Fix handling of comma as delimiter

encode.go

@@ -102,6 +102,11 @@ func (e *Encoder) EncodeWithOption(v interface{}, opts ...EncodeOption) error {
 	if err := e.encode(v); err != nil {
 		return err
 	}
+	if e.enabledIndent {
+		e.buf = e.buf[:len(e.buf)-2]
+	} else {
+		e.buf = e.buf[:len(e.buf)-1]
+	}
 	e.buf = append(e.buf, '\n')
 	if _, err := e.w.Write(e.buf); err != nil {
 		return err
@@ -147,16 +152,11 @@ func (e *Encoder) encodeForMarshal(v interface{}) ([]byte, error) {
 		return nil, err
 	}
 	if e.enabledIndent {
-		last := len(e.buf) - 1
-		if e.buf[last] == '\n' {
-			last--
-		}
-		length := last + 1
-		copied := make([]byte, length)
-		copy(copied, e.buf[0:length])
+		copied := make([]byte, len(e.buf)-2)
+		copy(copied, e.buf)
 		return copied, nil
 	}
-	copied := make([]byte, len(e.buf))
+	copied := make([]byte, len(e.buf)-1)
 	copy(copied, e.buf)
 	return copied, nil
 }
@@ -164,6 +164,11 @@ func (e *Encoder) encodeForMarshal(v interface{}) ([]byte, error) {
 func (e *Encoder) encode(v interface{}) error {
 	if v == nil {
 		e.encodeNull()
+		if e.enabledIndent {
+			e.encodeBytes([]byte{',', '\n'})
+		} else {
+			e.encodeByte(',')
+		}
 		return nil
 	}
 	header := (*interfaceHeader)(unsafe.Pointer(&v))

encode_compile.go

@@ -427,32 +427,60 @@ func (e *Encoder) typeToHeaderType(op opType) opType {
 	switch op {
 	case opInt:
 		return opStructFieldHeadInt
+	case opIntIndent:
+		return opStructFieldHeadIntIndent
 	case opInt8:
 		return opStructFieldHeadInt8
+	case opInt8Indent:
+		return opStructFieldHeadInt8Indent
 	case opInt16:
 		return opStructFieldHeadInt16
+	case opInt16Indent:
+		return opStructFieldHeadInt16Indent
 	case opInt32:
 		return opStructFieldHeadInt32
+	case opInt32Indent:
+		return opStructFieldHeadInt32Indent
 	case opInt64:
 		return opStructFieldHeadInt64
+	case opInt64Indent:
+		return opStructFieldHeadInt64Indent
 	case opUint:
 		return opStructFieldHeadUint
+	case opUintIndent:
+		return opStructFieldHeadUintIndent
 	case opUint8:
 		return opStructFieldHeadUint8
+	case opUint8Indent:
+		return opStructFieldHeadUint8Indent
 	case opUint16:
 		return opStructFieldHeadUint16
+	case opUint16Indent:
+		return opStructFieldHeadUint16Indent
 	case opUint32:
 		return opStructFieldHeadUint32
+	case opUint32Indent:
+		return opStructFieldHeadUint32Indent
 	case opUint64:
 		return opStructFieldHeadUint64
+	case opUint64Indent:
+		return opStructFieldHeadUint64Indent
 	case opFloat32:
 		return opStructFieldHeadFloat32
+	case opFloat32Indent:
+		return opStructFieldHeadFloat32Indent
 	case opFloat64:
 		return opStructFieldHeadFloat64
+	case opFloat64Indent:
+		return opStructFieldHeadFloat64Indent
 	case opString:
 		return opStructFieldHeadString
+	case opStringIndent:
+		return opStructFieldHeadStringIndent
 	case opBool:
 		return opStructFieldHeadBool
+	case opBoolIndent:
+		return opStructFieldHeadBoolIndent
 	case opMapHead:
 		return opStructFieldHeadMap
 	case opMapHeadLoad:
@@ -475,8 +503,12 @@ func (e *Encoder) typeToHeaderType(op opType) opType {
 		return opStructFieldHeadStructIndent
 	case opMarshalJSON:
 		return opStructFieldHeadMarshalJSON
+	case opMarshalJSONIndent:
+		return opStructFieldHeadMarshalJSONIndent
 	case opMarshalText:
 		return opStructFieldHeadMarshalText
+	case opMarshalTextIndent:
+		return opStructFieldHeadMarshalTextIndent
 	}
 	return opStructFieldHead
 }
@@ -516,32 +548,60 @@ func (e *Encoder) typeToFieldType(code *opcode) opType {
 		}
 	case opInt:
 		return opStructFieldInt
+	case opIntIndent:
+		return opStructFieldIntIndent
 	case opInt8:
 		return opStructFieldInt8
+	case opInt8Indent:
+		return opStructFieldInt8Indent
 	case opInt16:
 		return opStructFieldInt16
+	case opInt16Indent:
+		return opStructFieldInt16Indent
 	case opInt32:
 		return opStructFieldInt32
+	case opInt32Indent:
+		return opStructFieldInt32Indent
 	case opInt64:
 		return opStructFieldInt64
+	case opInt64Indent:
+		return opStructFieldInt64Indent
 	case opUint:
 		return opStructFieldUint
+	case opUintIndent:
+		return opStructFieldUintIndent
 	case opUint8:
 		return opStructFieldUint8
+	case opUint8Indent:
+		return opStructFieldUint8Indent
 	case opUint16:
 		return opStructFieldUint16
+	case opUint16Indent:
+		return opStructFieldUint16Indent
 	case opUint32:
 		return opStructFieldUint32
+	case opUint32Indent:
+		return opStructFieldUint32Indent
 	case opUint64:
 		return opStructFieldUint64
+	case opUint64Indent:
+		return opStructFieldUint64Indent
 	case opFloat32:
 		return opStructFieldFloat32
+	case opFloat32Indent:
+		return opStructFieldFloat32Indent
 	case opFloat64:
 		return opStructFieldFloat64
+	case opFloat64Indent:
+		return opStructFieldFloat64Indent
 	case opString:
 		return opStructFieldString
+	case opStringIndent:
+		return opStructFieldStringIndent
 	case opBool:
 		return opStructFieldBool
+	case opBoolIndent:
+		return opStructFieldBoolIndent
 	case opMapHead:
 		return opStructFieldMap
 	case opMapHeadLoad:
@@ -564,8 +624,12 @@ func (e *Encoder) typeToFieldType(code *opcode) opType {
 		return opStructFieldStructIndent
 	case opMarshalJSON:
 		return opStructFieldMarshalJSON
+	case opMarshalJSONIndent:
+		return opStructFieldMarshalJSONIndent
 	case opMarshalText:
 		return opStructFieldMarshalText
+	case opMarshalTextIndent:
+		return opStructFieldMarshalTextIndent
 	}
 	return opStructField
 }

encode_opcode.go

@@ -53,6 +53,9 @@ func copyOpcode(code *opcode) *opcode {
 }
 
 func newOpCodeWithNext(ctx *encodeCompileContext, op opType, next *opcode) *opcode {
+	if op != opEnd && ctx.withIndent {
+		op = op.toIndent()
+	}
 	return &opcode{
 		op:         op,
 		typ:        ctx.typ,

json.go

@@ -394,7 +394,7 @@ func HTMLEscape(dst *bytes.Buffer, src []byte) {
 	enc := NewEncoder(dst)
 	enc.SetEscapeHTML(true)
 	enc.encode(v)
-	dst.Write(enc.buf)
+	dst.Write(enc.buf[:len(enc.buf)-1]) // remove last ',' character
 }
 
 // Valid reports whether data is a valid JSON encoding.