Re: [Caml-list] scanf question

["Milan Stanojević" <milanst@gmail.com>]

Sorry for the delay, I just created the issue.
http://caml.inria.fr/mantis/view.php?id=6791

Benoit, can you attach your patch there?

On Sat, Feb 21, 2015 at 3:08 PM, Benoit Vaugon <benoit.vaugon@gmail.com> wrote:
> Oups, I confirm it is a bug appearing when we have separated formatting_gen
> to formatting_lit in the implementation of formats to handle Format
> constructions like "@{<%s>" and "@[<hov %d>" that collides with scanf
> constructions like "%s@{" and "%s@[". I attach a patch (+ 6 lines) that fix
> the problem, if somebody have time to integrate it...
>
> Sorry.
> Benoît.
>
>
>
> Le 21/02/2015 10:55, Gabriel Scherer a écrit :
>
> This seems to be a regression caused by the reimplementation of format
> strings in 4.02; some "stop after this character" indications are supported,
> but some other fail (when they correspond to valid Format specifications).
> Would you mind opening a but report ( http://caml.inria.fr/mantis/ )?
>
> On Fri, Feb 20, 2015 at 8:28 PM, Milan Stanojević <milanst@gmail.com> wrote:
>>
>> I want to parse a bash like sequence string, for example
>> "some-thing{1..20}", and extract the string before first { and then
>> two numbers inside.
>>
>> I tried this first
>> utop # Scanf.sscanf "some-thing{1..3}" "%s{%d..%d}" (fun s n1 n2 ->
>> s,n1,n2);;
>> Exception: End_of_file.
>>
>> Then I realized %s is special and needs scanning indication (character @).
>>
>> So I tried that but I get the same error
>> utop # Scanf.sscanf "some-thing{1..3}" "%s@{%d..%d}" (fun s n1 n2 ->
>> s,n1,n2);;
>> Exception: End_of_file.
>>
>> But if I use some other character as end of string indication then it
>> works.
>> utop # Scanf.sscanf "some-thingI{1..3}" "%s@I{%d..%d}" (fun s n1 n2 ->
>> s,n1,n2);;
>> - : bytes * int * int = ("some-thing", 1, 3)
>>
>> It seems '{' is somehow special but I can't find anything in the docs
>> about this.
>> Can someone explain what is going on here?
>>
>> Thanks!
>>
>>
>> p.s. At the end I solved my thing by using a range
>>
>> utop # Scanf.sscanf "some-thing{1..3}" "%[a-z-]{%d..%d}" (fun s n1 n2
>> -> s,n1,n2);;
>> - : bytes * int * int = ("some-thing", 1, 3)
>>
>> --
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>
>
>