160 lines
6.4 KiB
Python
160 lines
6.4 KiB
Python
"""在大屏 JSON 副本上按路径更新组件属性，用于后端校验动作能否执行"""
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import json
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from copy import deepcopy
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from app.actions.base import BaseActionHandler
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from app.schemas.actions import UpdateAction
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from app.schemas.screen import Screen, ScreenNode
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def same_value(node: ScreenNode, action: UpdateAction) -> bool:
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"""字段已经存在、并且值和要写入的完全一样（按 JSON 比较，1 和 1.0、true 和 1 不算一样）"""
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if action.section == "name":
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current = node.name
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else:
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current = getattr(node, action.section)
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for segment in action.path:
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if (
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isinstance(current, dict)
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and isinstance(segment, str)
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and segment in current
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) or (
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isinstance(current, list)
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and type(segment) is int
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and segment < len(current)
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):
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current = current[segment]
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else:
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return False
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return json.dumps(current, sort_keys=True) == json.dumps(
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action.value, sort_keys=True
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)
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def fit_existing_path(node: ScreenNode, action: UpdateAction) -> UpdateAction:
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"""字段定义允许的路径在组件中可能还没有中间对象（例如未开启过的数值标签）
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前端只按已有路径赋值，这里把缺失的部分折叠进值里：改为更新最近的已有对象，
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值为补齐的嵌套对象；缺失的若是数组元素则无法补齐，保持原样交给执行时报错
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"""
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if action.section == "name":
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return action
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current = getattr(node, action.section) or {}
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for index, segment in enumerate(action.path[:-1]):
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if (
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isinstance(current, dict)
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and isinstance(segment, str)
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and segment not in current
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):
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rest = action.path[index + 1 :]
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if not all(isinstance(item, str) for item in rest):
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return action
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value = action.value
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for item in reversed(rest):
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value = {item: value}
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return action.model_copy(
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update={"path": action.path[: index + 1], "value": value}
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)
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if isinstance(current, dict) and isinstance(segment, str):
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current = current[segment]
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elif (
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isinstance(current, list)
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and type(segment) is int
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and segment < len(current)
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):
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current = current[segment]
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else:
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return action
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return action
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class UpdateHandler(BaseActionHandler[UpdateAction]):
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def apply(self, screen: Screen, action: UpdateAction) -> Screen:
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# 确认目标存在，后续路径访问和赋值均在大屏副本中进行
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result, target = self.copy_target(screen, action.target_id)
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# 组件名称是节点顶层字段，没有后续路径
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if action.section == "name":
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target.name = action.value
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return result
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# 未设置的 style 视为空对象，只允许直接添加末级字段
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if action.section == "style" and target.style is None:
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target.style = {}
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# 获取动作指定的属性区域，作为路径遍历的起点
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current = getattr(target, action.section)
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# 逐段访问路径，只有到达末级时才写入新值
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for index, segment in enumerate(action.path):
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# 标记当前是否为末级，用于区分继续访问和最终赋值
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last = index == len(action.path) - 1
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# 保存走到当前段的路径，异常时指出具体失败位置
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location = f"{action.section} {action.path[: index + 1]!r}"
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# 如果当前容器是字典，路径段必须是字符串键
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if isinstance(current, dict):
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if not isinstance(segment, str):
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raise ValueError(f"对象路径必须使用字符串键: {location}")
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# 中间层必须已存在，只允许在末级新增键，避免凭空构造嵌套结构
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if not last and segment not in current:
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raise ValueError(f"中间路径不存在: {location}")
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elif isinstance(current, list):
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# 数组只接受整数下标，使用精确类型判断排除 bool
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if type(segment) is not int:
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raise ValueError(f"数组路径必须使用整数下标: {location}")
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# 只允许访问已有元素，不接受负下标，也不通过赋值扩展数组
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if not 0 <= segment < len(current):
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raise ValueError(f"数组下标越界: {location}")
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else:
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# 标量或 None 不能继续按路径访问，停止执行并返回明确错误
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raise ValueError(f"路径无法继续访问，当前值不是对象或数组: {location}")
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if last:
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# 新值也复制，避免后续修改结果时影响 Action
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current[segment] = deepcopy(action.value)
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else:
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# 尚未到达末级，进入已校验存在的下一层容器
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current = current[segment]
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# 返回属性更新后的大屏副本，原始大屏和动作值均未被修改
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return result
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if __name__ == "__main__":
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screen = Screen.model_validate(
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{
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"canvas": {"width": 1920, "height": 1080},
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"nodes": [
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{
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"id": "sales-chart",
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"type": "chart",
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"layout": {"x": 100, "y": 200, "width": 400, "height": 300},
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"props": {"option": {"title": {"text": "销售额", "show": True}}},
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}
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],
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}
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)
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action = UpdateAction(
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target_id="sales-chart",
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section="props",
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path=["option", "title", "text"],
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value="月度销售额",
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)
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handler = UpdateHandler()
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final_screen = handler.apply(screen, action)
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print(final_screen.model_dump_json(indent=2))
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print("原始标题:", screen.nodes[0].props["option"]["title"]["text"])
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try:
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handler.apply(
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screen,
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UpdateAction(
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target_id="sales-chart",
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section="props",
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path=["missing", "text"],
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value="新标题",
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),
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)
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except ValueError as error:
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print("无效路径:", error)
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