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importcompletion.py
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# The MIT License
#
# Copyright (c) 2009-2011 Andreas Stuehrk
# Copyright (c) 2020-2021 Sebastian Ramacher
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import fnmatch
import importlib.machinery
import sys
import warnings
from dataclasses import dataclass
from pathlib import Path
from collections.abc import Generator, Sequence, Iterable
from .line import (
current_word,
current_import,
current_from_import_from,
current_from_import_import,
)
SUFFIXES = importlib.machinery.all_suffixes()
LOADERS = (
(
importlib.machinery.ExtensionFileLoader,
importlib.machinery.EXTENSION_SUFFIXES,
),
(
importlib.machinery.SourceFileLoader,
importlib.machinery.SOURCE_SUFFIXES,
),
)
@dataclass(frozen=True, slots=True)
class _LoadedInode:
dev: int
inode: int
class ModuleGatherer:
def __init__(
self,
paths: Iterable[str | Path] | None = None,
skiplist: Sequence[str] | None = None,
) -> None:
"""Initialize module gatherer with all modules in `paths`, which should be a list of
directory names. If `paths` is not given, `sys.path` will be used."""
# Cached list of all known modules
self.modules: set[str] = set()
# Set of (st_dev, st_ino) to compare against so that paths are not repeated
self.paths: set[_LoadedInode] = set()
# Patterns to skip
self.skiplist: Sequence[str] = (
skiplist if skiplist is not None else tuple()
)
self.fully_loaded = False
if paths is None:
self.modules.update(sys.builtin_module_names)
paths = sys.path
self.find_iterator = self.find_all_modules(
Path(p).resolve() if p else Path.cwd() for p in paths
)
def module_matches(self, cw: str, prefix: str = "") -> set[str]:
"""Modules names to replace cw with"""
full = f"{prefix}.{cw}" if prefix else cw
matches = (
name
for name in self.modules
if (name.startswith(full) and name.find(".", len(full)) == -1)
)
if prefix:
return {match[len(prefix) + 1 :] for match in matches}
else:
return set(matches)
def attr_matches(
self, cw: str, prefix: str = "", only_modules: bool = False
) -> set[str]:
"""Attributes to replace name with"""
full = f"{prefix}.{cw}" if prefix else cw
module_name, _, name_after_dot = full.rpartition(".")
if module_name not in sys.modules:
return set()
module = sys.modules[module_name]
if only_modules:
matches = {
name
for name in dir(module)
if name.startswith(name_after_dot)
and f"{module_name}.{name}" in sys.modules
}
else:
matches = {
name for name in dir(module) if name.startswith(name_after_dot)
}
module_part = cw.rpartition(".")[0]
if module_part:
matches = {f"{module_part}.{m}" for m in matches}
return matches
def module_attr_matches(self, name: str) -> set[str]:
"""Only attributes which are modules to replace name with"""
return self.attr_matches(name, only_modules=True)
def complete(self, cursor_offset: int, line: str) -> set[str] | None:
"""Construct a full list of possibly completions for imports."""
tokens = line.split()
if "from" not in tokens and "import" not in tokens:
return None
result = current_word(cursor_offset, line)
if result is None:
return None
from_import_from = current_from_import_from(cursor_offset, line)
if from_import_from is not None:
import_import = current_from_import_import(cursor_offset, line)
if import_import is not None:
# `from a import <b|>` completion
matches = self.module_matches(
import_import.word, from_import_from.word
)
matches.update(
self.attr_matches(import_import.word, from_import_from.word)
)
else:
# `from <a|>` completion
matches = self.module_attr_matches(from_import_from.word)
matches.update(self.module_matches(from_import_from.word))
return matches
cur_import = current_import(cursor_offset, line)
if cur_import is not None:
# `import <a|>` completion
matches = self.module_matches(cur_import.word)
matches.update(self.module_attr_matches(cur_import.word))
return matches
else:
return None
def find_modules(self, path: Path) -> Generator[str | None, None, None]:
"""Find all modules (and packages) for a given directory."""
if not path.is_dir():
# Perhaps a zip file
return
if any(fnmatch.fnmatch(path.name, entry) for entry in self.skiplist):
# Path is on skiplist
return
finder = importlib.machinery.FileFinder(str(path), *LOADERS) # type: ignore
try:
for p in path.iterdir():
if p.name.startswith(".") or p.name == "__pycache__":
# Impossible to import from names starting with . and we can skip __pycache__
continue
elif any(
fnmatch.fnmatch(p.name, entry) for entry in self.skiplist
):
# Path is on skiplist
continue
elif not any(p.name.endswith(suffix) for suffix in SUFFIXES):
# Possibly a package
if "." in p.name:
continue
elif p.is_dir():
# Unfortunately, CPython just crashes if there is a directory
# which ends with a python extension, so work around.
continue
name = p.name
for suffix in SUFFIXES:
if name.endswith(suffix):
name = name[: -len(suffix)]
break
if name == "badsyntax_pep3120":
# Workaround for issue #166
continue
package_pathname = None
try:
with warnings.catch_warnings():
warnings.simplefilter("ignore", ImportWarning)
spec = finder.find_spec(name)
if spec is None:
continue
if spec.submodule_search_locations is not None:
package_pathname = spec.submodule_search_locations[
0
]
except (ImportError, OSError, SyntaxError, UnicodeEncodeError):
# UnicodeEncodeError happens with Python 3 when there is a filename in some invalid encoding
continue
if package_pathname is not None:
path_real = Path(package_pathname).resolve()
try:
stat = path_real.stat()
except OSError:
continue
loaded_inode = _LoadedInode(stat.st_dev, stat.st_ino)
if loaded_inode not in self.paths:
self.paths.add(loaded_inode)
for subname in self.find_modules(path_real):
if subname is None:
yield None # take a break to avoid unresponsiveness
elif subname != "__init__":
yield f"{name}.{subname}"
yield name
except OSError:
# Path is not readable
return
yield None # take a break to avoid unresponsiveness
def find_all_modules(
self, paths: Iterable[Path]
) -> Generator[None, None, None]:
"""Return a list with all modules in `path`, which should be a list of
directory names. If path is not given, sys.path will be used."""
for p in paths:
for module in self.find_modules(p):
if module is not None:
self.modules.add(module)
yield
def find_coroutine(self) -> bool:
if self.fully_loaded:
return False
try:
next(self.find_iterator)
except StopIteration:
self.fully_loaded = True
return True