Thanks for confirming. I wrote that function and erased a good bit of the
overhead.
bytes.Buffer for the no-escapes path and strconv.Quote otherwise.
On Wed, Oct 13, 2021, 8:49 PM Ian Lance Taylor <i...@golang.org> wrote:
> On Wed, Oct 13, 2021 at 3:46 PM 'Tim Hockin' via golang-nuts
> <golang-nuts@googlegroups.com> wrote:
> >
> > Is there any ready-built function that can tell me whether
> `strconv.Quote()` would produce a different string than its input, without
> actually running it? Or is there a clearly documented set of rules one
> could use to test each rune in a string?
> >
> > I am trying to avoid allocations, and MOST of the inputs will be safe
> (but not all). Calling strconv.Quote() has a measurable impact, so I'd
> avoid it if I could...
> >
> > Does such an animal exist?
>
> To answer your exact question, strconv.Quote always allocates a new
> string, because it always adds quotation marks around the returned
> string. That is, the output of strconv.Quote("a") is `"a"`, with
> literal quotation characters.
>
> Other than calling strconv.Quote will replace any rune for which
> strconv.IsPrint returns false, and it will also replace `\` and `"`.
> But I don't think there is a function to check that.
>
> Ian
>
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