Mercurial > repos > guerler > springsuite
comparison planemo/lib/python3.7/site-packages/setuptools/extern/__init__.py @ 1:56ad4e20f292 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
| author | guerler |
|---|---|
| date | Fri, 31 Jul 2020 00:32:28 -0400 |
| parents | |
| children |
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| 0:d30785e31577 | 1:56ad4e20f292 |
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| 1 import sys | |
| 2 | |
| 3 | |
| 4 class VendorImporter: | |
| 5 """ | |
| 6 A PEP 302 meta path importer for finding optionally-vendored | |
| 7 or otherwise naturally-installed packages from root_name. | |
| 8 """ | |
| 9 | |
| 10 def __init__(self, root_name, vendored_names=(), vendor_pkg=None): | |
| 11 self.root_name = root_name | |
| 12 self.vendored_names = set(vendored_names) | |
| 13 self.vendor_pkg = vendor_pkg or root_name.replace('extern', '_vendor') | |
| 14 | |
| 15 @property | |
| 16 def search_path(self): | |
| 17 """ | |
| 18 Search first the vendor package then as a natural package. | |
| 19 """ | |
| 20 yield self.vendor_pkg + '.' | |
| 21 yield '' | |
| 22 | |
| 23 def find_module(self, fullname, path=None): | |
| 24 """ | |
| 25 Return self when fullname starts with root_name and the | |
| 26 target module is one vendored through this importer. | |
| 27 """ | |
| 28 root, base, target = fullname.partition(self.root_name + '.') | |
| 29 if root: | |
| 30 return | |
| 31 if not any(map(target.startswith, self.vendored_names)): | |
| 32 return | |
| 33 return self | |
| 34 | |
| 35 def load_module(self, fullname): | |
| 36 """ | |
| 37 Iterate over the search path to locate and load fullname. | |
| 38 """ | |
| 39 root, base, target = fullname.partition(self.root_name + '.') | |
| 40 for prefix in self.search_path: | |
| 41 try: | |
| 42 extant = prefix + target | |
| 43 __import__(extant) | |
| 44 mod = sys.modules[extant] | |
| 45 sys.modules[fullname] = mod | |
| 46 # mysterious hack: | |
| 47 # Remove the reference to the extant package/module | |
| 48 # on later Python versions to cause relative imports | |
| 49 # in the vendor package to resolve the same modules | |
| 50 # as those going through this importer. | |
| 51 if sys.version_info >= (3, ): | |
| 52 del sys.modules[extant] | |
| 53 return mod | |
| 54 except ImportError: | |
| 55 pass | |
| 56 else: | |
| 57 raise ImportError( | |
| 58 "The '{target}' package is required; " | |
| 59 "normally this is bundled with this package so if you get " | |
| 60 "this warning, consult the packager of your " | |
| 61 "distribution.".format(**locals()) | |
| 62 ) | |
| 63 | |
| 64 def install(self): | |
| 65 """ | |
| 66 Install this importer into sys.meta_path if not already present. | |
| 67 """ | |
| 68 if self not in sys.meta_path: | |
| 69 sys.meta_path.append(self) | |
| 70 | |
| 71 | |
| 72 names = 'six', 'packaging', 'pyparsing', | |
| 73 VendorImporter(__name__, names, 'setuptools._vendor').install() |