go stringrange 源码

  • 2022-07-15
  • 浏览 (861)

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)
	}
}

相关信息

go 源码目录

相关文章

go 235 源码

go 64bit 源码

go alg 源码

go alias 源码

go alias1 源码

go alias2 源码

go alias3 源码

go align 源码

go append 源码

go append1 源码

0  赞