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encode.go
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encode.go
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package jsonw
import (
"encoding/base64"
"strconv"
"time"
"unicode/utf8"
"github.com/neilotoole/sq/libsq/core/record"
"github.com/neilotoole/sq/cli/output"
"github.com/neilotoole/sq/cli/output/jsonw/internal"
"github.com/neilotoole/sq/libsq/core/errz"
"github.com/neilotoole/sq/libsq/core/kind"
"github.com/neilotoole/sq/libsq/core/stringz"
)
// monoEncoder provides methods for encoding JSON values
// without colorization (that is, in monochrome).
type monoEncoder struct {
formatDatetime func(time.Time) string
formatDatetimeAsNumber bool
formatDate func(time.Time) string
formatDateAsNumber bool
formatTime func(time.Time) string
formatTimeAsNumber bool
}
func (e monoEncoder) encodeTime(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatTime, e.formatTimeAsNumber)
}
func (e monoEncoder) encodeDatetime(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatDatetime, e.formatDatetimeAsNumber)
}
func (e monoEncoder) encodeDate(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatDate, e.formatDateAsNumber)
}
func (e monoEncoder) doEncodeTime(b []byte, v any, fn func(time.Time) string, asNumber bool) ([]byte, error) {
switch v := v.(type) {
case nil:
return append(b, "null"...), nil
case time.Time:
s := fn(v)
if asNumber {
if i, err := strconv.ParseInt(s, 10, 64); err == nil {
b = strconv.AppendInt(b, i, 10)
return b, nil
}
}
b = append(b, '"')
b = append(b, []byte(s)...)
b = append(b, '"')
return b, nil
case string:
// If we've got a string, assume it's in the correct format
return encodeString(b, v, false)
default:
return b, errz.Errorf("unsupported time type %T: %v", v, v)
}
}
func (e monoEncoder) encodeAny(b []byte, v any) ([]byte, error) {
switch v := v.(type) {
default:
return b, errz.Errorf("unexpected record field type %T: %#v", v, v)
case nil:
return append(b, "null"...), nil
case int64:
return strconv.AppendInt(b, v, 10), nil
case float64:
return append(b, stringz.FormatFloat(v)...), nil
case bool:
return strconv.AppendBool(b, v), nil
case []byte:
var err error
b, err = encodeBytes(b, v)
if err != nil {
return b, errz.Err(err)
}
return b, nil
case string:
var err error
b, err = encodeString(b, v, false)
if err != nil {
return b, errz.Err(err)
}
return b, nil
case time.Time:
// We really shouldn't be hitting this path? Instead should
// hit encodeTime.
return e.doEncodeTime(b, v, e.formatDatetime, e.formatDatetimeAsNumber)
}
}
// colorEncoder provides methods for encoding JSON values
// with color.
type colorEncoder struct {
clrs internal.Colors
formatDatetime func(time.Time) string
formatDatetimeAsNumber bool
formatDate func(time.Time) string
formatDateAsNumber bool
formatTime func(time.Time) string
formatTimeAsNumber bool
}
func (e *colorEncoder) encodeTime(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatTime, e.formatTimeAsNumber)
}
func (e *colorEncoder) encodeDatetime(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatDatetime, e.formatDatetimeAsNumber)
}
func (e *colorEncoder) encodeDate(b []byte, v any) ([]byte, error) {
return e.doEncodeTime(b, v, e.formatDate, e.formatDateAsNumber)
}
func (e *colorEncoder) doEncodeTime(b []byte, v any, fn func(time.Time) string, asNumber bool) ([]byte, error) {
start := len(b)
switch v := v.(type) {
case nil:
return e.clrs.AppendNull(b), nil
case time.Time:
b = append(b, e.clrs.Time.Prefix...)
s := fn(v)
if asNumber {
if i, err := strconv.ParseInt(s, 10, 64); err == nil {
b = strconv.AppendInt(b, i, 10)
b = append(b, e.clrs.Time.Suffix...)
return b, nil
}
}
b = append(b, '"')
b = append(b, []byte(s)...)
b = append(b, '"')
b = append(b, e.clrs.Time.Suffix...)
return b, nil
case string:
// If we've got a string, assume it's in the correct format
b = append(b, e.clrs.Time.Prefix...)
var err error
b, err = encodeString(b, v, false)
if err != nil {
return b[0:start], err
}
b = append(b, e.clrs.Time.Suffix...)
return b, nil
default:
return b, errz.Errorf("unsupported time type %T: %v", v, v)
}
}
func (e *colorEncoder) encodeAny(b []byte, v any) ([]byte, error) {
switch v := v.(type) {
default:
return b, errz.Errorf("unexpected record field type %T: %#v", v, v)
case nil:
return e.clrs.AppendNull(b), nil
case int64:
b = append(b, e.clrs.Number.Prefix...)
b = strconv.AppendInt(b, v, 10)
return append(b, e.clrs.Number.Suffix...), nil
case float64:
b = append(b, e.clrs.Number.Prefix...)
b = append(b, stringz.FormatFloat(v)...)
return append(b, e.clrs.Number.Suffix...), nil
case bool:
b = append(b, e.clrs.Bool.Prefix...)
b = strconv.AppendBool(b, v)
return append(b, e.clrs.Bool.Suffix...), nil
case []byte:
var err error
b = append(b, e.clrs.Bytes.Prefix...)
b, err = encodeBytes(b, v)
if err != nil {
return b, errz.Err(err)
}
b = append(b, e.clrs.Bytes.Suffix...)
return b, nil
case string:
b = append(b, e.clrs.String.Prefix...)
var err error
b, err = encodeString(b, v, false)
if err != nil {
return b, errz.Err(err)
}
return append(b, e.clrs.String.Suffix...), nil
case time.Time:
// We really shouldn't be hitting this path? Instead should
// hit encodeTime.
return e.doEncodeTime(b, v, e.formatDatetime, e.formatDatetimeAsNumber)
}
}
// punc holds the byte values of JSON punctuation chars
// like left bracket "[", right brace "}" etc. When
// colorizing, these values will include the terminal color codes.
type punc struct {
comma []byte
colon []byte
lBrace []byte
rBrace []byte
lBracket []byte
rBracket []byte
// null is also included in punc just for convenience
null []byte
}
func newPunc(pr *output.Printing) punc {
var p punc
if pr == nil || pr.IsMonochrome() || pr.Compact {
p.comma = append(p.comma, ',')
p.colon = append(p.colon, ':')
p.lBrace = append(p.lBrace, '{')
p.rBrace = append(p.rBrace, '}')
p.lBracket = append(p.lBracket, '[')
p.rBracket = append(p.rBracket, ']')
p.null = append(p.null, "null"...)
return p
}
clrs := internal.NewColors(pr)
p.comma = clrs.AppendPunc(p.comma, ',')
p.colon = clrs.AppendPunc(p.colon, ':')
p.lBrace = clrs.AppendPunc(p.lBrace, '{')
p.rBrace = clrs.AppendPunc(p.rBrace, '}')
p.lBracket = clrs.AppendPunc(p.lBracket, '[')
p.rBracket = clrs.AppendPunc(p.rBracket, ']')
p.null = clrs.AppendNull(p.null)
return p
}
func getFieldEncoders(recMeta record.Meta, pr *output.Printing) []func(b []byte, v any) ([]byte, error) {
encodeFns := make([]func(b []byte, v any) ([]byte, error), len(recMeta))
if pr.IsMonochrome() {
enc := monoEncoder{
formatDatetime: pr.FormatDatetime,
formatDatetimeAsNumber: pr.FormatDatetimeAsNumber,
formatDate: pr.FormatDate,
formatDateAsNumber: pr.FormatDateAsNumber,
formatTime: pr.FormatTime,
formatTimeAsNumber: pr.FormatTimeAsNumber,
}
for i := 0; i < len(recMeta); i++ {
switch recMeta[i].Kind() { //nolint:exhaustive
case kind.Time:
encodeFns[i] = enc.encodeTime
case kind.Date:
encodeFns[i] = enc.encodeDate
case kind.Datetime:
encodeFns[i] = enc.encodeDatetime
default:
encodeFns[i] = enc.encodeAny
}
}
return encodeFns
}
clrs := internal.NewColors(pr)
// Else, we want color encoders
enc := &colorEncoder{
clrs: clrs,
formatDatetime: pr.FormatDatetime,
formatDatetimeAsNumber: pr.FormatDatetimeAsNumber,
formatDate: pr.FormatDate,
formatDateAsNumber: pr.FormatDateAsNumber,
formatTime: pr.FormatTime,
formatTimeAsNumber: pr.FormatTimeAsNumber,
}
for i := 0; i < len(recMeta); i++ {
switch recMeta[i].Kind() { //nolint:exhaustive
case kind.Time:
encodeFns[i] = enc.encodeTime
case kind.Date:
encodeFns[i] = enc.encodeDate
case kind.Datetime:
encodeFns[i] = enc.encodeDatetime
default:
encodeFns[i] = enc.encodeAny
}
}
return encodeFns
}
// encodeString encodes s, appending to b and returning
// the resulting []byte.
func encodeString(b []byte, s string, escapeHTML bool) ([]byte, error) { //nolint:unparam
// This function is copied from the segment.io JSON encoder.
const hex = "0123456789abcdef"
i := 0
j := 0
b = append(b, '"')
for j < len(s) {
c := s[j]
if c >= 0x20 && c <= 0x7f && c != '\\' && c != '"' && (!escapeHTML || (c != '<' && c != '>' && c != '&')) {
// fast path: most of the time, printable ascii characters are used
j++
continue
}
switch c {
case '\\', '"':
b = append(b, s[i:j]...)
b = append(b, '\\', c)
i = j + 1
j++
continue
case '\n':
b = append(b, s[i:j]...)
b = append(b, '\\', 'n')
i = j + 1
j++
continue
case '\r':
b = append(b, s[i:j]...)
b = append(b, '\\', 'r')
i = j + 1
j++
continue
case '\t':
b = append(b, s[i:j]...)
b = append(b, '\\', 't')
i = j + 1
j++
continue
case '<', '>', '&':
b = append(b, s[i:j]...)
b = append(b, `\u00`...)
b = append(b, hex[c>>4], hex[c&0xF])
i = j + 1
j++
continue
}
// This encodes bytes < 0x20 except for \t, \n and \r.
if c < 0x20 {
b = append(b, s[i:j]...)
b = append(b, `\u00`...)
b = append(b, hex[c>>4], hex[c&0xF])
i = j + 1
j++
continue
}
r, size := utf8.DecodeRuneInString(s[j:])
if r == utf8.RuneError && size == 1 {
b = append(b, s[i:j]...)
b = append(b, `\ufffd`...)
i = j + size
j += size
continue
}
switch r {
case '\u2028', '\u2029':
// U+2028 is LINE SEPARATOR.
// U+2029 is PARAGRAPH SEPARATOR.
// They are both technically valid characters in JSON strings,
// but don't work in JSONP, which has to be evaluated as JavaScript,
// and can lead to security holes there. It is valid JSON to
// escape them, so we do so unconditionally.
// See http://timelessrepo.com/json-isnt-a-javascript-subset for discussion.
b = append(b, s[i:j]...)
b = append(b, `\u202`...)
b = append(b, hex[r&0xF])
i = j + size
j += size
continue
}
j += size
}
b = append(b, s[i:]...)
b = append(b, '"')
return b, nil
}
// encodeBytes encodes v in base64 and appends to b, returning
// the resulting slice.
func encodeBytes(b, v []byte) ([]byte, error) { //nolint:unparam
// This function is copied from the segment.io JSON encoder.
if v == nil {
return append(b, "null"...), nil
}
n := base64.StdEncoding.EncodedLen(len(v)) + 2
if avail := cap(b) - len(b); avail < n {
newB := make([]byte, cap(b)+(n-avail))
copy(newB, b)
b = newB[:len(b)]
}
i := len(b)
j := len(b) + n
b = b[:j]
b[i] = '"'
base64.StdEncoding.Encode(b[i+1:j-1], v)
b[j-1] = '"'
return b, nil
}