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# Copyright (C) 2011 - 2018 Satoru SATOH <ssato @ redhat.com> |
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# License: MIT |
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# |
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# Suppress: |
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# - false-positive warn at '... pkg_resources ...' line |
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# - import positions after some globals are defined |
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# pylint: disable=no-member,wrong-import-position |
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"""A module to aggregate config parser (loader/dumper) backends. |
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""" |
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from __future__ import absolute_import |
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import logging |
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import anyconfig.compat |
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import anyconfig.ioinfo |
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import anyconfig.processors |
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import anyconfig.utils |
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import anyconfig.backend.base |
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import anyconfig.backend.ini |
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import anyconfig.backend.json |
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import anyconfig.backend.pickle |
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import anyconfig.backend.properties |
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import anyconfig.backend.shellvars |
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import anyconfig.backend.xml |
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LOGGER = logging.getLogger(__name__) |
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PARSERS = [anyconfig.backend.ini.Parser, anyconfig.backend.json.Parser, |
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anyconfig.backend.pickle.Parser, |
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anyconfig.backend.properties.Parser, |
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anyconfig.backend.shellvars.Parser, anyconfig.backend.xml.Parser] |
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_NA_MSG = "%s is not available. Disabled %s support." |
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try: |
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import anyconfig.backend.yaml |
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PARSERS.append(anyconfig.backend.yaml.Parser) |
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except ImportError: |
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LOGGER.info(_NA_MSG, "yaml module", "YAML") |
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try: |
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import anyconfig.backend.configobj |
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PARSERS.append(anyconfig.backend.configobj.Parser) |
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except ImportError: |
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LOGGER.info(_NA_MSG, "ConfigObj module", "its") |
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try: |
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import anyconfig.backend.toml |
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PARSERS.append(anyconfig.backend.toml.Parser) |
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except ImportError: |
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LOGGER.info(_NA_MSG, "toml module", "TOML") |
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PARSERS.extend(anyconfig.processors.load_plugins("anyconfig_backends")) |
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_PARSERS_BY_TYPE = tuple(anyconfig.processors.list_processors_by_type(PARSERS)) |
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_PARSERS_BY_EXT = tuple(anyconfig.processors.list_processors_by_ext(PARSERS)) |
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def is_parser(obj): |
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""" |
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:return: True if given `obj` is an instance of parser. |
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>>> is_parser("ini") |
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False |
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>>> is_parser(anyconfig.backend.base.Parser) |
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False |
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>>> is_parser(anyconfig.backend.base.Parser()) |
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True |
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""" |
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return isinstance(obj, anyconfig.backend.base.Parser) |
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def inspect_io_obj(obj, cps_by_ext=_PARSERS_BY_EXT, |
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cps_by_type=_PARSERS_BY_TYPE, forced_type=None): |
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""" |
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Inspect a given object `obj` which may be a path string, file / file-like |
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object, pathlib.Path object or `~anyconfig.globals.IOInfo` namedtuple |
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object, and find out appropriate parser object to load or dump from/to it |
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along with other I/O information. |
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:param obj: |
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a file path string, file / file-like object, pathlib.Path object or |
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`~anyconfig.globals.IOInfo` object |
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:param forced_type: Forced type of parser to load or dump |
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:return: anyconfig.globals.IOInfo object :: namedtuple |
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:raises: ValueError, UnknownParserTypeError, UnknownFileTypeError |
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""" |
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return anyconfig.ioinfo.make(obj, cps_by_ext, cps_by_type, |
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forced_type=forced_type) |
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def find_parser_by_type(forced_type, cps_by_ext=_PARSERS_BY_EXT, |
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cps_by_type=_PARSERS_BY_TYPE): |
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""" |
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Find out appropriate parser object to load inputs of given type. |
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:param forced_type: Forced parser type |
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:param cps_by_type: A list of pairs (parser_type, [parser_class]) |
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:return: |
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An instance of :class:`~anyconfig.backend.base.Parser` or None means no |
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appropriate parser was found |
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:raises: UnknownParserTypeError |
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""" |
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if forced_type is None or not forced_type: |
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raise ValueError("forced_type must be a some string") |
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return anyconfig.ioinfo.find_parser(None, cps_by_ext=cps_by_ext, |
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cps_by_type=cps_by_type, |
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forced_type=forced_type) |
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def find_parser(obj, forced_type=None): |
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""" |
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Find out appropriate parser object to load from a file of given path or |
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file/file-like object. |
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:param obj: |
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a file path string, file / file-like object, pathlib.Path object or |
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`~anyconfig.globals.IOInfo` object |
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:param forced_type: Forced configuration parser type |
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:return: A tuple of (Parser class or None, "" or error message) |
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:raises: ValueError, UnknownParserTypeError, UnknownFileTypeError |
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""" |
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if anyconfig.utils.is_ioinfo(obj): |
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return obj.parser # It must have this. |
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ioi = inspect_io_obj(obj, _PARSERS_BY_EXT, _PARSERS_BY_TYPE, forced_type) |
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psr = ioi.parser |
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LOGGER.debug("Using parser %r [%s] for input type %s", |
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psr, psr.type(), ioi.type) |
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return psr |
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def list_types(cps=_PARSERS_BY_TYPE): |
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"""List available config types. |
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""" |
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return anyconfig.processors.list_types(cps) |
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# vim:sw=4:ts=4:et: |
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ssato /
python-anyconfig
