[mkgmap-dev] Style rules and 'generated' tags

Thu Jul 2 08:46:59 BST 2009

Hi all,

I’ve been trying to work on some style rule files and am running into  
a few problems.

The rules I’m using (in ‘lines’) are this:

	ncn_ref=* { set ncn=yes; echo 'Converting from ${ncn_ref}'; }
	  ( highway=bridleway | highway=byway | highway=cycleway |
	  highway=track | highway=footway) & ( ncn=yes | rcn=yes )
	  { set offroad='yes'; echo 'Offroad route'; }
	ncn=yes { echo 'Is NCN'; }
	offroad=yes { echo 'Is offroad'; }
	ncn=yes & offroad=yes { echo 'NCN Offroad'; set highway=ncn_offroad; }
	ncn=yes & offroad!=* { echo 'NCN Onroad'; set highway=ncn_onroad; }

(As you can see I added an echo statement to aid debugging... that’s  
about the limit of my Java. :) )

Unfortunately, the penultimate rule (‘NCN Offroad’) never fires.  
Instead, the next one (‘NCN Onroad’) always does.

The debug output for one way looks like this:

	31346279: Is NCN
	testing for offroad	<-- debug statement from get in Tags
	testing for offroad
	31346279: NCN Onroad
	31346279: Converting from 5
	testing for offroad
	set offroad yes		<-- debug statement from perform in AddTagAction
	31346279: Offroad route
	31346279: Creating NCN on-road with 5 	<-- highway=ncn_onroad [0x01]
	31346279: Is NCN
	testing for offroad
	testing for offroad
	31346279: NCN Onroad
	31346279: Is offroad
	31346279: Creating NCN on-road with 5

So although the ‘Is offroad’ test is working, the next line isn’t. The  
fact it’s iterating over the rules a couple of times is a bit odd, too.

 From what I can tell, get (in Tags.java) isn’t coping very well with  
the ExtraEntry tags. But despite poking around for a couple of hours,  
I’ve not pinned it down - like I say my Java knowledge is verging on  
non-existent. Or maybe I’m just doing something stupid with the rules.

Any clues?

cheers
Richard