mirror of
https://github.com/nonebot/nonebot2.git
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328 lines
8.7 KiB
Python
328 lines
8.7 KiB
Python
"""
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规则
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====
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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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\:\:\:tip 提示
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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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\:\:\:
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"""
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import re
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import asyncio
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from itertools import product
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from typing import Any, Dict, Union, Tuple, Optional, Callable, NoReturn, Awaitable, TYPE_CHECKING
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from pygtrie import CharTrie
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from nonebot import get_driver
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from nonebot.log import logger
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from nonebot.utils import run_sync
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from nonebot.typing import T_State, T_RuleChecker
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if TYPE_CHECKING:
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from nonebot.adapters import Bot, Event
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class Rule:
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"""
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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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.. code-block:: 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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__slots__ = ("checkers",)
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def __init__(
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self, *checkers: Callable[["Bot", "Event", T_State],
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Awaitable[bool]]) -> None:
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"""
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:参数:
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* ``*checkers: Callable[[Bot, Event, T_State], Awaitable[bool]]``: **异步** RuleChecker
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"""
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self.checkers = set(checkers)
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"""
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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, T_State], Awaitable[bool]]]``
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"""
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async def __call__(self, bot: "Bot", event: "Event",
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state: T_State) -> bool:
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"""
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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: T_State``: 当前 State
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:返回:
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- ``bool``
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"""
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results = await asyncio.gather(
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*map(lambda c: c(bot, event, state), self.checkers))
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return all(results)
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def __and__(self, other: Optional[Union["Rule", T_RuleChecker]]) -> "Rule":
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checkers = self.checkers.copy()
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if other is None:
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return self
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elif isinstance(other, Rule):
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checkers |= other.checkers
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elif asyncio.iscoroutinefunction(other):
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checkers.add(other) # type: ignore
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else:
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checkers.add(run_sync(other))
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return Rule(*checkers)
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def __or__(self, other) -> NoReturn:
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raise RuntimeError("Or operation between rules is not allowed.")
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class TrieRule:
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prefix: CharTrie = CharTrie()
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suffix: CharTrie = CharTrie()
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@classmethod
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def add_prefix(cls, prefix: str, value: Any):
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if prefix in cls.prefix:
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logger.warning(f'Duplicated prefix rule "{prefix}"')
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return
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cls.prefix[prefix] = value
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@classmethod
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def add_suffix(cls, suffix: str, value: Any):
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if suffix[::-1] in cls.suffix:
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logger.warning(f'Duplicated suffix rule "{suffix}"')
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return
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cls.suffix[suffix[::-1]] = value
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@classmethod
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def get_value(cls, bot: "Bot", event: "Event",
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state: T_State) -> Tuple[Dict[str, Any], Dict[str, Any]]:
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if event.get_type() != "message":
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state["_prefix"] = {"raw_command": None, "command": None}
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state["_suffix"] = {"raw_command": None, "command": None}
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return {
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"raw_command": None,
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"command": None
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}, {
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"raw_command": None,
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"command": None
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}
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prefix = None
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suffix = None
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message = event.get_message()
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message_seg = message[0]
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if message_seg.is_text():
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prefix = cls.prefix.longest_prefix(str(message_seg).lstrip())
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message_seg_r = message[-1]
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if message_seg_r.is_text():
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suffix = cls.suffix.longest_prefix(
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str(message_seg_r).rstrip()[::-1])
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state["_prefix"] = {
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"raw_command": prefix.key,
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"command": prefix.value
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} if prefix else {
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"raw_command": None,
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"command": None
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}
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state["_suffix"] = {
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"raw_command": suffix.key,
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"command": suffix.value
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} if suffix else {
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"raw_command": None,
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"command": None
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}
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return ({
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"raw_command": prefix.key,
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"command": prefix.value
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} if prefix else {
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"raw_command": None,
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"command": None
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}, {
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"raw_command": suffix.key,
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"command": suffix.value
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} if suffix else {
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"raw_command": None,
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"command": None
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})
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def startswith(msg: str) -> Rule:
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"""
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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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"""
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async def _startswith(bot: "Bot", event: "Event", state: T_State) -> bool:
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if event.get_type() != "message":
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return False
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text = event.get_plaintext()
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return text.startswith(msg)
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return Rule(_startswith)
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def endswith(msg: str) -> Rule:
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"""
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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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"""
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async def _endswith(bot: "Bot", event: "Event", state: T_State) -> bool:
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if event.get_type() != "message":
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return False
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return event.get_plaintext().endswith(msg)
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return Rule(_endswith)
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def keyword(*keywords: str) -> Rule:
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"""
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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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* ``*keywords: str``: 关键词
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"""
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async def _keyword(bot: "Bot", event: "Event", state: T_State) -> bool:
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if event.get_type() != "message":
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return False
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text = event.get_plaintext()
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return bool(text and any(keyword in text for keyword in keywords))
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return Rule(_keyword)
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def command(*cmds: Union[str, Tuple[str, ...]]) -> Rule:
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"""
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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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可以通过 ``state["_prefix"]["command"]`` 获取匹配成功的命令（例：``("test",)``），通过 ``state["_prefix"]["raw_command"]`` 获取匹配成功的原始命令文本（例：``"/test"``）。
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:参数:
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* ``*cmds: Union[str, Tuple[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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"""
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config = get_driver().config
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command_start = config.command_start
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command_sep = config.command_sep
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commands = list(cmds)
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for index, command in enumerate(commands):
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if isinstance(command, str):
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commands[index] = command = (command,)
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if len(command) == 1:
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for start in command_start:
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TrieRule.add_prefix(f"{start}{command[0]}", command)
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else:
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for start, sep in product(command_start, command_sep):
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TrieRule.add_prefix(f"{start}{sep.join(command)}", command)
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async def _command(bot: "Bot", event: "Event", state: T_State) -> bool:
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return state["_prefix"]["command"] in commands
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return Rule(_command)
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def regex(regex: str, flags: Union[int, re.RegexFlag] = 0) -> Rule:
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"""
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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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可以通过 ``state["_matched"]`` 获取正则表达式匹配成功的文本。
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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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\:\:\:tip 提示
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正则表达式匹配使用 search 而非 match，如需从头匹配请使用 ``r"^xxx"`` 来确保匹配开头
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\:\:\:
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"""
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pattern = re.compile(regex, flags)
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async def _regex(bot: "Bot", event: "Event", state: T_State) -> bool:
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if event.get_type() != "message":
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return False
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matched = pattern.search(str(event.get_message()))
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if matched:
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state["_matched"] = matched.group()
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return True
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else:
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state["_matched"] = None
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return False
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return Rule(_regex)
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def to_me() -> Rule:
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"""
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:说明:
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通过 ``event.is_tome()`` 判断事件是否与机器人有关
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:参数:
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* 无
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"""
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async def _to_me(bot: "Bot", event: "Event", state: T_State) -> bool:
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return event.is_tome()
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return Rule(_to_me)
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