mirror of
https://github.com/golang/go
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c48b77b1b5
Surrogate halves are part of UTF-16 and should never appear in UTF-8.
(The rune that two combined halves represent in UTF-16 should
be encoded directly.)
Encoding: encode as RuneError.
Decoding: convert to RuneError, consume one byte.
This requires changing:
package unicode/utf8
runtime for range over string
Also added utf8.ValidRune and fixed bug in utf.RuneLen.
Fixes #3927.
R=golang-dev, rsc, bsiegert
CC=golang-dev
https://golang.org/cl/6458099
72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
// run
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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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// Test range over strings.
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package main
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import (
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"fmt"
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"os"
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"unicode/utf8"
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)
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func main() {
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s := "\000\123\x00\xca\xFE\u0123\ubabe\U0000babe\U0010FFFFx"
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expect := []rune{0, 0123, 0, 0xFFFD, 0xFFFD, 0x123, 0xbabe, 0xbabe, 0x10FFFF, 'x'}
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offset := 0
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var i int
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var c rune
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ok := true
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cnum := 0
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for i, c = range s {
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r, size := utf8.DecodeRuneInString(s[i:len(s)]) // check it another way
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if i != offset {
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fmt.Printf("unexpected offset %d not %d\n", i, offset)
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ok = false
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}
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if r != expect[cnum] {
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fmt.Printf("unexpected rune %d from DecodeRuneInString: %x not %x\n", i, r, expect[cnum])
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ok = false
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}
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if c != expect[cnum] {
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fmt.Printf("unexpected rune %d from range: %x not %x\n", i, r, expect[cnum])
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ok = false
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}
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offset += size
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cnum++
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}
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if i != len(s)-1 {
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fmt.Println("after loop i is", i, "not", len(s)-1)
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ok = false
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}
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i = 12345
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c = 23456
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for i, c = range "" {
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}
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if i != 12345 {
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fmt.Println("range empty string assigned to index:", i)
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ok = false
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}
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if c != 23456 {
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fmt.Println("range empty string assigned to value:", c)
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ok = false
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}
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for _, c := range "a\xed\xa0\x80a" {
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if c != 'a' && c != utf8.RuneError {
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fmt.Printf("surrogate UTF-8 does not error: %U\n", c)
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ok = false
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}
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}
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if !ok {
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fmt.Println("BUG: stringrange")
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os.Exit(1)
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}
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}
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