[mkgmap-dev] Weekend in Essen

Mon Feb 11 22:03:30 GMT 2013

Hi all,

>> - Doing something with values that are separated with ';'. >This is >> 
clearly desirable, but knowing what exactly to do is less >clear. >> I 
think it would have to be enabled on a tag-by-tag basis. > >I >had already 
been chewing this one over. If we are able to treat the >values as lists, 
where the normal case degenerates to a list of one >value, then we could 
think of simple list manipulation functions such as >"first element", "last 
element", "count of elements", "element N". In >practice the count of 
elements will be quite low (often 2-3 will be >enough I think), so allowing 
a reference to a non-existing element >(returning an empty string) would 
allow quite powerful style-file >constructions with only a couple of lines. 
I'm sure we can get by >without "for each element" constructions which 
sound more difficult to >implement.  > >Nuts to crack:  > > 	* how to 
handle a ";" in the data itself >(escape with preceding backslash? enclose 
value in quotes?) Really this >will need standardising across all 
editors/consumers, but I'm under no >illusions about the feasibility of 
that!

Yes, indeed, the array-handling could be the perfect overkill solution. 
What about thinking a more simple way? Wouldn't it be enough to treat 
a ';' like a 'continue' statement? Split the string, create a new object 
with the remaining string part, and continue rule testing from start. So,
no map makers would have to care about this new option. I don't know 
about mkgmap's internals, could you imagine this is possible?

Btw: there are tags where dividing could be a disadvantage, like in 
opening hours. So only certain keys would be good to split, e.g. 
amenity, or cuisine 

So mkgmap would really be the first application (at least I know...) 
to support ';' tagged objects. 

Cheerio
Manfred

PS: It was a pleasure for me you meet you in Essen, was a lot of fun and
very interesting. Thank you all for coming, especially Steve and WanMil. 
This has given me some motivation to continue on my sleeping project

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20130211/d105f6af/attachment.html 