prototypes for idb and promises in older browsers
This commit is contained in:
Bruno Windels
parent
a7ceabad37
commit
624d341bc6
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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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@ -0,0 +1,433 @@
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"use strict";
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function _createForOfIteratorHelper(o, allowArrayLike) { var it; if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = o[Symbol.iterator](); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
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function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
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function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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var PENDING = void 0,
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FULFILLED = true,
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REJECTED = false;
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var Promifill = /*#__PURE__*/function () {
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_createClass(Promifill, [{
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key: "state",
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get: function get() {
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return PENDING;
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}
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}, {
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key: "value",
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get: function get() {
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return void 0;
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}
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}, {
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key: "settled",
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get: function get() {
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return false;
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}
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}]);
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function Promifill(executor) {
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var _this = this;
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_classCallCheck(this, Promifill);
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if (typeof executor != "function") {
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throw new TypeError("Promise resolver ".concat(Object.prototype.toString.call(executor), " is not a function"));
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}
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defineProperty(this, "chain", []);
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defineProperty(this, "observers", []);
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var secret = [];
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var resolve = function resolve(value, bypassKey) {
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if (_this.settled && bypassKey !== secret) {
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return;
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}
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defineProperty(_this, "settled", true);
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var then_ = value && value.then;
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var thenable = typeof then_ == "function";
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if (thenable) {
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defineProperty(value, "preventThrow", true);
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}
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if (thenable && value.state === PENDING) {
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then_.call(value, function (v) {
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return resolve(v, secret);
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}, function (r) {
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return reject(r, secret);
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});
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} else {
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defineProperty(_this, "value", thenable ? value.value : value);
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defineProperty(_this, "state", thenable ? value.state : FULFILLED);
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schedule(_this.observers.map(function (observer) {
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return {
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handler: _this.state === FULFILLED ? observer.onfulfill : observer.onreject,
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value: _this.value
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};
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}));
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if (_this.state === REJECTED) {
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raiseUnhandledPromiseRejectionException(_this.value, _this);
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}
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}
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};
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var reject = function reject(reason, bypassKey) {
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if (_this.settled && bypassKey !== secret) {
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return;
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}
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defineProperty(_this, "settled", true);
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defineProperty(_this, "value", reason);
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defineProperty(_this, "state", REJECTED);
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schedule(_this.observers.map(function (observer) {
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return {
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handler: observer.onreject,
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value: _this.value
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};
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}));
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raiseUnhandledPromiseRejectionException(_this.value, _this);
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};
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try {
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executor(resolve, reject);
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} catch (error) {
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reject(error);
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}
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}
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_createClass(Promifill, [{
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key: "then",
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value: function then(onfulfill, onreject) {
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var _this2 = this;
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var chainedPromise = new this.constructor(function (resolve, reject) {
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var internalOnfulfill = function internalOnfulfill(value) {
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try {
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resolve(typeof onfulfill == "function" ? onfulfill(value) : value);
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} catch (error) {
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reject(error);
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}
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};
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var internalOnreject = function internalOnreject(reason) {
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try {
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if (typeof onreject == "function") {
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resolve(onreject(reason));
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} else {
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reject(reason);
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}
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} catch (error) {
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reject(error);
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}
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};
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if (_this2.state === PENDING) {
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_this2.observers.push({
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onfulfill: internalOnfulfill,
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onreject: internalOnreject
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});
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} else {
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schedule([{
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handler: _this2.state === FULFILLED ? internalOnfulfill : internalOnreject,
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value: _this2.value
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}]);
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}
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});
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this.chain.push(chainedPromise);
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return chainedPromise;
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}
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}, {
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key: "catch",
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value: function _catch(onreject) {
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return this.then(null, onreject);
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}
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}, {
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key: "finally",
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value: function _finally(oncomplete) {
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var _this3 = this;
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var chainedPromise = new this.constructor(function (resolve, reject) {
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var internalOncomplete = function internalOncomplete() {
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try {
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oncomplete();
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if (_this3.state === FULFILLED) {
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resolve(_this3.value);
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} else {
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reject(_this3.value);
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}
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} catch (error) {
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reject(error);
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}
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};
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if (_this3.state === PENDING) {
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_this3.observers.push({
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onfulfill: internalOncomplete,
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onreject: internalOncomplete
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});
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} else {
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schedule([{
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handler: internalOncomplete
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}]);
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}
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});
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this.chain.push(chainedPromise);
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return chainedPromise;
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}
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}], [{
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key: "resolve",
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value: function resolve(value) {
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return value && value.constructor === Promifill ? value : new Promifill(function (resolve) {
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resolve(value);
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});
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}
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}, {
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key: "reject",
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value: function reject(reason) {
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return new Promifill(function (_, reject) {
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reject(reason);
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});
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}
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}, {
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key: "all",
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value: function all(iterable) {
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return new Promifill(function (resolve, reject) {
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validateIterable(iterable);
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var iterableSize = 0;
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var values = [];
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if (isEmptyIterable(iterable)) {
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return resolve(values);
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}
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var add = function add(value, index) {
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values[index] = value;
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if (values.filter(function () {
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return true;
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}).length === iterableSize) {
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resolve(values);
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}
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};
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var _iterator = _createForOfIteratorHelper(iterable),
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_step;
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try {
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for (_iterator.s(); !(_step = _iterator.n()).done;) {
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var item = _step.value;
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(function (entry, index) {
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Promifill.resolve(entry).then(function (value) {
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return add(value, index);
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}, reject);
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})(item, iterableSize++);
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}
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} catch (err) {
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_iterator.e(err);
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||||
} finally {
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_iterator.f();
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}
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});
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}
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}, {
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||||
key: "race",
|
||||
value: function race(iterable) {
|
||||
return new Promifill(function (resolve, reject) {
|
||||
validateIterable(iterable);
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||||
|
||||
if (isEmptyIterable(iterable)) {
|
||||
return;
|
||||
}
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||||
|
||||
var _iterator2 = _createForOfIteratorHelper(iterable),
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_step2;
|
||||
|
||||
try {
|
||||
for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
|
||||
var entry = _step2.value;
|
||||
Promifill.resolve(entry).then(resolve, reject);
|
||||
}
|
||||
} catch (err) {
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||||
_iterator2.e(err);
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||||
} finally {
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_iterator2.f();
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}
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});
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}
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}]);
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return Promifill;
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}();
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|
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var defineProperty = function defineProperty(obj, propName, propValue) {
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Object.defineProperty(obj, propName, {
|
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value: propValue
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||||
});
|
||||
};
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var defer = function defer(handler) {
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return function () {
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||||
for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
|
||||
args[_key] = arguments[_key];
|
||||
}
|
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|
||||
setTimeout.apply(void 0, [handler, 0].concat(args));
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||||
};
|
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};
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var thrower = function thrower(error) {
|
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throw error instanceof Error ? error : new Error(error);
|
||||
};
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|
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var raiseUnhandledPromiseRejectionException = defer(function (error, promise) {
|
||||
if (promise.preventThrow || promise.chain.length > 0) {
|
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return;
|
||||
}
|
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|
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thrower(error);
|
||||
});
|
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|
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var MutationObserverStrategy = /*#__PURE__*/function () {
|
||||
function MutationObserverStrategy(handler) {
|
||||
_classCallCheck(this, MutationObserverStrategy);
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||||
|
||||
var observer = new MutationObserver(handler);
|
||||
var node = this.node = document.createTextNode("");
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observer.observe(node, {
|
||||
characterData: true
|
||||
});
|
||||
}
|
||||
|
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_createClass(MutationObserverStrategy, [{
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||||
key: "trigger",
|
||||
value: function trigger() {
|
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this.node.data = this.node.data === 1 ? 0 : 1;
|
||||
}
|
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}]);
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||||
return MutationObserverStrategy;
|
||||
}();
|
||||
|
||||
var NextTickStrategy = /*#__PURE__*/function () {
|
||||
function NextTickStrategy(handler) {
|
||||
_classCallCheck(this, NextTickStrategy);
|
||||
|
||||
this.scheduleNextTick = function () {
|
||||
return process.nextTick(handler);
|
||||
};
|
||||
}
|
||||
|
||||
_createClass(NextTickStrategy, [{
|
||||
key: "trigger",
|
||||
value: function trigger() {
|
||||
this.scheduleNextTick();
|
||||
}
|
||||
}]);
|
||||
|
||||
return NextTickStrategy;
|
||||
}();
|
||||
|
||||
var BetterThanNothingStrategy = /*#__PURE__*/function () {
|
||||
function BetterThanNothingStrategy(handler) {
|
||||
_classCallCheck(this, BetterThanNothingStrategy);
|
||||
|
||||
this.scheduleAsap = function () {
|
||||
return setTimeout(handler, 0);
|
||||
};
|
||||
}
|
||||
|
||||
_createClass(BetterThanNothingStrategy, [{
|
||||
key: "trigger",
|
||||
value: function trigger() {
|
||||
this.scheduleAsap();
|
||||
}
|
||||
}]);
|
||||
|
||||
return BetterThanNothingStrategy;
|
||||
}();
|
||||
|
||||
var getStrategy = function getStrategy() {
|
||||
if (typeof window != "undefined" && typeof window.MutationObserver == "function") {
|
||||
return MutationObserverStrategy;
|
||||
}
|
||||
|
||||
if (typeof global != "undefined" && typeof process != "undefined" && typeof process.nextTick == "function") {
|
||||
return NextTickStrategy;
|
||||
}
|
||||
|
||||
return BetterThanNothingStrategy;
|
||||
};
|
||||
|
||||
var schedule = function () {
|
||||
var microtasks = [];
|
||||
|
||||
var run = function run() {
|
||||
var handler, value;
|
||||
|
||||
while (microtasks.length > 0 && (_microtasks$shift = microtasks.shift(), handler = _microtasks$shift.handler, value = _microtasks$shift.value, _microtasks$shift)) {
|
||||
var _microtasks$shift;
|
||||
|
||||
handler(value);
|
||||
}
|
||||
};
|
||||
|
||||
var Strategy = getStrategy();
|
||||
var ctrl = new Strategy(run);
|
||||
return function (observers) {
|
||||
if (observers.length == 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
microtasks = microtasks.concat(observers);
|
||||
observers.length = 0;
|
||||
ctrl.trigger();
|
||||
};
|
||||
}();
|
||||
|
||||
var isIterable = function isIterable(subject) {
|
||||
return subject != null && typeof subject[Symbol.iterator] == "function";
|
||||
};
|
||||
|
||||
var validateIterable = function validateIterable(subject) {
|
||||
if (isIterable(subject)) {
|
||||
return;
|
||||
}
|
||||
|
||||
throw new TypeError("Cannot read property 'Symbol(Symbol.iterator)' of ".concat(Object.prototype.toString.call(subject), "."));
|
||||
};
|
||||
|
||||
var isEmptyIterable = function isEmptyIterable(subject) {
|
||||
var _iterator3 = _createForOfIteratorHelper(subject),
|
||||
_step3;
|
||||
|
||||
try {
|
||||
for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
|
||||
var _ = _step3.value;
|
||||
// eslint-disable-line no-unused-vars
|
||||
return false;
|
||||
}
|
||||
} catch (err) {
|
||||
_iterator3.e(err);
|
||||
} finally {
|
||||
_iterator3.f();
|
||||
}
|
||||
|
||||
return true;
|
||||
};
|
||||
|
||||
//if (!window.Promise) {
|
||||
window.Promise = Promifill;
|
||||
//}
|
||||
Reference in New Issue