mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-20 11:33:25 +02:00
200 lines
4.5 KiB
Go
200 lines
4.5 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package traditionalchinese
|
|
|
|
import (
|
|
"unicode/utf8"
|
|
|
|
"golang.org/x/text/encoding"
|
|
"golang.org/x/text/encoding/internal"
|
|
"golang.org/x/text/encoding/internal/identifier"
|
|
"golang.org/x/text/transform"
|
|
)
|
|
|
|
// All is a list of all defined encodings in this package.
|
|
var All = []encoding.Encoding{Big5}
|
|
|
|
// Big5 is the Big5 encoding, also known as Code Page 950.
|
|
var Big5 encoding.Encoding = &big5
|
|
|
|
var big5 = internal.Encoding{
|
|
&internal.SimpleEncoding{big5Decoder{}, big5Encoder{}},
|
|
"Big5",
|
|
identifier.Big5,
|
|
}
|
|
|
|
type big5Decoder struct{ transform.NopResetter }
|
|
|
|
func (big5Decoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
|
r, size, s := rune(0), 0, ""
|
|
loop:
|
|
for ; nSrc < len(src); nSrc += size {
|
|
switch c0 := src[nSrc]; {
|
|
case c0 < utf8.RuneSelf:
|
|
r, size = rune(c0), 1
|
|
|
|
case 0x81 <= c0 && c0 < 0xff:
|
|
if nSrc+1 >= len(src) {
|
|
if !atEOF {
|
|
err = transform.ErrShortSrc
|
|
break loop
|
|
}
|
|
r, size = utf8.RuneError, 1
|
|
goto write
|
|
}
|
|
c1 := src[nSrc+1]
|
|
switch {
|
|
case 0x40 <= c1 && c1 < 0x7f:
|
|
c1 -= 0x40
|
|
case 0xa1 <= c1 && c1 < 0xff:
|
|
c1 -= 0x62
|
|
case c1 < 0x40:
|
|
r, size = utf8.RuneError, 1
|
|
goto write
|
|
default:
|
|
r, size = utf8.RuneError, 2
|
|
goto write
|
|
}
|
|
r, size = '\ufffd', 2
|
|
if i := int(c0-0x81)*157 + int(c1); i < len(decode) {
|
|
if 1133 <= i && i < 1167 {
|
|
// The two-rune special cases for LATIN CAPITAL / SMALL E WITH CIRCUMFLEX
|
|
// AND MACRON / CARON are from http://encoding.spec.whatwg.org/#big5
|
|
switch i {
|
|
case 1133:
|
|
s = "\u00CA\u0304"
|
|
goto writeStr
|
|
case 1135:
|
|
s = "\u00CA\u030C"
|
|
goto writeStr
|
|
case 1164:
|
|
s = "\u00EA\u0304"
|
|
goto writeStr
|
|
case 1166:
|
|
s = "\u00EA\u030C"
|
|
goto writeStr
|
|
}
|
|
}
|
|
r = rune(decode[i])
|
|
if r == 0 {
|
|
r = '\ufffd'
|
|
}
|
|
}
|
|
|
|
default:
|
|
r, size = utf8.RuneError, 1
|
|
}
|
|
|
|
write:
|
|
if nDst+utf8.RuneLen(r) > len(dst) {
|
|
err = transform.ErrShortDst
|
|
break loop
|
|
}
|
|
nDst += utf8.EncodeRune(dst[nDst:], r)
|
|
continue loop
|
|
|
|
writeStr:
|
|
if nDst+len(s) > len(dst) {
|
|
err = transform.ErrShortDst
|
|
break loop
|
|
}
|
|
nDst += copy(dst[nDst:], s)
|
|
continue loop
|
|
}
|
|
return nDst, nSrc, err
|
|
}
|
|
|
|
type big5Encoder struct{ transform.NopResetter }
|
|
|
|
func (big5Encoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
|
r, size := rune(0), 0
|
|
for ; nSrc < len(src); nSrc += size {
|
|
r = rune(src[nSrc])
|
|
|
|
// Decode a 1-byte rune.
|
|
if r < utf8.RuneSelf {
|
|
size = 1
|
|
if nDst >= len(dst) {
|
|
err = transform.ErrShortDst
|
|
break
|
|
}
|
|
dst[nDst] = uint8(r)
|
|
nDst++
|
|
continue
|
|
|
|
} else {
|
|
// Decode a multi-byte rune.
|
|
r, size = utf8.DecodeRune(src[nSrc:])
|
|
if size == 1 {
|
|
// All valid runes of size 1 (those below utf8.RuneSelf) were
|
|
// handled above. We have invalid UTF-8 or we haven't seen the
|
|
// full character yet.
|
|
if !atEOF && !utf8.FullRune(src[nSrc:]) {
|
|
err = transform.ErrShortSrc
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
if r >= utf8.RuneSelf {
|
|
// func init checks that the switch covers all tables.
|
|
switch {
|
|
case encode0Low <= r && r < encode0High:
|
|
if r = rune(encode0[r-encode0Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode1Low <= r && r < encode1High:
|
|
if r = rune(encode1[r-encode1Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode2Low <= r && r < encode2High:
|
|
if r = rune(encode2[r-encode2Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode3Low <= r && r < encode3High:
|
|
if r = rune(encode3[r-encode3Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode4Low <= r && r < encode4High:
|
|
if r = rune(encode4[r-encode4Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode5Low <= r && r < encode5High:
|
|
if r = rune(encode5[r-encode5Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode6Low <= r && r < encode6High:
|
|
if r = rune(encode6[r-encode6Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
case encode7Low <= r && r < encode7High:
|
|
if r = rune(encode7[r-encode7Low]); r != 0 {
|
|
goto write2
|
|
}
|
|
}
|
|
err = internal.ErrASCIIReplacement
|
|
break
|
|
}
|
|
|
|
write2:
|
|
if nDst+2 > len(dst) {
|
|
err = transform.ErrShortDst
|
|
break
|
|
}
|
|
dst[nDst+0] = uint8(r >> 8)
|
|
dst[nDst+1] = uint8(r)
|
|
nDst += 2
|
|
continue
|
|
}
|
|
return nDst, nSrc, err
|
|
}
|
|
|
|
func init() {
|
|
// Check that the hard-coded encode switch covers all tables.
|
|
if numEncodeTables != 8 {
|
|
panic("bad numEncodeTables")
|
|
}
|
|
}
|