go stringrange 源码
golang stringrange 代码
文件路径：/test/stringrange.go
// run
// Copyright 2009 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.
// Test range over strings.
package main
import (
"fmt"
"os"
"unicode/utf8"
)
func main() {
s := "\000\123\x00\xca\xFE\u0123\ubabe\U0000babe\U0010FFFFx"
expect := []rune{0, 0123, 0, 0xFFFD, 0xFFFD, 0x123, 0xbabe, 0xbabe, 0x10FFFF, 'x'}
offset := 0
var i int
var c rune
ok := true
cnum := 0
for i, c = range s {
r, size := utf8.DecodeRuneInString(s[i:len(s)]) // check it another way
if i != offset {
fmt.Printf("unexpected offset %d not %d\n", i, offset)
ok = false
}
if r != expect[cnum] {
fmt.Printf("unexpected rune %d from DecodeRuneInString: %x not %x\n", i, r, expect[cnum])
ok = false
}
if c != expect[cnum] {
fmt.Printf("unexpected rune %d from range: %x not %x\n", i, r, expect[cnum])
ok = false
}
offset += size
cnum++
}
if i != len(s)-1 {
fmt.Println("after loop i is", i, "not", len(s)-1)
ok = false
}
i = 12345
c = 23456
for i, c = range "" {
}
if i != 12345 {
fmt.Println("range empty string assigned to index:", i)
ok = false
}
if c != 23456 {
fmt.Println("range empty string assigned to value:", c)
ok = false
}
for _, c := range "a\xed\xa0\x80a" {
if c != 'a' && c != utf8.RuneError {
fmt.Printf("surrogate UTF-8 does not error: %U\n", c)
ok = false
}
}
if !ok {
fmt.Println("BUG: stringrange")
os.Exit(1)
}
}
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