Merge commit '6e92d2345e8231a44556ce7d416451f5f3e6c398' as 'engine262'

engine262/src/execution-context/PrivateEnvironment.mts

@@ -0,0 +1,41 @@
+import {
+  type PrivateName, type GCMarker, Assert, JSStringValue, NullValue,
+} from '#self';
+
+/** https://tc39.es/ecma262/#sec-privateenvironment-records */
+export class PrivateEnvironmentRecord {
+  readonly OuterPrivateEnvironment: PrivateEnvironmentRecord | NullValue;
+
+  readonly Names: PrivateName[] = [];
+
+  /** https://tc39.es/ecma262/#sec-newprivateenvironment */
+  constructor(outerEnv: PrivateEnvironmentRecord | NullValue) {
+    this.OuterPrivateEnvironment = outerEnv;
+  }
+
+  mark(m: GCMarker) {
+    this.Names.forEach((name) => {
+      m(name);
+    });
+  }
+}
+
+/** https://tc39.es/ecma262/#sec-resolve-private-identifier */
+export function ResolvePrivateIdentifier(privEnv: PrivateEnvironmentRecord, identifier: JSStringValue) {
+  // 1. Let names be privEnv.[[Names]].
+  const names = privEnv.Names;
+  // 2. If names contains a Private Name whose [[Description]] is identifier, then
+  const name = names.find((n) => n.Description.stringValue() === identifier.stringValue());
+  if (name) {
+    // a. Let name be that Private Name.
+    // b. Return name.
+    return name;
+  } else { // 3. Else,
+    // a. Let outerPrivEnv be privEnv.[[OuterPrivateEnvironment]].
+    const outerPrivEnv = privEnv.OuterPrivateEnvironment;
+    // b. Assert: outerPrivEnv is not null.
+    Assert(!(outerPrivEnv instanceof NullValue));
+    // c. Return ResolvePrivateIdentifier(outerPrivEnv, identifier).
+    return ResolvePrivateIdentifier(outerPrivEnv, identifier);
+  }
+}