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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
// Package json is a wrapper around lowmemjson that is a (mostly)
// drop-in replacement for the standard library's encoding/json.
package json
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"io"
"strconv"
"git.lukeshu.com/go/lowmemjson"
)
//nolint:stylecheck // ST1021 False positive; these aren't comments on individual types.
type (
Number = json.Number
RawMessage = json.RawMessage
Marshaler = json.Marshaler
Unmarshaler = json.Unmarshaler
// low-level decode errors.
UnmarshalTypeError = json.UnmarshalTypeError
// SyntaxError = json.SyntaxError // Duplicated to access a private field.
// high-level decode errors.
InvalidUnmarshalError = json.InvalidUnmarshalError
// marshal errors.
UnsupportedTypeError = json.UnsupportedTypeError
UnsupportedValueError = json.UnsupportedValueError
// MarshalerError = json.MarshalerError // Duplicated to access a private field.
)
// Encode wrappers ///////////////////////////////////////////////////
func convertEncodeError(err error) error {
if me, ok := err.(*lowmemjson.EncodeMethodError); ok {
err = &MarshalerError{
Type: me.Type,
Err: me.Err,
sourceFunc: me.SourceFunc,
}
}
return err
}
func marshal(v any, formatter *lowmemjson.ReEncoder) ([]byte, error) {
var buf bytes.Buffer
formatter.Out = &buf
if err := convertEncodeError(lowmemjson.NewEncoder(formatter).Encode(v)); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func MarshalIndent(v any, prefix, indent string) ([]byte, error) {
return marshal(v, &lowmemjson.ReEncoder{
Indent: indent,
Prefix: prefix,
})
}
func Marshal(v any) ([]byte, error) {
return marshal(v, &lowmemjson.ReEncoder{
Compact: true,
})
}
type Encoder struct {
encoder *lowmemjson.Encoder
formatter lowmemjson.ReEncoder
}
func NewEncoder(w io.Writer) *Encoder {
ret := &Encoder{
formatter: lowmemjson.ReEncoder{
Out: w,
AllowMultipleValues: true,
Compact: true,
ForceTrailingNewlines: true,
},
}
ret.encoder = lowmemjson.NewEncoder(&ret.formatter)
return ret
}
func (enc *Encoder) Encode(v any) error {
return convertEncodeError(enc.encoder.Encode(v))
}
func (enc *Encoder) SetEscapeHTML(on bool) {
var escaper lowmemjson.BackslashEscaper
if !on {
escaper = lowmemjson.EscapeDefaultNonHTMLSafe
}
enc.formatter.BackslashEscape = escaper
}
func (enc *Encoder) SetIndent(prefix, indent string) {
enc.formatter.Compact = prefix == "" && indent == ""
enc.formatter.Prefix = prefix
enc.formatter.Indent = indent
}
// ReEncode wrappers /////////////////////////////////////////////////
func convertReEncodeError(err error) error {
if se, ok := err.(*lowmemjson.ReEncodeSyntaxError); ok {
err = &SyntaxError{
msg: se.Err.Error(),
Offset: se.Offset + 1,
}
if errors.Is(se.Err, io.ErrUnexpectedEOF) {
err.(*SyntaxError).msg = "unexpected end of JSON input"
}
}
return err
}
func HTMLEscape(dst *bytes.Buffer, src []byte) {
formatter := &lowmemjson.ReEncoder{
Out: dst,
}
_, _ = formatter.Write(src)
}
func reencode(src []byte, formatter *lowmemjson.ReEncoder) error {
_, err := formatter.Write(src)
if err == nil {
err = formatter.Close()
}
return convertReEncodeError(err)
}
func Compact(dst *bytes.Buffer, src []byte) error {
return reencode(src, &lowmemjson.ReEncoder{
Out: dst,
Compact: true,
BackslashEscape: lowmemjson.EscapePreserve,
})
}
func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
return reencode(src, &lowmemjson.ReEncoder{
Out: dst,
Indent: indent,
Prefix: prefix,
BackslashEscape: lowmemjson.EscapePreserve,
})
}
func Valid(data []byte) bool {
formatter := &lowmemjson.ReEncoder{
Out: io.Discard,
Compact: true,
}
_, err := formatter.Write(data)
return err == nil
}
// Decode wrappers ///////////////////////////////////////////////////
func convertDecodeError(err error) error {
if derr, ok := err.(*lowmemjson.DecodeError); ok {
switch terr := derr.Err.(type) {
case *lowmemjson.DecodeSyntaxError:
switch {
case errors.Is(terr.Err, io.EOF):
err = io.EOF
case errors.Is(terr.Err, io.ErrUnexpectedEOF):
err = &SyntaxError{
msg: "unexpected end of JSON input",
Offset: terr.Offset,
}
default:
err = &SyntaxError{
msg: terr.Err.Error(),
Offset: terr.Offset,
}
}
case *lowmemjson.DecodeTypeError:
if typeErr, ok := terr.Err.(*json.UnmarshalTypeError); ok {
err = &UnmarshalTypeError{
Value: typeErr.Value,
Type: typeErr.Type,
Offset: typeErr.Offset,
Struct: derr.FieldParent,
Field: derr.FieldName,
}
} else if _, isArgErr := terr.Err.(*lowmemjson.DecodeArgumentError); terr.Err != nil &&
!isArgErr &&
!errors.Is(terr.Err, lowmemjson.ErrDecodeNonEmptyInterface) &&
!errors.Is(terr.Err, strconv.ErrSyntax) &&
!errors.Is(terr.Err, strconv.ErrRange) {
err = terr.Err
} else {
err = &UnmarshalTypeError{
Value: terr.JSONType,
Type: terr.GoType,
Offset: terr.Offset,
Struct: derr.FieldParent,
Field: derr.FieldName,
}
}
}
}
return err
}
func Unmarshal(data []byte, ptr any) error {
return convertDecodeError(lowmemjson.NewDecoder(bytes.NewReader(data)).DecodeThenEOF(ptr))
}
type Decoder struct {
*lowmemjson.Decoder
buf *bufio.Reader
}
func NewDecoder(r io.Reader) *Decoder {
br, ok := r.(*bufio.Reader)
if !ok {
br = bufio.NewReader(r)
}
return &Decoder{
Decoder: lowmemjson.NewDecoder(br),
buf: br,
}
}
func (dec *Decoder) Decode(ptr any) error {
return convertDecodeError(dec.Decoder.Decode(ptr))
}
func (dec *Decoder) Buffered() io.Reader {
dat, _ := dec.buf.Peek(dec.buf.Buffered())
return bytes.NewReader(dat)
}
// func (dec *Decoder) Token() (Token, error)
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