[ragel-users] longest matching kleene star & parse error

[Adrian Thurston]

Sorry I don't have anything elegant for you. You'll have to factor out 
and duplicate the error action.

On 11-02-10 05:58 PM, Matthieu Tourne wrote:
> Hi,
>
> I'm trying to write a simple html lexer with ragel.
> I have something looking like this, to match and take an action on the
> attribute 'src=' potentially found in several tag attributes :
>
>    tag_content = (
>          ('src='i  ((('\'' string_sgl_exp) | '"' string_dbl_exp)
>  >src_attr_start
>                        @src_attr_end))
>
>          | any
>      )** <>lerr{  };
>
>      tag_exp = tag_content :>> '>';
>
> My problem is if I create an attribute <img srt="..."> (srt is not a
> proper attribute, but it does generate a parse error).
> What I'd like to do would be <>lerr{ fhold; fgoto tag_content; }, which
> would work if tag_content was an entry point.
> But I use tag_exp in several places where an entry point wouldn't work,
> for instance :
>
> img_tag := tag_exp [...] @end_img_action;
> script_tag := tag_exp [...] @end_script_tag_action;
>
> I've considered creating a ragel scanner, but I don't really care for
> backtracking, I'd just like to be able to hide the error. This would
> work exactly the way I want to, by doing a fgoto tag_content. It would
> basically restart the parse on t='...' and have it would fall under the
> "any" category.
>
> Is there an elegant way to do this, or to just hide the error ?
>
> Thank you,
>
> Matthieu.
>
>
>
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