golang utf16 代码
文件路径：/src/unicode/utf16/utf16.go
/ Copyright 2010 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 utf16 implements encoding and decoding of UTF-16 sequences.
package utf16
/ The conditions replacementChar==unicode.ReplacementChar and
/ maxRune==unicode.MaxRune are verified in the tests.
/ Defining them locally avoids this package depending on package unicode.
const (
replacementChar = '\uFFFD' / Unicode replacement character
maxRune = '\U0010FFFF' / Maximum valid Unicode code point.
)
const (
/ 0xd800-0xdc00 encodes the high 10 bits of a pair.
/ 0xdc00-0xe000 encodes the low 10 bits of a pair.
/ the value is those 20 bits plus 0x10000.
surr1 = 0xd800
surr2 = 0xdc00
surr3 = 0xe000
surrSelf = 0x10000
)
/ IsSurrogate reports whether the specified Unicode code point
/ can appear in a surrogate pair.
func IsSurrogate(r rune) bool {
return surr1 <= r && r < surr3
}
/ DecodeRune returns the UTF-16 decoding of a surrogate pair.
/ If the pair is not a valid UTF-16 surrogate pair, DecodeRune returns
/ the Unicode replacement code point U+FFFD.
func DecodeRune(r1, r2 rune) rune {
if surr1 <= r1 && r1 < surr2 && surr2 <= r2 && r2 < surr3 {
return (r1-surr1)<<10 | (r2 - surr2) + surrSelf
}
return replacementChar
}
/ EncodeRune returns the UTF-16 surrogate pair r1, r2 for the given rune.
/ If the rune is not a valid Unicode code point or does not need encoding,
/ EncodeRune returns U+FFFD, U+FFFD.
func EncodeRune(r rune) (r1, r2 rune) {
if r < surrSelf || r > maxRune {
return replacementChar, replacementChar
}
r -= surrSelf
return surr1 + (r>>10)&0x3ff, surr2 + r&0x3ff
}
/ Encode returns the UTF-16 encoding of the Unicode code point sequence s.
func Encode(s []rune) []uint16 {
n := len(s)
for _, v := range s {
if v >= surrSelf {
n++
}
}
a := make([]uint16, n)
n = 0
for _, v := range s {
switch {
case 0 <= v && v < surr1, surr3 <= v && v < surrSelf:
/ normal rune
a[n] = uint16(v)
n++
case surrSelf <= v && v <= maxRune:
/ needs surrogate sequence
r1, r2 := EncodeRune(v)
a[n] = uint16(r1)
a[n+1] = uint16(r2)
n += 2
default:
a[n] = uint16(replacementChar)
n++
}
}
return a[:n]
}
/ Decode returns the Unicode code point sequence represented
/ by the UTF-16 encoding s.
func Decode(s []uint16) []rune {
a := make([]rune, len(s))
n := 0
for i := 0; i < len(s); i++ {
switch r := s[i]; {
case r < surr1, surr3 <= r:
/ normal rune
a[n] = rune(r)
case surr1 <= r && r < surr2 && i+1 < len(s) &&
surr2 <= s[i+1] && s[i+1] < surr3:
/ valid surrogate sequence
a[n] = DecodeRune(rune(r), rune(s[i+1]))
i++
default:
/ invalid surrogate sequence
a[n] = replacementChar
}
n++
}
return a[:n]
}