WIP: more features in inspector

src/UI/History/HistoryUtils.ts

@@ -0,0 +1,35 @@
+import * as all_layers from "../../assets/generated/themes/personal.json"
+import ThemeConfig from "../../Models/ThemeConfig/ThemeConfig"
+import { OsmObject } from "../../Logic/Osm/OsmObject"
+
+export class HistoryUtils {
+
+    private static personalTheme = new ThemeConfig(<any> all_layers, true)
+    private static ignoredLayers = new Set<string>(["fixme"])
+    public static determineLayer(properties: Record<string, string>){
+        return this.personalTheme.getMatchingLayer(properties, this.ignoredLayers)
+    }
+
+    public static tagHistoryDiff(step: OsmObject, history: OsmObject[]): {
+        key: string,
+        value?: string,
+        oldValue?: string
+    }[] {
+        const previous = history[step.version - 2]
+        if (!previous) {
+            return Object.keys(step.tags).filter(key => !key.startsWith("_") && key !== "id").map(key => ({
+                key, value: step.tags[key]
+            }))
+        }
+        const previousTags = previous.tags
+        return Object.keys(step.tags).filter(key => !key.startsWith("_") )
+            .map(key => {
+                const value = step.tags[key]
+                const oldValue = previousTags[key]
+                return {
+                    key, value, oldValue
+                }
+            }).filter(ch => ch.oldValue !== ch.value)
+    }
+
+}