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1 import itertools
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2 import os
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3
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4 from .compat import py312
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5
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6 from distutils import log
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7
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8 flatten = itertools.chain.from_iterable
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9
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10
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11 class Installer:
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12 nspkg_ext = '-nspkg.pth'
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13
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14 def install_namespaces(self):
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15 nsp = self._get_all_ns_packages()
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16 if not nsp:
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17 return
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18 filename = self._get_nspkg_file()
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19 self.outputs.append(filename)
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20 log.info("Installing %s", filename)
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21 lines = map(self._gen_nspkg_line, nsp)
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22
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23 if self.dry_run:
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24 # always generate the lines, even in dry run
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25 list(lines)
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26 return
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27
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28 with open(filename, 'wt', encoding=py312.PTH_ENCODING) as f:
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29 # Python<3.13 requires encoding="locale" instead of "utf-8"
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30 # See: python/cpython#77102
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31 f.writelines(lines)
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32
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33 def uninstall_namespaces(self):
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34 filename = self._get_nspkg_file()
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35 if not os.path.exists(filename):
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36 return
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37 log.info("Removing %s", filename)
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38 os.remove(filename)
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39
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40 def _get_nspkg_file(self):
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41 filename, _ = os.path.splitext(self._get_target())
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42 return filename + self.nspkg_ext
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43
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44 def _get_target(self):
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45 return self.target
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46
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47 _nspkg_tmpl = (
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48 "import sys, types, os",
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49 "p = os.path.join(%(root)s, *%(pth)r)",
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50 "importlib = __import__('importlib.util')",
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51 "__import__('importlib.machinery')",
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52 (
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53 "m = "
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54 "sys.modules.setdefault(%(pkg)r, "
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55 "importlib.util.module_from_spec("
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56 "importlib.machinery.PathFinder.find_spec(%(pkg)r, "
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57 "[os.path.dirname(p)])))"
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58 ),
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59 ("m = m or sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))"),
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60 "mp = (m or []) and m.__dict__.setdefault('__path__',[])",
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61 "(p not in mp) and mp.append(p)",
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62 )
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63 "lines for the namespace installer"
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64
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65 _nspkg_tmpl_multi = ('m and setattr(sys.modules[%(parent)r], %(child)r, m)',)
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66 "additional line(s) when a parent package is indicated"
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67
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68 def _get_root(self):
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69 return "sys._getframe(1).f_locals['sitedir']"
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70
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71 def _gen_nspkg_line(self, pkg):
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72 pth = tuple(pkg.split('.'))
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73 root = self._get_root()
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74 tmpl_lines = self._nspkg_tmpl
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75 parent, sep, child = pkg.rpartition('.')
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76 if parent:
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77 tmpl_lines += self._nspkg_tmpl_multi
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78 return ';'.join(tmpl_lines) % locals() + '\n'
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79
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80 def _get_all_ns_packages(self):
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81 """Return sorted list of all package namespaces"""
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82 pkgs = self.distribution.namespace_packages or []
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83 return sorted(set(flatten(map(self._pkg_names, pkgs))))
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84
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85 @staticmethod
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86 def _pkg_names(pkg):
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87 """
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88 Given a namespace package, yield the components of that
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89 package.
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90
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91 >>> names = Installer._pkg_names('a.b.c')
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92 >>> set(names) == set(['a', 'a.b', 'a.b.c'])
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93 True
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94 """
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95 parts = pkg.split('.')
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96 while parts:
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97 yield '.'.join(parts)
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98 parts.pop()
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99
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100
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101 class DevelopInstaller(Installer):
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102 def _get_root(self):
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103 return repr(str(self.egg_path))
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104
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105 def _get_target(self):
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106 return self.egg_link
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