Hi Andrew,
Hmmm, that's an idea. Leaving actions executed on error ... I'm going to
have to mull over that. Might be the right thing to do.
How is the aliphatic_organic used?
You may be able to do the following:
something = (
aliphatic_organic @1 |
any @0 @{raise error}
)**
Andrew Dalke wrote:
> Hi all,
>
> I'm updating a parser I wrote a couple of years ago, which parses a molecular
> format called SMILES. Molecules contain atoms and bonds. The atoms include
> the element name as an abbreviation.
>
> Consider C and Cl as two such abbreviations. One is a prefix of the other. I
> had
>
> is_raw_atom = (
> #
> 'B' % raw_atom_B_5_action |
> 'C' % raw_atom_C_6_action |
> 'Cl' % raw_atom_Cl_17_action |
> ...
>
> and that worked for what I was doing before, but now I'm trying to get error
> handling to work. Suppose someone does "CQ". I want raw_atom_C_6_action to
> occur and then an error.
>
> Ragel doesn't do that. It reports the error at the 'C', because it never
> transitions out from the end state.
>
> What I did in my current update (in addition to changing the action names) is
> this:
>
> aliphatic_organic = (
> 'B' %is_aliphatic_B %err(is_aliphatic_B) |
> 'C' %is_aliphatic_C %err(is_aliphatic_C) |
> 'N' >is_aliphatic_N |
> ...
> 'Cl' %is_aliphatic_Cl %err(is_aliphatic_Cl) |
> 'Br' @is_aliphatic_Br |
> ...
> );
>
>
> It works, but is it correct and proper? I did see there was the |* ... *|
> construct designed for things like this, but I didn't want the backtracking.
>
> Best regards,
>
>
> Andrew
> [email protected]
>
>
>
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