Refactoring: move all code files into a src directory

src/Logic/Web/LocalStorageSource.ts

@@ -0,0 +1,43 @@
+import { UIEventSource } from "../UIEventSource"
+
+/**
+ * UIEventsource-wrapper around localStorage
+ */
+export class LocalStorageSource {
+    static GetParsed<T>(key: string, defaultValue: T): UIEventSource<T> {
+        return LocalStorageSource.Get(key).sync(
+            (str) => {
+                if (str === undefined) {
+                    return defaultValue
+                }
+                try {
+                    return JSON.parse(str)
+                } catch {
+                    return defaultValue
+                }
+            },
+            [],
+            (value) => JSON.stringify(value)
+        )
+    }
+
+    static Get(key: string, defaultValue: string = undefined): UIEventSource<string> {
+        try {
+            const saved = localStorage.getItem(key)
+            const source = new UIEventSource<string>(saved ?? defaultValue, "localstorage:" + key)
+
+            source.addCallback((data) => {
+                try {
+                    localStorage.setItem(key, data)
+                } catch (e) {
+                    // Probably exceeded the quota with this item!
+                    // Lets nuke everything
+                    localStorage.clear()
+                }
+            })
+            return source
+        } catch (e) {
+            return new UIEventSource<string>(defaultValue)
+        }
+    }
+}