[mkgmap-dev] handling of a key without a value

Sat Apr 11 16:59:45 BST 2020

Hi Gerd,
I'm not crafty enough to apply the patch, maybe a later release drops the
tags empty values.
Until this ist provided I code ele=*& ele!="" to compile my map.
I don't blame the asterisk since it behaves as expected (* = any
occurrences, including no occurence). I prefer to harden the called
function as you suggested (if (val.isEmpty()) return null;)
So my work-around is a formally correct (but inconvenient) way. Even the
default style doesn't care about that.
Thanks for solving,
Joern

Am Fr., 10. Apr. 2020 um 08:27 Uhr schrieb Gerd Petermann <
gpetermann_muenchen at hotmail.com>:

> Hi Joern,
>
> looks like the node was creaed in a bad import.
> I was sure that mkgmap drops all tags where the value is empty but this
> doesn't happen. The attached patch changes this.
>
> Anyway, it is probably also possible to create an empty tag in the style
> rules, so I think we have to decide if ele=* should match when ele has an
> empty tag value.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von J
> J <joern.de at gmail.com>
> Gesendet: Donnerstag, 9. April 2020 23:21
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] handling of a key without a value
>
> https://www.openstreetmap.org/node/7278416985
> That node seems to crash my style while trying to execute the following
> command:
>   ele=*  {echo 'ele=${ele}'; set ele_m='${ele|conv:"ft=>m"}'; echo
> 'ele_m=${ele}'; }
> The echo command produces "ele=" in the transcript,
> afterwards "java.lang.StringIndexOutOfBoundsException: String index out of
> range: -1" etc.
> The node contains any empty values. "ele" is the only of them my style
> uses.
> Observed in: mkgmap-r4478
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
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