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create function to test if a way is part of specifict type of relations

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Michal Palenik 2018-05-31 21:53:56 +02:00
parent 3b4e2e83ef
commit 454ffc2686
1 changed files with 14 additions and 0 deletions
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14
profiles/lib/relations.lua
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@ -258,4 +258,18 @@ function Relations.process_way_refs(way, relations, result)
end end
end end
function Relations.filter_relations(relations, way, key, value, ret, forward)
-- if any of way's relation have key=value, return tag ret; else return nil
-- todo: check backward and forward
if not forward then forward = 'forward'; end -- ignored at the moment
local rel_id_list = relations:get_relations(way)
for i, rel_id in ipairs(rel_id_list) do
local rel = relations:relation(rel_id);
local p = rel:get_value_by_key(key);
if value == '*' and p then return rel:get_value_by_key(ret); end
if p == value then return rel:get_value_by_key(ret); end
end
return nil;
end
return Relations return Relations