[Caml-list] pattern matching on integer intervals

[Caml-list] pattern matching on integer intervals

[Pierre Chopin]

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Hi,

I am trying to do pattern matching on unicode characters, represented by
integers. I would like to do something like that

 let f c =
 match c with
   0xff .. 0xfff -> foo

I know we can pattern match over char intervals but It doesn't be to be the
case for char intervals. Some I have two questions:
 Is there a better way of doing what I am doing and why is it possible to
pattern match over char intervals and not int intervals?

-- 
Pierre Chopin,
Chief Technology Officer and co-founder
punchup LLC
pierre@punchup.com

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Re: [Caml-list] pattern matching on integer intervals

[Till Varoquaux]

I remember wondering the same thing and the answer can be found in the
ocaml parser: char intervals are expanded at parse time to the the
full list of characters. This would blow up if you were to use ints,
int64 etc....

HTH,
Till

On Sat, Jan 21, 2012 at 1:14 PM, Pierre Chopin <pierre@punchup.com> wrote:
> Hi,
>
> I am trying to do pattern matching on unicode characters, represented by
> integers. I would like to do something like that
>
>  let f c =
>  match c with
>    0xff .. 0xfff -> foo
>
> I know we can pattern match over char intervals but It doesn't be to be the
> case for char intervals. Some I have two questions:
>  Is there a better way of doing what I am doing and why is it possible to
> pattern match over char intervals and not int intervals?
>
> --
> Pierre Chopin,
> Chief Technology Officer and co-founder
> punchup LLC
> pierre@punchup.com
>

Re: [Caml-list] pattern matching on integer intervals

[Gabriel Scherer]

I believe your best bet is the 'if .. then .. else' chain. You may
also use 'when' clauses in pattern matching, but those don't scale too
well and are best avoided if their are the only content of your
content: pattern matching are good for structural deconstruction and
environment binding, but can be confusing and useless when you are
using none of those aspects.

On Sat, Jan 21, 2012 at 7:14 PM, Pierre Chopin <pierre@punchup.com> wrote:
> Hi,
>
> I am trying to do pattern matching on unicode characters, represented by
> integers. I would like to do something like that
>
>  let f c =
>  match c with
>    0xff .. 0xfff -> foo
>
> I know we can pattern match over char intervals but It doesn't be to be the
> case for char intervals. Some I have two questions:
>  Is there a better way of doing what I am doing and why is it possible to
> pattern match over char intervals and not int intervals?
>
> --
> Pierre Chopin,
> Chief Technology Officer and co-founder
> punchup LLC
> pierre@punchup.com
>

Re: [Caml-list] pattern matching on integer intervals

[Edgar Friendly]

On 01/21/2012 01:14 PM, Pierre Chopin wrote:
> Hi,
>
> I am trying to do pattern matching on unicode characters, represented by
> integers. I would like to do something like that
>
>   let f c =
>   match c with
>     0xff .. 0xfff -> foo
>
> I know we can pattern match over char intervals but It doesn't be to be
> the case for char intervals. Some I have two questions:
>   Is there a better way of doing what I am doing and why is it possible
> to pattern match over char intervals and not int intervals?

The author of Camomile wrote IMap and ISet to efficiently store 
maps/sets over a large domain where large ranges are the same.  You may 
be able to use these DIET trees from camomile or from batteries to 
accomplish something along the lines of what you want.

E.