MediaWiki:Gadget-localforage.js
注意：在保存之后，您可能需要清除浏览器缓存才能看到所作出的变更的影响。
- Firefox或Safari：按住Shift的同时单击刷新，或按Ctrl-F5或Ctrl-R（Mac为⌘-R）
- Google Chrome：按Ctrl-Shift-R（Mac为⌘-Shift-R）
- Internet Explorer：按住Ctrl的同时单击刷新，或按Ctrl-F5
- Opera：前往菜单 → 设置（Mac为Opera → Preferences），然后隐私和安全 → 清除浏览数据 → 缓存的图片和文件。
/*!
localForage -- Offline Storage, Improved
Version 1.7.4
https://localforage.github.io/localForage
(c) 2013-2017 Mozilla, Apache License 2.0
*/
(function(f) {
if (typeof exports === "object" && typeof module !== "undefined") {
module.exports = f();
} else if (typeof define === "function" && define.amd) {
define([], f);
} else {
var g;
if (typeof window !== "undefined") {
g = window;
} else if (typeof global !== "undefined") {
g = global;
} else if (typeof self !== "undefined") {
g = self;
} else {
g = this;
}
g.localforage = f();
}
})(function() {
var define, module, exports;
return function e(t, n, r) {
function s(o, u) {
if (!n[o]) {
if (!t[o]) {
var a = typeof require == "function" && require;
if (!u && a) return a(o, !0);
if (i) return i(o, !0);
var f = new Error("Cannot find module '" + o + "'");
throw f.code = "MODULE_NOT_FOUND", f;
}
var l = n[o] = {
exports: {}
};
t[o][0].call(l.exports, function(e) {
var n = t[o][1][e];
return s(n ? n : e);
}, l, l.exports, e, t, n, r);
}
return n[o].exports;
}
var i = typeof require == "function" && require;
for (var o = 0; o < r.length; o++) s(r[o]);
return s;
}({
1: [function(_dereq_, module, exports) {
(function(global) {
"use strict";
var Mutation = global.MutationObserver || global.WebKitMutationObserver;
var scheduleDrain; {
if (Mutation) {
var called = 0;
var observer = new Mutation(nextTick);
var element = global.document.createTextNode("");
observer.observe(element, {
characterData: true
});
scheduleDrain = function() {
element.data = called = ++called % 2;
};
} else if (!global.setImmediate && typeof global.MessageChannel !== "undefined") {
var channel = new global.MessageChannel();
channel.port1.onmessage = nextTick;
scheduleDrain = function() {
channel.port2.postMessage(0);
};
} else if ("document" in global && "onreadystatechange" in global.document.createElement("script")) {
scheduleDrain = function() {
// Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
// into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
var scriptEl = global.document.createElement("script");
scriptEl.onreadystatechange = function() {
nextTick();
scriptEl.onreadystatechange = null;
scriptEl.parentNode.removeChild(scriptEl);
scriptEl = null;
};
global.document.documentElement.appendChild(scriptEl);
};
} else {
scheduleDrain = function() {
setTimeout(nextTick, 0);
};
}
}
var draining;
var queue = [];
//named nextTick for less confusing stack traces
function nextTick() {
draining = true;
var i, oldQueue;
var len = queue.length;
while (len) {
oldQueue = queue;
queue = [];
i = -1;
while (++i < len) {
oldQueue[i]();
}
len = queue.length;
}
draining = false;
}
module.exports = immediate;
function immediate(task) {
if (queue.push(task) === 1 && !draining) {
scheduleDrain();
}
}
}).call(this, typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {});
}, {}],
2: [function(_dereq_, module, exports) {
"use strict";
var immediate = _dereq_(1);
/* istanbul ignore next */
function INTERNAL() {}
var handlers = {};
var REJECTED = ["REJECTED"];
var FULFILLED = ["FULFILLED"];
var PENDING = ["PENDING"];
module.exports = Promise;
function Promise(resolver) {
if (typeof resolver !== "function") {
throw new TypeError("resolver must be a function");
}
this.state = PENDING;
this.queue = [];
this.outcome = void 0;
if (resolver !== INTERNAL) {
safelyResolveThenable(this, resolver);
}
}
Promise.prototype["catch"] = function(onRejected) {
return this.then(null, onRejected);
};
Promise.prototype.then = function(onFulfilled, onRejected) {
if (typeof onFulfilled !== "function" && this.state === FULFILLED || typeof onRejected !== "function" && this.state === REJECTED) {
return this;
}
var promise = new this.constructor(INTERNAL);
if (this.state !== PENDING) {
var resolver = this.state === FULFILLED ? onFulfilled : onRejected;
unwrap(promise, resolver, this.outcome);
} else {
this.queue.push(new QueueItem(promise, onFulfilled, onRejected));
}
return promise;
};
function QueueItem(promise, onFulfilled, onRejected) {
this.promise = promise;
if (typeof onFulfilled === "function") {
this.onFulfilled = onFulfilled;
this.callFulfilled = this.otherCallFulfilled;
}
if (typeof onRejected === "function") {
this.onRejected = onRejected;
this.callRejected = this.otherCallRejected;
}
}
QueueItem.prototype.callFulfilled = function(value) {
handlers.resolve(this.promise, value);
};
QueueItem.prototype.otherCallFulfilled = function(value) {
unwrap(this.promise, this.onFulfilled, value);
};
QueueItem.prototype.callRejected = function(value) {
handlers.reject(this.promise, value);
};
QueueItem.prototype.otherCallRejected = function(value) {
unwrap(this.promise, this.onRejected, value);
};
function unwrap(promise, func, value) {
immediate(function() {
var returnValue;
try {
returnValue = func(value);
} catch (e) {
return handlers.reject(promise, e);
}
if (returnValue === promise) {
handlers.reject(promise, new TypeError("Cannot resolve promise with itself"));
} else {
handlers.resolve(promise, returnValue);
}
});
}
handlers.resolve = function(self, value) {
var result = tryCatch(getThen, value);
if (result.status === "error") {
return handlers.reject(self, result.value);
}
var thenable = result.value;
if (thenable) {
safelyResolveThenable(self, thenable);
} else {
self.state = FULFILLED;
self.outcome = value;
var i = -1;
var len = self.queue.length;
while (++i < len) {
self.queue[i].callFulfilled(value);
}
}
return self;
};
handlers.reject = function(self, error) {
self.state = REJECTED;
self.outcome = error;
var i = -1;
var len = self.queue.length;
while (++i < len) {
self.queue[i].callRejected(error);
}
return self;
};
function getThen(obj) {
// Make sure we only access the accessor once as required by the spec
var then = obj && obj.then;
if (obj && (typeof obj === "object" || typeof obj === "function") && typeof then === "function") {
return function appyThen() {
then.apply(obj, arguments);
};
}
}
function safelyResolveThenable(self, thenable) {
// Either fulfill, reject or reject with error
var called = false;
function onError(value) {
if (called) {
return;
}
called = true;
handlers.reject(self, value);
}
function onSuccess(value) {
if (called) {
return;
}
called = true;
handlers.resolve(self, value);
}
function tryToUnwrap() {
thenable(onSuccess, onError);
}
var result = tryCatch(tryToUnwrap);
if (result.status === "error") {
onError(result.value);
}
}
function tryCatch(func, value) {
var out = {};
try {
out.value = func(value);
out.status = "success";
} catch (e) {
out.status = "error";
out.value = e;
}
return out;
}
Promise.resolve = resolve;
function resolve(value) {
if (value instanceof this) {
return value;
}
return handlers.resolve(new this(INTERNAL), value);
}
Promise.reject = reject;
function reject(reason) {
var promise = new this(INTERNAL);
return handlers.reject(promise, reason);
}
Promise.all = all;
function all(iterable) {
var self = this;
if (Object.prototype.toString.call(iterable) !== "[object Array]") {
return this.reject(new TypeError("must be an array"));
}
var len = iterable.length;
var called = false;
if (!len) {
return this.resolve([]);
}
var values = new Array(len);
var resolved = 0;
var i = -1;
var promise = new this(INTERNAL);
while (++i < len) {
allResolver(iterable[i], i);
}
return promise;
function allResolver(value, i) {
self.resolve(value).then(resolveFromAll, function(error) {
if (!called) {
called = true;
handlers.reject(promise, error);
}
});
function resolveFromAll(outValue) {
values[i] = outValue;
if (++resolved === len && !called) {
called = true;
handlers.resolve(promise, values);
}
}
}
}
Promise.race = race;
function race(iterable) {
var self = this;
if (Object.prototype.toString.call(iterable) !== "[object Array]") {
return this.reject(new TypeError("must be an array"));
}
var len = iterable.length;
var called = false;
if (!len) {
return this.resolve([]);
}
var i = -1;
var promise = new this(INTERNAL);
while (++i < len) {
resolver(iterable[i]);
}
return promise;
function resolver(value) {
self.resolve(value).then(function(response) {
if (!called) {
called = true;
handlers.resolve(promise, response);
}
}, function(error) {
if (!called) {
called = true;
handlers.reject(promise, error);
}
});
}
}
}, {
"1": 1
}],
3: [function(_dereq_, module, exports) {
(function(global) {
"use strict";
if (typeof global.Promise !== "function") {
global.Promise = _dereq_(2);
}
}).call(this, typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {});
}, {
"2": 2
}],
4: [function(_dereq_, module, exports) {
"use strict";
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function(obj) {
return typeof obj;
} : function(obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function getIDB() {
/* global indexedDB,webkitIndexedDB,mozIndexedDB,OIndexedDB,msIndexedDB */
try {
if (typeof indexedDB !== "undefined") {
return indexedDB;
}
if (typeof webkitIndexedDB !== "undefined") {
return webkitIndexedDB;
}
if (typeof mozIndexedDB !== "undefined") {
return mozIndexedDB;
}
if (typeof OIndexedDB !== "undefined") {
return OIndexedDB;
}
if (typeof msIndexedDB !== "undefined") {
return msIndexedDB;
}
} catch (e) {
return;
}
}
var idb = getIDB();
function isIndexedDBValid() {
try {
// Initialize IndexedDB; fall back to vendor-prefixed versions
// if needed.
if (!idb || !idb.open) {
return false;
}
// We mimic PouchDB here;
//
// We test for openDatabase because IE Mobile identifies itself
// as Safari. Oh the lulz...
var isSafari = typeof openDatabase !== "undefined" && /(Safari|iPhone|iPad|iPod)/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent) && !/BlackBerry/.test(navigator.platform);
var hasFetch = typeof fetch === "function" && fetch.toString().indexOf("[native code") !== -1;
// Safari <10.1 does not meet our requirements for IDB support
// (see: https://github.com/pouchdb/pouchdb/issues/5572).
// Safari 10.1 shipped with fetch, we can use that to detect it.
// Note: this creates issues with `window.fetch` polyfills and
// overrides; see:
// https://github.com/localForage/localForage/issues/856
return (!isSafari || hasFetch) && typeof indexedDB !== "undefined" && // some outdated implementations of IDB that appear on Samsung
// and HTC Android devices <4.4 are missing IDBKeyRange
// See: https://github.com/mozilla/localForage/issues/128
// See: https://github.com/mozilla/localForage/issues/272
typeof IDBKeyRange !== "undefined";
} catch (e) {
return false;
}
}
// Abstracts constructing a Blob object, so it also works in older
// browsers that don't support the native Blob constructor. (i.e.
// old QtWebKit versions, at least).
// Abstracts constructing a Blob object, so it also works in older
// browsers that don't support the native Blob constructor. (i.e.
// old QtWebKit versions, at least).
function createBlob(parts, properties) {
/* global BlobBuilder,MSBlobBuilder,MozBlobBuilder,WebKitBlobBuilder */
parts = parts || [];
properties = properties || {};
try {
return new Blob(parts, properties);
} catch (e) {
if (e.name !== "TypeError") {
throw e;
}
var Builder = typeof BlobBuilder !== "undefined" ? BlobBuilder : typeof MSBlobBuilder !== "undefined" ? MSBlobBuilder : typeof MozBlobBuilder !== "undefined" ? MozBlobBuilder : WebKitBlobBuilder;
var builder = new Builder();
for (var i = 0; i < parts.length; i += 1) {
builder.append(parts[i]);
}
return builder.getBlob(properties.type);
}
}
// This is CommonJS because lie is an external dependency, so Rollup
// can just ignore it.
if (typeof Promise === "undefined") {
// In the "nopromises" build this will just throw if you don't have
// a global promise object, but it would throw anyway later.
_dereq_(3);
}
var Promise$1 = Promise;
function executeCallback(promise, callback) {
if (callback) {
promise.then(function(result) {
callback(null, result);
}, function(error) {
callback(error);
});
}
}
function executeTwoCallbacks(promise, callback, errorCallback) {
if (typeof callback === "function") {
promise.then(callback);
}
if (typeof errorCallback === "function") {
promise["catch"](errorCallback);
}
}
function normalizeKey(key) {
// Cast the key to a string, as that's all we can set as a key.
if (typeof key !== "string") {
console.warn(key + " used as a key, but it is not a string.");
key = String(key);
}
return key;
}
function getCallback() {
if (arguments.length && typeof arguments[arguments.length - 1] === "function") {
return arguments[arguments.length - 1];
}
}
// Some code originally from async_storage.js in
// [Gaia](https://github.com/mozilla-b2g/gaia).
var DETECT_BLOB_SUPPORT_STORE = "local-forage-detect-blob-support";
var supportsBlobs = void 0;
var dbContexts = {};
var toString = Object.prototype.toString;
// Transaction Modes
var READ_ONLY = "readonly";
var READ_WRITE = "readwrite";
// Transform a binary string to an array buffer, because otherwise
// weird stuff happens when you try to work with the binary string directly.
// It is known.
// From http://stackoverflow.com/questions/14967647/ (continues on next line)
// encode-decode-image-with-base64-breaks-image (2013-04-21)
function _binStringToArrayBuffer(bin) {
var length = bin.length;
var buf = new ArrayBuffer(length);
var arr = new Uint8Array(buf);
for (var i = 0; i < length; i++) {
arr[i] = bin.charCodeAt(i);
}
return buf;
}
//
// Blobs are not supported in all versions of IndexedDB, notably
// Chrome <37 and Android <5. In those versions, storing a blob will throw.
//
// Various other blob bugs exist in Chrome v37-42 (inclusive).
// Detecting them is expensive and confusing to users, and Chrome 37-42
// is at very low usage worldwide, so we do a hacky userAgent check instead.
//
// content-type bug: https://code.google.com/p/chromium/issues/detail?id=408120
// 404 bug: https://code.google.com/p/chromium/issues/detail?id=447916
// FileReader bug: https://code.google.com/p/chromium/issues/detail?id=447836
//
// Code borrowed from PouchDB. See:
// https://github.com/pouchdb/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-idb/src/blobSupport.js
//
function _checkBlobSupportWithoutCaching(idb) {
return new Promise$1(function(resolve) {
var txn = idb.transaction(DETECT_BLOB_SUPPORT_STORE, READ_WRITE);
var blob = createBlob([""]);
txn.objectStore(DETECT_BLOB_SUPPORT_STORE).put(blob, "key");
txn.onabort = function(e) {
// If the transaction aborts now its due to not being able to
// write to the database, likely due to the disk being full
e.preventDefault();
e.stopPropagation();
resolve(false);
};
txn.oncomplete = function() {
var matchedChrome = navigator.userAgent.match(/Chrome\/(\d+)/);
var matchedEdge = navigator.userAgent.match(/Edge\//);
// MS Edge pretends to be Chrome 42:
// https://msdn.microsoft.com/en-us/library/hh869301%28v=vs.85%29.aspx
resolve(matchedEdge || !matchedChrome || parseInt(matchedChrome[1], 10) >= 43);
};
})["catch"](function() {
return false;
});
}
function _checkBlobSupport(idb) {
if (typeof supportsBlobs === "boolean") {
return Promise$1.resolve(supportsBlobs);
}
return _checkBlobSupportWithoutCaching(idb).then(function(value) {
supportsBlobs = value;
return supportsBlobs;
});
}
function _deferReadiness(dbInfo) {
var dbContext = dbContexts[dbInfo.name];
// Create a deferred object representing the current database operation.
var deferredOperation = {};
deferredOperation.promise = new Promise$1(function(resolve, reject) {
deferredOperation.resolve = resolve;
deferredOperation.reject = reject;
});
// Enqueue the deferred operation.
dbContext.deferredOperations.push(deferredOperation);
// Chain its promise to the database readiness.
if (!dbContext.dbReady) {
dbContext.dbReady = deferredOperation.promise;
} else {
dbContext.dbReady = dbContext.dbReady.then(function() {
return deferredOperation.promise;
});
}
}
function _advanceReadiness(dbInfo) {
var dbContext = dbContexts[dbInfo.name];
// Dequeue a deferred operation.
var deferredOperation = dbContext.deferredOperations.pop();
// Resolve its promise (which is part of the database readiness
// chain of promises).
if (deferredOperation) {
deferredOperation.resolve();
return deferredOperation.promise;
}
}
function _rejectReadiness(dbInfo, err) {
var dbContext = dbContexts[dbInfo.name];
// Dequeue a deferred operation.
var deferredOperation = dbContext.deferredOperations.pop();
// Reject its promise (which is part of the database readiness
// chain of promises).
if (deferredOperation) {
deferredOperation.reject(err);
return deferredOperation.promise;
}
}
function _getConnection(dbInfo, upgradeNeeded) {
return new Promise$1(function(resolve, reject) {
dbContexts[dbInfo.name] = dbContexts[dbInfo.name] || createDbContext();
if (dbInfo.db) {
if (upgradeNeeded) {
_deferReadiness(dbInfo);
dbInfo.db.close();
} else {
return resolve(dbInfo.db);
}
}
var dbArgs = [dbInfo.name];
if (upgradeNeeded) {
dbArgs.push(dbInfo.version);
}
var openreq = idb.open.apply(idb, dbArgs);
if (upgradeNeeded) {
openreq.onupgradeneeded = function(e) {
var db = openreq.result;
try {
db.createObjectStore(dbInfo.storeName);
if (e.oldVersion <= 1) {
// Added when support for blob shims was added
db.createObjectStore(DETECT_BLOB_SUPPORT_STORE);
}
} catch (ex) {
if (ex.name === "ConstraintError") {
console.warn('The database "' + dbInfo.name + '"' + " has been upgraded from version " + e.oldVersion + " to version " + e.newVersion + ', but the storage "' + dbInfo.storeName + '" already exists.');
} else {
throw ex;
}
}
};
}
openreq.onerror = function(e) {
e.preventDefault();
reject(openreq.error);
};
openreq.onsuccess = function() {
resolve(openreq.result);
_advanceReadiness(dbInfo);
};
});
}
function _getOriginalConnection(dbInfo) {
return _getConnection(dbInfo, false);
}
function _getUpgradedConnection(dbInfo) {
return _getConnection(dbInfo, true);
}
function _isUpgradeNeeded(dbInfo, defaultVersion) {
if (!dbInfo.db) {
return true;
}
var isNewStore = !dbInfo.db.objectStoreNames.contains(dbInfo.storeName);
var isDowngrade = dbInfo.version < dbInfo.db.version;
var isUpgrade = dbInfo.version > dbInfo.db.version;
if (isDowngrade) {
// If the version is not the default one
// then warn for impossible downgrade.
if (dbInfo.version !== defaultVersion) {
console.warn('The database "' + dbInfo.name + '"' + " can't be downgraded from version " + dbInfo.db.version + " to version " + dbInfo.version + ".");
}
// Align the versions to prevent errors.
dbInfo.version = dbInfo.db.version;
}
if (isUpgrade || isNewStore) {
// If the store is new then increment the version (if needed).
// This will trigger an "upgradeneeded" event which is required
// for creating a store.
if (isNewStore) {
var incVersion = dbInfo.db.version + 1;
if (incVersion > dbInfo.version) {
dbInfo.version = incVersion;
}
}
return true;
}
return false;
}
// encode a blob for indexeddb engines that don't support blobs
function _encodeBlob(blob) {
return new Promise$1(function(resolve, reject) {
var reader = new FileReader();
reader.onerror = reject;
reader.onloadend = function(e) {
var base64 = btoa(e.target.result || "");
resolve({
__local_forage_encoded_blob: true,
data: base64,
type: blob.type
});
};
reader.readAsBinaryString(blob);
});
}
// decode an encoded blob
function _decodeBlob(encodedBlob) {
var arrayBuff = _binStringToArrayBuffer(atob(encodedBlob.data));
return createBlob([arrayBuff], {
type: encodedBlob.type
});
}
// is this one of our fancy encoded blobs?
function _isEncodedBlob(value) {
return value && value.__local_forage_encoded_blob;
}
// Specialize the default `ready()` function by making it dependent
// on the current database operations. Thus, the driver will be actually
// ready when it's been initialized (default) *and* there are no pending
// operations on the database (initiated by some other instances).
function _fullyReady(callback) {
var self = this;
var promise = self._initReady().then(function() {
var dbContext = dbContexts[self._dbInfo.name];
if (dbContext && dbContext.dbReady) {
return dbContext.dbReady;
}
});
executeTwoCallbacks(promise, callback, callback);
return promise;
}
// Try to establish a new db connection to replace the
// current one which is broken (i.e. experiencing
// InvalidStateError while creating a transaction).
function _tryReconnect(dbInfo) {
_deferReadiness(dbInfo);
var dbContext = dbContexts[dbInfo.name];
var forages = dbContext.forages;
for (var i = 0; i < forages.length; i++) {
var forage = forages[i];
if (forage._dbInfo.db) {
forage._dbInfo.db.close();
forage._dbInfo.db = null;
}
}
dbInfo.db = null;
return _getOriginalConnection(dbInfo).then(function(db) {
dbInfo.db = db;
if (_isUpgradeNeeded(dbInfo)) {
// Reopen the database for upgrading.
return _getUpgradedConnection(dbInfo);
}
return db;
}).then(function(db) {
// store the latest db reference
// in case the db was upgraded
dbInfo.db = dbContext.db = db;
for (var i = 0; i < forages.length; i++) {
forages[i]._dbInfo.db = db;
}
})["catch"](function(err) {
_rejectReadiness(dbInfo, err);
throw err;
});
}
// FF doesn't like Promises (micro-tasks) and IDDB store operations,
// so we have to do it with callbacks
function createTransaction(dbInfo, mode, callback, retries) {
if (retries === undefined) {
retries = 1;
}
try {
var tx = dbInfo.db.transaction(dbInfo.storeName, mode);
callback(null, tx);
} catch (err) {
if (retries > 0 && (!dbInfo.db || err.name === "InvalidStateError" || err.name === "NotFoundError")) {
return Promise$1.resolve().then(function() {
if (!dbInfo.db || err.name === "NotFoundError" && !dbInfo.db.objectStoreNames.contains(dbInfo.storeName) && dbInfo.version <= dbInfo.db.version) {
// increase the db version, to create the new ObjectStore
if (dbInfo.db) {
dbInfo.version = dbInfo.db.version + 1;
}
// Reopen the database for upgrading.
return _getUpgradedConnection(dbInfo);
}
}).then(function() {
return _tryReconnect(dbInfo).then(function() {
createTransaction(dbInfo, mode, callback, retries - 1);
});
})["catch"](callback);
}
callback(err);
}
}
function createDbContext() {
return {
// Running localForages sharing a database.
forages: [],
// Shared database.
db: null,
// Database readiness (promise).
dbReady: null,
// Deferred operations on the database.
deferredOperations: []
};
}
// Open the IndexedDB database (automatically creates one if one didn't
// previously exist), using any options set in the config.
function _initStorage(options) {
var self = this;
var dbInfo = {
db: null
};
if (options) {
for (var i in options) {
dbInfo[i] = options[i];
}
}
// Get the current context of the database;
var dbContext = dbContexts[dbInfo.name];
// ...or create a new context.
if (!dbContext) {
dbContext = createDbContext();
// Register the new context in the global container.
dbContexts[dbInfo.name] = dbContext;
}
// Register itself as a running localForage in the current context.
dbContext.forages.push(self);
// Replace the default `ready()` function with the specialized one.
if (!self._initReady) {
self._initReady = self.ready;
self.ready = _fullyReady;
}
// Create an array of initialization states of the related localForages.
var initPromises = [];
function ignoreErrors() {
// Don't handle errors here,
// just makes sure related localForages aren't pending.
return Promise$1.resolve();
}
for (var j = 0; j < dbContext.forages.length; j++) {
var forage = dbContext.forages[j];
if (forage !== self) {
// Don't wait for itself...
initPromises.push(forage._initReady()["catch"](ignoreErrors));
}
}
// Take a snapshot of the related localForages.
var forages = dbContext.forages.slice(0);
// Initialize the connection process only when
// all the related localForages aren't pending.
return Promise$1.all(initPromises).then(function() {
dbInfo.db = dbContext.db;
// Get the connection or open a new one without upgrade.
return _getOriginalConnection(dbInfo);
}).then(function(db) {
dbInfo.db = db;
if (_isUpgradeNeeded(dbInfo, self._defaultConfig.version)) {
// Reopen the database for upgrading.
return _getUpgradedConnection(dbInfo);
}
return db;
}).then(function(db) {
dbInfo.db = dbContext.db = db;
self._dbInfo = dbInfo;
// Share the final connection amongst related localForages.
for (var k = 0; k < forages.length; k++) {
var forage = forages[k];
if (forage !== self) {
// Self is already up-to-date.
forage._dbInfo.db = dbInfo.db;
forage._dbInfo.version = dbInfo.version;
}
}
});
}
function getItem(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var req = store.get(key);
req.onsuccess = function() {
var value = req.result;
if (value === undefined) {
value = null;
}
if (_isEncodedBlob(value)) {
value = _decodeBlob(value);
}
resolve(value);
};
req.onerror = function() {
reject(req.error);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
// Iterate over all items stored in database.
function iterate(iterator, callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var req = store.openCursor();
var iterationNumber = 1;
req.onsuccess = function() {
var cursor = req.result;
if (cursor) {
var value = cursor.value;
if (_isEncodedBlob(value)) {
value = _decodeBlob(value);
}
var result = iterator(value, cursor.key, iterationNumber++);
// when the iterator callback returns any
// (non-`undefined`) value, then we stop
// the iteration immediately
if (result !== void 0) {
resolve(result);
} else {
cursor["continue"]();
}
} else {
resolve();
}
};
req.onerror = function() {
reject(req.error);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function setItem(key, value, callback) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
var dbInfo;
self.ready().then(function() {
dbInfo = self._dbInfo;
if (toString.call(value) === "[object Blob]") {
return _checkBlobSupport(dbInfo.db).then(function(blobSupport) {
if (blobSupport) {
return value;
}
return _encodeBlob(value);
});
}
return value;
}).then(function(value) {
createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
// The reason we don't _save_ null is because IE 10 does
// not support saving the `null` type in IndexedDB. How
// ironic, given the bug below!
// See: https://github.com/mozilla/localForage/issues/161
if (value === null) {
value = undefined;
}
var req = store.put(value, key);
transaction.oncomplete = function() {
// Cast to undefined so the value passed to
// callback/promise is the same as what one would get out
// of `getItem()` later. This leads to some weirdness
// (setItem('foo', undefined) will return `null`), but
// it's not my fault localStorage is our baseline and that
// it's weird.
if (value === undefined) {
value = null;
}
resolve(value);
};
transaction.onabort = transaction.onerror = function() {
var err = req.error ? req.error : req.transaction.error;
reject(err);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function removeItem(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
// We use a Grunt task to make this safe for IE and some
// versions of Android (including those used by Cordova).
// Normally IE won't like `.delete()` and will insist on
// using `['delete']()`, but we have a build step that
// fixes this for us now.
var req = store["delete"](key);
transaction.oncomplete = function() {
resolve();
};
transaction.onerror = function() {
reject(req.error);
};
// The request will be also be aborted if we've exceeded our storage
// space.
transaction.onabort = function() {
var err = req.error ? req.error : req.transaction.error;
reject(err);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function clear(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_WRITE, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var req = store.clear();
transaction.oncomplete = function() {
resolve();
};
transaction.onabort = transaction.onerror = function() {
var err = req.error ? req.error : req.transaction.error;
reject(err);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function length(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var req = store.count();
req.onsuccess = function() {
resolve(req.result);
};
req.onerror = function() {
reject(req.error);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function key(n, callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
if (n < 0) {
resolve(null);
return;
}
self.ready().then(function() {
createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var advanced = false;
var req = store.openKeyCursor();
req.onsuccess = function() {
var cursor = req.result;
if (!cursor) {
// this means there weren't enough keys
resolve(null);
return;
}
if (n === 0) {
// We have the first key, return it if that's what they
// wanted.
resolve(cursor.key);
} else {
if (!advanced) {
// Otherwise, ask the cursor to skip ahead n
// records.
advanced = true;
cursor.advance(n);
} else {
// When we get here, we've got the nth key.
resolve(cursor.key);
}
}
};
req.onerror = function() {
reject(req.error);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function keys(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
createTransaction(self._dbInfo, READ_ONLY, function(err, transaction) {
if (err) {
return reject(err);
}
try {
var store = transaction.objectStore(self._dbInfo.storeName);
var req = store.openKeyCursor();
var keys = [];
req.onsuccess = function() {
var cursor = req.result;
if (!cursor) {
resolve(keys);
return;
}
keys.push(cursor.key);
cursor["continue"]();
};
req.onerror = function() {
reject(req.error);
};
} catch (e) {
reject(e);
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function dropInstance(options, callback) {
callback = getCallback.apply(this, arguments);
var currentConfig = this.config();
options = typeof options !== "function" && options || {};
if (!options.name) {
options.name = options.name || currentConfig.name;
options.storeName = options.storeName || currentConfig.storeName;
}
var self = this;
var promise;
if (!options.name) {
promise = Promise$1.reject("Invalid arguments");
} else {
var isCurrentDb = options.name === currentConfig.name && self._dbInfo.db;
var dbPromise = isCurrentDb ? Promise$1.resolve(self._dbInfo.db) : _getOriginalConnection(options).then(function(db) {
var dbContext = dbContexts[options.name];
var forages = dbContext.forages;
dbContext.db = db;
for (var i = 0; i < forages.length; i++) {
forages[i]._dbInfo.db = db;
}
return db;
});
if (!options.storeName) {
promise = dbPromise.then(function(db) {
_deferReadiness(options);
var dbContext = dbContexts[options.name];
var forages = dbContext.forages;
db.close();
for (var i = 0; i < forages.length; i++) {
var forage = forages[i];
forage._dbInfo.db = null;
}
var dropDBPromise = new Promise$1(function(resolve, reject) {
var req = idb.deleteDatabase(options.name);
req.onerror = req.onblocked = function(err) {
var db = req.result;
if (db) {
db.close();
}
reject(err);
};
req.onsuccess = function() {
var db = req.result;
if (db) {
db.close();
}
resolve(db);
};
});
return dropDBPromise.then(function(db) {
dbContext.db = db;
for (var i = 0; i < forages.length; i++) {
var _forage = forages[i];
_advanceReadiness(_forage._dbInfo);
}
})["catch"](function(err) {
(_rejectReadiness(options, err) || Promise$1.resolve())["catch"](function() {});
throw err;
});
});
} else {
promise = dbPromise.then(function(db) {
if (!db.objectStoreNames.contains(options.storeName)) {
return;
}
var newVersion = db.version + 1;
_deferReadiness(options);
var dbContext = dbContexts[options.name];
var forages = dbContext.forages;
db.close();
for (var i = 0; i < forages.length; i++) {
var forage = forages[i];
forage._dbInfo.db = null;
forage._dbInfo.version = newVersion;
}
var dropObjectPromise = new Promise$1(function(resolve, reject) {
var req = idb.open(options.name, newVersion);
req.onerror = function(err) {
var db = req.result;
db.close();
reject(err);
};
req.onupgradeneeded = function() {
var db = req.result;
db.deleteObjectStore(options.storeName);
};
req.onsuccess = function() {
var db = req.result;
db.close();
resolve(db);
};
});
return dropObjectPromise.then(function(db) {
dbContext.db = db;
for (var j = 0; j < forages.length; j++) {
var _forage2 = forages[j];
_forage2._dbInfo.db = db;
_advanceReadiness(_forage2._dbInfo);
}
})["catch"](function(err) {
(_rejectReadiness(options, err) || Promise$1.resolve())["catch"](function() {});
throw err;
});
});
}
}
executeCallback(promise, callback);
return promise;
}
var asyncStorage = {
_driver: "asyncStorage",
_initStorage: _initStorage,
_support: isIndexedDBValid(),
iterate: iterate,
getItem: getItem,
setItem: setItem,
removeItem: removeItem,
clear: clear,
length: length,
key: key,
keys: keys,
dropInstance: dropInstance
};
function isWebSQLValid() {
return typeof openDatabase === "function";
}
// Sadly, the best way to save binary data in WebSQL/localStorage is serializing
// it to Base64, so this is how we store it to prevent very strange errors with less
// verbose ways of binary <-> string data storage.
var BASE_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var BLOB_TYPE_PREFIX = "~~local_forage_type~";
var BLOB_TYPE_PREFIX_REGEX = /^~~local_forage_type~([^~]+)~/;
var SERIALIZED_MARKER = "__lfsc__:";
var SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER.length;
// OMG the serializations!
var TYPE_ARRAYBUFFER = "arbf";
var TYPE_BLOB = "blob";
var TYPE_INT8ARRAY = "si08";
var TYPE_UINT8ARRAY = "ui08";
var TYPE_UINT8CLAMPEDARRAY = "uic8";
var TYPE_INT16ARRAY = "si16";
var TYPE_INT32ARRAY = "si32";
var TYPE_UINT16ARRAY = "ur16";
var TYPE_UINT32ARRAY = "ui32";
var TYPE_FLOAT32ARRAY = "fl32";
var TYPE_FLOAT64ARRAY = "fl64";
var TYPE_SERIALIZED_MARKER_LENGTH = SERIALIZED_MARKER_LENGTH + TYPE_ARRAYBUFFER.length;
var toString$1 = Object.prototype.toString;
function stringToBuffer(serializedString) {
// Fill the string into a ArrayBuffer.
var bufferLength = serializedString.length * .75;
var len = serializedString.length;
var i;
var p = 0;
var encoded1, encoded2, encoded3, encoded4;
if (serializedString[serializedString.length - 1] === "=") {
bufferLength--;
if (serializedString[serializedString.length - 2] === "=") {
bufferLength--;
}
}
var buffer = new ArrayBuffer(bufferLength);
var bytes = new Uint8Array(buffer);
for (i = 0; i < len; i += 4) {
encoded1 = BASE_CHARS.indexOf(serializedString[i]);
encoded2 = BASE_CHARS.indexOf(serializedString[i + 1]);
encoded3 = BASE_CHARS.indexOf(serializedString[i + 2]);
encoded4 = BASE_CHARS.indexOf(serializedString[i + 3]);
/*jslint bitwise: true */
bytes[p++] = encoded1 << 2 | encoded2 >> 4;
bytes[p++] = (encoded2 & 15) << 4 | encoded3 >> 2;
bytes[p++] = (encoded3 & 3) << 6 | encoded4 & 63;
}
return buffer;
}
// Converts a buffer to a string to store, serialized, in the backend
// storage library.
function bufferToString(buffer) {
// base64-arraybuffer
var bytes = new Uint8Array(buffer);
var base64String = "";
var i;
for (i = 0; i < bytes.length; i += 3) {
/*jslint bitwise: true */
base64String += BASE_CHARS[bytes[i] >> 2];
base64String += BASE_CHARS[(bytes[i] & 3) << 4 | bytes[i + 1] >> 4];
base64String += BASE_CHARS[(bytes[i + 1] & 15) << 2 | bytes[i + 2] >> 6];
base64String += BASE_CHARS[bytes[i + 2] & 63];
}
if (bytes.length % 3 === 2) {
base64String = base64String.substring(0, base64String.length - 1) + "=";
} else if (bytes.length % 3 === 1) {
base64String = base64String.substring(0, base64String.length - 2) + "==";
}
return base64String;
}
// Serialize a value, afterwards executing a callback (which usually
// instructs the `setItem()` callback/promise to be executed). This is how
// we store binary data with localStorage.
function serialize(value, callback) {
var valueType = "";
if (value) {
valueType = toString$1.call(value);
}
// Cannot use `value instanceof ArrayBuffer` or such here, as these
// checks fail when running the tests using casper.js...
//
// TODO: See why those tests fail and use a better solution.
if (value && (valueType === "[object ArrayBuffer]" || value.buffer && toString$1.call(value.buffer) === "[object ArrayBuffer]")) {
// Convert binary arrays to a string and prefix the string with
// a special marker.
var buffer;
var marker = SERIALIZED_MARKER;
if (value instanceof ArrayBuffer) {
buffer = value;
marker += TYPE_ARRAYBUFFER;
} else {
buffer = value.buffer;
if (valueType === "[object Int8Array]") {
marker += TYPE_INT8ARRAY;
} else if (valueType === "[object Uint8Array]") {
marker += TYPE_UINT8ARRAY;
} else if (valueType === "[object Uint8ClampedArray]") {
marker += TYPE_UINT8CLAMPEDARRAY;
} else if (valueType === "[object Int16Array]") {
marker += TYPE_INT16ARRAY;
} else if (valueType === "[object Uint16Array]") {
marker += TYPE_UINT16ARRAY;
} else if (valueType === "[object Int32Array]") {
marker += TYPE_INT32ARRAY;
} else if (valueType === "[object Uint32Array]") {
marker += TYPE_UINT32ARRAY;
} else if (valueType === "[object Float32Array]") {
marker += TYPE_FLOAT32ARRAY;
} else if (valueType === "[object Float64Array]") {
marker += TYPE_FLOAT64ARRAY;
} else {
callback(new Error("Failed to get type for BinaryArray"));
}
}
callback(marker + bufferToString(buffer));
} else if (valueType === "[object Blob]") {
// Conver the blob to a binaryArray and then to a string.
var fileReader = new FileReader();
fileReader.onload = function() {
// Backwards-compatible prefix for the blob type.
var str = BLOB_TYPE_PREFIX + value.type + "~" + bufferToString(this.result);
callback(SERIALIZED_MARKER + TYPE_BLOB + str);
};
fileReader.readAsArrayBuffer(value);
} else {
try {
callback(JSON.stringify(value));
} catch (e) {
console.error("Couldn't convert value into a JSON string: ", value);
callback(null, e);
}
}
}
// Deserialize data we've inserted into a value column/field. We place
// special markers into our strings to mark them as encoded; this isn't
// as nice as a meta field, but it's the only sane thing we can do whilst
// keeping localStorage support intact.
//
// Oftentimes this will just deserialize JSON content, but if we have a
// special marker (SERIALIZED_MARKER, defined above), we will extract
// some kind of arraybuffer/binary data/typed array out of the string.
function deserialize(value) {
// If we haven't marked this string as being specially serialized (i.e.
// something other than serialized JSON), we can just return it and be
// done with it.
if (value.substring(0, SERIALIZED_MARKER_LENGTH) !== SERIALIZED_MARKER) {
return JSON.parse(value);
}
// The following code deals with deserializing some kind of Blob or
// TypedArray. First we separate out the type of data we're dealing
// with from the data itself.
var serializedString = value.substring(TYPE_SERIALIZED_MARKER_LENGTH);
var type = value.substring(SERIALIZED_MARKER_LENGTH, TYPE_SERIALIZED_MARKER_LENGTH);
var blobType;
// Backwards-compatible blob type serialization strategy.
// DBs created with older versions of localForage will simply not have the blob type.
if (type === TYPE_BLOB && BLOB_TYPE_PREFIX_REGEX.test(serializedString)) {
var matcher = serializedString.match(BLOB_TYPE_PREFIX_REGEX);
blobType = matcher[1];
serializedString = serializedString.substring(matcher[0].length);
}
var buffer = stringToBuffer(serializedString);
// Return the right type based on the code/type set during
// serialization.
switch (type) {
case TYPE_ARRAYBUFFER:
return buffer;
case TYPE_BLOB:
return createBlob([buffer], {
type: blobType
});
case TYPE_INT8ARRAY:
return new Int8Array(buffer);
case TYPE_UINT8ARRAY:
return new Uint8Array(buffer);
case TYPE_UINT8CLAMPEDARRAY:
return new Uint8ClampedArray(buffer);
case TYPE_INT16ARRAY:
return new Int16Array(buffer);
case TYPE_UINT16ARRAY:
return new Uint16Array(buffer);
case TYPE_INT32ARRAY:
return new Int32Array(buffer);
case TYPE_UINT32ARRAY:
return new Uint32Array(buffer);
case TYPE_FLOAT32ARRAY:
return new Float32Array(buffer);
case TYPE_FLOAT64ARRAY:
return new Float64Array(buffer);
default:
throw new Error("Unkown type: " + type);
}
}
var localforageSerializer = {
serialize: serialize,
deserialize: deserialize,
stringToBuffer: stringToBuffer,
bufferToString: bufferToString
};
/*
* Includes code from:
*
* base64-arraybuffer
* https://github.com/niklasvh/base64-arraybuffer
*
* Copyright (c) 2012 Niklas von Hertzen
* Licensed under the MIT license.
*/
function createDbTable(t, dbInfo, callback, errorCallback) {
t.executeSql("CREATE TABLE IF NOT EXISTS " + dbInfo.storeName + " " + "(id INTEGER PRIMARY KEY, key unique, value)", [], callback, errorCallback);
}
// Open the WebSQL database (automatically creates one if one didn't
// previously exist), using any options set in the config.
function _initStorage$1(options) {
var self = this;
var dbInfo = {
db: null
};
if (options) {
for (var i in options) {
dbInfo[i] = typeof options[i] !== "string" ? options[i].toString() : options[i];
}
}
var dbInfoPromise = new Promise$1(function(resolve, reject) {
// Open the database; the openDatabase API will automatically
// create it for us if it doesn't exist.
try {
dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version), dbInfo.description, dbInfo.size);
} catch (e) {
return reject(e);
}
// Create our key/value table if it doesn't exist.
dbInfo.db.transaction(function(t) {
createDbTable(t, dbInfo, function() {
self._dbInfo = dbInfo;
resolve();
}, function(t, error) {
reject(error);
});
}, reject);
});
dbInfo.serializer = localforageSerializer;
return dbInfoPromise;
}
function tryExecuteSql(t, dbInfo, sqlStatement, args, callback, errorCallback) {
t.executeSql(sqlStatement, args, callback, function(t, error) {
if (error.code === error.SYNTAX_ERR) {
t.executeSql("SELECT name FROM sqlite_master " + "WHERE type='table' AND name = ?", [dbInfo.storeName], function(t, results) {
if (!results.rows.length) {
// if the table is missing (was deleted)
// re-create it table and retry
createDbTable(t, dbInfo, function() {
t.executeSql(sqlStatement, args, callback, errorCallback);
}, errorCallback);
} else {
errorCallback(t, error);
}
}, errorCallback);
} else {
errorCallback(t, error);
}
}, errorCallback);
}
function getItem$1(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "SELECT * FROM " + dbInfo.storeName + " WHERE key = ? LIMIT 1", [key], function(t, results) {
var result = results.rows.length ? results.rows.item(0).value : null;
// Check to see if this is serialized content we need to
// unpack.
if (result) {
result = dbInfo.serializer.deserialize(result);
}
resolve(result);
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function iterate$1(iterator, callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "SELECT * FROM " + dbInfo.storeName, [], function(t, results) {
var rows = results.rows;
var length = rows.length;
for (var i = 0; i < length; i++) {
var item = rows.item(i);
var result = item.value;
// Check to see if this is serialized content
// we need to unpack.
if (result) {
result = dbInfo.serializer.deserialize(result);
}
result = iterator(result, item.key, i + 1);
// void(0) prevents problems with redefinition
// of `undefined`.
if (result !== void 0) {
resolve(result);
return;
}
}
resolve();
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function _setItem(key, value, callback, retriesLeft) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
// The localStorage API doesn't return undefined values in an
// "expected" way, so undefined is always cast to null in all
// drivers. See: https://github.com/mozilla/localForage/pull/42
if (value === undefined) {
value = null;
}
// Save the original value to pass to the callback.
var originalValue = value;
var dbInfo = self._dbInfo;
dbInfo.serializer.serialize(value, function(value, error) {
if (error) {
reject(error);
} else {
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "INSERT OR REPLACE INTO " + dbInfo.storeName + " " + "(key, value) VALUES (?, ?)", [key, value], function() {
resolve(originalValue);
}, function(t, error) {
reject(error);
});
}, function(sqlError) {
// The transaction failed; check
// to see if it's a quota error.
if (sqlError.code === sqlError.QUOTA_ERR) {
// We reject the callback outright for now, but
// it's worth trying to re-run the transaction.
// Even if the user accepts the prompt to use
// more storage on Safari, this error will
// be called.
//
// Try to re-run the transaction.
if (retriesLeft > 0) {
resolve(_setItem.apply(self, [key, originalValue, callback, retriesLeft - 1]));
return;
}
reject(sqlError);
}
});
}
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function setItem$1(key, value, callback) {
return _setItem.apply(this, [key, value, callback, 1]);
}
function removeItem$1(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "DELETE FROM " + dbInfo.storeName + " WHERE key = ?", [key], function() {
resolve();
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
// Deletes every item in the table.
// TODO: Find out if this resets the AUTO_INCREMENT number.
function clear$1(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "DELETE FROM " + dbInfo.storeName, [], function() {
resolve();
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
// Does a simple `COUNT(key)` to get the number of items stored in
// localForage.
function length$1(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
// Ahhh, SQL makes this one soooooo easy.
tryExecuteSql(t, dbInfo, "SELECT COUNT(key) as c FROM " + dbInfo.storeName, [], function(t, results) {
var result = results.rows.item(0).c;
resolve(result);
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
// Return the key located at key index X; essentially gets the key from a
// `WHERE id = ?`. This is the most efficient way I can think to implement
// this rarely-used (in my experience) part of the API, but it can seem
// inconsistent, because we do `INSERT OR REPLACE INTO` on `setItem()`, so
// the ID of each key will change every time it's updated. Perhaps a stored
// procedure for the `setItem()` SQL would solve this problem?
// TODO: Don't change ID on `setItem()`.
function key$1(n, callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "SELECT key FROM " + dbInfo.storeName + " WHERE id = ? LIMIT 1", [n + 1], function(t, results) {
var result = results.rows.length ? results.rows.item(0).key : null;
resolve(result);
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
function keys$1(callback) {
var self = this;
var promise = new Promise$1(function(resolve, reject) {
self.ready().then(function() {
var dbInfo = self._dbInfo;
dbInfo.db.transaction(function(t) {
tryExecuteSql(t, dbInfo, "SELECT key FROM " + dbInfo.storeName, [], function(t, results) {
var keys = [];
for (var i = 0; i < results.rows.length; i++) {
keys.push(results.rows.item(i).key);
}
resolve(keys);
}, function(t, error) {
reject(error);
});
});
})["catch"](reject);
});
executeCallback(promise, callback);
return promise;
}
// https://www.w3.org/TR/webdatabase/#databases
// > There is no way to enumerate or delete the databases available for an origin from this API.
function getAllStoreNames(db) {
return new Promise$1(function(resolve, reject) {
db.transaction(function(t) {
t.executeSql("SELECT name FROM sqlite_master " + "WHERE type='table' AND name <> '__WebKitDatabaseInfoTable__'", [], function(t, results) {
var storeNames = [];
for (var i = 0; i < results.rows.length; i++) {
storeNames.push(results.rows.item(i).name);
}
resolve({
db: db,
storeNames: storeNames
});
}, function(t, error) {
reject(error);
});
}, function(sqlError) {
reject(sqlError);
});
});
}
function dropInstance$1(options, callback) {
callback = getCallback.apply(this, arguments);
var currentConfig = this.config();
options = typeof options !== "function" && options || {};
if (!options.name) {
options.name = options.name || currentConfig.name;
options.storeName = options.storeName || currentConfig.storeName;
}
var self = this;
var promise;
if (!options.name) {
promise = Promise$1.reject("Invalid arguments");
} else {
promise = new Promise$1(function(resolve) {
var db;
if (options.name === currentConfig.name) {
// use the db reference of the current instance
db = self._dbInfo.db;
} else {
db = openDatabase(options.name, "", "", 0);
}
if (!options.storeName) {
// drop all database tables
resolve(getAllStoreNames(db));
} else {
resolve({
db: db,
storeNames: [options.storeName]
});
}
}).then(function(operationInfo) {
return new Promise$1(function(resolve, reject) {
operationInfo.db.transaction(function(t) {
function dropTable(storeName) {
return new Promise$1(function(resolve, reject) {
t.executeSql("DROP TABLE IF EXISTS " + storeName, [], function() {
resolve();
}, function(t, error) {
reject(error);
});
});
}
var operations = [];
for (var i = 0, len = operationInfo.storeNames.length; i < len; i++) {
operations.push(dropTable(operationInfo.storeNames[i]));
}
Promise$1.all(operations).then(function() {
resolve();
})["catch"](function(e) {
reject(e);
});
}, function(sqlError) {
reject(sqlError);
});
});
});
}
executeCallback(promise, callback);
return promise;
}
var webSQLStorage = {
_driver: "webSQLStorage",
_initStorage: _initStorage$1,
_support: isWebSQLValid(),
iterate: iterate$1,
getItem: getItem$1,
setItem: setItem$1,
removeItem: removeItem$1,
clear: clear$1,
length: length$1,
key: key$1,
keys: keys$1,
dropInstance: dropInstance$1
};
function isLocalStorageValid() {
try {
return typeof localStorage !== "undefined" && "setItem" in localStorage && // in IE8 typeof localStorage.setItem === 'object'
!!localStorage.setItem;
} catch (e) {
return false;
}
}
function _getKeyPrefix(options, defaultConfig) {
var keyPrefix = options.name + "/";
if (options.storeName !== defaultConfig.storeName) {
keyPrefix += options.storeName + "/";
}
return keyPrefix;
}
// Check if localStorage throws when saving an item
function checkIfLocalStorageThrows() {
var localStorageTestKey = "_localforage_support_test";
try {
localStorage.setItem(localStorageTestKey, true);
localStorage.removeItem(localStorageTestKey);
return false;
} catch (e) {
return true;
}
}
// Check if localStorage is usable and allows to save an item
// This method checks if localStorage is usable in Safari Private Browsing
// mode, or in any other case where the available quota for localStorage
// is 0 and there wasn't any saved items yet.
function _isLocalStorageUsable() {
return !checkIfLocalStorageThrows() || localStorage.length > 0;
}
// Config the localStorage backend, using options set in the config.
function _initStorage$2(options) {
var self = this;
var dbInfo = {};
if (options) {
for (var i in options) {
dbInfo[i] = options[i];
}
}
dbInfo.keyPrefix = _getKeyPrefix(options, self._defaultConfig);
if (!_isLocalStorageUsable()) {
return Promise$1.reject();
}
self._dbInfo = dbInfo;
dbInfo.serializer = localforageSerializer;
return Promise$1.resolve();
}
// Remove all keys from the datastore, effectively destroying all data in
// the app's key/value store!
function clear$2(callback) {
var self = this;
var promise = self.ready().then(function() {
var keyPrefix = self._dbInfo.keyPrefix;
for (var i = localStorage.length - 1; i >= 0; i--) {
var key = localStorage.key(i);
if (key.indexOf(keyPrefix) === 0) {
localStorage.removeItem(key);
}
}
});
executeCallback(promise, callback);
return promise;
}
// Retrieve an item from the store. Unlike the original async_storage
// library in Gaia, we don't modify return values at all. If a key's value
// is `undefined`, we pass that value to the callback function.
function getItem$2(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = self.ready().then(function() {
var dbInfo = self._dbInfo;
var result = localStorage.getItem(dbInfo.keyPrefix + key);
// If a result was found, parse it from the serialized
// string into a JS object. If result isn't truthy, the key
// is likely undefined and we'll pass it straight to the
// callback.
if (result) {
result = dbInfo.serializer.deserialize(result);
}
return result;
});
executeCallback(promise, callback);
return promise;
}
// Iterate over all items in the store.
function iterate$2(iterator, callback) {
var self = this;
var promise = self.ready().then(function() {
var dbInfo = self._dbInfo;
var keyPrefix = dbInfo.keyPrefix;
var keyPrefixLength = keyPrefix.length;
var length = localStorage.length;
// We use a dedicated iterator instead of the `i` variable below
// so other keys we fetch in localStorage aren't counted in
// the `iterationNumber` argument passed to the `iterate()`
// callback.
//
// See: github.com/mozilla/localForage/pull/435#discussion_r38061530
var iterationNumber = 1;
for (var i = 0; i < length; i++) {
var key = localStorage.key(i);
if (key.indexOf(keyPrefix) !== 0) {
continue;
}
var value = localStorage.getItem(key);
// If a result was found, parse it from the serialized
// string into a JS object. If result isn't truthy, the
// key is likely undefined and we'll pass it straight
// to the iterator.
if (value) {
value = dbInfo.serializer.deserialize(value);
}
value = iterator(value, key.substring(keyPrefixLength), iterationNumber++);
if (value !== void 0) {
return value;
}
}
});
executeCallback(promise, callback);
return promise;
}
// Same as localStorage's key() method, except takes a callback.
function key$2(n, callback) {
var self = this;
var promise = self.ready().then(function() {
var dbInfo = self._dbInfo;
var result;
try {
result = localStorage.key(n);
} catch (error) {
result = null;
}
// Remove the prefix from the key, if a key is found.
if (result) {
result = result.substring(dbInfo.keyPrefix.length);
}
return result;
});
executeCallback(promise, callback);
return promise;
}
function keys$2(callback) {
var self = this;
var promise = self.ready().then(function() {
var dbInfo = self._dbInfo;
var length = localStorage.length;
var keys = [];
for (var i = 0; i < length; i++) {
var itemKey = localStorage.key(i);
if (itemKey.indexOf(dbInfo.keyPrefix) === 0) {
keys.push(itemKey.substring(dbInfo.keyPrefix.length));
}
}
return keys;
});
executeCallback(promise, callback);
return promise;
}
// Supply the number of keys in the datastore to the callback function.
function length$2(callback) {
var self = this;
var promise = self.keys().then(function(keys) {
return keys.length;
});
executeCallback(promise, callback);
return promise;
}
// Remove an item from the store, nice and simple.
function removeItem$2(key, callback) {
var self = this;
key = normalizeKey(key);
var promise = self.ready().then(function() {
var dbInfo = self._dbInfo;
localStorage.removeItem(dbInfo.keyPrefix + key);
});
executeCallback(promise, callback);
return promise;
}
// Set a key's value and run an optional callback once the value is set.
// Unlike Gaia's implementation, the callback function is passed the value,
// in case you want to operate on that value only after you're sure it
// saved, or something like that.
function setItem$2(key, value, callback) {
var self = this;
key = normalizeKey(key);
var promise = self.ready().then(function() {
// Convert undefined values to null.
// https://github.com/mozilla/localForage/pull/42
if (value === undefined) {
value = null;
}
// Save the original value to pass to the callback.
var originalValue = value;
return new Promise$1(function(resolve, reject) {
var dbInfo = self._dbInfo;
dbInfo.serializer.serialize(value, function(value, error) {
if (error) {
reject(error);
} else {
try {
localStorage.setItem(dbInfo.keyPrefix + key, value);
resolve(originalValue);
} catch (e) {
// localStorage capacity exceeded.
// TODO: Make this a specific error/event.
if (e.name === "QuotaExceededError" || e.name === "NS_ERROR_DOM_QUOTA_REACHED") {
reject(e);
}
reject(e);
}
}
});
});
});
executeCallback(promise, callback);
return promise;
}
function dropInstance$2(options, callback) {
callback = getCallback.apply(this, arguments);
options = typeof options !== "function" && options || {};
if (!options.name) {
var currentConfig = this.config();
options.name = options.name || currentConfig.name;
options.storeName = options.storeName || currentConfig.storeName;
}
var self = this;
var promise;
if (!options.name) {
promise = Promise$1.reject("Invalid arguments");
} else {
promise = new Promise$1(function(resolve) {
if (!options.storeName) {
resolve(options.name + "/");
} else {
resolve(_getKeyPrefix(options, self._defaultConfig));
}
}).then(function(keyPrefix) {
for (var i = localStorage.length - 1; i >= 0; i--) {
var key = localStorage.key(i);
if (key.indexOf(keyPrefix) === 0) {
localStorage.removeItem(key);
}
}
});
}
executeCallback(promise, callback);
return promise;
}
var localStorageWrapper = {
_driver: "localStorageWrapper",
_initStorage: _initStorage$2,
_support: isLocalStorageValid(),
iterate: iterate$2,
getItem: getItem$2,
setItem: setItem$2,
removeItem: removeItem$2,
clear: clear$2,
length: length$2,
key: key$2,
keys: keys$2,
dropInstance: dropInstance$2
};
var sameValue = function sameValue(x, y) {
return x === y || typeof x === "number" && typeof y === "number" && isNaN(x) && isNaN(y);
};
var includes = function includes(array, searchElement) {
var len = array.length;
var i = 0;
while (i < len) {
if (sameValue(array[i], searchElement)) {
return true;
}
i++;
}
return false;
};
var isArray = Array.isArray || function(arg) {
return Object.prototype.toString.call(arg) === "[object Array]";
};
// Drivers are stored here when `defineDriver()` is called.
// They are shared across all instances of localForage.
var DefinedDrivers = {};
var DriverSupport = {};
var DefaultDrivers = {
INDEXEDDB: asyncStorage,
WEBSQL: webSQLStorage,
LOCALSTORAGE: localStorageWrapper
};
var DefaultDriverOrder = [DefaultDrivers.INDEXEDDB._driver, DefaultDrivers.WEBSQL._driver, DefaultDrivers.LOCALSTORAGE._driver];
var OptionalDriverMethods = ["dropInstance"];
var LibraryMethods = ["clear", "getItem", "iterate", "key", "keys", "length", "removeItem", "setItem"].concat(OptionalDriverMethods);
var DefaultConfig = {
description: "",
driver: DefaultDriverOrder.slice(),
name: "localforage",
// Default DB size is _JUST UNDER_ 5MB, as it's the highest size
// we can use without a prompt.
size: 4980736,
storeName: "keyvaluepairs",
version: 1
};
function callWhenReady(localForageInstance, libraryMethod) {
localForageInstance[libraryMethod] = function() {
var _args = arguments;
return localForageInstance.ready().then(function() {
return localForageInstance[libraryMethod].apply(localForageInstance, _args);
});
};
}
function extend() {
for (var i = 1; i < arguments.length; i++) {
var arg = arguments[i];
if (arg) {
for (var _key in arg) {
if (arg.hasOwnProperty(_key)) {
if (isArray(arg[_key])) {
arguments[0][_key] = arg[_key].slice();
} else {
arguments[0][_key] = arg[_key];
}
}
}
}
}
return arguments[0];
}
var LocalForage = function() {
function LocalForage(options) {
_classCallCheck(this, LocalForage);
for (var driverTypeKey in DefaultDrivers) {
if (DefaultDrivers.hasOwnProperty(driverTypeKey)) {
var driver = DefaultDrivers[driverTypeKey];
var driverName = driver._driver;
this[driverTypeKey] = driverName;
if (!DefinedDrivers[driverName]) {
// we don't need to wait for the promise,
// since the default drivers can be defined
// in a blocking manner
this.defineDriver(driver);
}
}
}
this._defaultConfig = extend({}, DefaultConfig);
this._config = extend({}, this._defaultConfig, options);
this._driverSet = null;
this._initDriver = null;
this._ready = false;
this._dbInfo = null;
this._wrapLibraryMethodsWithReady();
this.setDriver(this._config.driver)["catch"](function() {});
}
// Set any config values for localForage; can be called anytime before
// the first API call (e.g. `getItem`, `setItem`).
// We loop through options so we don't overwrite existing config
// values.
LocalForage.prototype.config = function config(options) {
// If the options argument is an object, we use it to set values.
// Otherwise, we return either a specified config value or all
// config values.
if ((typeof options === "undefined" ? "undefined" : _typeof(options)) === "object") {
// If localforage is ready and fully initialized, we can't set
// any new configuration values. Instead, we return an error.
if (this._ready) {
return new Error("Can't call config() after localforage " + "has been used.");
}
for (var i in options) {
if (i === "storeName") {
options[i] = options[i].replace(/\W/g, "_");
}
if (i === "version" && typeof options[i] !== "number") {
return new Error("Database version must be a number.");
}
this._config[i] = options[i];
}
// after all config options are set and
// the driver option is used, try setting it
if ("driver" in options && options.driver) {
return this.setDriver(this._config.driver);
}
return true;
} else if (typeof options === "string") {
return this._config[options];
} else {
return this._config;
}
};
// Used to define a custom driver, shared across all instances of
// localForage.
LocalForage.prototype.defineDriver = function defineDriver(driverObject, callback, errorCallback) {
var promise = new Promise$1(function(resolve, reject) {
try {
var driverName = driverObject._driver;
var complianceError = new Error("Custom driver not compliant; see " + "https://mozilla.github.io/localForage/#definedriver");
// A driver name should be defined and not overlap with the
// library-defined, default drivers.
if (!driverObject._driver) {
reject(complianceError);
return;
}
var driverMethods = LibraryMethods.concat("_initStorage");
for (var i = 0, len = driverMethods.length; i < len; i++) {
var driverMethodName = driverMethods[i];
// when the property is there,
// it should be a method even when optional
var isRequired = !includes(OptionalDriverMethods, driverMethodName);
if ((isRequired || driverObject[driverMethodName]) && typeof driverObject[driverMethodName] !== "function") {
reject(complianceError);
return;
}
}
var configureMissingMethods = function configureMissingMethods() {
var methodNotImplementedFactory = function methodNotImplementedFactory(methodName) {
return function() {
var error = new Error("Method " + methodName + " is not implemented by the current driver");
var promise = Promise$1.reject(error);
executeCallback(promise, arguments[arguments.length - 1]);
return promise;
};
};
for (var _i = 0, _len = OptionalDriverMethods.length; _i < _len; _i++) {
var optionalDriverMethod = OptionalDriverMethods[_i];
if (!driverObject[optionalDriverMethod]) {
driverObject[optionalDriverMethod] = methodNotImplementedFactory(optionalDriverMethod);
}
}
};
configureMissingMethods();
var setDriverSupport = function setDriverSupport(support) {
if (DefinedDrivers[driverName]) {
console.info("Redefining LocalForage driver: " + driverName);
}
DefinedDrivers[driverName] = driverObject;
DriverSupport[driverName] = support;
// don't use a then, so that we can define
// drivers that have simple _support methods
// in a blocking manner
resolve();
};
if ("_support" in driverObject) {
if (driverObject._support && typeof driverObject._support === "function") {
driverObject._support().then(setDriverSupport, reject);
} else {
setDriverSupport(!!driverObject._support);
}
} else {
setDriverSupport(true);
}
} catch (e) {
reject(e);
}
});
executeTwoCallbacks(promise, callback, errorCallback);
return promise;
};
LocalForage.prototype.driver = function driver() {
return this._driver || null;
};
LocalForage.prototype.getDriver = function getDriver(driverName, callback, errorCallback) {
var getDriverPromise = DefinedDrivers[driverName] ? Promise$1.resolve(DefinedDrivers[driverName]) : Promise$1.reject(new Error("Driver not found."));
executeTwoCallbacks(getDriverPromise, callback, errorCallback);
return getDriverPromise;
};
LocalForage.prototype.getSerializer = function getSerializer(callback) {
var serializerPromise = Promise$1.resolve(localforageSerializer);
executeTwoCallbacks(serializerPromise, callback);
return serializerPromise;
};
LocalForage.prototype.ready = function ready(callback) {
var self = this;
var promise = self._driverSet.then(function() {
if (self._ready === null) {
self._ready = self._initDriver();
}
return self._ready;
});
executeTwoCallbacks(promise, callback, callback);
return promise;
};
LocalForage.prototype.setDriver = function setDriver(drivers, callback, errorCallback) {
var self = this;
if (!isArray(drivers)) {
drivers = [drivers];
}
var supportedDrivers = this._getSupportedDrivers(drivers);
function setDriverToConfig() {
self._config.driver = self.driver();
}
function extendSelfWithDriver(driver) {
self._extend(driver);
setDriverToConfig();
self._ready = self._initStorage(self._config);
return self._ready;
}
function initDriver(supportedDrivers) {
return function() {
var currentDriverIndex = 0;
function driverPromiseLoop() {
while (currentDriverIndex < supportedDrivers.length) {
var driverName = supportedDrivers[currentDriverIndex];
currentDriverIndex++;
self._dbInfo = null;
self._ready = null;
return self.getDriver(driverName).then(extendSelfWithDriver)["catch"](driverPromiseLoop);
}
setDriverToConfig();
var error = new Error("No available storage method found.");
self._driverSet = Promise$1.reject(error);
return self._driverSet;
}
return driverPromiseLoop();
};
}
// There might be a driver initialization in progress
// so wait for it to finish in order to avoid a possible
// race condition to set _dbInfo
var oldDriverSetDone = this._driverSet !== null ? this._driverSet["catch"](function() {
return Promise$1.resolve();
}) : Promise$1.resolve();
this._driverSet = oldDriverSetDone.then(function() {
var driverName = supportedDrivers[0];
self._dbInfo = null;
self._ready = null;
return self.getDriver(driverName).then(function(driver) {
self._driver = driver._driver;
setDriverToConfig();
self._wrapLibraryMethodsWithReady();
self._initDriver = initDriver(supportedDrivers);
});
})["catch"](function() {
setDriverToConfig();
var error = new Error("No available storage method found.");
self._driverSet = Promise$1.reject(error);
return self._driverSet;
});
executeTwoCallbacks(this._driverSet, callback, errorCallback);
return this._driverSet;
};
LocalForage.prototype.supports = function supports(driverName) {
return !!DriverSupport[driverName];
};
LocalForage.prototype._extend = function _extend(libraryMethodsAndProperties) {
extend(this, libraryMethodsAndProperties);
};
LocalForage.prototype._getSupportedDrivers = function _getSupportedDrivers(drivers) {
var supportedDrivers = [];
for (var i = 0, len = drivers.length; i < len; i++) {
var driverName = drivers[i];
if (this.supports(driverName)) {
supportedDrivers.push(driverName);
}
}
return supportedDrivers;
};
LocalForage.prototype._wrapLibraryMethodsWithReady = function _wrapLibraryMethodsWithReady() {
// Add a stub for each driver API method that delays the call to the
// corresponding driver method until localForage is ready. These stubs
// will be replaced by the driver methods as soon as the driver is
// loaded, so there is no performance impact.
for (var i = 0, len = LibraryMethods.length; i < len; i++) {
callWhenReady(this, LibraryMethods[i]);
}
};
LocalForage.prototype.createInstance = function createInstance(options) {
return new LocalForage(options);
};
return LocalForage;
}();
// The actual localForage object that we expose as a module or via a
// global. It's extended by pulling in one of our other libraries.
var localforage_js = new LocalForage();
module.exports = localforage_js;
}, {
"3": 3
}]
}, {}, [4])(4);
});
