 0
}
func matchKind(kind reflect.Kind, kinds ...reflect.Kind) bool {
for i := range kinds {
if kind == kinds[i] {
return true
}
}
return false
}
func parseBytes(v reflect.Value, s string) ([]byte, error) {
if v.IsZero() {
return []byte(`null`), nil
}
bytes := make([]byte, 0)
chunks := strings.Split(s[1:len(s)-1], " ")
for i := range chunks {
val, err := strconv.ParseUint(chunks[i], 10, 64)
if err != nil {
return nil, err
}
bytes = append(bytes, uint8(val))
}
return json.Marshal(bytes)
}