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Merge pull request #13948 from Snuffleupagus/structuredClone

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Use the native `structuredClone` implementation when it's available
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Tim van der Meij 2021-10-03 13:19:36 +02:00 committed by GitHub
commit f5b79be0b7
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1 changed files with 79 additions and 68 deletions
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147
src/display/api.js
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@ -1899,83 +1899,94 @@ class PDFPageProxy {
class LoopbackPort {
constructor() {
this._listeners = [];
this._deferred = Promise.resolve(undefined);
this._deferred = Promise.resolve();
}
postMessage(obj, transfers) {
function cloneValue(value) {
function cloneValue(object) {
if (
(typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
globalThis.structuredClone
) {
return globalThis.structuredClone(object, transfers);
}
// Trying to perform a structured clone close to the spec, including
// transfers.
if (
typeof value === "function" ||
typeof value === "symbol" ||
value instanceof URL
) {
throw new Error(
`LoopbackPort.postMessage - cannot clone: ${value?.toString()}`
);
function fallbackCloneValue(value) {
if (
typeof value === "function" ||
typeof value === "symbol" ||
value instanceof URL
) {
throw new Error(
`LoopbackPort.postMessage - cannot clone: ${value?.toString()}`
);
}
if (typeof value !== "object" || value === null) {
return value;
}
if (cloned.has(value)) {
// already cloned the object
return cloned.get(value);
}
let buffer, result;
if ((buffer = value.buffer) && isArrayBuffer(buffer)) {
// We found object with ArrayBuffer (typed array).
if (transfers?.includes(buffer)) {
result = new value.constructor(
buffer,
value.byteOffset,
value.byteLength
);
} else {
result = new value.constructor(value);
}
cloned.set(value, result);
return result;
}
if (value instanceof Map) {
result = new Map();
cloned.set(value, result); // Adding to cache now for cyclic references.
for (const [key, val] of value) {
result.set(key, fallbackCloneValue(val));
}
return result;
}
if (value instanceof Set) {
result = new Set();
cloned.set(value, result); // Adding to cache now for cyclic references.
for (const val of value) {
result.add(fallbackCloneValue(val));
}
return result;
}
result = Array.isArray(value) ? [] : Object.create(null);
cloned.set(value, result); // Adding to cache now for cyclic references.
// Cloning all value and object properties, however ignoring properties
// defined via getter.
for (const i in value) {
let desc,
p = value;
while (!(desc = Object.getOwnPropertyDescriptor(p, i))) {
p = Object.getPrototypeOf(p);
}
if (typeof desc.value === "undefined") {
continue;
}
if (typeof desc.value === "function" && !value.hasOwnProperty?.(i)) {
continue;
}
result[i] = fallbackCloneValue(desc.value);
}
return result;
}
if (typeof value !== "object" || value === null) {
return value;
}
if (cloned.has(value)) {
// already cloned the object
return cloned.get(value);
}
let buffer, result;
if ((buffer = value.buffer) && isArrayBuffer(buffer)) {
// We found object with ArrayBuffer (typed array).
if (transfers?.includes(buffer)) {
result = new value.constructor(
buffer,
value.byteOffset,
value.byteLength
);
} else {
result = new value.constructor(value);
}
cloned.set(value, result);
return result;
}
if (value instanceof Map) {
result = new Map();
cloned.set(value, result); // Adding to cache now for cyclic references.
for (const [key, val] of value) {
result.set(key, cloneValue(val));
}
return result;
}
if (value instanceof Set) {
result = new Set();
cloned.set(value, result); // Adding to cache now for cyclic references.
for (const val of value) {
result.add(cloneValue(val));
}
return result;
}
result = Array.isArray(value) ? [] : Object.create(null);
cloned.set(value, result); // Adding to cache now for cyclic references.
// Cloning all value and object properties, however ignoring properties
// defined via getter.
for (const i in value) {
let desc,
p = value;
while (!(desc = Object.getOwnPropertyDescriptor(p, i))) {
p = Object.getPrototypeOf(p);
}
if (typeof desc.value === "undefined") {
continue;
}
if (typeof desc.value === "function" && !value.hasOwnProperty?.(i)) {
continue;
}
result[i] = cloneValue(desc.value);
}
return result;
const cloned = new WeakMap();
return fallbackCloneValue(object);
}
const cloned = new WeakMap();
const event = { data: cloneValue(obj) };
this._deferred.then(() => {