Hi Gert, In your example you use proposed=footway. I've never seen any tagging like that - what does it mean? Give us a better description of what you're trying to accomplish in your test statement if (highway=proposed) proposed=footway {delete highway} surface=asphalt {echotags "test" } [... ] end On Mon, Feb 27, 2017 at 5:51 PM, Gerd Petermann < GPetermann_muenchen@hotmail.com> wrote:
Hi all,
I try to make up my mind about what is needed and what is not.
1) I did not yet find a good reason to have an else clause, so I think we should start without implementing it
unless one can give a good example.
2) The banch now implements the syntax if (EXPR) then ... end by adding the expression EXPR to each of the rules between 'then' and 'end' . Nested if-then are allowed. This might cause confusion in the following case:
if (highway=proposed) proposed=footway {delete highway} surface=asphalt {echotags "test" } [... ] end What should happen for a way with highway=proposed, proposed=footway, surface=asphalt ?
I'd expect that the 2nd rule with echotags is triggered, but it is not because after the interpretation of the if-then clause the rules look like this:
proposed=footway & highway=proposed {delete highway} surface=asphalt & highway=proposed {echotags "test" } [... ]
and since the first rule deletes the highway tag the 2nd isn't triggered.
My suggested interpretation was like this: highway=proposed {set mkgmap:if:1000=true}
proposed=footway & mkgmap:if:1000=true {delete highway}
surface=asphalt & mkgmap:if:1000=true {echotags "test" } [... ]
And I think that we should make sure that those generated special tags like mkgmap:if:1000 are not used directly by the style author .
Another option might be to disallow the modification of any tag which appears in EXPR. No idea if that would be easier to implement but I fear that it would lead to very confusing error messages.
Comments?
ciao,
Gerd
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