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MapCSS parser for Ruby
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Ruby MapCSS parser ================== This is an experimental Ruby parser for MapCSS 0.2, based on the Halcyon parser. == Dependencies == You'll require Jochen Topf's OSMlib library. We use the Node, Way and Relation objects from this. Unlike Halcyon, OSMlib doesn't keep track of 'parent' objects, so we have a singleton Dictionary class to store this mapping. == How to use == Install style_parser and style_parser.rb into a lib/ directory. Require style_parser as usual. Read a MapCSS file like this: ruleset=StyleParser::RuleSet.new(12,20) # 12 and 20 are min/max zoom levels ruleset.parse_from_file('opencyclemap.css') Create the parent object mappings from an OSMlib database: dictionary = StyleParser::Dictionary.instance dictionary.populate(db) Then get the style for any OSM object like this: entity=db.get_way(3044458) stylelist=ruleset.get_styles(entity,entity.tags,14) # 14 is the target zoom level puts stylelist You can see an example of this in osm_test.rb. == Limitations == - It hasn't really been tested at all. - The test stylesheet is MapCSS 0.1. That's not too helpful. ;) - Setting tags from the stylesheet doesn't yet work. - Any limitations of Halcyon's parser are also present here. == Licence and author == WTFPL. You can do whatever the fuck you want with this code. Code by Richard Fairhurst, summer 2011. Example files: OpenCycleMap Potlatch 2 style by Andy Allan, Charlbury OpenStreetMap data by OpenStreetMap contributors (CC-BY-SA).