* [Caml-list] scanf question
@ 2015-02-20 19:28 Milan Stanojević
2015-02-21 9:55 ` Gabriel Scherer
0 siblings, 1 reply; 4+ messages in thread
From: Milan Stanojević @ 2015-02-20 19:28 UTC (permalink / raw)
To: Caml List
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)
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [Caml-list] scanf question 2015-02-20 19:28 [Caml-list] scanf question Milan Stanojević @ 2015-02-21 9:55 ` Gabriel Scherer 2015-02-21 20:08 ` Benoit Vaugon 0 siblings, 1 reply; 4+ messages in thread From: Gabriel Scherer @ 2015-02-21 9:55 UTC (permalink / raw) To: Milan Stanojević; +Cc: Caml List [-- Attachment #1: Type: text/plain, Size: 1728 bytes --] 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) > > -- > Caml-list mailing list. Subscription management and archives: > https://sympa.inria.fr/sympa/arc/caml-list > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > Bug reports: http://caml.inria.fr/bin/caml-bugs > [-- Attachment #2: Type: text/html, Size: 2551 bytes --] ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Caml-list] scanf question 2015-02-21 9:55 ` Gabriel Scherer @ 2015-02-21 20:08 ` Benoit Vaugon 2015-02-23 19:08 ` Milan Stanojević 0 siblings, 1 reply; 4+ messages in thread From: Benoit Vaugon @ 2015-02-21 20:08 UTC (permalink / raw) To: caml-list [-- Attachment #1.1: Type: text/plain, Size: 2272 bytes --] 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 > <mailto: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) > > -- > Caml-list mailing list. Subscription management and archives: > https://sympa.inria.fr/sympa/arc/caml-list > Beginner's list: http://groups.yahoo.com/group/ocaml_beginners > Bug reports: http://caml.inria.fr/bin/caml-bugs > > [-- Attachment #1.2: Type: text/html, Size: 4331 bytes --] [-- Attachment #2: fix-scanf-open-box-tag-patch.diff --] [-- Type: text/x-patch, Size: 983 bytes --] diff -Naur old/stdlib/scanf.ml new/stdlib/scanf.ml --- old/stdlib/scanf.ml 2015-02-21 20:38:02.250636479 +0100 +++ new/stdlib/scanf.ml 2015-02-21 20:53:51.486677851 +0100 @@ -1125,6 +1125,12 @@ let scan width _ ib = scan_string (Some stp) width ib in let str_rest = String_literal (str, rest) in pad_prec_scanf ib str_rest readers pad No_precision scan token_string + | String (pad, Formatting_gen (Open_tag (Format (fmt', _)), rest)) -> + let scan width _ ib = scan_string (Some '{') width ib in + pad_prec_scanf ib (concat_fmt fmt' rest) readers pad No_precision scan token_string + | String (pad, Formatting_gen (Open_box (Format (fmt', _)), rest)) -> + let scan width _ ib = scan_string (Some '[') width ib in + pad_prec_scanf ib (concat_fmt fmt' rest) readers pad No_precision scan token_string | String (pad, rest) -> let scan width _ ib = scan_string None width ib in pad_prec_scanf ib rest readers pad No_precision scan token_string ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Caml-list] scanf question 2015-02-21 20:08 ` Benoit Vaugon @ 2015-02-23 19:08 ` Milan Stanojević 0 siblings, 0 replies; 4+ messages in thread From: Milan Stanojević @ 2015-02-23 19:08 UTC (permalink / raw) To: Benoit Vaugon; +Cc: Caml List 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) >> >> -- >> Caml-list mailing list. Subscription management and archives: >> https://sympa.inria.fr/sympa/arc/caml-list >> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners >> Bug reports: http://caml.inria.fr/bin/caml-bugs > > > ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-02-23 19:10 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-02-20 19:28 [Caml-list] scanf question Milan Stanojević 2015-02-21 9:55 ` Gabriel Scherer 2015-02-21 20:08 ` Benoit Vaugon 2015-02-23 19:08 ` Milan Stanojević
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