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annotate planemo/lib/python3.7/site-packages/setuptools/extern/__init__.py @ 1:56ad4e20f292 draft

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