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strconv: rely on utf8.AppendRune

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This is both simpler and more performant.

Quote             268ns ± 5%   258ns ± 4%  -3.70%  (p=0.014 n=10+10)
QuoteRune        28.9ns ± 3%  28.4ns ± 4%    ~     (p=0.113 n=9+10)
AppendQuote       165ns ± 3%   165ns ± 3%    ~     (p=0.661 n=9+10)
AppendQuoteRune  8.05ns ± 5%  7.75ns ± 7%    ~     (p=0.065 n=10+9)

Change-Id: Ib0ee332e970d4986026c05e5e0e368f41eff7977
Reviewed-on: https://go-review.googlesource.com/c/go/+/412338
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Robert Griesemer <gri@google.com>
This commit is contained in:
Joe Tsai 2022-06-15 17:39:59 -07:00 committed by Joseph Tsai
parent 1c00354013
commit 2fcfdb9686
1 changed files with 2 additions and 7 deletions
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9
src/strconv/quote.go
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@ -66,7 +66,6 @@ func appendQuotedRuneWith(buf []byte, r rune, quote byte, ASCIIonly, graphicOnly
}
func appendEscapedRune(buf []byte, r rune, quote byte, ASCIIonly, graphicOnly bool) []byte {
var runeTmp [utf8.UTFMax]byte
if r == rune(quote) || r == '\\' { // always backslashed
buf = append(buf, '\\')
buf = append(buf, byte(r))
@ -78,9 +77,7 @@ func appendEscapedRune(buf []byte, r rune, quote byte, ASCIIonly, graphicOnly bo
return buf
}
} else if IsPrint(r) || graphicOnly && isInGraphicList(r) {
n := utf8.EncodeRune(runeTmp[:], r)
buf = append(buf, runeTmp[:n]...)
return buf
return utf8.AppendRune(buf, r)
}
switch r {
case '\a':
@ -471,9 +468,7 @@ func unquote(in string, unescape bool) (out, rem string, err error) {
if r < utf8.RuneSelf || !multibyte {
buf = append(buf, byte(r))
} else {
var arr [utf8.UTFMax]byte
n := utf8.EncodeRune(arr[:], r)
buf = append(buf, arr[:n]...)
buf = utf8.AppendRune(buf, r)
}
}