fix(toml): nested table arrays (#6794)

Author: timreichen

toml/_parser.ts

@@ -209,7 +209,16 @@ function deepAssignTableArray(
     return Object.assign(target, unflat(keys, [value]));
   }
   if (Array.isArray(currentValue)) {
-    currentValue.push(value);
+    if (table.keys.length === 1) {
+      currentValue.push(value);
+    } else {
+      const last = currentValue.at(-1);
+      deepAssign(last, {
+        type: table.type,
+        keys: table.keys.slice(1),
+        value: table.value,
+      });
+    }
     return target;
   }
   if (isObject(currentValue)) {

toml/parse_test.ts

@@ -857,6 +857,20 @@ Deno.test({
   },
 });
 
+Deno.test({
+  name: "parse() handles nested table arrays",
+  fn() {
+    const content = `
+[[table]]
+foo = "foo"
+[[table.children]]
+bar = "bar"`;
+
+    const expected = { table: [{ foo: "foo", children: [{ bar: "bar" }] }] };
+    assertEquals(parse(content), expected);
+  },
+});
+
 Deno.test({
   name: "parse() doesn't pollute prototype with __proto__",
   async fn() {