Initial work on overpass based query API

app/assets/javascripts/index/query.js

@@ -0,0 +1,244 @@
+OSM.Query = function(map) {
+  var queryButton = $(".control-query .control-button"),
+    uninterestingTags = ['source', 'source_ref', 'source:ref', 'history', 'attribution', 'created_by', 'tiger:county', 'tiger:tlid', 'tiger:upload_uuid'],
+    marker;
+
+  queryButton.on("click", function (e) {
+    e.preventDefault();
+    e.stopPropagation();
+
+    if (queryButton.hasClass("active")) {
+      disableQueryMode();
+
+      OSM.router.route("/");
+    } else {
+      enableQueryMode();
+    }
+  });
+
+  $("#sidebar_content")
+    .on("mouseover", ".query-results li", function () {
+      var geometry = $(this).data("geometry")
+      if (geometry) map.addLayer(geometry);
+      $(this).addClass("selected");
+    })
+    .on("mouseout", ".query-results li", function () {
+      var geometry = $(this).data("geometry")
+      if (geometry) map.removeLayer(geometry);
+      $(this).removeClass("selected");
+    });
+
+  function interestingFeature(feature) {
+    if (feature.tags) {
+      for (var key in feature.tags) {
+        if (uninterestingTags.indexOf(key) < 0) {
+          return true;
+        }
+      }
+    }
+
+    return false;
+  }
+
+  function featurePrefix(feature) {
+    var tags = feature.tags;
+    var prefix = "";
+
+    if (tags.boundary === "administrative") {
+      prefix = I18n.t("geocoder.search_osm_nominatim.admin_levels.level" + tags.admin_level)
+    } else {
+      var prefixes = I18n.t("geocoder.search_osm_nominatim.prefix");
+
+      for (var key in tags) {
+        var value = tags[key];
+
+        if (prefixes[key]) {
+          if (prefixes[key][value]) {
+            return prefixes[key][value];
+          } else {
+            var first = value.substr(0, 1).toUpperCase(),
+              rest = value.substr(1).replace(/_/g, " ");
+
+            return first + rest;
+          }
+        }
+      }
+    }
+
+    if (!prefix) {
+      prefix = I18n.t("javascripts.query." + feature.type);
+    }
+
+    return prefix;
+  }
+
+  function featureName(feature) {
+    var tags = feature.tags;
+
+    if (tags["name"]) {
+      return tags["name"];
+    } else if (tags["ref"]) {
+      return tags["ref"];
+    } else if (tags["addr:housenumber"] && tags["addr:street"]) {
+      return tags["addr:housenumber"] + " " + tags["addr:street"];
+    } else {
+      return "#" + feature.id;
+    }
+  }
+
+  function featureLink(feature) {
+    if (feature.type === "area") {
+      if (feature.id >= 3600000000) {
+        var id = feature.id - 3600000000;
+
+        return "/browse/relation/" + id;
+      } else if (feature.id >= 2400000000) {
+        var id = feature.id - 2400000000;
+
+        return "/browse/way/" + id;
+      } else {
+        return "/browse/node/" + feature.id;
+      }
+    } else {
+      return "/browse/" + feature.type + "/" + feature.id;
+    }
+  }
+
+  function featureGeometry(feature, nodes) {
+    var geometry;
+
+    if (feature.type === "node") {
+      geometry = L.circleMarker([feature.lat, feature.lon]);
+    } else if (feature.type === "way") {
+      geometry = L.polyline(feature.nodes.map(function (node) {
+        return nodes[node];
+      }));
+    }
+
+    return geometry;
+  }
+
+  function runQuery(query, $section) {
+    var $ul = $section.find("ul");
+
+    $ul.empty();
+    $section.show();
+
+    $section.find(".loader").oneTime(1000, "loading", function () {
+      $(this).show();
+    });
+
+    $.ajax({
+      url: "http://overpass-api.de/api/interpreter",
+      method: "GET",
+      data: {
+        data: "[timeout:5][out:json];" + query,
+      },
+      success: function(results) {
+        var nodes = {};
+
+        $section.find(".loader").stopTime("loading").hide();
+
+        results.elements.forEach(function (element) {
+          if (element.type === "node") {
+            nodes[element.id] = [element.lat, element.lon];
+          }
+        });
+
+        for (var i = 0; i < results.elements.length; i++) {
+          var element = results.elements[i];
+
+          if (interestingFeature(element)) {
+            var $li = $("<li>")
+              .data("geometry", featureGeometry(element, nodes))
+              .appendTo($ul);
+            var $p = $("<p>")
+              .addClass("inner12 search_results_entry clearfix")
+              .text(featurePrefix(element) + " ")
+              .appendTo($li);
+
+            $("<a>")
+              .attr("href", featureLink(element))
+              .text(featureName(element))
+              .appendTo($p);
+          }
+        }
+      }
+    });
+  }
+
+  function queryOverpass(lat, lng) {
+    var latlng = L.latLng(lat, lng),
+      around = "around:10.0," + lat + "," + lng,
+      features = "(node(" + around + ");way(" + around + ");relation(" + around + "))",
+      nearby = "((" + features + ";way(bn));node(w));out;",
+      isin = "(is_in(" + lat + "," + lng + ");>);out;";
+
+    $("#sidebar_content .query-intro")
+      .hide();
+
+    if (marker) {
+      marker.setLatLng(latlng).addTo(map);
+    } else {
+      marker = L.circle(latlng, 10, { clickable: false }).addTo(map);
+    }
+
+    $(document).everyTime(75, "fadeQueryMarker", function (i) {
+      if (i == 10) {
+        map.removeLayer(marker);
+      } else {
+        marker.setStyle({
+          opacity: 0.5 - i * 0.05,
+          fillOpacity: 0.2 - i * 0.02
+        });
+      }
+    }, 10);
+
+    runQuery(nearby, $("#query-nearby"));
+    runQuery(isin, $("#query-isin"));
+  }
+
+  function clickHandler(e) {
+    var precision = OSM.zoomPrecision(map.getZoom()),
+      lat = e.latlng.lat.toFixed(precision),
+      lng = e.latlng.lng.toFixed(precision);
+
+    OSM.router.route("/query?lat=" + lat + "&lon=" + lng);
+  }
+
+  function enableQueryMode() {
+    queryButton.addClass("active");
+    map.on("click", clickHandler);
+    $(map.getContainer()).addClass("query-active");
+  }
+
+  function disableQueryMode() {
+    if (marker) map.removeLayer(marker);
+    $(map.getContainer()).removeClass("query-active");
+    map.off("click", clickHandler);
+    queryButton.removeClass("active");
+  }
+
+  var page = {};
+
+  page.pushstate = page.popstate = function(path) {
+    OSM.loadSidebarContent(path, function () {
+      page.load(path);
+    });
+  };
+
+  page.load = function(path) {
+    var params = querystring.parse(path.substring(path.indexOf('?') + 1));
+
+    queryOverpass(params.lat, params.lon);
+    enableQueryMode();
+
+    return map.getState();
+  };
+
+  page.unload = function() {
+    disableQueryMode();
+  };
+
+  return page;
+};