challenge [was: unfolding header lines]

[David Relson]

Michael,

By jove, I think you've got it :-)  Now to transfer the changes to
lexer_v3.l and lexer.c which is the "real" code and see what happens.

David

On 05 Sep 2003 12:05:53 +1000
michael at optusnet.com.au wrote:

> David Relson <relson at osagesoftware.com> writes:
> [..]
> > The simple grammar does about 99% of what's needed for unfolding
> > header lines.  Tests #1 and #2 work fine.  Test #3 is a couple of
> > characters shorter than #2 (some whitespace and an 'x') and fails.
> > 
> > The challenge is to modify lexer.l so that all 3 tests pass :-)
> 
> Where's lexer.h ?? :)
>  
> > If I've setup the test properly, the modified lexer.l will merge
> > easily into the official bogofilter lexer and bogofilter will handle
> > unfolded header lines properly.  If I don't have it right, there
> > will need to be a second challenge round.
> 
> Done. Get rid of the clr_tag() calls from main.c and use
> a lexer like....
> 
> <INITIAL>\n[ \t]                        { lineno += 1; } /* unfold
> lines */<INITIAL>^\n                                    { BEGIN TEXT;
>                                                   printf("*** BEGIN
>                                                   TEXT***\n");;
>                                                   return(EMPTY);
>                                                 }
> {TOKEN}                                         { return TOKEN;}
> boundary={MIME_BOUNDARY}                        { got_mime_boundary();
> }^--{MIME_BOUNDARY}(--)?$                        {
> mime_boundary_set(); BEGIN INITIAL; return BOUNDARY; }.               
>                                ;                       /* ignore
>                                character */
> \n                                              { lineno += 1;
> clr_tag(); }
> 
> 
> Ta-dah!! :) Note the change to the '\n' pattern.
> 
> Michael.
> 
> PS. I know the whitespace isn't precisely right, but who cares. 
> 
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-- 
David Relson                   Osage Software Systems, Inc.
relson at osagesoftware.com       Ann Arbor, MI 48103
www.osagesoftware.com          tel:  734.821.8800
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