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config.py
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 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_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 return { 'zip_safe': parse_bool, 'use_2to3': parse_bool, 'include_package_data': parse_bool, 'package_dir': parse_dict, 'use_2to3_fixers': parse_list, 'use_2to3_exclude_fixers': parse_list, 'convert_2to3_doctests': parse_list, '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, } 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) self['data_files'] = [(k, v) for k, v in parsed.items()]
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