app/assets/javascripts/index/directions/fossgis_osrm.js

   1 // OSRM engine
   2 // Doesn't yet support hints
   3
   4 (function () {
   5   function FOSSGISOSRMEngine(modeId, vehicleType) {
   6     let cachedHints = [];
   7
   8     function _processDirections(route) {
   9       const INSTRUCTION_TEMPLATE = {
  10         "continue": "continue",
  11         "merge right": "merge_right",
  12         "merge left": "merge_left",
  13         "off ramp right": "offramp_right",
  14         "off ramp left": "offramp_left",
  15         "on ramp right": "onramp_right",
  16         "on ramp left": "onramp_left",
  17         "fork right": "fork_right",
  18         "fork left": "fork_left",
  19         "end of road right": "endofroad_right",
  20         "end of road left": "endofroad_left",
  21         "turn straight": "continue",
  22         "turn slight right": "slight_right",
  23         "turn right": "turn_right",
  24         "turn sharp right": "sharp_right",
  25         "turn uturn": "uturn",
  26         "turn sharp left": "sharp_left",
  27         "turn left": "turn_left",
  28         "turn slight left": "slight_left",
  29         "roundabout": "roundabout",
  30         "rotary": "roundabout",
  31         "exit roundabout": "exit_roundabout",
  32         "exit rotary": "exit_roundabout",
  33         "depart": "start",
  34         "arrive": "destination"
  35       };
  36       const ICON_MAP = {
  37         "continue": "straight",
  38         "merge right": "merge-right",
  39         "merge left": "merge-left",
  40         "off ramp right": "exit-right",
  41         "off ramp left": "exit-left",
  42         "on ramp right": "right",
  43         "on ramp left": "left",
  44         "fork right": "fork-right",
  45         "fork left": "fork-left",
  46         "end of road right": "end-of-road-right",
  47         "end of road left": "end-of-road-left",
  48         "turn straight": "straight",
  49         "turn slight right": "slight-right",
  50         "turn right": "right",
  51         "turn sharp right": "sharp-right",
  52         "turn uturn": "u-turn-left",
  53         "turn slight left": "slight-left",
  54         "turn left": "left",
  55         "turn sharp left": "sharp-left",
  56         "roundabout": "roundabout",
  57         "rotary": "roundabout",
  58         "exit roundabout": "roundabout",
  59         "exit rotary": "roundabout",
  60         "depart": "start",
  61         "arrive": "destination"
  62       };
  63       function numToWord(num) {
  64         return ["first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth"][num - 1];
  65       }
  66       function getManeuverId(maneuver) {
  67         // special case handling
  68         switch (maneuver.type) {
  69           case "on ramp":
  70           case "off ramp":
  71           case "merge":
  72           case "end of road":
  73           case "fork":
  74             return maneuver.type + " " + (maneuver.modifier.indexOf("left") >= 0 ? "left" : "right");
  75           case "depart":
  76           case "arrive":
  77           case "roundabout":
  78           case "rotary":
  79           case "exit roundabout":
  80           case "exit rotary":
  81             return maneuver.type;
  82           case "roundabout turn":
  83           case "turn":
  84             return "turn " + maneuver.modifier;
  85             // for unknown types the fallback is turn
  86           default:
  87             return "turn " + maneuver.modifier;
  88         }
  89       }
  90
  91       const steps = route.legs.flatMap(
  92         leg => leg.steps.map(function (step, idx) {
  93           const maneuver_id = getManeuverId(step.maneuver);
  94
  95           const instrPrefix = "javascripts.directions.instructions.";
  96           let template = instrPrefix + INSTRUCTION_TEMPLATE[maneuver_id];
  97
  98           const step_geometry = L.PolylineUtil.decode(step.geometry, { precision: 5 }).map(L.latLng);
  99
 100           let instText = "<b>" + (idx + 1) + ".</b> ";
 101           const destinations = "<b>" + step.destinations + "</b>";
 102           let namedRoad = true;
 103           let name;
 104
 105           if (step.name && step.ref) {
 106             name = "<b>" + step.name + " (" + step.ref + ")</b>";
 107           } else if (step.name) {
 108             name = "<b>" + step.name + "</b>";
 109           } else if (step.ref) {
 110             name = "<b>" + step.ref + "</b>";
 111           } else {
 112             name = OSM.i18n.t(instrPrefix + "unnamed");
 113             namedRoad = false;
 114           }
 115
 116           if (step.maneuver.type.match(/^exit (rotary|roundabout)$/)) {
 117             instText += OSM.i18n.t(template, { name: name });
 118           } else if (step.maneuver.type.match(/^(rotary|roundabout)$/)) {
 119             if (step.maneuver.exit) {
 120               if (step.maneuver.exit <= 10) {
 121                 instText += OSM.i18n.t(template + "_with_exit_ordinal", { exit: OSM.i18n.t(instrPrefix + "exit_counts." + numToWord(step.maneuver.exit)), name: name });
 122               } else {
 123                 instText += OSM.i18n.t(template + "_with_exit", { exit: step.maneuver.exit, name: name });
 124               }
 125             } else {
 126               instText += OSM.i18n.t(template + "_without_exit", { name: name });
 127             }
 128           } else if (step.maneuver.type.match(/^(on ramp|off ramp)$/)) {
 129             const params = {};
 130             if (step.exits && step.maneuver.type.match(/^(off ramp)$/)) params.exit = step.exits;
 131             if (step.destinations) params.directions = destinations;
 132             if (namedRoad) params.directions = name;
 133             if (Object.keys(params).length > 0) {
 134               template = template + "_with_" + Object.keys(params).join("_");
 135             }
 136             instText += OSM.i18n.t(template, params);
 137           } else {
 138             instText += OSM.i18n.t(template + "_without_exit", { name: name });
 139           }
 140           return [[step.maneuver.location[1], step.maneuver.location[0]], ICON_MAP[maneuver_id], instText, step.distance, step_geometry];
 141         })
 142       );
 143
 144       return {
 145         line: steps.flatMap(step => step[4]),
 146         steps,
 147         distance: route.distance,
 148         time: route.duration
 149       };
 150     }
 151
 152     return {
 153       mode: modeId,
 154       provider: "fossgis_osrm",
 155       creditline: "<a href=\"https://routing.openstreetmap.de/about.html\" target=\"_blank\">OSRM (FOSSGIS)</a>",
 156       draggable: true,
 157
 158       getRoute: function (points, signal) {
 159         const query = new URLSearchParams({
 160           overview: "false",
 161           geometries: "polyline",
 162           steps: true
 163         });
 164
 165         if (cachedHints.length === points.length) {
 166           query.set("hints", cachedHints.join(";"));
 167         } else {
 168           // invalidate cache
 169           cachedHints = [];
 170         }
 171
 172         const req_path = "routed-" + vehicleType + "/route/v1/driving/" + points.map(p => p.lng + "," + p.lat).join(";");
 173
 174         return fetch(OSM.FOSSGIS_OSRM_URL + req_path + "?" + query, { signal })
 175           .then(response => response.json())
 176           .then(response => {
 177             if (response.code !== "Ok") throw new Error();
 178             cachedHints = response.waypoints.map(wp => wp.hint);
 179             return _processDirections(response.routes[0]);
 180           });
 181       }
 182     };
 183   }
 184
 185   OSM.Directions.addEngine(new FOSSGISOSRMEngine("car", "car"), true);
 186   OSM.Directions.addEngine(new FOSSGISOSRMEngine("bicycle", "bike"), true);
 187   OSM.Directions.addEngine(new FOSSGISOSRMEngine("foot", "foot"), true);
 188 }());