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import os
import re
import warnings
from pathlib import Path
from requirements_detector import find_requirements
from requirements_detector.detect import RequirementsNotFound
from prospector import encoding
from prospector.exceptions import PermissionMissing
from prospector.pathutils import is_virtualenv
POSSIBLE_LIBRARIES = ("django", "celery", "flask")
# see http://docs.python.org/2/reference/lexical_analysis.html#identifiers
_FROM_IMPORT_REGEX = re.compile(r"^\s*from ([\._a-zA-Z0-9]+) import .*$")
_IMPORT_REGEX = re.compile(r"^\s*import ([\._a-zA-Z0-9]+)$")
_IMPORT_MULTIPLE_REGEX = re.compile(r"^\s*import ([\._a-zA-Z0-9]+(, ){1})+")
def find_from_imports(file_contents):
names = set()
for line in file_contents.split("\n"):
match = _IMPORT_MULTIPLE_REGEX.match(line)
if match:
import_names = []
first = match.group(1)
import_names.append(first[:-2])
for name in line.split(first)[1].split(","):
import_names.append(name.strip())
else:
match = _IMPORT_REGEX.match(line) or _FROM_IMPORT_REGEX.match(line)
if match is None:
continue
import_names = match.group(1).split(".")
for import_name in import_names:
if import_name in POSSIBLE_LIBRARIES:
names.add(import_name)
return names
def find_from_path(path: Path):
names = set()
try:
for item in path.iterdir():
if item.is_dir():
if is_virtualenv(item):
continue
names |= find_from_path(item)
elif not item.is_symlink() and item.suffix == ".py":
try:
contents = encoding.read_py_file(item)
names |= find_from_imports(contents)
except encoding.CouldNotHandleEncoding as err:
# TODO: this output will break output formats such as JSON
warnings.warn(f"{err.path}: {err.__cause__}", ImportWarning)
if len(names) == len(POSSIBLE_LIBRARIES):
# don't continue on recursing, there's no point!
break
except PermissionError as err:
raise PermissionMissing(path) from err
return names
def find_from_requirements(path):
reqs = find_requirements(path)
names = []
for requirement in reqs:
if requirement.name is not None and requirement.name.lower() in POSSIBLE_LIBRARIES:
names.append(requirement.name.lower())
return names
def autodetect_libraries(path):
if os.path.isfile(path):
path = os.path.dirname(path)
if path == "":
path = "."
libraries = []
try:
libraries = find_from_requirements(path)
except RequirementsNotFound:
pass
if len(libraries) < len(POSSIBLE_LIBRARIES):
libraries = find_from_path(path)
return libraries