[Caml-list] # eval line; (?)

[Caml-list] # eval line; (?)

[Coletta Rémi]

Hello,

# line;;
- : string = "let b = 1;;"

# b;;
  ^
Unbound value b

I'm looking for a function like "eval" in LISP, that does

# eval line;
-: int = 1

#b;;
- : int = 1

Thanks,

-- 
Remi COLETTA
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Re: [Caml-list] # eval line; (?)

[Warp]

> Hello,
>
> # line;;
> - : string = "let b = 1;;"
>
> # b;;
>   ^
> Unbound value b
>
> I'm looking for a function like "eval" in LISP, that does

This function does NOT exists, for many reasons ( including security and
typing ).

Nicolas Cannasse

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Re: [Caml-list] # eval line; (?)

[Sami Mäkelä]

> # line;;
> - : string = "let b = 1;;"
> 
> # b;;
>   ^
> Unbound value b
> 
> I'm looking for a function like "eval" in LISP, that does
> 
> # eval line;
> -: int = 1
> 
> #b;;
> - : int = 1

Try:

let eval str =
  Toploop.execute_phrase true Format.std_formatter
     (!Toploop.parse_toplevel_phrase (Lexing.from_string str));;
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Re: [Caml-list] # eval line; (?)

[Chris Hecker]

 > Try:
>let eval str =
>   Toploop.execute_phrase true Format.std_formatter
>      (!Toploop.parse_toplevel_phrase (Lexing.from_string str));;

I think he wants the variable to be bound into the current toplevel 
environment, which this doesn't do:

# b;;
Characters 0-1:
Unbound value b


# let eval str =
   Toploop.execute_phrase true Format.std_formatter
      (!Toploop.parse_toplevel_phrase (Lexing.from_string str));;
val eval : string -> bool = <fun>

# eval "let b = 1;;";;
val b : int = 1
- : bool = true

# b;;
Characters 0-1:
Unbound value b

# eval "b;;";;
Uncaught exception: Typecore.Error(_, _).


Unless I made a mistaken assumption?

I don't think there's any way to bind it into the current toplevel, but 
maybe you could dynamically load a module or hack something with #use or 
something.  I'm using 3.01 still, so maybe this is different on 3.04.

Chris


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Re: [Caml-list] # eval line; (?)

[Sami Mäkelä]

> 
> Unless I made a mistaken assumption?
> 
> I don't think there's any way to bind it into the current toplevel, but
> maybe you could dynamically load a module or hack something with #use or
> something.  I'm using 3.01 still, so maybe this is different on 3.04.

It works here, I'm using 3.04.
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RE: [Caml-list] # eval line; (?)

[Gurr, David (MED, self)]

I think that there is a small catch.  I think that the definition of 
eval is correct, but that if you use it in a toplevel loop, then it
will fail because of the parser not reenterant. -D

> -----Original Message-----
> From: Sami Mäkelä [mailto:sajuma@utu.fi]
> Sent: Thursday, May 09, 2002 12:23 PM
> To: Coletta Rémi
> Cc: caml-list@inria.fr
> Subject: Re: [Caml-list] # eval line; (?)
> 
> 
> > # line;;
> > - : string = "let b = 1;;"
> > 
> > # b;;
> >   ^
> > Unbound value b
> > 
> > I'm looking for a function like "eval" in LISP, that does
> > 
> > # eval line;
> > -: int = 1
> > 
> > #b;;
> > - : int = 1
> 
> Try:
> 
> let eval str =
>   Toploop.execute_phrase true Format.std_formatter
>      (!Toploop.parse_toplevel_phrase (Lexing.from_string str));;
> -------------------
> To unsubscribe, mail caml-list-request@inria.fr Archives: 
> http://caml.inria.fr
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http://caml.inria.fr/FAQ/
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Re: [Caml-list] # eval line; (?)

[Coletta Rémi]

On Fri, 10 May 2002 15:39:50 -0500
"Gurr, David (MED, self)" <David.Gurr@med.ge.com> wrote:

>
>I think that there is a small catch.  I think that the definition of 
>eval is correct, but that if you use it in a toplevel loop, then it
>will fail because of the parser not reenterant. -D
>

Exactly,
  But i don't know if someone has post a solution (because the archive page
http://caml.inria.fr/archives/200205/threads.html  look's like not to be refresh :-( 

I've got 2 process: 
  - the first one write into a fffo expression like  "{tab = [| 1;1 |]; valeur = false}" 
  - the second one has to read this expression...

I think this can be do by a "hand-made parser" but an "Lisp-like" "eval" were
a good idea.
 
PS: please, excuse my english speaking :-(
 
-- 
Remi COLETTA
www.coletta.free.fr

     .-.  
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    // \\    POWERED
   /(   )\  
    ^^-^^      
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