From 30091e817e751cf09f44ee8b16859e3fd7243851 Mon Sep 17 00:00:00 2001
From: ExE Boss <3889017+ExE-Boss@users.noreply.github.com>
Date: Fri, 14 Feb 2020 01:00:00 +0100
Subject: [PATCH] =?UTF-8?q?refactor:=20Move=C2=A0named=C2=A0property=20vis?=
 =?UTF-8?q?ibility=C2=A0algorithm=20to=C2=A0`utils.js`?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/constructs/interface.js     | 13 +++----
 lib/output/utils.js             | 17 +++++++++
 test/__snapshots__/test.js.snap | 66 +++++++++++++++++----------------
 3 files changed, 57 insertions(+), 39 deletions(-)

diff --git a/lib/constructs/interface.js b/lib/constructs/interface.js
index 09f0900d..9f35e20b 100644
--- a/lib/constructs/interface.js
+++ b/lib/constructs/interface.js
@@ -625,7 +625,7 @@ class Interface {
     if (this.overrideBuiltins) {
       conditions.push(`!utils.hasOwn(${O}, ${P})`);
     } else {
-      conditions.push(`!(${P} in ${O})`);
+      conditions.push(`utils.isNamedPropertyVisible(${P}, ${O})`);
     }
     return conditions.join(" && ");
   }
@@ -835,7 +835,7 @@ class Interface {
       const func = this.namedGetter.name ? `.${this.namedGetter.name}` : "[utils.namedGet]";
       const enumerable = !utils.getExtAttr(this.idl.extAttrs, "LegacyUnenumerableNamedProperties");
       let preamble = "";
-      const conditions = [];
+      const conditions = ["!ignoreNamedProps"];
       if (utils.getExtAttr(this.namedGetter.extAttrs, "WebIDL2JSValueAsUnsupported")) {
         this.str += `
           const namedValue = target[impl]${func}(P);
@@ -848,7 +848,6 @@ class Interface {
         `;
         conditions.push(this.namedPropertyVisible("P", "target", false));
       }
-      conditions.push("!ignoreNamedProps");
       this.str += `
           if (${conditions.join(" && ")}) {
             ${preamble}
@@ -1136,10 +1135,9 @@ class Interface {
     this.str += `
 
       const NamedPropertiesObject = new Proxy(
-        Object.create(
-          globalObject.${idl.inheritance ? idl.inheritance : "Object"}.prototype,
-          { [Symbol.toStringTag]: { value: "${name}Properties", configurable: true } }
-        ),
+        Object.create(globalObject.${idl.inheritance ? idl.inheritance : "Object"}.prototype, {
+          [Symbol.toStringTag]: { value: "${name}Properties", configurable: true },
+        }),
         {
     `;
 
@@ -1260,6 +1258,7 @@ class Interface {
     `;
 
     this.str += `
+      utils.registerNamedPropertiesObject(NamedPropertiesObject);
       Object.setPrototypeOf(${name}.prototype, NamedPropertiesObject);
     `;
   }
diff --git a/lib/output/utils.js b/lib/output/utils.js
index c020d0b0..8fc318ec 100644
--- a/lib/output/utils.js
+++ b/lib/output/utils.js
@@ -74,6 +74,21 @@ function isArrayBuffer(value) {
   }
 }
 
+const namedPropertiesObjects = new WeakSet();
+function registerNamedPropertiesObject(obj) {
+  namedPropertiesObjects.add(obj);
+}
+
+function isNamedPropertyVisible(P, O) {
+  while (O !== null) {
+    if (!namedPropertiesObjects.has(O) && hasOwn(O, P)) {
+      return false;
+    }
+    O = Object.getPrototypeOf(O);
+  }
+  return true;
+}
+
 const supportsPropertyIndex = Symbol("supports property index");
 const supportedPropertyIndices = Symbol("supported property indices");
 const supportsPropertyName = Symbol("supports property name");
@@ -101,6 +116,8 @@ module.exports = exports = {
   IteratorPrototype,
   isArrayBuffer,
   isArrayIndexPropName,
+  registerNamedPropertiesObject,
+  isNamedPropertyVisible,
   supportsPropertyIndex,
   supportedPropertyIndices,
   supportsPropertyName,
diff --git a/test/__snapshots__/test.js.snap b/test/__snapshots__/test.js.snap
index 6a25ef4b..d04b8a64 100644
--- a/test/__snapshots__/test.js.snap
+++ b/test/__snapshots__/test.js.snap
@@ -465,7 +465,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -482,7 +482,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl][utils.namedGet](P);
 
       return {
@@ -594,7 +594,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       CEReactions.preSteps(globalObject);
       try {
         target[impl][utils.namedDelete](P);
@@ -3398,7 +3398,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -3415,7 +3415,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl].getItem(P);
 
       return {
@@ -3507,7 +3507,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       target[impl].removeItem(P);
       return true;
     }
@@ -5907,7 +5907,7 @@ const proxyHandler = {
     }
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -5940,7 +5940,7 @@ const proxyHandler = {
 
     const namedValue = target[impl].namedItem(P);
 
-    if (namedValue !== null && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && namedValue !== null && utils.isNamedPropertyVisible(P, target)) {
       return {
         writable: false,
         enumerable: false,
@@ -6035,7 +6035,7 @@ const proxyHandler = {
       return !(target[impl].item(index) !== undefined);
     }
 
-    if (target[impl].namedItem(P) !== null && !(P in target)) {
+    if (target[impl].namedItem(P) !== null && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -6219,7 +6219,7 @@ const proxyHandler = {
     }
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -6252,7 +6252,7 @@ const proxyHandler = {
 
     const namedValue = target[impl].namedItem(P);
 
-    if (namedValue !== null && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && namedValue !== null && utils.isNamedPropertyVisible(P, target)) {
       return {
         writable: true,
         enumerable: true,
@@ -6376,7 +6376,7 @@ const proxyHandler = {
       return !(target[impl].item(index) !== undefined);
     }
 
-    if (target[impl].namedItem(P) !== null && !(P in target)) {
+    if (target[impl].namedItem(P) !== null && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -6947,7 +6947,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -6964,7 +6964,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl][utils.namedGet](P);
 
       return {
@@ -7068,7 +7068,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -7646,7 +7646,7 @@ exports.install = function install(globalObject) {
           return Reflect.getOwnPropertyDescriptor(target, P);
         }
 
-        if (object[impl][utils.supportsPropertyName](P) && !(P in object)) {
+        if (object[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, object)) {
           const namedValue = object[impl][utils.namedGet](P);
 
           return {
@@ -7678,6 +7678,7 @@ exports.install = function install(globalObject) {
     }
   );
 
+  utils.registerNamedPropertiesObject(NamedPropertiesObject);
   Object.setPrototypeOf(Window.prototype, NamedPropertiesObject);
 
   if (globalObject[ctorRegistry] === undefined) {
@@ -8256,7 +8257,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -8273,7 +8274,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl][utils.namedGet](P);
 
       return {
@@ -8375,7 +8376,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       target[impl][utils.namedDelete](P);
       return true;
     }
@@ -11173,7 +11174,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -11190,7 +11191,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl].getItem(P);
 
       return {
@@ -11282,7 +11283,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       target[impl].removeItem(P);
       return true;
     }
@@ -13682,7 +13683,7 @@ const proxyHandler = {
     }
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -13715,7 +13716,7 @@ const proxyHandler = {
 
     const namedValue = target[impl].namedItem(P);
 
-    if (namedValue !== null && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && namedValue !== null && utils.isNamedPropertyVisible(P, target)) {
       return {
         writable: false,
         enumerable: false,
@@ -13810,7 +13811,7 @@ const proxyHandler = {
       return !(target[impl].item(index) !== undefined);
     }
 
-    if (target[impl].namedItem(P) !== null && !(P in target)) {
+    if (target[impl].namedItem(P) !== null && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -13994,7 +13995,7 @@ const proxyHandler = {
     }
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -14027,7 +14028,7 @@ const proxyHandler = {
 
     const namedValue = target[impl].namedItem(P);
 
-    if (namedValue !== null && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && namedValue !== null && utils.isNamedPropertyVisible(P, target)) {
       return {
         writable: true,
         enumerable: true,
@@ -14151,7 +14152,7 @@ const proxyHandler = {
       return !(target[impl].item(index) !== undefined);
     }
 
-    if (target[impl].namedItem(P) !== null && !(P in target)) {
+    if (target[impl].namedItem(P) !== null && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -14722,7 +14723,7 @@ const proxyHandler = {
     const keys = new Set();
 
     for (const key of target[impl][utils.supportedPropertyNames]) {
-      if (!(key in target)) {
+      if (utils.isNamedPropertyVisible(key, target)) {
         keys.add(\`\${key}\`);
       }
     }
@@ -14739,7 +14740,7 @@ const proxyHandler = {
     }
     let ignoreNamedProps = false;
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target) && !ignoreNamedProps) {
+    if (!ignoreNamedProps && target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       const namedValue = target[impl][utils.namedGet](P);
 
       return {
@@ -14843,7 +14844,7 @@ const proxyHandler = {
       return Reflect.deleteProperty(target, P);
     }
 
-    if (target[impl][utils.supportsPropertyName](P) && !(P in target)) {
+    if (target[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, target)) {
       return false;
     }
 
@@ -15421,7 +15422,7 @@ exports.install = function install(globalObject) {
           return Reflect.getOwnPropertyDescriptor(target, P);
         }
 
-        if (object[impl][utils.supportsPropertyName](P) && !(P in object)) {
+        if (object[impl][utils.supportsPropertyName](P) && utils.isNamedPropertyVisible(P, object)) {
           const namedValue = object[impl][utils.namedGet](P);
 
           return {
@@ -15453,6 +15454,7 @@ exports.install = function install(globalObject) {
     }
   );
 
+  utils.registerNamedPropertiesObject(NamedPropertiesObject);
   Object.setPrototypeOf(Window.prototype, NamedPropertiesObject);
 
   if (globalObject[ctorRegistry] === undefined) {