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- """
- Copyright (c) 2017 Maximilian Remming
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in all
- copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- SOFTWARE.
- """
- import inspect
- import itertools
- import functools
- class InjectionError(Exception):
- def __init__(self):
- super().__init__(
- "Bad order of parameters in injectable function. "
- "The injectable values must be last in parameters."
- )
- def create_injector(**values):
- """Returns a wrapper that will inject values to the wrapped function.
- Raises:
- InjectionError: If the parameters in wrapped function are in bad order.
- """
- def inject(f):
- @functools.wraps(f)
- def wrapper(*args, **kwargs):
- kws = values.copy()
- kws.update(kwargs)
- kws = {i: kws[i] for i in inspect.signature(f).parameters}
- try:
- g = inspect.signature(f).bind(*args, **kws)
- g.apply_defaults()
- return f(*g.args, **g.kwargs)
- except TypeError as e:
- raise InjectionError()
- return wrapper
- return inject
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