Studio: add tagInput element

Logic/Web/TagInfo.ts

@@ -0,0 +1,49 @@
+import exp from "constants"
+import { Utils } from "../../Utils"
+
+export interface TagInfoStats {
+    /**
+     * The total number of entries in the data array, **not** the total number of objects known in OSM!
+     *
+     * Use `data.find(item => item.type==="all").count` for this
+     */
+    total: number
+    data: {
+        type: "all" | "nodes" | "ways" | "relations"
+        count: number
+        count_fraction: number
+    }[]
+}
+
+export default class TagInfo {
+    private readonly _backend: string
+
+    public static readonly global = new TagInfo()
+
+    constructor(backend = "https://taginfo.openstreetmap.org/") {
+        this._backend = backend
+    }
+
+    public getStats(key: string, value?: string): Promise<TagInfoStats> {
+        let url: string
+        if (value) {
+            url = `${this._backend}api/4/tag/stats?key=${key}&value=${value}`
+        } else {
+            url = `${this._backend}api/4/key/stats?key=${key}`
+        }
+        return Utils.downloadJsonCached(url, 1000 * 60 * 60)
+    }
+
+    /**
+     * Creates the URL to the webpage containing more information
+     * @param k
+     * @param v
+     */
+    webUrl(k: string, v: string) {
+        if (v) {
+            return `${this._backend}/tags/${k}=${v}#overview`
+        } else {
+            return `${this._backend}/keys/${k}#overview`
+        }
+    }
+}