Fix encoding for Indent/MarshalIndent

encode_vm.go

@@ -147,12 +147,22 @@ func (e *Encoder) run(code *opcode) error {
 				)
 			}
 			var buf bytes.Buffer
+			if e.enabledIndent {
+				if err := encodeWithIndent(
+					&buf,
+					b,
+					string(e.prefix)+string(bytes.Repeat(e.indentStr, code.indent)),
+					string(e.indentStr),
+				); err != nil {
+					return err
+				}
+			} else {
 				if err := compact(&buf, b, true); err != nil {
 					return err
 				}
+			}
 			e.encodeBytes(buf.Bytes())
 			code = code.next
-			code.ptr = ptr
 		case opMarshalText:
 			ptr := code.ptr
 			isPtr := code.typ.Kind() == reflect.Ptr
@@ -276,7 +286,7 @@ func (e *Encoder) run(code *opcode) error {
 			} else {
 				e.encodeByte('\n')
 				e.encodeIndent(code.indent)
-				e.encodeBytes([]byte{']'})
+				e.encodeByte(']')
 				code = c.end.next
 			}
 		case opArrayHead:
@@ -1352,15 +1362,19 @@ func (e *Encoder) run(code *opcode) error {
 			field := code.toStructFieldCode()
 			ptr := field.ptr
 			if ptr == 0 {
+				if code.op == opStructFieldPtrHeadIntIndent {
 					e.encodeIndent(code.indent)
 					e.encodeNull()
+				} else {
+					e.encodeBytes([]byte{'{', '}'})
+				}
 				code = field.end
 			} else {
 				e.encodeBytes([]byte{'{', '\n'})
 				e.encodeIndent(code.indent + 1)
 				e.encodeBytes(field.key)
 				e.encodeByte(' ')
-				e.encodeInt(e.ptrToInt(ptr))
+				e.encodeInt(e.ptrToInt(ptr + field.offset))
 				field.nextField.ptr = ptr
 				code = field.next
 			}

indent.go

@@ -52,9 +52,10 @@ func encodeWithIndent(dst *bytes.Buffer, src []byte, prefix, indentStr string) e
 			if indentNum < 0 {
 				return errInvalidCharacter('}', "}", cursor)
 			}
-			b := []byte{'\n', c}
+			b := []byte{'\n'}
 			b = append(b, prefix...)
 			b = append(b, bytes.Repeat(indentBytes, indentNum)...)
+			b = append(b, c)
 			if _, err := dst.Write(b); err != nil {
 				return err
 			}
@@ -78,9 +79,10 @@ func encodeWithIndent(dst *bytes.Buffer, src []byte, prefix, indentStr string) e
 			if indentNum < 0 {
 				return errInvalidCharacter(']', "]", cursor)
 			}
-			b := []byte{'\n', c}
+			b := []byte{'\n'}
 			b = append(b, prefix...)
 			b = append(b, bytes.Repeat(indentBytes, indentNum)...)
+			b = append(b, c)
 			if _, err := dst.Write(b); err != nil {
 				return err
 			}