[ragel-users] Surpressing Mulitple Matches

[Adrian Thurston]

Hi Jonathan,

I think you should consider using a scanner. Though you're not scanning
tokens, you're scanning lines. Should multiple patterns match only one
pattern action will be executed.

-Adrian

Jonathan Stott wrote:
> Hi all
> 
> I'm writing a parser for some irc logs (to convert them to wiki markup and/or html) and the machine is fairly simple. 
> 
> eol = '\n';
> text = any -- eol;
> 
> # action line (generated from /me)
> 
> action_line = timestamp action_nick text %print_action eol;
> 
> 
> # text line, normal irc chat
> 
> text_line = timestamp nick text %print_text eol;
> 
> 
> # system line. Joins, parts etc.  Included so I can ignore it.
> # system_leader is a unique bit of text the irc client puts just after the timestamp for all system info. 
> 
> system_line = timestamp system_leader nick text eol;
> 
> 
> # hr line. A convention which has developed. 
> #A line of just '-'s should be converted to a <hr />
> 
> hr_line = timestamp nick '-'{3,} %print_hr eol;
> 
> line = action_line | text_line | system_line | hr_line
> 
> main := line*
> 
> print_action, print_text both print a nicely formatted line, with two newlines, suitable for the wiki. print_hr prints '----', the wiki markup for a <hr />.  Except that any hr_line, is also a valid text line, so two lines get printed.  And I can't really exclude '-' from a text_line, they do get used in typing.  Is there any solution to avoiding printing both lines? (Beyond the obvious one of some test like 'if this is all -s, don't print' in the print_text action)
> 
> Regards
> Jon
> 
> > 
>