[mkgmap-dev] To do: If-Then-Else

Tue Feb 7 23:24:19 GMT 2017

if (<exp>) {
 some rules
} else {
other rules
}

That's exactly what I had in mind. Adding another parameter, like a
CONSTANT, to the invocation would work (especially for the case of building
clutter) but is not nearly as flexible or powerful as an internal
if-then-else capability to process style rules and act on them
conditionally.

On Wed, Feb 8, 2017 at 4:35 AM, Andrzej Popowski <popej at poczta.onet.pl>
wrote:

> Hi Gerd,
>
> could you implement simple conditional statements, which would be analyzed
> at the stage of reading style? Similarly like statement "include" is
> processed.
>
> I think the simplest version would contain 3 tokens:
> ifdefined CONSTANT
> ifnotdefined CONSTANT
> endif
>
> Scanner should look for ifdefined/ifnotdefined, check if CONSTANT exist
> and then analyze or skip rules until it finds token endif. It should
> support nesting. CONSTANT would be given as command line option. Or maybe
> even as an additional token, like "define CONSTANT".
>
>
> --
> Best regards,
> Andrzej
>
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>

-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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