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74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
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"""Defines any IO utilities used by isort"""
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import re
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import tokenize
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from contextlib import contextmanager
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from io import BytesIO, StringIO, TextIOWrapper
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from pathlib import Path
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from typing import Callable, Iterator, TextIO, Union
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from isort._future import dataclass
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from isort.exceptions import UnsupportedEncoding
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_ENCODING_PATTERN = re.compile(br"^[ \t\f]*#.*?coding[:=][ \t]*([-_.a-zA-Z0-9]+)")
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@dataclass(frozen=True)
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class File:
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stream: TextIO
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path: Path
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encoding: str
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@staticmethod
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def detect_encoding(filename: str, readline: Callable[[], bytes]):
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try:
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return tokenize.detect_encoding(readline)[0]
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except Exception:
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raise UnsupportedEncoding(filename)
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@staticmethod
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def from_contents(contents: str, filename: str) -> "File":
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encoding = File.detect_encoding(filename, BytesIO(contents.encode("utf-8")).readline)
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return File( # type: ignore
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stream=StringIO(contents), path=Path(filename).resolve(), encoding=encoding
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)
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@property
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def extension(self):
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return self.path.suffix.lstrip(".")
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@staticmethod
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def _open(filename):
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"""Open a file in read only mode using the encoding detected by
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detect_encoding().
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"""
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buffer = open(filename, "rb")
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try:
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encoding = File.detect_encoding(filename, buffer.readline)
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buffer.seek(0)
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text = TextIOWrapper(buffer, encoding, line_buffering=True, newline="")
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text.mode = "r" # type: ignore
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return text
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except Exception:
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buffer.close()
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raise
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@staticmethod
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@contextmanager
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def read(filename: Union[str, Path]) -> Iterator["File"]:
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file_path = Path(filename).resolve()
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stream = None
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try:
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stream = File._open(file_path)
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yield File(stream=stream, path=file_path, encoding=stream.encoding) # type: ignore
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finally:
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if stream is not None:
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stream.close()
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class _EmptyIO(StringIO):
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def write(self, *args, **kwargs):
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pass
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Empty = _EmptyIO()
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