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One of the mechanisms briefly mentioned in PEP 660 to implement editable installs is
to create a separated directory inside ``build`` and use a .pth file to point to that
directory. In the context of this file such directory is referred as
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By collocating ``auxiliary_dir`` and the original source code, limitations
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template_varsz _TopLevelFinder.template_vars s# 9%2.335LTY5W5WXX i+1r #I{HEE !3!9r5AADD$>> _simple_layout(['a'], {"": "src"}, "/tmp/myproj")
True
>>> _simple_layout(['a', 'a.b'], {"": "src"}, "/tmp/myproj")
True
>>> _simple_layout(['a', 'a.b'], {}, "/tmp/myproj")
True
>>> _simple_layout(['a', 'a.a1', 'a.a1.a2', 'b'], {"": "src"}, "/tmp/myproj")
True
>>> _simple_layout(['a', 'a.a1', 'a.a1.a2', 'b'], {"a": "a", "b": "b"}, ".")
True
>>> _simple_layout(['a', 'a.a1', 'a.a1.a2', 'b'], {"a": "_a", "b": "_b"}, ".")
False
>>> _simple_layout(['a', 'a.a1', 'a.a1.a2', 'b'], {"a": "_a"}, "/tmp/myproj")
False
>>> _simple_layout(['a', 'a.a1', 'a.a1.a2', 'b'], {"a.a1.a2": "_a2"}, ".")
False
>>> _simple_layout(['a', 'a.b'], {"": "src", "a.b": "_ab"}, "/tmp/myproj")
False
>>> # Special cases, no packages yet:
>>> _simple_layout([], {"": "src"}, "/tmp/myproj")
True
>>> _simple_layout([], {"a": "_a", "": "src"}, "/tmp/myproj")
False
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>>> _parent_path("a", "src/a")
'src'
>>> _parent_path("b", "src/c")
'src/c'
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dd D ]Y}d |d| }t t || d }| r|| vr|V ZdS )a8 By carefully designing ``package_dir``, it is possible to implement the logical
structure of PEP 420 in a package without the corresponding directories.
Moreover a parent package can be purposefully/accidentally skipped in the discovery
phase (e.g. ``find_packages(include=["mypkg.*"])``, when ``mypkg.foo`` is included
by ``mypkg`` itself is not).
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directory) to emulate a non-editable installation.
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r{ r" r NrN )r ranger r` r r ry )r r_ partsi partial_namer_ s r@ re re s # # c>> #s5zzA~q"-- # #A 88E"1"I..L), 2FFGGD;;==
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Return ``True`` if ``pkg`` is nested inside ``parent`` both logically and in the
file system.
>>> _is_nested("a.b", "path/a/b", "a", "path/a")
True
>>> _is_nested("a.b", "path/a/b", "a", "otherpath/a")
False
>>> _is_nested("a.b", "path/a/b", "c", "path/c")
False
>>> _is_nested("a.a", "path/a/a", "a", "path/a")
True
>>> _is_nested("b.a", "path/b/a", "a", "path/a")
False
rN r" r{ )r normpathr4 stripr
startswithr )r_ r r r
norm_pkg_pathrests r@ r r s N8,,M ;;vr1 % % + +C 0 0 6 6s ; ;D >>& ! ! mu~ [ 4 8 8 ' rB dir_c Z t j | d t j | | S )zFCreate a directory ensured to be empty. Existing files may be removed.T)
ignore_errors)r rmtreer\ makedirs)r s r@ r r s, N4t,,,,K KrB c " e Zd ZddZd Zd ZdS )r r5 rW c Z || _ || _ || _ || _ g | _ d| _ d S )NF)rZ r[ r
editable_namerK dry_run)rU rZ r r r[ s r@ r z _NamespaceInstaller.__init__ s3 (
0 *"$ rB c f t j | j | j | j z S )zInstallation target.)r\ r_ r` r r nspkg_extrT s r@ _get_nspkg_filez#_NamespaceInstaller._get_nspkg_file s% w||D 143E3VWWWrB c D t t | j S )z1Where the modules/packages should be loaded from.)reprrw r[ rT s r@ _get_rootz _NamespaceInstaller._get_root# s C
&&'''rB Nr )rC rD rE r r r rI rB r@ r r sI X X X( ( ( ( (rB r a
from __future__ import annotations
import sys
from importlib.machinery import ModuleSpec, PathFinder
from importlib.machinery import all_suffixes as module_suffixes
from importlib.util import spec_from_file_location
from itertools import chain
from pathlib import Path
MAPPING: dict[str, str] = {mapping!r}
NAMESPACES: dict[str, list[str]] = {namespaces!r}
PATH_PLACEHOLDER = {name!r} + ".__path_hook__"
class _EditableFinder: # MetaPathFinder
@classmethod
def find_spec(cls, fullname: str, path=None, target=None) -> ModuleSpec | None: # type: ignore
# Top-level packages and modules (we know these exist in the FS)
if fullname in MAPPING:
pkg_path = MAPPING[fullname]
return cls._find_spec(fullname, Path(pkg_path))
# Handle immediate children modules (required for namespaces to work)
# To avoid problems with case sensitivity in the file system we delegate
# to the importlib.machinery implementation.
parent, _, child = fullname.rpartition(".")
if parent and parent in MAPPING:
return PathFinder.find_spec(fullname, path=[MAPPING[parent]])
# Other levels of nesting should be handled automatically by importlib
# using the parent path.
return None
@classmethod
def _find_spec(cls, fullname: str, candidate_path: Path) -> ModuleSpec | None:
init = candidate_path / "__init__.py"
candidates = (candidate_path.with_suffix(x) for x in module_suffixes())
for candidate in chain([init], candidates):
if candidate.exists():
return spec_from_file_location(fullname, candidate)
return None
class _EditableNamespaceFinder: # PathEntryFinder
@classmethod
def _path_hook(cls, path) -> type[_EditableNamespaceFinder]:
if path == PATH_PLACEHOLDER:
return cls
raise ImportError
@classmethod
def _paths(cls, fullname: str) -> list[str]:
paths = NAMESPACES[fullname]
if not paths and fullname in MAPPING:
paths = [MAPPING[fullname]]
# Always add placeholder, for 2 reasons:
# 1. __path__ cannot be empty for the spec to be considered namespace.
# 2. In the case of nested namespaces, we need to force
# import machinery to query _EditableNamespaceFinder again.
return [*paths, PATH_PLACEHOLDER]
@classmethod
def find_spec(cls, fullname: str, target=None) -> ModuleSpec | None: # type: ignore
if fullname in NAMESPACES:
spec = ModuleSpec(fullname, None, is_package=True)
spec.submodule_search_locations = cls._paths(fullname)
return spec
return None
@classmethod
def find_module(cls, _fullname) -> None:
return None
def install():
if not any(finder == _EditableFinder for finder in sys.meta_path):
sys.meta_path.append(_EditableFinder)
if not NAMESPACES:
return
if not any(hook == _EditableNamespaceFinder._path_hook for hook in sys.path_hooks):
# PathEntryFinder is needed to create NamespaceSpec without private APIS
sys.path_hooks.append(_EditableNamespaceFinder._path_hook)
if PATH_PLACEHOLDER not in sys.path:
sys.path.append(PATH_PLACEHOLDER) # Used just to trigger the path hook
rl r r dict[str, list[str]]c t t | d }t | || S )z_Create a string containing the code for the``MetaPathFinder`` and
``PathEntryFinder``.
c | d S )Nr rI )r s r@ z"_finder_template.. s
1 rB )r rl r r )rc r rJ _FINDER_TEMPLATEformatr s r@ rp rp sC 6'--//~~>>>??G " "g* " U UUrB c e Zd ZdZdS )r zCFile system does not seem to support either symlinks or hard links.N)rC rD rE rF rI rB r@ r r s MMMMrB r )rq rw r5 ro )r r r5 r )r r r^ r rS r r5 r )rY r r5 r )r r r^ r r[ r r5 r )r_ r r5 rw )r r r5 r )r r r r r5 r )r r r5 r )
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typesr typingr r r r rN r r r r r r r r2 r r discoveryr rY r warningsr r! r# r r$ r r% rt r& r r' r r( r typing_extensionsr) _vendor.wheel.wheelfiler+ r, getLoggerrC r r/ rS r! rK r r r r r rI r r r ra rb r re rd r r r Installerr r rp FileErrorr rI rB r@ r s
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