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strings: fix encoding of \u0080 in map

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Fix encoding of PAD (U+0080) which has the same value as utf8.RuneSelf
being incorrectly encoded as \x80 in strings.Map due to using <= instead
of a < comparison operator to check one byte encodings for utf8.

Fixes #25242

Change-Id: Ib6c7d1f425a7ba81e431b6d64009e713d94ea3bc
Reviewed-on: https://go-review.googlesource.com/111286
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Martin Möhrmann 2018-05-04 06:54:18 +02:00 committed by Brad Fitzpatrick
parent 98409a44d5
commit 8c62fc0ca3
2 changed files with 25 additions and 2 deletions
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4
src/strings/strings.go
View File

@ -479,7 +479,7 @@ func Map(mapping func(rune) rune, s string) string {
b = make([]byte, len(s)+utf8.UTFMax)
nbytes = copy(b, s[:i])
if r >= 0 {
if r <= utf8.RuneSelf {
if r < utf8.RuneSelf {
b[nbytes] = byte(r)
nbytes++
} else {
@ -509,7 +509,7 @@ func Map(mapping func(rune) rune, s string) string {
r := mapping(c)
// common case
if (0 <= r && r <= utf8.RuneSelf) && nbytes < len(b) {
if (0 <= r && r < utf8.RuneSelf) && nbytes < len(b) {
b[nbytes] = byte(r)
nbytes++
continue

23
src/strings/strings_test.go
View File

@ -528,6 +528,7 @@ var upperTests = []StringTest{
{"longStrinGwitHmixofsmaLLandcAps", "LONGSTRINGWITHMIXOFSMALLANDCAPS"},
{"long\u0250string\u0250with\u0250nonascii\u2C6Fchars", "LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS"},
{"\u0250\u0250\u0250\u0250\u0250", "\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F"}, // grows one byte per char
{"a\u0080\U0010FFFF", "A\u0080\U0010FFFF"}, // test utf8.RuneSelf and utf8.MaxRune
}
var lowerTests = []StringTest{
@ -538,6 +539,7 @@ var lowerTests = []StringTest{
{"longStrinGwitHmixofsmaLLandcAps", "longstringwithmixofsmallandcaps"},
{"LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS", "long\u0250string\u0250with\u0250nonascii\u0250chars"},
{"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", "\u0251\u0251\u0251\u0251\u0251"}, // shrinks one byte per char
{"A\u0080\U0010FFFF", "a\u0080\U0010FFFF"}, // test utf8.RuneSelf and utf8.MaxRune
}
const space = "\t\v\r\f\n\u0085\u00a0\u2000\u3000"
@ -650,6 +652,27 @@ func TestMap(t *testing.T) {
if m != expect {
t.Errorf("replace invalid sequence: expected %q got %q", expect, m)
}
// 8. Check utf8.RuneSelf and utf8.MaxRune encoding
encode := func(r rune) rune {
switch r {
case utf8.RuneSelf:
return unicode.MaxRune
case unicode.MaxRune:
return utf8.RuneSelf
}
return r
}
s := string(utf8.RuneSelf) + string(utf8.MaxRune)
r := string(utf8.MaxRune) + string(utf8.RuneSelf) // reverse of s
m = Map(encode, s)
if m != r {
t.Errorf("encoding not handled correctly: expected %q got %q", r, m)
}
m = Map(encode, r)
if m != s {
t.Errorf("encoding not handled correctly: expected %q got %q", s, m)
}
}
func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) }