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import inspect |
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from collections import OrderedDict |
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from typing import Callable, Any, Union, Iterable, Dict, Tuple |
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from typish._types import Empty |
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from typish.classes._cls_dict import ClsDict |
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View Code Duplication |
class ClsFunction: |
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""" |
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ClsDict is a callable that takes a ClsDict or a dict. When called, it uses |
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the first argument to check for the right function in its body, executes it |
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and returns the result. |
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""" |
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def __init__(self, body: Union[ClsDict, |
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Dict[type, Callable], |
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Iterable[Tuple[type, Callable]], |
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Iterable[Callable]]): |
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from typish.functions._instance_of import instance_of |
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if isinstance(body, ClsDict): |
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self.body = body |
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elif isinstance(body, dict): |
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self.body = ClsDict(body) |
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elif instance_of(body, Iterable[Callable]): |
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list_of_tuples = [] |
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for func in body: |
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signature = inspect.signature(func) |
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params = list(signature.parameters.keys()) |
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if not params: |
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raise TypeError('ClsFunction expects callables that take ' |
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'at least one parameter, {} does not.' |
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.format(func.__name__)) |
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first_param = signature.parameters[params[0]] |
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hint = first_param.annotation |
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key = Any if hint == Empty else hint |
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list_of_tuples.append((key, func)) |
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self.body = ClsDict(OrderedDict(list_of_tuples)) |
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elif instance_of(body, Iterable[Tuple[type, Callable]]): |
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self.body = ClsDict(OrderedDict(body)) |
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else: |
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raise TypeError('ClsFunction expects a ClsDict or a dict that can ' |
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'be turned to a ClsDict or an iterable of ' |
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'callables.') |
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if not all(isinstance(value, Callable) for value in self.body.values()): |
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raise TypeError('ClsFunction expects a dict or ClsDict with only ' |
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'callables as values.') |
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def understands(self, item: Any) -> bool: |
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""" |
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Check to see if this ClsFunction can take item. |
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:param item: the item that is checked. |
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:return: True if this ClsFunction can take item. |
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""" |
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try: |
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self.body[item] |
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return True |
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except KeyError: |
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return False |
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def __call__(self, *args, **kwargs): |
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if not args: |
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raise TypeError('ClsFunction must be called with at least 1 ' |
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'positional argument.') |
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callable_ = self.body[args[0]] |
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try: |
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return callable_(*args, **kwargs) |
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except TypeError as err: |
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raise TypeError('Unable to call function for \'{}\': {}' |
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.format(args[0], err.args[0])) |
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ramonhagenaars /
typish
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