mirror of
https://github.com/denoland/deno.git
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161 lines
4.7 KiB
JavaScript
161 lines
4.7 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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"use strict";
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((window) => {
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const illegalConstructorKey = Symbol("illegalConstructorKey");
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function requiredArguments(
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name,
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length,
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required,
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) {
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if (length < required) {
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const errMsg = `${name} requires at least ${required} argument${
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required === 1 ? "" : "s"
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}, but only ${length} present`;
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throw new TypeError(errMsg);
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}
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}
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const objectCloneMemo = new WeakMap();
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function cloneArrayBuffer(
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srcBuffer,
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srcByteOffset,
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srcLength,
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_cloneConstructor,
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) {
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// this function fudges the return type but SharedArrayBuffer is disabled for a while anyway
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return srcBuffer.slice(
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srcByteOffset,
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srcByteOffset + srcLength,
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);
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}
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/** Clone a value in a similar way to structured cloning. It is similar to a
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* StructureDeserialize(StructuredSerialize(...)). */
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function cloneValue(value) {
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switch (typeof value) {
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case "number":
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case "string":
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case "boolean":
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case "undefined":
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case "bigint":
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return value;
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case "object": {
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if (objectCloneMemo.has(value)) {
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return objectCloneMemo.get(value);
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}
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if (value === null) {
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return value;
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}
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if (value instanceof Date) {
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return new Date(value.valueOf());
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}
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if (value instanceof RegExp) {
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return new RegExp(value);
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}
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if (value instanceof SharedArrayBuffer) {
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return value;
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}
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if (value instanceof ArrayBuffer) {
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const cloned = cloneArrayBuffer(
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value,
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0,
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value.byteLength,
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ArrayBuffer,
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);
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objectCloneMemo.set(value, cloned);
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return cloned;
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}
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if (ArrayBuffer.isView(value)) {
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const clonedBuffer = cloneValue(value.buffer);
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// Use DataViewConstructor type purely for type-checking, can be a
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// DataView or TypedArray. They use the same constructor signature,
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// only DataView has a length in bytes and TypedArrays use a length in
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// terms of elements, so we adjust for that.
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let length;
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if (value instanceof DataView) {
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length = value.byteLength;
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} else {
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length = value.length;
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}
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return new (value.constructor)(
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clonedBuffer,
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value.byteOffset,
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length,
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);
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}
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if (value instanceof Map) {
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const clonedMap = new Map();
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objectCloneMemo.set(value, clonedMap);
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value.forEach((v, k) => {
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clonedMap.set(cloneValue(k), cloneValue(v));
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});
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return clonedMap;
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}
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if (value instanceof Set) {
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// assumes that cloneValue still takes only one argument
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const clonedSet = new Set([...value].map(cloneValue));
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objectCloneMemo.set(value, clonedSet);
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return clonedSet;
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}
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// default for objects
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const clonedObj = {};
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objectCloneMemo.set(value, clonedObj);
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const sourceKeys = Object.getOwnPropertyNames(value);
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for (const key of sourceKeys) {
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clonedObj[key] = cloneValue(value[key]);
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}
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Reflect.setPrototypeOf(clonedObj, Reflect.getPrototypeOf(value));
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return clonedObj;
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}
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case "symbol":
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case "function":
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default:
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throw new DOMException("Uncloneable value in stream", "DataCloneError");
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}
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}
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const handlerSymbol = Symbol("eventHandlers");
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function makeWrappedHandler(handler) {
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function wrappedHandler(...args) {
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if (typeof wrappedHandler.handler !== "function") {
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return;
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}
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return wrappedHandler.handler.call(this, ...args);
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}
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wrappedHandler.handler = handler;
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return wrappedHandler;
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}
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function defineEventHandler(emitter, name, defaultValue = undefined) {
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// HTML specification section 8.1.5.1
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Object.defineProperty(emitter, `on${name}`, {
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get() {
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return this[handlerSymbol]?.get(name)?.handler ?? defaultValue;
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},
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set(value) {
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if (!this[handlerSymbol]) {
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this[handlerSymbol] = new Map();
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}
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let handlerWrapper = this[handlerSymbol]?.get(name);
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if (handlerWrapper) {
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handlerWrapper.handler = value;
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} else {
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handlerWrapper = makeWrappedHandler(value);
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this.addEventListener(name, handlerWrapper);
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}
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this[handlerSymbol].set(name, handlerWrapper);
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},
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configurable: true,
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enumerable: true,
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});
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}
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window.__bootstrap.webUtil = {
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illegalConstructorKey,
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requiredArguments,
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defineEventHandler,
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cloneValue,
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};
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})(this);
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