import ast
import io
import os
import sys
import warnings
import functools
import importlib
from collections import defaultdict
from functools import partial
from functools import wraps
from glob import iglob
import contextlib
from distutils.errors import DistutilsOptionError, DistutilsFileError
from setuptools.extern.packaging.version import LegacyVersion, parse
from setuptools.extern.packaging.specifiers import SpecifierSet
class StaticModule:
"""
Attempt to load the module by the name
"""
def __init__(self, name):
spec = importlib.util.find_spec(name)
with open(spec.origin) as strm:
src = strm.read()
module = ast.parse(src)
vars(self).update(locals())
del self.self
def __getattr__(self, attr):
try:
return next(
ast.literal_eval(statement.value)
for statement in self.module.body
if isinstance(statement, ast.Assign)
for target in statement.targets
if isinstance(target, ast.Name) and target.id == attr
)
except Exception as e:
raise AttributeError(
"{self.name} has no attribute {attr}".format(**locals())
) from e
@contextlib.contextmanager
def patch_path(path):
"""
Add path to front of sys.path for the duration of the context.
"""
try:
sys.path.insert(0, path)
yield
finally:
sys.path.remove(path)
def read_configuration(filepath, find_others=False, ignore_option_errors=False):
"""Read given configuration file and returns options from it as a dict.
:param str|unicode filepath: Path to configuration file
to get options from.
:param bool find_others: Whether to search for other configuration files
which could be on in various places.
:param bool ignore_option_errors: Whether to silently ignore
options, values of which could not be resolved (e.g. due to exceptions
in directives such as file:, attr:, etc.).
If False exceptions are propagated as expected.
:rtype: dict
"""
from setuptools.dist import Distribution, _Distribution
filepath = os.path.abspath(filepath)
if not os.path.isfile(filepath):
raise DistutilsFileError('Configuration file %s does not exist.' % filepath)
current_directory = os.getcwd()
os.chdir(os.path.dirname(filepath))
try:
dist = Distribution()
filenames = dist.find_config_files() if find_others else []
if filepath not in filenames:
filenames.append(filepath)
_Distribution.parse_config_files(dist, filenames=filenames)
handlers = parse_configuration(
dist, dist.command_options, ignore_option_errors=ignore_option_errors
)
finally:
os.chdir(current_directory)
return configuration_to_dict(handlers)
def _get_option(target_obj, key):
"""
Given a target object and option key, get that option from
the target object, either through a get_{key} method or
from an attribute directly.
"""
getter_name = 'get_{key}'.format(**locals())
by_attribute = functools.partial(getattr, target_obj, key)
getter = getattr(target_obj, getter_name, by_attribute)
return getter()
def configuration_to_dict(handlers):
"""Returns configuration data gathered by given handlers as a dict.
:param list[ConfigHandler] handlers: Handlers list,
usually from parse_configuration()
:rtype: dict
"""
config_dict = defaultdict(dict)
for handler in handlers:
for option in handler.set_options:
value = _get_option(handler.target_obj, option)
config_dict[handler.section_prefix][option] = value
return config_dict
def parse_configuration(distribution, command_options, ignore_option_errors=False):
"""Performs additional parsing of configuration options
for a distribution.
Returns a list of used option handlers.
:param Distribution distribution:
:param dict command_options:
:param bool ignore_option_errors: Whether to silently ignore
options, values of which could not be resolved (e.g. due to exceptions
in directives such as file:, attr:, etc.).
If False exceptions are propagated as expected.
:rtype: list
"""
options = ConfigOptionsHandler(distribution, command_options, ignore_option_errors)
options.parse()
meta = ConfigMetadataHandler(
distribution.metadata,
command_options,
ignore_option_errors,
distribution.package_dir,
)
meta.parse()
return meta, options
class ConfigHandler:
"""Handles metadata supplied in configuration files."""
section_prefix = None
"""Prefix for config sections handled by this handler.
Must be provided by class heirs.
"""
aliases = {}
"""Options aliases.
For compatibility with various packages. E.g.: d2to1 and pbr.
Note: `-` in keys is replaced with `_` by config parser.
"""
def __init__(self, target_obj, options, ignore_option_errors=False):
sections = {}
section_prefix = self.section_prefix
for section_name, section_options in options.items():
if not section_name.startswith(section_prefix):
continue
section_name = section_name.replace(section_prefix, '').strip('.')
sections[section_name] = section_options
self.ignore_option_errors = ignore_option_errors
self.target_obj = target_obj
self.sections = sections
self.set_options = []
@property
def parsers(self):
"""Metadata item name to parser function mapping."""
raise NotImplementedError(
'%s must provide .parsers property' % self.__class__.__name__
)
def __setitem__(self, option_name, value):
unknown = tuple()
target_obj = self.target_obj
# Translate alias into real name.
option_name = self.aliases.get(option_name, option_name)
current_value = getattr(target_obj, option_name, unknown)
if current_value is unknown:
raise KeyError(option_name)
if current_value:
# Already inhabited. Skipping.
return
skip_option = False
parser = self.parsers.get(option_name)
if parser:
try:
value = parser(value)
except Exception:
skip_option = True
if not self.ignore_option_errors:
raise
if skip_option:
return
setter = getattr(target_obj, 'set_%s' % option_name, None)
if setter is None:
setattr(target_obj, option_name, value)
else:
setter(value)
self.set_options.append(option_name)
@classmethod
def _parse_list(cls, value, separator=','):
"""Represents value as a list.
Value is split either by separator (defaults to comma) or by lines.
:param value:
:param separator: List items separator character.
:rtype: list
"""
if isinstance(value, list): # _get_parser_compound case
return value
if '\n' in value:
value = value.splitlines()
else:
value = value.split(separator)
return [chunk.strip() for chunk in value if chunk.strip()]
@classmethod
def _parse_list_glob(cls, value, separator=','):
"""Equivalent to _parse_list() but expands any glob patterns using glob().
However, unlike with glob() calls, the results remain relative paths.
:param value:
:param separator: List items separator character.
:rtype: list
"""
glob_characters = ('*', '?', '[', ']', '{', '}')
values = cls._parse_list(value, separator=separator)
expanded_values = []
for value in values:
# Has globby characters?
if any(char in value for char in glob_characters):
# then expand the glob pattern while keeping paths *relative*:
expanded_values.extend(sorted(
os.path.relpath(path, os.getcwd())
for path in iglob(os.path.abspath(value))))
else:
# take the value as-is:
expanded_values.append(value)
return expanded_values
@classmethod
def _parse_dict(cls, value):
"""Represents value as a dict.
:param value:
:rtype: dict
"""
separator = '='
result = {}
for line in cls._parse_list(value):
key, sep, val = line.partition(separator)
if sep != separator:
raise DistutilsOptionError(
'Unable to parse option value to dict: %s' % value
)
result[key.strip()] = val.strip()
return result
@classmethod
def _parse_bool(cls, value):
"""Represents value as boolean.
:param value:
:rtype: bool
"""
value = value.lower()
return value in ('1', 'true', 'yes')
@classmethod
def _exclude_files_parser(cls, key):
"""Returns a parser function to make sure field inputs
are not files.
Parses a value after getting the key so error messages are
more informative.
:param key:
:rtype: callable
"""
def parser(value):
exclude_directive = 'file:'
if value.startswith(exclude_directive):
raise ValueError(
'Only strings are accepted for the {0} field, '
'files are not accepted'.format(key)
)
return value
return parser
@classmethod
def _parse_file(cls, value):
"""Represents value as a string, allowing including text
from nearest files using `file:` directive.
Directive is sandboxed and won't reach anything outside
directory with setup.py.
Examples:
file: README.rst, CHANGELOG.md, src/file.txt
:param str value:
:rtype: str
"""
include_directive = 'file:'
if not isinstance(value, str):
return value
if not value.startswith(include_directive):
return value
spec = value[len(include_directive) :]
filepaths = (os.path.abspath(path.strip()) for path in spec.split(','))
return '\n'.join(
cls._read_file(path)
for path in filepaths
if (cls._assert_local(path) or True) and os.path.isfile(path)
)
@staticmethod
def _assert_local(filepath):
if not filepath.startswith(os.getcwd()):
raise DistutilsOptionError('`file:` directive can not access %s' % filepath)
@staticmethod
def _read_file(filepath):
with io.open(filepath, encoding='utf-8') as f:
return f.read()
@classmethod
def _parse_attr(cls, value, package_dir=None):
"""Represents value as a module attribute.
Examples:
attr: package.attr
attr: package.module.attr
:param str value:
:rtype: str
"""
attr_directive = 'attr:'
if not value.startswith(attr_directive):
return value
attrs_path = value.replace(attr_directive, '').strip().split('.')
attr_name = attrs_path.pop()
module_name = '.'.join(attrs_path)
module_name = module_name or '__init__'
parent_path = os.getcwd()
if package_dir:
if attrs_path[0] in package_dir:
# A custom path was specified for the module we want to import
custom_path = package_dir[attrs_path[0]]
parts = custom_path.rsplit('/', 1)
if len(parts) > 1:
parent_path = os.path.join(os.getcwd(), parts[0])
module_name = parts[1]
else:
module_name = custom_path
elif '' in package_dir:
# A custom parent directory was specified for all root modules
parent_path = os.path.join(os.getcwd(), package_dir[''])
with patch_path(parent_path):
try:
# attempt to load value statically
return getattr(StaticModule(module_name), attr_name)
except Exception:
# fallback to simple import
module = importlib.import_module(module_name)
return getattr(module, attr_name)
@classmethod
def _get_parser_compound(cls, *parse_methods):
"""Returns parser function to represents value as a list.
Parses a value applying given methods one after another.
:param parse_methods:
:rtype: callable
"""
def parse(value):
parsed = value
for method in parse_methods:
parsed = method(parsed)
return parsed
return parse
@classmethod
def _parse_section_to_dict(cls, section_options, values_parser=None):
"""Parses section options into a dictionary.
Optionally applies a given parser to values.
:param dict section_options:
:param callable values_parser:
:rtype: dict
"""
value = {}
values_parser = values_parser or (lambda val: val)
for key, (_, val) in section_options.items():
value[key] = values_parser(val)
return value
def parse_section(self, section_options):
"""Parses configuration file section.
:param dict section_options:
"""
for (name, (_, value)) in section_options.items():
try:
self[name] = value
except KeyError:
pass # Keep silent for a new option may appear anytime.
def parse(self):
"""Parses configuration file items from one
or more related sections.
"""
for section_name, section_options in self.sections.items():
method_postfix = ''
if section_name: # [section.option] variant
method_postfix = '_%s' % section_name
section_parser_method = getattr(
self,
# Dots in section names are translated into dunderscores.
('parse_section%s' % method_postfix).replace('.', '__'),
None,
)
if section_parser_method is None:
raise DistutilsOptionError(
'Unsupported distribution option section: [%s.%s]'
% (self.section_prefix, section_name)
)
section_parser_method(section_options)
def _deprecated_config_handler(self, func, msg, warning_class):
"""this function will wrap around parameters that are deprecated
:param msg: deprecation message
:param warning_class: class of warning exception to be raised
:param func: function to be wrapped around
"""
@wraps(func)
def config_handler(*args, **kwargs):
warnings.warn(msg, warning_class)
return func(*args, **kwargs)
return config_handler
class ConfigMetadataHandler(ConfigHandler):
section_prefix = 'metadata'
aliases = {
'home_page': 'url',
'summary': 'description',
'classifier': 'classifiers',
'platform': 'platforms',
}
strict_mode = False
"""We need to keep it loose, to be partially compatible with
`pbr` and `d2to1` packages which also uses `metadata` section.
"""
def __init__(
self, target_obj, options, ignore_option_errors=False, package_dir=None
):
super(ConfigMetadataHandler, self).__init__(
target_obj, options, ignore_option_errors
)
self.package_dir = package_dir
@property
def parsers(self):
"""Metadata item name to parser function mapping."""
parse_list = self._parse_list
parse_file = self._parse_file
parse_dict = self._parse_dict
exclude_files_parser = self._exclude_files_parser
return {
'platforms': parse_list,
'keywords': parse_list,
'provides': parse_list,
'requires': self._deprecated_config_handler(
parse_list,
"The requires parameter is deprecated, please use "
"install_requires for runtime dependencies.",
DeprecationWarning,
),
'obsoletes': parse_list,
'classifiers': self._get_parser_compound(parse_file, parse_list),
'license': exclude_files_parser('license'),
'license_file': self._deprecated_config_handler(
exclude_files_parser('license_file'),
"The license_file parameter is deprecated, "
"use license_files instead.",
DeprecationWarning,
),
'license_files': parse_list,
'description': parse_file,
'long_description': parse_file,
'version': self._parse_version,
'project_urls': parse_dict,
}
def _parse_version(self, value):
"""Parses `version` option value.
:param value:
:rtype: str
"""
version = self._parse_file(value)
if version != value:
version = version.strip()
# Be strict about versions loaded from file because it's easy to
# accidentally include newlines and other unintended content
if isinstance(parse(version), LegacyVersion):
tmpl = (
'Version loaded from {value} does not '
'comply with PEP 440: {version}'
)
raise DistutilsOptionError(tmpl.format(**locals()))
return version
version = self._parse_attr(value, self.package_dir)
if callable(version):
version = version()
if not isinstance(version, str):
if hasattr(version, '__iter__'):
version = '.'.join(map(str, version))
else:
version = '%s' % version
return version
class ConfigOptionsHandler(ConfigHandler):
section_prefix = 'options'
@property
def parsers(self):
"""Metadata item name to parser function mapping."""
parse_list = self._parse_list
parse_list_semicolon = partial(self._parse_list, separator=';')
parse_bool = self._parse_bool
parse_dict = self._parse_dict
parse_cmdclass = self._parse_cmdclass
return {
'zip_safe': parse_bool,
'include_package_data': parse_bool,
'package_dir': parse_dict,
'scripts': parse_list,
'eager_resources': parse_list,
'dependency_links': parse_list,
'namespace_packages': parse_list,
'install_requires': parse_list_semicolon,
'setup_requires': parse_list_semicolon,
'tests_require': parse_list_semicolon,
'packages': self._parse_packages,
'entry_points': self._parse_file,
'py_modules': parse_list,
'python_requires': SpecifierSet,
'cmdclass': parse_cmdclass,
}
def _parse_cmdclass(self, value):
def resolve_class(qualified_class_name):
idx = qualified_class_name.rfind('.')
class_name = qualified_class_name[idx + 1 :]
pkg_name = qualified_class_name[:idx]
module = __import__(pkg_name)
return getattr(module, class_name)
return {k: resolve_class(v) for k, v in self._parse_dict(value).items()}
def _parse_packages(self, value):
"""Parses `packages` option value.
:param value:
:rtype: list
"""
find_directives = ['find:', 'find_namespace:']
trimmed_value = value.strip()
if trimmed_value not in find_directives:
return self._parse_list(value)
findns = trimmed_value == find_directives[1]
# Read function arguments from a dedicated section.
find_kwargs = self.parse_section_packages__find(
self.sections.get('packages.find', {})
)
if findns:
from setuptools import find_namespace_packages as find_packages
else:
from setuptools import find_packages
return find_packages(**find_kwargs)
def parse_section_packages__find(self, section_options):
"""Parses `packages.find` configuration file section.
To be used in conjunction with _parse_packages().
:param dict section_options:
"""
section_data = self._parse_section_to_dict(section_options, self._parse_list)
valid_keys = ['where', 'include', 'exclude']
find_kwargs = dict(
[(k, v) for k, v in section_data.items() if k in valid_keys and v]
)
where = find_kwargs.get('where')
if where is not None:
find_kwargs['where'] = where[0] # cast list to single val
return find_kwargs
def parse_section_entry_points(self, section_options):
"""Parses `entry_points` configuration file section.
:param dict section_options:
"""
parsed = self._parse_section_to_dict(section_options, self._parse_list)
self['entry_points'] = parsed
def _parse_package_data(self, section_options):
parsed = self._parse_section_to_dict(section_options, self._parse_list)
root = parsed.get('*')
if root:
parsed[''] = root
del parsed['*']
return parsed
def parse_section_package_data(self, section_options):
"""Parses `package_data` configuration file section.
:param dict section_options:
"""
self['package_data'] = self._parse_package_data(section_options)
def parse_section_exclude_package_data(self, section_options):
"""Parses `exclude_package_data` configuration file section.
:param dict section_options:
"""
self['exclude_package_data'] = self._parse_package_data(section_options)
def parse_section_extras_require(self, section_options):
"""Parses `extras_require` configuration file section.
:param dict section_options:
"""
parse_list = partial(self._parse_list, separator=';')
self['extras_require'] = self._parse_section_to_dict(
section_options, parse_list
)
def parse_section_data_files(self, section_options):
"""Parses `data_files` configuration file section.
:param dict section_options:
"""
parsed = self._parse_section_to_dict(section_options, self._parse_list_glob)
self['data_files'] = [(k, v) for k, v in parsed.items()]
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