Using ulex

Using ulex

[Paul Snively]

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Hi folks,

I'm trying to use Alain Frisch's ulex to write a simple .ini file  
lexer. I'm still pretty new to the module system, how libraries work,  
and in particular how camlp4 and syntax extensions work. Here are the  
things I've tried to just get ulex to tell me I'm not being foolish.  
This is with O'Caml 3.08.3 and findlib 1.0.4 on Mac OS X 10.4.1:

- -------------------------------------snip  
snip-------------------------------------
Valhalla:~ psnively$ ocaml
         Objective Caml version 3.08.3

# #load "camlp4o.cma";;
         Camlp4 Parsing version 3.08.3

# #load "/usr/local/lib/ocaml/site-lib/ulex/pa_ulex.cma";;
# #load "/usr/local/lib/ocaml/site-lib/ulex/ulexing.cma";;
# (lexer ("#!" [^ '\n']* "\n")? -> ()) lexbuf;;        (* This is  
from the README *)
Unbound value Ulexing.mark
#
- -------------------------------------snip  
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OK, so maybe I need to "open Ulexing;;":

- -------------------------------------snip  
snip-------------------------------------
# open Ulexing;;
Unbound module Ulexing
#
- -------------------------------------snip  
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I'm working too hard: this is what findlib is for. So, in a fresh ocaml:

- -------------------------------------snip  
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Valhalla:~ psnively$ ocaml
         Objective Caml version 3.08.3

# #use "topfind";;
- - : unit = ()
Findlib has been successfully loaded. Additional directives:
   #require "package";;      to load a package
   #list;;                   to list the available packages
   #camlp4o;;                to load camlp4 (standard syntax)
   #camlp4r;;                to load camlp4 (revised syntax)
   #predicates "p,q,...";;   to set these predicates
   Topfind.reset();;         to force that packages will be reloaded
   #thread;;                 to enable threads

- - : unit = ()
# #camlp4o;;
/usr/local/lib/ocaml/camlp4: added to search path
/usr/local/lib/ocaml/camlp4/camlp4o.cma: loaded
         Camlp4 Parsing version 3.08.3

# #require "ulex";;
/usr/local/lib/ocaml/site-lib/ulex: added to search path
/usr/local/lib/ocaml/site-lib/ulex/pa_ulex.cma: loaded
/usr/local/lib/ocaml/site-lib/ulex/ulexing.cma: loaded
# (lexer ("#!" [^ '\n']* "\n")? -> ()) lexbuf;;
Unbound value __ulex_partition_0
#
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I confess to being stumped. Any advice would be most welcome.

Best regards,
Paul Snively

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Re: [Caml-list] Using ulex

[Alain Frisch]

Paul Snively wrote:
> I'm trying to use Alain Frisch's ulex to write a simple .ini file 
> lexer. I'm still pretty new to the module system, how libraries work, 
> and in particular how camlp4 and syntax extensions work. Here are the 
> things I've tried to just get ulex to tell me I'm not being foolish. 
> This is with O'Caml 3.08.3 and findlib 1.0.4 on Mac OS X 10.4.1:

Ulex is not designed to work in the toplevel. (Technical reason: it adds
 some declarations at the beginning of the compilation unit.)

-- Alain

Re: [Caml-list] Using ulex

[Paul Snively]

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Hi Alain!

On Jul 3, 2005, at 2:32 PM, Alain Frisch wrote:

> Ulex is not designed to work in the toplevel. (Technical reason: it  
> adds
>  some declarations at the beginning of the compilation unit.)
>
Oh, that's a shame; I'm quite spoiled by the general ability to test  
things out interactively before committing them to a batch compile.  
Still, I did "make view_test" and "make run_test" in the distribution  
directory, and that clarifies what's going on quite nicely. Thanks  
for the prompt reply!

> -- Alain
>
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Best regards,
Paul Snively

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