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|
package encoder
import (
"bytes"
"fmt"
"github.com/goccy/go-json/internal/errors"
)
func takeIndentSrcRuntimeContext(src []byte) (*RuntimeContext, []byte) {
ctx := TakeRuntimeContext()
buf := ctx.Buf[:0]
buf = append(append(buf, src...), nul)
ctx.Buf = buf
return ctx, buf
}
func Indent(buf *bytes.Buffer, src []byte, prefix, indentStr string) error {
if len(src) == 0 {
return errors.ErrUnexpectedEndOfJSON("", 0)
}
srcCtx, srcBuf := takeIndentSrcRuntimeContext(src)
dstCtx := TakeRuntimeContext()
dst := dstCtx.Buf[:0]
dst, err := indentAndWrite(buf, dst, srcBuf, prefix, indentStr)
if err != nil {
ReleaseRuntimeContext(srcCtx)
ReleaseRuntimeContext(dstCtx)
return err
}
dstCtx.Buf = dst
ReleaseRuntimeContext(srcCtx)
ReleaseRuntimeContext(dstCtx)
return nil
}
func indentAndWrite(buf *bytes.Buffer, dst []byte, src []byte, prefix, indentStr string) ([]byte, error) {
dst, err := doIndent(dst, src, prefix, indentStr, false)
if err != nil {
return nil, err
}
if _, err := buf.Write(dst); err != nil {
return nil, err
}
return dst, nil
}
func doIndent(dst, src []byte, prefix, indentStr string, escape bool) ([]byte, error) {
buf, cursor, err := indentValue(dst, src, 0, 0, []byte(prefix), []byte(indentStr), escape)
if err != nil {
return nil, err
}
if err := validateEndBuf(src, cursor); 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) {
if src[cursor] == '{' {
dst = append(dst, '{')
} else {
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(dst, '\n'), prefix...)
for i := 0; i < indentNum; i++ {
dst = append(dst, indentBytes...)
}
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(dst, '\n'), prefix...)
for i := 0; i < indentNum-1; i++ {
dst = append(dst, indentBytes...)
}
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) {
if src[cursor] == '[' {
dst = append(dst, '[')
} else {
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(dst, '\n'), prefix...)
for i := 0; i < indentNum; i++ {
dst = append(dst, indentBytes...)
}
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(dst, '\n'), prefix...)
for i := 0; i < indentNum-1; i++ {
dst = append(dst, indentBytes...)
}
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++
}
}
|
