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config.py
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from __future__ import absolute_import, unicode_literals import io import os import sys from collections import defaultdict from functools import partial from importlib import import_module from distutils.errors import DistutilsOptionError, DistutilsFileError from setuptools.extern.six import string_types 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 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: obj_alias = handler.section_prefix target_obj = handler.target_obj for option in handler.set_options: getter = getattr(target_obj, 'get_%s' % option, None) if getter is None: value = getattr(target_obj, option) else: value = getter() config_dict[obj_alias][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 """ meta = ConfigMetadataHandler( distribution.metadata, command_options, ignore_option_errors) meta.parse() options = ConfigOptionsHandler( distribution, command_options, ignore_option_errors) options.parse() return meta, options class ConfigHandler(object): """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 _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: LICENSE file: README.rst, CHANGELOG.md, src/file.txt :param str value: :rtype: str """ include_directive = 'file:' if not isinstance(value, string_types): 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): """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__' sys.path.insert(0, os.getcwd()) try: module = import_module(module_name) value = getattr(module, attr_name) finally: sys.path = sys.path[1:] return value @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 tranlsated 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) 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. """ @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 return { 'platforms': parse_list, 'keywords': parse_list, 'provides': parse_list, 'requires': parse_list, 'obsoletes': parse_list, 'classifiers': self._get_parser_compound(parse_file, parse_list), 'license': parse_file, '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_attr(value) if callable(version): version = version() if not isinstance(version, string_types): 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, } def _parse_packages(self, value): """Parses `packages` option value. :param value: :rtype: list """ find_directive = 'find:' if not value.startswith(find_directive): return self._parse_list(value) # Read function arguments from a dedicated section. find_kwargs = self.parse_section_packages__find( self.sections.get('packages.find', {})) 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)