mirror of
https://github.com/golang/go
synced 2024-11-21 15:44:44 -07:00
65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
// $G $F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "unicode/utf8"
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func main() {
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var chars [6]rune
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chars[0] = 'a'
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chars[1] = 'b'
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chars[2] = 'c'
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chars[3] = '\u65e5'
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chars[4] = '\u672c'
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chars[5] = '\u8a9e'
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s := ""
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for i := 0; i < 6; i++ {
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s += string(chars[i])
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}
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var l = len(s)
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for w, i, j := 0, 0, 0; i < l; i += w {
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var r rune
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r, w = utf8.DecodeRuneInString(s[i:len(s)])
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if w == 0 {
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panic("zero width in string")
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}
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if r != chars[j] {
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panic("wrong value from string")
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}
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j++
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}
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// encoded as bytes: 'a' 'b' 'c' e6 97 a5 e6 9c ac e8 aa 9e
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const L = 12
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if L != l {
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panic("wrong length constructing array")
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}
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a := make([]byte, L)
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a[0] = 'a'
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a[1] = 'b'
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a[2] = 'c'
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a[3] = 0xe6
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a[4] = 0x97
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a[5] = 0xa5
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a[6] = 0xe6
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a[7] = 0x9c
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a[8] = 0xac
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a[9] = 0xe8
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a[10] = 0xaa
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a[11] = 0x9e
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for w, i, j := 0, 0, 0; i < L; i += w {
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var r rune
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r, w = utf8.DecodeRune(a[i:L])
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if w == 0 {
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panic("zero width in bytes")
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}
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if r != chars[j] {
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panic("wrong value from bytes")
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}
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j++
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}
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}
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