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strings: rely on utf8.AppendRune

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This is both simpler and more performant.

Change-Id: I66ef8e49c059a722932392ee3ecfb951d9b8e121
Reviewed-on: https://go-review.googlesource.com/c/go/+/412339
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Joe Tsai 2022-06-15 17:50:04 -07:00 • committed by Gopher Robot
parent e7f2e5697a
commit 723a27994d
1 changed files with 3 additions and 12 deletions
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15
src/strings/builder.go
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@ -103,18 +103,9 @@ func (b *Builder) WriteByte(c byte) error {
// It returns the length of r and a nil error.
func (b *Builder) WriteRune(r rune) (int, error) {
b.copyCheck()
// Compare as uint32 to correctly handle negative runes.
if uint32(r) < utf8.RuneSelf {
b.buf = append(b.buf, byte(r))
return 1, nil
}
l := len(b.buf)
if cap(b.buf)-l < utf8.UTFMax {
b.grow(utf8.UTFMax)
}
n := utf8.EncodeRune(b.buf[l:l+utf8.UTFMax], r)
b.buf = b.buf[:l+n]
return n, nil
n := len(b.buf)
b.buf = utf8.AppendRune(b.buf, r)
return len(b.buf) - n, nil
}
// WriteString appends the contents of s to b's buffer.