lex: including regex definitions from a separate file

lex: including regex definitions from a separate file

[Sam Steingold]

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I have several lexers in the same directory and I want them to share the
regexp definitions.
is there a way to put the regexp definitions in foo.mll and include them
 in bar.mll?
thanks.
Sam.
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Re: [Caml-list] lex: including regex definitions from a separate file

[Richard Jones]

On Mon, Nov 19, 2007 at 03:29:16PM -0500, Sam Steingold wrote:
> I have several lexers in the same directory and I want them to share the
> regexp definitions.
> is there a way to put the regexp definitions in foo.mll and include them
>  in bar.mll?

Probably your best bet is to preprocess bar.mll in a Makefile -- eg.
using cpp or m4 to generate the file from an input 'bar.mll.in'.

Rich.

-- 
Richard Jones
Red Hat

Re: [Caml-list] lex: including regex definitions from a separate file

[Oliver Bandel]

Zitat von Sam Steingold <sds@gnu.org>:

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>
> I have several lexers in the same directory and I want them to share the
> regexp definitions.
> is there a way to put the regexp definitions in foo.mll and include them
>  in bar.mll?
[...]

You can't share the definitions, only the generated scanner-functions
and tables/tokens (but I never looked at these thingas in detail,
I normally only used the scanner functions).


It is possible to have more than one lexer definition
in a ocamllex-file. So, if you not necessarily need
all those seperated files, you can use one *.mll file
and throw in all scanner-definitions.

But be aware on possibly name-problems then,
if some scanner-definitions might have the same name.
As you then have all things in one compilation unit, you can't distinguish
function "token" from another function "token", so you may have to
rename your functions in the scanner.


Ciao,
   Oliver