"\x7f"

[Gustavo Niemeyer]

Is there a reason for fmt to display "\x7f" as "\x007f" in quoted strings?

http://play.golang.org/p/0sT5R-DDqN


gustavo @ http://niemeyer.net

[Gustavo Niemeyer]

On Wed, Jun 26, 2013 at 3:25 PM, Gustavo Niemeyer <gus...@niemeyer.net> wrote:
> Is there a reason for fmt to display "\x7f" as "\x007f" in quoted strings?

Sorry, I meant "\u007f".


gustavo @ http://niemeyer.net

[Rob Pike]

It's strconv, not fmt that's doing this.

http://play.golang.org/p/awxg5_ib5A

Not that that's an answer.

-rob

[Jeremy Wall]

\x7f is the same as \u007f and the fmt package doesn't know which format you wrote it in so how should it choose in that situation? Any choice will be somewhat arbitrary.

gustavo @ http://niemeyer.net

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[Rob Pike]

The real answer: strconv.Quote uses \x only for characters less than
space. I'm sure the design has some history that ends at an arbitrary
decision in the infinite past.

I can't get excited about changing it; plus it's arguably an API change.

-rob

[Gustavo Niemeyer]

On Wed, Jun 26, 2013 at 3:35 PM, Rob Pike <r...@golang.org> wrote:
> The real answer: strconv.Quote uses \x only for characters less than
> space.

It's a bit more involved: http://play.golang.org/p/sZ26RCvncQ

> I'm sure the design has some history that ends at an arbitrary
> decision in the infinite past.
>
> I can't get excited about changing it; plus it's arguably an API change.

I wouldn't take that as an API change, but it's not exactly exciting
either. Just seems arbitrary.


gustavo @ http://niemeyer.net

[Rob Pike]

It is arbitrary. Why do you care? That implies a non-arbitrary thought process.

-rob

[Gustavo Niemeyer]

On Wed, Jun 26, 2013 at 4:08 PM, Rob Pike <r...@golang.org> wrote:
> It is arbitrary. Why do you care? That implies a non-arbitrary thought process.

Even if I agree, my brain tends to appreciate non-arbitrariness for
whatever reason. If I feed it things that look alike, it tends to spot
their meaning more quickly.


gustavo @ http://niemeyer.net

[Zachary Collier]

9 years in the future:

This is why I cared: https://go.dev/play/p/F4GlQBQL7UC

It's the only ASCII character showing as Unicode. When testing, I was alarmed thinking I had an error, but it was inaccurately represented as Unicode.  

The length is accurate.  

  fmt.Printf("Byte 127 len: %d\n", len([]byte{127}))

[peterGo]

Unicode Standard

http://www.unicode.org/versions/latest/

C0 Controls and Basic Latin Range: 0000–007F

https://unicode.org/charts/PDF/U0000.pdf

Control character 007F  = DELETE

Peter

[Rob Pike]

It's odd, and the oddness comes from the strconv package. But it's not
incorrect.

It happens because \x7f is kinda sort not ASCII, at least as far as
strconv thinks. It's trivial to "fix", though, if a fix is necessary.

https://github.com/golang/go/issues/52062

-rob

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