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annotate lib/python3.8/site-packages/pkg_resources/extern/__init__.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -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 return mod
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47 except ImportError:
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48 pass
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49 else:
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50 raise ImportError(
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51 "The '{target}' package is required; "
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52 "normally this is bundled with this package so if you get "
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53 "this warning, consult the packager of your "
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54 "distribution.".format(**locals())
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55 )
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56
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57 def install(self):
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58 """
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59 Install this importer into sys.meta_path if not already present.
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60 """
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61 if self not in sys.meta_path:
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62 sys.meta_path.append(self)
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63
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64
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65 names = 'packaging', 'pyparsing', 'six', 'appdirs'
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66 VendorImporter(__name__, names).install()