Merge commit '6e92d2345e8231a44556ce7d416451f5f3e6c398' as 'engine262'

2026-08-19 00:31:06 +00:00 · 2026-03-27 10:07:29 +05:30
parent 8f26db5a1f 6e92d2345e
commit b42a69d9f8
433 changed files with 90478 additions and 0 deletions
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+import { Value } from '../value.mts';
+import { Q } from '../completion.mts';
+import { Evaluate, type ValueEvaluator } from '../evaluator.mts';
+import { TV } from '../static-semantics/all.mts';
+import type { ParseNode } from '../parser/ParseNode.mts';
+import { GetValue, ToString } from '#self';
+
+/** https://tc39.es/ecma262/#sec-template-literals-runtime-semantics-evaluation */
+//   TemplateLiteral : NoSubstitutionTemplate
+//   SubstitutionTemplate : TemplateHead Expression TemplateSpans
+//   TemplateSpans : TemplateTail
+//   TemplateSpans : TemplateMiddleList TemplateTail
+//   TemplateMiddleList : TemplateMiddle Expression
+//   TemplateMiddleList : TemplateMiddleList TemplateMiddle Expression
+//
+// (implicit)
+//   TemplateLiteral : SubstitutionTemplate
+export function* Evaluate_TemplateLiteral({ TemplateSpanList, ExpressionList }: ParseNode.TemplateLiteral): ValueEvaluator {
+  let str = '';
+  for (let i = 0; i < TemplateSpanList.length - 1; i += 1) {
+    const Expression = ExpressionList[i];
+    const head = TV(TemplateSpanList[i]);
+    // 2. Let subRef be the result of evaluating Expression.
+    const subRef = Q(yield* Evaluate(Expression));
+    // 3. Let sub be ? GetValue(subRef).
+    const sub = Q(yield* GetValue(subRef));
+    // 4. Let middle be ? ToString(sub).
+    const middle = Q(yield* ToString(sub));
+    str += head;
+    str += middle.stringValue();
+  }
+  const tail = TV(TemplateSpanList[TemplateSpanList.length - 1]);
+  return Value(str + tail);
+}