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[GNUnet-SVN] [taler-wallet-webex] 01/07: idb wip
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From: |
gnunet |
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Subject: |
[GNUnet-SVN] [taler-wallet-webex] 01/07: idb wip |
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Date: |
Tue, 25 Jun 2019 14:31:56 +0200 |
This is an automated email from the git hooks/post-receive script.
dold pushed a commit to branch master
in repository wallet-webex.
commit 2ee9431f1ba5bf67546bbf85758a01991c40673f
Author: Florian Dold <address@hidden>
AuthorDate: Sat Jun 15 22:44:54 2019 +0200
idb wip
---
packages/idb-bridge/.prettierrc | 6 +
packages/idb-bridge/README.md | 18 +
packages/idb-bridge/package.json | 19 +
packages/idb-bridge/src/BridgeIDBCursor.ts | 315 ++
.../idb-bridge/src/BridgeIDBCursorWithValue.ts | 44 +
packages/idb-bridge/src/BridgeIDBDatabase.ts | 239 ++
packages/idb-bridge/src/BridgeIDBFactory.ts | 192 ++
packages/idb-bridge/src/BridgeIDBIndex.ts | 316 ++
packages/idb-bridge/src/BridgeIDBKeyRange.ts | 133 +
packages/idb-bridge/src/BridgeIDBObjectStore.ts | 441 +++
packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts | 36 +
packages/idb-bridge/src/BridgeIDBRequest.ts | 86 +
packages/idb-bridge/src/BridgeIDBTransaction.ts | 301 ++
.../idb-bridge/src/BridgeIDBVersionChangeEvent.ts | 41 +
packages/idb-bridge/src/MemoryBackend.test.ts | 31 +
packages/idb-bridge/src/MemoryBackend.ts | 662 ++++
packages/idb-bridge/src/backend-interface.ts | 145 +
packages/idb-bridge/src/tree/b+tree.ts | 1351 ++++++++
packages/idb-bridge/src/tree/interfaces.ts | 329 ++
packages/idb-bridge/src/util/FakeEvent.ts | 80 +
packages/idb-bridge/src/util/FakeEventTarget.ts | 177 +
packages/idb-bridge/src/util/canInjectKey.ts | 34 +
packages/idb-bridge/src/util/cmp.ts | 108 +
packages/idb-bridge/src/util/deepEquals.ts | 75 +
packages/idb-bridge/src/util/enforceRange.ts | 18 +
packages/idb-bridge/src/util/errors.ts | 120 +
packages/idb-bridge/src/util/extractKey.ts | 55 +
packages/idb-bridge/src/util/fakeDOMStringList.ts | 37 +
packages/idb-bridge/src/util/injectKey.ts | 48 +
packages/idb-bridge/src/util/makeStoreKeyValue.ts | 92 +
packages/idb-bridge/src/util/openPromise.ts | 22 +
packages/idb-bridge/src/util/queueTask.ts | 21 +
packages/idb-bridge/src/util/structuredClone.ts | 15 +
packages/idb-bridge/src/util/types.ts | 73 +
packages/idb-bridge/src/util/validateKeyPath.ts | 77 +
packages/idb-bridge/src/util/valueToKey.ts | 70 +
packages/idb-bridge/tsconfig.json | 14 +
packages/idb-bridge/yarn.lock | 3626 ++++++++++++++++++++
38 files changed, 9467 insertions(+)
diff --git a/packages/idb-bridge/.prettierrc b/packages/idb-bridge/.prettierrc
new file mode 100644
index 00000000..50063da9
--- /dev/null
+++ b/packages/idb-bridge/.prettierrc
@@ -0,0 +1,6 @@
+{
+ "trailingComma": "all",
+ "tabWidth": 2,
+ "semi": true,
+ "singleQuote": false
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/README.md b/packages/idb-bridge/README.md
new file mode 100644
index 00000000..9298f292
--- /dev/null
+++ b/packages/idb-bridge/README.md
@@ -0,0 +1,18 @@
+# idb-bridge
+
+The `idb-bridge` package implements the IndexedDB API with multiple backends.
+
+Currently available backends are:
+ * sqlite: A SQLite3 database. Can be backed by a file or in memory.
+ * memdb: An unoptimized in-memory storage backend. Useful for environments
+ that do not have sqlite.
+
+## Known Issues
+
+IndexedDB assumes that after a database has been opened, the set of object
stores and indices does not change,
+even when there is no transaction active. We cannot guarantee this with
SQLite.
+
+## Acknowledgements
+
+This library is based on the fakeIndexedDB library
+(https://github.com/dumbmatter/fakeIndexedDB).
\ No newline at end of file
diff --git a/packages/idb-bridge/package.json b/packages/idb-bridge/package.json
new file mode 100644
index 00000000..4279bb3a
--- /dev/null
+++ b/packages/idb-bridge/package.json
@@ -0,0 +1,19 @@
+{
+ "name": "idb-bridge",
+ "version": "0.0.1",
+ "description": "IndexedDB implementation that uses SQLite3 as storage",
+ "main": "index.js",
+ "author": "Florian Dold",
+ "license": "AGPL-3.0-or-later",
+ "private": false,
+ "dependencies": {
+ "sqlite3": "^4.0.8"
+ },
+ "scripts": {
+ "test": "tsc && ava"
+ },
+ "devDependencies": {
+ "ava": "^1.4.1",
+ "typescript": "^3.4.5"
+ }
+}
diff --git a/packages/idb-bridge/src/BridgeIDBCursor.ts
b/packages/idb-bridge/src/BridgeIDBCursor.ts
new file mode 100644
index 00000000..0120bb7d
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBCursor.ts
@@ -0,0 +1,315 @@
+/*
+ Copyright 2019 Florian Dold
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import cmp from "./util/cmp";
+import {
+ DataError,
+ InvalidAccessError,
+ InvalidStateError,
+ ReadOnlyError,
+ TransactionInactiveError,
+} from "./util/errors";
+import extractKey from "./util/extractKey";
+import structuredClone from "./util/structuredClone";
+import {
+ CursorRange,
+ CursorSource,
+ Key,
+ Value,
+ BridgeIDBCursorDirection,
+} from "./util/types";
+import valueToKey from "./util/valueToKey";
+import {
+ RecordGetRequest,
+ ResultLevel,
+ Backend,
+ DatabaseTransaction,
+ RecordStoreRequest,
+} from "./backend-interface";
+
+/**
+ * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#cursor
+ */
+class BridgeIDBCursor {
+ _request: BridgeIDBRequest | undefined;
+
+ private _gotValue: boolean = false;
+ private _range: CursorRange;
+ private _position = undefined; // Key of previously returned record
+ private _objectStorePosition = undefined;
+ private _keyOnly: boolean = false;
+
+ private _source: CursorSource;
+ private _direction: BridgeIDBCursorDirection;
+ private _key = undefined;
+ private _primaryKey: Key | undefined = undefined;
+ private _indexName: string | undefined;
+ private _objectStoreName: string;
+
+ constructor(
+ source: CursorSource,
+ objectStoreName: string,
+ indexName: string | undefined,
+ range: CursorRange,
+ direction: BridgeIDBCursorDirection,
+ request: BridgeIDBRequest,
+ keyOnly: boolean,
+ ) {
+ this._indexName = indexName;
+ this._objectStoreName = objectStoreName;
+ this._range = range;
+ this._source = source;
+ this._direction = direction;
+ this._request = request;
+ this._keyOnly = keyOnly;
+ }
+
+ get _effectiveObjectStore(): BridgeIDBObjectStore {
+ if (this.source instanceof BridgeIDBObjectStore) {
+ return this.source;
+ }
+ return this.source.objectStore;
+ }
+
+ get _backend(): Backend {
+ return this._source._backend;
+ }
+
+ // Read only properties
+ get source() {
+ return this._source;
+ }
+ set source(val) {
+ /* For babel */
+ }
+
+ get direction() {
+ return this._direction;
+ }
+ set direction(val) {
+ /* For babel */
+ }
+
+ get key() {
+ return this._key;
+ }
+ set key(val) {
+ /* For babel */
+ }
+
+ get primaryKey() {
+ return this._primaryKey;
+ }
+ set primaryKey(val) {
+ /* For babel */
+ }
+
+ /**
+ * https://w3c.github.io/IndexedDB/#iterate-a-cursor
+ */
+ async _iterate(key?: Key, primaryKey?: Key): Promise<any> {
+ const recordGetRequest: RecordGetRequest = {
+ direction: this.direction,
+ indexName: this._indexName,
+ lastIndexPosition: this._position,
+ lastObjectStorePosition: this._objectStorePosition,
+ limit: 1,
+ range: this._range,
+ objectStoreName: this._objectStoreName,
+ advanceIndexKey: key,
+ advancePrimaryKey: primaryKey,
+ resultLevel: this._keyOnly ? ResultLevel.OnlyKeys : ResultLevel.Full,
+ };
+
+ const { btx } = this.source._confirmActiveTransaction();
+
+ let response = await this._backend.getRecords(
+ btx,
+ recordGetRequest,
+ );
+
+ if (response.count === 0) {
+ return null;
+ }
+
+ return this;
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-update-IDBRequest-any-value
+ public update(value: Value) {
+ if (value === undefined) {
+ throw new TypeError();
+ }
+
+ const transaction = this._effectiveObjectStore.transaction;
+
+ if (transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ if (transaction.mode === "readonly") {
+ throw new ReadOnlyError();
+ }
+
+ if (this._effectiveObjectStore._deleted) {
+ throw new InvalidStateError();
+ }
+ if (
+ !(this.source instanceof BridgeIDBObjectStore) &&
+ this.source._deleted
+ ) {
+ throw new InvalidStateError();
+ }
+
+ if (!this._gotValue || !this.hasOwnProperty("value")) {
+ throw new InvalidStateError();
+ }
+
+ const storeReq: RecordStoreRequest = {
+ overwrite: true,
+ key: this._primaryKey,
+ value: value,
+ objectStoreName: this._objectStoreName,
+ };
+
+ const operation = async () => {
+ const { btx } = this.source._confirmActiveTransaction();
+ this._backend.storeRecord(btx, storeReq);
+ };
+ return transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ /**
+ *
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-advance-void-unsigned-long-count
+ */
+ public advance(count: number) {
+ throw Error("not implemented");
+ }
+
+ /**
+ *
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBCursor-continue-void-any-key
+ */
+ public continue(key?: Key) {
+ const transaction = this._effectiveObjectStore.transaction;
+
+ if (transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ if (this._effectiveObjectStore._deleted) {
+ throw new InvalidStateError();
+ }
+ if (
+ !(this.source instanceof BridgeIDBObjectStore) &&
+ this.source._deleted
+ ) {
+ throw new InvalidStateError();
+ }
+
+ if (!this._gotValue) {
+ throw new InvalidStateError();
+ }
+
+ if (key !== undefined) {
+ key = valueToKey(key);
+
+ const cmpResult = cmp(key, this._position);
+
+ if (
+ (cmpResult <= 0 &&
+ (this.direction === "next" || this.direction === "nextunique")) ||
+ (cmpResult >= 0 &&
+ (this.direction === "prev" || this.direction === "prevunique"))
+ ) {
+ throw new DataError();
+ }
+ }
+
+ if (this._request) {
+ this._request.readyState = "pending";
+ }
+
+ const operation = async () => {
+ this._iterate(key);
+ };
+
+ transaction._execRequestAsync({
+ operation,
+ request: this._request,
+ source: this.source,
+ });
+
+ this._gotValue = false;
+ }
+
+ // https://w3c.github.io/IndexedDB/#dom-idbcursor-continueprimarykey
+ public continuePrimaryKey(key: Key, primaryKey: Key) {
+ throw Error("not implemented");
+ }
+
+ public delete() {
+ const transaction = this._effectiveObjectStore.transaction;
+
+ if (transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ if (transaction.mode === "readonly") {
+ throw new ReadOnlyError();
+ }
+
+ if (this._effectiveObjectStore._deleted) {
+ throw new InvalidStateError();
+ }
+ if (
+ !(this.source instanceof BridgeIDBObjectStore) &&
+ this.source._deleted
+ ) {
+ throw new InvalidStateError();
+ }
+
+ if (!this._gotValue || !this.hasOwnProperty("value")) {
+ throw new InvalidStateError();
+ }
+
+ const operation = async () => {
+ const { btx } = this.source._confirmActiveTransaction();
+ this._backend.deleteRecord(
+ btx,
+ this._objectStoreName,
+ BridgeIDBKeyRange._valueToKeyRange(this._primaryKey),
+ );
+ };
+
+ return transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ public toString() {
+ return "[object IDBCursor]";
+ }
+}
+
+export default BridgeIDBCursor;
diff --git a/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts
b/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts
new file mode 100644
index 00000000..2739a6f1
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBCursorWithValue.ts
@@ -0,0 +1,44 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import {
+ CursorRange,
+ CursorSource,
+ BridgeIDBCursorDirection,
+ Value,
+} from "./util/types";
+
+class FDBCursorWithValue extends BridgeIDBCursor {
+ public value: Value = undefined;
+
+ constructor(
+ source: CursorSource,
+ objectStoreName: string,
+ indexName: string | undefined,
+ range: CursorRange,
+ direction: BridgeIDBCursorDirection,
+ request?: any,
+ ) {
+ super(source, objectStoreName, indexName, range, direction, request,
true);
+ }
+
+ public toString() {
+ return "[object IDBCursorWithValue]";
+ }
+}
+
+export default FDBCursorWithValue;
diff --git a/packages/idb-bridge/src/BridgeIDBDatabase.ts
b/packages/idb-bridge/src/BridgeIDBDatabase.ts
new file mode 100644
index 00000000..cff2fd6e
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBDatabase.ts
@@ -0,0 +1,239 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import {
+ ConstraintError,
+ InvalidAccessError,
+ InvalidStateError,
+ NotFoundError,
+ TransactionInactiveError,
+} from "./util/errors";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import FakeEventTarget from "./util/FakeEventTarget";
+import { FakeDOMStringList, KeyPath, TransactionMode } from "./util/types";
+import validateKeyPath from "./util/validateKeyPath";
+import queueTask from "./util/queueTask";
+import {
+ Backend,
+ DatabaseConnection,
+ Schema,
+ DatabaseTransaction,
+} from "./backend-interface";
+
+/**
+ * Ensure that an active version change transaction is currently running.
+ */
+const confirmActiveVersionchangeTransaction = (database: BridgeIDBDatabase) =>
{
+ if (!database._runningVersionchangeTransaction) {
+ throw new InvalidStateError();
+ }
+
+ // Find the latest versionchange transaction
+ const transactions = database._transactions.filter(
+ (tx: BridgeIDBTransaction) => {
+ return tx.mode === "versionchange";
+ },
+ );
+ const transaction = transactions[transactions.length - 1];
+
+ if (!transaction || transaction._state === "finished") {
+ throw new InvalidStateError();
+ }
+
+ if (transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ return transaction;
+};
+
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#database-interface
+class BridgeIDBDatabase extends FakeEventTarget {
+ _closePending = false;
+ _closed = false;
+ _runningVersionchangeTransaction = false;
+ _transactions: Array<BridgeIDBTransaction> = [];
+
+ _backendConnection: DatabaseConnection;
+ _backend: Backend;
+
+ _schema: Schema;
+
+ get name(): string {
+ return this._schema.databaseName;
+ }
+
+ get version(): number {
+ return this._schema.databaseVersion;
+ }
+
+ get objectStoreNames(): FakeDOMStringList {
+ return fakeDOMStringList(Object.keys(this._schema.objectStores)).sort();
+ }
+
+ /**
+ * http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#database-closing-steps
+ */
+ _closeConnection() {
+ this._closePending = true;
+
+ const transactionsComplete = this._transactions.every(
+ (transaction: BridgeIDBTransaction) => {
+ return transaction._state === "finished";
+ },
+ );
+
+ if (transactionsComplete) {
+ this._closed = true;
+ this._backend.close(this._backendConnection);
+ } else {
+ queueTask(() => {
+ this._closeConnection();
+ });
+ }
+ }
+
+ constructor(backend: Backend, backendConnection: DatabaseConnection) {
+ super();
+
+ this._schema = backend.getSchema(backendConnection);
+
+ this._backend = backend;
+ this._backendConnection = backendConnection;
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbdatabase-createobjectstore
+ public createObjectStore(
+ name: string,
+ options: { autoIncrement?: boolean; keyPath?: KeyPath } | null = {},
+ ) {
+ if (name === undefined) {
+ throw new TypeError();
+ }
+ const transaction = confirmActiveVersionchangeTransaction(this);
+ const backendTx = transaction._backendTransaction;
+ if (!backendTx) {
+ throw Error("invariant violated");
+ }
+
+ const keyPath =
+ options !== null && options.keyPath !== undefined
+ ? options.keyPath
+ : null;
+ const autoIncrement =
+ options !== null && options.autoIncrement !== undefined
+ ? options.autoIncrement
+ : false;
+
+ if (keyPath !== null) {
+ validateKeyPath(keyPath);
+ }
+
+ if (!Object.keys(this._schema.objectStores).includes(name)) {
+ throw new ConstraintError();
+ }
+
+ if (autoIncrement && (keyPath === "" || Array.isArray(keyPath))) {
+ throw new InvalidAccessError();
+ }
+
+ transaction._backend.createObjectStore(backendTx, name, keyPath,
autoIncrement);
+
+ this._schema = this._backend.getSchema(this._backendConnection);
+
+ return transaction.objectStore("name");
+ }
+
+ public deleteObjectStore(name: string): void {
+ if (name === undefined) {
+ throw new TypeError();
+ }
+ const transaction = confirmActiveVersionchangeTransaction(this);
+ transaction._objectStoresCache.delete(name);
+ }
+
+ public _internalTransaction(
+ storeNames: string | string[],
+ mode?: TransactionMode,
+ backendTransaction?: DatabaseTransaction,
+ ): BridgeIDBTransaction {
+ mode = mode !== undefined ? mode : "readonly";
+ if (
+ mode !== "readonly" &&
+ mode !== "readwrite" &&
+ mode !== "versionchange"
+ ) {
+ throw new TypeError("Invalid mode: " + mode);
+ }
+
+ const hasActiveVersionchange = this._transactions.some(
+ (transaction: BridgeIDBTransaction) => {
+ return (
+ transaction._state === "active" &&
+ transaction.mode === "versionchange" &&
+ transaction.db === this
+ );
+ },
+ );
+ if (hasActiveVersionchange) {
+ throw new InvalidStateError();
+ }
+
+ if (this._closePending) {
+ throw new InvalidStateError();
+ }
+
+ if (!Array.isArray(storeNames)) {
+ storeNames = [storeNames];
+ }
+ if (storeNames.length === 0 && mode !== "versionchange") {
+ throw new InvalidAccessError();
+ }
+ for (const storeName of storeNames) {
+ if (this.objectStoreNames.indexOf(storeName) < 0) {
+ throw new NotFoundError(
+ "No objectStore named " + storeName + " in this database",
+ );
+ }
+ }
+
+ const tx = new BridgeIDBTransaction(storeNames, mode, this,
backendTransaction);
+ this._transactions.push(tx);
+ return tx;
+ }
+
+ public transaction(
+ storeNames: string | string[],
+ mode?: TransactionMode,
+ ): BridgeIDBTransaction {
+ if (mode === "versionchange") {
+ throw new TypeError("Invalid mode: " + mode);
+ }
+ return this._internalTransaction(storeNames, mode);
+ }
+
+ public close() {
+ this._closeConnection();
+ }
+
+ public toString() {
+ return "[object IDBDatabase]";
+ }
+}
+
+export default BridgeIDBDatabase;
diff --git a/packages/idb-bridge/src/BridgeIDBFactory.ts
b/packages/idb-bridge/src/BridgeIDBFactory.ts
new file mode 100644
index 00000000..c2747238
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBFactory.ts
@@ -0,0 +1,192 @@
+/*
+ * Copyright 2019 Florian Dold
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeIDBDatabase from "./BridgeIDBDatabase";
+import BridgeIDBOpenDBRequest from "./BridgeIDBOpenDBRequest";
+import BridgeIDBVersionChangeEvent from "./BridgeIDBVersionChangeEvent";
+import compareKeys from "./util/cmp";
+import enforceRange from "./util/enforceRange";
+import { AbortError, VersionError } from "./util/errors";
+import FakeEvent from "./util/FakeEvent";
+import { Backend, DatabaseConnection } from "./backend-interface";
+import queueTask from "./util/queueTask";
+
+type DatabaseList = Array<{ name: string; version: number }>;
+
+class BridgeIDBFactory {
+ public cmp = compareKeys;
+ private backend: Backend;
+ private connections: BridgeIDBDatabase[] = [];
+
+ public constructor(backend: Backend) {
+ this.backend = backend;
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBFactory-deleteDatabase-IDBOpenDBRequest-DOMString-name
+ public deleteDatabase(name: string): BridgeIDBOpenDBRequest {
+ const request = new BridgeIDBOpenDBRequest();
+ request.source = null;
+
+ queueTask(async () => {
+ const databases = await this.backend.getDatabases();
+ const dbInfo = databases.find((x) => x.name == name);
+ if (!dbInfo) {
+ // Database already doesn't exist, success!
+ const event = new BridgeIDBVersionChangeEvent("success", {
+ newVersion: null,
+ oldVersion: 0,
+ });
+ request.dispatchEvent(event);
+ return;
+ }
+ const oldVersion = dbInfo.version;
+
+ try {
+ const dbconn = await this.backend.connectDatabase(name);
+ const backendTransaction = await
this.backend.enterVersionChange(dbconn, 0);
+ await this.backend.deleteDatabase(backendTransaction, name);
+ await this.backend.commit(backendTransaction);
+ await this.backend.close(dbconn);
+
+ request.result = undefined;
+ request.readyState = "done";
+
+ const event2 = new BridgeIDBVersionChangeEvent("success", {
+ newVersion: null,
+ oldVersion,
+ });
+ request.dispatchEvent(event2);
+ } catch (err) {
+ request.error = new Error();
+ request.error.name = err.name;
+ request.readyState = "done";
+
+ const event = new FakeEvent("error", {
+ bubbles: true,
+ cancelable: true,
+ });
+ event.eventPath = [];
+ request.dispatchEvent(event);
+ }
+ });
+
+ return request;
+ }
+
+ // tslint:disable-next-line max-line-length
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBFactory-open-IDBOpenDBRequest-DOMString-name-unsigned-long-long-version
+ public open(name: string, version?: number) {
+ if (arguments.length > 1 && version !== undefined) {
+ // Based on spec, not sure why "MAX_SAFE_INTEGER" instead of "unsigned
long long", but it's needed to pass
+ // tests
+ version = enforceRange(version, "MAX_SAFE_INTEGER");
+ }
+ if (version === 0) {
+ throw new TypeError();
+ }
+
+ const request = new BridgeIDBOpenDBRequest();
+
+ queueTask(async () => {
+ let dbconn: DatabaseConnection;
+ try {
+ dbconn = await this.backend.connectDatabase(name);
+ } catch (err) {
+ request._finishWithError(err);
+ return;
+ }
+
+ const schema = this.backend.getSchema(dbconn);
+ const existingVersion = schema.databaseVersion;
+
+ if (version === undefined) {
+ version = existingVersion !== 0 ? existingVersion : 1;
+ }
+
+ const requestedVersion = version;
+
+ if (existingVersion > requestedVersion) {
+ request._finishWithError(new VersionError());
+ return;
+ }
+
+ const db = new BridgeIDBDatabase(this.backend, dbconn);
+
+ if (existingVersion < requestedVersion) {
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-running-a-versionchange-transaction
+
+ for (const otherConn of this.connections) {
+ const event = new BridgeIDBVersionChangeEvent("versionchange", {
+ newVersion: version,
+ oldVersion: existingVersion,
+ });
+ otherConn.dispatchEvent(event);
+ }
+
+ if (this._anyOpen()) {
+ const event = new BridgeIDBVersionChangeEvent("blocked", {
+ newVersion: version,
+ oldVersion: existingVersion,
+ });
+ request.dispatchEvent(event);
+ }
+
+ const backendTransaction = await
this.backend.enterVersionChange(dbconn, requestedVersion);
+ db._runningVersionchangeTransaction = true;
+
+ const transaction = db._internalTransaction(
+ [],
+ "versionchange",
+ backendTransaction,
+ );
+ const event = new BridgeIDBVersionChangeEvent("upgradeneeded", {
+ newVersion: version,
+ oldVersion: existingVersion,
+ });
+
+ request.result = db;
+ request.readyState = "done";
+ request.transaction = transaction;
+ request.dispatchEvent(event);
+
+ await transaction._waitDone();
+
+ db._runningVersionchangeTransaction = false;
+ }
+
+ this.connections.push(db);
+ return db;
+ });
+
+ return request;
+ }
+
+ // https://w3c.github.io/IndexedDB/#dom-idbfactory-databases
+ public databases(): Promise<DatabaseList> {
+ return this.backend.getDatabases();
+ }
+
+ public toString(): string {
+ return "[object IDBFactory]";
+ }
+
+ private _anyOpen(): boolean {
+ return this.connections.some(c => !c._closed && !c._closePending);
+ }
+}
+
+export default BridgeIDBFactory;
diff --git a/packages/idb-bridge/src/BridgeIDBIndex.ts
b/packages/idb-bridge/src/BridgeIDBIndex.ts
new file mode 100644
index 00000000..6001bc05
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBIndex.ts
@@ -0,0 +1,316 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import BridgeIDBCursorWithValue from "./BridgeIDBCursorWithValue";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import enforceRange from "./util/enforceRange";
+import {
+ ConstraintError,
+ InvalidStateError,
+ TransactionInactiveError,
+} from "./util/errors";
+import { BridgeIDBCursorDirection, Key, KeyPath } from "./util/types";
+import valueToKey from "./util/valueToKey";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import {
+ Schema,
+ Backend,
+ DatabaseTransaction,
+ RecordGetRequest,
+ ResultLevel,
+} from "./backend-interface";
+
+const confirmActiveTransaction = (
+ index: BridgeIDBIndex,
+): BridgeIDBTransaction => {
+ if (index._deleted || index.objectStore._deleted) {
+ throw new InvalidStateError();
+ }
+
+ if (index.objectStore.transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ return index.objectStore.transaction;
+};
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#idl-def-IDBIndex
+class BridgeIDBIndex {
+ objectStore: BridgeIDBObjectStore;
+
+ get _schema(): Schema {
+ return this.objectStore.transaction.db._schema;
+ }
+
+ get keyPath(): KeyPath {
+ return this._schema.indexes[this._name].keyPath;
+ }
+
+ get multiEntry(): boolean {
+ return this._schema.indexes[this._name].multiEntry;
+ }
+
+ get unique(): boolean {
+ return this._schema.indexes[this._name].unique;
+ }
+
+ get _backend(): Backend {
+ return this.objectStore._backend;
+ }
+
+ _confirmActiveTransaction(): { btx: DatabaseTransaction } {
+ return this.objectStore._confirmActiveTransaction();
+ }
+
+ private _name: string;
+
+ public _deleted: boolean = false;
+
+ constructor(objectStore: BridgeIDBObjectStore, name: string) {
+ this._name = name;
+ this.objectStore = objectStore;
+ }
+
+ get name() {
+ return this._name;
+ }
+
+ // https://w3c.github.io/IndexedDB/#dom-idbindex-name
+ set name(name: any) {
+ const transaction = this.objectStore.transaction;
+
+ if (!transaction.db._runningVersionchangeTransaction) {
+ throw new InvalidStateError();
+ }
+
+ if (transaction._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ const { btx } = this._confirmActiveTransaction();
+
+ const oldName = this._name;
+ const newName = String(name);
+
+ if (newName === oldName) {
+ return;
+ }
+
+ this._backend.renameIndex(btx, oldName, newName);
+
+ if (this.objectStore.indexNames.indexOf(name) >= 0) {
+ throw new ConstraintError();
+ }
+ }
+
+ // tslint:disable-next-line max-line-length
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-openCursor-IDBRequest-any-range-IDBCursorDirection-direction
+ public openCursor(
+ range?: BridgeIDBKeyRange | Key | null | undefined,
+ direction: BridgeIDBCursorDirection = "next",
+ ) {
+ confirmActiveTransaction(this);
+
+ if (range === null) {
+ range = undefined;
+ }
+ if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+ range = BridgeIDBKeyRange.only(valueToKey(range));
+ }
+
+ const request = new BridgeIDBRequest();
+ request.source = this;
+ request.transaction = this.objectStore.transaction;
+
+ const cursor = new BridgeIDBCursorWithValue(
+ this,
+ this.objectStore.name,
+ this._name,
+ range,
+ direction,
+ request,
+ );
+
+ const operation = async () => {
+ return cursor._iterate();
+ };
+
+ return this.objectStore.transaction._execRequestAsync({
+ operation,
+ request,
+ source: this,
+ });
+ }
+
+ // tslint:disable-next-line max-line-length
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-openKeyCursor-IDBRequest-any-range-IDBCursorDirection-direction
+ public openKeyCursor(
+ range?: BridgeIDBKeyRange | Key | null | undefined,
+ direction: BridgeIDBCursorDirection = "next",
+ ) {
+ confirmActiveTransaction(this);
+
+ if (range === null) {
+ range = undefined;
+ }
+ if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+ range = BridgeIDBKeyRange.only(valueToKey(range));
+ }
+
+ const request = new BridgeIDBRequest();
+ request.source = this;
+ request.transaction = this.objectStore.transaction;
+
+ const cursor = new BridgeIDBCursor(
+ this,
+ this.objectStore.name,
+ this._name,
+ range,
+ direction,
+ request,
+ true,
+ );
+
+ return this.objectStore.transaction._execRequestAsync({
+ operation: cursor._iterate.bind(cursor),
+ request,
+ source: this,
+ });
+ }
+
+ public get(key: BridgeIDBKeyRange | Key) {
+ confirmActiveTransaction(this);
+
+ if (!(key instanceof BridgeIDBKeyRange)) {
+ key = BridgeIDBKeyRange._valueToKeyRange(key);
+ }
+
+ const getReq: RecordGetRequest = {
+ direction: "next",
+ indexName: this._name,
+ limit: 1,
+ range: key,
+ objectStoreName: this.objectStore._name,
+ resultLevel: ResultLevel.Full,
+ };
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ const result = await this._backend.getRecords(btx, getReq);
+ if (result.count == 0) {
+ return undefined;
+ }
+ const values = result.values;
+ if (!values) {
+ throw Error("invariant violated");
+ }
+ return values[0];
+ };
+
+ return this.objectStore.transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbindex-getall
+ public getAll(query?: BridgeIDBKeyRange | Key, count?: number) {
+ throw Error("not implemented");
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-getKey-IDBRequest-any-key
+ public getKey(key: BridgeIDBKeyRange | Key) {
+ confirmActiveTransaction(this);
+
+ if (!(key instanceof BridgeIDBKeyRange)) {
+ key = BridgeIDBKeyRange._valueToKeyRange(key);
+ }
+
+ const getReq: RecordGetRequest = {
+ direction: "next",
+ indexName: this._name,
+ limit: 1,
+ range: key,
+ objectStoreName: this.objectStore._name,
+ resultLevel: ResultLevel.OnlyKeys,
+ };
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ const result = await this._backend.getRecords(btx, getReq);
+ if (result.count == 0) {
+ return undefined;
+ }
+ const primaryKeys = result.primaryKeys;
+ if (!primaryKeys) {
+ throw Error("invariant violated");
+ }
+ return primaryKeys[0];
+ };
+
+ return this.objectStore.transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbindex-getallkeys
+ public getAllKeys(query?: BridgeIDBKeyRange | Key, count?: number) {
+ throw Error("not implemented");
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBIndex-count-IDBRequest-any-key
+ public count(key: BridgeIDBKeyRange | Key | null | undefined) {
+ confirmActiveTransaction(this);
+
+ if (key === null) {
+ key = undefined;
+ }
+ if (key !== undefined && !(key instanceof BridgeIDBKeyRange)) {
+ key = BridgeIDBKeyRange.only(valueToKey(key));
+ }
+
+ const getReq: RecordGetRequest = {
+ direction: "next",
+ indexName: this._name,
+ limit: 1,
+ range: key,
+ objectStoreName: this.objectStore._name,
+ resultLevel: ResultLevel.OnlyCount,
+ };
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ const result = await this._backend.getRecords(btx, getReq);
+ return result.count;
+ };
+
+ return this.objectStore.transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+
+ }
+
+ public toString() {
+ return "[object IDBIndex]";
+ }
+}
+
+export default BridgeIDBIndex;
diff --git a/packages/idb-bridge/src/BridgeIDBKeyRange.ts
b/packages/idb-bridge/src/BridgeIDBKeyRange.ts
new file mode 100644
index 00000000..2b32c7e0
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBKeyRange.ts
@@ -0,0 +1,133 @@
+/*
+ Copyright 2019 Florian Dold
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import compareKeys from "./util/cmp";
+import { DataError } from "./util/errors";
+import { Key } from "./util/types";
+import valueToKey from "./util/valueToKey";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#range-concept
+class BridgeIDBKeyRange {
+ public static only(value: Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ value = valueToKey(value);
+ return new BridgeIDBKeyRange(value, value, false, false);
+ }
+
+ static lowerBound(lower: Key, open: boolean = false) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ lower = valueToKey(lower);
+ return new BridgeIDBKeyRange(lower, undefined, open, true);
+ }
+
+ static upperBound(upper: Key, open: boolean = false) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ upper = valueToKey(upper);
+ return new BridgeIDBKeyRange(undefined, upper, true, open);
+ }
+
+ static bound(
+ lower: Key,
+ upper: Key,
+ lowerOpen: boolean = false,
+ upperOpen: boolean = false,
+ ) {
+ if (arguments.length < 2) {
+ throw new TypeError();
+ }
+
+ const cmpResult = compareKeys(lower, upper);
+ if (cmpResult === 1 || (cmpResult === 0 && (lowerOpen || upperOpen))) {
+ throw new DataError();
+ }
+
+ lower = valueToKey(lower);
+ upper = valueToKey(upper);
+ return new BridgeIDBKeyRange(lower, upper, lowerOpen, upperOpen);
+ }
+
+ readonly lower: Key | undefined;
+ readonly upper: Key | undefined;
+ readonly lowerOpen: boolean;
+ readonly upperOpen: boolean;
+
+ constructor(
+ lower: Key | undefined,
+ upper: Key | undefined,
+ lowerOpen: boolean,
+ upperOpen: boolean,
+ ) {
+ this.lower = lower;
+ this.upper = upper;
+ this.lowerOpen = lowerOpen;
+ this.upperOpen = upperOpen;
+ }
+
+ // https://w3c.github.io/IndexedDB/#dom-idbkeyrange-includes
+ includes(key: Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ key = valueToKey(key);
+
+ if (this.lower !== undefined) {
+ const cmpResult = compareKeys(this.lower, key);
+
+ if (cmpResult === 1 || (cmpResult === 0 && this.lowerOpen)) {
+ return false;
+ }
+ }
+ if (this.upper !== undefined) {
+ const cmpResult = compareKeys(this.upper, key);
+
+ if (cmpResult === -1 || (cmpResult === 0 && this.upperOpen)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ toString() {
+ return "[object IDBKeyRange]";
+ }
+
+ static _valueToKeyRange(value: any, nullDisallowedFlag: boolean = false) {
+ if (value instanceof BridgeIDBKeyRange) {
+ return value;
+ }
+
+ if (value === null || value === undefined) {
+ if (nullDisallowedFlag) {
+ throw new DataError();
+ }
+ return new BridgeIDBKeyRange(undefined, undefined, false, false);
+ }
+
+ const key = valueToKey(value);
+
+ return BridgeIDBKeyRange.only(key);
+ }
+
+}
+
+export default BridgeIDBKeyRange;
diff --git a/packages/idb-bridge/src/BridgeIDBObjectStore.ts
b/packages/idb-bridge/src/BridgeIDBObjectStore.ts
new file mode 100644
index 00000000..197f06d8
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBObjectStore.ts
@@ -0,0 +1,441 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import BridgeIDBCursor from "./BridgeIDBCursor";
+import BridgeIDBCursorWithValue from "./BridgeIDBCursorWithValue";
+import BridgeIDBIndex from "./BridgeIDBIndex";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+
+import {
+ ConstraintError,
+ DataError,
+ InvalidAccessError,
+ InvalidStateError,
+ NotFoundError,
+ ReadOnlyError,
+ TransactionInactiveError,
+} from "./util/errors";
+import extractKey from "./util/extractKey";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import structuredClone from "./util/structuredClone";
+import {
+ FakeDOMStringList,
+ BridgeIDBCursorDirection,
+ Key,
+ KeyPath,
+ Value,
+} from "./util/types";
+import validateKeyPath from "./util/validateKeyPath";
+import valueToKey from "./util/valueToKey";
+import {
+ DatabaseTransaction,
+ RecordGetRequest,
+ ResultLevel,
+} from "./backend-interface";
+
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#object-store
+class BridgeIDBObjectStore {
+ _indexesCache: Map<string, BridgeIDBIndex> = new Map();
+
+ transaction: BridgeIDBTransaction;
+
+ get autoIncrement(): boolean {
+ return this._schema.objectStores[this._name].autoIncrement;
+ }
+
+ get indexNames(): FakeDOMStringList {
+ return
fakeDOMStringList(this._schema.objectStores[this._name].indexes).sort();
+ }
+
+ get keyPath(): KeyPath | null {
+ return this._schema.objectStores[this._name].keyPath;
+ }
+
+ _name: string;
+
+ get _schema() {
+ return this.transaction.db._schema;
+ }
+
+ _deleted: boolean = false;
+
+ constructor(transaction: BridgeIDBTransaction, name: string) {
+ this._name = name;
+ this.transaction = transaction;
+ }
+
+ get name() {
+ return this._name;
+ }
+
+ get _backend() {
+ return this.transaction.db._backend;
+ }
+
+ get _backendConnection() {
+ return this.transaction.db._backendConnection;
+ }
+
+ _confirmActiveTransaction(): { btx: DatabaseTransaction } {
+ const btx = this.transaction._backendTransaction;
+ if (!btx) {
+ throw new InvalidStateError();
+ }
+ return { btx };
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-name
+ set name(newName: any) {
+ const transaction = this.transaction;
+
+ if (!transaction.db._runningVersionchangeTransaction) {
+ throw new InvalidStateError();
+ }
+
+ let { btx } = this._confirmActiveTransaction();
+
+
+ newName = String(newName);
+
+ const oldName = this._name;
+
+ if (newName === oldName) {
+ return;
+ }
+
+ this._backend.renameObjectStore(btx, oldName, newName);
+ this.transaction.db._schema =
this._backend.getSchema(this._backendConnection);
+ }
+
+ public _store(value: Value, key: Key | undefined, overwrite: boolean) {
+ if (this.transaction.mode === "readonly") {
+ throw new ReadOnlyError();
+ }
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ return this._backend.storeRecord(btx, {
+ objectStoreName: this._name,
+ key: key,
+ value: value,
+ overwrite,
+ });
+ };
+
+ return this.transaction._execRequestAsync({ operation, source: this });
+ }
+
+ public put(value: Value, key?: Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ return this._store(value, key, true);
+ }
+
+ public add(value: Value, key?: Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+ return this._store(value, key, false);
+ }
+
+ public delete(key: Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+
+ if (this.transaction.mode === "readonly") {
+ throw new ReadOnlyError();
+ }
+
+ if (!(key instanceof BridgeIDBKeyRange)) {
+ key = valueToKey(key);
+ }
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ return this._backend.deleteRecord(btx, this._name, key);
+ }
+
+ return this.transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ public get(key?: BridgeIDBKeyRange | Key) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+
+ if (!(key instanceof BridgeIDBKeyRange)) {
+ key = valueToKey(key);
+ }
+
+ const recordRequest: RecordGetRequest = {
+ objectStoreName: this._name,
+ indexName: undefined,
+ lastIndexPosition: undefined,
+ lastObjectStorePosition: undefined,
+ direction: "next",
+ limit: 1,
+ resultLevel: ResultLevel.Full,
+ range: key,
+ };
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ const result = await this._backend.getRecords(
+ btx,
+ recordRequest,
+ );
+ if (result.count == 0) {
+ return undefined;
+ }
+ const values = result.values;
+ if (!values) {
+ throw Error("invariant violated");
+ }
+ return values[0];
+ };
+
+ return this.transaction._execRequestAsync({
+ operation,
+ source: this,
+ });
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getall
+ public getAll(query?: BridgeIDBKeyRange | Key, count?: number) {
+ throw Error("not implemented");
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getkey
+ public getKey(key?: BridgeIDBKeyRange | Key) {
+ throw Error("not implemented");
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbobjectstore-getallkeys
+ public getAllKeys(query?: BridgeIDBKeyRange | Key, count?: number) {
+ throw Error("not implemented");
+ }
+
+ public clear() {
+ throw Error("not implemented");
+ }
+
+ public openCursor(
+ range?: BridgeIDBKeyRange | Key,
+ direction: BridgeIDBCursorDirection = "next",
+ ) {
+
+ if (range === null) {
+ range = undefined;
+ }
+ if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+ range = BridgeIDBKeyRange.only(valueToKey(range));
+ }
+
+ const request = new BridgeIDBRequest();
+ request.source = this;
+ request.transaction = this.transaction;
+
+ const cursor = new BridgeIDBCursorWithValue(
+ this,
+ this._name,
+ undefined,
+ range,
+ direction,
+ request,
+ );
+
+ return this.transaction._execRequestAsync({
+ operation: () => cursor._iterate(),
+ request,
+ source: this,
+ });
+ }
+
+ public openKeyCursor(
+ range?: BridgeIDBKeyRange | Key,
+ direction?: BridgeIDBCursorDirection,
+ ) {
+ if (range === null) {
+ range = undefined;
+ }
+ if (range !== undefined && !(range instanceof BridgeIDBKeyRange)) {
+ range = BridgeIDBKeyRange.only(valueToKey(range));
+ }
+
+ if (!direction) {
+ direction = "next";
+ }
+
+ const request = new BridgeIDBRequest();
+ request.source = this;
+ request.transaction = this.transaction;
+
+ const cursor = new BridgeIDBCursor(
+ this,
+ this._name,
+ undefined,
+ range,
+ direction,
+ request,
+ true,
+ );
+
+ return this.transaction._execRequestAsync({
+ operation: cursor._iterate.bind(cursor),
+ request,
+ source: this,
+ });
+ }
+
+ // tslint:disable-next-line max-line-length
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBObjectStore-createIndex-IDBIndex-DOMString-name-DOMString-sequence-DOMString--keyPath-IDBIndexParameters-optionalParameters
+ public createIndex(
+ indexName: string,
+ keyPath: KeyPath,
+ optionalParameters: { multiEntry?: boolean; unique?: boolean } = {},
+ ) {
+ if (arguments.length < 2) {
+ throw new TypeError();
+ }
+
+ if (!this.transaction.db._runningVersionchangeTransaction) {
+ throw new InvalidStateError();
+ }
+
+ const { btx } = this._confirmActiveTransaction();
+
+ const multiEntry =
+ optionalParameters.multiEntry !== undefined
+ ? optionalParameters.multiEntry
+ : false;
+ const unique =
+ optionalParameters.unique !== undefined
+ ? optionalParameters.unique
+ : false;
+
+ if (this.transaction.mode !== "versionchange") {
+ throw new InvalidStateError();
+ }
+
+ if (this.indexNames.indexOf(indexName) >= 0) {
+ throw new ConstraintError();
+ }
+
+ validateKeyPath(keyPath);
+
+ if (Array.isArray(keyPath) && multiEntry) {
+ throw new InvalidAccessError();
+ }
+
+ this._backend.createIndex(
+ btx,
+ indexName,
+ this._name,
+ keyPath,
+ multiEntry,
+ unique,
+ );
+
+ return new BridgeIDBIndex(this, indexName);
+ }
+
+ // https://w3c.github.io/IndexedDB/#dom-idbobjectstore-index
+ public index(name: string) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+
+ if (this.transaction._state === "finished") {
+ throw new InvalidStateError();
+ }
+
+ const index = this._indexesCache.get(name);
+ if (index !== undefined) {
+ return index;
+ }
+
+ return new BridgeIDBIndex(this, name);
+ }
+
+ public deleteIndex(name: string) {
+ if (arguments.length === 0) {
+ throw new TypeError();
+ }
+
+ if (this.transaction.mode !== "versionchange") {
+ throw new InvalidStateError();
+ }
+
+ if (!this.transaction.db._runningVersionchangeTransaction) {
+ throw new InvalidStateError();
+ }
+
+ const { btx } = this._confirmActiveTransaction();
+
+ const index = this._indexesCache.get(name);
+ if (index !== undefined) {
+ index._deleted = true;
+ }
+
+ this._backend.deleteIndex(btx, name);
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#widl-IDBObjectStore-count-IDBRequest-any-key
+ public count(key?: Key | BridgeIDBKeyRange) {
+
+ if (key === null) {
+ key = undefined;
+ }
+ if (key !== undefined && !(key instanceof BridgeIDBKeyRange)) {
+ key = BridgeIDBKeyRange.only(valueToKey(key));
+ }
+
+ const recordGetRequest: RecordGetRequest = {
+ direction: "next",
+ indexName: undefined,
+ lastIndexPosition: undefined,
+ limit: -1,
+ objectStoreName: this._name,
+ lastObjectStorePosition: undefined,
+ range: key,
+ resultLevel: ResultLevel.OnlyCount,
+ };
+
+ const operation = async () => {
+ const { btx } = this._confirmActiveTransaction();
+ const result = await this._backend.getRecords(
+ btx,
+ recordGetRequest,
+ );
+ return result.count;
+ };
+
+ return this.transaction._execRequestAsync({ operation, source: this });
+ }
+
+ public toString() {
+ return "[object IDBObjectStore]";
+ }
+}
+
+export default BridgeIDBObjectStore;
diff --git a/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts
b/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts
new file mode 100644
index 00000000..7b636193
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBOpenDBRequest.ts
@@ -0,0 +1,36 @@
+/*
+ Copyright 2019 Florian Dold
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import { EventCallback } from "./util/types";
+
+class BridgeIDBOpenDBRequest extends BridgeIDBRequest {
+ public onupgradeneeded: EventCallback | null = null;
+ public onblocked: EventCallback | null = null;
+
+ constructor() {
+ super();
+ // https://www.w3.org/TR/IndexedDB/#open-requests
+ this.source = null;
+ }
+
+ public toString() {
+ return "[object IDBOpenDBRequest]";
+ }
+}
+
+export default BridgeIDBOpenDBRequest;
diff --git a/packages/idb-bridge/src/BridgeIDBRequest.ts
b/packages/idb-bridge/src/BridgeIDBRequest.ts
new file mode 100644
index 00000000..cd009285
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBRequest.ts
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import BridgeFDBCursor from "./BridgeIDBCursor";
+import BridgeIDBIndex from "./BridgeIDBIndex";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBTransaction from "./BridgeIDBTransaction";
+import { InvalidStateError } from "./util/errors";
+import FakeEventTarget from "./util/FakeEventTarget";
+import { EventCallback } from "./util/types";
+import FakeEvent from "./util/FakeEvent";
+
+class BridgeIDBRequest extends FakeEventTarget {
+ _result: any = null;
+ _error: Error | null | undefined = null;
+ source: BridgeFDBCursor | BridgeIDBIndex | BridgeIDBObjectStore | null =
null;
+ transaction: BridgeIDBTransaction | null = null;
+ readyState: "done" | "pending" = "pending";
+ onsuccess: EventCallback | null = null;
+ onerror: EventCallback | null = null;
+
+ get error() {
+ if (this.readyState === "pending") {
+ throw new InvalidStateError();
+ }
+ return this._error;
+ }
+
+ set error(value: any) {
+ this._error = value;
+ }
+
+ get result() {
+ if (this.readyState === "pending") {
+ throw new InvalidStateError();
+ }
+ return this._result;
+ }
+
+ set result(value: any) {
+ this._result = value;
+ }
+
+ toString() {
+ return "[object IDBRequest]";
+ }
+
+ _finishWithError(err: Error) {
+ this.result = undefined;
+ this.readyState = "done";
+
+ this.error = new Error(err.message);
+ this.error.name = err.name;
+
+ const event = new FakeEvent("error", {
+ bubbles: true,
+ cancelable: true,
+ });
+ event.eventPath = [];
+ this.dispatchEvent(event);
+ }
+
+ _finishWithResult(result: any) {
+ this.result = result;
+ this.readyState = "done";
+
+ const event = new FakeEvent("success");
+ event.eventPath = [];
+ this.dispatchEvent(event);
+ }
+}
+
+export default BridgeIDBRequest;
diff --git a/packages/idb-bridge/src/BridgeIDBTransaction.ts
b/packages/idb-bridge/src/BridgeIDBTransaction.ts
new file mode 100644
index 00000000..a7057e29
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBTransaction.ts
@@ -0,0 +1,301 @@
+import BridgeIDBDatabase from "./BridgeIDBDatabase";
+import BridgeIDBObjectStore from "./BridgeIDBObjectStore";
+import BridgeIDBRequest from "./BridgeIDBRequest";
+import {
+ AbortError,
+ InvalidStateError,
+ NotFoundError,
+ TransactionInactiveError,
+} from "./util/errors";
+import fakeDOMStringList from "./util/fakeDOMStringList";
+import FakeEvent from "./util/FakeEvent";
+import FakeEventTarget from "./util/FakeEventTarget";
+import {
+ EventCallback,
+ FakeDOMStringList,
+ RequestObj,
+ TransactionMode,
+} from "./util/types";
+import queueTask from "./util/queueTask";
+import openPromise from "./util/openPromise";
+import { DatabaseTransaction, Backend } from "./backend-interface";
+import { array } from "prop-types";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#transaction
+class BridgeIDBTransaction extends FakeEventTarget {
+ public _state: "active" | "inactive" | "committing" | "finished" = "active";
+ public _started = false;
+ public _objectStoresCache: Map<string, BridgeIDBObjectStore> = new Map();
+
+ public _backendTransaction?: DatabaseTransaction;
+
+ public objectStoreNames: FakeDOMStringList;
+ public mode: TransactionMode;
+ public db: BridgeIDBDatabase;
+ public error: Error | null = null;
+ public onabort: EventCallback | null = null;
+ public oncomplete: EventCallback | null = null;
+ public onerror: EventCallback | null = null;
+
+ private _waitPromise: Promise<void>;
+ private _resolveWait: () => void;
+
+ public _scope: Set<string>;
+ private _requests: Array<{
+ operation: () => void;
+ request: BridgeIDBRequest;
+ }> = [];
+
+ get _backend(): Backend {
+ return this.db._backend;
+ }
+
+ constructor(
+ storeNames: string[],
+ mode: TransactionMode,
+ db: BridgeIDBDatabase,
+ backendTransaction?: DatabaseTransaction,
+ ) {
+ super();
+
+ const myOpenPromise = openPromise<void>();
+ this._waitPromise = myOpenPromise.promise;
+ this._resolveWait = myOpenPromise.resolve;
+
+ this._scope = new Set(storeNames);
+ this._backendTransaction = backendTransaction;
+ this.mode = mode;
+ this.db = db;
+ this.objectStoreNames = fakeDOMStringList(Array.from(this._scope).sort());
+
+ this.db._transactions.push(this);
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-aborting-a-transaction
+ async _abort(errName: string | null) {
+ this._state = "finished";
+
+ if (errName !== null) {
+ const e = new Error();
+ e.name = errName;
+ this.error = e;
+ }
+
+ // Should this directly remove from _requests?
+ for (const { request } of this._requests) {
+ if (request.readyState !== "done") {
+ request.readyState = "done"; // This will cancel execution of this
request's operation
+ if (request.source) {
+ request.result = undefined;
+ request.error = new AbortError();
+
+ const event = new FakeEvent("error", {
+ bubbles: true,
+ cancelable: true,
+ });
+ event.eventPath = [this.db, this];
+ request.dispatchEvent(event);
+ }
+ }
+ }
+
+ // Only roll back if we actually executed the scheduled operations.
+ const maybeBtx = this._backendTransaction;
+ if (maybeBtx) {
+ await this._backend.rollback(maybeBtx);
+ }
+
+ queueTask(() => {
+ const event = new FakeEvent("abort", {
+ bubbles: true,
+ cancelable: false,
+ });
+ event.eventPath = [this.db];
+ this.dispatchEvent(event);
+ });
+
+ }
+
+ public abort() {
+ if (this._state === "committing" || this._state === "finished") {
+ throw new InvalidStateError();
+ }
+ this._state = "active";
+
+ this._abort(null);
+ }
+
+ // http://w3c.github.io/IndexedDB/#dom-idbtransaction-objectstore
+ public objectStore(name: string) {
+ if (this._state !== "active") {
+ throw new InvalidStateError();
+ }
+
+ const objectStore = this._objectStoresCache.get(name);
+ if (objectStore !== undefined) {
+ return objectStore;
+ }
+
+ return new BridgeIDBObjectStore(this, name);
+ }
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-asynchronously-executing-a-request
+ public _execRequestAsync(obj: RequestObj) {
+ const source = obj.source;
+ const operation = obj.operation;
+ let request = obj.hasOwnProperty("request") ? obj.request : null;
+
+ if (this._state !== "active") {
+ throw new TransactionInactiveError();
+ }
+
+ // Request should only be passed for cursors
+ if (!request) {
+ if (!source) {
+ // Special requests like indexes that just need to run some code
+ request = new BridgeIDBRequest();
+ } else {
+ request = new BridgeIDBRequest();
+ request.source = source;
+ request.transaction = (source as any).transaction;
+ }
+ }
+
+ this._requests.push({
+ operation,
+ request,
+ });
+
+ return request;
+ }
+
+ public async _start() {
+ this._started = true;
+
+ if (!this._backendTransaction) {
+ this._backendTransaction = await this._backend.beginTransaction(
+ this.db._backendConnection,
+ Array.from(this._scope),
+ this.mode,
+ );
+ }
+
+ // Remove from request queue - cursor ones will be added back if necessary
by cursor.continue and such
+ let operation;
+ let request;
+ while (this._requests.length > 0) {
+ const r = this._requests.shift();
+
+ // This should only be false if transaction was aborted
+ if (r && r.request.readyState !== "done") {
+ request = r.request;
+ operation = r.operation;
+ break;
+ }
+ }
+
+ if (request && operation) {
+ if (!request.source) {
+ // Special requests like indexes that just need to run some code, with
error handling already built into
+ // operation
+ await operation();
+ } else {
+ let defaultAction;
+ let event;
+ try {
+ const result = await operation();
+ request.readyState = "done";
+ request.result = result;
+ request.error = undefined;
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-a-success-event
+ if (this._state === "inactive") {
+ this._state = "active";
+ }
+ event = new FakeEvent("success", {
+ bubbles: false,
+ cancelable: false,
+ });
+ } catch (err) {
+ request.readyState = "done";
+ request.result = undefined;
+ request.error = err;
+
+ //
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-an-error-event
+ if (this._state === "inactive") {
+ this._state = "active";
+ }
+ event = new FakeEvent("error", {
+ bubbles: true,
+ cancelable: true,
+ });
+
+ defaultAction = this._abort.bind(this, err.name);
+ }
+
+ try {
+ event.eventPath = [this.db, this];
+ request.dispatchEvent(event);
+ } catch (err) {
+ if (this._state !== "committing") {
+ this._abort("AbortError");
+ }
+ throw err;
+ }
+
+ // Default action of event
+ if (!event.canceled) {
+ if (defaultAction) {
+ defaultAction();
+ }
+ }
+ }
+
+ // On to the next one
+ if (this._requests.length > 0) {
+ this._start();
+ } else {
+ // Give it another chance for new handlers to be set before finishing
+ queueTask(() => this._start());
+ }
+ return;
+ }
+
+ // Check if transaction complete event needs to be fired
+ if (this._state !== "finished") {
+ // Either aborted or committed already
+ this._state = "finished";
+
+ if (!this.error) {
+ const event = new FakeEvent("complete");
+ this.dispatchEvent(event);
+ }
+
+ const idx = this.db._transactions.indexOf(this);
+ if (idx < 0) {
+ throw Error("invariant failed");
+ }
+ this.db._transactions.splice(idx, 1);
+
+ this._resolveWait();
+ }
+ }
+
+ public commit() {
+ if (this._state !== "active") {
+ throw new InvalidStateError();
+ }
+
+ this._state = "committing";
+ }
+
+ public toString() {
+ return "[object IDBRequest]";
+ }
+
+ _waitDone(): Promise<void> {
+ return this._waitPromise;
+ }
+}
+
+export default BridgeIDBTransaction;
diff --git a/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts
b/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts
new file mode 100644
index 00000000..6fc63ee3
--- /dev/null
+++ b/packages/idb-bridge/src/BridgeIDBVersionChangeEvent.ts
@@ -0,0 +1,41 @@
+/*
+ Copyright 2019 Florian Dold
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import FakeEvent from "./util/FakeEvent";
+
+class BridgeIDBVersionChangeEvent extends FakeEvent {
+ public newVersion: number | null;
+ public oldVersion: number;
+
+ constructor(
+ type: "blocked" | "success" | "upgradeneeded" | "versionchange",
+ parameters: { newVersion?: number | null; oldVersion?: number } = {},
+ ) {
+ super(type);
+
+ this.newVersion =
+ parameters.newVersion !== undefined ? parameters.newVersion : null;
+ this.oldVersion =
+ parameters.oldVersion !== undefined ? parameters.oldVersion : 0;
+ }
+
+ public toString() {
+ return "[object IDBVersionChangeEvent]";
+ }
+}
+
+export default BridgeIDBVersionChangeEvent;
diff --git a/packages/idb-bridge/src/MemoryBackend.test.ts
b/packages/idb-bridge/src/MemoryBackend.test.ts
new file mode 100644
index 00000000..3d2d0fbc
--- /dev/null
+++ b/packages/idb-bridge/src/MemoryBackend.test.ts
@@ -0,0 +1,31 @@
+import test from 'ava';
+import MemoryBackend from './MemoryBackend';
+import BridgeIDBFactory from './BridgeIDBFactory';
+
+test.cb("basics", (t) => {
+
+ const backend = new MemoryBackend();
+ const idb = new BridgeIDBFactory(backend);
+
+ const request = idb.open("library");
+ request.onupgradeneeded = () => {
+ const db = request.result;
+ const store = db.createObjectStore("books", {keyPath: "isbn"});
+ const titleIndex = store.createIndex("by_title", "title", {unique: true});
+ const authorIndex = store.createIndex("by_author", "author");
+
+ // Populate with initial data.
+ store.put({title: "Quarry Memories", author: "Fred", isbn: 123456});
+ store.put({title: "Water Buffaloes", author: "Fred", isbn: 234567});
+ store.put({title: "Bedrock Nights", author: "Barney", isbn: 345678});
+ };
+
+ request.onsuccess = () => {
+ t.end();
+ };
+
+ request.onerror = () => {
+ t.fail();
+ };
+
+});
diff --git a/packages/idb-bridge/src/MemoryBackend.ts
b/packages/idb-bridge/src/MemoryBackend.ts
new file mode 100644
index 00000000..2d4b8ab9
--- /dev/null
+++ b/packages/idb-bridge/src/MemoryBackend.ts
@@ -0,0 +1,662 @@
+import {
+ Backend,
+ DatabaseConnection,
+ DatabaseTransaction,
+ Schema,
+ RecordStoreRequest,
+ IndexProperties,
+} from "./backend-interface";
+import structuredClone from "./util/structuredClone";
+import { InvalidStateError, InvalidAccessError } from "./util/errors";
+import BTree, { ISortedMap, ISortedMapF } from "./tree/b+tree";
+import BridgeIDBFactory from "./BridgeIDBFactory";
+import compareKeys from "./util/cmp";
+import extractKey from "./util/extractKey";
+import { Key, Value, KeyPath } from "./util/types";
+
+enum TransactionLevel {
+ Disconnected = 0,
+ Connected = 1,
+ Read = 2,
+ Write = 3,
+ VersionChange = 4,
+}
+
+interface ObjectStore {
+ originalName: string;
+ modifiedName: string | undefined;
+ originalData: ISortedMapF;
+ modifiedData: ISortedMapF | undefined;
+ deleted: boolean;
+ originalKeyGenerator: number;
+ modifiedKeyGenerator: number | undefined;
+}
+
+interface Index {
+ originalName: string;
+ modifiedName: string | undefined;
+ originalData: ISortedMapF;
+ modifiedData: ISortedMapF | undefined;
+ deleted: boolean;
+}
+
+interface Database {
+ committedObjectStores: { [name: string]: ObjectStore };
+ modifiedObjectStores: { [name: string]: ObjectStore };
+ committedIndexes: { [name: string]: Index };
+ modifiedIndexes: { [name: string]: Index };
+ committedSchema: Schema;
+ /**
+ * Was the transaction deleted during the running transaction?
+ */
+ deleted: boolean;
+
+ txLevel: TransactionLevel;
+
+ connectionCookie: string | undefined;
+}
+
+interface Connection {
+ dbName: string;
+
+ modifiedSchema: Schema | undefined;
+
+ /**
+ * Has the underlying database been deleted?
+ */
+ deleted: boolean;
+
+ /**
+ * Map from the effective name of an object store during
+ * the transaction to the real name.
+ */
+ objectStoreMap: { [currentName: string]: ObjectStore };
+ indexMap: { [currentName: string]: Index };
+}
+
+class AsyncCondition {
+ wait(): Promise<void> {
+ throw Error("not implemented");
+ }
+
+ trigger(): void {}
+}
+
+
+
+
+function insertIntoIndex(
+ index: Index,
+ value: Value,
+ indexProperties: IndexProperties,
+) {
+ if (indexProperties.multiEntry) {
+
+ } else {
+ const key = extractKey(value, indexProperties.keyPath);
+ }
+ throw Error("not implemented");
+}
+
+/**
+ * Primitive in-memory backend.
+ */
+export class MemoryBackend implements Backend {
+ databases: { [name: string]: Database } = {};
+
+ connectionIdCounter = 1;
+
+ transactionIdCounter = 1;
+
+ /**
+ * Connections by connection cookie.
+ */
+ connections: { [name: string]: Connection } = {};
+
+ /**
+ * Connections by transaction (!!) cookie. In this implementation,
+ * at most one transaction can run at the same time per connection.
+ */
+ connectionsByTransaction: { [tx: string]: Connection } = {};
+
+ /**
+ * Condition that is triggered whenever a client disconnects.
+ */
+ disconnectCond: AsyncCondition = new AsyncCondition();
+
+ /**
+ * Conditation that is triggered whenever a transaction finishes.
+ */
+ transactionDoneCond: AsyncCondition = new AsyncCondition();
+
+ async getDatabases(): Promise<{ name: string; version: number }[]> {
+ const dbList = [];
+ for (const name in this.databases) {
+ dbList.push({
+ name,
+ version: this.databases[name].committedSchema.databaseVersion,
+ });
+ }
+ return dbList;
+ }
+
+ async deleteDatabase(tx: DatabaseTransaction, name: string): Promise<void> {
+ const myConn = this.connectionsByTransaction[tx.transactionCookie];
+ if (!myConn) {
+ throw Error("no connection associated with transaction");
+ }
+ const myDb = this.databases[name];
+ if (!myDb) {
+ throw Error("db not found");
+ }
+ if (myDb.committedSchema.databaseName !== name) {
+ throw Error("name does not match");
+ }
+ if (myDb.txLevel < TransactionLevel.VersionChange) {
+ throw new InvalidStateError();
+ }
+ if (myDb.connectionCookie !== tx.transactionCookie) {
+ throw new InvalidAccessError();
+ }
+ myDb.deleted = true;
+ }
+
+ async connectDatabase(name: string): Promise<DatabaseConnection> {
+ const connectionId = this.connectionIdCounter++;
+ const connectionCookie = `connection-${connectionId}`;
+
+ let database = this.databases[name];
+ if (!database) {
+ const schema: Schema = {
+ databaseName: name,
+ indexes: {},
+ databaseVersion: 0,
+ objectStores: {},
+ };
+ database = {
+ committedSchema: schema,
+ deleted: false,
+ modifiedIndexes: {},
+ committedIndexes: {},
+ committedObjectStores: {},
+ modifiedObjectStores: {},
+ txLevel: TransactionLevel.Disconnected,
+ connectionCookie: undefined,
+ };
+ this.databases[name] = database;
+ }
+
+ while (database.txLevel !== TransactionLevel.Disconnected) {
+ await this.disconnectCond.wait();
+ }
+
+ database.txLevel = TransactionLevel.Connected;
+ database.connectionCookie = connectionCookie;
+
+ return { connectionCookie };
+ }
+
+ async beginTransaction(
+ conn: DatabaseConnection,
+ objectStores: string[],
+ mode: import("./util/types").TransactionMode,
+ ): Promise<DatabaseTransaction> {
+ const transactionCookie = `tx-${this.transactionIdCounter++}`;
+ const myConn = this.connections[conn.connectionCookie];
+ if (!myConn) {
+ throw Error("connection not found");
+ }
+ const myDb = this.databases[myConn.dbName];
+ if (!myDb) {
+ throw Error("db not found");
+ }
+
+ while (myDb.txLevel !== TransactionLevel.Connected) {
+ await this.transactionDoneCond.wait();
+ }
+
+ if (mode === "readonly") {
+ myDb.txLevel = TransactionLevel.Read;
+ } else if (mode === "readwrite") {
+ myDb.txLevel = TransactionLevel.Write;
+ } else {
+ throw Error("unsupported transaction mode");
+ }
+
+ this.connectionsByTransaction[transactionCookie] = myConn;
+
+ return { transactionCookie };
+ }
+
+ async enterVersionChange(
+ conn: DatabaseConnection,
+ newVersion: number,
+ ): Promise<DatabaseTransaction> {
+ const transactionCookie = `tx-vc-${this.transactionIdCounter++}`;
+ const myConn = this.connections[conn.connectionCookie];
+ if (!myConn) {
+ throw Error("connection not found");
+ }
+ const myDb = this.databases[myConn.dbName];
+ if (!myDb) {
+ throw Error("db not found");
+ }
+
+ while (myDb.txLevel !== TransactionLevel.Connected) {
+ await this.transactionDoneCond.wait();
+ }
+
+ myDb.txLevel = TransactionLevel.VersionChange;
+
+ this.connectionsByTransaction[transactionCookie] = myConn;
+
+ return { transactionCookie };
+ }
+
+ async close(conn: DatabaseConnection): Promise<void> {
+ const myConn = this.connections[conn.connectionCookie];
+ if (!myConn) {
+ throw Error("connection not found - already closed?");
+ }
+ if (!myConn.deleted) {
+ const myDb = this.databases[myConn.dbName];
+ if (myDb.txLevel != TransactionLevel.Connected) {
+ throw Error("invalid state");
+ }
+ myDb.txLevel = TransactionLevel.Disconnected;
+ }
+ delete this.connections[conn.connectionCookie];
+ }
+
+ getSchema(dbConn: DatabaseConnection): Schema {
+ const myConn = this.connections[dbConn.connectionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (myConn.modifiedSchema) {
+ return myConn.modifiedSchema;
+ }
+ return db.committedSchema;
+ }
+
+ renameIndex(
+ btx: DatabaseTransaction,
+ oldName: string,
+ newName: string,
+ ): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ let schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error();
+ }
+ if (schema.indexes[newName]) {
+ throw new Error("new index name already used");
+ }
+ if (!schema.indexes[oldName]) {
+ throw new Error("new index name already used");
+ }
+ const index: Index = myConn.indexMap[oldName];
+ if (!index) {
+ throw Error("old index missing in connection's index map");
+ }
+ schema.indexes[newName] = schema.indexes[newName];
+ delete schema.indexes[oldName];
+ for (const storeName in schema.objectStores) {
+ const store = schema.objectStores[storeName];
+ store.indexes = store.indexes.map(x => {
+ if (x == oldName) {
+ return newName;
+ } else {
+ return x;
+ }
+ });
+ }
+ myConn.indexMap[newName] = index;
+ delete myConn.indexMap[oldName];
+ index.modifiedName = newName;
+ }
+
+ deleteIndex(btx: DatabaseTransaction, indexName: string): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ let schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error();
+ }
+ if (!schema.indexes[indexName]) {
+ throw new Error("index does not exist");
+ }
+ const index: Index = myConn.indexMap[indexName];
+ if (!index) {
+ throw Error("old index missing in connection's index map");
+ }
+ index.deleted = true;
+ delete schema.indexes[indexName];
+ delete myConn.indexMap[indexName];
+ for (const storeName in schema.objectStores) {
+ const store = schema.objectStores[storeName];
+ store.indexes = store.indexes.filter(x => {
+ return x !== indexName;
+ });
+ }
+ }
+
+ deleteObjectStore(btx: DatabaseTransaction, name: string): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ const schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error();
+ }
+ const objectStoreProperties = schema.objectStores[name];
+ if (!objectStoreProperties) {
+ throw Error("object store not found");
+ }
+ const objectStore = myConn.objectStoreMap[name];
+ if (!objectStore) {
+ throw Error("object store not found in map");
+ }
+ const indexNames = objectStoreProperties.indexes;
+ for (const indexName of indexNames) {
+ this.deleteIndex(btx, indexName);
+ }
+
+ objectStore.deleted = true;
+ delete myConn.objectStoreMap[name];
+ delete schema.objectStores[name];
+ }
+
+ renameObjectStore(
+ btx: DatabaseTransaction,
+ oldName: string,
+ newName: string,
+ ): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ const schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error();
+ }
+ if (!schema.objectStores[oldName]) {
+ throw Error("object store not found");
+ }
+ if (schema.objectStores[newName]) {
+ throw Error("new object store already exists");
+ }
+ const objectStore = myConn.objectStoreMap[oldName];
+ if (!objectStore) {
+ throw Error("object store not found in map");
+ }
+ objectStore.modifiedName = newName;
+ schema.objectStores[newName] = schema.objectStores[oldName];
+ delete schema.objectStores[oldName];
+ delete myConn.objectStoreMap[oldName];
+ myConn.objectStoreMap[newName] = objectStore;
+ }
+
+ createObjectStore(
+ btx: DatabaseTransaction,
+ name: string,
+ keyPath: string | string[] | null,
+ autoIncrement: boolean,
+ ): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ const newObjectStore: ObjectStore = {
+ deleted: false,
+ modifiedName: undefined,
+ originalName: name,
+ modifiedData: undefined,
+ originalData: new BTree([], compareKeys),
+ modifiedKeyGenerator: undefined,
+ originalKeyGenerator: 1,
+ };
+ const schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error("no schema for versionchange tx");
+ }
+ schema.objectStores[name] = {
+ autoIncrement,
+ keyPath,
+ indexes: [],
+ };
+ myConn.objectStoreMap[name] = newObjectStore;
+ db.modifiedObjectStores[name] = newObjectStore;
+ }
+
+ createIndex(
+ btx: DatabaseTransaction,
+ indexName: string,
+ objectStoreName: string,
+ keyPath: import("./util/types").KeyPath,
+ multiEntry: boolean,
+ unique: boolean,
+ ): void {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.VersionChange) {
+ throw Error("only allowed in versionchange transaction");
+ }
+ const indexProperties: IndexProperties = {
+ keyPath,
+ multiEntry,
+ unique,
+ };
+ const newIndex: Index = {
+ deleted: false,
+ modifiedData: undefined,
+ modifiedName: undefined,
+ originalData: new BTree([], compareKeys),
+ originalName: indexName,
+ };
+ myConn.indexMap[indexName] = newIndex;
+ db.modifiedIndexes[indexName] = newIndex;
+ const schema = myConn.modifiedSchema;
+ if (!schema) {
+ throw Error("no schema in versionchange tx");
+ }
+ const objectStoreProperties = schema.objectStores[objectStoreName];
+ if (!objectStoreProperties) {
+ throw Error("object store not found");
+ }
+ objectStoreProperties.indexes.push(indexName);
+ schema.indexes[indexName] = indexProperties;
+
+ // FIXME: build index from existing object store!
+ }
+
+ async deleteRecord(
+ btx: DatabaseTransaction,
+ objectStoreName: string,
+ range: import("./BridgeIDBKeyRange").default,
+ ): Promise<void> {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.Write) {
+ throw Error("only allowed in write transaction");
+ }
+ }
+
+ async getRecords(
+ btx: DatabaseTransaction,
+ req: import("./backend-interface").RecordGetRequest,
+ ): Promise<import("./backend-interface").RecordGetResponse> {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.Write) {
+ throw Error("only allowed while running a transaction");
+ }
+ throw Error("not implemented");
+ }
+
+ async storeRecord(
+ btx: DatabaseTransaction,
+ storeReq: RecordStoreRequest,
+ ): Promise<void> {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.Write) {
+ throw Error("only allowed while running a transaction");
+ }
+ const schema = myConn.modifiedSchema
+ ? myConn.modifiedSchema
+ : db.committedSchema;
+
+ const objectStore = myConn.objectStoreMap[storeReq.objectStoreName];
+
+ const storeKeyResult: StoreKeyResult = getStoreKey(
+ storeReq.value,
+ storeReq.key,
+ objectStore.modifiedKeyGenerator || objectStore.originalKeyGenerator,
+ schema.objectStores[storeReq.objectStoreName].autoIncrement,
+ schema.objectStores[storeReq.objectStoreName].keyPath,
+ );
+ let key = storeKeyResult.key;
+ let value = storeKeyResult.value;
+ objectStore.modifiedKeyGenerator = storeKeyResult.updatedKeyGenerator;
+
+ if (!objectStore.modifiedData) {
+ objectStore.modifiedData = objectStore.originalData;
+ }
+ const modifiedData = objectStore.modifiedData;
+ const hasKey = modifiedData.has(key);
+ if (hasKey && !storeReq.overwrite) {
+ throw Error("refusing to overwrite");
+ }
+
+ objectStore.modifiedData = modifiedData.with(key, value, true);
+
+ for (const indexName of schema.objectStores[storeReq.objectStoreName]
+ .indexes) {
+ const index = myConn.indexMap[indexName];
+ if (!index) {
+ throw Error("index referenced by object store does not exist");
+ }
+ const indexProperties = schema.indexes[indexName];
+ insertIntoIndex(index, value, indexProperties);
+ }
+ }
+
+ async rollback(btx: DatabaseTransaction): Promise<void> {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.Read) {
+ throw Error("only allowed while running a transaction");
+ }
+ db.modifiedIndexes = {};
+ db.modifiedObjectStores = {};
+ db.txLevel = TransactionLevel.Connected;
+ myConn.modifiedSchema = structuredClone(db.committedSchema);
+ myConn.indexMap = Object.assign({}, db.committedIndexes);
+ myConn.objectStoreMap = Object.assign({}, db.committedObjectStores);
+ for (const indexName in db.committedIndexes) {
+ const index = db.committedIndexes[indexName];
+ index.deleted = false;
+ index.modifiedData = undefined;
+ index.modifiedName = undefined;
+ }
+ for (const objectStoreName in db.committedObjectStores) {
+ const objectStore = db.committedObjectStores[objectStoreName];
+ objectStore.deleted = false;
+ objectStore.modifiedData = undefined;
+ objectStore.modifiedName = undefined;
+ objectStore.modifiedKeyGenerator = undefined;
+ }
+ }
+
+ async commit(btx: DatabaseTransaction): Promise<void> {
+ const myConn = this.connections[btx.transactionCookie];
+ if (!myConn) {
+ throw Error("unknown connection");
+ }
+ const db = this.databases[myConn.dbName];
+ if (!db) {
+ throw Error("db not found");
+ }
+ if (db.txLevel < TransactionLevel.Read) {
+ throw Error("only allowed while running a transaction");
+ }
+ }
+}
+
+export default MemoryBackend;
diff --git a/packages/idb-bridge/src/backend-interface.ts
b/packages/idb-bridge/src/backend-interface.ts
new file mode 100644
index 00000000..c0f498a1
--- /dev/null
+++ b/packages/idb-bridge/src/backend-interface.ts
@@ -0,0 +1,145 @@
+import {
+ TransactionMode,
+ Value,
+ BridgeIDBCursorDirection,
+ Key,
+ KeyPath,
+ BridgeIDBDatabaseInfo,
+} from "./util/types";
+import BridgeIDBKeyRange from "./BridgeIDBKeyRange";
+
+export interface ObjectStoreProperties {
+ keyPath: KeyPath | null;
+ autoIncrement: boolean;
+ indexes: string[];
+}
+
+export interface IndexProperties {
+ keyPath: KeyPath;
+ multiEntry: boolean;
+ unique: boolean;
+}
+
+export interface Schema {
+ databaseName: string;
+ databaseVersion: number;
+ objectStores: { [name: string]: ObjectStoreProperties };
+ indexes: { [name: string]: IndexProperties };
+}
+
+export interface DatabaseConnection {
+ connectionCookie: string;
+}
+
+export interface DatabaseTransaction {
+ transactionCookie: string;
+}
+
+export enum ResultLevel {
+ Full,
+ OnlyKeys,
+ OnlyCount,
+}
+
+export interface RecordGetRequest {
+ direction: BridgeIDBCursorDirection;
+ objectStoreName: string;
+ indexName: string | undefined;
+ range: BridgeIDBKeyRange | undefined;
+ lastIndexPosition?: Key;
+ lastObjectStorePosition?: Key;
+ advanceIndexKey?: Key;
+ advancePrimaryKey?: Key;
+ limit: number;
+ resultLevel: ResultLevel;
+}
+
+export interface RecordGetResponse {
+ values: Value[] | undefined;
+ keys: Key[] | undefined;
+ primaryKeys: Key[] | undefined;
+ count: number;
+}
+
+export interface RecordStoreRequest {
+ objectStoreName: string;
+ value: Value;
+ key: Key | undefined;
+ overwrite: boolean;
+}
+
+export interface Backend {
+ getDatabases(): Promise<BridgeIDBDatabaseInfo[]>;
+
+ connectDatabase(name: string): Promise<DatabaseConnection>;
+
+ beginTransaction(
+ conn: DatabaseConnection,
+ objectStores: string[],
+ mode: TransactionMode,
+ ): Promise<DatabaseTransaction>;
+
+ enterVersionChange(
+ conn: DatabaseConnection,
+ newVersion: number,
+ ): Promise<DatabaseTransaction>;
+
+ /**
+ * Even though the standard interface for indexedDB doesn't require
+ * the client to run deleteDatabase in a version transaction, there is
+ * implicitly one running.
+ */
+ deleteDatabase(btx: DatabaseTransaction, name: string): Promise<void>;
+
+ close(db: DatabaseConnection): Promise<void>;
+
+ getSchema(db: DatabaseConnection): Schema;
+
+ renameIndex(btx: DatabaseTransaction, oldName: string, newName: string):
void;
+
+ deleteIndex(btx: DatabaseTransaction, indexName: string): void;
+
+ rollback(btx: DatabaseTransaction): Promise<void>;
+
+ commit(btx: DatabaseTransaction): Promise<void>;
+
+ deleteObjectStore(btx: DatabaseTransaction, name: string): void;
+
+ createObjectStore(
+ btx: DatabaseTransaction,
+ name: string,
+ keyPath: string | string[] | null,
+ autoIncrement: boolean,
+ ): void;
+
+ renameObjectStore(
+ btx: DatabaseTransaction,
+ oldName: string,
+ newName: string,
+ ): void;
+
+ createIndex(
+ btx: DatabaseTransaction,
+ indexName: string,
+ objectStoreName: string,
+ keyPath: KeyPath,
+ multiEntry: boolean,
+ unique: boolean,
+ ): void;
+
+ deleteRecord(
+ btx: DatabaseTransaction,
+ objectStoreName: string,
+ range: BridgeIDBKeyRange,
+ ): Promise<void>;
+
+ getRecords(
+ btx: DatabaseTransaction,
+ req: RecordGetRequest,
+ ): Promise<RecordGetResponse>;
+
+ storeRecord(
+ btx: DatabaseTransaction,
+ storeReq: RecordStoreRequest,
+ ): Promise<void>;
+}
diff --git a/packages/idb-bridge/src/tree/b+tree.ts
b/packages/idb-bridge/src/tree/b+tree.ts
new file mode 100644
index 00000000..01187cdc
--- /dev/null
+++ b/packages/idb-bridge/src/tree/b+tree.ts
@@ -0,0 +1,1351 @@
+/*
+Copyright (c) 2018 David Piepgrass
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+SPDX-License-Identifier: MIT
+*/
+
+// Original repository: https://github.com/qwertie/btree-typescript
+
+
+import { ISortedMap, ISortedMapF } from './interfaces';
+export {
+ ISetSource, ISetSink, ISet, ISetF, ISortedSetSource, ISortedSet, ISortedSetF,
+ IMapSource, IMapSink, IMap, IMapF, ISortedMapSource, ISortedMap, ISortedMapF
+} from './interfaces';
+
+export type EditRangeResult<V,R=number> = {value?:V, break?:R,
delete?:boolean};
+
+type index = number;
+
+// Informative microbenchmarks & stuff:
+// http://www.jayconrod.com/posts/52/a-tour-of-v8-object-representation (very
educational)
+//
https://blog.mozilla.org/luke/2012/10/02/optimizing-javascript-variable-access/
(local vars are faster than properties)
+//
http://benediktmeurer.de/2017/12/13/an-introduction-to-speculative-optimization-in-v8/
(other stuff)
+// https://jsperf.com/js-in-operator-vs-alternatives (avoid 'in' operator;
`.p!==undefined` faster than `hasOwnProperty('p')` in all browsers)
+// https://jsperf.com/instanceof-vs-typeof-vs-constructor-vs-member (speed of
type tests varies wildly across browsers)
+// https://jsperf.com/detecting-arrays-new (a.constructor===Array is best
across browsers, assuming a is an object)
+// https://jsperf.com/shallow-cloning-methods (a constructor is faster than
Object.create; hand-written clone faster than Object.assign)
+// https://jsperf.com/ways-to-fill-an-array (slice-and-replace is fastest)
+// https://jsperf.com/math-min-max-vs-ternary-vs-if (Math.min/max is slow on
Edge)
+// https://jsperf.com/array-vs-property-access-speed (v.x/v.y is faster than
a[0]/a[1] in major browsers IF hidden class is constant)
+// https://jsperf.com/detect-not-null-or-undefined (`x==null` slightly slower
than `x===null||x===undefined` on all browsers)
+// Overall, microbenchmarks suggest Firefox is the fastest browser for
JavaScript and Edge is the slowest.
+// Lessons from
https://v8project.blogspot.com/2017/09/elements-kinds-in-v8.html:
+// - Avoid holes in arrays. Avoid `new Array(N)`, it will be "holey"
permanently.
+// - Don't read outside bounds of an array (it scans prototype chain).
+// - Small integer arrays are stored differently from doubles
+// - Adding non-numbers to an array deoptimizes it permanently into a
general array
+// - Objects can be used like arrays (e.g. have length property) but are
slower
+// - V8 source (NewElementsCapacity in src/objects.h): arrays grow by 50% +
16 elements
+
+/** Compares two numbers, strings, arrays of numbers/strings, Dates,
+ * or objects that have a valueOf() method returning a number or string.
+ * Optimized for numbers. Returns 1 if a>b, -1 if a<b, and 0 if a===b.
+ */
+export function defaultComparator(a: any, b: any) {
+ var c = a - b;
+ if (c === c) return c; // a & b are number
+ // General case (c is NaN): string / arrays / Date / incomparable things
+ if (a) a = a.valueOf();
+ if (b) b = b.valueOf();
+ return a < b ? -1 : a > b ? 1 : a == b ? 0 : c;
+};
+
+/**
+ * A reasonably fast collection of key-value pairs with a powerful API.
+ * Largely compatible with the standard Map. BTree is a B+ tree data structure,
+ * so the collection is sorted by key.
+ *
+ * B+ trees tend to use memory more efficiently than hashtables such as the
+ * standard Map, especially when the collection contains a large number of
+ * items. However, maintaining the sort order makes them modestly slower:
+ * O(log size) rather than O(1). This B+ tree implementation supports O(1)
+ * fast cloning. It also supports freeze(), which can be used to ensure that
+ * a BTree is not changed accidentally.
+ *
+ * Confusingly, the ES6 Map.forEach(c) method calls c(value,key) instead of
+ * c(key,value), in contrast to other methods such as set() and entries()
+ * which put the key first. I can only assume that the order was reversed on
+ * the theory that users would usually want to examine values and ignore keys.
+ * BTree's forEach() therefore works the same way, but a second method
+ * `.forEachPair((key,value)=>{...})` is provided which sends you the key
+ * first and the value second; this method is slightly faster because it is
+ * the "native" for-each method for this class.
+ *
+ * Out of the box, BTree supports keys that are numbers, strings, arrays of
+ * numbers/strings, Date, and objects that have a valueOf() method returning a
+ * number or string. Other data types, such as arrays of Date or custom
+ * objects, require a custom comparator, which you must pass as the second
+ * argument to the constructor (the first argument is an optional list of
+ * initial items). Symbols cannot be used as keys because they are unordered
+ * (one Symbol is never "greater" or "less" than another).
+ *
+ * @example
+ * Given a {name: string, age: number} object, you can create a tree sorted by
+ * name and then by age like this:
+ *
+ * var tree = new BTree(undefined, (a, b) => {
+ * if (a.name > b.name)
+ * return 1; // Return a number >0 when a > b
+ * else if (a.name < b.name)
+ * return -1; // Return a number <0 when a < b
+ * else // names are equal (or incomparable)
+ * return a.age - b.age; // Return >0 when a.age > b.age
+ * });
+ *
+ * tree.set({name:"Bill", age:17}, "happy");
+ * tree.set({name:"Fran", age:40}, "busy & stressed");
+ * tree.set({name:"Bill", age:55}, "recently laid off");
+ * tree.forEachPair((k, v) => {
+ * console.log(`Name: ${k.name} Age: ${k.age} Status: ${v}`);
+ * });
+ *
+ * @description
+ * The "range" methods (`forEach, forRange, editRange`) will return the number
+ * of elements that were scanned. In addition, the callback can return
{break:R}
+ * to stop early and return R from the outer function.
+ *
+ * - TODO: Test performance of preallocating values array at max size
+ * - TODO: Add fast initialization when a sorted array is provided to
constructor
+ *
+ * For more documentation see https://github.com/qwertie/btree-typescript
+ *
+ * Are you a C# developer? You might like the similar data structures I made
for C#:
+ * BDictionary, BList, etc. See http://core.loyc.net/collections/
+ *
+ * @author David Piepgrass
+ */
+export default class BTree<K=any, V=any> implements ISortedMapF<K,V>,
ISortedMap<K,V>
+{
+ private _root: BNode<K, V> = EmptyLeaf as BNode<K,V>;
+ _size: number = 0;
+ _maxNodeSize: number;
+ _compare: (a:K, b:K) => number;
+
+ /**
+ * Initializes an empty B+ tree.
+ * @param compare Custom function to compare pairs of elements in the tree.
+ * This is not required for numbers, strings and arrays of numbers/strings.
+ * @param entries A set of key-value pairs to initialize the tree
+ * @param maxNodeSize Branching factor (maximum items or children per node)
+ * Must be in range 4..256. If undefined or <4 then default is used; if
>256 then 256.
+ */
+ public constructor(entries?: [K,V][], compare?: (a: K, b: K) => number,
maxNodeSize?: number) {
+ this._maxNodeSize = maxNodeSize! >= 4 ? Math.min(maxNodeSize!, 256) : 32;
+ this._compare = compare || defaultComparator;
+ if (entries)
+ this.setPairs(entries);
+ }
+
+ // ES6 Map<K,V> methods ///////////////////////////////////////////////////
+
+ /** Gets the number of key-value pairs in the tree. */
+ get size() { return this._size; }
+ /** Gets the number of key-value pairs in the tree. */
+ get length() { return this._size; }
+ /** Returns true iff the tree contains no key-value pairs. */
+ get isEmpty() { return this._size === 0; }
+
+ /** Releases the tree so that its size is 0. */
+ clear() {
+ this._root = EmptyLeaf as BNode<K,V>;
+ this._size = 0;
+ }
+
+ forEach(callback: (v:V, k:K, tree:BTree<K,V>) => void, thisArg?: any):
number;
+
+ /** Runs a function for each key-value pair, in order from smallest to
+ * largest key. For compatibility with ES6 Map, the argument order to
+ * the callback is backwards: value first, then key. Call forEachPair
+ * instead to receive the key as the first argument.
+ * @param thisArg If provided, this parameter is assigned as the `this`
+ * value for each callback.
+ * @returns the number of values that were sent to the callback,
+ * or the R value if the callback returned {break:R}. */
+ forEach<R=number>(callback: (v:V, k:K, tree:BTree<K,V>) => {break?:R}|void,
thisArg?: any): R|number {
+ if (thisArg !== undefined)
+ callback = callback.bind(thisArg);
+ return this.forEachPair((k, v) => callback(v, k, this));
+ }
+
+ /** Runs a function for each key-value pair, in order from smallest to
+ * largest key. The callback can return {break:R} (where R is any value
+ * except undefined) to stop immediately and return R from forEachPair.
+ * @param onFound A function that is called for each key-value pair. This
+ * function can return {break:R} to stop early with result R.
+ * The reason that you must return {break:R} instead of simply R
+ * itself is for consistency with editRange(), which allows
+ * multiple actions, not just breaking.
+ * @param initialCounter This is the value of the third argument of
+ * `onFound` the first time it is called. The counter increases
+ * by one each time `onFound` is called. Default value: 0
+ * @returns the number of pairs sent to the callback (plus initialCounter,
+ * if you provided one). If the callback returned {break:R} then
+ * the R value is returned instead. */
+ forEachPair<R=number>(callback: (k:K, v:V, counter:number) =>
{break?:R}|void, initialCounter?: number): R|number {
+ var low = this.minKey(), high = this.maxKey();
+ return this.forRange(low!, high!, true, callback, initialCounter);
+ }
+
+ /**
+ * Finds a pair in the tree and returns the associated value.
+ * @param defaultValue a value to return if the key was not found.
+ * @returns the value, or defaultValue if the key was not found.
+ * @description Computational complexity: O(log size)
+ */
+ get(key: K, defaultValue?: V): V | undefined {
+ return this._root.get(key, defaultValue, this);
+ }
+
+ /**
+ * Adds or overwrites a key-value pair in the B+ tree.
+ * @param key the key is used to determine the sort order of
+ * data in the tree.
+ * @param value data to associate with the key (optional)
+ * @param overwrite Whether to overwrite an existing key-value pair
+ * (default: true). If this is false and there is an existing
+ * key-value pair then this method has no effect.
+ * @returns true if a new key-value pair was added.
+ * @description Computational complexity: O(log size)
+ * Note: when overwriting a previous entry, the key is updated
+ * as well as the value. This has no effect unless the new key
+ * has data that does not affect its sort order.
+ */
+ set(key: K, value: V, overwrite?: boolean): boolean {
+ if (this._root.isShared)
+ this._root = this._root.clone();
+ var result = this._root.set(key, value, overwrite, this);
+ if (result === true || result === false)
+ return result;
+ // Root node has split, so create a new root node.
+ this._root = new BNodeInternal<K,V>([this._root, result]);
+ return true;
+ }
+
+ /**
+ * Returns true if the key exists in the B+ tree, false if not.
+ * Use get() for best performance; use has() if you need to
+ * distinguish between "undefined value" and "key not present".
+ * @param key Key to detect
+ * @description Computational complexity: O(log size)
+ */
+ has(key: K): boolean {
+ return this.forRange(key, key, true, undefined) !== 0;
+ }
+
+ /**
+ * Removes a single key-value pair from the B+ tree.
+ * @param key Key to find
+ * @returns true if a pair was found and removed, false otherwise.
+ * @description Computational complexity: O(log size)
+ */
+ delete(key: K): boolean {
+ return this.editRange(key, key, true, DeleteRange) !== 0;
+ }
+
+ // Clone-mutators /////////////////////////////////////////////////////////
+
+ /** Returns a copy of the tree with the specified key set (the value is
undefined). */
+ with(key: K): BTree<K,V|undefined>;
+ /** Returns a copy of the tree with the specified key-value pair set. */
+ with<V2>(key: K, value: V2, overwrite?: boolean): BTree<K,V|V2>;
+ with<V2>(key: K, value?: V2, overwrite?: boolean): BTree<K,V|V2|undefined> {
+ let nu = this.clone() as BTree<K,V|V2|undefined>;
+ return nu.set(key, value, overwrite) || overwrite ? nu : this;
+ }
+
+ /** Returns a copy of the tree with the specified key-value pairs set. */
+ withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): BTree<K,V|V2> {
+ let nu = this.clone() as BTree<K,V|V2>;
+ return nu.setPairs(pairs, overwrite) !== 0 || overwrite ? nu : this;
+ }
+
+ /** Returns a copy of the tree with the specified keys present.
+ * @param keys The keys to add. If a key is already present in the tree,
+ * neither the existing key nor the existing value is modified.
+ * @param returnThisIfUnchanged if true, returns this if all keys already
+ * existed. Performance note: due to the architecture of this class, all
+ * node(s) leading to existing keys are cloned even if the collection is
+ * ultimately unchanged.
+ */
+ withKeys(keys: K[], returnThisIfUnchanged?: boolean): BTree<K,V|undefined> {
+ let nu = this.clone() as BTree<K,V|undefined>, changed = false;
+ for (var i = 0; i < keys.length; i++)
+ changed = nu.set(keys[i], undefined, false) || changed;
+ return returnThisIfUnchanged && !changed ? this : nu;
+ }
+
+ /** Returns a copy of the tree with the specified key removed.
+ * @param returnThisIfUnchanged if true, returns this if the key didn't
exist.
+ * Performance note: due to the architecture of this class, node(s) leading
+ * to where the key would have been stored are cloned even when the key
+ * turns out not to exist and the collection is unchanged.
+ */
+ without(key: K, returnThisIfUnchanged?: boolean): BTree<K,V> {
+ return this.withoutRange(key, key, true, returnThisIfUnchanged);
+ }
+
+ /** Returns a copy of the tree with the specified keys removed.
+ * @param returnThisIfUnchanged if true, returns this if none of the keys
+ * existed. Performance note: due to the architecture of this class,
+ * node(s) leading to where the key would have been stored are cloned
+ * even when the key turns out not to exist.
+ */
+ withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): BTree<K,V> {
+ let nu = this.clone();
+ return nu.deleteKeys(keys) || !returnThisIfUnchanged ? nu : this;
+ }
+
+ /** Returns a copy of the tree with the specified range of keys removed. */
+ withoutRange(low: K, high: K, includeHigh: boolean, returnThisIfUnchanged?:
boolean): BTree<K,V> {
+ let nu = this.clone();
+ if (nu.deleteRange(low, high, includeHigh) === 0 && returnThisIfUnchanged)
+ return this;
+ return nu;
+ }
+
+ /** Returns a copy of the tree with pairs removed whenever the callback
+ * function returns false. `where()` is a synonym for this method. */
+ filter(callback: (k:K,v:V,counter:number) => boolean,
returnThisIfUnchanged?: boolean): BTree<K,V> {
+ var nu = this.greedyClone();
+ var del: any;
+ nu.editAll((k,v,i) => {
+ if (!callback(k, v, i)) return del = Delete;
+ });
+ if (!del && returnThisIfUnchanged)
+ return this;
+ return nu;
+ }
+
+ /** Returns a copy of the tree with all values altered by a callback
function. */
+ mapValues<R>(callback: (v:V,k:K,counter:number) => R): BTree<K,R> {
+ var tmp = {} as {value:R};
+ var nu = this.greedyClone();
+ nu.editAll((k,v,i) => {
+ return tmp.value = callback(v, k, i), tmp as any;
+ });
+ return nu as any as BTree<K,R>;
+ }
+
+ /** Performs a reduce operation like the `reduce` method of `Array`.
+ * It is used to combine all pairs into a single value, or perform
+ * conversions. `reduce` is best understood by example. For example,
+ * `tree.reduce((P, pair) => P * pair[0], 1)` multiplies all keys
+ * together. It means "start with P=1, and for each pair multiply
+ * it by the key in pair[0]". Another example would be converting
+ * the tree to a Map (in this example, note that M.set returns M):
+ *
+ * var M = tree.reduce((M, pair) => M.set(pair[0],pair[1]), new Map())
+ *
+ * **Note**: the same array is sent to the callback on every iteration.
+ */
+ reduce<R>(callback:
(previous:R,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R,
initialValue: R): R;
+ reduce<R>(callback:
(previous:R|undefined,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R):
R|undefined;
+ reduce<R>(callback:
(previous:R|undefined,currentPair:[K,V],counter:number,tree:BTree<K,V>) => R,
initialValue?: R): R|undefined {
+ let i = 0, p = initialValue;
+ var it = this.entries(this.minKey(), ReusedArray), next;
+ while (!(next = it.next()).done)
+ p = callback(p, next.value, i++, this);
+ return p;
+ }
+
+ // Iterator methods ///////////////////////////////////////////////////////
+
+ /** Returns an iterator that provides items in order (ascending order if
+ * the collection's comparator uses ascending order, as is the default.)
+ * @param lowestKey First key to be iterated, or undefined to start at
+ * minKey(). If the specified key doesn't exist then iteration
+ * starts at the next higher key (according to the comparator).
+ * @param reusedArray Optional array used repeatedly to store key-value
+ * pairs, to avoid creating a new array on every iteration.
+ */
+ entries(lowestKey?: K, reusedArray?: (K|V)[]): IterableIterator<[K,V]> {
+ var info = this.findPath(lowestKey);
+ if (info === undefined) return iterator<[K,V]>();
+ var {nodequeue, nodeindex, leaf} = info;
+ var state = reusedArray !== undefined ? 1 : 0;
+ var i = (lowestKey === undefined ? -1 : leaf.indexOf(lowestKey, 0,
this._compare) - 1);
+
+ return iterator<[K,V]>(() => {
+ jump: for (;;) {
+ switch(state) {
+ case 0:
+ if (++i < leaf.keys.length)
+ return {done: false, value: [leaf.keys[i], leaf.values[i]]};
+ state = 2;
+ continue;
+ case 1:
+ if (++i < leaf.keys.length) {
+ reusedArray![0] = leaf.keys[i], reusedArray![1] = leaf.values[i];
+ return {done: false, value: reusedArray as [K,V]};
+ }
+ state = 2;
+ case 2:
+ // Advance to the next leaf node
+ for (var level = -1;;) {
+ if (++level >= nodequeue.length) {
+ state = 3; continue jump;
+ }
+ if (++nodeindex[level] < nodequeue[level].length)
+ break;
+ }
+ for (; level > 0; level--) {
+ nodequeue[level-1] = (nodequeue[level][nodeindex[level]] as
BNodeInternal<K,V>).children;
+ nodeindex[level-1] = 0;
+ }
+ leaf = nodequeue[0][nodeindex[0]];
+ i = -1;
+ state = reusedArray !== undefined ? 1 : 0;
+ continue;
+ case 3:
+ return {done: true, value: undefined};
+ }
+ }
+ });
+ }
+
+ /** Returns an iterator that provides items in reversed order.
+ * @param highestKey Key at which to start iterating, or undefined to
+ * start at minKey(). If the specified key doesn't exist then
iteration
+ * starts at the next lower key (according to the comparator).
+ * @param reusedArray Optional array used repeatedly to store key-value
+ * pairs, to avoid creating a new array on every iteration.
+ * @param skipHighest Iff this flag is true and the highestKey exists in the
+ * collection, the pair matching highestKey is skipped, not iterated.
+ */
+ entriesReversed(highestKey?: K, reusedArray?: (K|V)[], skipHighest?:
boolean): IterableIterator<[K,V]> {
+ if ((highestKey = highestKey || this.maxKey()) === undefined)
+ return iterator<[K,V]>(); // collection is empty
+ var {nodequeue,nodeindex,leaf} = this.findPath(highestKey) ||
this.findPath(this.maxKey())!;
+ check(!nodequeue[0] || leaf === nodequeue[0][nodeindex[0]], "wat!");
+ var i = leaf.indexOf(highestKey, 0, this._compare);
+ if (!(skipHighest || this._compare(leaf.keys[i], highestKey) > 0))
+ i++;
+ var state = reusedArray !== undefined ? 1 : 0;
+
+ return iterator<[K,V]>(() => {
+ jump: for (;;) {
+ switch(state) {
+ case 0:
+ if (--i >= 0)
+ return {done: false, value: [leaf.keys[i], leaf.values[i]]};
+ state = 2;
+ continue;
+ case 1:
+ if (--i >= 0) {
+ reusedArray![0] = leaf.keys[i], reusedArray![1] = leaf.values[i];
+ return {done: false, value: reusedArray as [K,V]};
+ }
+ state = 2;
+ case 2:
+ // Advance to the next leaf node
+ for (var level = -1;;) {
+ if (++level >= nodequeue.length) {
+ state = 3; continue jump;
+ }
+ if (--nodeindex[level] >= 0)
+ break;
+ }
+ for (; level > 0; level--) {
+ nodequeue[level-1] = (nodequeue[level][nodeindex[level]] as
BNodeInternal<K,V>).children;
+ nodeindex[level-1] = nodequeue[level-1].length-1;
+ }
+ leaf = nodequeue[0][nodeindex[0]];
+ i = leaf.keys.length;
+ state = reusedArray !== undefined ? 1 : 0;
+ continue;
+ case 3:
+ return {done: true, value: undefined};
+ }
+ }
+ });
+ }
+
+ /* Used by entries() and entriesReversed() to prepare to start iterating.
+ * It develops a "node queue" for each non-leaf level of the tree.
+ * Levels are numbered "bottom-up" so that level 0 is a list of leaf
+ * nodes from a low-level non-leaf node. The queue at a given level L
+ * consists of nodequeue[L] which is the children of a BNodeInternal,
+ * and nodeindex[L], the current index within that child list, such
+ * such that nodequeue[L-1] === nodequeue[L][nodeindex[L]].children.
+ * (However inside this function the order is reversed.)
+ */
+ private findPath(key?: K): { nodequeue: BNode<K,V>[][], nodeindex: number[],
leaf: BNode<K,V> } | undefined
+ {
+ var nextnode = this._root;
+ var nodequeue: BNode<K,V>[][], nodeindex: number[];
+
+ if (nextnode.isLeaf) {
+ nodequeue = EmptyArray, nodeindex = EmptyArray; // avoid allocations
+ } else {
+ nodequeue = [], nodeindex = [];
+ for (var d = 0; !nextnode.isLeaf; d++) {
+ nodequeue[d] = (nextnode as BNodeInternal<K,V>).children;
+ nodeindex[d] = key === undefined ? 0 : nextnode.indexOf(key, 0,
this._compare);
+ if (nodeindex[d] >= nodequeue[d].length)
+ return; // first key > maxKey()
+ nextnode = nodequeue[d][nodeindex[d]];
+ }
+ nodequeue.reverse();
+ nodeindex.reverse();
+ }
+ return {nodequeue, nodeindex, leaf:nextnode};
+ }
+
+ /** Returns a new iterator for iterating the keys of each pair in ascending
order.
+ * @param firstKey: Minimum key to include in the output. */
+ keys(firstKey?: K): IterableIterator<K> {
+ var it = this.entries(firstKey, ReusedArray);
+ return iterator<K>(() => {
+ var n: IteratorResult<any> = it.next();
+ if (n.value) n.value = n.value[0];
+ return n;
+ });
+ }
+
+ /** Returns a new iterator for iterating the values of each pair in order by
key.
+ * @param firstKey: Minimum key whose associated value is included in the
output. */
+ values(firstKey?: K): IterableIterator<V> {
+ var it = this.entries(firstKey, ReusedArray);
+ return iterator<V>(() => {
+ var n: IteratorResult<any> = it.next();
+ if (n.value) n.value = n.value[1];
+ return n;
+ });
+ }
+
+ // Additional methods /////////////////////////////////////////////////////
+
+ /** Returns the maximum number of children/values before nodes will split. */
+ get maxNodeSize() {
+ return this._maxNodeSize;
+ }
+
+ /** Gets the lowest key in the tree. Complexity: O(log size) */
+ minKey(): K | undefined { return this._root.minKey(); }
+
+ /** Gets the highest key in the tree. Complexity: O(1) */
+ maxKey(): K | undefined { return this._root.maxKey(); }
+
+ /** Quickly clones the tree by marking the root node as shared.
+ * Both copies remain editable. When you modify either copy, any
+ * nodes that are shared (or potentially shared) between the two
+ * copies are cloned so that the changes do not affect other copies.
+ * This is known as copy-on-write behavior, or "lazy copying". */
+ clone(): BTree<K,V> {
+ this._root.isShared = true;
+ var result = new BTree<K,V>(undefined, this._compare, this._maxNodeSize);
+ result._root = this._root;
+ result._size = this._size;
+ return result;
+ }
+
+ /** Performs a greedy clone, immediately duplicating any nodes that are
+ * not currently marked as shared, in order to avoid marking any nodes
+ * as shared.
+ * @param force Clone all nodes, even shared ones.
+ */
+ greedyClone(force?: boolean): BTree<K,V> {
+ var result = new BTree<K,V>(undefined, this._compare, this._maxNodeSize);
+ result._root = this._root.greedyClone(force);
+ result._size = this._size;
+ return result;
+ }
+
+ /** Gets an array filled with the contents of the tree, sorted by key */
+ toArray(maxLength: number = 0x7FFFFFFF): [K,V][] {
+ let min = this.minKey(), max = this.maxKey();
+ if (min !== undefined)
+ return this.getRange(min, max!, true, maxLength)
+ return [];
+ }
+
+ /** Gets an array of all keys, sorted */
+ keysArray() {
+ var results: K[] = [];
+ this._root.forRange(this.minKey()!, this.maxKey()!, true, false, this, 0,
+ (k,v) => { results.push(k); });
+ return results;
+ }
+
+ /** Gets an array of all values, sorted by key */
+ valuesArray() {
+ var results: V[] = [];
+ this._root.forRange(this.minKey()!, this.maxKey()!, true, false, this, 0,
+ (k,v) => { results.push(v); });
+ return results;
+ }
+
+ /** Gets a string representing the tree's data based on toArray(). */
+ toString() {
+ return this.toArray().toString();
+ }
+
+ /** Stores a key-value pair only if the key doesn't already exist in the
tree.
+ * @returns true if a new key was added
+ */
+ setIfNotPresent(key: K, value: V): boolean {
+ return this.set(key, value, false);
+ }
+
+ /** Returns the next pair whose key is larger than the specified key (or
undefined if there is none) */
+ nextHigherPair(key: K): [K,V]|undefined {
+ var it = this.entries(key, ReusedArray);
+ var r = it.next();
+ if (!r.done && this._compare(r.value[0], key) <= 0)
+ r = it.next();
+ return r.value;
+ }
+
+ /** Returns the next key larger than the specified key (or undefined if
there is none) */
+ nextHigherKey(key: K): K|undefined {
+ var p = this.nextHigherPair(key);
+ return p ? p[0] : p;
+ }
+
+ /** Returns the next pair whose key is smaller than the specified key (or
undefined if there is none) */
+ nextLowerPair(key: K): [K,V]|undefined {
+ var it = this.entriesReversed(key, ReusedArray, true);
+ return it.next().value;
+ }
+
+ /** Returns the next key smaller than the specified key (or undefined if
there is none) */
+ nextLowerKey(key: K): K|undefined {
+ var p = this.nextLowerPair(key);
+ return p ? p[0] : p;
+ }
+
+ /** Edits the value associated with a key in the tree, if it already exists.
+ * @returns true if the key existed, false if not.
+ */
+ changeIfPresent(key: K, value: V): boolean {
+ return this.editRange(key, key, true, (k,v) => ({value})) !== 0;
+ }
+
+ /**
+ * Builds an array of pairs from the specified range of keys, sorted by key.
+ * Each returned pair is also an array: pair[0] is the key, pair[1] is the
value.
+ * @param low The first key in the array will be greater than or equal to
`low`.
+ * @param high This method returns when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present, its pair will be included
+ * in the output if and only if this parameter is true. Note: if the
+ * `low` key is present, it is always included in the output.
+ * @param maxLength Length limit. getRange will stop scanning the tree when
+ * the array reaches this size.
+ * @description Computational complexity: O(result.length + log size)
+ */
+ getRange(low: K, high: K, includeHigh?: boolean, maxLength: number =
0x3FFFFFF): [K,V][] {
+ var results: [K,V][] = [];
+ this._root.forRange(low, high, includeHigh, false, this, 0, (k,v) => {
+ results.push([k,v])
+ return results.length > maxLength ? Break : undefined;
+ });
+ return results;
+ }
+
+ /** Adds all pairs from a list of key-value pairs.
+ * @param pairs Pairs to add to this tree. If there are duplicate keys,
+ * later pairs currently overwrite earlier ones (e.g. [[0,1],[0,7]]
+ * associates 0 with 7.)
+ * @param overwrite Whether to overwrite pairs that already exist (if false,
+ * pairs[i] is ignored when the key pairs[i][0] already exists.)
+ * @returns The number of pairs added to the collection.
+ * @description Computational complexity: O(pairs.length * log(size +
pairs.length))
+ */
+ setPairs(pairs: [K,V][], overwrite?: boolean): number {
+ var added = 0;
+ for (var i = 0; i < pairs.length; i++)
+ if (this.set(pairs[i][0], pairs[i][1], overwrite))
+ added++;
+ return added;
+ }
+
+ forRange(low: K, high: K, includeHigh: boolean, onFound?:
(k:K,v:V,counter:number) => void, initialCounter?: number): number;
+
+ /**
+ * Scans the specified range of keys, in ascending order by key.
+ * Note: the callback `onFound` must not insert or remove items in the
+ * collection. Doing so may cause incorrect data to be sent to the
+ * callback afterward.
+ * @param low The first key scanned will be greater than or equal to `low`.
+ * @param high Scanning stops when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present, `onFound` is called for
+ * that final pair if and only if this parameter is true.
+ * @param onFound A function that is called for each key-value pair. This
+ * function can return {break:R} to stop early with result R.
+ * @param initialCounter Initial third argument of onFound. This value
+ * increases by one each time `onFound` is called. Default: 0
+ * @returns The number of values found, or R if the callback returned
+ * `{break:R}` to stop early.
+ * @description Computational complexity: O(number of items scanned + log
size)
+ */
+ forRange<R=number>(low: K, high: K, includeHigh: boolean, onFound?:
(k:K,v:V,counter:number) => {break?:R}|void, initialCounter?: number): R|number
{
+ var r = this._root.forRange(low, high, includeHigh, false, this,
initialCounter || 0, onFound);
+ return typeof r === "number" ? r : r.break!;
+ }
+
+ /**
+ * Scans and potentially modifies values for a subsequence of keys.
+ * Note: the callback `onFound` should ideally be a pure function.
+ * Specfically, it must not insert items, call clone(), or change
+ * the collection except via return value; out-of-band editing may
+ * cause an exception or may cause incorrect data to be sent to
+ * the callback (duplicate or missed items). It must not cause a
+ * clone() of the collection, otherwise the clone could be modified
+ * by changes requested by the callback.
+ * @param low The first key scanned will be greater than or equal to `low`.
+ * @param high Scanning stops when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present, `onFound` is called for
+ * that final pair if and only if this parameter is true.
+ * @param onFound A function that is called for each key-value pair. This
+ * function can return `{value:v}` to change the value associated
+ * with the current key, `{delete:true}` to delete the current pair,
+ * `{break:R}` to stop early with result R, or it can return nothing
+ * (undefined or {}) to cause no effect and continue iterating.
+ * `{break:R}` can be combined with one of the other two commands.
+ * The third argument `counter` is the number of items iterated
+ * previously; it equals 0 when `onFound` is called the first time.
+ * @returns The number of values scanned, or R if the callback returned
+ * `{break:R}` to stop early.
+ * @description
+ * Computational complexity: O(number of items scanned + log size)
+ * Note: if the tree has been cloned with clone(), any shared
+ * nodes are copied before `onFound` is called. This takes O(n) time
+ * where n is proportional to the amount of shared data scanned.
+ */
+ editRange<R=V>(low: K, high: K, includeHigh: boolean, onFound:
(k:K,v:V,counter:number) => EditRangeResult<V,R>|void, initialCounter?:
number): R|number {
+ var root = this._root;
+ if (root.isShared)
+ this._root = root = root.clone();
+ try {
+ var r = root.forRange(low, high, includeHigh, true, this, initialCounter
|| 0, onFound);
+ return typeof r === "number" ? r : r.break!;
+ } finally {
+ while (root.keys.length <= 1 && !root.isLeaf)
+ this._root = root = root.keys.length === 0 ? EmptyLeaf :
+ (root as any as BNodeInternal<K,V>).children[0];
+ }
+ }
+
+ /** Same as `editRange` except that the callback is called for all pairs. */
+ editAll<R=V>(onFound: (k:K,v:V,counter:number) => EditRangeResult<V,R>|void,
initialCounter?: number): R|number {
+ return this.editRange(this.minKey()!, this.maxKey()!, true, onFound,
initialCounter);
+ }
+
+ /**
+ * Removes a range of key-value pairs from the B+ tree.
+ * @param low The first key scanned will be greater than or equal to `low`.
+ * @param high Scanning stops when a key larger than this is reached.
+ * @param includeHigh Specifies whether the `high` key, if present, is
deleted.
+ * @returns The number of key-value pairs that were deleted.
+ * @description Computational complexity: O(log size + number of items
deleted)
+ */
+ deleteRange(low: K, high: K, includeHigh: boolean): number {
+ return this.editRange(low, high, includeHigh, DeleteRange);
+ }
+
+ /** Deletes a series of keys from the collection. */
+ deleteKeys(keys: K[]): number {
+ for (var i = 0, r = 0; i < keys.length; i++)
+ if (this.delete(keys[i]))
+ r++;
+ return r;
+ }
+
+ /** Gets the height of the tree: the number of internal nodes between the
+ * BTree object and its leaf nodes (zero if there are no internal nodes). */
+ get height(): number {
+ for (var node = this._root, h = -1; node != null; h++)
+ node = (node as any).children;
+ return h;
+ }
+
+ /** Makes the object read-only to ensure it is not accidentally modified.
+ * Freezing does not have to be permanent; unfreeze() reverses the effect.
+ * This is accomplished by replacing mutator functions with a function
+ * that throws an Error. Compared to using a property (e.g. this.isFrozen)
+ * this implementation gives better performance in non-frozen BTrees.
+ */
+ freeze() {
+ var t = this as any;
+ // Note: all other mutators ultimately call set() or editRange()
+ // so we don't need to override those others.
+ t.clear = t.set = t.editRange = function() {
+ throw new Error("Attempted to modify a frozen BTree");
+ };
+ }
+
+ /** Ensures mutations are allowed, reversing the effect of freeze(). */
+ unfreeze() {
+ delete this.clear;
+ delete this.set;
+ delete this.editRange;
+ }
+
+ /** Returns true if the tree appears to be frozen. */
+ get isFrozen() {
+ return this.hasOwnProperty('editRange');
+ }
+
+ /** Scans the tree for signs of serious bugs (e.g. this.size doesn't match
+ * number of elements, internal nodes not caching max element properly...)
+ * Computational complexity: O(number of nodes), i.e. O(size). This method
+ * skips the most expensive test - whether all keys are sorted - but it
+ * does check that maxKey() of the children of internal nodes are sorted. */
+ checkValid() {
+ var size = this._root.checkValid(0, this);
+ check(size === this.size, "size mismatch: counted ", size, "but stored",
this.size);
+ }
+}
+
+declare const Symbol: any;
+if (Symbol && Symbol.iterator) // iterator is equivalent to entries()
+ (BTree as any).prototype[Symbol.iterator] = BTree.prototype.entries;
+(BTree as any).prototype.where = BTree.prototype.filter;
+(BTree as any).prototype.setRange = BTree.prototype.setPairs;
+(BTree as any).prototype.add = BTree.prototype.set;
+
+function iterator<T>(next: () => {done:boolean,value?:T} = (() => ({
done:true, value:undefined }))): IterableIterator<T> {
+ var result: any = { next };
+ if (Symbol && Symbol.iterator)
+ result[Symbol.iterator] = function() { return this; };
+ return result;
+}
+
+
+/** Leaf node / base class. **************************************************/
+class BNode<K,V> {
+ // If this is an internal node, _keys[i] is the highest key in children[i].
+ keys: K[];
+ values: V[];
+ isShared: true | undefined;
+ get isLeaf() { return (this as any).children === undefined; }
+
+ constructor(keys: K[] = [], values?: V[]) {
+ this.keys = keys;
+ this.values = values || undefVals as any[];
+ this.isShared = undefined;
+ }
+
+ // Shared methods /////////////////////////////////////////////////////////
+
+ maxKey() {
+ return this.keys[this.keys.length-1];
+ }
+
+ // If key not found, returns i^failXor where i is the insertion index.
+ // Callers that don't care whether there was a match will set failXor=0.
+ indexOf(key: K, failXor: number, cmp: (a:K, b:K) => number): index {
+ // TODO: benchmark multiple search strategies
+ const keys = this.keys;
+ var lo = 0, hi = keys.length, mid = hi >> 1;
+ while(lo < hi) {
+ var c = cmp(keys[mid], key);
+ if (c < 0)
+ lo = mid + 1;
+ else if (c > 0) // key < keys[mid]
+ hi = mid;
+ else if (c === 0)
+ return mid;
+ else {
+ // c is NaN or otherwise invalid
+ if (key === key) // at least the search key is not NaN
+ return keys.length;
+ else
+ throw new Error("BTree: NaN was used as a key");
+ }
+ mid = (lo + hi) >> 1;
+ }
+ return mid ^ failXor;
+
+ // Unrolled version: benchmarks show same speed, not worth using
+ /*var i = 1, c: number = 0, sum = 0;
+ if (keys.length >= 4) {
+ i = 3;
+ if (keys.length >= 8) {
+ i = 7;
+ if (keys.length >= 16) {
+ i = 15;
+ if (keys.length >= 32) {
+ i = 31;
+ if (keys.length >= 64) {
+ i = 127;
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 64 :
-64;
+ sum += c;
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 32 :
-32;
+ sum += c;
+ }
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 16 : -16;
+ sum += c;
+ }
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 8 : -8;
+ sum += c;
+ }
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 4 : -4;
+ sum += c;
+ }
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 2 : -2;
+ sum += c;
+ }
+ i += (c = i < keys.length ? cmp(keys[i], key) : 1) < 0 ? 1 : -1;
+ c = i < keys.length ? cmp(keys[i], key) : 1;
+ sum += c;
+ if (c < 0) {
+ ++i;
+ c = i < keys.length ? cmp(keys[i], key) : 1;
+ sum += c;
+ }
+ if (sum !== sum) {
+ if (key === key) // at least the search key is not NaN
+ return keys.length ^ failXor;
+ else
+ throw new Error("BTree: NaN was used as a key");
+ }
+ return c === 0 ? i : i ^ failXor;*/
+ }
+
+ // Leaf Node: misc //////////////////////////////////////////////////////////
+
+ minKey() {
+ return this.keys[0];
+ }
+
+ clone(): BNode<K,V> {
+ var v = this.values;
+ return new BNode<K,V>(this.keys.slice(0), v === undefVals ? v :
v.slice(0));
+ }
+
+ greedyClone(force?: boolean): BNode<K,V> {
+ return this.isShared && !force ? this : this.clone();
+ }
+
+ get(key: K, defaultValue: V|undefined, tree: BTree<K,V>): V|undefined {
+ var i = this.indexOf(key, -1, tree._compare);
+ return i < 0 ? defaultValue : this.values[i];
+ }
+
+ checkValid(depth: number, tree: BTree<K,V>): number {
+ var kL = this.keys.length, vL = this.values.length;
+ check(this.values === undefVals ? kL <= vL : kL === vL,
+ "keys/values length mismatch: depth", depth, "with lengths", kL, vL);
+ // Note: we don't check for "node too small" because sometimes a node
+ // can legitimately have size 1. This occurs if there is a batch
+ // deletion, leaving a node of size 1, and the siblings are full so
+ // it can't be merged with adjacent nodes. However, the parent will
+ // verify that the average node size is at least half of the maximum.
+ check(depth == 0 || kL > 0, "empty leaf at depth", depth);
+ return kL;
+ }
+
+ // Leaf Node: set & node splitting //////////////////////////////////////////
+
+ set(key: K, value: V, overwrite: boolean|undefined, tree: BTree<K,V>):
boolean|BNode<K,V> {
+ var i = this.indexOf(key, -1, tree._compare);
+ if (i < 0) {
+ // key does not exist yet
+ i = ~i;
+ tree._size++;
+
+ if (this.keys.length < tree._maxNodeSize) {
+ return this.insertInLeaf(i, key, value, tree);
+ } else {
+ // This leaf node is full and must split
+ var newRightSibling = this.splitOffRightSide(), target: BNode<K,V> =
this;
+ if (i > this.keys.length) {
+ i -= this.keys.length;
+ target = newRightSibling;
+ }
+ target.insertInLeaf(i, key, value, tree);
+ return newRightSibling;
+ }
+ } else {
+ // Key already exists
+ if (overwrite !== false) {
+ if (value !== undefined)
+ this.reifyValues();
+ // usually this is a no-op, but some users may wish to edit the key
+ this.keys[i] = key;
+ this.values[i] = value;
+ }
+ return false;
+ }
+ }
+
+ reifyValues() {
+ if (this.values === undefVals)
+ return this.values = this.values.slice(0, this.keys.length);
+ return this.values;
+ }
+
+ insertInLeaf(i: index, key: K, value: V, tree: BTree<K,V>) {
+ this.keys.splice(i, 0, key);
+ if (this.values === undefVals) {
+ while (undefVals.length < tree._maxNodeSize)
+ undefVals.push(undefined);
+ if (value === undefined) {
+ return true;
+ } else {
+ this.values = undefVals.slice(0, this.keys.length - 1);
+ }
+ }
+ this.values.splice(i, 0, value);
+ return true;
+ }
+
+ takeFromRight(rhs: BNode<K,V>) {
+ // Reminder: parent node must update its copy of key for this node
+ // assert: neither node is shared
+ // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+ var v = this.values;
+ if (rhs.values === undefVals) {
+ if (v !== undefVals)
+ v.push(undefined as any);
+ } else {
+ v = this.reifyValues();
+ v.push(rhs.values.shift()!);
+ }
+ this.keys.push(rhs.keys.shift()!);
+ }
+
+ takeFromLeft(lhs: BNode<K,V>) {
+ // Reminder: parent node must update its copy of key for this node
+ // assert: neither node is shared
+ // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+ var v = this.values;
+ if (lhs.values === undefVals) {
+ if (v !== undefVals)
+ v.unshift(undefined as any);
+ } else {
+ v = this.reifyValues();
+ v.unshift(lhs.values.pop()!);
+ }
+ this.keys.unshift(lhs.keys.pop()!);
+ }
+
+ splitOffRightSide(): BNode<K,V> {
+ // Reminder: parent node must update its copy of key for this node
+ var half = this.keys.length >> 1, keys = this.keys.splice(half);
+ var values = this.values === undefVals ? undefVals :
this.values.splice(half);
+ return new BNode<K,V>(keys, values);
+ }
+
+ // Leaf Node: scanning & deletions //////////////////////////////////////////
+
+ forRange<R>(low: K, high: K, includeHigh: boolean|undefined, editMode:
boolean, tree: BTree<K,V>, count: number,
+ onFound?: (k:K, v:V, counter:number) =>
EditRangeResult<V,R>|void): EditRangeResult<V,R>|number {
+ var cmp = tree._compare;
+ var iLow, iHigh;
+ if (high === low) {
+ if (!includeHigh)
+ return count;
+ iHigh = (iLow = this.indexOf(low, -1, cmp)) + 1;
+ if (iLow < 0)
+ return count;
+ } else {
+ iLow = this.indexOf(low, 0, cmp);
+ iHigh = this.indexOf(high, -1, cmp);
+ if (iHigh < 0)
+ iHigh = ~iHigh;
+ else if (includeHigh === true)
+ iHigh++;
+ }
+ var keys = this.keys, values = this.values;
+ if (onFound !== undefined) {
+ for(var i = iLow; i < iHigh; i++) {
+ var key = keys[i];
+ var result = onFound(key, values[i], count++);
+ if (result !== undefined) {
+ if (editMode === true) {
+ if (key !== keys[i] || this.isShared === true)
+ throw new Error("BTree illegally changed or cloned in
editRange");
+ if (result.delete) {
+ this.keys.splice(i, 1);
+ if (this.values !== undefVals)
+ this.values.splice(i, 1);
+ tree._size--;
+ i--;
+ iHigh--;
+ } else if (result.hasOwnProperty('value')) {
+ values![i] = result.value!;
+ }
+ }
+ if (result.break !== undefined)
+ return result;
+ }
+ }
+ } else
+ count += iHigh - iLow;
+ return count;
+ }
+
+ /** Adds entire contents of right-hand sibling (rhs is left unchanged) */
+ mergeSibling(rhs: BNode<K,V>, _: number) {
+ this.keys.push.apply(this.keys, rhs.keys);
+ if (this.values === undefVals) {
+ if (rhs.values === undefVals)
+ return;
+ this.values = this.values.slice(0, this.keys.length);
+ }
+ this.values.push.apply(this.values, rhs.reifyValues());
+ }
+}
+
+/** Internal node (non-leaf node) ********************************************/
+class BNodeInternal<K,V> extends BNode<K,V> {
+ // Note: conventionally B+ trees have one fewer key than the number of
+ // children, but I find it easier to keep the array lengths equal: each
+ // keys[i] caches the value of children[i].maxKey().
+ children: BNode<K,V>[];
+
+ constructor(children: BNode<K,V>[], keys?: K[]) {
+ if (!keys) {
+ keys = [];
+ for (var i = 0; i < children.length; i++)
+ keys[i] = children[i].maxKey();
+ }
+ super(keys);
+ this.children = children;
+ }
+
+ clone(): BNode<K,V> {
+ var children = this.children.slice(0);
+ for (var i = 0; i < children.length; i++)
+ children[i].isShared = true;
+ return new BNodeInternal<K,V>(children, this.keys.slice(0));
+ }
+
+ greedyClone(force?: boolean): BNode<K,V> {
+ if (this.isShared && !force)
+ return this;
+ var nu = new BNodeInternal<K,V>(this.children.slice(0),
this.keys.slice(0));
+ for (var i = 0; i < nu.children.length; i++)
+ nu.children[i] = nu.children[i].greedyClone();
+ return nu;
+ }
+
+ minKey() {
+ return this.children[0].minKey();
+ }
+
+ get(key: K, defaultValue: V|undefined, tree: BTree<K,V>): V|undefined {
+ var i = this.indexOf(key, 0, tree._compare), children = this.children;
+ return i < children.length ? children[i].get(key, defaultValue, tree) :
undefined;
+ }
+
+ checkValid(depth: number, tree: BTree<K,V>) : number {
+ var kL = this.keys.length, cL = this.children.length;
+ check(kL === cL, "keys/children length mismatch: depth", depth, "lengths",
kL, cL);
+ check(kL > 1, "internal node has length", kL, "at depth", depth);
+ var size = 0, c = this.children, k = this.keys, childSize = 0;
+ for (var i = 0; i < cL; i++) {
+ size += c[i].checkValid(depth + 1, tree);
+ childSize += c[i].keys.length;
+ check(size >= childSize, "wtf"); // no way this will ever fail
+ check(i === 0 || c[i-1].constructor === c[i].constructor, "type
mismatch");
+ if (c[i].maxKey() != k[i])
+ check(false, "keys[", i, "] =", k[i], "is wrong, should be ",
c[i].maxKey(), "at depth", depth);
+ if (!(i === 0 || tree._compare(k[i-1], k[i]) < 0))
+ check(false, "sort violation at depth", depth, "index", i, "keys",
k[i-1], k[i]);
+ }
+ var toofew = childSize < (tree.maxNodeSize >> 1)*cL;
+ if (toofew || childSize > tree.maxNodeSize*cL)
+ check(false, toofew ? "too few" : "too many", "children (", childSize,
size, ") at depth", depth, ", maxNodeSize:", tree.maxNodeSize,
"children.length:", cL);
+ return size;
+ }
+
+ // Internal Node: set & node splitting //////////////////////////////////////
+
+ set(key: K, value: V, overwrite: boolean|undefined, tree: BTree<K,V>):
boolean|BNodeInternal<K,V> {
+ var c = this.children, max = tree._maxNodeSize, cmp = tree._compare;
+ var i = Math.min(this.indexOf(key, 0, cmp), c.length - 1), child = c[i];
+
+ if (child.isShared)
+ c[i] = child = child.clone();
+ if (child.keys.length >= max) {
+ // child is full; inserting anything else will cause a split.
+ // Shifting an item to the left or right sibling may avoid a split.
+ // We can do a shift if the adjacent node is not full and if the
+ // current key can still be placed in the same node after the shift.
+ var other: BNode<K,V>;
+ if (i > 0 && (other = c[i-1]).keys.length < max && cmp(child.keys[0],
key) < 0) {
+ if (other.isShared)
+ c[i-1] = other = other.clone();
+ other.takeFromRight(child);
+ this.keys[i-1] = other.maxKey();
+ } else if ((other = c[i+1]) !== undefined && other.keys.length < max &&
cmp(child.maxKey(), key) < 0) {
+ if (other.isShared)
+ c[i+1] = other = other.clone();
+ other.takeFromLeft(child);
+ this.keys[i] = c[i].maxKey();
+ }
+ }
+
+ var result = child.set(key, value, overwrite, tree);
+ if (result === false)
+ return false;
+ this.keys[i] = child.maxKey();
+ if (result === true)
+ return true;
+
+ // The child has split and `result` is a new right child... does it fit?
+ if (this.keys.length < max) { // yes
+ this.insert(i+1, result);
+ return true;
+ } else { // no, we must split also
+ var newRightSibling = this.splitOffRightSide(), target:
BNodeInternal<K,V> = this;
+ if (cmp(result.maxKey(), this.maxKey()) > 0) {
+ target = newRightSibling;
+ i -= this.keys.length;
+ }
+ target.insert(i+1, result);
+ return newRightSibling;
+ }
+ }
+
+ insert(i: index, child: BNode<K,V>) {
+ this.children.splice(i, 0, child);
+ this.keys.splice(i, 0, child.maxKey());
+ }
+
+ splitOffRightSide() {
+ var half = this.children.length >> 1;
+ return new BNodeInternal<K,V>(this.children.splice(half),
this.keys.splice(half));
+ }
+
+ takeFromRight(rhs: BNode<K,V>) {
+ // Reminder: parent node must update its copy of key for this node
+ // assert: neither node is shared
+ // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+ this.keys.push(rhs.keys.shift()!);
+ this.children.push((rhs as BNodeInternal<K,V>).children.shift()!);
+ }
+
+ takeFromLeft(lhs: BNode<K,V>) {
+ // Reminder: parent node must update its copy of key for this node
+ // assert: neither node is shared
+ // assert rhs.keys.length > (maxNodeSize/2 && this.keys.length<maxNodeSize)
+ this.keys.unshift(lhs.keys.pop()!);
+ this.children.unshift((lhs as BNodeInternal<K,V>).children.pop()!);
+ }
+
+ // Internal Node: scanning & deletions //////////////////////////////////////
+
+ forRange<R>(low: K, high: K, includeHigh: boolean|undefined, editMode:
boolean, tree: BTree<K,V>, count: number,
+ onFound?: (k:K, v:V, counter:number) => EditRangeResult<V,R>|void):
EditRangeResult<V,R>|number
+ {
+ var cmp = tree._compare;
+ var iLow = this.indexOf(low, 0, cmp), i = iLow;
+ var iHigh = Math.min(high === low ? iLow : this.indexOf(high, 0, cmp),
this.keys.length-1);
+ var keys = this.keys, children = this.children;
+ if (!editMode) {
+ // Simple case
+ for(; i <= iHigh; i++) {
+ var result = children[i].forRange(low, high, includeHigh, editMode,
tree, count, onFound);
+ if (typeof result !== 'number')
+ return result;
+ count = result;
+ }
+ } else if (i <= iHigh) {
+ try {
+ for(; i <= iHigh; i++) {
+ if (children[i].isShared)
+ children[i] = children[i].clone();
+ var result = children[i].forRange(low, high, includeHigh, editMode,
tree, count, onFound);
+ keys[i] = children[i].maxKey();
+ if (typeof result !== 'number')
+ return result;
+ count = result;
+ }
+ } finally {
+ // Deletions may have occurred, so look for opportunities to merge
nodes.
+ var half = tree._maxNodeSize >> 1;
+ if (iLow > 0)
+ iLow--;
+ for(i = iHigh; i >= iLow; i--) {
+ if (children[i].keys.length <= half)
+ this.tryMerge(i, tree._maxNodeSize);
+ }
+ // Are we completely empty?
+ if (children[0].keys.length === 0) {
+ check(children.length === 1 && keys.length === 1, "emptiness bug");
+ children.shift();
+ keys.shift();
+ }
+ }
+ }
+ return count;
+ }
+
+ /** Merges child i with child i+1 if their combined size is not too large */
+ tryMerge(i: index, maxSize: number): boolean {
+ var children = this.children;
+ if (i >= 0 && i + 1 < children.length) {
+ if (children[i].keys.length + children[i+1].keys.length <= maxSize) {
+ if (children[i].isShared) // cloned already UNLESS i is outside scan
range
+ children[i] = children[i].clone();
+ children[i].mergeSibling(children[i+1], maxSize);
+ children.splice(i + 1, 1);
+ this.keys.splice(i + 1, 1);
+ this.keys[i] = children[i].maxKey();
+ return true;
+ }
+ }
+ return false;
+ }
+
+ mergeSibling(rhs: BNode<K,V>, maxNodeSize: number) {
+ // assert !this.isShared;
+ var oldLength = this.keys.length;
+ this.keys.push.apply(this.keys, rhs.keys);
+ this.children.push.apply(this.children, (rhs as any as
BNodeInternal<K,V>).children);
+ // If our children are themselves almost empty due to a mass-delete,
+ // they may need to be merged too (but only the oldLength-1 and its
+ // right sibling should need this).
+ this.tryMerge(oldLength-1, maxNodeSize);
+ }
+}
+
+// Optimization: this array of `undefined`s is used instead of a normal
+// array of values in nodes where `undefined` is the only value.
+// Its length is extended to max node size on first use; since it can
+// be shared between trees with different maximums, its length can only
+// increase, never decrease. Its type should be undefined[] but strangely
+// TypeScript won't allow the comparison V[] === undefined[]. To prevent
+// users from making this array too large, BTree has a maximum node size.
+var undefVals: any[] = [];
+
+const Delete = {delete: true}, DeleteRange = () => Delete;
+const Break = {break: true};
+const EmptyLeaf = (function() {
+ var n = new BNode<any,any>(); n.isShared = true; return n;
+})();
+const EmptyArray: any[] = [];
+const ReusedArray: any[] = []; // assumed thread-local
+
+function check(fact: boolean, ...args: any[]) {
+ if (!fact) {
+ args.unshift('B+ tree '); // at beginning of message
+ throw new Error(args.join(' '));
+ }
+}
+
+/** A BTree frozen in the empty state. */
+export const EmptyBTree = (() => { let t = new BTree(); t.freeze(); return t;
})();
\ No newline at end of file
diff --git a/packages/idb-bridge/src/tree/interfaces.ts
b/packages/idb-bridge/src/tree/interfaces.ts
new file mode 100644
index 00000000..c708c20b
--- /dev/null
+++ b/packages/idb-bridge/src/tree/interfaces.ts
@@ -0,0 +1,329 @@
+/*
+Copyright (c) 2018 David Piepgrass
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+SPDX-License-Identifier: MIT
+*/
+
+// Original repository: https://github.com/qwertie/btree-typescript
+
+
+/** Read-only set interface (subinterface of IMapSource<K,any>).
+ * The word "set" usually means that each item in the collection is unique
+ * (appears only once, based on a definition of equality used by the
+ * collection.) Objects conforming to this interface aren't guaranteed not
+ * to contain duplicates, but as an example, BTree<K,V> implements this
+ * interface and does not allow duplicates. */
+export interface ISetSource<K=any>
+{
+ /** Returns the number of key/value pairs in the map object. */
+ size: number;
+ /** Returns a boolean asserting whether the key exists in the map object or
not. */
+ has(key: K): boolean;
+ /** Returns a new iterator for iterating the items in the set (the order is
implementation-dependent). */
+ keys(): IterableIterator<K>;
+}
+
+/** Read-only map interface (i.e. a source of key-value pairs). */
+export interface IMapSource<K=any, V=any> extends ISetSource<K>
+{
+ /** Returns the number of key/value pairs in the map object. */
+ size: number;
+ /** Returns the value associated to the key, or undefined if there is none.
*/
+ get(key: K): V|undefined;
+ /** Returns a boolean asserting whether the key exists in the map object or
not. */
+ has(key: K): boolean;
+ /** Calls callbackFn once for each key-value pair present in the map object.
+ * The ES6 Map class sends the value to the callback before the key, so
+ * this interface must do likewise. */
+ forEach(callbackFn: (v:V, k:K, map:IMapSource<K,V>) => void, thisArg: any):
void;
+
+ /** Returns an iterator that provides all key-value pairs from the
collection (as arrays of length 2). */
+ entries(): IterableIterator<[K,V]>;
+ /** Returns a new iterator for iterating the keys of each pair. */
+ keys(): IterableIterator<K>;
+ /** Returns a new iterator for iterating the values of each pair. */
+ values(): IterableIterator<V>;
+ // TypeScript compiler decided Symbol.iterator has type 'any'
+ //[Symbol.iterator](): IterableIterator<[K,V]>;
+}
+
+/** Write-only set interface (the set cannot be queried, but items can be
added to it.)
+ * @description Note: BTree<K,V> does not officially implement this interface,
+ * but BTree<K> can be used as an instance of ISetSink<K>. */
+export interface ISetSink<K=any>
+{
+ /** Adds the specified item to the set, if it was not in the set already. */
+ add(key: K): any;
+ /** Returns true if an element in the map object existed and has been
+ * removed, or false if the element did not exist. */
+ delete(key: K): boolean;
+ /** Removes everything so that the set is empty. */
+ clear(): void;
+}
+
+/** Write-only map interface (i.e. a drain into which key-value pairs can be
"sunk") */
+export interface IMapSink<K=any, V=any>
+{
+ /** Returns true if an element in the map object existed and has been
+ * removed, or false if the element did not exist. */
+ delete(key: K): boolean;
+ /** Sets the value for the key in the map object (the return value is
+ * boolean in BTree but Map returns the Map itself.) */
+ set(key: K, value: V): any;
+ /** Removes all key/value pairs from the IMap object. */
+ clear(): void;
+}
+
+/** Set interface.
+ * @description Note: BTree<K,V> does not officially implement this interface,
+ * but BTree<K> can be used as an instance of ISet<K>. */
+export interface ISet<K=any> extends ISetSource<K>, ISetSink<K> { }
+
+/** An interface compatible with ES6 Map and BTree. This interface does not
+ * describe the complete interface of either class, but merely the common
+ * interface shared by both. */
+export interface IMap<K=any, V=any> extends IMapSource<K, V>, IMapSink<K, V> {
}
+
+/** An data source that provides read-only access to a set of items called
+ * "keys" in sorted order. This is a subinterface of ISortedMapSource. */
+export interface ISortedSetSource<K=any> extends ISetSource<K>
+{
+ /** Gets the lowest key in the collection. */
+ minKey(): K | undefined;
+ /** Gets the highest key in the collection. */
+ maxKey(): K | undefined;
+ /** Returns the next key larger than the specified key (or undefined if
there is none) */
+ nextHigherKey(key: K): K|undefined;
+ /** Returns the next key smaller than the specified key (or undefined if
there is none) */
+ nextLowerKey(key: K): K|undefined;
+ /** Calls `callback` on the specified range of keys, in ascending order by
key.
+ * @param low The first key scanned will be greater than or equal to `low`.
+ * @param high Scanning stops when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present in the map, `onFound` is
called
+ * for that final pair if and only if this parameter is true.
+ * @param onFound A function that is called for each key pair. Because this
+ * is a subinterface of ISortedMapSource, if there is a value
+ * associated with the key, it is passed as the second parameter.
+ * @param initialCounter Initial third argument of `onFound`. This value
+ * increases by one each time `onFound` is called. Default: 0
+ * @returns Number of pairs found and the number of times `onFound` was
called.
+ */
+ forRange(low: K, high: K, includeHigh: boolean, onFound?:
(k:K,v:any,counter:number) => void, initialCounter?: number): number;
+ /** Returns a new iterator for iterating the keys of each pair in ascending
order.
+ * @param firstKey: Minimum key to include in the output. */
+ keys(firstKey?: K): IterableIterator<K>;
+}
+
+/** An data source that provides read-only access to items in sorted order. */
+export interface ISortedMapSource<K=any, V=any> extends IMapSource<K, V>,
ISortedSetSource<K>
+{
+ /** Returns the next pair whose key is larger than the specified key (or
undefined if there is none) */
+ nextHigherPair(key: K): [K,V]|undefined;
+ /** Returns the next pair whose key is smaller than the specified key (or
undefined if there is none) */
+ nextLowerPair(key: K): [K,V]|undefined;
+ /** Builds an array of pairs from the specified range of keys, sorted by key.
+ * Each returned pair is also an array: pair[0] is the key, pair[1] is the
value.
+ * @param low The first key in the array will be greater than or equal to
`low`.
+ * @param high This method returns when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present in the map, its pair will
be
+ * included in the output if and only if this parameter is true.
Note:
+ * if the `low` key is present, it is always included in the output.
+ * @param maxLength Maximum length of the returned array (default: unlimited)
+ * @description Computational complexity: O(result.length + log size)
+ */
+ getRange(low: K, high: K, includeHigh?: boolean, maxLength?: number):
[K,V][];
+ /** Calls `callback` on the specified range of keys, in ascending order by
key.
+ * @param low The first key scanned will be greater than or equal to `low`.
+ * @param high Scanning stops when a key larger than this is reached.
+ * @param includeHigh If the `high` key is present in the map, `onFound` is
called
+ * for that final pair if and only if this parameter is true.
+ * @param onFound A function that is called for each key-value pair.
+ * @param initialCounter Initial third argument of onFound. This value
+ * increases by one each time `onFound` is called. Default: 0
+ * @returns Number of pairs found and the number of times `callback` was
called.
+ */
+ forRange(low: K, high: K, includeHigh: boolean, onFound?:
(k:K,v:V,counter:number) => void, initialCounter?: number): number;
+ /** Returns an iterator that provides items in order by key.
+ * @param firstKey: Minimum key to include in the output. */
+ entries(firstKey?: K): IterableIterator<[K,V]>;
+ /** Returns a new iterator for iterating the keys of each pair in ascending
order.
+ * @param firstKey: Minimum key to include in the output. */
+ keys(firstKey?: K): IterableIterator<K>;
+ /** Returns a new iterator for iterating the values of each pair in order by
key.
+ * @param firstKey: Minimum key whose associated value is included in the
output. */
+ values(firstKey?: K): IterableIterator<V>;
+
+ // This method should logically be in IMapSource but is not supported by ES6
Map
+ /** Performs a reduce operation like the `reduce` method of `Array`.
+ * It is used to combine all pairs into a single value, or perform
conversions. */
+ reduce<R>(callback:
(previous:R,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R,
initialValue: R): R;
+ /** Performs a reduce operation like the `reduce` method of `Array`.
+ * It is used to combine all pairs into a single value, or perform
conversions. */
+ reduce<R>(callback:
(previous:R|undefined,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R):
R|undefined;
+}
+
+/** An interface for a set of keys (the combination of ISortedSetSource<K> and
ISetSink<K>) */
+export interface ISortedSet<K=any> extends ISortedSetSource<K>, ISetSink<K> { }
+
+/** An interface for a sorted map (dictionary),
+ * not including functional/persistent methods. */
+export interface ISortedMap<K=any, V=any> extends IMap<K,V>,
ISortedMapSource<K, V>
+{
+ // All of the following methods should be in IMap but are left out of IMap
+ // so that IMap is compatible with ES6 Map.
+
+ /** Adds or overwrites a key-value pair in the sorted map.
+ * @param key the key is used to determine the sort order of data in the
tree.
+ * @param value data to associate with the key
+ * @param overwrite Whether to overwrite an existing key-value pair
+ * (default: true). If this is false and there is an existing
+ * key-value pair then the call to this method has no effect.
+ * @returns true if a new key-value pair was added, false if the key
+ * already existed. */
+ set(key: K, value: V, overwrite?: boolean): boolean;
+ /** Adds all pairs from a list of key-value pairs.
+ * @param pairs Pairs to add to this tree. If there are duplicate keys,
+ * later pairs currently overwrite earlier ones (e.g. [[0,1],[0,7]]
+ * associates 0 with 7.)
+ * @param overwrite Whether to overwrite pairs that already exist (if false,
+ * pairs[i] is ignored when the key pairs[i][0] already exists.)
+ * @returns The number of pairs added to the collection.
+ */
+ setPairs(pairs: [K,V][], overwrite?: boolean): number;
+ /** Deletes a series of keys from the collection. */
+ deleteKeys(keys: K[]): number;
+ /** Removes a range of key-value pairs from the B+ tree.
+ * @param low The first key deleted will be greater than or equal to `low`.
+ * @param high Deleting stops when a key larger than this is reached.
+ * @param includeHigh Specifies whether the `high` key, if present, is
deleted.
+ * @returns The number of key-value pairs that were deleted. */
+ deleteRange(low: K, high: K, includeHigh: boolean): number;
+
+ // TypeScript requires these methods of ISortedMapSource to be repeated
+ entries(firstKey?: K): IterableIterator<[K,V]>;
+ keys(firstKey?: K): IterableIterator<K>;
+ values(firstKey?: K): IterableIterator<V>;
+}
+
+/** An interface for a functional set, in which the set object could be
read-only
+ * but new versions of the set can be created by calling "with" or "without"
+ * methods to add or remove keys. This is a subinterface of IMapF<K,V>,
+ * so the items in the set may be referred to as "keys". */
+export interface ISetF<K=any> extends ISetSource<K> {
+ /** Returns a copy of the set with the specified key included.
+ * @description You might wonder why this method accepts only one key
+ * instead of `...keys: K[]`. The reason is that the derived interface
+ * IMapF expects the second parameter to be a value. Therefore
+ * withKeys() is provided to set multiple keys at once. */
+ with(key: K): ISetF<K>;
+ /** Returns a copy of the set with the specified key removed. */
+ without(key: K): ISetF<K>;
+ /** Returns a copy of the tree with all the keys in the specified array
present.
+ * @param keys The keys to add.
+ * @param returnThisIfUnchanged If true, the method returns `this` when
+ * all of the keys are already present in the collection. The
+ * default value may be true or false depending on the concrete
+ * implementation of the interface (in BTree, the default is false.)
*/
+ withKeys(keys: K[], returnThisIfUnchanged?: boolean): ISetF<K>;
+ /** Returns a copy of the tree with all the keys in the specified array
removed. */
+ withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): ISetF<K>;
+ /** Returns a copy of the tree with items removed whenever the callback
+ * function returns false.
+ * @param callback A function to call for each item in the set.
+ * The second parameter to `callback` exists because ISetF
+ * is a subinterface of IMapF. If the object is a map, v
+ * is the value associated with the key, otherwise v could be
+ * undefined or another copy of the third parameter (counter). */
+ filter(callback: (k:K,v:any,counter:number) => boolean,
returnThisIfUnchanged?: boolean): ISetF<K>;
+}
+
+/** An interface for a functional map, in which the map object could be
read-only
+ * but new versions of the map can be created by calling "with" or "without"
+ * methods to add or remove keys or key-value pairs.
+ */
+export interface IMapF<K=any, V=any> extends IMapSource<K, V>, ISetF<K> {
+ /** Returns a copy of the tree with the specified key set (the value is
undefined). */
+ with(key: K): IMapF<K,V|undefined>;
+ /** Returns a copy of the tree with the specified key-value pair set. */
+ with<V2>(key: K, value: V2, overwrite?: boolean): IMapF<K,V|V2>;
+ /** Returns a copy of the tree with the specified key-value pairs set. */
+ withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): IMapF<K,V|V2>;
+ /** Returns a copy of the tree with all the keys in the specified array
present.
+ * @param keys The keys to add. If a key is already present in the tree,
+ * neither the existing key nor the existing value is modified.
+ * @param returnThisIfUnchanged If true, the method returns `this` when
+ * all of the keys are already present in the collection. The
+ * default value may be true or false depending on the concrete
+ * implementation of the interface (in BTree, the default is false.)
*/
+ withKeys(keys: K[], returnThisIfUnchanged?: boolean): IMapF<K,V|undefined>;
+ /** Returns a copy of the tree with all values altered by a callback
function. */
+ mapValues<R>(callback: (v:V,k:K,counter:number) => R): IMapF<K,R>;
+ /** Performs a reduce operation like the `reduce` method of `Array`.
+ * It is used to combine all pairs into a single value, or perform
conversions. */
+ reduce<R>(callback:
(previous:R,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R,
initialValue: R): R;
+ /** Performs a reduce operation like the `reduce` method of `Array`.
+ * It is used to combine all pairs into a single value, or perform
conversions. */
+ reduce<R>(callback:
(previous:R|undefined,currentPair:[K,V],counter:number,tree:IMapF<K,V>) => R):
R|undefined;
+
+ // Update return types in ISetF
+ without(key: K): IMapF<K,V>;
+ withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): IMapF<K,V>;
+ /** Returns a copy of the tree with pairs removed whenever the callback
+ * function returns false. */
+ filter(callback: (k:K,v:V,counter:number) => boolean,
returnThisIfUnchanged?: boolean): IMapF<K,V>;
+}
+
+/** An interface for a functional sorted set: a functional set in which the
+ * keys (items) are sorted. This is a subinterface of ISortedMapF. */
+export interface ISortedSetF<K=any> extends ISetF<K>, ISortedSetSource<K>
+{
+ // TypeScript requires this method of ISortedSetSource to be repeated
+ keys(firstKey?: K): IterableIterator<K>;
+}
+
+export interface ISortedMapF<K=any,V=any> extends ISortedSetF<K>, IMapF<K,V>,
ISortedMapSource<K,V>
+{
+ /** Returns a copy of the tree with the specified range of keys removed. */
+ withoutRange(low: K, high: K, includeHigh: boolean, returnThisIfUnchanged?:
boolean): ISortedMapF<K,V>;
+
+ // TypeScript requires these methods of ISortedSetF and ISortedMapSource to
be repeated
+ entries(firstKey?: K): IterableIterator<[K,V]>;
+ keys(firstKey?: K): IterableIterator<K>;
+ values(firstKey?: K): IterableIterator<V>;
+ forRange(low: K, high: K, includeHigh: boolean, onFound?:
(k:K,v:V,counter:number) => void, initialCounter?: number): number;
+
+ // Update the return value of methods from base interfaces
+ with(key: K): ISortedMapF<K,V|undefined>;
+ with<V2>(key: K, value: V2, overwrite?: boolean): ISortedMapF<K,V|V2>;
+ withKeys(keys: K[], returnThisIfUnchanged?: boolean):
ISortedMapF<K,V|undefined>;
+ withPairs<V2>(pairs: [K,V|V2][], overwrite: boolean): ISortedMapF<K,V|V2>;
+ mapValues<R>(callback: (v:V,k:K,counter:number) => R): ISortedMapF<K,R>;
+ without(key: K): ISortedMapF<K,V>;
+ withoutKeys(keys: K[], returnThisIfUnchanged?: boolean): ISortedMapF<K,V>;
+ filter(callback: (k:K,v:any,counter:number) => boolean,
returnThisIfUnchanged?: boolean): ISortedMapF<K,V>;
+}
+
+export interface ISortedMapConstructor<K,V> {
+ new (entries?: [K,V][], compare?: (a: K, b: K) => number): ISortedMap<K,V>;
+}
+export interface ISortedMapFConstructor<K,V> {
+ new (entries?: [K,V][], compare?: (a: K, b: K) => number):
ISortedMapF<K,V>;
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/FakeEvent.ts
b/packages/idb-bridge/src/util/FakeEvent.ts
new file mode 100644
index 00000000..bf17f7e7
--- /dev/null
+++ b/packages/idb-bridge/src/util/FakeEvent.ts
@@ -0,0 +1,80 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+
+import FakeEventTarget from "./FakeEventTarget";
+import { EventType } from "./types";
+
+class Event {
+ public eventPath: FakeEventTarget[] = [];
+ public type: EventType;
+
+ public readonly NONE = 0;
+ public readonly CAPTURING_PHASE = 1;
+ public readonly AT_TARGET = 2;
+ public readonly BUBBLING_PHASE = 3;
+
+ // Flags
+ public propagationStopped = false;
+ public immediatePropagationStopped = false;
+ public canceled = false;
+ public initialized = true;
+ public dispatched = false;
+
+ public target: FakeEventTarget | null = null;
+ public currentTarget: FakeEventTarget | null = null;
+
+ public eventPhase: 0 | 1 | 2 | 3 = 0;
+
+ public defaultPrevented = false;
+
+ public isTrusted = false;
+ public timeStamp = Date.now();
+
+ public bubbles: boolean;
+ public cancelable: boolean;
+
+ constructor(
+ type: EventType,
+ eventInitDict: { bubbles?: boolean; cancelable?: boolean } = {},
+ ) {
+ this.type = type;
+
+ this.bubbles =
+ eventInitDict.bubbles !== undefined ? eventInitDict.bubbles :
false;
+ this.cancelable =
+ eventInitDict.cancelable !== undefined
+ ? eventInitDict.cancelable
+ : false;
+ }
+
+ public preventDefault() {
+ if (this.cancelable) {
+ this.canceled = true;
+ }
+ }
+
+ public stopPropagation() {
+ this.propagationStopped = true;
+ }
+
+ public stopImmediatePropagation() {
+ this.propagationStopped = true;
+ this.immediatePropagationStopped = true;
+ }
+}
+
+export default Event;
diff --git a/packages/idb-bridge/src/util/FakeEventTarget.ts
b/packages/idb-bridge/src/util/FakeEventTarget.ts
new file mode 100644
index 00000000..3c7eaf46
--- /dev/null
+++ b/packages/idb-bridge/src/util/FakeEventTarget.ts
@@ -0,0 +1,177 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+import { InvalidStateError } from "./errors";
+import FakeEvent from "./FakeEvent";
+import { EventCallback, EventType } from "./types";
+
+type EventTypeProp =
+ | "onabort"
+ | "onblocked"
+ | "oncomplete"
+ | "onerror"
+ | "onsuccess"
+ | "onupgradeneeded"
+ | "onversionchange";
+
+interface Listener {
+ callback: EventCallback;
+ capture: boolean;
+ type: EventType;
+}
+
+const stopped = (event: FakeEvent, listener: Listener) => {
+ return (
+ event.immediatePropagationStopped ||
+ (event.eventPhase === event.CAPTURING_PHASE &&
+ listener.capture === false) ||
+ (event.eventPhase === event.BUBBLING_PHASE && listener.capture ===
true)
+ );
+};
+
+// http://www.w3.org/TR/dom/#concept-event-listener-invoke
+const invokeEventListeners = (event: FakeEvent, obj: FakeEventTarget) => {
+ event.currentTarget = obj;
+
+ // The callback might cause obj.listeners to mutate as we traverse it.
+ // Take a copy of the array so that nothing sneaks in and we don't lose
+ // our place.
+ for (const listener of obj.listeners.slice()) {
+ if (event.type !== listener.type || stopped(event, listener)) {
+ continue;
+ }
+
+ // @ts-ignore
+ listener.callback.call(event.currentTarget, event);
+ }
+
+ const typeToProp: { [key in EventType]: EventTypeProp } = {
+ abort: "onabort",
+ blocked: "onblocked",
+ complete: "oncomplete",
+ error: "onerror",
+ success: "onsuccess",
+ upgradeneeded: "onupgradeneeded",
+ versionchange: "onversionchange",
+ };
+ const prop = typeToProp[event.type];
+ if (prop === undefined) {
+ throw new Error(`Unknown event type: "${event.type}"`);
+ }
+
+ const callback = event.currentTarget[prop];
+ if (callback) {
+ const listener = {
+ callback,
+ capture: false,
+ type: event.type,
+ };
+ if (!stopped(event, listener)) {
+ // @ts-ignore
+ listener.callback.call(event.currentTarget, event);
+ }
+ }
+};
+
+abstract class FakeEventTarget {
+ public readonly listeners: Listener[] = [];
+
+ // These will be overridden in individual subclasses and made not readonly
+ public readonly onabort: EventCallback | null | undefined;
+ public readonly onblocked: EventCallback | null | undefined;
+ public readonly oncomplete: EventCallback | null | undefined;
+ public readonly onerror: EventCallback | null | undefined;
+ public readonly onsuccess: EventCallback | null | undefined;
+ public readonly onupgradeneeded: EventCallback | null | undefined;
+ public readonly onversionchange: EventCallback | null | undefined;
+
+ public addEventListener(
+ type: EventType,
+ callback: EventCallback,
+ capture = false,
+ ) {
+ this.listeners.push({
+ callback,
+ capture,
+ type,
+ });
+ }
+
+ public removeEventListener(
+ type: EventType,
+ callback: EventCallback,
+ capture = false,
+ ) {
+ const i = this.listeners.findIndex(listener => {
+ return (
+ listener.type === type &&
+ listener.callback === callback &&
+ listener.capture === capture
+ );
+ });
+
+ this.listeners.splice(i, 1);
+ }
+
+ // http://www.w3.org/TR/dom/#dispatching-events
+ public dispatchEvent(event: FakeEvent) {
+ if (event.dispatched || !event.initialized) {
+ throw new InvalidStateError("The object is in an invalid state.");
+ }
+ event.isTrusted = false;
+
+ event.dispatched = true;
+ event.target = this;
+ // NOT SURE WHEN THIS SHOULD BE SET event.eventPath = [];
+
+ event.eventPhase = event.CAPTURING_PHASE;
+ for (const obj of event.eventPath) {
+ if (!event.propagationStopped) {
+ invokeEventListeners(event, obj);
+ }
+ }
+
+ event.eventPhase = event.AT_TARGET;
+ if (!event.propagationStopped) {
+ invokeEventListeners(event, event.target);
+ }
+
+ if (event.bubbles) {
+ event.eventPath.reverse();
+ event.eventPhase = event.BUBBLING_PHASE;
+ if (event.eventPath.length === 0 && event.type === "error") {
+ console.error("Unhandled error event: ", event.target);
+ }
+ for (const obj of event.eventPath) {
+ if (!event.propagationStopped) {
+ invokeEventListeners(event, obj);
+ }
+ }
+ }
+
+ event.dispatched = false;
+ event.eventPhase = event.NONE;
+ event.currentTarget = null;
+
+ if (event.canceled) {
+ return false;
+ }
+ return true;
+ }
+}
+
+export default FakeEventTarget;
diff --git a/packages/idb-bridge/src/util/canInjectKey.ts
b/packages/idb-bridge/src/util/canInjectKey.ts
new file mode 100644
index 00000000..c6c9c24a
--- /dev/null
+++ b/packages/idb-bridge/src/util/canInjectKey.ts
@@ -0,0 +1,34 @@
+import { KeyPath, Value } from "./types";
+
+//
http://w3c.github.io/IndexedDB/#check-that-a-key-could-be-injected-into-a-value
+const canInjectKey = (keyPath: KeyPath, value: Value) => {
+ if (Array.isArray(keyPath)) {
+ // tslint:disable-next-line max-line-length
+ throw new Error(
+ "The key paths used in this section are always strings and never
sequences, since it is not possible to create a object store which has a key
generator and also has a key path that is a sequence.",
+ );
+ }
+
+ const identifiers = keyPath.split(".");
+ if (identifiers.length === 0) {
+ throw new Error("Assert: identifiers is not empty");
+ }
+ identifiers.pop();
+
+ for (const identifier of identifiers) {
+ if (typeof value !== "object" && !Array.isArray(value)) {
+ return false;
+ }
+
+ const hop = value.hasOwnProperty(identifier);
+ if (!hop) {
+ return true;
+ }
+
+ value = value[identifier];
+ }
+
+ return typeof value === "object" || Array.isArray(value);
+};
+
+export default canInjectKey;
diff --git a/packages/idb-bridge/src/util/cmp.ts
b/packages/idb-bridge/src/util/cmp.ts
new file mode 100644
index 00000000..9d0dc99a
--- /dev/null
+++ b/packages/idb-bridge/src/util/cmp.ts
@@ -0,0 +1,108 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+import { DataError } from "./errors";
+import valueToKey from "./valueToKey";
+
+const getType = (x: any) => {
+ if (typeof x === "number") {
+ return "Number";
+ }
+ if (x instanceof Date) {
+ return "Date";
+ }
+ if (Array.isArray(x)) {
+ return "Array";
+ }
+ if (typeof x === "string") {
+ return "String";
+ }
+ if (x instanceof ArrayBuffer) {
+ return "Binary";
+ }
+
+ throw new DataError();
+};
+
+// https://w3c.github.io/IndexedDB/#compare-two-keys
+const compareKeys = (first: any, second: any): -1 | 0 | 1 => {
+ if (second === undefined) {
+ throw new TypeError();
+ }
+
+ first = valueToKey(first);
+ second = valueToKey(second);
+
+ const t1 = getType(first);
+ const t2 = getType(second);
+
+ if (t1 !== t2) {
+ if (t1 === "Array") {
+ return 1;
+ }
+ if (
+ t1 === "Binary" &&
+ (t2 === "String" || t2 === "Date" || t2 === "Number")
+ ) {
+ return 1;
+ }
+ if (t1 === "String" && (t2 === "Date" || t2 === "Number")) {
+ return 1;
+ }
+ if (t1 === "Date" && t2 === "Number") {
+ return 1;
+ }
+ return -1;
+ }
+
+ if (t1 === "Binary") {
+ first = new Uint8Array(first);
+ second = new Uint8Array(second);
+ }
+
+ if (t1 === "Array" || t1 === "Binary") {
+ const length = Math.min(first.length, second.length);
+ for (let i = 0; i < length; i++) {
+ const result = compareKeys(first[i], second[i]);
+
+ if (result !== 0) {
+ return result;
+ }
+ }
+
+ if (first.length > second.length) {
+ return 1;
+ }
+ if (first.length < second.length) {
+ return -1;
+ }
+ return 0;
+ }
+
+ if (t1 === "Date") {
+ if (first.getTime() === second.getTime()) {
+ return 0;
+ }
+ } else {
+ if (first === second) {
+ return 0;
+ }
+ }
+
+ return first > second ? 1 : -1;
+};
+
+export default compareKeys;
diff --git a/packages/idb-bridge/src/util/deepEquals.ts
b/packages/idb-bridge/src/util/deepEquals.ts
new file mode 100644
index 00000000..8d05ad21
--- /dev/null
+++ b/packages/idb-bridge/src/util/deepEquals.ts
@@ -0,0 +1,75 @@
+/*
+Copyright (c) 2017 Evgeny Poberezkin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+
+
+
+const isArray = Array.isArray;
+const keyList = Object.keys;
+const hasProp = Object.prototype.hasOwnProperty;
+
+function deepEquals(a: any, b: any): boolean {
+ if (a === b) return true;
+
+ if (a && b && typeof a == "object" && typeof b == "object") {
+ const arrA = isArray(a);
+ const arrB = isArray(b);
+ let i;
+ let length;
+ let key;
+
+ if (arrA && arrB) {
+ length = a.length;
+ if (length != b.length) return false;
+ for (i = length; i-- !== 0; ) if (!deepEquals(a[i], b[i])) return false;
+ return true;
+ }
+
+ if (arrA != arrB) return false;
+
+ const dateA = a instanceof Date;
+ const dateB = b instanceof Date;
+ if (dateA != dateB) return false;
+ if (dateA && dateB) return a.getTime() == b.getTime();
+
+ const regexpA = a instanceof RegExp;
+ const regexpB = b instanceof RegExp;
+ if (regexpA != regexpB) return false;
+ if (regexpA && regexpB) return a.toString() == b.toString();
+
+ const keys = keyList(a);
+ length = keys.length;
+
+ if (length !== keyList(b).length) return false;
+
+ for (i = length; i-- !== 0; ) if (!hasProp.call(b, keys[i])) return false;
+
+ for (i = length; i-- !== 0; ) {
+ key = keys[i];
+ if (!deepEquals(a[key], b[key])) return false;
+ }
+
+ return true;
+ }
+
+ return a !== a && b !== b;
+}
diff --git a/packages/idb-bridge/src/util/enforceRange.ts
b/packages/idb-bridge/src/util/enforceRange.ts
new file mode 100644
index 00000000..0cf3b6c8
--- /dev/null
+++ b/packages/idb-bridge/src/util/enforceRange.ts
@@ -0,0 +1,18 @@
+// https://heycam.github.io/webidl/#EnforceRange
+
+const enforceRange = (
+ num: number,
+ type: "MAX_SAFE_INTEGER" | "unsigned long",
+) => {
+ const min = 0;
+ const max = type === "unsigned long" ? 4294967295 : 9007199254740991;
+
+ if (isNaN(num) || num < min || num > max) {
+ throw new TypeError();
+ }
+ if (num >= 0) {
+ return Math.floor(num);
+ }
+};
+
+export default enforceRange;
diff --git a/packages/idb-bridge/src/util/errors.ts
b/packages/idb-bridge/src/util/errors.ts
new file mode 100644
index 00000000..bbf9498c
--- /dev/null
+++ b/packages/idb-bridge/src/util/errors.ts
@@ -0,0 +1,120 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+/* tslint:disable: max-classes-per-file max-line-length */
+
+const messages = {
+ AbortError:
+ "A request was aborted, for example through a call to
IDBTransaction.abort.",
+ ConstraintError:
+ "A mutation operation in the transaction failed because a constraint
was not satisfied. For example, an object such as an object store or index
already exists and a request attempted to create a new one.",
+ DataCloneError:
+ "The data being stored could not be cloned by the internal structured
cloning algorithm.",
+ DataError: "Data provided to an operation does not meet requirements.",
+ InvalidAccessError:
+ "An invalid operation was performed on an object. For example
transaction creation attempt was made, but an empty scope was provided.",
+ InvalidStateError:
+ "An operation was called on an object on which it is not allowed or at
a time when it is not allowed. Also occurs if a request is made on a source
object that has been deleted or removed. Use TransactionInactiveError or
ReadOnlyError when possible, as they are more specific variations of
InvalidStateError.",
+ NotFoundError:
+ "The operation failed because the requested database object could not
be found. For example, an object store did not exist but was being opened.",
+ ReadOnlyError:
+ 'The mutating operation was attempted in a "readonly" transaction.',
+ TransactionInactiveError:
+ "A request was placed against a transaction which is currently not
active, or which is finished.",
+ VersionError:
+ "An attempt was made to open a database using a lower version than the
existing version.",
+};
+
+export class AbortError extends Error {
+ constructor(message = messages.AbortError) {
+ super();
+ this.name = "AbortError";
+ this.message = message;
+ }
+}
+
+export class ConstraintError extends Error {
+ constructor(message = messages.ConstraintError) {
+ super();
+ this.name = "ConstraintError";
+ this.message = message;
+ }
+}
+
+export class DataCloneError extends Error {
+ constructor(message = messages.DataCloneError) {
+ super();
+ this.name = "DataCloneError";
+ this.message = message;
+ }
+}
+
+export class DataError extends Error {
+ constructor(message = messages.DataError) {
+ super();
+ this.name = "DataError";
+ this.message = message;
+ }
+}
+
+export class InvalidAccessError extends Error {
+ constructor(message = messages.InvalidAccessError) {
+ super();
+ this.name = "InvalidAccessError";
+ this.message = message;
+ }
+}
+
+export class InvalidStateError extends Error {
+ constructor(message = messages.InvalidStateError) {
+ super();
+ this.name = "InvalidStateError";
+ this.message = message;
+ }
+}
+
+export class NotFoundError extends Error {
+ constructor(message = messages.NotFoundError) {
+ super();
+ this.name = "NotFoundError";
+ this.message = message;
+ }
+}
+
+export class ReadOnlyError extends Error {
+ constructor(message = messages.ReadOnlyError) {
+ super();
+ this.name = "ReadOnlyError";
+ this.message = message;
+ }
+}
+
+export class TransactionInactiveError extends Error {
+ constructor(message = messages.TransactionInactiveError) {
+ super();
+ this.name = "TransactionInactiveError";
+ this.message = message;
+ }
+}
+
+export class VersionError extends Error {
+ constructor(message = messages.VersionError) {
+ super();
+ this.name = "VersionError";
+ this.message = message;
+ }
+}
diff --git a/packages/idb-bridge/src/util/extractKey.ts
b/packages/idb-bridge/src/util/extractKey.ts
new file mode 100644
index 00000000..fd14c5a6
--- /dev/null
+++ b/packages/idb-bridge/src/util/extractKey.ts
@@ -0,0 +1,55 @@
+import { Key, KeyPath, Value } from "./types";
+import valueToKey from "./valueToKey";
+
+//
http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-extracting-a-key-from-a-value-using-a-key-path
+const extractKey = (keyPath: KeyPath, value: Value) => {
+ if (Array.isArray(keyPath)) {
+ const result: Key[] = [];
+
+ for (let item of keyPath) {
+ // This doesn't make sense to me based on the spec, but it is needed to
pass the W3C KeyPath tests (see same
+ // comment in validateKeyPath)
+ if (
+ item !== undefined &&
+ item !== null &&
+ typeof item !== "string" &&
+ (item as any).toString
+ ) {
+ item = (item as any).toString();
+ }
+ result.push(valueToKey(extractKey(item, value)));
+ }
+
+ return result;
+ }
+
+ if (keyPath === "") {
+ return value;
+ }
+
+ let remainingKeyPath: string | null = keyPath;
+ let object = value;
+
+ while (remainingKeyPath !== null) {
+ let identifier;
+
+ const i = remainingKeyPath.indexOf(".");
+ if (i >= 0) {
+ identifier = remainingKeyPath.slice(0, i);
+ remainingKeyPath = remainingKeyPath.slice(i + 1);
+ } else {
+ identifier = remainingKeyPath;
+ remainingKeyPath = null;
+ }
+
+ if (!object.hasOwnProperty(identifier)) {
+ return;
+ }
+
+ object = object[identifier];
+ }
+
+ return object;
+};
+
+export default extractKey;
diff --git a/packages/idb-bridge/src/util/fakeDOMStringList.ts
b/packages/idb-bridge/src/util/fakeDOMStringList.ts
new file mode 100644
index 00000000..5add1758
--- /dev/null
+++ b/packages/idb-bridge/src/util/fakeDOMStringList.ts
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import { FakeDOMStringList } from "./types";
+
+// Would be nicer to sublcass Array, but I'd have to sacrifice Node 4 support
to do that.
+
+const fakeDOMStringList = (arr: string[]): FakeDOMStringList => {
+ const arr2 = arr.slice();
+
+ Object.defineProperty(arr2, "contains", {
+ // tslint:disable-next-line object-literal-shorthand
+ value: (value: string) => arr2.indexOf(value) >= 0,
+ });
+
+ Object.defineProperty(arr2, "item", {
+ // tslint:disable-next-line object-literal-shorthand
+ value: (i: number) => arr2[i],
+ });
+
+ return arr2 as FakeDOMStringList;
+};
+
+export default fakeDOMStringList;
diff --git a/packages/idb-bridge/src/util/injectKey.ts
b/packages/idb-bridge/src/util/injectKey.ts
new file mode 100644
index 00000000..89d3a01d
--- /dev/null
+++ b/packages/idb-bridge/src/util/injectKey.ts
@@ -0,0 +1,48 @@
+import { KeyPath, Value, Key } from "./types";
+import canInjectKey from "./canInjectKey";
+import { DataError } from "./errors";
+import structuredClone from "./structuredClone";
+
+export function injectKey(keyPath: KeyPath, value: Value, key: Key): Value {
+ if (Array.isArray(keyPath)) {
+ // tslint:disable-next-line max-line-length
+ throw new Error(
+ "The key paths used in this section are always strings and never
sequences, since it is not possible to create a object store which has a key
generator and also has a key path that is a sequence.",
+ );
+ }
+
+ const identifiers = keyPath.split(".");
+ if (identifiers.length === 0) {
+ throw new Error("Assert: identifiers is not empty");
+ }
+
+ const lastIdentifier = identifiers.pop();
+
+ if (lastIdentifier === null || lastIdentifier === undefined) {
+ throw Error();
+ }
+
+ for (const identifier of identifiers) {
+ if (typeof value !== "object" && !Array.isArray(value)) {
+ return false;
+ }
+
+ const hop = value.hasOwnProperty(identifier);
+ if (!hop) {
+ return true;
+ }
+
+ value = value[identifier];
+ }
+
+ if (!(typeof value === "object" || Array.isArray(value))) {
+ throw new Error("can't inject key");
+ }
+
+ const newValue = structuredClone(value);
+ newValue[lastIdentifier] = structuredClone(key);
+
+ return newValue;
+}
+
+export default injectKey;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/makeStoreKeyValue.ts
b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
new file mode 100644
index 00000000..4850cec2
--- /dev/null
+++ b/packages/idb-bridge/src/util/makeStoreKeyValue.ts
@@ -0,0 +1,92 @@
+import { Value, Key, KeyPath } from "./types";
+import extractKey from "./extractKey";
+import { DataError } from "./errors";
+import valueToKey from "./valueToKey";
+import structuredClone from "./structuredClone";
+import injectKey from "./injectKey";
+
+export interface StoreKeyResult {
+ updatedKeyGenerator: number;
+ key: Key;
+ value: Value;
+}
+
+export function makeStoreKeyValue(
+ value: Value,
+ key: Key | undefined,
+ currentKeyGenerator: number,
+ autoIncrement: boolean,
+ keyPath: KeyPath | null,
+): StoreKeyResult {
+ const haveKey = key !== undefined && key !== null;
+ const haveKeyPath = keyPath !== null && keyPath !== undefined;
+
+ // This models a decision table on (haveKey, haveKeyPath, autoIncrement)
+
+ value = structuredClone(value);
+
+ if (haveKey) {
+ if (haveKeyPath) {
+ // (yes, yes, no)
+ // (yes, yes, yes)
+ throw new DataError();
+ } else {
+ if (autoIncrement) {
+ // (yes, no, yes)
+ key = valueToKey(key)!;
+ let updatedKeyGenerator: number;
+ if (typeof key !== "number") {
+ updatedKeyGenerator = currentKeyGenerator;
+ } else {
+ updatedKeyGenerator = key;
+ }
+ return {
+ key: key!,
+ value: value,
+ updatedKeyGenerator,
+ };
+ } else {
+ // (yes, no, no)
+ throw new DataError();
+ }
+ }
+ } else {
+ if (haveKeyPath) {
+ if (autoIncrement) {
+ // (no, yes, yes)
+
+ let updatedKeyGenerator: number;
+ const maybeInlineKey = extractKey(keyPath!, value);
+ if (maybeInlineKey === undefined) {
+ value = injectKey(keyPath!, value, currentKeyGenerator);
+ key = currentKeyGenerator;
+ updatedKeyGenerator = currentKeyGenerator + 1;
+ } else if (typeof maybeInlineKey === "number") {
+ key = maybeInlineKey;
+ updatedKeyGenerator = maybeInlineKey;
+ } else {
+ key = maybeInlineKey;
+ updatedKeyGenerator = currentKeyGenerator + 1;
+ }
+ return {
+ key: key,
+ value: value,
+ updatedKeyGenerator,
+ }
+ } else {
+ // (no, yes, no)
+ key = extractKey(keyPath!, value);
+ key = valueToKey(key);
+ return {
+ key: key!,
+ value: value,
+ updatedKeyGenerator: currentKeyGenerator,
+ };
+ }
+ } else {
+ // (no, no, yes)
+ // (no, no, no)
+ throw new DataError();
+ }
+ }
+}
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/openPromise.ts
b/packages/idb-bridge/src/util/openPromise.ts
new file mode 100644
index 00000000..3f6da81b
--- /dev/null
+++ b/packages/idb-bridge/src/util/openPromise.ts
@@ -0,0 +1,22 @@
+function openPromise<T>(): {
+ promise: Promise<T>;
+ resolve: (v?: T | PromiseLike<T>) => void;
+ reject: (err?: any) => void;
+} {
+ let resolve;
+ let reject;
+ const promise = new Promise<T>((resolve2, reject2) => {
+ resolve = resolve2;
+ reject = reject2;
+ });
+ if (!resolve) {
+ throw Error("broken invariant");
+ }
+ if (!reject) {
+ throw Error("broken invariant");
+ }
+
+ return { promise, resolve, reject };
+}
+
+export default openPromise;
diff --git a/packages/idb-bridge/src/util/queueTask.ts
b/packages/idb-bridge/src/util/queueTask.ts
new file mode 100644
index 00000000..7d59c226
--- /dev/null
+++ b/packages/idb-bridge/src/util/queueTask.ts
@@ -0,0 +1,21 @@
+/*
+ Copyright 2019 Florian Dold
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+ export function queueTask(fn: () => void) {
+ setImmediate(fn);
+ }
+
+ export default queueTask;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/structuredClone.ts
b/packages/idb-bridge/src/util/structuredClone.ts
new file mode 100644
index 00000000..8b6b6131
--- /dev/null
+++ b/packages/idb-bridge/src/util/structuredClone.ts
@@ -0,0 +1,15 @@
+
+function structuredCloneImpl(val: any, visited: WeakMap<any, boolean>): any {
+ // FIXME: replace with real implementation!
+ return JSON.parse(JSON.stringify(val));
+}
+
+/**
+ * Structured clone for IndexedDB.
+ */
+export function structuredClone(val: any): any {
+ const visited: WeakMap<any, boolean> = new WeakMap<any, boolean>();
+ return structuredCloneImpl(val, visited);
+}
+
+export default structuredClone;
\ No newline at end of file
diff --git a/packages/idb-bridge/src/util/types.ts
b/packages/idb-bridge/src/util/types.ts
new file mode 100644
index 00000000..7aea22ab
--- /dev/null
+++ b/packages/idb-bridge/src/util/types.ts
@@ -0,0 +1,73 @@
+/*
+ Copyright 2017 Jeremy Scheff
+ Copyright 2019 Florian Dold
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+import BridgeIDBRequest from "../BridgeIDBRequest";
+import BridgeIDBKeyRange from "../BridgeIDBKeyRange";
+import BridgeIDBIndex from "../BridgeIDBIndex";
+import BridgeIBObjectStore from "../BridgeIDBObjectStore";
+
+interface EventInCallback extends Event {
+ target: any;
+ error: Error | null;
+}
+
+export type EventCallback = (event: EventInCallback) => void;
+
+export type EventType =
+ | "abort"
+ | "blocked"
+ | "complete"
+ | "error"
+ | "success"
+ | "upgradeneeded"
+ | "versionchange";
+
+export type CursorSource = BridgeIDBIndex | BridgeIBObjectStore;
+
+
+export interface FakeDOMStringList extends Array<string> {
+ contains: (value: string) => boolean;
+ item: (i: number) => string | undefined;
+}
+
+export type BridgeIDBCursorDirection = "next" | "nextunique" | "prev" |
"prevunique";
+
+export type KeyPath = string | string[];
+
+export type Key = any;
+
+export type CursorRange = Key | BridgeIDBKeyRange | undefined;
+
+export type Value = any;
+
+export interface Record {
+ key: Key;
+ value: Key | Value; // For indexes, will be Key. For object stores, will be
Value.
+}
+
+export type TransactionMode = "readonly" | "readwrite" | "versionchange";
+
+export interface BridgeIDBDatabaseInfo {
+ name: string;
+ version: number
+};
+
+export interface RequestObj {
+ operation: () => Promise<any>;
+ request?: BridgeIDBRequest | undefined;
+ source?: any;
+}
diff --git a/packages/idb-bridge/src/util/validateKeyPath.ts
b/packages/idb-bridge/src/util/validateKeyPath.ts
new file mode 100644
index 00000000..18552a5d
--- /dev/null
+++ b/packages/idb-bridge/src/util/validateKeyPath.ts
@@ -0,0 +1,77 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+*/
+
+import { KeyPath } from "./types";
+
+// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-valid-key-path
+const validateKeyPath = (keyPath: KeyPath, parent?: "array" | "string") => {
+ // This doesn't make sense to me based on the spec, but it is needed to
pass the W3C KeyPath tests (see same
+ // comment in extractKey)
+ if (
+ keyPath !== undefined &&
+ keyPath !== null &&
+ typeof keyPath !== "string" &&
+ keyPath.toString &&
+ (parent === "array" || !Array.isArray(keyPath))
+ ) {
+ keyPath = keyPath.toString();
+ }
+
+ if (typeof keyPath === "string") {
+ if (keyPath === "" && parent !== "string") {
+ return;
+ }
+ try {
+ // https://mathiasbynens.be/demo/javascript-identifier-regex for
ECMAScript 5.1 / Unicode v7.0.0, with
+ // reserved words at beginning removed
+ // tslint:disable-next-line max-line-length
+ const validIdentifierRegex =
/^(?:[\$A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0
[...]
+ if (keyPath.length >= 1 && validIdentifierRegex.test(keyPath)) {
+ return;
+ }
+ } catch (err) {
+ throw new SyntaxError(err.message);
+ }
+ if (keyPath.indexOf(" ") >= 0) {
+ throw new SyntaxError(
+ "The keypath argument contains an invalid key path (no spaces
allowed).",
+ );
+ }
+ }
+
+ if (Array.isArray(keyPath) && keyPath.length > 0) {
+ if (parent) {
+ // No nested arrays
+ throw new SyntaxError(
+ "The keypath argument contains an invalid key path (nested
arrays).",
+ );
+ }
+ for (const part of keyPath) {
+ validateKeyPath(part, "array");
+ }
+ return;
+ } else if (typeof keyPath === "string" && keyPath.indexOf(".") >= 0) {
+ keyPath = keyPath.split(".");
+ for (const part of keyPath) {
+ validateKeyPath(part, "string");
+ }
+ return;
+ }
+
+ throw new SyntaxError();
+};
+
+export default validateKeyPath;
diff --git a/packages/idb-bridge/src/util/valueToKey.ts
b/packages/idb-bridge/src/util/valueToKey.ts
new file mode 100644
index 00000000..3a9e3678
--- /dev/null
+++ b/packages/idb-bridge/src/util/valueToKey.ts
@@ -0,0 +1,70 @@
+/*
+ Copyright 2017 Jeremy Scheff
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ or implied. See the License for the specific language governing
+ permissions and limitations under the License.
+ */
+
+
+import { DataError } from "./errors";
+import { Key } from "./types";
+
+// https://w3c.github.io/IndexedDB/#convert-a-value-to-a-input
+function valueToKey(input: any, seen?: Set<object>): Key | Key[] {
+ if (typeof input === "number") {
+ if (isNaN(input)) {
+ throw new DataError();
+ }
+ return input;
+ } else if (input instanceof Date) {
+ const ms = input.valueOf();
+ if (isNaN(ms)) {
+ throw new DataError();
+ }
+ return new Date(ms);
+ } else if (typeof input === "string") {
+ return input;
+ } else if (
+ input instanceof ArrayBuffer ||
+ (typeof ArrayBuffer !== "undefined" &&
+ ArrayBuffer.isView &&
+ ArrayBuffer.isView(input))
+ ) {
+ if (input instanceof ArrayBuffer) {
+ return new Uint8Array(input).buffer;
+ }
+ return new Uint8Array(input.buffer).buffer;
+ } else if (Array.isArray(input)) {
+ if (seen === undefined) {
+ seen = new Set();
+ } else if (seen.has(input)) {
+ throw new DataError();
+ }
+ seen.add(input);
+
+ const keys = [];
+ for (let i = 0; i < input.length; i++) {
+ const hop = input.hasOwnProperty(i);
+ if (!hop) {
+ throw new DataError();
+ }
+ const entry = input[i];
+ const key = valueToKey(entry, seen);
+ keys.push(key);
+ }
+ return keys;
+ } else {
+ throw new DataError();
+ }
+};
+
+export default valueToKey;
diff --git a/packages/idb-bridge/tsconfig.json
b/packages/idb-bridge/tsconfig.json
new file mode 100644
index 00000000..e17c3212
--- /dev/null
+++ b/packages/idb-bridge/tsconfig.json
@@ -0,0 +1,14 @@
+{
+ "compilerOptions": {
+ "lib": ["es6"],
+ "module": "commonjs",
+ "target": "es5",
+ "noImplicitAny": true,
+ "sourceMap": false,
+ "outDir": "build",
+ "noEmitOnError": true,
+ "strict": true,
+ "incremental": true
+ },
+ "include": ["src/**/*"]
+}
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new file mode 100644
index 00000000..b7ece86d
--- /dev/null
+++ b/packages/idb-bridge/yarn.lock
@@ -0,0 +1,3626 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@ava/babel-plugin-throws-helper@^3.0.0":
+ version "3.0.0"
+ resolved
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- [GNUnet-SVN] [taler-wallet-webex] branch master updated (65eb8b96 -> bf52d4b8), gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 04/07: idb: memory backend fixes, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 06/07: idb: extend test case, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 07/07: idb: make test pass, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 05/07: idb: make unique cursor work, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 03/07: idb: more tests working, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 02/07: idb: tests working, gnunet, 2019/06/25
- [GNUnet-SVN] [taler-wallet-webex] 01/07: idb wip,
gnunet <=