557 lines
16 KiB
Python
557 lines
16 KiB
Python
from __future__ import absolute_import, unicode_literals
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import io
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import os
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import sys
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from collections import defaultdict
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from functools import partial
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from importlib import import_module
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from distutils.errors import DistutilsOptionError, DistutilsFileError
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from setuptools.extern.six import string_types
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def read_configuration(
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filepath, find_others=False, ignore_option_errors=False):
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"""Read given configuration file and returns options from it as a dict.
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:param str|unicode filepath: Path to configuration file
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to get options from.
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:param bool find_others: Whether to search for other configuration files
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which could be on in various places.
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:param bool ignore_option_errors: Whether to silently ignore
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options, values of which could not be resolved (e.g. due to exceptions
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in directives such as file:, attr:, etc.).
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If False exceptions are propagated as expected.
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:rtype: dict
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"""
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from setuptools.dist import Distribution, _Distribution
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filepath = os.path.abspath(filepath)
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if not os.path.isfile(filepath):
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raise DistutilsFileError(
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'Configuration file %s does not exist.' % filepath)
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current_directory = os.getcwd()
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os.chdir(os.path.dirname(filepath))
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try:
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dist = Distribution()
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filenames = dist.find_config_files() if find_others else []
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if filepath not in filenames:
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filenames.append(filepath)
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_Distribution.parse_config_files(dist, filenames=filenames)
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handlers = parse_configuration(
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dist, dist.command_options,
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ignore_option_errors=ignore_option_errors)
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finally:
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os.chdir(current_directory)
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return configuration_to_dict(handlers)
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def configuration_to_dict(handlers):
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"""Returns configuration data gathered by given handlers as a dict.
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:param list[ConfigHandler] handlers: Handlers list,
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usually from parse_configuration()
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:rtype: dict
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"""
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config_dict = defaultdict(dict)
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for handler in handlers:
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obj_alias = handler.section_prefix
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target_obj = handler.target_obj
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for option in handler.set_options:
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getter = getattr(target_obj, 'get_%s' % option, None)
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if getter is None:
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value = getattr(target_obj, option)
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else:
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value = getter()
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config_dict[obj_alias][option] = value
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return config_dict
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def parse_configuration(
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distribution, command_options, ignore_option_errors=False):
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"""Performs additional parsing of configuration options
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for a distribution.
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Returns a list of used option handlers.
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:param Distribution distribution:
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:param dict command_options:
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:param bool ignore_option_errors: Whether to silently ignore
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options, values of which could not be resolved (e.g. due to exceptions
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in directives such as file:, attr:, etc.).
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If False exceptions are propagated as expected.
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:rtype: list
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"""
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meta = ConfigMetadataHandler(
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distribution.metadata, command_options, ignore_option_errors)
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meta.parse()
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options = ConfigOptionsHandler(
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distribution, command_options, ignore_option_errors)
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options.parse()
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return meta, options
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class ConfigHandler(object):
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"""Handles metadata supplied in configuration files."""
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section_prefix = None
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"""Prefix for config sections handled by this handler.
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Must be provided by class heirs.
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"""
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aliases = {}
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"""Options aliases.
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For compatibility with various packages. E.g.: d2to1 and pbr.
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Note: `-` in keys is replaced with `_` by config parser.
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"""
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def __init__(self, target_obj, options, ignore_option_errors=False):
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sections = {}
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section_prefix = self.section_prefix
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for section_name, section_options in options.items():
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if not section_name.startswith(section_prefix):
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continue
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section_name = section_name.replace(section_prefix, '').strip('.')
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sections[section_name] = section_options
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self.ignore_option_errors = ignore_option_errors
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self.target_obj = target_obj
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self.sections = sections
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self.set_options = []
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@property
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def parsers(self):
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"""Metadata item name to parser function mapping."""
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raise NotImplementedError(
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'%s must provide .parsers property' % self.__class__.__name__)
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def __setitem__(self, option_name, value):
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unknown = tuple()
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target_obj = self.target_obj
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# Translate alias into real name.
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option_name = self.aliases.get(option_name, option_name)
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current_value = getattr(target_obj, option_name, unknown)
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if current_value is unknown:
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raise KeyError(option_name)
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if current_value:
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# Already inhabited. Skipping.
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return
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skip_option = False
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parser = self.parsers.get(option_name)
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if parser:
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try:
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value = parser(value)
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except Exception:
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skip_option = True
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if not self.ignore_option_errors:
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raise
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if skip_option:
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return
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setter = getattr(target_obj, 'set_%s' % option_name, None)
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if setter is None:
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setattr(target_obj, option_name, value)
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else:
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setter(value)
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self.set_options.append(option_name)
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@classmethod
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def _parse_list(cls, value, separator=','):
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"""Represents value as a list.
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Value is split either by separator (defaults to comma) or by lines.
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:param value:
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:param separator: List items separator character.
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:rtype: list
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"""
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if isinstance(value, list): # _get_parser_compound case
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return value
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if '\n' in value:
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value = value.splitlines()
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else:
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value = value.split(separator)
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return [chunk.strip() for chunk in value if chunk.strip()]
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@classmethod
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def _parse_dict(cls, value):
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"""Represents value as a dict.
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:param value:
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:rtype: dict
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"""
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separator = '='
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result = {}
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for line in cls._parse_list(value):
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key, sep, val = line.partition(separator)
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if sep != separator:
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raise DistutilsOptionError(
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'Unable to parse option value to dict: %s' % value)
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result[key.strip()] = val.strip()
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return result
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@classmethod
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def _parse_bool(cls, value):
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"""Represents value as boolean.
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:param value:
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:rtype: bool
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"""
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value = value.lower()
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return value in ('1', 'true', 'yes')
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@classmethod
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def _parse_file(cls, value):
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"""Represents value as a string, allowing including text
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from nearest files using `file:` directive.
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Directive is sandboxed and won't reach anything outside
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directory with setup.py.
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Examples:
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file: LICENSE
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file: README.rst, CHANGELOG.md, src/file.txt
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:param str value:
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:rtype: str
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"""
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include_directive = 'file:'
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if not isinstance(value, string_types):
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return value
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if not value.startswith(include_directive):
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return value
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spec = value[len(include_directive):]
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filepaths = (os.path.abspath(path.strip()) for path in spec.split(','))
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return '\n'.join(
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cls._read_file(path)
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for path in filepaths
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if (cls._assert_local(path) or True)
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and os.path.isfile(path)
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)
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@staticmethod
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def _assert_local(filepath):
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if not filepath.startswith(os.getcwd()):
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raise DistutilsOptionError(
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'`file:` directive can not access %s' % filepath)
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@staticmethod
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def _read_file(filepath):
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with io.open(filepath, encoding='utf-8') as f:
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return f.read()
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@classmethod
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def _parse_attr(cls, value):
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"""Represents value as a module attribute.
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Examples:
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attr: package.attr
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attr: package.module.attr
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:param str value:
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:rtype: str
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"""
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attr_directive = 'attr:'
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if not value.startswith(attr_directive):
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return value
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attrs_path = value.replace(attr_directive, '').strip().split('.')
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attr_name = attrs_path.pop()
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module_name = '.'.join(attrs_path)
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module_name = module_name or '__init__'
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sys.path.insert(0, os.getcwd())
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try:
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module = import_module(module_name)
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value = getattr(module, attr_name)
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finally:
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sys.path = sys.path[1:]
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return value
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@classmethod
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def _get_parser_compound(cls, *parse_methods):
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"""Returns parser function to represents value as a list.
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Parses a value applying given methods one after another.
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:param parse_methods:
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:rtype: callable
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"""
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def parse(value):
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parsed = value
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for method in parse_methods:
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parsed = method(parsed)
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return parsed
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return parse
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@classmethod
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def _parse_section_to_dict(cls, section_options, values_parser=None):
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"""Parses section options into a dictionary.
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Optionally applies a given parser to values.
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:param dict section_options:
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:param callable values_parser:
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:rtype: dict
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"""
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value = {}
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values_parser = values_parser or (lambda val: val)
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for key, (_, val) in section_options.items():
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value[key] = values_parser(val)
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return value
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def parse_section(self, section_options):
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"""Parses configuration file section.
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:param dict section_options:
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"""
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for (name, (_, value)) in section_options.items():
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try:
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self[name] = value
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except KeyError:
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pass # Keep silent for a new option may appear anytime.
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def parse(self):
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"""Parses configuration file items from one
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or more related sections.
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"""
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for section_name, section_options in self.sections.items():
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method_postfix = ''
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if section_name: # [section.option] variant
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method_postfix = '_%s' % section_name
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section_parser_method = getattr(
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self,
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# Dots in section names are tranlsated into dunderscores.
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('parse_section%s' % method_postfix).replace('.', '__'),
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None)
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if section_parser_method is None:
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raise DistutilsOptionError(
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'Unsupported distribution option section: [%s.%s]' % (
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self.section_prefix, section_name))
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section_parser_method(section_options)
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class ConfigMetadataHandler(ConfigHandler):
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section_prefix = 'metadata'
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aliases = {
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'home_page': 'url',
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'summary': 'description',
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'classifier': 'classifiers',
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'platform': 'platforms',
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}
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strict_mode = False
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"""We need to keep it loose, to be partially compatible with
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`pbr` and `d2to1` packages which also uses `metadata` section.
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"""
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@property
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def parsers(self):
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"""Metadata item name to parser function mapping."""
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parse_list = self._parse_list
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parse_file = self._parse_file
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parse_dict = self._parse_dict
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return {
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'platforms': parse_list,
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'keywords': parse_list,
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'provides': parse_list,
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'requires': parse_list,
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'obsoletes': parse_list,
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'classifiers': self._get_parser_compound(parse_file, parse_list),
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'license': parse_file,
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'description': parse_file,
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'long_description': parse_file,
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'version': self._parse_version,
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'project_urls': parse_dict,
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}
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def _parse_version(self, value):
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"""Parses `version` option value.
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:param value:
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:rtype: str
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"""
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version = self._parse_attr(value)
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if callable(version):
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version = version()
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if not isinstance(version, string_types):
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if hasattr(version, '__iter__'):
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version = '.'.join(map(str, version))
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else:
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version = '%s' % version
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return version
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class ConfigOptionsHandler(ConfigHandler):
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section_prefix = 'options'
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@property
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def parsers(self):
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"""Metadata item name to parser function mapping."""
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parse_list = self._parse_list
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parse_list_semicolon = partial(self._parse_list, separator=';')
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parse_bool = self._parse_bool
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parse_dict = self._parse_dict
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return {
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'zip_safe': parse_bool,
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'use_2to3': parse_bool,
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'include_package_data': parse_bool,
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'package_dir': parse_dict,
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'use_2to3_fixers': parse_list,
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'use_2to3_exclude_fixers': parse_list,
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'convert_2to3_doctests': parse_list,
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'scripts': parse_list,
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'eager_resources': parse_list,
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'dependency_links': parse_list,
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'namespace_packages': parse_list,
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'install_requires': parse_list_semicolon,
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'setup_requires': parse_list_semicolon,
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'tests_require': parse_list_semicolon,
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'packages': self._parse_packages,
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'entry_points': self._parse_file,
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'py_modules': parse_list,
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}
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def _parse_packages(self, value):
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"""Parses `packages` option value.
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:param value:
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:rtype: list
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"""
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find_directive = 'find:'
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if not value.startswith(find_directive):
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return self._parse_list(value)
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# Read function arguments from a dedicated section.
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find_kwargs = self.parse_section_packages__find(
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self.sections.get('packages.find', {}))
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from setuptools import find_packages
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return find_packages(**find_kwargs)
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def parse_section_packages__find(self, section_options):
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"""Parses `packages.find` configuration file section.
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To be used in conjunction with _parse_packages().
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:param dict section_options:
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"""
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section_data = self._parse_section_to_dict(
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section_options, self._parse_list)
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valid_keys = ['where', 'include', 'exclude']
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find_kwargs = dict(
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[(k, v) for k, v in section_data.items() if k in valid_keys and v])
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where = find_kwargs.get('where')
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if where is not None:
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find_kwargs['where'] = where[0] # cast list to single val
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return find_kwargs
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def parse_section_entry_points(self, section_options):
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"""Parses `entry_points` configuration file section.
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:param dict section_options:
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"""
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parsed = self._parse_section_to_dict(section_options, self._parse_list)
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self['entry_points'] = parsed
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def _parse_package_data(self, section_options):
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parsed = self._parse_section_to_dict(section_options, self._parse_list)
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root = parsed.get('*')
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if root:
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parsed[''] = root
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del parsed['*']
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return parsed
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def parse_section_package_data(self, section_options):
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"""Parses `package_data` configuration file section.
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:param dict section_options:
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"""
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self['package_data'] = self._parse_package_data(section_options)
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def parse_section_exclude_package_data(self, section_options):
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"""Parses `exclude_package_data` configuration file section.
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:param dict section_options:
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"""
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self['exclude_package_data'] = self._parse_package_data(
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section_options)
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def parse_section_extras_require(self, section_options):
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"""Parses `extras_require` configuration file section.
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:param dict section_options:
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"""
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parse_list = partial(self._parse_list, separator=';')
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self['extras_require'] = self._parse_section_to_dict(
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section_options, parse_list)
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