182 lines
6.3 KiB
HTML
182 lines
6.3 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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<body>
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<!-- <script type="text/javascript" src="promifill.js"></script> -->
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<script type="text/javascript">
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const PENDING = 1;
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const RESOLVED = 2;
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const REJECTED = 3;
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function noop() {};
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function SyncPromise(fn) {
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this._listeners = [];
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this._value = null;
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this._state = PENDING;
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fn(this._resolve.bind(this), this._reject.bind(this));
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}
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SyncPromise.prototype = {
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then: function(onResolved, onRejected) {
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if (this._state === PENDING) {
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this._listeners.push({onRejected: onRejected, onResolved: onResolved});
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} else if (this._state === RESOLVED) {
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onResolved(this._value);
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} else if (this._state === REJECTED) {
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onRejected(this._value);
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}
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return this;
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},
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catch: function(onRejected) {
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return this.then(noop, onRejected);
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},
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finally: function(onResolved) {
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return this.then(onResolved, noop);
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},
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_chain: function(value) {
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if (value && typeof value.then === "function") {
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value.then(function(value) {
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self._resolve(value);
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}, function(err) {
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self._reject(err);
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});
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return true;
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} else {
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return false;
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}
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},
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_resolve: function(value) {
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if (!this._chain(value)) {
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this._state = RESOLVED;
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this._value = value;
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for (var i = 0; i < this._listeners.length; i += 1) {
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this._listeners[i].onResolved(value);
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}
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}
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},
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_reject: function(err) {
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this._state = REJECTED;
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this._value = err;
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for (var i = 0; i < this._listeners.length; i += 1) {
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this._listeners[i].onRejected(err);
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}
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}
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}
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SyncPromise.resolve = function(value) {
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return new SyncPromise(function(resolve) {
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resolve(value);
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});
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}
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SyncPromise.reject = function(value) {
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return new SyncPromise(function(_, reject) {
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reject(value);
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});
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}
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window.Promise = SyncPromise;
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</script>
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<!-- <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> -->
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<script type="text/javascript">
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function reqAsPromise(req) {
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return new Promise(function (resolve, reject) {
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req.onsuccess = function() {resolve(req);};
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req.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
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});
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}
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function Storage(databaseName) {
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this._databaseName = databaseName;
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this._database = null;
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}
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Storage.prototype = {
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open: function() {
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const req = window.indexedDB.open(this._databaseName);
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const self = this;
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req.onupgradeneeded = function(ev) {
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const db = ev.target.result;
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const oldVersion = ev.oldVersion;
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self._createStores(db, oldVersion);
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};
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return reqAsPromise(req).then(function() {
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self._database = req.result;
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});
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},
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openTxn: function(mode, storeName) {
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const tx = this._database.transaction([storeName], mode);
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const store = tx.objectStore(storeName);
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return Promise.resolve(store);
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},
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_createStores: function(db) {
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db.createObjectStore("foos", {keyPath: ["id"]});
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}
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};
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function getAll(store) {
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const request = store.openCursor();
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const results = [];
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return new Promise(function(resolve, reject) {
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request.onsuccess = function(event) {
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const cursor = event.target.result;
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if(cursor) {
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results.push(cursor.value);
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cursor.continue();
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} else {
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resolve(results);
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}
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};
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request.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
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});
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}
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function main() {
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let storage = new Storage("idb-promises");
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let store;
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storage.open().then(function() {
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return storage.openTxn("readwrite", "foos");
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}).then(function(s) {
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store = s;
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store.clear();
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store.add({id: 5, name: "foo"});
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store.add({id: 6, name: "bar"});
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return getAll(store);
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}).then(function(all) {
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console.log("all1", all);
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store.add({id: 7, name: "bazzz"});
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return getAll(store);
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}).then(function(all) {
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console.log("all2", all);
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}).catch(function(err) {
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console.error(err.message + ": " + err.stack);
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});
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}
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main();
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/*
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we basically want something like this for IE11/Win7:
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return new Promise(function (resolve, reject) {
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req.onsuccess = function() {
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resolve(req);
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Promise?.flushQueue();
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};
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req.onerror = function(e) {
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reject(new Error("IDB request failed: " + e.target.error.message));
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Promise?.flushQueue();
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};
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});
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we don't have this problem on platforms with a native promise implementation, so we can just have our own (forked) promise polyfill?
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*/
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</script>
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</body>
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</html>
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