后端没修完版

src/langbot/pkg/workflow/nodes/loop.py

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+"""Loop Node - iterate over items"""
+
+from __future__ import annotations
+
+from typing import Any, ClassVar
+
+from ..entities import ExecutionContext
+from ..node import WorkflowNode, workflow_node, NodePort, NodeConfig
+
+
+@workflow_node('loop')
+class LoopNode(WorkflowNode):
+    """Loop node - iterate over items"""
+
+    type_name = "loop"
+    category = "control"
+    icon = "🔁"
+    name = "loop"
+    name_zh = "循环"
+    name_en = "Loop"
+    description = "loop"
+    description_zh = "遍历项目或重复直到满足条件"
+    description_en = "Iterate over items or repeat until condition"
+
+    inputs: ClassVar[list[NodePort]] = [
+        NodePort(name="items", type="array", description="Items to iterate over", required=False),
+    ]
+    outputs: ClassVar[list[NodePort]] = [
+        NodePort(name="item", type="any", description="Current item in iteration"),
+        NodePort(name="index", type="number", description="Current iteration index"),
+        NodePort(name="results", type="array", description="All iteration results"),
+        NodePort(name="completed", type="boolean", description="Whether loop completed"),
+    ]
+    config_schema: ClassVar[list[NodeConfig]] = [
+        NodeConfig(
+            name="loop_type", type="select", required=True, default="foreach",
+            description="Type of loop",
+            label={"en_US": "Loop Type", "zh_Hans": "循环类型"},
+            options=["foreach", "while", "count"],
+        ),
+        NodeConfig(
+            name="max_iterations", type="integer", required=False, default=100,
+            description="Maximum iterations (safety limit)",
+            label={"en_US": "Max Iterations", "zh_Hans": "最大迭代次数"},
+        ),
+    ]
+
+    async def execute(self, inputs: dict[str, Any], context: ExecutionContext) -> dict[str, Any]:
+        items = inputs.get("items", [])
+        if not isinstance(items, list):
+            items = [items] if items else []
+
+        max_iterations = self.get_config("max_iterations", 100)
+        items = items[:max_iterations]
+
+        return {
+            "item": items[0] if items else None,
+            "index": 0,
+            "results": [],
+            "completed": len(items) == 0,
+            "_items": items,
+        }