fix: 修正遍历列表负数结束索引

src/main/engine/runtime.integration.test.ts

@@ -197,6 +197,28 @@ describe("runFlow integration", () => {
     expect(events.filter((event) => event.type === "node.started" && event.nodeId === "accumulate")).toHaveLength(3);
   });
 
+  it("runs an array loop through the last item when end_index is -1", async () => {
+    const loop = node("loop", "logic_control_array_for_v3", {
+      array_name: "items",
+      reverse: false,
+      start_index: 0,
+      end_index: -1
+    });
+    const definition = flow("array-loop-flow", [
+      loop,
+      node("collect", "Basic_DebugOutput", { msg: "${item}" }, {}, {
+        parentId: loop.id,
+        slot: "array_for_fn"
+      })
+    ]);
+
+    const { result, events } = await execute(definition, { items: ["glm", "mini", "other", "kimi"] });
+
+    expect(result.status).toBe("succeeded");
+    expect(result.nodes.find((state) => state.nodeId === "loop")?.output).toBe(4);
+    expect(events.filter((event) => event.type === "node.started" && event.nodeId === "collect").map((event) => event.nodeId)).toHaveLength(4);
+  });
+
   it("retries a transient failure and records the successful attempt", async () => {
     const component = testComponent("Test.TransientFailure");
     let calls = 0;

src/main/engine/runtime.ts

@@ -409,7 +409,8 @@ async function executeContainer(
       const list = asArray(value);
       const reverse = String(node.values?.reverse ?? "") === "true" || String(node.values?.reverse ?? "") === "1";
       const start = Math.max(0, toNumber(node.values?.start_index, 0));
-      const end = node.values?.end_index === "" || node.values?.end_index == null ? list.length : toNumber(node.values?.end_index, list.length);
+      const requestedEnd = node.values?.end_index === "" || node.values?.end_index == null ? list.length : toNumber(node.values?.end_index, list.length);
+      const end = requestedEnd < 0 ? Math.max(start, list.length + requestedEnd + 1) : requestedEnd;
       const slice = (reverse ? [...list].reverse() : list).slice(start, end);
       let iterations = 0;
       for (let index = 0; index < slice.length; index += 1) {