[mkgmap-dev] Preprocessor for style files

Wed Jan 4 14:53:24 GMT 2012

My style file are becoming more and more complex.
IMHO a (simple) preprocessor would be very helpful.

Important features (analogue C preprocessor):
- ##include (includes a text file)
- ##define (defines a preprocessor var; also as command line option)
- ##ifdef (checks if a preprocessor var is defined)
-   ##else (else for ##ifdef)
- ##endif (end of ##ifdef)

A simple example (for polygons):

##define BASECAMP
...
##include "indexrules.txt"
...
##ifdef BASECAMP
  # draw buildings
  building = * [0x13 resolution 20]
##endif
...

Questions:
- What do think of this proposal ? 
- Does anyone already uses an external preprocessor for the style files ?

Regards Klaus

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