Merge pull request #81 from goccy/feature/coverage

Add many test codes and distribute `case` operation ( of `switch` ) to some switch statements

.github/workflows/go.yml

@@ -5,7 +5,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        os: [ "ubuntu-latest", "windows-latest", "macos-latest" ]
+        os: [ "ubuntu-latest", "macos-latest", "windows-latest" ]
         go-version: [ "1.13", "1.14", "1.15" ]
     runs-on: ${{ matrix.os }}
     steps:

cmd/generator/main.go

@@ -14,23 +14,18 @@ import (
 type opType struct {
 	Op                    string
 	Code                  string
-	Indent                func() string
-	Escaped               func() 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
 	FieldToStringTagField func() string
 }
 
-func (t opType) IsEscaped() bool {
-	return t.Op != t.Escaped()
-}
-
 func (t opType) IsHeadToPtrHead() bool {
 	return t.Op != t.HeadToPtrHead()
 }
@@ -55,6 +50,10 @@ 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()
 }
@@ -71,13 +70,12 @@ func createOpType(op, code string) opType {
 	return opType{
 		Op:                    op,
 		Code:                  code,
-		Indent:                func() string { return fmt.Sprintf("%sIndent", op) },
-		Escaped:               func() string { return op },
 		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 },
@@ -89,6 +87,10 @@ func _main() error {
 	tmpl, err := template.New("").Parse(`// Code generated by cmd/generator. DO NOT EDIT!
 package json
 
+import (
+  "strings"
+)
+
 type codeType int
 
 const (
@@ -106,12 +108,8 @@ const (
 )
 
 func (t opType) String() string {
-  if int(t) >= {{ .OpLen }} {
-    return t.toNotIndent().String() + "Indent"
-  }
-
   switch t {
-{{- range $type := .OpNotIndentTypes }}
+{{- range $type := .OpTypes }}
   case op{{ $type.Op }}:
     return "{{ $type.Op }}"
 {{- end }}
@@ -120,152 +118,136 @@ func (t opType) String() string {
 }
 
 func (t opType) codeType() codeType {
-  if int(t) >= {{ .OpLen }} {
+  if strings.Contains(t.String(), "Struct") {
-    return t.toNotIndent().codeType()
+    if strings.Contains(t.String(), "End") {
+      return codeStructEnd
+    }
+    return codeStructField
+  }
+  if strings.Contains(t.String(), "ArrayHead") {
+    return codeArrayHead
+  }
+  if strings.Contains(t.String(), "ArrayElem") {
+    return codeArrayElem
+  }
+  if strings.Contains(t.String(), "SliceHead") {
+    return codeSliceHead
+  }
+  if strings.Contains(t.String(), "SliceElem") {
+    return codeSliceElem
+  }
+  if strings.Contains(t.String(), "MapHead") {
+    return codeMapHead
+  }
+  if strings.Contains(t.String(), "MapKey") {
+    return codeMapKey
+  }
+  if strings.Contains(t.String(), "MapValue") {
+    return codeMapValue
+  }
+  if strings.Contains(t.String(), "MapEnd") {
+    return codeMapEnd
   }
 
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-  case op{{ $type.Op }}:
-    return code{{ $type.Code }}
-{{- end }}
-  }
   return codeOp
 }
 
-func (t opType) toNotIndent() opType {
-  if int(t) >= {{ .OpLen }} {
-    return opType(int(t) - {{ .OpLen }})
-  }
-  return t
-}
-
-func (t opType) toIndent() opType {
-  if int(t) >= {{ .OpLen }} {
-    return t
-  }
-  return opType(int(t) + {{ .OpLen }})
-}
-
-func (t opType) toEscaped() opType {
-  if int(t) >= {{ .OpLen }} {
-    return opType(int(t.toNotIndent().toEscaped()) + {{ .OpLen }})
-  }
-
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-{{- if $type.IsEscaped }}
-  case op{{ $type.Op }}:
-    return op{{ call $type.Escaped }}
-{{- end }}
-{{- end }}
-  }
-  return t
-}
-
 func (t opType) headToPtrHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  if strings.Index(t.String(), "PtrHead") > 0 {
-    return opType(int(t.toNotIndent().headToPtrHead()) + {{ .OpLen }})
+    return t
+  }
+  if strings.Index(t.String(), "PtrAnonymousHead") > 0 {
+    return t
   }
 
-  switch t {
+  idx := strings.Index(t.String(), "Field")
-{{- range $type := .OpNotIndentTypes }}
+  if idx == -1 {
-{{- if $type.IsHeadToPtrHead }}
+    return t
-  case op{{ $type.Op }}:
+  }
-    return op{{ call $type.HeadToPtrHead }}
+  suffix := "Ptr"+t.String()[idx+len("Field"):]
-{{- end }}
+
-{{- end }}
+  const toPtrOffset = 12
+  if strings.Contains(opType(int(t) + toPtrOffset).String(), suffix) {
+    return opType(int(t) + toPtrOffset)
   }
   return t
 }
 
 func (t opType) headToNPtrHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  if strings.Index(t.String(), "PtrHead") > 0 {
-    return opType(int(t.toNotIndent().headToNPtrHead()) + {{ .OpLen }})
+    return t
+  }
+  if strings.Index(t.String(), "PtrAnonymousHead") > 0 {
+    return t
   }
 
-  switch t {
+  idx := strings.Index(t.String(), "Field")
-{{- range $type := .OpNotIndentTypes }}
+  if idx == -1 {
-{{- if $type.IsHeadToNPtrHead }}
+    return t
-  case op{{ $type.Op }}:
+  }
-    return op{{ call $type.HeadToNPtrHead }}
+  suffix := "NPtr"+t.String()[idx+len("Field"):]
-{{- end }}
+
-{{- end }}
+  const toPtrOffset = 24
+  if strings.Contains(opType(int(t) + toPtrOffset).String(), suffix) {
+    return opType(int(t) + toPtrOffset)
   }
   return t
 }
 
 func (t opType) headToAnonymousHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  const toAnonymousOffset = 6
-    return opType(int(t.toNotIndent().headToAnonymousHead()) + {{ .OpLen }})
+  if strings.Contains(opType(int(t) + toAnonymousOffset).String(), "Anonymous") {
-  }
+    return opType(int(t) + toAnonymousOffset)
-
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-{{- if $type.IsHeadToAnonymousHead }}
-  case op{{ $type.Op }}:
-    return op{{ call $type.HeadToAnonymousHead }}
-{{- end }}
-{{- end }}
   }
   return t
 }
 
 func (t opType) headToOmitEmptyHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  const toOmitEmptyOffset = 2
-    return opType(int(t.toNotIndent().headToOmitEmptyHead()) + {{ .OpLen }})
+  if strings.Contains(opType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
+    return opType(int(t) + toOmitEmptyOffset)
   }
 
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-{{- if $type.IsHeadToOmitEmptyHead }}
-  case op{{ $type.Op }}:
-    return op{{ call $type.HeadToOmitEmptyHead }}
-{{- end }}
-{{- end }}
-  }
   return t
 }
 
 func (t opType) headToStringTagHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  const toStringTagOffset = 4
-    return opType(int(t.toNotIndent().headToStringTagHead()) + {{ .OpLen }})
+  if strings.Contains(opType(int(t) + toStringTagOffset).String(), "StringTag") {
+    return opType(int(t) + toStringTagOffset)
+  }
+  return t
 }
 
-  switch t {
+func (t opType) headToOnlyHead() opType {
-{{- range $type := .OpNotIndentTypes }}
+  if strings.HasSuffix(t.String(), "Head") || strings.HasSuffix(t.String(), "HeadOmitEmpty") || strings.HasSuffix(t.String(), "HeadStringTag") {
-{{- if $type.IsHeadToStringTagHead }}
+    return t
-  case op{{ $type.Op }}:
+  }
-    return op{{ call $type.HeadToStringTagHead }}
+
-{{- end }}
+  const toOnlyOffset = 1
-{{- end }}
+  if opType(int(t) + toOnlyOffset).String() == t.String() + "Only" {
+    return opType(int(t) + toOnlyOffset)
   }
   return t
 }
 
 func (t opType) ptrHeadToHead() opType {
-  if int(t) >= {{ .OpLen }} {
+  idx := strings.Index(t.String(), "Ptr")
-    return opType(int(t.toNotIndent().ptrHeadToHead()) + {{ .OpLen }})
+  if idx == -1 {
+    return t
   }
+  suffix := t.String()[idx+len("Ptr"):]
 
-  switch t {
+  const toPtrOffset = 12
-{{- range $type := .OpNotIndentTypes }}
+  if strings.Contains(opType(int(t) - toPtrOffset).String(), suffix) {
-{{- if $type.IsPtrHeadToHead }}
+    return opType(int(t) - toPtrOffset)
-  case op{{ $type.Op }}:
-    return op{{ call $type.PtrHeadToHead }}
-{{- end }}
-{{- end }}
   }
   return t
 }
 
 func (t opType) fieldToEnd() opType {
-  if int(t) >= {{ .OpLen }} {
-    return opType(int(t.toNotIndent().fieldToEnd()) + {{ .OpLen }})
-  }
-
   switch t {
-{{- range $type := .OpNotIndentTypes }}
+{{- range $type := .OpTypes }}
 {{- if $type.IsFieldToEnd }}
   case op{{ $type.Op }}:
     return op{{ call $type.FieldToEnd }}
@@ -276,33 +258,17 @@ func (t opType) fieldToEnd() opType {
 }
 
 func (t opType) fieldToOmitEmptyField() opType {
-  if int(t) >= {{ .OpLen }} {
+  const toOmitEmptyOffset = 1
-    return opType(int(t.toNotIndent().fieldToOmitEmptyField()) + {{ .OpLen }})
+  if strings.Contains(opType(int(t) + toOmitEmptyOffset).String(), "OmitEmpty") {
-  }
+    return opType(int(t) + toOmitEmptyOffset)
-
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-{{- if $type.IsFieldToOmitEmptyField }}
-  case op{{ $type.Op }}:
-    return op{{ call $type.FieldToOmitEmptyField }}
-{{- end }}
-{{- end }}
   }
   return t
 }
 
 func (t opType) fieldToStringTagField() opType {
-  if int(t) >= {{ .OpLen }} {
+  const toStringTagOffset = 2
-    return opType(int(t.toNotIndent().fieldToStringTagField()) + {{ .OpLen }})
+  if strings.Contains(opType(int(t) + toStringTagOffset).String(), "StringTag") {
-  }
+    return opType(int(t) + toStringTagOffset)
-
-  switch t {
-{{- range $type := .OpNotIndentTypes }}
-{{- if $type.IsFieldToStringTagField }}
-  case op{{ $type.Op }}:
-    return op{{ call $type.FieldToStringTagField }}
-{{- end }}
-{{- end }}
   }
   return t
 }
@@ -328,16 +294,16 @@ func (t opType) fieldToStringTagField() opType {
 	primitiveTypes := []string{
 		"int", "int8", "int16", "int32", "int64",
 		"uint", "uint8", "uint16", "uint32", "uint64",
-		"float32", "float64", "bool", "string", "escapedString", "bytes",
+		"float32", "float64", "bool", "string", "bytes",
 		"array", "map", "mapLoad", "slice", "struct", "MarshalJSON", "MarshalText", "recursive",
 		"intString", "int8String", "int16String", "int32String", "int64String",
 		"uintString", "uint8String", "uint16String", "uint32String", "uint64String",
 		"intPtr", "int8Ptr", "int16Ptr", "int32Ptr", "int64Ptr",
 		"uintPtr", "uint8Ptr", "uint16Ptr", "uint32Ptr", "uint64Ptr",
-		"float32Ptr", "float64Ptr", "boolPtr", "stringPtr", "escapedStringPtr", "bytesPtr",
+		"float32Ptr", "float64Ptr", "boolPtr", "stringPtr", "bytesPtr",
 		"intNPtr", "int8NPtr", "int16NPtr", "int32NPtr", "int64NPtr",
 		"uintNPtr", "uint8NPtr", "uint16NPtr", "uint32NPtr", "uint64NPtr",
-		"float32NPtr", "float64NPtr", "boolNPtr", "stringNPtr", "escapedStringNPtr", "bytesNPtr",
+		"float32NPtr", "float64NPtr", "boolNPtr", "stringNPtr", "bytesNPtr",
 	}
 	primitiveTypesUpper := []string{}
 	for _, typ := range primitiveTypes {
@@ -367,109 +333,98 @@ func (t opType) fieldToStringTagField() opType {
 	}
 	for _, typ := range primitiveTypesUpper {
 		typ := typ
-		optype := createOpType(typ, "Op")
+		opTypes = append(opTypes, createOpType(typ, "Op"))
-		switch typ {
-		case "String", "StringPtr", "StringNPtr":
-			optype.Escaped = func() string {
-				return fmt.Sprintf("Escaped%s", typ)
 	}
-		}
+	for _, typ := range append(primitiveTypesUpper, "") {
-		opTypes = append(opTypes, optype)
-	}
-	for _, escapedOrNot := range []string{"", "Escaped"} {
 		for _, ptrOrNot := range []string{"", "Ptr", "NPtr"} {
 			for _, headType := range []string{"", "Anonymous"} {
 				for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
-					for _, typ := range append(primitiveTypesUpper, "") {
+					for _, onlyOrNot := range []string{"", "Only"} {
-						escapedOrNot := escapedOrNot
 						ptrOrNot := ptrOrNot
 						headType := headType
 						opt := opt
 						typ := typ
+						onlyOrNot := onlyOrNot
 
 						op := fmt.Sprintf(
-							"Struct%sField%s%sHead%s%s",
+							"StructField%s%sHead%s%s%s",
-							escapedOrNot,
 							ptrOrNot,
 							headType,
 							opt,
 							typ,
+							onlyOrNot,
 						)
 						opTypes = append(opTypes, opType{
 							Op:   op,
 							Code: "StructField",
-							Indent: func() string { return fmt.Sprintf("%sIndent", op) },
-							Escaped: func() string {
-								switch typ {
-								case "String", "StringPtr", "StringNPtr":
-									return fmt.Sprintf(
-										"StructEscapedField%s%sHead%sEscaped%s",
-										ptrOrNot,
-										headType,
-										opt,
-										typ,
-									)
-								}
-								return fmt.Sprintf(
-									"StructEscapedField%s%sHead%s%s",
-									ptrOrNot,
-									headType,
-									opt,
-									typ,
-								)
-							},
 							HeadToPtrHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sFieldPtr%sHead%s%s",
+									"StructFieldPtr%sHead%s%s%s",
-									escapedOrNot,
 									headType,
 									opt,
 									typ,
+									onlyOrNot,
 								)
 							},
 							HeadToNPtrHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sFieldNPtr%sHead%s%s",
+									"StructFieldNPtr%sHead%s%s%s",
-									escapedOrNot,
 									headType,
 									opt,
 									typ,
+									onlyOrNot,
 								)
 							},
 							HeadToAnonymousHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sField%sAnonymousHead%s%s",
+									"StructField%sAnonymousHead%s%s%s",
-									escapedOrNot,
 									ptrOrNot,
 									opt,
 									typ,
+									onlyOrNot,
 								)
 							},
 							HeadToOmitEmptyHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sField%s%sHeadOmitEmpty%s",
+									"StructField%s%sHeadOmitEmpty%s%s",
-									escapedOrNot,
 									ptrOrNot,
 									headType,
 									typ,
+									onlyOrNot,
 								)
 							},
 							HeadToStringTagHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sField%s%sHeadStringTag%s",
+									"StructField%s%sHeadStringTag%s%s",
-									escapedOrNot,
 									ptrOrNot,
 									headType,
 									typ,
+									onlyOrNot,
+								)
+							},
+							HeadToOnlyHead: func() string {
+								switch typ {
+								case "", "Array", "Map", "MapLoad", "Slice",
+									"Struct", "Recursive", "MarshalJSON", "MarshalText",
+									"IntString", "Int8String", "Int16String", "Int32String", "Int64String",
+									"UintString", "Uint8String", "Uint16String", "Uint32String", "Uint64String":
+									return op
+								}
+								return fmt.Sprintf(
+									"StructField%s%sHead%s%sOnly",
+									ptrOrNot,
+									headType,
+									opt,
+									typ,
 								)
 							},
 							PtrHeadToHead: func() string {
 								return fmt.Sprintf(
-									"Struct%sField%sHead%s%s",
+									"StructField%sHead%s%s%s",
-									escapedOrNot,
 									headType,
 									opt,
 									typ,
+									onlyOrNot,
 								)
 							},
 							FieldToEnd:            func() string { return op },
@@ -481,43 +436,25 @@ func (t opType) fieldToStringTagField() opType {
 			}
 		}
 	}
-	for _, escapedOrNot := range []string{"", "Escaped"} {
-		for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
 	for _, typ := range append(primitiveTypesUpper, "") {
-				escapedOrNot := escapedOrNot
+		for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
 			opt := opt
 			typ := typ
 
 			op := fmt.Sprintf(
-					"Struct%sField%s%s",
+				"StructField%s%s",
-					escapedOrNot,
 				opt,
 				typ,
 			)
 			opTypes = append(opTypes, opType{
 				Op:                  op,
 				Code:                "StructField",
-					Indent: func() string { return fmt.Sprintf("%sIndent", op) },
-					Escaped: func() string {
-						switch typ {
-						case "String", "StringPtr", "StringNPtr":
-							return fmt.Sprintf(
-								"StructEscapedField%sEscaped%s",
-								opt,
-								typ,
-							)
-						}
-						return fmt.Sprintf(
-							"StructEscapedField%s%s",
-							opt,
-							typ,
-						)
-					},
 				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 {
@@ -525,67 +462,45 @@ func (t opType) fieldToStringTagField() opType {
 						return op
 					}
 					return fmt.Sprintf(
-							"Struct%sEnd%s%s",
+						"StructEnd%s%s",
-							escapedOrNot,
 						opt,
 						typ,
 					)
 				},
 				FieldToOmitEmptyField: func() string {
 					return fmt.Sprintf(
-							"Struct%sFieldOmitEmpty%s",
+						"StructFieldOmitEmpty%s",
-							escapedOrNot,
 						typ,
 					)
 				},
 				FieldToStringTagField: func() string {
 					return fmt.Sprintf(
-							"Struct%sFieldStringTag%s",
+						"StructFieldStringTag%s",
-							escapedOrNot,
 						typ,
 					)
 				},
 			})
 		}
 	}
-	}
-	for _, escapedOrNot := range []string{"", "Escaped"} {
-		for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
 	for _, typ := range append(primitiveTypesUpper, "") {
-				escapedOrNot := escapedOrNot
+		for _, opt := range []string{"", "OmitEmpty", "StringTag"} {
 			opt := opt
 			typ := typ
 
 			op := fmt.Sprintf(
-					"Struct%sEnd%s%s",
+				"StructEnd%s%s",
-					escapedOrNot,
 				opt,
 				typ,
 			)
 			opTypes = append(opTypes, opType{
 				Op:                    op,
 				Code:                  "StructEnd",
-					Indent: func() string { return fmt.Sprintf("%sIndent", op) },
-					Escaped: func() string {
-						switch typ {
-						case "String", "StringPtr", "StringNPtr":
-							return fmt.Sprintf(
-								"StructEscapedEnd%sEscaped%s",
-								opt,
-								typ,
-							)
-						}
-						return fmt.Sprintf(
-							"StructEscapedEnd%s%s",
-							opt,
-							typ,
-						)
-					},
 				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 },
@@ -593,57 +508,15 @@ func (t opType) fieldToStringTagField() opType {
 			})
 		}
 	}
-	}
-	indentOpTypes := []opType{}
-	for _, typ := range opTypes {
-		typ := typ
-		indentOpTypes = append(indentOpTypes, opType{
-			Op:      fmt.Sprintf("%sIndent", typ.Op),
-			Code:    typ.Code,
-			Indent:  func() string { return fmt.Sprintf("%sIndent", typ.Op) },
-			Escaped: func() string { return fmt.Sprintf("%sIndent", typ.Escaped()) },
-			HeadToPtrHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.HeadToPtrHead())
-			},
-			HeadToNPtrHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.HeadToNPtrHead())
-			},
-			HeadToAnonymousHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.HeadToAnonymousHead())
-			},
-			HeadToOmitEmptyHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.HeadToOmitEmptyHead())
-			},
-			HeadToStringTagHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.HeadToStringTagHead())
-			},
-			PtrHeadToHead: func() string {
-				return fmt.Sprintf("%sIndent", typ.PtrHeadToHead())
-			},
-			FieldToOmitEmptyField: func() string {
-				return fmt.Sprintf("%sIndent", typ.FieldToOmitEmptyField())
-			},
-			FieldToStringTagField: func() string {
-				return fmt.Sprintf("%sIndent", typ.FieldToStringTagField())
-			},
-			FieldToEnd: func() string {
-				return fmt.Sprintf("%sIndent", typ.FieldToEnd())
-			},
-		})
-	}
 	var b bytes.Buffer
 	if err := tmpl.Execute(&b, struct {
 		CodeTypes []string
 		OpTypes   []opType
-		OpNotIndentTypes []opType
 		OpLen     int
-		OpIndentLen      int
 	}{
 		CodeTypes: codeTypes,
-		OpTypes:          append(opTypes, indentOpTypes...),
+		OpTypes:   opTypes,
-		OpNotIndentTypes: opTypes,
 		OpLen:     len(opTypes),
-		OpIndentLen:      len(indentOpTypes),
 	}); err != nil {
 		return err
 	}

encode.go

@@ -42,10 +42,7 @@ const (
 )
 
 type opcodeSet struct {
-	escapedCode       *opcode
-	escapedCodeIndent *opcode
 	code       *opcode
-	codeIndent        *opcode
 	codeLength int
 }
 
@@ -194,24 +191,21 @@ func (e *Encoder) encode(header *interfaceHeader, isNil bool) ([]byte, error) {
 	typeptr := uintptr(unsafe.Pointer(typ))
 	opcodeMap := loadOpcodeMap()
 	if codeSet, exists := opcodeMap[typeptr]; exists {
-		var code *opcode
-		if e.enabledIndent {
-			if e.enabledHTMLEscape {
-				code = codeSet.escapedCodeIndent
-			} else {
-				code = codeSet.codeIndent
-			}
-		} else {
-			if e.enabledHTMLEscape {
-				code = codeSet.escapedCode
-			} else {
-				code = codeSet.code
-			}
-		}
 		ctx := e.ctx
 		p := uintptr(header.ptr)
 		ctx.init(p, codeSet.codeLength)
-		return e.run(ctx, b, code)
+
+		if e.enabledIndent {
+			if e.enabledHTMLEscape {
+				return e.runEscapedIndent(ctx, b, codeSet.code)
+			} else {
+				return e.runIndent(ctx, b, codeSet.code)
+			}
+		}
+		if e.enabledHTMLEscape {
+			return e.runEscaped(ctx, b, codeSet.code)
+		}
+		return e.run(ctx, b, codeSet.code)
 	}
 
 	// noescape trick for header.typ ( reflect.*rtype )
@@ -226,13 +220,9 @@ func (e *Encoder) encode(header *interfaceHeader, isNil bool) ([]byte, error) {
 		return nil, err
 	}
 	code = copyOpcode(code)
-	codeIndent := toIndent(code)
 	codeLength := code.totalLength()
 	codeSet := &opcodeSet{
-		escapedCode:       toEscaped(code),
-		escapedCodeIndent: toEscaped(codeIndent),
 		code:       code,
-		codeIndent:        codeIndent,
 		codeLength: codeLength,
 	}
 
@@ -241,26 +231,17 @@ func (e *Encoder) encode(header *interfaceHeader, isNil bool) ([]byte, error) {
 	ctx := e.ctx
 	ctx.init(p, codeLength)
 
-	var c *opcode
 	if e.enabledIndent {
 		if e.enabledHTMLEscape {
-			c = codeSet.escapedCodeIndent
+			return e.runEscapedIndent(ctx, b, codeSet.code)
 		} else {
-			c = codeSet.codeIndent
+			return e.runIndent(ctx, b, codeSet.code)
+		}
 	}
-	} else {
 	if e.enabledHTMLEscape {
-			c = codeSet.escapedCode
+		return e.runEscaped(ctx, b, codeSet.code)
-		} else {
-			c = codeSet.code
 	}
-	}
+	return e.run(ctx, b, codeSet.code)
-
-	b, err = e.run(ctx, b, c)
-	if err != nil {
-		return nil, err
-	}
-	return b, nil
 }
 
 func encodeFloat32(b []byte, v float32) []byte {

encode_compile.go

@@ -32,6 +32,7 @@ func (e *Encoder) compileHead(ctx *encodeCompileContext) (*opcode, error) {
 		if err != nil {
 			return nil, err
 		}
+		e.convertHeadOnlyCode(code, isPtr)
 		e.optimizeStructEnd(code)
 		return code, nil
 	} else if isPtr && typ.Implements(marshalTextType) {
@@ -43,6 +44,7 @@ func (e *Encoder) compileHead(ctx *encodeCompileContext) (*opcode, error) {
 	if err != nil {
 		return nil, err
 	}
+	e.convertHeadOnlyCode(code, isPtr)
 	e.optimizeStructEnd(code)
 	return code, nil
 }
@@ -88,6 +90,45 @@ func (e *Encoder) optimizeStructEnd(c *opcode) {
 	}
 }
 
+func (e *Encoder) convertHeadOnlyCode(c *opcode, isPtrHead bool) {
+	if c.nextField == nil {
+		return
+	}
+	if c.nextField.op.codeType() != codeStructEnd {
+		return
+	}
+	switch c.op {
+	case opStructFieldHead:
+		e.convertHeadOnlyCode(c.next, false)
+		if !strings.Contains(c.next.op.String(), "Only") {
+			return
+		}
+		c.op = opStructFieldHeadOnly
+	case opStructFieldHeadOmitEmpty:
+		return
+	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 (e *Encoder) implementsMarshaler(typ *rtype) bool {
 	switch {
 	case typ.Implements(marshalJSONType):
@@ -1102,17 +1143,6 @@ func (e *Encoder) compileStruct(ctx *encodeCompileContext, isPtr bool) (*opcode,
 				anonymousFields[k] = append(anonymousFields[k], v...)
 			}
 		}
-		if fieldNum == 1 && valueCode.op == opPtr {
-			// if field number is one and primitive pointer type,
-			// it should encode as **not** pointer .
-			switch valueCode.next.op {
-			case opInt, opInt8, opInt16, opInt32, opInt64,
-				opUint, opUint8, opUint16, opUint32, opUint64,
-				opFloat32, opFloat64, opBool, opString, opBytes:
-				valueCode = valueCode.next
-				ctx.decOpcodeIndex()
-			}
-		}
 		key := fmt.Sprintf(`"%s":`, tag.key)
 		escapedKey := fmt.Sprintf(`%s:`, string(encodeEscapedString([]byte{}, tag.key)))
 		fieldCode := &opcode{

encode_opcode.go

@@ -53,34 +53,6 @@ func copyOpcode(code *opcode) *opcode {
 	return code.copy(codeMap)
 }
 
-func toIndent(c *opcode) *opcode {
-	c = copyOpcode(c)
-	for code := c; code.op != opEnd; {
-		code.op = code.op.toIndent()
-		switch code.op.codeType() {
-		case codeArrayElem, codeSliceElem, codeMapKey:
-			code = code.end
-		default:
-			code = code.next
-		}
-	}
-	return c
-}
-
-func toEscaped(c *opcode) *opcode {
-	c = copyOpcode(c)
-	for code := c; code.op != opEnd; {
-		code.op = code.op.toEscaped()
-		switch code.op.codeType() {
-		case codeArrayElem, codeSliceElem, codeMapKey:
-			code = code.end
-		default:
-			code = code.next
-		}
-	}
-	return c
-}
-
 func newOpCodeWithNext(ctx *encodeCompileContext, op opType, next *opcode) *opcode {
 	return &opcode{
 		op:         op,