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141 lines
3.7 KiB
141 lines
3.7 KiB
"use strict";
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// Returns "Type(value) is Object" in ES terminology.
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function isObject(value) {
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return typeof value === "object" && value !== null || typeof value === "function";
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}
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const hasOwn = Function.prototype.call.bind(Object.prototype.hasOwnProperty);
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const wrapperSymbol = Symbol("wrapper");
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const implSymbol = Symbol("impl");
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const sameObjectCaches = Symbol("SameObject caches");
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const ctorRegistrySymbol = Symbol.for("[webidl2js] constructor registry");
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function getSameObject(wrapper, prop, creator) {
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if (!wrapper[sameObjectCaches]) {
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wrapper[sameObjectCaches] = Object.create(null);
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}
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if (prop in wrapper[sameObjectCaches]) {
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return wrapper[sameObjectCaches][prop];
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}
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wrapper[sameObjectCaches][prop] = creator();
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return wrapper[sameObjectCaches][prop];
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}
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function wrapperForImpl(impl) {
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return impl ? impl[wrapperSymbol] : null;
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}
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function implForWrapper(wrapper) {
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return wrapper ? wrapper[implSymbol] : null;
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}
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function tryWrapperForImpl(impl) {
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const wrapper = wrapperForImpl(impl);
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return wrapper ? wrapper : impl;
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}
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function tryImplForWrapper(wrapper) {
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const impl = implForWrapper(wrapper);
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return impl ? impl : wrapper;
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}
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const iterInternalSymbol = Symbol("internal");
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const IteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()));
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const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () {}).prototype);
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function isArrayIndexPropName(P) {
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if (typeof P !== "string") {
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return false;
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}
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const i = P >>> 0;
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if (i === Math.pow(2, 32) - 1) {
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return false;
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}
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const s = `${i}`;
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if (P !== s) {
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return false;
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}
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return true;
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}
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const byteLengthGetter =
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Object.getOwnPropertyDescriptor(ArrayBuffer.prototype, "byteLength").get;
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function isArrayBuffer(value) {
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try {
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byteLengthGetter.call(value);
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return true;
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} catch (e) {
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return false;
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}
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}
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function iteratorResult([key, value], kind) {
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let result;
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switch (kind) {
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case "key":
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result = key;
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break;
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case "value":
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result = value;
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break;
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case "key+value":
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result = [key, value];
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break;
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}
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return { value: result, done: false };
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}
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const supportsPropertyIndex = Symbol("supports property index");
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const supportedPropertyIndices = Symbol("supported property indices");
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const supportsPropertyName = Symbol("supports property name");
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const supportedPropertyNames = Symbol("supported property names");
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const indexedGet = Symbol("indexed property get");
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const indexedSetNew = Symbol("indexed property set new");
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const indexedSetExisting = Symbol("indexed property set existing");
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const namedGet = Symbol("named property get");
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const namedSetNew = Symbol("named property set new");
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const namedSetExisting = Symbol("named property set existing");
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const namedDelete = Symbol("named property delete");
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const asyncIteratorNext = Symbol("async iterator get the next iteration result");
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const asyncIteratorReturn = Symbol("async iterator return steps");
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const asyncIteratorInit = Symbol("async iterator initialization steps");
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const asyncIteratorEOI = Symbol("async iterator end of iteration");
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module.exports = exports = {
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isObject,
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hasOwn,
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wrapperSymbol,
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implSymbol,
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getSameObject,
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ctorRegistrySymbol,
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wrapperForImpl,
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implForWrapper,
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tryWrapperForImpl,
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tryImplForWrapper,
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iterInternalSymbol,
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IteratorPrototype,
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AsyncIteratorPrototype,
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isArrayBuffer,
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isArrayIndexPropName,
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supportsPropertyIndex,
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supportedPropertyIndices,
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supportsPropertyName,
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supportedPropertyNames,
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indexedGet,
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indexedSetNew,
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indexedSetExisting,
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namedGet,
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namedSetNew,
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namedSetExisting,
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namedDelete,
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asyncIteratorNext,
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asyncIteratorReturn,
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asyncIteratorInit,
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asyncIteratorEOI,
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iteratorResult
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};
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