jpayne@69: import itertools
jpayne@69: import os
jpayne@69: 
jpayne@69: from .compat import py312
jpayne@69: 
jpayne@69: from distutils import log
jpayne@69: 
jpayne@69: flatten = itertools.chain.from_iterable
jpayne@69: 
jpayne@69: 
jpayne@69: class Installer:
jpayne@69:     nspkg_ext = '-nspkg.pth'
jpayne@69: 
jpayne@69:     def install_namespaces(self):
jpayne@69:         nsp = self._get_all_ns_packages()
jpayne@69:         if not nsp:
jpayne@69:             return
jpayne@69:         filename = self._get_nspkg_file()
jpayne@69:         self.outputs.append(filename)
jpayne@69:         log.info("Installing %s", filename)
jpayne@69:         lines = map(self._gen_nspkg_line, nsp)
jpayne@69: 
jpayne@69:         if self.dry_run:
jpayne@69:             # always generate the lines, even in dry run
jpayne@69:             list(lines)
jpayne@69:             return
jpayne@69: 
jpayne@69:         with open(filename, 'wt', encoding=py312.PTH_ENCODING) as f:
jpayne@69:             # Python<3.13 requires encoding="locale" instead of "utf-8"
jpayne@69:             # See: python/cpython#77102
jpayne@69:             f.writelines(lines)
jpayne@69: 
jpayne@69:     def uninstall_namespaces(self):
jpayne@69:         filename = self._get_nspkg_file()
jpayne@69:         if not os.path.exists(filename):
jpayne@69:             return
jpayne@69:         log.info("Removing %s", filename)
jpayne@69:         os.remove(filename)
jpayne@69: 
jpayne@69:     def _get_nspkg_file(self):
jpayne@69:         filename, _ = os.path.splitext(self._get_target())
jpayne@69:         return filename + self.nspkg_ext
jpayne@69: 
jpayne@69:     def _get_target(self):
jpayne@69:         return self.target
jpayne@69: 
jpayne@69:     _nspkg_tmpl = (
jpayne@69:         "import sys, types, os",
jpayne@69:         "p = os.path.join(%(root)s, *%(pth)r)",
jpayne@69:         "importlib = __import__('importlib.util')",
jpayne@69:         "__import__('importlib.machinery')",
jpayne@69:         (
jpayne@69:             "m = "
jpayne@69:             "sys.modules.setdefault(%(pkg)r, "
jpayne@69:             "importlib.util.module_from_spec("
jpayne@69:             "importlib.machinery.PathFinder.find_spec(%(pkg)r, "
jpayne@69:             "[os.path.dirname(p)])))"
jpayne@69:         ),
jpayne@69:         ("m = m or sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))"),
jpayne@69:         "mp = (m or []) and m.__dict__.setdefault('__path__',[])",
jpayne@69:         "(p not in mp) and mp.append(p)",
jpayne@69:     )
jpayne@69:     "lines for the namespace installer"
jpayne@69: 
jpayne@69:     _nspkg_tmpl_multi = ('m and setattr(sys.modules[%(parent)r], %(child)r, m)',)
jpayne@69:     "additional line(s) when a parent package is indicated"
jpayne@69: 
jpayne@69:     def _get_root(self):
jpayne@69:         return "sys._getframe(1).f_locals['sitedir']"
jpayne@69: 
jpayne@69:     def _gen_nspkg_line(self, pkg):
jpayne@69:         pth = tuple(pkg.split('.'))
jpayne@69:         root = self._get_root()
jpayne@69:         tmpl_lines = self._nspkg_tmpl
jpayne@69:         parent, sep, child = pkg.rpartition('.')
jpayne@69:         if parent:
jpayne@69:             tmpl_lines += self._nspkg_tmpl_multi
jpayne@69:         return ';'.join(tmpl_lines) % locals() + '\n'
jpayne@69: 
jpayne@69:     def _get_all_ns_packages(self):
jpayne@69:         """Return sorted list of all package namespaces"""
jpayne@69:         pkgs = self.distribution.namespace_packages or []
jpayne@69:         return sorted(set(flatten(map(self._pkg_names, pkgs))))
jpayne@69: 
jpayne@69:     @staticmethod
jpayne@69:     def _pkg_names(pkg):
jpayne@69:         """
jpayne@69:         Given a namespace package, yield the components of that
jpayne@69:         package.
jpayne@69: 
jpayne@69:         >>> names = Installer._pkg_names('a.b.c')
jpayne@69:         >>> set(names) == set(['a', 'a.b', 'a.b.c'])
jpayne@69:         True
jpayne@69:         """
jpayne@69:         parts = pkg.split('.')
jpayne@69:         while parts:
jpayne@69:             yield '.'.join(parts)
jpayne@69:             parts.pop()
jpayne@69: 
jpayne@69: 
jpayne@69: class DevelopInstaller(Installer):
jpayne@69:     def _get_root(self):
jpayne@69:         return repr(str(self.egg_path))
jpayne@69: 
jpayne@69:     def _get_target(self):
jpayne@69:         return self.egg_link