fix lint error

cmd/generator/main.go

@@ -15,11 +15,8 @@ type opType struct {
 	Op                    string
 	Code                  string
 	HeadToPtrHead         func() string
-	HeadToNPtrHead        func() string
-	HeadToAnonymousHead   func() string
 	HeadToOmitEmptyHead   func() string
 	HeadToStringTagHead   func() string
-	HeadToOnlyHead        func() string
 	PtrHeadToHead         func() string
 	FieldToEnd            func() string
 	FieldToOmitEmptyField func() string
@@ -30,14 +27,6 @@ func (t opType) IsHeadToPtrHead() bool {
 	return t.Op != t.HeadToPtrHead()
 }
 
-func (t opType) IsHeadToNPtrHead() bool {
-	return t.Op != t.HeadToNPtrHead()
-}
-
-func (t opType) IsHeadToAnonymousHead() bool {
-	return t.Op != t.HeadToAnonymousHead()
-}
-
 func (t opType) IsHeadToOmitEmptyHead() bool {
 	return t.Op != t.HeadToOmitEmptyHead()
 }
@@ -50,10 +39,6 @@ func (t opType) IsPtrHeadToHead() bool {
 	return t.Op != t.PtrHeadToHead()
 }
 
-func (t opType) IsHeadToOnlyHead() bool {
-	return t.Op != t.HeadToOnlyHead()
-}
-
 func (t opType) IsFieldToEnd() bool {
 	return t.Op != t.FieldToEnd()
 }
@@ -71,11 +56,8 @@ func createOpType(op, code string) opType {
 		Op:                    op,
 		Code:                  code,
 		HeadToPtrHead:         func() string { return op },
-		HeadToNPtrHead:        func() string { return op },
-		HeadToAnonymousHead:   func() string { return op },
 		HeadToOmitEmptyHead:   func() string { return op },
 		HeadToStringTagHead:   func() string { return op },
-		HeadToOnlyHead:        func() string { return op },
 		PtrHeadToHead:         func() string { return op },
 		FieldToEnd:            func() string { return op },
 		FieldToOmitEmptyField: func() string { return op },
@@ -127,19 +109,19 @@ func (t opType) codeType() codeType {
     }
     return codeStructField
   }
-  if strings.Contains(t.String(), "ArrayHead") {
+  if t.String() == "Array" || t.String() == "ArrayPtr" {
     return codeArrayHead
   }
   if strings.Contains(t.String(), "ArrayElem") {
     return codeArrayElem
   }
-  if strings.Contains(t.String(), "SliceHead") {
+  if t.String() == "Slice" || t.String() == "SlicePtr" {
     return codeSliceHead
   }
   if strings.Contains(t.String(), "SliceElem") {
     return codeSliceElem
   }
-  if strings.Contains(t.String(), "MapHead") {
+  if t.String() == "Map" || t.String() == "MapPtr" {
     return codeMapHead
   }
   if strings.Contains(t.String(), "MapKey") {
@@ -159,9 +141,6 @@ func (t opType) headToPtrHead() opType {
   if strings.Index(t.String(), "PtrHead") > 0 {
     return t
   }
-  if strings.Index(t.String(), "PtrAnonymousHead") > 0 {
-    return t
-  }
 
   idx := strings.Index(t.String(), "Field")
   if idx == -1 {
@@ -169,44 +148,15 @@ func (t opType) headToPtrHead() opType {
   }
   suffix := "Ptr"+t.String()[idx+len("Field"):]
 
-  const toPtrOffset = 12
+  const toPtrOffset = 3
   if strings.Contains(opType(int(t) + toPtrOffset).String(), suffix) {
     return opType(int(t) + toPtrOffset)
   }
   return t
 }
 
-func (t opType) headToNPtrHead() opType {
-  if strings.Index(t.String(), "PtrHead") > 0 {
-    return t
-  }
-  if strings.Index(t.String(), "PtrAnonymousHead") > 0 {
-    return t
-  }
-
-  idx := strings.Index(t.String(), "Field")
-  if idx == -1 {
-    return t
-  }
-  suffix := "NPtr"+t.String()[idx+len("Field"):]
-
-  const toPtrOffset = 24
-  if strings.Contains(opType(int(t) + toPtrOffset).String(), suffix) {
-    return opType(int(t) + toPtrOffset)
-  }
-  return t
-}
-
-func (t opType) headToAnonymousHead() opType {
-  const toAnonymousOffset = 6
-  if strings.Contains(opType(int(t) + toAnonymousOffset).String(), "Anonymous") {
-    return opType(int(t) + toAnonymousOffset)
-  }
-  return t
-}
-
 func (t opType) headToOmitEmptyHead() opType {
-  const toOmitEmptyOffset = 2
+  const toOmitEmptyOffset = 1
   if strings.Contains(opType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
     return opType(int(t) + toOmitEmptyOffset)
   }
@@ -215,25 +165,13 @@ func (t opType) headToOmitEmptyHead() opType {
 }
 
 func (t opType) headToStringTagHead() opType {
-  const toStringTagOffset = 4
+  const toStringTagOffset = 2
   if strings.Contains(opType(int(t) + toStringTagOffset).String(), "StringTag") {
     return opType(int(t) + toStringTagOffset)
   }
   return t
 }
 
-func (t opType) headToOnlyHead() opType {
-  if strings.HasSuffix(t.String(), "Head") || strings.HasSuffix(t.String(), "HeadOmitEmpty") || strings.HasSuffix(t.String(), "HeadStringTag") {
-    return t
-  }
-
-  const toOnlyOffset = 1
-  if opType(int(t) + toOnlyOffset).String() == t.String() + "Only" {
-    return opType(int(t) + toOnlyOffset)
-  }
-  return t
-}
-
 func (t opType) ptrHeadToHead() opType {
   idx := strings.Index(t.String(), "Ptr")
   if idx == -1 {
@@ -241,7 +179,7 @@ func (t opType) ptrHeadToHead() opType {
   }
   suffix := t.String()[idx+len("Ptr"):]
 
-  const toPtrOffset = 12
+  const toPtrOffset = 3
   if strings.Contains(opType(int(t) - toPtrOffset).String(), suffix) {
     return opType(int(t) - toPtrOffset)
   }
@@ -295,11 +233,11 @@ func (t opType) fieldToStringTagField() opType {
 		"StructEnd",
 	}
 	primitiveTypes := []string{
-		"int", "uint", "float32", "float64", "bool", "string", "bytes",
-		"array", "map", "mapLoad", "slice", "struct", "MarshalJSON", "MarshalText", "recursive",
+		"int", "uint", "float32", "float64", "bool", "string", "bytes", "number",
+		"array", "map", "slice", "struct", "MarshalJSON", "MarshalText", "recursive",
 		"intString", "uintString",
-		"intPtr", "uintPtr", "float32Ptr", "float64Ptr", "boolPtr", "stringPtr", "bytesPtr",
-		"intNPtr", "uintNPtr", "float32NPtr", "float64NPtr", "boolNPtr", "stringNPtr", "bytesNPtr",
+		"intPtr", "uintPtr", "float32Ptr", "float64Ptr", "boolPtr", "stringPtr", "bytesPtr", "numberPtr",
+		"arrayPtr", "mapPtr", "slicePtr", "marshalJSONPtr", "marshalTextPtr", "interfacePtr", "recursivePtr",
 	}
 	primitiveTypesUpper := []string{}
 	for _, typ := range primitiveTypes {
@@ -309,17 +247,12 @@ func (t opType) fieldToStringTagField() opType {
 		createOpType("End", "Op"),
 		createOpType("Interface", "Op"),
 		createOpType("Ptr", "Op"),
-		createOpType("NPtr", "Op"),
-		createOpType("SliceHead", "SliceHead"),
 		createOpType("RootSliceHead", "SliceHead"),
 		createOpType("SliceElem", "SliceElem"),
 		createOpType("RootSliceElem", "SliceElem"),
 		createOpType("SliceEnd", "Op"),
-		createOpType("ArrayHead", "ArrayHead"),
 		createOpType("ArrayElem", "ArrayElem"),
 		createOpType("ArrayEnd", "Op"),
-		createOpType("MapHead", "MapHead"),
-		createOpType("MapHeadLoad", "MapHead"),
 		createOpType("MapKey", "MapKey"),
 		createOpType("MapValue", "MapValue"),
 		createOpType("MapEnd", "Op"),
@@ -331,94 +264,47 @@ func (t opType) fieldToStringTagField() opType {
 		opTypes = append(opTypes, createOpType(typ, "Op"))
 	}
 	for _, typ := range append(primitiveTypesUpper, "") {
-		for _, ptrOrNot := range []string{"", "Ptr", "NPtr"} {
-			for _, headType := range []string{"", "Anonymous"} {
+		for _, ptrOrNot := range []string{"", "Ptr"} {
 			for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
-					for _, onlyOrNot := range []string{"", "Only"} {
 				ptrOrNot := ptrOrNot
-						headType := headType
 				opt := opt
 				typ := typ
-						onlyOrNot := onlyOrNot
 
 				op := fmt.Sprintf(
-							"StructField%s%sHead%s%s%s",
+					"StructField%sHead%s%s",
 					ptrOrNot,
-							headType,
 					opt,
 					typ,
-							onlyOrNot,
 				)
 				opTypes = append(opTypes, opType{
 					Op:   op,
 					Code: "StructField",
 					HeadToPtrHead: func() string {
 						return fmt.Sprintf(
-									"StructFieldPtr%sHead%s%s%s",
-									headType,
+							"StructFieldPtrHead%s%s",
 							opt,
 							typ,
-									onlyOrNot,
-								)
-							},
-							HeadToNPtrHead: func() string {
-								return fmt.Sprintf(
-									"StructFieldNPtr%sHead%s%s%s",
-									headType,
-									opt,
-									typ,
-									onlyOrNot,
-								)
-							},
-							HeadToAnonymousHead: func() string {
-								return fmt.Sprintf(
-									"StructField%sAnonymousHead%s%s%s",
-									ptrOrNot,
-									opt,
-									typ,
-									onlyOrNot,
 						)
 					},
 					HeadToOmitEmptyHead: func() string {
 						return fmt.Sprintf(
-									"StructField%s%sHeadOmitEmpty%s%s",
+							"StructField%sHeadOmitEmpty%s",
 							ptrOrNot,
-									headType,
 							typ,
-									onlyOrNot,
 						)
 					},
 					HeadToStringTagHead: func() string {
 						return fmt.Sprintf(
-									"StructField%s%sHeadStringTag%s%s",
+							"StructField%sHeadStringTag%s",
 							ptrOrNot,
-									headType,
-									typ,
-									onlyOrNot,
-								)
-							},
-							HeadToOnlyHead: func() string {
-								switch typ {
-								case "", "Array", "Map", "MapLoad", "Slice",
-									"Struct", "Recursive", "MarshalJSON", "MarshalText",
-									"IntString", "UintString":
-									return op
-								}
-								return fmt.Sprintf(
-									"StructField%s%sHead%s%sOnly",
-									ptrOrNot,
-									headType,
-									opt,
 							typ,
 						)
 					},
 					PtrHeadToHead: func() string {
 						return fmt.Sprintf(
-									"StructField%sHead%s%s%s",
-									headType,
+							"StructFieldHead%s%s",
 							opt,
 							typ,
-									onlyOrNot,
 						)
 					},
 					FieldToEnd:            func() string { return op },
@@ -428,8 +314,6 @@ func (t opType) fieldToStringTagField() opType {
 			}
 		}
 	}
-		}
-	}
 	for _, typ := range append(primitiveTypesUpper, "") {
 		for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
 			opt := opt
@@ -444,15 +328,12 @@ func (t opType) fieldToStringTagField() opType {
 				Op:                  op,
 				Code:                "StructField",
 				HeadToPtrHead:       func() string { return op },
-				HeadToNPtrHead:      func() string { return op },
-				HeadToAnonymousHead: func() string { return op },
 				HeadToOmitEmptyHead: func() string { return op },
 				HeadToStringTagHead: func() string { return op },
-				HeadToOnlyHead:      func() string { return op },
 				PtrHeadToHead:       func() string { return op },
 				FieldToEnd: func() string {
 					switch typ {
-					case "", "Array", "Map", "MapLoad", "Slice", "Struct", "Recursive":
+					case "", "Array", "Map", "Slice", "Struct", "Recursive":
 						return op
 					}
 					return fmt.Sprintf(
@@ -490,11 +371,8 @@ func (t opType) fieldToStringTagField() opType {
 				Op:                    op,
 				Code:                  "StructEnd",
 				HeadToPtrHead:         func() string { return op },
-				HeadToNPtrHead:        func() string { return op },
-				HeadToAnonymousHead:   func() string { return op },
 				HeadToOmitEmptyHead:   func() string { return op },
 				HeadToStringTagHead:   func() string { return op },
-				HeadToOnlyHead:        func() string { return op },
 				PtrHeadToHead:         func() string { return op },
 				FieldToEnd:            func() string { return op },
 				FieldToOmitEmptyField: func() string { return op },

compact.go

@@ -5,6 +5,9 @@ import (
 )
 
 func compact(dst *bytes.Buffer, src []byte, escape bool) error {
+	if len(src) == 0 {
+		return errUnexpectedEndOfJSON("", 0)
+	}
 	length := len(src)
 	for cursor := 0; cursor < length; cursor++ {
 		c := src[cursor]

cover_bool_test.go

@@ -1774,11 +1774,11 @@ func TestCoverBool(t *testing.T) {
 					enc.SetIndent("", "  ")
 				}
 				if err := enc.Encode(test.data); err != nil {
-					t.Fatalf("%s(htmlEscape:%T): %+v: %s", test.name, htmlEscape, test.data, err)
+					t.Fatalf("%s(htmlEscape:%v,indent:%v): %+v: %s", test.name, htmlEscape, indent, test.data, err)
 				}
 				stdresult := encodeByEncodingJSON(test.data, indent, htmlEscape)
 				if buf.String() != stdresult {
-					t.Errorf("%s(htmlEscape:%T): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, stdresult, buf.String())
+					t.Errorf("%s(htmlEscape:%v,indent:%v): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, indent, stdresult, buf.String())
 				}
 			}
 		}

cover_helper_test.go

@@ -19,6 +19,9 @@ func float32ptr(v float32) *float32 { return &v }
 func float64ptr(v float64) *float64           { return &v }
 func stringptr(v string) *string              { return &v }
 func boolptr(v bool) *bool                    { return &v }
+func sliceptr(v []int) *[]int                 { return &v }
+func arrayptr(v [2]int) *[2]int               { return &v }
+func mapptr(v map[string]int) *map[string]int { return &v }
 
 func encodeByEncodingJSON(data interface{}, indent, escape bool) string {
 	var buf bytes.Buffer

cover_int16_test.go

@@ -408,6 +408,29 @@ func TestCoverInt16(t *testing.T) {
 			}{A: nil, B: nil},
 		},
 
+		// PtrHeadInt16NilMultiFields
+		{
+			name: "PtrHeadInt16NilMultiFields",
+			data: (*struct {
+				A int16 `json:"a"`
+				B int16 `json:"b"`
+			})(nil),
+		},
+		{
+			name: "PtrHeadInt16NilMultiFieldsOmitEmpty",
+			data: (*struct {
+				A int16 `json:"a,omitempty"`
+				B int16 `json:"b,omitempty"`
+			})(nil),
+		},
+		{
+			name: "PtrHeadInt16NilMultiFieldsString",
+			data: (*struct {
+				A int16 `json:"a,string"`
+				B int16 `json:"b,string"`
+			})(nil),
+		},
+
 		// PtrHeadInt16NilMultiFields
 		{
 			name: "PtrHeadInt16NilMultiFields",

cover_int_test.go

@@ -1774,11 +1774,11 @@ func TestCoverInt(t *testing.T) {
 					enc.SetIndent("", "  ")
 				}
 				if err := enc.Encode(test.data); err != nil {
-					t.Fatalf("%s(htmlEscape:%T): %+v: %s", test.name, htmlEscape, test.data, err)
+					t.Fatalf("%s(htmlEscape:%v,indent:%v): %+v: %s", test.name, htmlEscape, indent, test.data, err)
 				}
 				stdresult := encodeByEncodingJSON(test.data, indent, htmlEscape)
 				if buf.String() != stdresult {
-					t.Errorf("%s(htmlEscape:%T): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, stdresult, buf.String())
+					t.Errorf("%s(htmlEscape:%v,indent:%v): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, indent, stdresult, buf.String())
 				}
 			}
 		}

cover_string_test.go

@@ -1793,11 +1793,11 @@ func TestCoverString(t *testing.T) {
 					enc.SetIndent("", "  ")
 				}
 				if err := enc.Encode(test.data); err != nil {
-					t.Fatalf("%s(htmlEscape:%T): %v: %s", test.name, htmlEscape, test.data, err)
+					t.Fatalf("%s(htmlEscape:%v,indent:%v): %v: %s", test.name, htmlEscape, indent, test.data, err)
 				}
 				stdresult := encodeByEncodingJSON(test.data, indent, htmlEscape)
 				if buf.String() != stdresult {
-					t.Errorf("%s(htmlEscape:%T): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, stdresult, buf.String())
+					t.Errorf("%s(htmlEscape:%v,indent:%v): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, indent, stdresult, buf.String())
 				}
 			}
 		}

cover_uint16_test.go

@@ -1774,11 +1774,11 @@ func TestCoverUint16(t *testing.T) {
 					enc.SetIndent("", "  ")
 				}
 				if err := enc.Encode(test.data); err != nil {
-					t.Fatalf("%s(htmlEscape:%T): %+v: %s", test.name, htmlEscape, test.data, err)
+					t.Fatalf("%s(htmlEscape:%v,indent:%v): %+v: %s", test.name, htmlEscape, indent, test.data, err)
 				}
 				stdresult := encodeByEncodingJSON(test.data, indent, htmlEscape)
 				if buf.String() != stdresult {
-					t.Errorf("%s(htmlEscape:%T): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, stdresult, buf.String())
+					t.Errorf("%s(htmlEscape:%v,indent:%v): doesn't compatible with encoding/json. expected %q but got %q", test.name, htmlEscape, indent, stdresult, buf.String())
 				}
 			}
 		}

decode_compile.go

@@ -80,7 +80,7 @@ func decodeCompile(typ *rtype, structName, fieldName string, structTypeToDecoder
 	case reflect.Uint64:
 		return decodeCompileUint64(typ, structName, fieldName)
 	case reflect.String:
-		return decodeCompileString(structName, fieldName)
+		return decodeCompileString(typ, structName, fieldName)
 	case reflect.Bool:
 		return decodeCompileBool(structName, fieldName)
 	case reflect.Float32:
@@ -203,7 +203,12 @@ func decodeCompileFloat64(structName, fieldName string) (decoder, error) {
 	}), nil
 }
 
-func decodeCompileString(structName, fieldName string) (decoder, error) {
+func decodeCompileString(typ *rtype, structName, fieldName string) (decoder, error) {
+	if typ == type2rtype(jsonNumberType) {
+		return newNumberDecoder(structName, fieldName, func(p unsafe.Pointer, v Number) {
+			*(*Number)(p) = v
+		}), nil
+	}
 	return newStringDecoder(structName, fieldName), nil
 }
 

decode_number.go

@@ -1,11 +1,12 @@
 package json
 
 import (
+	"strconv"
 	"unsafe"
 )
 
 type numberDecoder struct {
-	*floatDecoder
+	stringDecoder *stringDecoder
 	op            func(unsafe.Pointer, Number)
 	structName    string
 	fieldName     string
@@ -13,7 +14,7 @@ type numberDecoder struct {
 
 func newNumberDecoder(structName, fieldName string, op func(unsafe.Pointer, Number)) *numberDecoder {
 	return &numberDecoder{
-		floatDecoder: newFloatDecoder(structName, fieldName, nil),
+		stringDecoder: newStringDecoder(structName, fieldName),
 		op:            op,
 		structName:    structName,
 		fieldName:     fieldName,
@@ -21,22 +22,97 @@ func newNumberDecoder(structName, fieldName string, op func(unsafe.Pointer, Numb
 }
 
 func (d *numberDecoder) decodeStream(s *stream, depth int64, p unsafe.Pointer) error {
-	bytes, err := d.floatDecoder.decodeStreamByte(s)
+	bytes, err := d.decodeStreamByte(s)
 	if err != nil {
 		return err
 	}
+	if _, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&bytes)), 64); err != nil {
+		return &SyntaxError{msg: err.Error(), Offset: s.totalOffset()}
+	}
 	d.op(p, Number(string(bytes)))
 	s.reset()
 	return nil
 }
 
 func (d *numberDecoder) decode(buf []byte, cursor, depth int64, p unsafe.Pointer) (int64, error) {
-	bytes, c, err := d.floatDecoder.decodeByte(buf, cursor)
+	bytes, c, err := d.decodeByte(buf, cursor)
 	if err != nil {
 		return 0, err
 	}
+	if _, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&bytes)), 64); err != nil {
+		return 0, &SyntaxError{msg: err.Error(), Offset: c}
+	}
 	cursor = c
 	s := *(*string)(unsafe.Pointer(&bytes))
 	d.op(p, Number(s))
 	return cursor, nil
 }
+
+func (d *numberDecoder) decodeStreamByte(s *stream) ([]byte, error) {
+	for {
+		switch s.char() {
+		case ' ', '\n', '\t', '\r':
+			s.cursor++
+			continue
+		case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			return floatBytes(s), nil
+		case 'n':
+			if err := nullBytes(s); err != nil {
+				return nil, err
+			}
+			return nil, nil
+		case '"':
+			return d.stringDecoder.decodeStreamByte(s)
+		case nul:
+			if s.read() {
+				continue
+			}
+			goto ERROR
+		default:
+			goto ERROR
+		}
+	}
+ERROR:
+	return nil, errUnexpectedEndOfJSON("json.Number", s.totalOffset())
+}
+
+func (d *numberDecoder) decodeByte(buf []byte, cursor int64) ([]byte, int64, error) {
+	buflen := int64(len(buf))
+	for ; cursor < buflen; cursor++ {
+		switch buf[cursor] {
+		case ' ', '\n', '\t', '\r':
+			continue
+		case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			start := cursor
+			cursor++
+			for ; cursor < buflen; cursor++ {
+				if floatTable[buf[cursor]] {
+					continue
+				}
+				break
+			}
+			num := buf[start:cursor]
+			return num, cursor, nil
+		case 'n':
+			if cursor+3 >= buflen {
+				return nil, 0, errUnexpectedEndOfJSON("null", cursor)
+			}
+			if buf[cursor+1] != 'u' {
+				return nil, 0, errInvalidCharacter(buf[cursor+1], "null", cursor)
+			}
+			if buf[cursor+2] != 'l' {
+				return nil, 0, errInvalidCharacter(buf[cursor+2], "null", cursor)
+			}
+			if buf[cursor+3] != 'l' {
+				return nil, 0, errInvalidCharacter(buf[cursor+3], "null", cursor)
+			}
+			cursor += 4
+			return nil, cursor, nil
+		case '"':
+			return d.stringDecoder.decodeByte(buf, cursor)
+		default:
+			return nil, 0, errUnexpectedEndOfJSON("json.Number", cursor)
+		}
+	}
+	return nil, 0, errUnexpectedEndOfJSON("json.Number", cursor)
+}

decode_test.go

@@ -1251,31 +1251,31 @@ var unmarshalTests = []unmarshalTest{
 		in:  `invalid`, // 143
 		ptr: new(json.Number),
 		err: json.NewSyntaxError(
-			`json: invalid character v as null`,
+			`json: json.Number unexpected end of JSON input`,
 			1,
 		),
 	},
 	{
 		in:  `"invalid"`, // 144
 		ptr: new(json.Number),
-		err: fmt.Errorf(`strconv.ParseFloat: parsing "\"invalid\"": invalid syntax`),
+		err: fmt.Errorf(`strconv.ParseFloat: parsing "invalid": invalid syntax`),
 	},
 	{
 		in:  `{"A":"invalid"}`, // 145
 		ptr: new(struct{ A json.Number }),
-		err: fmt.Errorf(`strconv.ParseFloat: parsing "\"invalid\"": invalid syntax`),
+		err: fmt.Errorf(`strconv.ParseFloat: parsing "invalid": invalid syntax`),
 	},
 	{
 		in: `{"A":"invalid"}`, // 146
 		ptr: new(struct {
 			A json.Number `json:",string"`
 		}),
-		err: fmt.Errorf(`json: null unexpected end of JSON input`),
+		err: fmt.Errorf(`json: json.Number unexpected end of JSON input`),
 	},
 	{
 		in:  `{"A":"invalid"}`, // 147
 		ptr: new(map[string]json.Number),
-		err: fmt.Errorf(`strconv.ParseFloat: parsing "\"invalid\"": invalid syntax`),
+		err: fmt.Errorf(`strconv.ParseFloat: parsing "invalid": invalid syntax`),
 	},
 	/*
 		// invalid UTF-8 is coerced to valid UTF-8.
@@ -1836,6 +1836,7 @@ func TestUnmarshal(t *testing.T) {
 
 		// Check round trip also decodes correctly.
 		if tt.err == nil {
+			//fmt.Println("iface = ", v.Interface(), v.Type())
 			enc, err := json.Marshal(v.Interface())
 			if err != nil {
 				t.Errorf("#%d: error re-marshaling: %v", i, err)

encode.go

@@ -2,10 +2,14 @@ package json
 
 import (
 	"bytes"
+	"encoding"
 	"encoding/base64"
+	"fmt"
 	"io"
 	"math"
+	"reflect"
 	"strconv"
+	"strings"
 	"sync"
 	"unsafe"
 )
@@ -358,7 +362,147 @@ func encodeByteSlice(b []byte, src []byte) []byte {
 	return append(append(b, buf...), '"')
 }
 
+func encodeNumber(b []byte, n Number) ([]byte, error) {
+	if len(n) == 0 {
+		return append(b, '0'), nil
+	}
+	for i := 0; i < len(n); i++ {
+		if !floatTable[n[i]] {
+			return nil, fmt.Errorf("json: invalid number literal %q", n)
+		}
+	}
+	b = append(b, n...)
+	return b, nil
+}
+
 func appendIndent(ctx *encodeRuntimeContext, b []byte, indent int) []byte {
 	b = append(b, ctx.prefix...)
 	return append(b, bytes.Repeat(ctx.indentStr, ctx.baseIndent+indent)...)
 }
+
+func encodeIsNilForMarshaler(v interface{}) bool {
+	rv := reflect.ValueOf(v)
+	switch rv.Kind() {
+	case reflect.Interface, reflect.Map, reflect.Ptr:
+		return rv.IsNil()
+	case reflect.Slice:
+		return rv.IsNil() || rv.Len() == 0
+	}
+	return false
+}
+
+func encodeMarshalJSON(code *opcode, b []byte, v interface{}, escape bool) ([]byte, error) {
+	rv := reflect.ValueOf(v) // convert by dynamic interface type
+	if code.addrForMarshaler {
+		if rv.CanAddr() {
+			rv = rv.Addr()
+		} else {
+			newV := reflect.New(rv.Type())
+			newV.Elem().Set(rv)
+			rv = newV
+		}
+	}
+	v = rv.Interface()
+	marshaler, ok := v.(Marshaler)
+	if !ok {
+		return encodeNull(b), nil
+	}
+	bb, err := marshaler.MarshalJSON()
+	if err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	buf := bytes.NewBuffer(b)
+	//TODO: we should validate buffer with `compact`
+	if err := compact(buf, bb, escape); err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	return buf.Bytes(), nil
+}
+
+func encodeMarshalJSONIndent(ctx *encodeRuntimeContext, code *opcode, b []byte, v interface{}, indent int, escape bool) ([]byte, error) {
+	rv := reflect.ValueOf(v) // convert by dynamic interface type
+	if code.addrForMarshaler {
+		if rv.CanAddr() {
+			rv = rv.Addr()
+		} else {
+			newV := reflect.New(rv.Type())
+			newV.Elem().Set(rv)
+			rv = newV
+		}
+	}
+	v = rv.Interface()
+	marshaler, ok := v.(Marshaler)
+	if !ok {
+		return encodeNull(b), nil
+	}
+	bb, err := marshaler.MarshalJSON()
+	if err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	var compactBuf bytes.Buffer
+	if err := compact(&compactBuf, bb, escape); err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	var indentBuf bytes.Buffer
+	if err := encodeWithIndent(
+		&indentBuf,
+		compactBuf.Bytes(),
+		string(ctx.prefix)+strings.Repeat(string(ctx.indentStr), ctx.baseIndent+indent+1),
+		string(ctx.indentStr),
+	); err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	return append(b, indentBuf.Bytes()...), nil
+}
+
+func encodeMarshalText(code *opcode, b []byte, v interface{}, escape bool) ([]byte, error) {
+	rv := reflect.ValueOf(v) // convert by dynamic interface type
+	if code.addrForMarshaler {
+		if rv.CanAddr() {
+			rv = rv.Addr()
+		} else {
+			newV := reflect.New(rv.Type())
+			newV.Elem().Set(rv)
+			rv = newV
+		}
+	}
+	v = rv.Interface()
+	marshaler, ok := v.(encoding.TextMarshaler)
+	if !ok {
+		return encodeNull(b), nil
+	}
+	bytes, err := marshaler.MarshalText()
+	if err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	if escape {
+		return encodeEscapedString(b, *(*string)(unsafe.Pointer(&bytes))), nil
+	}
+	return encodeNoEscapedString(b, *(*string)(unsafe.Pointer(&bytes))), nil
+}
+
+func encodeMarshalTextIndent(code *opcode, b []byte, v interface{}, escape bool) ([]byte, error) {
+	rv := reflect.ValueOf(v) // convert by dynamic interface type
+	if code.addrForMarshaler {
+		if rv.CanAddr() {
+			rv = rv.Addr()
+		} else {
+			newV := reflect.New(rv.Type())
+			newV.Elem().Set(rv)
+			rv = newV
+		}
+	}
+	v = rv.Interface()
+	marshaler, ok := v.(encoding.TextMarshaler)
+	if !ok {
+		return encodeNull(b), nil
+	}
+	bytes, err := marshaler.MarshalText()
+	if err != nil {
+		return nil, &MarshalerError{Type: reflect.TypeOf(v), Err: err}
+	}
+	if escape {
+		return encodeEscapedString(b, *(*string)(unsafe.Pointer(&bytes))), nil
+	}
+	return encodeNoEscapedString(b, *(*string)(unsafe.Pointer(&bytes))), nil
+}

encode_compile.go

@@ -24,6 +24,7 @@ type opcodeSet struct {
 var (
 	marshalJSONType = reflect.TypeOf((*Marshaler)(nil)).Elem()
 	marshalTextType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
+	jsonNumberType  = reflect.TypeOf(Number(""))
 )
 
 func encodeCompileToGetCodeSetSlowPath(typeptr uintptr) (*opcodeSet, error) {
@@ -56,42 +57,44 @@ func encodeCompileToGetCodeSetSlowPath(typeptr uintptr) (*opcodeSet, error) {
 func encodeCompileHead(ctx *encodeCompileContext) (*opcode, error) {
 	typ := ctx.typ
 	switch {
-	case typ.Implements(marshalJSONType):
+	case encodeImplementsMarshalJSON(typ):
 		return encodeCompileMarshalJSON(ctx)
-	case rtype_ptrTo(typ).Implements(marshalJSONType):
-		return encodeCompileMarshalJSONPtr(ctx)
-	case typ.Implements(marshalTextType):
+	case encodeImplementsMarshalText(typ):
 		return encodeCompileMarshalText(ctx)
-	case rtype_ptrTo(typ).Implements(marshalTextType):
-		return encodeCompileMarshalTextPtr(ctx)
 	}
+
 	isPtr := false
 	orgType := typ
 	if typ.Kind() == reflect.Ptr {
 		typ = typ.Elem()
 		isPtr = true
 	}
+	switch {
+	case encodeImplementsMarshalJSON(typ):
+		return encodeCompileMarshalJSON(ctx)
+	case encodeImplementsMarshalText(typ):
+		return encodeCompileMarshalText(ctx)
+	}
 	if typ.Kind() == reflect.Map {
-		return encodeCompileMap(ctx.withType(typ), isPtr)
+		if isPtr {
+			return encodeCompilePtr(ctx.withType(rtype_ptrTo(typ)))
+		}
+		return encodeCompileMap(ctx.withType(typ))
 	} else if typ.Kind() == reflect.Struct {
 		code, err := encodeCompileStruct(ctx.withType(typ), isPtr)
 		if err != nil {
 			return nil, err
 		}
-		encodeConvertHeadOnlyCode(code, isPtr)
 		encodeOptimizeStructEnd(code)
 		encodeLinkRecursiveCode(code)
 		return code, nil
 	} else if isPtr && typ.Implements(marshalTextType) {
 		typ = orgType
-	} else if isPtr && typ.Implements(marshalJSONType) {
-		typ = orgType
 	}
-	code, err := encodeCompile(ctx.withType(typ))
+	code, err := encodeCompile(ctx.withType(typ), isPtr)
 	if err != nil {
 		return nil, err
 	}
-	encodeConvertHeadOnlyCode(code, isPtr)
 	encodeOptimizeStructEnd(code)
 	encodeLinkRecursiveCode(code)
 	return code, nil
@@ -100,9 +103,7 @@ func encodeCompileHead(ctx *encodeCompileContext) (*opcode, error) {
 func encodeLinkRecursiveCode(c *opcode) {
 	for code := c; code.op != opEnd && code.op != opStructFieldRecursiveEnd; {
 		switch code.op {
-		case opStructFieldRecursive,
-			opStructFieldPtrAnonymousHeadRecursive,
-			opStructFieldAnonymousHeadRecursive:
+		case opStructFieldRecursive, opStructFieldRecursivePtr:
 			if code.jmp.linked {
 				code = code.next
 				continue
@@ -143,7 +144,7 @@ func encodeLinkRecursiveCode(c *opcode) {
 
 func encodeOptimizeStructEnd(c *opcode) {
 	for code := c; code.op != opEnd; {
-		if code.op == opStructFieldRecursive {
+		if code.op == opStructFieldRecursive || code.op == opStructFieldRecursivePtr {
 			// ignore if exists recursive operation
 			return
 		}
@@ -163,7 +164,13 @@ func encodeOptimizeStructEnd(c *opcode) {
 			switch code.op {
 			case opStructEnd:
 				prev := code.prevField
-				if strings.Contains(prev.op.String(), "Head") {
+				prevOp := prev.op.String()
+				if strings.Contains(prevOp, "Head") ||
+					strings.Contains(prevOp, "Slice") ||
+					strings.Contains(prevOp, "Array") ||
+					strings.Contains(prevOp, "Map") ||
+					strings.Contains(prevOp, "MarshalJSON") ||
+					strings.Contains(prevOp, "MarshalText") {
 					// not exists field
 					code = code.next
 					break
@@ -182,96 +189,62 @@ func encodeOptimizeStructEnd(c *opcode) {
 	}
 }
 
-func encodeConvertHeadOnlyCode(c *opcode, isPtrHead bool) {
-	if c.nextField == nil {
-		return
+func encodeImplementsMarshalJSON(typ *rtype) bool {
+	if !typ.Implements(marshalJSONType) {
+		return false
 	}
-	if c.nextField.op.codeType() != codeStructEnd {
-		return
-	}
-	switch c.op {
-	case opStructFieldHead:
-		encodeConvertHeadOnlyCode(c.next, false)
-		if !strings.Contains(c.next.op.String(), "Only") {
-			return
-		}
-		c.op = opStructFieldHeadOnly
-	case opStructFieldHeadOmitEmpty:
-		encodeConvertHeadOnlyCode(c.next, false)
-		if !strings.Contains(c.next.op.String(), "Only") {
-			return
-		}
-		c.op = opStructFieldHeadOmitEmptyOnly
-	case opStructFieldHeadStringTag:
-		encodeConvertHeadOnlyCode(c.next, false)
-		if !strings.Contains(c.next.op.String(), "Only") {
-			return
-		}
-		c.op = opStructFieldHeadStringTagOnly
-	case opStructFieldPtrHead:
-	}
-
-	if strings.Contains(c.op.String(), "Marshal") {
-		return
-	}
-	if strings.Contains(c.op.String(), "Slice") {
-		return
-	}
-	if strings.Contains(c.op.String(), "Map") {
-		return
-	}
-
-	isPtrOp := strings.Contains(c.op.String(), "Ptr")
-	if isPtrOp && !isPtrHead {
-		c.op = c.op.headToOnlyHead()
-	} else if !isPtrOp && isPtrHead {
-		c.op = c.op.headToPtrHead().headToOnlyHead()
-	} else if isPtrOp && isPtrHead {
-		c.op = c.op.headToPtrHead().headToOnlyHead()
-	}
-}
-
-func encodeImplementsMarshaler(typ *rtype) bool {
-	switch {
-	case typ.Implements(marshalJSONType):
-		return true
-	case rtype_ptrTo(typ).Implements(marshalJSONType):
-		return true
-	case typ.Implements(marshalTextType):
-		return true
-	case rtype_ptrTo(typ).Implements(marshalTextType):
+	if typ.Kind() != reflect.Ptr {
 		return true
 	}
+	// type kind is reflect.Ptr
+	if !typ.Elem().Implements(marshalJSONType) {
+		return true
+	}
+	// needs to dereference
 	return false
 }
 
-func encodeCompile(ctx *encodeCompileContext) (*opcode, error) {
+func encodeImplementsMarshalText(typ *rtype) bool {
+	if !typ.Implements(marshalTextType) {
+		return false
+	}
+	if typ.Kind() != reflect.Ptr {
+		return true
+	}
+	// type kind is reflect.Ptr
+	if !typ.Elem().Implements(marshalTextType) {
+		return true
+	}
+	// needs to dereference
+	return false
+}
+
+func encodeCompile(ctx *encodeCompileContext, isPtr bool) (*opcode, error) {
 	typ := ctx.typ
 	switch {
-	case typ.Implements(marshalJSONType):
+	case encodeImplementsMarshalJSON(typ):
 		return encodeCompileMarshalJSON(ctx)
-	case rtype_ptrTo(typ).Implements(marshalJSONType):
-		return encodeCompileMarshalJSONPtr(ctx)
-	case typ.Implements(marshalTextType):
+	case encodeImplementsMarshalText(typ):
 		return encodeCompileMarshalText(ctx)
-	case rtype_ptrTo(typ).Implements(marshalTextType):
-		return encodeCompileMarshalTextPtr(ctx)
 	}
 	switch typ.Kind() {
 	case reflect.Ptr:
 		return encodeCompilePtr(ctx)
 	case reflect.Slice:
 		elem := typ.Elem()
-		if !encodeImplementsMarshaler(elem) && elem.Kind() == reflect.Uint8 {
+		if elem.Kind() == reflect.Uint8 {
+			p := rtype_ptrTo(elem)
+			if !p.Implements(marshalJSONType) && !p.Implements(marshalTextType) {
 				return encodeCompileBytes(ctx)
 			}
+		}
 		return encodeCompileSlice(ctx)
 	case reflect.Array:
 		return encodeCompileArray(ctx)
 	case reflect.Map:
-		return encodeCompileMap(ctx, true)
+		return encodeCompileMap(ctx)
 	case reflect.Struct:
-		return encodeCompileStruct(ctx, false)
+		return encodeCompileStruct(ctx, isPtr)
 	case reflect.Interface:
 		return encodeCompileInterface(ctx)
 	case reflect.Int:
@@ -308,13 +281,51 @@ func encodeCompile(ctx *encodeCompileContext) (*opcode, error) {
 	return nil, &UnsupportedTypeError{Type: rtype2type(typ)}
 }
 
+func encodeConvertPtrOp(code *opcode) opType {
+	ptrHeadOp := code.op.headToPtrHead()
+	if code.op != ptrHeadOp {
+		return ptrHeadOp
+	}
+	switch code.op {
+	case opInt:
+		return opIntPtr
+	case opUint:
+		return opUintPtr
+	case opFloat32:
+		return opFloat32Ptr
+	case opFloat64:
+		return opFloat64Ptr
+	case opString:
+		return opStringPtr
+	case opBool:
+		return opBoolPtr
+	case opBytes:
+		return opBytesPtr
+	case opArray:
+		return opArrayPtr
+	case opSlice:
+		return opSlicePtr
+	case opMap:
+		return opMapPtr
+	case opMarshalJSON:
+		return opMarshalJSONPtr
+	case opMarshalText:
+		return opMarshalTextPtr
+	case opInterface:
+		return opInterfacePtr
+	case opStructFieldRecursive:
+		return opStructFieldRecursivePtr
+	}
+	return code.op
+}
+
 func encodeCompileKey(ctx *encodeCompileContext) (*opcode, error) {
 	typ := ctx.typ
 	switch {
-	case rtype_ptrTo(typ).Implements(marshalJSONType):
-		return encodeCompileMarshalJSONPtr(ctx)
-	case rtype_ptrTo(typ).Implements(marshalTextType):
-		return encodeCompileMarshalTextPtr(ctx)
+	case encodeImplementsMarshalJSON(typ):
+		return encodeCompileMarshalJSON(ctx)
+	case encodeImplementsMarshalText(typ):
+		return encodeCompileMarshalText(ctx)
 	}
 	switch typ.Kind() {
 	case reflect.Ptr:
@@ -350,46 +361,31 @@ func encodeCompileKey(ctx *encodeCompileContext) (*opcode, error) {
 }
 
 func encodeCompilePtr(ctx *encodeCompileContext) (*opcode, error) {
-	ptrOpcodeIndex := ctx.opcodeIndex
-	ptrIndex := ctx.ptrIndex
-	ctx.incIndex()
-	code, err := encodeCompile(ctx.withType(ctx.typ.Elem()))
+	code, err := encodeCompile(ctx.withType(ctx.typ.Elem()), true)
 	if err != nil {
 		return nil, err
 	}
-	ptrHeadOp := code.op.headToPtrHead()
-	if code.op != ptrHeadOp {
-		code.op = ptrHeadOp
-		code.decOpcodeIndex()
-		ctx.decIndex()
+	code.op = encodeConvertPtrOp(code)
+	code.ptrNum++
 	return code, nil
 }
-	c := ctx.context()
-	c.opcodeIndex = ptrOpcodeIndex
-	c.ptrIndex = ptrIndex
-	return newOpCodeWithNext(c, opPtr, code), nil
-}
 
 func encodeCompileMarshalJSON(ctx *encodeCompileContext) (*opcode, error) {
 	code := newOpCode(ctx, opMarshalJSON)
-	ctx.incIndex()
-	return code, nil
+	typ := ctx.typ
+	if !typ.Implements(marshalJSONType) && rtype_ptrTo(typ).Implements(marshalJSONType) {
+		code.addrForMarshaler = true
 	}
-
-func encodeCompileMarshalJSONPtr(ctx *encodeCompileContext) (*opcode, error) {
-	code := newOpCode(ctx.withType(rtype_ptrTo(ctx.typ)), opMarshalJSON)
 	ctx.incIndex()
 	return code, nil
 }
 
 func encodeCompileMarshalText(ctx *encodeCompileContext) (*opcode, error) {
 	code := newOpCode(ctx, opMarshalText)
-	ctx.incIndex()
-	return code, nil
+	typ := ctx.typ
+	if !typ.Implements(marshalTextType) && rtype_ptrTo(typ).Implements(marshalTextType) {
+		code.addrForMarshaler = true
 	}
-
-func encodeCompileMarshalTextPtr(ctx *encodeCompileContext) (*opcode, error) {
-	code := newOpCode(ctx.withType(rtype_ptrTo(ctx.typ)), opMarshalText)
 	ctx.incIndex()
 	return code, nil
 }
@@ -593,7 +589,13 @@ func encodeCompileFloat64(ctx *encodeCompileContext) (*opcode, error) {
 }
 
 func encodeCompileString(ctx *encodeCompileContext) (*opcode, error) {
-	code := newOpCode(ctx, opString)
+	var op opType
+	if ctx.typ == type2rtype(jsonNumberType) {
+		op = opNumber
+	} else {
+		op = opString
+	}
+	code := newOpCode(ctx, op)
 	ctx.incIndex()
 	return code, nil
 }
@@ -624,7 +626,7 @@ func encodeCompileSlice(ctx *encodeCompileContext) (*opcode, error) {
 	header := newSliceHeaderCode(ctx)
 	ctx.incIndex()
 
-	code, err := encodeCompile(ctx.withType(ctx.typ.Elem()).incIndent())
+	code, err := encodeCompileSliceElem(ctx.withType(elem).incIndent())
 	if err != nil {
 		return nil, err
 	}
@@ -648,6 +650,18 @@ func encodeCompileSlice(ctx *encodeCompileContext) (*opcode, error) {
 	return (*opcode)(unsafe.Pointer(header)), nil
 }
 
+func encodeCompileSliceElem(ctx *encodeCompileContext) (*opcode, error) {
+	typ := ctx.typ
+	switch {
+	case !typ.Implements(marshalJSONType) && rtype_ptrTo(typ).Implements(marshalJSONType):
+		return encodeCompileMarshalJSON(ctx)
+	case !typ.Implements(marshalTextType) && rtype_ptrTo(typ).Implements(marshalTextType):
+		return encodeCompileMarshalText(ctx)
+	default:
+		return encodeCompile(ctx, false)
+	}
+}
+
 func encodeCompileArray(ctx *encodeCompileContext) (*opcode, error) {
 	ctx.root = false
 	typ := ctx.typ
@@ -658,7 +672,7 @@ func encodeCompileArray(ctx *encodeCompileContext) (*opcode, error) {
 	header := newArrayHeaderCode(ctx, alen)
 	ctx.incIndex()
 
-	code, err := encodeCompile(ctx.withType(elem).incIndent())
+	code, err := encodeCompile(ctx.withType(elem).incIndent(), false)
 	if err != nil {
 		return nil, err
 	}
@@ -697,12 +711,12 @@ func mapiternext(it unsafe.Pointer)
 //go:noescape
 func maplen(m unsafe.Pointer) int
 
-func encodeCompileMap(ctx *encodeCompileContext, withLoad bool) (*opcode, error) {
+func encodeCompileMap(ctx *encodeCompileContext) (*opcode, error) {
 	// header => code => value => code => key => code => value => code => end
 	//                                     ^                       |
 	//                                     |_______________________|
 	ctx = ctx.incIndent()
-	header := newMapHeaderCode(ctx, withLoad)
+	header := newMapHeaderCode(ctx)
 	ctx.incIndex()
 
 	typ := ctx.typ
@@ -716,7 +730,7 @@ func encodeCompileMap(ctx *encodeCompileContext, withLoad bool) (*opcode, error)
 	ctx.incIndex()
 
 	valueType := typ.Elem()
-	valueCode, err := encodeCompile(ctx.withType(valueType))
+	valueCode, err := encodeCompile(ctx.withType(valueType), false)
 	if err != nil {
 		return nil, err
 	}
@@ -745,174 +759,122 @@ func encodeCompileMap(ctx *encodeCompileContext, withLoad bool) (*opcode, error)
 	return (*opcode)(unsafe.Pointer(header)), nil
 }
 
-func encodeTypeToHeaderType(ctx *encodeCompileContext, code *opcode) opType {
+func encodeTypeToHeaderType(code *opcode) opType {
 	switch code.op {
-	case opPtr:
-		ptrNum := 1
-		c := code
-		ctx.decIndex()
-		for {
-			if code.next.op == opPtr {
-				ptrNum++
-				code = code.next
-				ctx.decIndex()
-				continue
-			}
-			break
-		}
-		c.ptrNum = ptrNum
-		if ptrNum > 1 {
-			switch code.next.op {
-			case opInt:
-				c.mask = code.next.mask
-				c.rshiftNum = code.next.rshiftNum
-				return opStructFieldHeadIntNPtr
-			case opUint:
-				c.mask = code.next.mask
-				return opStructFieldHeadUintNPtr
-			case opFloat32:
-				return opStructFieldHeadFloat32NPtr
-			case opFloat64:
-				return opStructFieldHeadFloat64NPtr
-			case opString:
-				return opStructFieldHeadStringNPtr
-			case opBool:
-				return opStructFieldHeadBoolNPtr
-			}
-		} else {
-			switch code.next.op {
-			case opInt:
-				c.mask = code.next.mask
-				c.rshiftNum = code.next.rshiftNum
-				return opStructFieldHeadIntPtr
-			case opUint:
-				c.mask = code.next.mask
-				return opStructFieldHeadUintPtr
-			case opFloat32:
-				return opStructFieldHeadFloat32Ptr
-			case opFloat64:
-				return opStructFieldHeadFloat64Ptr
-			case opString:
-				return opStructFieldHeadStringPtr
-			case opBool:
-				return opStructFieldHeadBoolPtr
-			}
-		}
 	case opInt:
 		return opStructFieldHeadInt
+	case opIntPtr:
+		return opStructFieldHeadIntPtr
 	case opUint:
 		return opStructFieldHeadUint
+	case opUintPtr:
+		return opStructFieldHeadUintPtr
 	case opFloat32:
 		return opStructFieldHeadFloat32
+	case opFloat32Ptr:
+		return opStructFieldHeadFloat32Ptr
 	case opFloat64:
 		return opStructFieldHeadFloat64
+	case opFloat64Ptr:
+		return opStructFieldHeadFloat64Ptr
 	case opString:
 		return opStructFieldHeadString
+	case opStringPtr:
+		return opStructFieldHeadStringPtr
+	case opNumber:
+		return opStructFieldHeadNumber
+	case opNumberPtr:
+		return opStructFieldHeadNumberPtr
 	case opBool:
 		return opStructFieldHeadBool
-	case opMapHead:
+	case opBoolPtr:
+		return opStructFieldHeadBoolPtr
+	case opMap:
 		return opStructFieldHeadMap
-	case opMapHeadLoad:
-		return opStructFieldHeadMapLoad
-	case opArrayHead:
+	case opMapPtr:
+		code.op = opMap
+		return opStructFieldHeadMapPtr
+	case opArray:
 		return opStructFieldHeadArray
-	case opSliceHead:
+	case opArrayPtr:
+		code.op = opArray
+		return opStructFieldHeadArrayPtr
+	case opSlice:
 		return opStructFieldHeadSlice
-	case opStructFieldHead:
-		return opStructFieldHeadStruct
+	case opSlicePtr:
+		code.op = opSlice
+		return opStructFieldHeadSlicePtr
 	case opMarshalJSON:
 		return opStructFieldHeadMarshalJSON
+	case opMarshalJSONPtr:
+		return opStructFieldHeadMarshalJSONPtr
 	case opMarshalText:
 		return opStructFieldHeadMarshalText
+	case opMarshalTextPtr:
+		return opStructFieldHeadMarshalTextPtr
 	}
 	return opStructFieldHead
 }
 
-func encodeTypeToFieldType(ctx *encodeCompileContext, code *opcode) opType {
+func encodeTypeToFieldType(code *opcode) opType {
 	switch code.op {
-	case opPtr:
-		ptrNum := 1
-		ctx.decIndex()
-		c := code
-		for {
-			if code.next.op == opPtr {
-				ptrNum++
-				code = code.next
-				ctx.decIndex()
-				continue
-			}
-			break
-		}
-		c.ptrNum = ptrNum
-		if ptrNum > 1 {
-			switch code.next.op {
-			case opInt:
-				c.mask = code.next.mask
-				c.rshiftNum = code.next.rshiftNum
-				return opStructFieldIntNPtr
-			case opUint:
-				c.mask = code.next.mask
-				return opStructFieldUintNPtr
-			case opFloat32:
-				return opStructFieldFloat32NPtr
-			case opFloat64:
-				return opStructFieldFloat64NPtr
-			case opString:
-				return opStructFieldStringNPtr
-			case opBool:
-				return opStructFieldBoolNPtr
-			}
-		} else {
-			switch code.next.op {
-			case opInt:
-				c.mask = code.next.mask
-				c.rshiftNum = code.next.rshiftNum
-				return opStructFieldIntPtr
-			case opUint:
-				c.mask = code.next.mask
-				return opStructFieldUintPtr
-			case opFloat32:
-				return opStructFieldFloat32Ptr
-			case opFloat64:
-				return opStructFieldFloat64Ptr
-			case opString:
-				return opStructFieldStringPtr
-			case opBool:
-				return opStructFieldBoolPtr
-			}
-		}
 	case opInt:
 		return opStructFieldInt
+	case opIntPtr:
+		return opStructFieldIntPtr
 	case opUint:
 		return opStructFieldUint
+	case opUintPtr:
+		return opStructFieldUintPtr
 	case opFloat32:
 		return opStructFieldFloat32
+	case opFloat32Ptr:
+		return opStructFieldFloat32Ptr
 	case opFloat64:
 		return opStructFieldFloat64
+	case opFloat64Ptr:
+		return opStructFieldFloat64Ptr
 	case opString:
 		return opStructFieldString
+	case opStringPtr:
+		return opStructFieldStringPtr
+	case opNumber:
+		return opStructFieldNumber
+	case opNumberPtr:
+		return opStructFieldNumberPtr
 	case opBool:
 		return opStructFieldBool
-	case opMapHead:
+	case opBoolPtr:
+		return opStructFieldBoolPtr
+	case opMap:
 		return opStructFieldMap
-	case opMapHeadLoad:
-		return opStructFieldMapLoad
-	case opArrayHead:
+	case opMapPtr:
+		code.op = opMap
+		return opStructFieldMapPtr
+	case opArray:
 		return opStructFieldArray
-	case opSliceHead:
+	case opArrayPtr:
+		code.op = opArray
+		return opStructFieldArrayPtr
+	case opSlice:
 		return opStructFieldSlice
-	case opStructFieldHead:
-		return opStructFieldStruct
+	case opSlicePtr:
+		code.op = opSlice
+		return opStructFieldSlicePtr
 	case opMarshalJSON:
 		return opStructFieldMarshalJSON
+	case opMarshalJSONPtr:
+		return opStructFieldMarshalJSONPtr
 	case opMarshalText:
 		return opStructFieldMarshalText
+	case opMarshalTextPtr:
+		return opStructFieldMarshalTextPtr
 	}
 	return opStructField
 }
 
-func encodeOptimizeStructHeader(ctx *encodeCompileContext, code *opcode, tag *structTag) opType {
-	headType := encodeTypeToHeaderType(ctx, code)
+func encodeOptimizeStructHeader(code *opcode, tag *structTag) opType {
+	headType := encodeTypeToHeaderType(code)
 	switch {
 	case tag.isOmitEmpty:
 		headType = headType.headToOmitEmptyHead()
@@ -922,8 +884,8 @@ func encodeOptimizeStructHeader(ctx *encodeCompileContext, code *opcode, tag *st
 	return headType
 }
 
-func encodeOptimizeStructField(ctx *encodeCompileContext, code *opcode, tag *structTag) opType {
-	fieldType := encodeTypeToFieldType(ctx, code)
+func encodeOptimizeStructField(code *opcode, tag *structTag) opType {
+	fieldType := encodeTypeToFieldType(code)
 	switch {
 	case tag.isOmitEmpty:
 		fieldType = fieldType.fieldToOmitEmptyField()
@@ -950,7 +912,7 @@ func encodeCompiledCode(ctx *encodeCompileContext) *opcode {
 
 func encodeStructHeader(ctx *encodeCompileContext, fieldCode *opcode, valueCode *opcode, tag *structTag) *opcode {
 	fieldCode.indent--
-	op := encodeOptimizeStructHeader(ctx, valueCode, tag)
+	op := encodeOptimizeStructHeader(valueCode, tag)
 	fieldCode.op = op
 	fieldCode.mask = valueCode.mask
 	fieldCode.rshiftNum = valueCode.rshiftNum
@@ -960,16 +922,35 @@ func encodeStructHeader(ctx *encodeCompileContext, fieldCode *opcode, valueCode
 		opStructFieldHeadSlice,
 		opStructFieldHeadArray,
 		opStructFieldHeadMap,
-		opStructFieldHeadMapLoad,
 		opStructFieldHeadStruct,
 		opStructFieldHeadOmitEmpty,
 		opStructFieldHeadOmitEmptySlice,
+		opStructFieldHeadStringTagSlice,
 		opStructFieldHeadOmitEmptyArray,
+		opStructFieldHeadStringTagArray,
 		opStructFieldHeadOmitEmptyMap,
-		opStructFieldHeadOmitEmptyMapLoad,
+		opStructFieldHeadStringTagMap,
 		opStructFieldHeadOmitEmptyStruct,
 		opStructFieldHeadStringTag:
 		return valueCode.beforeLastCode()
+	case opStructFieldHeadSlicePtr,
+		opStructFieldHeadOmitEmptySlicePtr,
+		opStructFieldHeadStringTagSlicePtr,
+		opStructFieldHeadArrayPtr,
+		opStructFieldHeadOmitEmptyArrayPtr,
+		opStructFieldHeadStringTagArrayPtr,
+		opStructFieldHeadMapPtr,
+		opStructFieldHeadOmitEmptyMapPtr,
+		opStructFieldHeadStringTagMapPtr:
+		return valueCode.beforeLastCode()
+	case opStructFieldHeadMarshalJSONPtr,
+		opStructFieldHeadOmitEmptyMarshalJSONPtr,
+		opStructFieldHeadStringTagMarshalJSONPtr,
+		opStructFieldHeadMarshalTextPtr,
+		opStructFieldHeadOmitEmptyMarshalTextPtr,
+		opStructFieldHeadStringTagMarshalTextPtr:
+		ctx.decOpcodeIndex()
+		return (*opcode)(unsafe.Pointer(fieldCode))
 	}
 	ctx.decOpcodeIndex()
 	return (*opcode)(unsafe.Pointer(fieldCode))
@@ -977,26 +958,38 @@ func encodeStructHeader(ctx *encodeCompileContext, fieldCode *opcode, valueCode
 
 func encodeStructField(ctx *encodeCompileContext, fieldCode *opcode, valueCode *opcode, tag *structTag) *opcode {
 	code := (*opcode)(unsafe.Pointer(fieldCode))
-	op := encodeOptimizeStructField(ctx, valueCode, tag)
+	op := encodeOptimizeStructField(valueCode, tag)
 	fieldCode.op = op
 	fieldCode.ptrNum = valueCode.ptrNum
 	fieldCode.mask = valueCode.mask
 	fieldCode.rshiftNum = valueCode.rshiftNum
+	fieldCode.jmp = valueCode.jmp
 	switch op {
 	case opStructField,
 		opStructFieldSlice,
 		opStructFieldArray,
 		opStructFieldMap,
-		opStructFieldMapLoad,
 		opStructFieldStruct,
 		opStructFieldOmitEmpty,
 		opStructFieldOmitEmptySlice,
+		opStructFieldStringTagSlice,
 		opStructFieldOmitEmptyArray,
+		opStructFieldStringTagArray,
 		opStructFieldOmitEmptyMap,
-		opStructFieldOmitEmptyMapLoad,
+		opStructFieldStringTagMap,
 		opStructFieldOmitEmptyStruct,
 		opStructFieldStringTag:
 		return valueCode.beforeLastCode()
+	case opStructFieldSlicePtr,
+		opStructFieldOmitEmptySlicePtr,
+		opStructFieldStringTagSlicePtr,
+		opStructFieldArrayPtr,
+		opStructFieldOmitEmptyArrayPtr,
+		opStructFieldStringTagArrayPtr,
+		opStructFieldMapPtr,
+		opStructFieldOmitEmptyMapPtr,
+		opStructFieldStringTagMapPtr:
+		return valueCode.beforeLastCode()
 	}
 	ctx.decIndex()
 	return code
@@ -1006,7 +999,10 @@ func encodeIsNotExistsField(head *opcode) bool {
 	if head == nil {
 		return false
 	}
-	if head.op != opStructFieldAnonymousHead {
+	if head.op != opStructFieldHead {
+		return false
+	}
+	if !head.anonymousHead {
 		return false
 	}
 	if head.next == nil {
@@ -1068,14 +1064,17 @@ func encodeAnonymousStructFieldPairMap(tags structTags, named string, valueCode
 	removedFields := map[*opcode]struct{}{}
 	for {
 		existsKey := tags.existsKey(f.displayKey)
-		op := f.op.headToAnonymousHead()
-		if existsKey && (f.next.op == opStructFieldPtrAnonymousHeadRecursive || f.next.op == opStructFieldAnonymousHeadRecursive) {
+		isHeadOp := strings.Contains(f.op.String(), "Head")
+		if existsKey && strings.Contains(f.op.String(), "Recursive") {
 			// through
-		} else if op != f.op {
+		} else if isHeadOp && !f.anonymousHead {
 			if existsKey {
-				f.op = opStructFieldAnonymousHead
+				// TODO: need to remove this head
+				f.op = opStructFieldHead
+				f.anonymousKey = true
+				f.anonymousHead = true
 			} else if named == "" {
-				f.op = op
+				f.anonymousHead = true
 			}
 		} else if named == "" && f.op == opStructEnd {
 			f.op = opStructAnonymousEnd
@@ -1121,7 +1120,7 @@ func encodeAnonymousFieldPairRecursively(named string, valueCode *opcode) map[st
 	f := valueCode
 	var prevAnonymousField *opcode
 	for {
-		if f.displayKey != "" && strings.Contains(f.op.String(), "Anonymous") {
+		if f.displayKey != "" && f.anonymousHead {
 			key := fmt.Sprintf("%s.%s", named, f.displayKey)
 			anonymousFields[key] = append(anonymousFields[key], structFieldPair{
 				prevField:   prevAnonymousField,
@@ -1158,7 +1157,9 @@ func encodeOptimizeConflictAnonymousFields(anonymousFields map[string][]structFi
 				if !fieldPair.linked {
 					if fieldPair.prevField == nil {
 						// head operation
-						fieldPair.curField.op = opStructFieldAnonymousHead
+						fieldPair.curField.op = opStructFieldHead
+						fieldPair.curField.anonymousHead = true
+						fieldPair.curField.anonymousKey = true
 					} else {
 						diff := fieldPair.curField.nextField.displayIdx - fieldPair.curField.displayIdx
 						for i := 0; i < diff; i++ {
@@ -1176,7 +1177,9 @@ func encodeOptimizeConflictAnonymousFields(anonymousFields map[string][]structFi
 				if !fieldPair.linked {
 					if fieldPair.prevField == nil {
 						// head operation
-						fieldPair.curField.op = opStructFieldAnonymousHead
+						fieldPair.curField.op = opStructFieldHead
+						fieldPair.curField.anonymousHead = true
+						fieldPair.curField.anonymousKey = true
 					} else {
 						diff := fieldPair.curField.nextField.displayIdx - fieldPair.curField.displayIdx
 						removedFields[fieldPair.curField] = struct{}{}
@@ -1209,7 +1212,10 @@ func encodeCompileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode, error)
 	//                        ^          |
 	//                        |__________|
 	fieldNum := typ.NumField()
+	indirect := ifaceIndir(typ)
+	//fmt.Println("indirect = ", indirect, "type = ", typ, "isPtr = ", isPtr)
 	fieldIdx := 0
+	disableIndirectConversion := false
 	var (
 		head      *opcode
 		code      *opcode
@@ -1228,30 +1234,66 @@ func encodeCompileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode, error)
 	for i, tag := range tags {
 		field := tag.field
 		fieldType := type2rtype(field.Type)
-		if isPtr && i == 0 {
-			// head field of pointer structure at top level
-			// if field type is pointer and implements MarshalJSON or MarshalText,
-			// it need to operation of dereference of pointer.
-			if field.Type.Kind() == reflect.Ptr &&
-				(field.Type.Implements(marshalJSONType) || field.Type.Implements(marshalTextType)) {
-				fieldType = rtype_ptrTo(fieldType)
-			}
-		}
 		fieldOpcodeIndex := ctx.opcodeIndex
 		fieldPtrIndex := ctx.ptrIndex
 		ctx.incIndex()
-		valueCode, err := encodeCompile(ctx.withType(fieldType))
+		nilcheck := true
+		var valueCode *opcode
+		isNilValue := fieldType.Kind() == reflect.Ptr || fieldType.Kind() == reflect.Interface || fieldType.Kind() == reflect.Slice || fieldType.Kind() == reflect.Map
+		addrForMarshaler := false
+		if i == 0 && fieldNum == 1 && isPtr && !isNilValue && rtype_ptrTo(fieldType).Implements(marshalJSONType) && !fieldType.Implements(marshalJSONType) {
+			// *struct{ field T } => struct { field *T }
+			// func (*T) MarshalJSON() ([]byte, error)
+			// move pointer position from head to first field
+			code, err := encodeCompileMarshalJSON(ctx.withType(rtype_ptrTo(fieldType)))
 			if err != nil {
 				return nil, err
 			}
+			valueCode = code
+			nilcheck = false
+			indirect = false
+			disableIndirectConversion = true
+		} else if i == 0 && fieldNum == 1 && isPtr && !isNilValue && rtype_ptrTo(fieldType).Implements(marshalTextType) && !fieldType.Implements(marshalTextType) {
+			// *struct{ field T } => struct { field *T }
+			// func (*T) MarshalText() ([]byte, error)
+			// move pointer position from head to first field
+			code, err := encodeCompileMarshalText(ctx.withType(rtype_ptrTo(fieldType)))
+			if err != nil {
+				return nil, err
+			}
+			valueCode = code
+			nilcheck = false
+			indirect = false
+			disableIndirectConversion = true
+		} else if isPtr && !fieldType.Implements(marshalJSONType) && rtype_ptrTo(fieldType).Implements(marshalJSONType) {
+			// *struct{ field T }
+			// func (*T) MarshalJSON() ([]byte, error)
+			code, err := encodeCompileMarshalJSON(ctx.withType(fieldType))
+			if err != nil {
+				return nil, err
+			}
+			addrForMarshaler = true
+			nilcheck = false
+			valueCode = code
+		} else if isPtr && !fieldType.Implements(marshalTextType) && rtype_ptrTo(fieldType).Implements(marshalTextType) {
+			// *struct{ field T }
+			// func (*T) MarshalText() ([]byte, error)
+			code, err := encodeCompileMarshalText(ctx.withType(fieldType))
+			if err != nil {
+				return nil, err
+			}
+			addrForMarshaler = true
+			nilcheck = false
+			valueCode = code
+		} else {
+			code, err := encodeCompile(ctx.withType(fieldType), isPtr)
+			if err != nil {
+				return nil, err
+			}
+			valueCode = code
+		}
 
 		if field.Anonymous {
-			if valueCode.op == opPtr && valueCode.next.op == opStructFieldRecursive {
-				valueCode = valueCode.next
-				valueCode.decOpcodeIndex()
-				ctx.decIndex()
-				valueCode.op = opStructFieldPtrHeadRecursive
-			}
 			tagKey := ""
 			if tag.isTaggedKey {
 				tagKey = tag.key
@@ -1259,6 +1301,14 @@ func encodeCompileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode, error)
 			for k, v := range encodeAnonymousStructFieldPairMap(tags, tagKey, valueCode) {
 				anonymousFields[k] = append(anonymousFields[k], v...)
 			}
+			valueCode.decIndent()
+
+			// fix issue144
+			if !(isPtr && strings.Contains(valueCode.op.String(), "Marshal")) {
+				valueCode.indirect = indirect
+			}
+		} else {
+			valueCode.indirect = indirect
 		}
 		key := fmt.Sprintf(`"%s":`, tag.key)
 		escapedKey := fmt.Sprintf(`%s:`, string(encodeEscapedString([]byte{}, tag.key)))
@@ -1274,6 +1324,9 @@ func encodeCompileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode, error)
 			isTaggedKey:      tag.isTaggedKey,
 			displayKey:       tag.key,
 			offset:           field.Offset,
+			indirect:         indirect,
+			nilcheck:         nilcheck,
+			addrForMarshaler: addrForMarshaler,
 		}
 		if fieldIdx == 0 {
 			fieldCode.headIdx = fieldCode.idx
@@ -1333,5 +1386,9 @@ func encodeCompileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode, error)
 
 	delete(ctx.structTypeToCompiledCode, typeptr)
 
+	if !disableIndirectConversion && !head.indirect && isPtr {
+		head.indirect = true
+	}
+
 	return ret, nil
 }

encode_opcode.go

@@ -18,7 +18,11 @@ type opcode struct {
 	displayKey       string // key text to display
 	isTaggedKey      bool   // whether tagged key
 	anonymousKey     bool   // whether anonymous key
+	anonymousHead    bool   // whether anonymous head or not
 	root             bool   // whether root
+	indirect         bool   // whether indirect or not
+	nilcheck         bool   // whether needs to nilcheck or not
+	addrForMarshaler bool   // whether needs to addr for marshaler or not
 	rshiftNum        uint8  // use to take bit for judging whether negative integer or not
 	mask             uint64 // mask for number
 	indent           int    // indent number
@@ -90,7 +94,11 @@ func (c *opcode) copy(codeMap map[uintptr]*opcode) *opcode {
 		rshiftNum:        c.rshiftNum,
 		isTaggedKey:      c.isTaggedKey,
 		anonymousKey:     c.anonymousKey,
+		anonymousHead:    c.anonymousHead,
 		root:             c.root,
+		indirect:         c.indirect,
+		nilcheck:         c.nilcheck,
+		addrForMarshaler: c.addrForMarshaler,
 		indent:           c.indent,
 		idx:              c.idx,
 		headIdx:          c.headIdx,
@@ -172,6 +180,18 @@ func (c *opcode) decOpcodeIndex() {
 	}
 }
 
+func (c *opcode) decIndent() {
+	for code := c; code.op != opEnd; {
+		code.indent--
+		switch code.op.codeType() {
+		case codeArrayElem, codeSliceElem, codeMapKey:
+			code = code.end
+		default:
+			code = code.next
+		}
+	}
+}
+
 func (c *opcode) dumpHead(code *opcode) string {
 	var length uintptr
 	if code.op.codeType() == codeArrayHead {
@@ -360,7 +380,7 @@ func newSliceHeaderCode(ctx *encodeCompileContext) *opcode {
 	ctx.incPtrIndex()
 	length := opcodeOffset(ctx.ptrIndex)
 	return &opcode{
-		op:         opSliceHead,
+		op:         opSlice,
 		displayIdx: ctx.opcodeIndex,
 		idx:        idx,
 		headIdx:    idx,
@@ -388,7 +408,7 @@ func newArrayHeaderCode(ctx *encodeCompileContext, alen int) *opcode {
 	ctx.incPtrIndex()
 	elemIdx := opcodeOffset(ctx.ptrIndex)
 	return &opcode{
-		op:         opArrayHead,
+		op:         opArray,
 		displayIdx: ctx.opcodeIndex,
 		idx:        idx,
 		headIdx:    idx,
@@ -406,17 +426,12 @@ func newArrayElemCode(ctx *encodeCompileContext, head *opcode, length int, size
 		elemIdx:    head.elemIdx,
 		headIdx:    head.headIdx,
 		length:     uintptr(length),
+		indent:     ctx.indent,
 		size:       size,
 	}
 }
 
-func newMapHeaderCode(ctx *encodeCompileContext, withLoad bool) *opcode {
-	var op opType
-	if withLoad {
-		op = opMapHeadLoad
-	} else {
-		op = opMapHead
-	}
+func newMapHeaderCode(ctx *encodeCompileContext) *opcode {
 	idx := opcodeOffset(ctx.ptrIndex)
 	ctx.incPtrIndex()
 	elemIdx := opcodeOffset(ctx.ptrIndex)
@@ -425,7 +440,7 @@ func newMapHeaderCode(ctx *encodeCompileContext, withLoad bool) *opcode {
 	ctx.incPtrIndex()
 	mapIter := opcodeOffset(ctx.ptrIndex)
 	return &opcode{
-		op:         op,
+		op:         opMap,
 		typ:        ctx.typ,
 		displayIdx: ctx.opcodeIndex,
 		idx:        idx,

encode_test.go

@@ -3,6 +3,7 @@ package json_test
 import (
 	"bytes"
 	"encoding"
+	stdjson "encoding/json"
 	"errors"
 	"fmt"
 	"log"
@@ -1674,3 +1675,117 @@ func TestOmitEmpty(t *testing.T) {
 		t.Errorf(" got: %s\nwant: %s\n", got, optionalsExpected)
 	}
 }
+
+type testNullStr string
+
+func (v *testNullStr) MarshalJSON() ([]byte, error) {
+	if *v == "" {
+		return []byte("null"), nil
+	}
+
+	return []byte(*v), nil
+}
+
+func TestIssue147(t *testing.T) {
+	type T struct {
+		Field1 string      `json:"field1"`
+		Field2 testNullStr `json:"field2,omitempty"`
+	}
+	got, err := json.Marshal(T{
+		Field1: "a",
+		Field2: "b",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	expect, _ := stdjson.Marshal(T{
+		Field1: "a",
+		Field2: "b",
+	})
+	if !bytes.Equal(expect, got) {
+		t.Fatalf("expect %q but got %q", string(expect), string(got))
+	}
+}
+
+type testIssue144 struct {
+	name   string
+	number int64
+}
+
+func (v *testIssue144) MarshalJSON() ([]byte, error) {
+	if v.name != "" {
+		return json.Marshal(v.name)
+	}
+	return json.Marshal(v.number)
+}
+
+func TestIssue144(t *testing.T) {
+	type Embeded struct {
+		Field *testIssue144 `json:"field,omitempty"`
+	}
+	type T struct {
+		Embeded
+	}
+	{
+		v := T{
+			Embeded: Embeded{Field: &testIssue144{name: "hoge"}},
+		}
+		got, err := json.Marshal(v)
+		if err != nil {
+			t.Fatal(err)
+		}
+		expect, _ := stdjson.Marshal(v)
+		if !bytes.Equal(expect, got) {
+			t.Fatalf("expect %q but got %q", string(expect), string(got))
+		}
+	}
+	{
+		v := &T{
+			Embeded: Embeded{Field: &testIssue144{name: "hoge"}},
+		}
+		got, err := json.Marshal(v)
+		if err != nil {
+			t.Fatal(err)
+		}
+		expect, _ := stdjson.Marshal(v)
+		if !bytes.Equal(expect, got) {
+			t.Fatalf("expect %q but got %q", string(expect), string(got))
+		}
+	}
+}
+
+func TestIssue118(t *testing.T) {
+	type data struct {
+		Columns []string   `json:"columns"`
+		Rows1   [][]string `json:"rows1"`
+		Rows2   [][]string `json:"rows2"`
+	}
+	v := data{Columns: []string{"1", "2", "3"}}
+	got, err := json.MarshalIndent(v, "", "  ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	expect, _ := stdjson.MarshalIndent(v, "", "  ")
+	if !bytes.Equal(expect, got) {
+		t.Fatalf("expect %q but got %q", string(expect), string(got))
+	}
+}
+
+func TestIssue104(t *testing.T) {
+	type A struct {
+		Field1 string
+		Field2 int
+		Field3 float64
+	}
+	type T struct {
+		Field A
+	}
+	got, err := json.Marshal(T{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	expect, _ := stdjson.Marshal(T{})
+	if !bytes.Equal(expect, got) {
+		t.Fatalf("expect %q but got %q", string(expect), string(got))
+	}
+}

json.go

@@ -2,8 +2,8 @@ package json
 
 import (
 	"bytes"
+	"encoding/json"
 	"errors"
-	"strconv"
 )
 
 // Marshaler is the interface implemented by types that
@@ -281,39 +281,7 @@ func UnmarshalNoEscape(data []byte, v interface{}) error {
 type Token interface{}
 
 // A Number represents a JSON number literal.
-type Number string
-
-// String returns the literal text of the number.
-func (n Number) String() string { return string(n) }
-
-// Float64 returns the number as a float64.
-func (n Number) Float64() (float64, error) {
-	return strconv.ParseFloat(string(n), 64)
-}
-
-// Int64 returns the number as an int64.
-func (n Number) Int64() (int64, error) {
-	return strconv.ParseInt(string(n), 10, 64)
-}
-
-func (n Number) MarshalJSON() ([]byte, error) {
-	if n == "" {
-		return []byte("0"), nil
-	}
-	if _, err := n.Float64(); err != nil {
-		return nil, err
-	}
-	return []byte(n), nil
-}
-
-func (n *Number) UnmarshalJSON(b []byte) error {
-	s := string(b)
-	if _, err := strconv.ParseFloat(s, 64); err != nil {
-		return &SyntaxError{msg: err.Error()}
-	}
-	*n = Number(s)
-	return nil
-}
+type Number = json.Number
 
 // RawMessage is a raw encoded JSON value.
 // It implements Marshaler and Unmarshaler and can

rtype.go

@@ -244,6 +244,10 @@ func (t *rtype) Out(i int) reflect.Type {
 	return rtype_Out(t, i)
 }
 
+//go:linkname ifaceIndir reflect.ifaceIndir
+//go:noescape
+func ifaceIndir(*rtype) bool
+
 //go:linkname rtype2type reflect.toType
 //go:noescape
 func rtype2type(t *rtype) reflect.Type