forked from MapComplete/MapComplete
63 lines
1.9 KiB
TypeScript
63 lines
1.9 KiB
TypeScript
import { UIEventSource } from "../UIEventSource"
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import { Utils } from "../../Utils"
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/**
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* UIEventsource-wrapper around localStorage
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*/
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export class LocalStorageSource {
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private static readonly _cache: Record<string, UIEventSource<string>> = {}
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static getParsed<T>(key: string, defaultValue: T): UIEventSource<T> {
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return LocalStorageSource.get(key).sync(
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(str) => {
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if (str === undefined) {
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return defaultValue
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}
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try {
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return JSON.parse(str)
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} catch {
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return defaultValue
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}
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},
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[],
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(value) => JSON.stringify(value),
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)
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}
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static get(key: string, defaultValue: string = undefined): UIEventSource<string> {
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const cached = LocalStorageSource._cache[key]
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if (cached) {
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return cached
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}
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let saved = defaultValue
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if (!Utils.runningFromConsole) {
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try {
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saved = localStorage.getItem(key)
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if (saved === "undefined") {
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saved = undefined
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}
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} catch (e) {
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console.error("Could not get value", key, "from local storage")
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}
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}
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const source = new UIEventSource<string>(saved ?? defaultValue, "localstorage:" + key)
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source.addCallback((data) => {
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if (data === undefined || data === "" || data === null) {
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localStorage.removeItem(key)
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return
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}
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try {
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localStorage.setItem(key, data)
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} catch (e) {
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// Probably exceeded the quota with this item!
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// Let's nuke everything
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localStorage.clear()
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}
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})
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LocalStorageSource._cache[key] = source
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return source
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}
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}
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