71 lines
1.9 KiB
TypeScript
71 lines
1.9 KiB
TypeScript
/*
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Copyright 2017 Jeremy Scheff
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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or implied. See the License for the specific language governing
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permissions and limitations under the License.
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*/
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import { IDBValidKey } from "../idbtypes.js";
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import { DataError } from "./errors.js";
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// https://www.w3.org/TR/IndexedDB-2/#convert-a-value-to-a-key
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export function valueToKey(
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input: any,
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seen?: Set<object>,
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): IDBValidKey | IDBValidKey[] {
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if (typeof input === "number") {
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if (isNaN(input)) {
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throw new DataError();
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}
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return input;
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} else if (input instanceof Date) {
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const ms = input.valueOf();
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if (isNaN(ms)) {
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throw new DataError();
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}
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return new Date(ms);
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} else if (typeof input === "string") {
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return input;
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} else if (
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input instanceof ArrayBuffer ||
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(typeof ArrayBuffer !== "undefined" &&
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ArrayBuffer.isView &&
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ArrayBuffer.isView(input))
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) {
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if (input instanceof ArrayBuffer) {
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return new Uint8Array(input).buffer;
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}
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return new Uint8Array(input.buffer).buffer;
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} else if (Array.isArray(input)) {
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if (seen === undefined) {
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seen = new Set();
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} else if (seen.has(input)) {
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throw new DataError();
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}
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seen.add(input);
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const keys = [];
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for (let i = 0; i < input.length; i++) {
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const hop = input.hasOwnProperty(i);
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if (!hop) {
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throw new DataError();
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}
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const entry = input[i];
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const key = valueToKey(entry, seen);
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keys.push(key);
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}
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return keys;
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} else {
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throw new DataError();
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}
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}
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