export function osmLanes()

in modules/osm/lanes.js [2:92]
76 lines of code
3 McCabe index (conditional complexity)

export function osmLanes(entity) {
    if (entity.type !== 'way') return null;
    if (!entity.tags.highway) return null;

    var tags = entity.tags;
    var isOneWay = entity.isOneWay();
    var laneCount = getLaneCount(tags, isOneWay);
    var maxspeed = parseMaxspeed(tags);

    var laneDirections = parseLaneDirections(tags, isOneWay, laneCount);
    var forward = laneDirections.forward;
    var backward = laneDirections.backward;
    var bothways = laneDirections.bothways;

    // parse the piped string 'x|y|z' format
    var turnLanes = {};
    turnLanes.unspecified = parseTurnLanes(tags['turn:lanes']);
    turnLanes.forward = parseTurnLanes(tags['turn:lanes:forward']);
    turnLanes.backward = parseTurnLanes(tags['turn:lanes:backward']);

    var maxspeedLanes = {};
    maxspeedLanes.unspecified = parseMaxspeedLanes(tags['maxspeed:lanes'], maxspeed);
    maxspeedLanes.forward = parseMaxspeedLanes(tags['maxspeed:lanes:forward'], maxspeed);
    maxspeedLanes.backward = parseMaxspeedLanes(tags['maxspeed:lanes:backward'], maxspeed);

    var psvLanes = {};
    psvLanes.unspecified = parseMiscLanes(tags['psv:lanes']);
    psvLanes.forward = parseMiscLanes(tags['psv:lanes:forward']);
    psvLanes.backward = parseMiscLanes(tags['psv:lanes:backward']);

    var busLanes = {};
    busLanes.unspecified = parseMiscLanes(tags['bus:lanes']);
    busLanes.forward = parseMiscLanes(tags['bus:lanes:forward']);
    busLanes.backward = parseMiscLanes(tags['bus:lanes:backward']);

    var taxiLanes = {};
    taxiLanes.unspecified = parseMiscLanes(tags['taxi:lanes']);
    taxiLanes.forward = parseMiscLanes(tags['taxi:lanes:forward']);
    taxiLanes.backward = parseMiscLanes(tags['taxi:lanes:backward']);

    var hovLanes = {};
    hovLanes.unspecified = parseMiscLanes(tags['hov:lanes']);
    hovLanes.forward = parseMiscLanes(tags['hov:lanes:forward']);
    hovLanes.backward = parseMiscLanes(tags['hov:lanes:backward']);

    var hgvLanes = {};
    hgvLanes.unspecified = parseMiscLanes(tags['hgv:lanes']);
    hgvLanes.forward = parseMiscLanes(tags['hgv:lanes:forward']);
    hgvLanes.backward = parseMiscLanes(tags['hgv:lanes:backward']);

    var bicyclewayLanes = {};
    bicyclewayLanes.unspecified = parseBicycleWay(tags['bicycleway:lanes']);
    bicyclewayLanes.forward = parseBicycleWay(tags['bicycleway:lanes:forward']);
    bicyclewayLanes.backward = parseBicycleWay(tags['bicycleway:lanes:backward']);

    var lanesObj = {
        forward: [],
        backward: [],
        unspecified: []
    };

    // map forward/backward/unspecified of each lane type to lanesObj
    mapToLanesObj(lanesObj, turnLanes, 'turnLane');
    mapToLanesObj(lanesObj, maxspeedLanes, 'maxspeed');
    mapToLanesObj(lanesObj, psvLanes, 'psv');
    mapToLanesObj(lanesObj, busLanes, 'bus');
    mapToLanesObj(lanesObj, taxiLanes, 'taxi');
    mapToLanesObj(lanesObj, hovLanes, 'hov');
    mapToLanesObj(lanesObj, hgvLanes, 'hgv');
    mapToLanesObj(lanesObj, bicyclewayLanes, 'bicycleway');

    return {
        metadata: {
            count: laneCount,
            oneway: isOneWay,
            forward: forward,
            backward: backward,
            bothways: bothways,
            turnLanes: turnLanes,
            maxspeed: maxspeed,
            maxspeedLanes: maxspeedLanes,
            psvLanes: psvLanes,
            busLanes: busLanes,
            taxiLanes: taxiLanes,
            hovLanes: hovLanes,
            hgvLanes: hgvLanes,
            bicyclewayLanes: bicyclewayLanes
        },
        lanes: lanesObj
    };
}