140 lines
4.0 KiB
Python
140 lines
4.0 KiB
Python
# -------------------------------
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# Difficult Rocket
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# Copyright © 2020-2023 by shenjackyuanjie 3695888@qq.com
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# All rights reserved
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# -------------------------------
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import re
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from typing import Callable, List, Optional, Union
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from .descriptor import CallBackDescriptor
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try:
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from typing import Self
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except ImportError:
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from typing import TypeVar
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Self = TypeVar("Self")
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from .exception import IllegalArgumentName
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CallBack = Union[Callable[[str], None], str] # Equals to `Callable[[str], None] | str`
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# 可调用对象或字符串作为回调
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# A callable or str as callback
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ParseArgFunc = Callable[[str], Optional[type]]
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# 解析参数的函数，返回值为 None 时表示解析失败
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# function to parse argument, return None when failed
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EMPTY_WORDS = re.compile(r"\s", re.I)
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def check_once(cls, name) -> None:
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"""
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Check whether the attribute has been set.
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if so, it will raise exception `AttributeError`.
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检查属性是否已经被设置。
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如果已经被设置，将会抛出 `AttributeError` 异常。
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:param cls: class object
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:param name: attribute name
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:return: None
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"""
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if hasattr(cls, name):
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if getattr(cls, name) is not None:
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raise AttributeError(f"Attribute '{name}' has been set.")
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def check_name(name: Union[str, List[str]]) -> None:
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"""
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Check the name or shortcuts of argument(s) or flag(s).
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The name must not be empty str, and must not contains \\t or \\n or \\f or \\r.
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If that not satisfy the requirements, it will raise exception `IllegalArgumentName`.
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检查 参数或标记 的 名称或快捷方式 是否符合要求。
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名称必须是非空的字符串，且不能包含 \\t 或 \\n 或 \\f 或 \\r。
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如果不符合要求，将会抛出 `IllegalArgumentName` 异常。
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:param name: arguments
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:return: None
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"""
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if isinstance(name, str) and EMPTY_WORDS.search(name):
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raise IllegalArgumentName("The name of argument must not contains empty words.")
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elif isinstance(name, list) and all([(not isinstance(i, str)) and EMPTY_WORDS.search(i) for i in name]):
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raise IllegalArgumentName("The name of shortcut must be 'str', and must not contains empty words.")
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else:
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raise TypeError("The type of name must be 'str' or 'list[str]'.")
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class Parsed:
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...
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class Argument:
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def __init__(self, name, shortcut, optional):
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...
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class Flag:
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def __init__(self, name, shortcut):
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...
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class Literal:
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_tip = CallBackDescriptor("_tip")
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_func = CallBackDescriptor("_func")
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_err_callback = CallBackDescriptor("_err_callback")
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def __init__(self, name: str):
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self.name: str = name
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self.sub: List[Self] = []
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self._tip: Optional[str] = None
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self._func: Optional[CallBack] = None
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self._err_callback: Optional[CallBack] = None
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def __call__(self, *nodes) -> Self:
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self.sub += nodes
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return self
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def arg(
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self,
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name: str,
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shortcuts: Optional[List[str]] = None,
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optional: bool = True,
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type: Optional[type] = None
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) -> Self:
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check_name(name)
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if shortcuts is not None and len(shortcuts) != 0:
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check_name(shortcuts)
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Argument(...)
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...
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return self
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def flag(self, name: str, shortcuts: Optional[List[str]] = None) -> Self:
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check_name(name)
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if shortcuts is not None and len(shortcuts) != 0:
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check_name(shortcuts)
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Flag(...)
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...
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return self
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def error(self, callback: CallBack) -> Self:
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check_once(self, "_err_callback")
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self._err_callback = callback
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return self
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def run(self, func: CallBack) -> Self:
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check_once(self, "_func")
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self._func = func
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return self
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def tip(self, tip: CallBack) -> Self:
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check_once(self, "_tip")
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self._tip = tip
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return self
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def parse(self) -> Parsed:
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...
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def to_doc(self) -> str:
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...
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def builder(node: Literal) -> Literal:
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... |