gcc/testsuite/go.test/test/utf.go

   1 // $G $F.go && $L $F.$A && ./$A.out
   2
   3 // Copyright 2009 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 package main
   8
   9 import "utf8"
  10
  11 func main() {
  12         var chars [6] int
  13         chars[0] = 'a'
  14         chars[1] = 'b'
  15         chars[2] = 'c'
  16         chars[3] = '\u65e5'
  17         chars[4] = '\u672c'
  18         chars[5] = '\u8a9e'
  19         s := ""
  20         for i := 0; i < 6; i++ {
  21                 s += string(chars[i])
  22         }
  23         var l = len(s)
  24         for w, i, j := 0,0,0; i < l; i += w {
  25                 var r int
  26                 r, w = utf8.DecodeRuneInString(s[i:len(s)])
  27                 if w == 0 { panic("zero width in string") }
  28                 if r != chars[j] { panic("wrong value from string") }
  29                 j++
  30         }
  31         // encoded as bytes:  'a' 'b' 'c' e6 97 a5 e6 9c ac e8 aa 9e
  32         const L = 12
  33         if L != l { panic("wrong length constructing array") }
  34         a := make([]byte, L)
  35         a[0] = 'a'
  36         a[1] = 'b'
  37         a[2] = 'c'
  38         a[3] = 0xe6
  39         a[4] = 0x97
  40         a[5] = 0xa5
  41         a[6] = 0xe6
  42         a[7] = 0x9c
  43         a[8] = 0xac
  44         a[9] = 0xe8
  45         a[10] = 0xaa
  46         a[11] = 0x9e
  47         for w, i, j := 0,0,0; i < L; i += w {
  48                 var r int
  49                 r, w = utf8.DecodeRune(a[i:L])
  50                 if w == 0 { panic("zero width in bytes") }
  51                 if r != chars[j] { panic("wrong value from bytes") }
  52                 j++
  53         }
  54 }