mirror of https://github.com/python/cpython
65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
import contextlib
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import os.path
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def resolve(source, filename):
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if _looks_like_filename(source):
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return _resolve_filename(source, filename)
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if isinstance(source, str):
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source = source.splitlines()
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# At this point "source" is not a str.
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if not filename:
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filename = None
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elif not isinstance(filename, str):
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raise TypeError(f'filename should be str (or None), got {filename!r}')
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else:
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filename, _ = _resolve_filename(filename)
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return source, filename
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@contextlib.contextmanager
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def good_file(filename, alt=None):
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if not _looks_like_filename(filename):
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raise ValueError(f'expected a filename, got {filename}')
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filename, _ = _resolve_filename(filename, alt)
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try:
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yield filename
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except Exception:
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if not os.path.exists(filename):
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raise FileNotFoundError(f'file not found: {filename}')
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raise # re-raise
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def _looks_like_filename(value):
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if not isinstance(value, str):
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return False
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return value.endswith(('.c', '.h'))
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def _resolve_filename(filename, alt=None):
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if os.path.isabs(filename):
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...
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# raise NotImplementedError
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else:
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filename = os.path.join('.', filename)
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if not alt:
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alt = filename
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elif os.path.abspath(filename) == os.path.abspath(alt):
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alt = filename
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else:
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raise ValueError(f'mismatch: {filename} != {alt}')
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return filename, alt
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@contextlib.contextmanager
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def opened(source, filename=None):
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source, filename = resolve(source, filename)
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if isinstance(source, str):
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with open(source) as srcfile:
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yield srcfile, filename
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else:
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yield source, filename
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