mirror of
https://github.com/nonebot/nonebot2.git
synced 2024-11-24 00:55:07 +08:00
457 lines
13 KiB
Python
457 lines
13 KiB
Python
r"""
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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 shlex
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import asyncio
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from itertools import product
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from argparse import Namespace
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from contextlib import AsyncExitStack
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from typing_extensions import TypedDict
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from argparse import ArgumentParser as ArgParser
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from typing import (Any, Dict, List, Type, Tuple, Union, Callable, NoReturn,
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Optional, Sequence)
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from pygtrie import CharTrie
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from nonebot.log import logger
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from nonebot.handler import Handler
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from nonebot import params, get_driver
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from nonebot.dependencies import Param
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from nonebot.exception import ParserExit
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from nonebot.typing import T_State, T_RuleChecker
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from nonebot.adapters import Bot, Event, MessageSegment
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PREFIX_KEY = "_prefix"
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SUFFIX_KEY = "_suffix"
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CMD_KEY = "command"
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RAW_CMD_KEY = "raw_command"
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CMD_RESULT = TypedDict("CMD_RESULT", {
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"command": Optional[Tuple[str, ...]],
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"raw_command": Optional[str]
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})
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SHELL_ARGS = "_args"
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SHELL_ARGV = "_argv"
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REGEX_MATCHED = "_matched"
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REGEX_GROUP = "_matched_groups"
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REGEX_DICT = "_matched_dict"
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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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HANDLER_PARAM_TYPES: List[Type[Param]] = [
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params.BotParam, params.EventParam, params.StateParam
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]
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def __init__(self,
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*checkers: Union[T_RuleChecker, Handler],
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dependency_overrides_provider: Optional[Any] = None) -> None:
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"""
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:参数:
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* ``*checkers: Union[T_RuleChecker, Handler]``: RuleChecker
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"""
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self.checkers = set(
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checker if isinstance(checker, Handler) else Handler(
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checker,
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allow_types=self.HANDLER_PARAM_TYPES,
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dependency_overrides_provider=dependency_overrides_provider)
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for checker in 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[Handler]``
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"""
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async def __call__(
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self,
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bot: Bot,
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event: Event,
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state: T_State,
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stack: Optional[AsyncExitStack] = None,
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dependency_cache: Optional[Dict[Callable[..., Any],
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Any]] = None) -> 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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* ``stack: Optional[AsyncExitStack]``: 异步上下文栈
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* ``dependency_cache: Optional[Dict[Callable[..., Any], Any]]``: 依赖缓存
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:返回:
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- ``bool``
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"""
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if not self.checkers:
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return True
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results = await asyncio.gather(
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*(checker(bot=bot,
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event=event,
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state=state,
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_stack=stack,
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_dependency_cache=dependency_cache)
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for checker in 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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if other is None:
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return self
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elif isinstance(other, Rule):
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return Rule(*self.checkers, *other.checkers)
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else:
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return Rule(*self.checkers, other)
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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[CMD_RESULT, CMD_RESULT]:
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prefix = CMD_RESULT(command=None, raw_command=None)
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suffix = CMD_RESULT(command=None, raw_command=None)
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state[PREFIX_KEY] = prefix
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state[SUFFIX_KEY] = suffix
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if event.get_type() != "message":
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return prefix, suffix
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message = event.get_message()
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message_seg: MessageSegment = message[0]
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if message_seg.is_text():
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pf = cls.prefix.longest_prefix(str(message_seg).lstrip())
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prefix[RAW_CMD_KEY] = pf.key
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prefix[CMD_KEY] = pf.value
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message_seg_r: MessageSegment = message[-1]
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if message_seg_r.is_text():
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sf = cls.suffix.longest_prefix(str(message_seg_r).rstrip()[::-1])
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suffix[RAW_CMD_KEY] = sf.key
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suffix[CMD_KEY] = sf.value
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return prefix, suffix
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def startswith(msg: Union[str, Tuple[str, ...]],
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ignorecase: bool = False) -> 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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if isinstance(msg, str):
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msg = (msg,)
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pattern = re.compile(
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f"^(?:{'|'.join(re.escape(prefix) for prefix in msg)})",
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re.IGNORECASE if ignorecase else 0)
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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 bool(pattern.match(text))
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return Rule(_startswith)
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def endswith(msg: Union[str, Tuple[str, ...]],
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ignorecase: bool = False) -> 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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if isinstance(msg, str):
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msg = (msg,)
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pattern = re.compile(
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f"(?:{'|'.join(re.escape(prefix) for prefix in msg)})$",
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re.IGNORECASE if ignorecase else 0)
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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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text = event.get_plaintext()
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return bool(pattern.search(text))
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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(event: Event) -> 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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r"""
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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(state: T_State) -> bool:
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return state[PREFIX_KEY][CMD_KEY] in commands
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return Rule(_command)
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class ArgumentParser(ArgParser):
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"""
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:说明:
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``shell_like`` 命令参数解析器，解析出错时不会退出程序。
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"""
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def _print_message(self, message, file=None):
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old_message: str = getattr(self, "message", "")
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if old_message:
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old_message += "\n"
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old_message += message
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setattr(self, "message", old_message)
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def exit(self, status: int = 0, message: Optional[str] = None):
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raise ParserExit(status=status,
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message=message or getattr(self, "message", None))
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def parse_args(self,
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args: Optional[Sequence[str]] = None,
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namespace: Optional[Namespace] = None) -> Namespace:
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setattr(self, "message", "")
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return super().parse_args(args=args,
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namespace=namespace) # type: ignore
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def shell_command(*cmds: Union[str, Tuple[str, ...]],
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parser: Optional[ArgumentParser] = None) -> Rule:
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r"""
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:说明:
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支持 ``shell_like`` 解析参数的命令形式匹配，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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可以通过 ``state["argv"]`` 获取用户输入的原始参数列表
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添加 ``parser`` 参数后, 可以自动处理消息并将结果保存在 ``state["args"]`` 中。
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:参数:
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* ``*cmds: Union[str, Tuple[str, ...]]``: 命令内容
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* ``parser: Optional[ArgumentParser]``: ``nonebot.rule.ArgumentParser`` 对象
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:示例:
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使用默认 ``command_start``, ``command_sep`` 配置，更多示例参考 ``argparse`` 标准库文档。
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.. code-block:: python
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from nonebot.rule import ArgumentParser
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parser = ArgumentParser()
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parser.add_argument("-a", action="store_true")
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rule = shell_command("ls", parser=parser)
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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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if not isinstance(parser, ArgumentParser):
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raise TypeError(
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"`parser` must be an instance of nonebot.rule.ArgumentParser")
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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 _shell_command(event: Event, state: T_State) -> bool:
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if state[PREFIX_KEY][CMD_KEY] in commands:
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message = str(event.get_message())
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strip_message = message[len(state[PREFIX_KEY][RAW_CMD_KEY]
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):].lstrip()
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state[SHELL_ARGV] = shlex.split(strip_message)
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if parser:
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try:
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args = parser.parse_args(state[SHELL_ARGV])
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state[SHELL_ARGS] = args
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except ParserExit as e:
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state[SHELL_ARGS] = e
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return True
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else:
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return False
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return Rule(_shell_command)
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def regex(regex: str, flags: Union[int, re.RegexFlag] = 0) -> Rule:
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r"""
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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"]`` ``state["_matched_groups"]`` ``state["_matched_dict"]``
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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(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[REGEX_MATCHED] = matched.group()
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state[REGEX_GROUP] = matched.groups()
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state[REGEX_DICT] = matched.groupdict()
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return True
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else:
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return False
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return Rule(_regex)
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async def _to_me(event: Event) -> bool:
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return event.is_tome()
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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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return Rule(_to_me)
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