[mkgmap-dev] Re: Code for Highway Symbols

Wed Apr 15 12:12:30 BST 2009

On Tue, Apr 14, 2009 at 2:28 PM, Toby Speight <T.M.Speight.90 at cantab.net> wrote:
> Clinton> Without the regex and using the subst rule, I get a number of roads
> Clinton> that have improper symbols.  See the attached screen shot for an
> Clinton> example.
>
> Oh - are those really valid 'ref' values?

I think these are most likely incorrect 'ref' values, however they
seem to occur frequently enough in certain maps to be annoying unless
they are filtered out.

> I see what you mean, and I think the right way is probably to upgrade
> my simple 'subst' filter to handle regexps.  Do you think that that
> would be the best solution?
[...]
> That's what I was thinking of.  The syntax would look something like
>
> #> highway=motorway {name '${ref|subst:^[\([AM]\) ?\([0-9]+\)$=>\1\2|prefix:boxx} ${name}'

I like this. :-) I just hope we don't keep extending the style syntax
such that it some day becomes Turing complete. ;-)

Thanks for your work on this.

Cheers.