2020-09-13 13:01:23 +08:00
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---
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# NoneBot.rule 模块
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## 规则
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2020-10-06 02:08:48 +08:00
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每个事件响应器 `Matcher` 拥有一个匹配规则 `Rule` ，其中是 **异步** `RuleChecker` 的集合，只有当所有 `RuleChecker` 检查结果为 `True` 时继续运行。
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2020-09-13 13:01:23 +08:00
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:::tip 提示
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2020-10-06 02:08:48 +08:00
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`RuleChecker` 既可以是 async function 也可以是 sync function，但在最终会被 `nonebot.utils.run_sync` 转换为 async function
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2020-09-13 13:01:23 +08:00
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:::
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## _class_ `Rule`
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基类：`object`
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* **说明**
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`Matcher` 规则类，当事件传递时，在 `Matcher` 运行前进行检查。
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* **示例**
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```python
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Rule(async_function) & sync_function
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# 等价于
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from nonebot.utils import run_sync
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Rule(async_function, run_sync(sync_function))
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```
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### `__init__(*checkers)`
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* **参数**
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* `*checkers: Callable[[Bot, Event, dict], Awaitable[bool]]`: **异步** RuleChecker
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### `checkers`
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* **说明**
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存储 `RuleChecker`
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* **类型**
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* `Set[Callable[[Bot, Event, dict], Awaitable[bool]]]`
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### _async_ `__call__(bot, event, state)`
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* **说明**
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检查是否符合所有规则
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* **参数**
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* `bot: Bot`: Bot 对象
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* `event: Event`: Event 对象
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* `state: dict`: 当前 State
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* **返回**
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* `bool`
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2020-09-14 20:48:03 +08:00
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## `startswith(msg)`
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* **说明**
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匹配消息开头
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* **参数**
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* `msg: str`: 消息开头字符串
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## `endswith(msg)`
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* **说明**
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匹配消息结尾
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* **参数**
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* `msg: str`: 消息结尾字符串
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2020-10-06 02:08:48 +08:00
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## `keyword(msg)`
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* **说明**
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匹配消息关键词
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* **参数**
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* `msg: str`: 关键词
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## `command(command)`
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* **说明**
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命令形式匹配，根据配置里提供的 `command_start`, `command_sep` 判断消息是否为命令。
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* **参数**
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* `command: Tuples[str, ...]`: 命令内容
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* **示例**
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使用默认 `command_start`, `command_sep` 配置
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命令 `("test",)` 可以匹配：`/test` 开头的消息
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命令 `("test", "sub")` 可以匹配”`/test.sub` 开头的消息
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:::tip 提示
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命令内容与后续消息间无需空格！
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:::
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## `regex(regex, flags=0)`
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* **说明**
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根据正则表达式进行匹配
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* **参数**
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* `regex: str`: 正则表达式
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* `flags: Union[int, re.RegexFlag]`: 正则标志
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## `to_me()`
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* **说明**
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通过 `event.to_me` 判断消息是否是发送给机器人
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* **参数**
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* 无
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