Modernize L.OSM.XMLParser implementation

Author: mmd-osm

leaflet-osm.js

@@ -232,101 +232,74 @@ L.OSM.DataLayer = L.FeatureGroup.extend({
 });
 
 L.OSM.XMLParser = {
-  getChangesets: function (xml) {
-    var result = [];
-
-    var nodes = xml.getElementsByTagName("changeset");
-    for (var i = 0; i < nodes.length; i++) {
-      var node = nodes[i], id = node.getAttribute("id");
-      result.push({
-        id: id,
-        type: "changeset",
-        latLngBounds: L.latLngBounds(
-          [node.getAttribute("min_lat"), node.getAttribute("min_lon")],
-          [node.getAttribute("max_lat"), node.getAttribute("max_lon")]),
-        tags: this.getTags(node)
-      });
-    }
-
-    return result;
+  getChangesets(xml) {
+    const changesets = [...xml.getElementsByTagName("changeset")];
+    return changesets.map(cs => ({
+      id: String(cs.getAttribute("id")),
+      type: "changeset",
+      latLngBounds: L.latLngBounds(
+        [cs.getAttribute("min_lat"), cs.getAttribute("min_lon")],
+        [cs.getAttribute("max_lat"), cs.getAttribute("max_lon")]
+      ),
+      tags: this.getTags(cs)
+    }));
   },
 
-  getNodes: function (xml) {
-    var result = {};
+  getNodes(xml) {
+    const result = {};
+    const nodes = [...xml.getElementsByTagName("node")];
 
-    var nodes = xml.getElementsByTagName("node");
-    for (var i = 0; i < nodes.length; i++) {
-      var node = nodes[i], id = node.getAttribute("id");
+    for (const node of nodes) {
+      const id = node.getAttribute("id");
       result[id] = {
-        id: id,
+        id: String(id),
         type: "node",
-        latLng: L.latLng(node.getAttribute("lat"),
-                         node.getAttribute("lon"),
-                         true),
+        latLng: L.latLng(
+          node.getAttribute("lat"),
+          node.getAttribute("lon"),
+          true
+        ),
         tags: this.getTags(node)
       };
     }
 
     return result;
   },
 
-  getWays: function (xml, nodes) {
-    var result = [];
-
-    var ways = xml.getElementsByTagName("way");
-    for (var i = 0; i < ways.length; i++) {
-      var way = ways[i], nds = way.getElementsByTagName("nd");
-
-      var way_object = {
-        id: way.getAttribute("id"),
+  getWays(xml, nodes) {
+    const ways = [...xml.getElementsByTagName("way")];
+    return ways.map(way => {
+      const nds = [...way.getElementsByTagName("nd")];
+      return {
+        id: String(way.getAttribute("id")),
         type: "way",
-        nodes: new Array(nds.length),
+        nodes: nds.map(nd => nodes[nd.getAttribute("ref")]),
         tags: this.getTags(way)
       };
-
-      for (var j = 0; j < nds.length; j++) {
-        way_object.nodes[j] = nodes[nds[j].getAttribute("ref")];
-      }
-
-      result.push(way_object);
-    }
-
-    return result;
+    });
   },
 
-  getRelations: function (xml, nodes, ways) {
-    var result = [];
-
-    var rels = xml.getElementsByTagName("relation");
-    for (var i = 0; i < rels.length; i++) {
-      var rel = rels[i], members = rel.getElementsByTagName("member");
-
-      var rel_object = {
-        id: rel.getAttribute("id"),
+  getRelations(xml, nodes, ways) {
+    const rels = [...xml.getElementsByTagName("relation")];
+    return rels.map(rel => {
+      const members = [...rel.getElementsByTagName("member")];
+      return {
+        id: String(rel.getAttribute("id")),
         type: "relation",
-        members: new Array(members.length),
+        members: members    // relation-way and relation-relation membership not implemented
+          .map(member => member.getAttribute("type") === "node" ? nodes[member.getAttribute("ref")] : null)
+          .filter(Boolean),    // filter out null and undefined
         tags: this.getTags(rel)
       };
-
-      for (var j = 0; j < members.length; j++) {
-        if (members[j].getAttribute("type") === "node")
-          rel_object.members[j] = nodes[members[j].getAttribute("ref")];
-        else // relation-way and relation-relation membership not implemented
-          rel_object.members[j] = null;
-      }
-      rel_object.members = rel_object.members.filter(i => i !== null && i !== undefined)
-      result.push(rel_object);
-    }
-
-    return result;
+    });
   },
 
-  getTags: function (xml) {
-    var result = {};
+  getTags(xml) {
+    const result = {};
+    const tags = [...xml.getElementsByTagName("tag")];
 
-    var tags = xml.getElementsByTagName("tag");
-    for (var j = 0; j < tags.length; j++) {
-      result[tags[j].getAttribute("k")] = tags[j].getAttribute("v");
+    for (const tag of tags) {
+      result[tag.getAttribute("k")] = tag.getAttribute("v");
     }
 
     return result;