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Source file test/stringrange.go

Documentation: test

  // 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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