On Mon, Nov 28, 2011 at 12:45:30AM +0100, Olaf Hasemann wrote:
>#def and #undef is IMO not so useful at all, cause you allways are able
>to prevent the execution of a rule by catching the element within
>another rule given before the rule you want to 'undef'.
You are right, the #undef would merely allow the OSM parser to drop
uninteresting tags (saving memory). For a relatively rare tag, such as
power=line, this should not make much difference. For more widely-used
tags, you would probably be better off omitting the
include/source/base-style for the tags you are not interested in.
>Allowing an empty element type definition or a keyword 'next' or
>'abort_element' comparable to the awk script 'next' statement would
>help much more keeping the style files simple and readable. Example:
>
>highway=residential & mynamespace:not_usable=yes [ next ]
To my knowledge, this has not been implemented. I am not entirely
convinced of the usefulness. This should be fairly easy to implement,
basically replace the convertNode(), convertWay() calls with a no-op
when the keyword is present. The [] stuff is parsed in
osmstyle/TypeReader.java. Maybe we could simply have a special flag in
GType that tells to omit the conversion in convertWay(), convertNode()
and the like?
Marko
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