Fix Indent ( validate the input buffer )

This commit is contained in:
Masaaki Goshima 2021-04-19 19:55:12 +09:00
parent 7565171124
commit 34396640d5
3 changed files with 180 additions and 112 deletions

View File

@ -464,20 +464,20 @@ func AppendMarshalJSONIndent(ctx *RuntimeContext, code *Opcode, b []byte, v inte
if err != nil {
return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
}
var compactBuf bytes.Buffer
if err := Compact(&compactBuf, bb, escape); err != nil {
return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
}
var indentBuf bytes.Buffer
if err := Indent(
&indentBuf,
compactBuf.Bytes(),
marshalBuf := ctx.MarshalBuf[:0]
marshalBuf = append(append(marshalBuf, bb...), nul)
indentedBuf, err := doIndent(
b,
marshalBuf,
string(ctx.Prefix)+strings.Repeat(string(ctx.IndentStr), ctx.BaseIndent+indent),
string(ctx.IndentStr),
); err != nil {
escape,
)
if err != nil {
return nil, &errors.MarshalerError{Type: reflect.TypeOf(v), Err: err}
}
return append(b, indentBuf.Bytes()...), nil
ctx.MarshalBuf = marshalBuf
return indentedBuf, nil
}
func AppendMarshalText(code *Opcode, b []byte, v interface{}, escape bool) ([]byte, error) {

View File

@ -2,111 +2,179 @@ package encoder
import (
"bytes"
"fmt"
"github.com/goccy/go-json/internal/errors"
)
func Indent(dst *bytes.Buffer, src []byte, prefix, indentStr string) error {
length := int64(len(src))
indentNum := 0
indentBytes := []byte(indentStr)
for cursor := int64(0); cursor < length; cursor++ {
c := src[cursor]
switch c {
case ' ', '\t', '\n', '\r':
continue
case '"':
if err := dst.WriteByte(c); err != nil {
return err
}
for {
cursor++
if err := dst.WriteByte(src[cursor]); err != nil {
return err
}
switch src[cursor] {
case '\\':
cursor++
if err := dst.WriteByte(src[cursor]); err != nil {
return err
}
case '"':
goto LOOP_END
case '\000':
return errors.ErrUnexpectedEndOfJSON("string", length)
}
}
case '{':
if cursor+1 < length && src[cursor+1] == '}' {
if _, err := dst.Write([]byte{'{', '}'}); err != nil {
return err
}
cursor++
} else {
indentNum++
b := []byte{c, '\n'}
b = append(b, prefix...)
b = append(b, bytes.Repeat(indentBytes, indentNum)...)
if _, err := dst.Write(b); err != nil {
return err
}
}
case '}':
indentNum--
if indentNum < 0 {
return errors.ErrInvalidCharacter('}', "}", cursor)
}
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
}
case '[':
if cursor+1 < length && src[cursor+1] == ']' {
if _, err := dst.Write([]byte{'[', ']'}); err != nil {
return err
}
cursor++
} else {
indentNum++
b := []byte{c, '\n'}
b = append(b, prefix...)
b = append(b, bytes.Repeat(indentBytes, indentNum)...)
if _, err := dst.Write(b); err != nil {
return err
}
}
case ']':
indentNum--
if indentNum < 0 {
return errors.ErrInvalidCharacter(']', "]", cursor)
}
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
}
case ':':
if _, err := dst.Write([]byte{':', ' '}); err != nil {
return err
}
case ',':
b := []byte{',', '\n'}
b = append(b, prefix...)
b = append(b, bytes.Repeat(indentBytes, indentNum)...)
if _, err := dst.Write(b); err != nil {
return err
}
default:
if err := dst.WriteByte(c); err != nil {
return err
}
}
LOOP_END:
func Indent(buf *bytes.Buffer, src []byte, prefix, indentStr string) error {
if len(src) == 0 {
return errors.ErrUnexpectedEndOfJSON("", 0)
}
buf.Grow(len(src))
dst := buf.Bytes()
newSrc := make([]byte, len(src)+1) // append nul byte to the end
copy(newSrc, src)
dst, err := doIndent(dst, newSrc, prefix, indentStr, false)
if err != nil {
return err
}
if _, err := buf.Write(dst); err != nil {
return err
}
return nil
}
func doIndent(dst, src []byte, prefix, indentStr string, escape bool) ([]byte, error) {
buf, _, err := indentValue(dst, src, 0, 0, []byte(prefix), []byte(indentStr), escape)
if err != nil {
return nil, err
}
return buf, nil
}
func indentValue(
dst []byte,
src []byte,
indentNum int,
cursor int64,
prefix []byte,
indentBytes []byte,
escape bool) ([]byte, int64, error) {
for {
switch src[cursor] {
case ' ', '\t', '\n', '\r':
cursor++
continue
case '{':
return indentObject(dst, src, indentNum, cursor, prefix, indentBytes, escape)
case '}':
return nil, 0, errors.ErrSyntax("unexpected character '}'", cursor)
case '[':
return indentArray(dst, src, indentNum, cursor, prefix, indentBytes, escape)
case ']':
return nil, 0, errors.ErrSyntax("unexpected character ']'", cursor)
case '"':
return compactString(dst, src, cursor, escape)
case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
return compactNumber(dst, src, cursor)
case 't':
return compactTrue(dst, src, cursor)
case 'f':
return compactFalse(dst, src, cursor)
case 'n':
return compactNull(dst, src, cursor)
default:
return nil, 0, errors.ErrSyntax(fmt.Sprintf("unexpected character '%c'", src[cursor]), cursor)
}
}
}
func indentObject(
dst []byte,
src []byte,
indentNum int,
cursor int64,
prefix []byte,
indentBytes []byte,
escape bool) ([]byte, int64, error) {
switch src[cursor] {
case 'n':
return compactNull(dst, src, cursor)
case '{':
dst = append(dst, '{')
default:
return nil, 0, errors.ErrExpected("expected { character for object value", cursor)
}
cursor = skipWhiteSpace(src, cursor+1)
if src[cursor] == '}' {
dst = append(dst, '}')
return dst, cursor + 1, nil
}
indentNum++
var err error
for {
dst = append(append(append(dst, '\n'), prefix...), bytes.Repeat(indentBytes, indentNum)...)
cursor = skipWhiteSpace(src, cursor)
dst, cursor, err = compactString(dst, src, cursor, escape)
if err != nil {
return nil, 0, err
}
cursor = skipWhiteSpace(src, cursor)
if src[cursor] != ':' {
return nil, 0, errors.ErrSyntax(
fmt.Sprintf("invalid character '%c' after object key", src[cursor]),
cursor+1,
)
}
dst = append(dst, ':', ' ')
dst, cursor, err = indentValue(dst, src, indentNum, cursor+1, prefix, indentBytes, escape)
if err != nil {
return nil, 0, err
}
cursor = skipWhiteSpace(src, cursor)
switch src[cursor] {
case '}':
dst = append(append(append(dst, '\n'), prefix...), bytes.Repeat(indentBytes, indentNum-1)...)
dst = append(dst, '}')
cursor++
return dst, cursor, nil
case ',':
dst = append(dst, ',')
default:
return nil, 0, errors.ErrSyntax(
fmt.Sprintf("invalid character '%c' after object key:value pair", src[cursor]),
cursor+1,
)
}
cursor++
}
}
func indentArray(
dst []byte,
src []byte,
indentNum int,
cursor int64,
prefix []byte,
indentBytes []byte,
escape bool) ([]byte, int64, error) {
switch src[cursor] {
case 'n':
return compactNull(dst, src, cursor)
case '[':
dst = append(dst, '[')
default:
return nil, 0, errors.ErrExpected("expected [ character for array value", cursor)
}
cursor = skipWhiteSpace(src, cursor+1)
if src[cursor] == ']' {
dst = append(dst, ']')
return dst, cursor + 1, nil
}
indentNum++
var err error
for {
dst = append(append(append(dst, '\n'), prefix...), bytes.Repeat(indentBytes, indentNum)...)
dst, cursor, err = indentValue(dst, src, indentNum, cursor, prefix, indentBytes, escape)
if err != nil {
return nil, 0, err
}
cursor = skipWhiteSpace(src, cursor)
switch src[cursor] {
case ']':
dst = append(append(append(dst, '\n'), prefix...), bytes.Repeat(indentBytes, indentNum-1)...)
dst = append(dst, ']')
cursor++
return dst, cursor, nil
case ',':
dst = append(dst, ',')
default:
return nil, 0, errors.ErrSyntax(
fmt.Sprintf("invalid character '%c' after array value", src[cursor]),
cursor+1,
)
}
cursor++
}
}

View File

@ -197,7 +197,7 @@ func TestIndentErrors(t *testing.T) {
buf := bytes.NewBuffer(slice)
if err := json.Indent(buf, []uint8(tt.in), "", ""); err != nil {
if !reflect.DeepEqual(err, tt.err) {
t.Errorf("#%d: Indent: %#v", i, err)
t.Errorf("#%d: Indent: expected %#v but got %#v", i, tt.err, err)
continue
}
}