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https://github.com/nonebot/nonebot2.git
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343 lines
10 KiB
Python
343 lines
10 KiB
Python
"""
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FrontMatter:
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sidebar_position: 4
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description: nonebot.adapters._message 模块
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"""
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import abc
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from copy import deepcopy
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from dataclasses import field, asdict, dataclass
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from typing import (
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Any,
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Dict,
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List,
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Type,
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Tuple,
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Union,
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Generic,
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TypeVar,
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Iterable,
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Optional,
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overload,
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)
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from pydantic import parse_obj_as
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from ._template import MessageTemplate
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T = TypeVar("T")
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TMS = TypeVar("TMS", bound="MessageSegment")
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TM = TypeVar("TM", bound="Message")
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@dataclass
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class MessageSegment(abc.ABC, Generic[TM]):
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"""消息段基类"""
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type: str
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"""消息段类型"""
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data: Dict[str, Any] = field(default_factory=dict)
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"""消息段数据"""
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@classmethod
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@abc.abstractmethod
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def get_message_class(cls) -> Type[TM]:
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"""获取消息数组类型"""
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raise NotImplementedError
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@abc.abstractmethod
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def __str__(self) -> str:
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"""该消息段所代表的 str，在命令匹配部分使用"""
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raise NotImplementedError
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def __len__(self) -> int:
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return len(str(self))
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def __ne__(self: T, other: T) -> bool:
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return not self == other
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def __add__(self: TMS, other: Union[str, TMS, Iterable[TMS]]) -> TM:
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return self.get_message_class()(self) + other
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def __radd__(self: TMS, other: Union[str, TMS, Iterable[TMS]]) -> TM:
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return self.get_message_class()(other) + self
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@classmethod
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def __get_validators__(cls):
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yield cls._validate
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@classmethod
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def _validate(cls, value):
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if isinstance(value, cls):
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return value
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if not isinstance(value, dict):
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raise ValueError(f"Expected dict for MessageSegment, got {type(value)}")
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return cls(**value)
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def get(self, key: str, default: Any = None):
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return asdict(self).get(key, default)
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def keys(self):
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return asdict(self).keys()
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def values(self):
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return asdict(self).values()
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def items(self):
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return asdict(self).items()
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def copy(self: T) -> T:
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return deepcopy(self)
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@abc.abstractmethod
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def is_text(self) -> bool:
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"""当前消息段是否为纯文本"""
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raise NotImplementedError
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class Message(List[TMS], abc.ABC):
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"""消息数组
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参数:
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message: 消息内容
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"""
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def __init__(
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self,
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message: Union[str, None, Iterable[TMS], TMS] = None,
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):
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super().__init__()
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if message is None:
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return
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elif isinstance(message, str):
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self.extend(self._construct(message))
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elif isinstance(message, MessageSegment):
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self.append(message)
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elif isinstance(message, Iterable):
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self.extend(message)
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else:
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self.extend(self._construct(message))
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@classmethod
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def template(cls: Type[TM], format_string: Union[str, TM]) -> MessageTemplate[TM]:
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"""创建消息模板。
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用法和 `str.format` 大致相同, 但是可以输出消息对象, 并且支持以 `Message` 对象作为消息模板
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并且提供了拓展的格式化控制符, 可以用适用于该消息类型的 `MessageSegment` 的工厂方法创建消息
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用法:
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```python
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>>> Message.template("{} {}").format("hello", "world") # 基础演示
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Message(MessageSegment(type='text', data={'text': 'hello world'}))
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>>> Message.template("{} {}").format(MessageSegment.image("file///..."), "world") # 支持消息段等对象
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Message(MessageSegment(type='image', data={'file': 'file///...'}), MessageSegment(type='text', data={'text': 'world'}))
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>>> Message.template( # 支持以Message对象作为消息模板
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... MessageSegment.text('test {event.user_id}') + MessageSegment.face(233) +
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... MessageSegment.text('test {event.message}')).format(event={'user_id':123456, 'message':'hello world'})
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Message(MessageSegment(type='text', data={'text': 'test 123456'}),
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MessageSegment(type='face', data={'face': 233}),
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MessageSegment(type='text', data={'text': 'test hello world'}))
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>>> Message.template("{link:image}").format(link='https://...') # 支持拓展格式化控制符
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Message(MessageSegment(type='image', data={'file': 'https://...'}))
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```
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参数:
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format_string: 格式化字符串
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返回:
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消息格式化器
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"""
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return MessageTemplate(format_string, cls)
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@classmethod
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@abc.abstractmethod
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def get_segment_class(cls) -> Type[TMS]:
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"""获取消息段类型"""
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raise NotImplementedError
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def __str__(self) -> str:
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return "".join(str(seg) for seg in self)
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@classmethod
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def __get_validators__(cls):
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yield cls._validate
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@classmethod
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def _validate(cls, value):
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if isinstance(value, str):
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pass
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elif isinstance(value, dict):
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value = parse_obj_as(cls.get_segment_class(), value)
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elif isinstance(value, Iterable):
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value = [parse_obj_as(cls.get_segment_class(), v) for v in value]
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else:
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raise ValueError(
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f"Expected str, dict or iterable for Message, got {type(value)}"
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)
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return cls(value)
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@staticmethod
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@abc.abstractmethod
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def _construct(msg: str) -> Iterable[TMS]:
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"""构造消息数组"""
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raise NotImplementedError
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def __add__(self: TM, other: Union[str, TMS, Iterable[TMS]]) -> TM:
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result = self.copy()
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result += other
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return result
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def __radd__(self: TM, other: Union[str, TMS, Iterable[TMS]]) -> TM:
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result = self.__class__(other)
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return result + self
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def __iadd__(self: TM, other: Union[str, TMS, Iterable[TMS]]) -> TM:
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if isinstance(other, str):
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self.extend(self._construct(other))
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elif isinstance(other, MessageSegment):
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self.append(other)
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elif isinstance(other, Iterable):
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self.extend(other)
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else:
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raise ValueError(f"Unsupported type: {type(other)}")
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return self
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@overload
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def __getitem__(self: TM, __args: str) -> TM:
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"""
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参数:
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__args: 消息段类型
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返回:
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所有类型为 `__args` 的消息段
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"""
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@overload
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def __getitem__(self, __args: Tuple[str, int]) -> TMS:
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"""
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参数:
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__args: 消息段类型和索引
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返回:
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类型为 `__args[0]` 的消息段第 `__args[1]` 个
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"""
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@overload
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def __getitem__(self: TM, __args: Tuple[str, slice]) -> TM:
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"""
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参数:
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__args: 消息段类型和切片
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返回:
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类型为 `__args[0]` 的消息段切片 `__args[1]`
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"""
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@overload
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def __getitem__(self, __args: int) -> TMS:
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"""
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参数:
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__args: 索引
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返回:
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第 `__args` 个消息段
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"""
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@overload
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def __getitem__(self: TM, __args: slice) -> TM:
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"""
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参数:
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__args: 切片
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返回:
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消息切片 `__args`
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"""
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def __getitem__(
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self: TM,
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args: Union[
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str,
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Tuple[str, int],
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Tuple[str, slice],
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int,
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slice,
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],
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) -> Union[TMS, TM]:
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arg1, arg2 = args if isinstance(args, tuple) else (args, None)
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if isinstance(arg1, int) and arg2 is None:
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return super().__getitem__(arg1)
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elif isinstance(arg1, slice) and arg2 is None:
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return self.__class__(super().__getitem__(arg1))
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elif isinstance(arg1, str) and arg2 is None:
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return self.__class__(seg for seg in self if seg.type == arg1)
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elif isinstance(arg1, str) and isinstance(arg2, int):
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return [seg for seg in self if seg.type == arg1][arg2]
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elif isinstance(arg1, str) and isinstance(arg2, slice):
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return self.__class__([seg for seg in self if seg.type == arg1][arg2])
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else:
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raise ValueError("Incorrect arguments to slice")
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def index(self, value: Union[TMS, str], *args) -> int:
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if isinstance(value, str):
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first_segment = next((seg for seg in self if seg.type == value), None)
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if first_segment is None:
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raise ValueError(f"Segment with type {value} is not in message")
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return super().index(first_segment, *args)
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return super().index(value, *args)
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def get(self: TM, type_: str, count: Optional[int] = None) -> TM:
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if count is None:
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return self[type_]
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iterator, filtered = (
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seg for seg in self if seg.type == type_
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), self.__class__()
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for _ in range(count):
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seg = next(iterator, None)
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if seg is None:
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break
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filtered.append(seg)
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return filtered
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def count(self, value: Union[TMS, str]) -> int:
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return len(self[value]) if isinstance(value, str) else super().count(value)
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def append(self: TM, obj: Union[str, TMS]) -> TM:
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"""添加一个消息段到消息数组末尾。
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参数:
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obj: 要添加的消息段
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"""
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if isinstance(obj, MessageSegment):
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super().append(obj)
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elif isinstance(obj, str):
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self.extend(self._construct(obj))
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else:
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raise ValueError(f"Unexpected type: {type(obj)} {obj}")
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return self
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def extend(self: TM, obj: Union[TM, Iterable[TMS]]) -> TM:
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"""拼接一个消息数组或多个消息段到消息数组末尾。
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参数:
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obj: 要添加的消息数组
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"""
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for segment in obj:
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self.append(segment)
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return self
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def copy(self: TM) -> TM:
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return deepcopy(self)
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def extract_plain_text(self) -> str:
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"""提取消息内纯文本消息"""
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return "".join(str(seg) for seg in self if seg.is_text())
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__autodoc__ = {
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"MessageSegment.__str__": True,
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"MessageSegment.__add__": True,
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"Message.__getitem__": True,
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"Message._construct": True,
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}
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