[Caml-list] [repost] Request for more String functions

[Caml-list] [repost] Request for more String functions

[Richard Jones]

To: caml-list@inria.fr
Subject: Request for more String functions

It's great that the String module in 3.07 has a String.iter function.

What would also be really useful would be:

- String.iteri
- String.map
- String.mapi
- String.fold_left
- String.fold_right

Another difficulty I find is doing search and replace on strings, in
simple cases where the overhead of a regular expression probably isn't
warranted.  For example, escaping all '<' characters in a string with
'&lt;'.  It would be nice to have a Search.char_replace function to do
this.

Rich.

----- End forwarded message -----

-- 
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
Perl4Caml lets you use any Perl library in your type-safe Objective
CAML programs. http://www.merjis.com/developers/perl4caml/

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Re: [Caml-list] [repost] Request for more String functions

[Dustin Sallings]

On Feb 20, 2004, at 9:28, Richard Jones wrote:

> Another difficulty I find is doing search and replace on strings, in
> simple cases where the overhead of a regular expression probably isn't
> warranted.  For example, escaping all '<' characters in a string with
> '&lt;'.  It would be nice to have a Search.char_replace function to do
> this.

	I ran into problems with just plain search first.  My programs are 4x 
faster with plain splits and searches than regex.  Here's some of the 
stuff I've added:

val split : string -> char -> int -> string list
val split_chars : string -> char list -> int -> string list
val strstr : string -> string -> int -> int
val ends_with : string -> string -> bool
val begins_with : string -> string -> bool
val string_of_chars : char list -> string

-- 
Dustin Sallings

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Re: [Caml-list] [repost] Request for more String functions

[Richard Jones]

On Fri, Feb 20, 2004 at 11:34:39AM -0800, Dustin Sallings wrote:
> val split : string -> char -> int -> string list
> val split_chars : string -> char list -> int -> string list
> val strstr : string -> string -> int -> int
> val ends_with : string -> string -> bool
> val begins_with : string -> string -> bool
> val string_of_chars : char list -> string

Yes, ends_with and begins_with - I keep copying those functions from
file to file.  It'd be great to have them in the std lib.

Along with:

List.truncate    - returns the first N elements of a list
String.truncate  - truncate a string to a given length
List.group_by    - http://groups.yahoo.com/group/ocaml_beginners/message/1556

range : int -> int -> int list    - produces a list of numbers from a to b

let (//) = Filename.concat

Rich.

-- 
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
MOD_CAML lets you run type-safe Objective CAML programs inside the Apache
webserver. http://www.merjis.com/developers/mod_caml/

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Re: [Caml-list] [repost] Request for more String functions

[Shawn Wagner]

On Fri, Feb 20, 2004 at 07:44:49PM +0000, Richard Jones wrote:
> On Fri, Feb 20, 2004 at 11:34:39AM -0800, Dustin Sallings wrote:
> > val split : string -> char -> int -> string list
> > val split_chars : string -> char list -> int -> string list
> > val strstr : string -> string -> int -> int
> > val ends_with : string -> string -> bool
> > val begins_with : string -> string -> bool
> > val string_of_chars : char list -> string
> 
> Yes, ends_with and begins_with - I keep copying those functions from
> file to file.  It'd be great to have them in the std lib.

<Plug> Many of these (And everything the OP asked for, though I had to add
some of them just now) are in my extlib library
(http://raevnos.pennmush.org/code/extlib/), though under different names.
It's a collection of things that would be useful in the standard libraries
that come with ocaml, but aren't there. I keep adding to it all the time
(Also just added the getpgid/setpgid functions also just requested on the
list).

> 
> Along with:
> 

> String.truncate  - truncate a string to a given length

This one's in it too.

</Plug>

-- 
Shawn Wagner
shawnw@speakeasy.org

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Re: [Caml-list] [repost] Request for more String functions

[William D. Neumann]

On Fri, 20 Feb 2004, Richard Jones wrote:

> String.truncate  - truncate a string to a given length

I call my version procrustes, because it will also pad a string that is
too short with an optional padding character (defaults to ' ').  In any case,
it would be great to see some of these functions added to the standard
library so I wouldn't have to tote around my Wdn module...

William D. Neumann

---

"Well I could be a genius, if I just put my mind to it.
And I...I could do anything, if only I could get 'round to it.
Oh we were brought up on the space-race, now they expect you to clean toilets.
When you've seen how big the world is, how can you make do with this?
If you want me, I'll be sleeping in - sleeping in throughout these glory days."

	-- Jarvis Cocker

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Re: [Caml-list] [repost] Request for more String functions

[David Fox]

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William D. Neumann wrote:

>On Fri, 20 Feb 2004, Richard Jones wrote:
>
>  
>
>>String.truncate  - truncate a string to a given length
>>    
>>
>
>I call my version procrustes, because it will also pad a string that is
>too short with an optional padding character (defaults to ' ').  In any case,
>it would be great to see some of these functions added to the standard
>library so I wouldn't have to tote around my Wdn module...
>  
>
The Scheme standard calls these functions "take" (take the first n 
elements) and
"drop" (drop the first n elements.)  I don't think it padded them.

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Re: [Caml-list] [repost] Request for more String functions

[ChoJin]

Shawn Wagner <shawnw@speakeasy.org> writes:

> On Fri, Feb 20, 2004 at 07:44:49PM +0000, Richard Jones wrote:
>> On Fri, Feb 20, 2004 at 11:34:39AM -0800, Dustin Sallings wrote:
>> > val split : string -> char -> int -> string list
>> > val split_chars : string -> char list -> int -> string list
>> > val strstr : string -> string -> int -> int
>> > val ends_with : string -> string -> bool
>> > val begins_with : string -> string -> bool
>> > val string_of_chars : char list -> string
>> 
>> Yes, ends_with and begins_with - I keep copying those functions from
>> file to file.  It'd be great to have them in the std lib.
>
> <Plug> Many of these (And everything the OP asked for, though I had to add
> some of them just now) are in my extlib library
> (http://raevnos.pennmush.org/code/extlib/), though under different names.
> It's a collection of things that would be useful in the standard libraries
> that come with ocaml, but aren't there. I keep adding to it all the time
> (Also just added the getpgid/setpgid functions also just requested on the
> list).

I'm a beginner in ocaml, but from time to time I have to convert a
char to a string. And I was surprised when I couldn't find
"string_of_char".

Is there a better way than String.make 1 my_char ?

-- 
Best Regards
ChoJin

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