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tsfm_super.go
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/
tsfm_super.go
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package transformer
import (
"context"
"io"
"reflect"
pkgerr "github.com/pkg/errors"
vldterr "github.com/machinefi/w3bstream/pkg/depends/kit/validator/errors"
"github.com/machinefi/w3bstream/pkg/depends/x/reflectx"
)
func NewSuper(tsfm Transformer, opt *CommonOption) *Super {
return &Super{
tsfm: tsfm,
CommonOption: *opt,
}
}
type Super struct {
tsfm Transformer
CommonOption
}
func (t *Super) EncodeTo(ctx context.Context, w io.Writer, v interface{}) error {
rv, ok := v.(reflect.Value)
if !ok {
rv = reflect.ValueOf(v)
}
if t.Explode {
rv = reflectx.Indirect(rv)
// for create slice
if setter, ok := w.(interface{ SetN(n int) }); ok {
setter.SetN(rv.Len())
}
if next, ok := w.(CanNextWriter); ok {
errs := vldterr.NewErrorSet()
for i := 0; i < rv.Len(); i++ {
nw := next.NextWriter()
if err := t.tsfm.EncodeTo(ctx, nw, rv.Index(i)); err != nil {
errs.AddErr(err, i)
}
}
return errs.Err()
}
return nil
}
// should skip empty value when omitempty
if !(t.Omitempty && reflectx.IsEmptyValue(rv)) {
writer, ok := w.(CanNextWriter)
if ok {
return t.tsfm.EncodeTo(ctx, writer.NextWriter(), rv)
}
return t.tsfm.EncodeTo(ctx, w, rv)
}
return nil
}
func (t *Super) DecodeFrom(ctx context.Context, r io.Reader, v interface{}) error {
if rv, ok := v.(reflect.Value); ok {
v = rv.Interface()
}
if reflect.TypeOf(v).Kind() != reflect.Ptr {
return pkgerr.Errorf("decode target must be ptr value")
}
if t.Explode {
valc := 0
if with, ok := r.(interface{ Len() int }); ok {
valc = with.Len()
}
if valc == 0 {
return nil
}
if x, ok := v.(*[]string); ok {
if with, ok := r.(CanInterface); ok {
if values, ok := with.Interface().([]string); ok {
*x = values
return nil
}
}
}
rv := reflectx.Indirect(reflect.ValueOf(v))
// make slice (ignore array)
if rv.Kind() == reflect.Slice {
rv.Set(reflect.MakeSlice(rv.Type(), valc, valc))
}
reader, ok := r.(CanNextReader)
if !ok {
return nil
}
errs := vldterr.NewErrorSet()
// ignore when values length greater than array len
for i := 0; i < rv.Len() && i < valc; i++ {
if err := t.tsfm.DecodeFrom(
ctx,
reader.NextReader(),
rv.Index(i).Addr(),
); err != nil {
errs.AddErr(err, i)
}
}
return errs.Err()
}
reader, ok := r.(CanNextReader)
if ok {
return t.tsfm.DecodeFrom(ctx, reader.NextReader(), v)
}
return t.tsfm.DecodeFrom(ctx, r, v)
}
type CanNextWriter interface {
NextWriter() io.Writer
}
type CanNextReader interface {
NextReader() io.Reader
}