Viewing file:  source.py (1.68 KB) -rw-r--r--
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import contextlib
import os.path
def resolve(source, filename):
if _looks_like_filename(source):
return _resolve_filename(source, filename)
if isinstance(source, str):
source = source.splitlines()
# At this point "source" is not a str.
if not filename:
filename = None
elif not isinstance(filename, str):
raise TypeError(f'filename should be str (or None), got {filename!r}')
else:
filename, _ = _resolve_filename(filename)
return source, filename
@contextlib.contextmanager
def good_file(filename, alt=None):
if not _looks_like_filename(filename):
raise ValueError(f'expected a filename, got {filename}')
filename, _ = _resolve_filename(filename, alt)
try:
yield filename
except Exception:
if not os.path.exists(filename):
raise FileNotFoundError(f'file not found: {filename}')
raise # re-raise
def _looks_like_filename(value):
if not isinstance(value, str):
return False
return value.endswith(('.c', '.h'))
def _resolve_filename(filename, alt=None):
if os.path.isabs(filename):
...
# raise NotImplementedError
else:
filename = os.path.join('.', filename)
if not alt:
alt = filename
elif os.path.abspath(filename) == os.path.abspath(alt):
alt = filename
else:
raise ValueError(f'mismatch: {filename} != {alt}')
return filename, alt
@contextlib.contextmanager
def opened(source, filename=None):
source, filename = resolve(source, filename)
if isinstance(source, str):
with open(source) as srcfile:
yield srcfile, filename
else:
yield source, filename
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