1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Implementation of Spack imports that uses importlib underneath.
``importlib`` is only fully implemented in Python 3.
"""
from importlib.machinery import SourceFileLoader
class PrependFileLoader(SourceFileLoader):
def __init__(self, full_name, path, prepend=None):
super(PrependFileLoader, self).__init__(full_name, path)
self.prepend = prepend
def get_data(self, path):
data = super(PrependFileLoader, self).get_data(path)
if path != self.path or self.prepend is None:
return data
else:
return self.prepend.encode() + b"\n" + data
def load_source(full_name, path, prepend=None):
"""Import a Python module from source.
Load the source file and add it to ``sys.modules``.
Args:
full_name (str): full name of the module to be loaded
path (str): path to the file that should be loaded
prepend (str, optional): some optional code to prepend to the
loaded module; e.g., can be used to inject import statements
Returns:
(ModuleType): the loaded module
"""
# use our custom loader
loader = PrependFileLoader(full_name, path, prepend)
return loader.load_module()
|