osm2geojson-ultra/dist/json.js

a faster & more complete OSM & Overpass (either in xml or in json formats) to geojson convertor - 4x faster than xmldom + osmtogeojson in most situations - implemented in TypeScript with txml for XML parsing

import { purgeProps } from "./utils.js";
import { Node } from "./node.js";
import { Output } from "./output.js";
import { Way } from "./way.js";
import { Relation } from "./relation.js";
export default function analyzeFeaturesFromJson(osm, refElements) {
    var _a;
    for (const elem of osm.elements) {
        // Check for evidence ths is a derived element and process if so
        if ((_a = elem.geometry) === null || _a === void 0 ? void 0 : _a.type) {
            const obj = new Output(elem.type, elem.id, refElements);
            if (elem.tags) {
                obj.addTags(elem.tags);
            }
            obj.addMetas(purgeProps(elem, [
                "id",
                "type",
                "tags",
                "geometry",
            ]));
            obj.setGeometry(elem.geometry);
            continue;
        }
        // handle nodes/ways/relations
        switch (elem.type) {
            case "node":
                const node = new Node(elem.id, refElements);
                if (elem.tags) {
                    node.addTags(elem.tags);
                }
                node.addMetas(purgeProps(elem, [
                    "id",
                    "type",
                    "tags",
                    "lat",
                    "lon",
                ]));
                node.setLatLng(elem);
                break;
            case "way":
                const way = new Way(elem.id, refElements);
                if (elem.tags) {
                    way.addTags(elem.tags);
                }
                way.addMetas(purgeProps(elem, [
                    "id",
                    "type",
                    "tags",
                    "nodes",
                    "geometry",
                ]));
                if (elem.geometry) {
                    way.setLatLngArray(elem.geometry);
                }
                else if (elem.center) {
                    way.setCenter(elem.center);
                }
                else if (elem.nodes) {
                    for (const n of elem.nodes) {
                        way.addNodeRef(n);
                    }
                }
                break;
            case "relation":
                const relation = new Relation(elem.id, refElements);
                if (elem.bounds) {
                    relation.setBounds([
                        parseFloat(elem.bounds.minlon),
                        parseFloat(elem.bounds.minlat),
                        parseFloat(elem.bounds.maxlon),
                        parseFloat(elem.bounds.maxlat),
                    ]);
                }
                if (elem.tags) {
                    relation.addTags(elem.tags);
                }
                if (elem.center) {
                    relation.setCenter(elem.center);
                }
                relation.addMetas(purgeProps(elem, [
                    "id",
                    "type",
                    "tags",
                    "bounds",
                    "members",
                ]));
                if (elem.members) {
                    for (const member of elem.members) {
                        relation.addMember(member);
                    }
                }
                break;
        }
    }
}