Make style.lua code nicer

[systemed]

You should be able to cut out a bunch of the if statements this way.

Add before the function definitions:

polygon_keys = { 'building', 'landuse', 'amenity', 'harbour', 'historic', 'leisure', 
                 'man_made', 'military', 'natural', 'office', 'place', 'power',
                 'public_transport', 'shop', 'sport', 'tourism', 'waterway',
                 'wetland', 'water', 'aeroway' }

then replace the if statements in filter_tags_way with:

    for i,k in ipairs(polygon_keys) do
        if keyvalues[k] then
            poly=1
            break
        end
    end

[apmon]

Thanks for the suggestion. I have cleaned up the style.lua which is in the repository a bit according to this.

I think this might have made processing slower though (~10%). I haven't really done many benchmarks though.