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package text
import (
"bytes"
"embed"
"encoding/base64"
"encoding/hex"
"fmt"
"io"
"strings"
"github.com/wader/fq/pkg/bitio"
"github.com/wader/fq/pkg/interp"
"golang.org/x/text/encoding"
"golang.org/x/text/encoding/charmap"
"golang.org/x/text/encoding/unicode"
)
//go:embed encoding.jq
var textFS embed.FS
func init() {
interp.RegisterFunc0("from_hex", func(_ *interp.Interp, c string) any {
b, err := hex.DecodeString(c)
if err != nil {
return err
}
bb, err := interp.NewBinaryFromBitReader(bitio.NewBitReader(b, -1), 8, 0)
if err != nil {
return err
}
return bb
})
interp.RegisterFunc0("to_hex", func(_ *interp.Interp, c any) any {
br, err := interp.ToBitReader(c)
if err != nil {
return err
}
buf := &bytes.Buffer{}
if _, err := io.Copy(hex.NewEncoder(buf), bitio.NewIOReader(br)); err != nil {
return err
}
return buf.String()
})
// TODO: other encodings and share?
base64Encoding := func(enc string) *base64.Encoding {
switch enc {
case "url":
return base64.URLEncoding
case "rawstd":
return base64.RawStdEncoding
case "rawurl":
return base64.RawURLEncoding
default:
return base64.StdEncoding
}
}
type fromBase64Opts struct {
Encoding string
}
interp.RegisterFunc1("_from_base64", func(_ *interp.Interp, c string, opts fromBase64Opts) any {
b, err := base64Encoding(opts.Encoding).DecodeString(c)
if err != nil {
return err
}
bin, err := interp.NewBinaryFromBitReader(bitio.NewBitReader(b, -1), 8, 0)
if err != nil {
return err
}
return bin
})
type toBase64Opts struct {
Encoding string
}
interp.RegisterFunc1("_to_base64", func(_ *interp.Interp, c any, opts toBase64Opts) any {
br, err := interp.ToBitReader(c)
if err != nil {
return err
}
bb := &bytes.Buffer{}
wc := base64.NewEncoder(base64Encoding(opts.Encoding), bb)
if _, err := io.Copy(wc, bitio.NewIOReader(br)); err != nil {
return err
}
wc.Close()
return bb.String()
})
strEncoding := func(s string) encoding.Encoding {
switch s {
case "UTF8":
return unicode.UTF8
case "UTF16":
return unicode.UTF16(unicode.LittleEndian, unicode.UseBOM)
case "UTF16LE":
return unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
case "UTF16BE":
return unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM)
case "CodePage037":
return charmap.CodePage037
case "CodePage437":
return charmap.CodePage437
case "CodePage850":
return charmap.CodePage850
case "CodePage852":
return charmap.CodePage852
case "CodePage855":
return charmap.CodePage855
case "CodePage858":
return charmap.CodePage858
case "CodePage860":
return charmap.CodePage860
case "CodePage862":
return charmap.CodePage862
case "CodePage863":
return charmap.CodePage863
case "CodePage865":
return charmap.CodePage865
case "CodePage866":
return charmap.CodePage866
case "CodePage1047":
return charmap.CodePage1047
case "CodePage1140":
return charmap.CodePage1140
case "ISO8859_1":
return charmap.ISO8859_1
case "ISO8859_2":
return charmap.ISO8859_2
case "ISO8859_3":
return charmap.ISO8859_3
case "ISO8859_4":
return charmap.ISO8859_4
case "ISO8859_5":
return charmap.ISO8859_5
case "ISO8859_6":
return charmap.ISO8859_6
case "ISO8859_6E":
return charmap.ISO8859_6E
case "ISO8859_6I":
return charmap.ISO8859_6I
case "ISO8859_7":
return charmap.ISO8859_7
case "ISO8859_8":
return charmap.ISO8859_8
case "ISO8859_8E":
return charmap.ISO8859_8E
case "ISO8859_8I":
return charmap.ISO8859_8I
case "ISO8859_9":
return charmap.ISO8859_9
case "ISO8859_10":
return charmap.ISO8859_10
case "ISO8859_13":
return charmap.ISO8859_13
case "ISO8859_14":
return charmap.ISO8859_14
case "ISO8859_15":
return charmap.ISO8859_15
case "ISO8859_16":
return charmap.ISO8859_16
case "KOI8R":
return charmap.KOI8R
case "KOI8U":
return charmap.KOI8U
case "Macintosh":
return charmap.Macintosh
case "MacintoshCyrillic":
return charmap.MacintoshCyrillic
case "Windows874":
return charmap.Windows874
case "Windows1250":
return charmap.Windows1250
case "Windows1251":
return charmap.Windows1251
case "Windows1252":
return charmap.Windows1252
case "Windows1253":
return charmap.Windows1253
case "Windows1254":
return charmap.Windows1254
case "Windows1255":
return charmap.Windows1255
case "Windows1256":
return charmap.Windows1256
case "Windows1257":
return charmap.Windows1257
case "Windows1258":
return charmap.Windows1258
case "XUserDefined":
return charmap.XUserDefined
default:
return nil
}
}
type toStrEncodingOpts struct {
Encoding string
}
interp.RegisterFunc1("_to_strencoding", func(_ *interp.Interp, c string, opts toStrEncodingOpts) any {
h := strEncoding(opts.Encoding)
if h == nil {
return fmt.Errorf("unknown string encoding %s", opts.Encoding)
}
bb := &bytes.Buffer{}
if _, err := io.Copy(h.NewEncoder().Writer(bb), strings.NewReader(c)); err != nil {
return err
}
outBR := bitio.NewBitReader(bb.Bytes(), -1)
bin, err := interp.NewBinaryFromBitReader(outBR, 8, 0)
if err != nil {
return err
}
return bin
})
type fromStrEncodingOpts struct {
Encoding string
}
interp.RegisterFunc1("_from_strencoding", func(_ *interp.Interp, c any, opts fromStrEncodingOpts) any {
inBR, err := interp.ToBitReader(c)
if err != nil {
return err
}
h := strEncoding(opts.Encoding)
if h == nil {
return fmt.Errorf("unknown string encoding %s", opts.Encoding)
}
bb := &bytes.Buffer{}
if _, err := io.Copy(bb, h.NewDecoder().Reader(bitio.NewIOReader(inBR))); err != nil {
return err
}
return bb.String()
})
interp.RegisterFS(textFS)
}
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