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Ecmascript proposal-realms
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Taketoshi Aono(青野健利 a.k.a brn)
September 17, 2017
Programming
1
2.5k
Ecmascript proposal-realms
現在提案中のtc39/proposal-realmsについて
ToKyoto.js#1
Taketoshi Aono(青野健利 a.k.a brn)
September 17, 2017
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Transcript
Ecmascript Proposal-Realms
せ: @brn (ꫬꅿ⨳ⵃa.k.a ـٕ٦ظ) 耵噟: ؿٗٝزؒٝسؒٝآص،٥iOSؒٝآص، ⠓爡: Cyberagent ،سذؙأةآؔRightSegment٥AI Messenger
ـؚٗ: http://abcdef.gets.b6n.ch/ Twitter: https://twitter.com/brn227 GitHub: https://github.com/brn
What is Relms? Realmsהכءٝفٕח鎉ֲהծ DOM搀׃Iframe٥Node.JSךVMٌآُ٦ٕ ְזך
What can we do? Realms⢪ֲֿהדⴽךglobalؔـآؙؑز橆㞮ד ؝٦س晙evalֿׅהָדֹկ
let realm = new Realm();! ! let outerGlobal = window;!
let innerGlobal = realm.global;! ! let f = realm.evalScript("(function() { return 17 })");! ! f() === 17 // true! ! Reflect.getPrototypeOf(f) === outerGlobal.Function.prototype // false! ! Reflect.getPrototypeOf(f) === innerGlobal.Function.prototype // true!
Hook some calls תRealmsך؝ٝأزؙٓة٦חؔـآؙؑز床ֿׅהדぐ珏 Hook㹋鄲ֿׅהָדֹկ
const r = new Realm({! evalHook(sourceText) {! return compile(sourceText);! },!
importHook(referrerNamespace, specifier) {! ...! }! });! const result = r.eval('eval("1")');! // compile('1')を呼び出して、戻り値を評価する const ns = r.eval('import("foo")');! // referrerNamespaceがnullでspecifierが"foo"!
Your own Realms Realmsכؙٓأזךד竰䪫׃ג荈ⴓ杝荈ך橆㞮欰䧭ֿׅהָד ֹկ
class FakeWindow extends Realm {! init() {! super.init();! // グローバルを初期化
let global = this.global;! ! // 各種グローバルオブジェクトを書き換え global.document = new FakeDocument(...);! global.alert = new Proxy(fakeAlert, { ... });! ...! }! }!
Limitation 植㖈ךהֿevalScriptח湫䱸؝٦س床ׁזְה꼽湡կ 㢩鿇أؙٔفزRealmsז橆㞮ד㹋遤׃ְկ https://github.com/tc39/proposal-realms/issues/71 Realms.prototype.importScript 䲿周׃גֶֹת׃կ
Status תStage-1זךד孡ꞿח䖉ְ
Summary ➬✲ָ䎢デ噟歲זךד穠圓ⴖ㹋חק׃ְկ document.writeהַ剅ֹ䳔ְִׄׯ։