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82 lines
1.9 KiB
Python
82 lines
1.9 KiB
Python
"""
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Helper functions for file reading and writing
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"""
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from typing import Union, IO, Iterator
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import re
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import pathlib
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import logging
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import tempfile
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import shutil
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from contextlib import contextmanager
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from .. import Pattern, PatternError
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from ..shapes import Polygon, Path
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logger = logging.getLogger(__name__)
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def mangle_name(name: str) -> str:
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"""
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Sanitize a name.
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Args:
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name: Name we want to mangle.
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Returns:
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Mangled name.
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"""
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expression = re.compile(r'[^A-Za-z0-9_\?\$]')
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sanitized_name = expression.sub('_', name)
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return sanitized_name
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def clean_pattern_vertices(pat: Pattern) -> Pattern:
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"""
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Given a pattern, remove any redundant vertices in its polygons and paths.
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The cleaning process completely removes any polygons with zero area or <3 vertices.
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Args:
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pat: Pattern to clean
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Returns:
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pat
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"""
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remove_inds = []
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for ii, shape in enumerate(pat.shapes):
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if not isinstance(shape, (Polygon, Path)):
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continue
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try:
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shape.clean_vertices()
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except PatternError:
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remove_inds.append(ii)
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for ii in sorted(remove_inds, reverse=True):
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del pat.shapes[ii]
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return pat
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def is_gzipped(path: pathlib.Path) -> bool:
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with open(path, 'rb') as stream:
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magic_bytes = stream.read(2)
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return magic_bytes == b'\x1f\x8b'
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@contextmanager
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def tmpfile(path: Union[str, pathlib.Path]) -> Iterator[IO[bytes]]:
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"""
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Context manager which allows you to write to a temporary file,
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and move that file into its final location only after the write
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has finished.
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"""
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path = pathlib.Path(path)
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suffixes = ''.join(path.suffixes)
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with tempfile.NamedTemporaryFile(suffix=suffixes, delete=False) as tmp_stream:
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yield tmp_stream
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try:
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shutil.move(tmp_stream.name, path)
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finally:
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pathlib.Path(tmp_stream.name).unlink(missing_ok=True)
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