mirror of
https://github.com/nonebot/nonebot2.git
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703 lines
20 KiB
Python
703 lines
20 KiB
Python
"""本模块是 {ref}`nonebot.matcher.Matcher.rule` 的类型定义。
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每个事件响应器 {ref}`nonebot.matcher.Matcher` 拥有一个匹配规则 {ref}`nonebot.rule.Rule`
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其中是 `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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FrontMatter:
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sidebar_position: 5
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description: nonebot.rule 模块
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"""
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import re
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import shlex
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from argparse import Action
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from argparse import ArgumentError
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from itertools import chain, product
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from argparse import Namespace as Namespace
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from argparse import ArgumentParser as ArgParser
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from typing import (
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IO,
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TYPE_CHECKING,
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List,
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Type,
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Tuple,
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Union,
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TypeVar,
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Optional,
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Sequence,
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TypedDict,
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NamedTuple,
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cast,
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overload,
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)
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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.typing import T_State
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from nonebot.exception import ParserExit
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from nonebot.internal.rule import Rule as Rule
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from nonebot.params import Command, EventToMe, CommandArg
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from nonebot.adapters import Bot, Event, Message, MessageSegment
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from nonebot.consts import (
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CMD_KEY,
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PREFIX_KEY,
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REGEX_DICT,
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SHELL_ARGS,
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SHELL_ARGV,
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CMD_ARG_KEY,
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KEYWORD_KEY,
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RAW_CMD_KEY,
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REGEX_GROUP,
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ENDSWITH_KEY,
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CMD_START_KEY,
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FULLMATCH_KEY,
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REGEX_MATCHED,
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STARTSWITH_KEY,
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)
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T = TypeVar("T")
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CMD_RESULT = TypedDict(
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"CMD_RESULT",
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{
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"command": Optional[Tuple[str, ...]],
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"raw_command": Optional[str],
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"command_arg": Optional[Message[MessageSegment]],
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"command_start": Optional[str],
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},
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)
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TRIE_VALUE = NamedTuple(
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"TRIE_VALUE", [("command_start", str), ("command", Tuple[str, ...])]
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)
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class TrieRule:
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prefix: CharTrie = CharTrie()
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@classmethod
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def add_prefix(cls, prefix: str, value: TRIE_VALUE) -> None:
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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 get_value(cls, bot: Bot, event: Event, state: T_State) -> CMD_RESULT:
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prefix = CMD_RESULT(
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command=None, raw_command=None, command_arg=None, command_start=None
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)
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state[PREFIX_KEY] = prefix
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if event.get_type() != "message":
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return prefix
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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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segment_text = str(message_seg).lstrip()
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if pf := cls.prefix.longest_prefix(segment_text):
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value: TRIE_VALUE = pf.value
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prefix[RAW_CMD_KEY] = pf.key
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prefix[CMD_START_KEY] = value.command_start
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prefix[CMD_KEY] = value.command
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msg = message.copy()
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msg.pop(0)
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new_message = msg.__class__(segment_text[len(pf.key) :].lstrip())
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for new_segment in reversed(new_message):
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msg.insert(0, new_segment)
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prefix[CMD_ARG_KEY] = msg
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return prefix
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class StartswithRule:
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"""检查消息纯文本是否以指定字符串开头。
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参数:
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msg: 指定消息开头字符串元组
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ignorecase: 是否忽略大小写
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"""
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__slots__ = ("msg", "ignorecase")
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def __init__(self, msg: Tuple[str, ...], ignorecase: bool = False):
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self.msg = msg
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self.ignorecase = ignorecase
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def __repr__(self) -> str:
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return f"Startswith(msg={self.msg}, ignorecase={self.ignorecase})"
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def __eq__(self, other: object) -> bool:
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return (
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isinstance(other, StartswithRule)
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and frozenset(self.msg) == frozenset(other.msg)
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and self.ignorecase == other.ignorecase
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)
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def __hash__(self) -> int:
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return hash((frozenset(self.msg), self.ignorecase))
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async def __call__(self, 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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try:
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text = event.get_plaintext()
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except Exception:
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return False
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if match := re.match(
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f"^(?:{'|'.join(re.escape(prefix) for prefix in self.msg)})",
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text,
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re.IGNORECASE if self.ignorecase else 0,
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):
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state[STARTSWITH_KEY] = match.group()
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return True
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return False
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def startswith(msg: Union[str, Tuple[str, ...]], ignorecase: bool = False) -> Rule:
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"""匹配消息纯文本开头。
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参数:
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msg: 指定消息开头字符串元组
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ignorecase: 是否忽略大小写
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"""
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if isinstance(msg, str):
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msg = (msg,)
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return Rule(StartswithRule(msg, ignorecase))
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class EndswithRule:
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"""检查消息纯文本是否以指定字符串结尾。
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参数:
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msg: 指定消息结尾字符串元组
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ignorecase: 是否忽略大小写
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"""
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__slots__ = ("msg", "ignorecase")
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def __init__(self, msg: Tuple[str, ...], ignorecase: bool = False):
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self.msg = msg
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self.ignorecase = ignorecase
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def __repr__(self) -> str:
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return f"Endswith(msg={self.msg}, ignorecase={self.ignorecase})"
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def __eq__(self, other: object) -> bool:
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return (
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isinstance(other, EndswithRule)
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and frozenset(self.msg) == frozenset(other.msg)
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and self.ignorecase == other.ignorecase
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)
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def __hash__(self) -> int:
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return hash((frozenset(self.msg), self.ignorecase))
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async def __call__(self, 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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try:
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text = event.get_plaintext()
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except Exception:
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return False
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if match := re.search(
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f"(?:{'|'.join(re.escape(suffix) for suffix in self.msg)})$",
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text,
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re.IGNORECASE if self.ignorecase else 0,
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):
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state[ENDSWITH_KEY] = match.group()
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return True
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return False
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def endswith(msg: Union[str, Tuple[str, ...]], ignorecase: bool = False) -> Rule:
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"""匹配消息纯文本结尾。
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参数:
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msg: 指定消息开头字符串元组
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ignorecase: 是否忽略大小写
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"""
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if isinstance(msg, str):
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msg = (msg,)
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return Rule(EndswithRule(msg, ignorecase))
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class FullmatchRule:
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"""检查消息纯文本是否与指定字符串全匹配。
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参数:
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msg: 指定消息全匹配字符串元组
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ignorecase: 是否忽略大小写
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"""
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__slots__ = ("msg", "ignorecase")
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def __init__(self, msg: Tuple[str, ...], ignorecase: bool = False):
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self.msg = tuple(map(str.casefold, msg) if ignorecase else msg)
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self.ignorecase = ignorecase
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def __repr__(self) -> str:
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return f"Fullmatch(msg={self.msg}, ignorecase={self.ignorecase})"
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def __eq__(self, other: object) -> bool:
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return (
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isinstance(other, FullmatchRule)
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and frozenset(self.msg) == frozenset(other.msg)
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and self.ignorecase == other.ignorecase
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)
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def __hash__(self) -> int:
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return hash((frozenset(self.msg), self.ignorecase))
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async def __call__(self, 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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try:
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text = event.get_plaintext()
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except Exception:
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return False
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if not text:
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return False
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text = text.casefold() if self.ignorecase else text
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if text in self.msg:
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state[FULLMATCH_KEY] = text
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return True
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return False
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def fullmatch(msg: Union[str, Tuple[str, ...]], ignorecase: bool = False) -> Rule:
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"""完全匹配消息。
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参数:
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msg: 指定消息全匹配字符串元组
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ignorecase: 是否忽略大小写
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"""
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if isinstance(msg, str):
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msg = (msg,)
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return Rule(FullmatchRule(msg, ignorecase))
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class KeywordsRule:
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"""检查消息纯文本是否包含指定关键字。
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参数:
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keywords: 指定关键字元组
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"""
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__slots__ = ("keywords",)
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def __init__(self, *keywords: str):
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self.keywords = keywords
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def __repr__(self) -> str:
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return f"Keywords(keywords={self.keywords})"
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def __eq__(self, other: object) -> bool:
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return isinstance(other, KeywordsRule) and frozenset(
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self.keywords
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) == frozenset(other.keywords)
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def __hash__(self) -> int:
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return hash(frozenset(self.keywords))
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async def __call__(self, 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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try:
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text = event.get_plaintext()
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except Exception:
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return False
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if not text:
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return False
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if key := next((k for k in self.keywords if k in text), None):
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state[KEYWORD_KEY] = key
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return True
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return False
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def keyword(*keywords: str) -> Rule:
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"""匹配消息纯文本关键词。
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参数:
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keywords: 指定关键字元组
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"""
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return Rule(KeywordsRule(*keywords))
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class CommandRule:
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"""检查消息是否为指定命令。
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参数:
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cmds: 指定命令元组列表
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"""
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__slots__ = ("cmds",)
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def __init__(self, cmds: List[Tuple[str, ...]]):
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self.cmds = tuple(cmds)
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def __repr__(self) -> str:
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return f"Command(cmds={self.cmds})"
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def __eq__(self, other: object) -> bool:
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return isinstance(other, CommandRule) and frozenset(self.cmds) == frozenset(
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other.cmds
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)
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def __hash__(self) -> int:
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return hash((frozenset(self.cmds),))
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async def __call__(self, cmd: Optional[Tuple[str, ...]] = Command()) -> bool:
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return cmd in self.cmds
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def command(*cmds: Union[str, Tuple[str, ...]]) -> Rule:
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"""匹配消息命令。
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根据配置里提供的 {ref}``command_start` <nonebot.config.Config.command_start>`,
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{ref}``command_sep` <nonebot.config.Config.command_sep>` 判断消息是否为命令。
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可以通过 {ref}`nonebot.params.Command` 获取匹配成功的命令（例: `("test",)`），
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通过 {ref}`nonebot.params.RawCommand` 获取匹配成功的原始命令文本（例: `"/test"`），
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通过 {ref}`nonebot.params.CommandArg` 获取匹配成功的命令参数。
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参数:
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cmds: 命令文本或命令元组
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用法:
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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[Tuple[str, ...]] = []
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for command in cmds:
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if isinstance(command, str):
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command = (command,)
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commands.append(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]}", TRIE_VALUE(start, 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(
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f"{start}{sep.join(command)}", TRIE_VALUE(start, command)
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)
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return Rule(CommandRule(commands))
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class ArgumentParser(ArgParser):
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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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用法:
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用法与 `argparse.ArgumentParser` 相同，
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参考文档: [argparse](https://docs.python.org/3/library/argparse.html)
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"""
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if TYPE_CHECKING:
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@overload
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def parse_args(
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self, args: Optional[Sequence[Union[str, MessageSegment]]] = ...
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) -> Namespace:
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...
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@overload
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def parse_args(
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self, args: Optional[Sequence[Union[str, MessageSegment]]], namespace: None
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) -> Namespace:
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... # type: ignore[misc]
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@overload
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def parse_args(
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self, args: Optional[Sequence[Union[str, MessageSegment]]], namespace: T
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) -> T:
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...
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def parse_args(
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self,
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args: Optional[Sequence[Union[str, MessageSegment]]] = None,
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namespace: Optional[T] = None,
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) -> Union[Namespace, T]:
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...
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def _parse_optional(
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self, arg_string: Union[str, MessageSegment]
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) -> Optional[Tuple[Optional[Action], str, Optional[str]]]:
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return (
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super()._parse_optional(arg_string) if isinstance(arg_string, str) else None
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)
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def _print_message(self, message: str, file: Optional[IO[str]] = None):
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if message:
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setattr(self, "_message", getattr(self, "_message", "") + message)
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def exit(self, status: int = 0, message: Optional[str] = None):
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if message:
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self._print_message(message)
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raise ParserExit(status=status, message=getattr(self, "_message", None))
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class ShellCommandRule:
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"""检查消息是否为指定 shell 命令。
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参数:
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cmds: 指定命令元组列表
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parser: 可选参数解析器
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"""
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__slots__ = ("cmds", "parser")
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def __init__(self, cmds: List[Tuple[str, ...]], parser: Optional[ArgumentParser]):
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self.cmds = tuple(cmds)
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self.parser = parser
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def __repr__(self) -> str:
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return f"ShellCommand(cmds={self.cmds}, parser={self.parser})"
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def __eq__(self, other: object) -> bool:
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return (
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isinstance(other, ShellCommandRule)
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and frozenset(self.cmds) == frozenset(other.cmds)
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and self.parser is other.parser
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)
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def __hash__(self) -> int:
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return hash((frozenset(self.cmds), self.parser))
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async def __call__(
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self,
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state: T_State,
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cmd: Optional[Tuple[str, ...]] = Command(),
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msg: Optional[Message] = CommandArg(),
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) -> bool:
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if cmd not in self.cmds or msg is None:
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return False
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state[SHELL_ARGV] = list(
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chain.from_iterable(
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shlex.split(str(seg)) if cast(MessageSegment, seg).is_text() else (seg,)
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for seg in msg
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)
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)
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if self.parser:
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try:
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args = self.parser.parse_args(state[SHELL_ARGV])
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state[SHELL_ARGS] = args
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except ArgumentError as e:
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state[SHELL_ARGS] = ParserExit(status=2, message=str(e))
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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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def shell_command(
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*cmds: Union[str, Tuple[str, ...]], parser: Optional[ArgumentParser] = None
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) -> Rule:
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"""匹配 `shell_like` 形式的消息命令。
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根据配置里提供的 {ref}``command_start` <nonebot.config.Config.command_start>`,
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{ref}``command_sep` <nonebot.config.Config.command_sep>` 判断消息是否为命令。
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可以通过 {ref}`nonebot.params.Command` 获取匹配成功的命令（例: `("test",)`），
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通过 {ref}`nonebot.params.RawCommand` 获取匹配成功的原始命令文本（例: `"/test"`），
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通过 {ref}`nonebot.params.ShellCommandArgv` 获取解析前的参数列表（例: `["arg", "-h"]`），
|
||
通过 {ref}`nonebot.params.ShellCommandArgs` 获取解析后的参数字典（例: `{"arg": "arg", "h": True}`）。
|
||
|
||
:::warning 警告
|
||
如果参数解析失败，则通过 {ref}`nonebot.params.ShellCommandArgs`
|
||
获取的将是 {ref}`nonebot.exception.ParserExit` 异常。
|
||
:::
|
||
|
||
参数:
|
||
cmds: 命令文本或命令元组
|
||
parser: {ref}`nonebot.rule.ArgumentParser` 对象
|
||
|
||
用法:
|
||
使用默认 `command_start`, `command_sep` 配置，更多示例参考 `argparse` 标准库文档。
|
||
|
||
```python
|
||
from nonebot.rule import ArgumentParser
|
||
|
||
parser = ArgumentParser()
|
||
parser.add_argument("-a", action="store_true")
|
||
|
||
rule = shell_command("ls", parser=parser)
|
||
```
|
||
|
||
:::tip 提示
|
||
命令内容与后续消息间无需空格!
|
||
:::
|
||
"""
|
||
if parser is not None and not isinstance(parser, ArgumentParser):
|
||
raise TypeError("`parser` must be an instance of nonebot.rule.ArgumentParser")
|
||
|
||
config = get_driver().config
|
||
command_start = config.command_start
|
||
command_sep = config.command_sep
|
||
commands: List[Tuple[str, ...]] = []
|
||
for command in cmds:
|
||
if isinstance(command, str):
|
||
command = (command,)
|
||
|
||
commands.append(command)
|
||
|
||
if len(command) == 1:
|
||
for start in command_start:
|
||
TrieRule.add_prefix(f"{start}{command[0]}", TRIE_VALUE(start, command))
|
||
else:
|
||
for start, sep in product(command_start, command_sep):
|
||
TrieRule.add_prefix(
|
||
f"{start}{sep.join(command)}", TRIE_VALUE(start, command)
|
||
)
|
||
|
||
return Rule(ShellCommandRule(commands, parser))
|
||
|
||
|
||
class RegexRule:
|
||
"""检查消息字符串是否符合指定正则表达式。
|
||
|
||
参数:
|
||
regex: 正则表达式
|
||
flags: 正则表达式标记
|
||
"""
|
||
|
||
__slots__ = ("regex", "flags")
|
||
|
||
def __init__(self, regex: str, flags: int = 0):
|
||
self.regex = regex
|
||
self.flags = flags
|
||
|
||
def __repr__(self) -> str:
|
||
return f"Regex(regex={self.regex!r}, flags={self.flags})"
|
||
|
||
def __eq__(self, other: object) -> bool:
|
||
return (
|
||
isinstance(other, RegexRule)
|
||
and self.regex == other.regex
|
||
and self.flags == other.flags
|
||
)
|
||
|
||
def __hash__(self) -> int:
|
||
return hash((self.regex, self.flags))
|
||
|
||
async def __call__(self, event: Event, state: T_State) -> bool:
|
||
if event.get_type() != "message":
|
||
return False
|
||
try:
|
||
msg = event.get_message()
|
||
except Exception:
|
||
return False
|
||
if matched := re.search(self.regex, str(msg), self.flags):
|
||
state[REGEX_MATCHED] = matched.group()
|
||
state[REGEX_GROUP] = matched.groups()
|
||
state[REGEX_DICT] = matched.groupdict()
|
||
return True
|
||
else:
|
||
return False
|
||
|
||
|
||
def regex(regex: str, flags: Union[int, re.RegexFlag] = 0) -> Rule:
|
||
"""匹配符合正则表达式的消息字符串。
|
||
|
||
可以通过 {ref}`nonebot.params.RegexMatched` 获取匹配成功的字符串，
|
||
通过 {ref}`nonebot.params.RegexGroup` 获取匹配成功的 group 元组，
|
||
通过 {ref}`nonebot.params.RegexDict` 获取匹配成功的 group 字典。
|
||
|
||
参数:
|
||
regex: 正则表达式
|
||
flags: 正则表达式标记
|
||
|
||
:::tip 提示
|
||
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
|
||
:::
|
||
|
||
:::tip 提示
|
||
正则表达式匹配使用 `EventMessage` 的 `str` 字符串，而非 `EventMessage` 的 `PlainText` 纯文本字符串
|
||
:::
|
||
"""
|
||
|
||
return Rule(RegexRule(regex, flags))
|
||
|
||
|
||
class ToMeRule:
|
||
"""检查事件是否与机器人有关。"""
|
||
|
||
__slots__ = ()
|
||
|
||
def __repr__(self) -> str:
|
||
return "ToMe()"
|
||
|
||
def __eq__(self, other: object) -> bool:
|
||
return isinstance(other, ToMeRule)
|
||
|
||
def __hash__(self) -> int:
|
||
return hash((self.__class__,))
|
||
|
||
async def __call__(self, to_me: bool = EventToMe()) -> bool:
|
||
return to_me
|
||
|
||
|
||
def to_me() -> Rule:
|
||
"""匹配与机器人有关的事件。"""
|
||
|
||
return Rule(ToMeRule())
|
||
|
||
|
||
class IsTypeRule:
|
||
"""检查事件类型是否为指定类型。"""
|
||
|
||
__slots__ = ("types",)
|
||
|
||
def __init__(self, *types: Type[Event]):
|
||
self.types = types
|
||
|
||
def __repr__(self) -> str:
|
||
return f"IsType(types={tuple(type.__name__ for type in self.types)})"
|
||
|
||
def __eq__(self, other: object) -> bool:
|
||
return isinstance(other, IsTypeRule) and self.types == other.types
|
||
|
||
def __hash__(self) -> int:
|
||
return hash((self.types,))
|
||
|
||
async def __call__(self, event: Event) -> bool:
|
||
return isinstance(event, self.types)
|
||
|
||
|
||
def is_type(*types: Type[Event]) -> Rule:
|
||
"""匹配事件类型。
|
||
|
||
参数:
|
||
types: 事件类型
|
||
"""
|
||
|
||
return Rule(IsTypeRule(*types))
|
||
|
||
|
||
__autodoc__ = {
|
||
"Rule": True,
|
||
"Rule.__call__": True,
|
||
"TrieRule": False,
|
||
"ArgumentParser.exit": False,
|
||
"ArgumentParser.parse_args": False,
|
||
}
|