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100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
#
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# Copyright (C) 2018 Satoru SATOH <ssato @ redhat.com>
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# License: MIT
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#
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# pylint: disable=invalid-name
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r"""Functions for value objects represent inputs and outputs.
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.. versionadded:: 0.9.5
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- Add functions to make and process input and output object holding some
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attributes like input and output type (path, stream or pathlib.Path object),
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path, opener, etc.
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"""
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from __future__ import absolute_import
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import anyconfig.utils
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from anyconfig.globals import (
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IOInfo, IOI_NONE, IOI_PATH_STR, IOI_PATH_OBJ, IOI_STREAM,
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UnknownFileTypeError
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)
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def guess_io_type(obj):
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"""Guess input or output type of ``obj``.
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:param obj: a path string, a pathlib.Path or a file / file-like object
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:return: IOInfo type defined in anyconfig.globals.IOI_TYPES
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>>> apath = "/path/to/a_conf.ext"
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>>> assert guess_io_type(apath) == IOI_PATH_STR
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>>> from anyconfig.compat import pathlib
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>>> if pathlib is not None:
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... assert guess_io_type(pathlib.Path(apath)) == IOI_PATH_OBJ
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>>> assert guess_io_type(open(__file__)) == IOI_STREAM
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"""
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if obj is None:
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return IOI_NONE
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if anyconfig.utils.is_path(obj):
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return IOI_PATH_STR
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if anyconfig.utils.is_path_obj(obj):
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return IOI_PATH_OBJ
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return IOI_STREAM
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def inspect_io_obj(obj):
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"""
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:param obj: a path string, a pathlib.Path or a file / file-like object
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:return: A tuple of (objtype, objpath, objopener)
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:raises: UnknownFileTypeError
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"""
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itype = guess_io_type(obj)
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if itype == IOI_PATH_STR:
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ipath = anyconfig.utils.normpath(obj)
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ext = anyconfig.utils.get_file_extension(ipath)
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opener = open
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elif itype == IOI_PATH_OBJ:
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ipath = anyconfig.utils.normpath(obj.as_posix())
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ext = anyconfig.utils.get_file_extension(ipath)
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opener = obj.open
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elif itype == IOI_STREAM:
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ipath = anyconfig.utils.get_path_from_stream(obj)
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ext = anyconfig.utils.get_file_extension(ipath) if ipath else None
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opener = anyconfig.utils.noop
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elif itype == IOI_NONE:
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ipath = ext = None
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opener = anyconfig.utils.noop
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else:
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raise UnknownFileTypeError("%r" % obj)
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return (itype, ipath, opener, ext)
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def make(obj, forced_type=None):
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"""
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:param obj: a path string, a pathlib.Path or a file / file-like object
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:param prs: A list of processor classes
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:param forced_type: Forced processor type or processor object
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:return:
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Namedtuple object represents a kind of input object such as a file /
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file-like object, path string or pathlib.Path object
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:raises: ValueError, UnknownProcessorTypeError, UnknownFileTypeError
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"""
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if anyconfig.utils.is_ioinfo(obj):
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return obj
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if (obj is None or not obj) and forced_type is None:
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raise ValueError("obj or forced_type must be some value")
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(itype, ipath, opener, ext) = inspect_io_obj(obj)
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return IOInfo(src=obj, type=itype, path=ipath, opener=opener,
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extension=ext)
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# vim:sw=4:ts=4:et:
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