feat: add option on sonic.Config

api.go

@@ -31,6 +31,7 @@ import (
     UseUnicodeErrors              bool
     DisallowUnknownFields         bool
     CopyString                    bool
+    NoNullSliceOrMap              bool
  }
 
  var (

encode_test.go

@@ -19,13 +19,13 @@
 package sonic
 
 import (
-    `os`
     `bytes`
     `encoding`
     `encoding/json`
     `fmt`
     `log`
     `math`
+    `os`
     `reflect`
     `regexp`
     `runtime`
@@ -36,6 +36,7 @@ import (
     `unsafe`
 
     `github.com/bytedance/sonic/encoder`
+    `github.com/stretchr/testify/assert`
 )
 
 var (
@@ -1153,3 +1154,18 @@ func TestMarshalerError(t *testing.T) {
         }
     }
 }
+
+func TestMarshalNullNil(t *testing.T) {
+    var v = struct {
+        A []int
+        B map[string]int
+    }{}
+    o, e := Marshal(v)
+    assert.Nil(t, e)
+    assert.Equal(t, `{"A":null,"B":null}`, string(o))
+    o, e = Config{
+        NoNullSliceOrMap: true,
+    }.Froze().Marshal(v)
+    assert.Nil(t, e)
+    assert.Equal(t, `{"A":[],"B":{}}`, string(o))
+}

encoder/encoder.go

@@ -63,6 +63,7 @@ const (
     // instead of 'null'
     NoNullSliceOrMap     Options = 1 << bitNoNullSliceOrMap
 
+    // CompatibleWithStd is used to be compatible with std encoder.
     CompatibleWithStd Options = SortMapKeys | EscapeHTML | CompactMarshaler
 )
 

sonic.go

@@ -85,6 +85,9 @@ func (cfg Config) Froze() API {
     if cfg.CopyString {
         api.decoderOpts |= decoder.OptionCopyString
     }
+    if cfg.NoNullSliceOrMap {
+        api.encoderOpts |= encoder.NoNullSliceOrMap
+    }
     return api
 }