mirror of https://github.com/python/cpython
GH-72904: Add `glob.translate()` function (#106703)
Add `glob.translate()` function that converts a pathname with shell wildcards to a regular expression. The regular expression is used by pathlib to implement `match()` and `glob()`. This function differs from `fnmatch.translate()` in that wildcards do not match path separators by default, and that a `*` pattern segment matches precisely one path segment. When *recursive* is set to true, `**` pattern segments match any number of path segments, and `**` cannot appear outside its own segment. In pathlib, this change speeds up directory walking (because `_make_child_relpath()` does less work), makes path objects smaller (they don't need a `_lines` slot), and removes the need for some gnarly code. Co-authored-by: Jason R. Coombs <jaraco@jaraco.com> Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
This commit is contained in:
Barney Gale
GitHub
parent
babb787047
commit
cf67ebfb31
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@ -145,6 +145,45 @@ default. For example, consider a directory containing :file:`card.gif` and
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>>> glob.glob('.c*')
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['.card.gif']
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.. function:: translate(pathname, *, recursive=False, include_hidden=False, seps=None)
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Convert the given path specification to a regular expression for use with
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:func:`re.match`. The path specification can contain shell-style wildcards.
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For example:
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>>> import glob, re
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>>>
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>>> regex = glob.translate('**/*.txt', recursive=True, include_hidden=True)
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>>> regex
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'(?s:(?:.+/)?[^/]*\\.txt)\\Z'
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>>> reobj = re.compile(regex)
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>>> reobj.match('foo/bar/baz.txt')
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<re.Match object; span=(0, 15), match='foo/bar/baz.txt'>
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Path separators and segments are meaningful to this function, unlike
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:func:`fnmatch.translate`. By default wildcards do not match path
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separators, and ``*`` pattern segments match precisely one path segment.
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If *recursive* is true, the pattern segment "``**``" will match any number
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of path segments. If "``**``" occurs in any position other than a full
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pattern segment, :exc:`ValueError` is raised.
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If *include_hidden* is true, wildcards can match path segments that start
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with a dot (``.``).
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A sequence of path separators may be supplied to the *seps* argument. If
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not given, :data:`os.sep` and :data:`~os.altsep` (if available) are used.
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.. seealso::
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:meth:`pathlib.PurePath.match` and :meth:`pathlib.Path.glob` methods,
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which call this function to implement pattern matching and globbing.
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.. versionadded:: 3.13
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.. seealso::
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Module :mod:`fnmatch`
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@ -183,6 +183,13 @@ doctest
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:attr:`doctest.TestResults.skipped` attributes.
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(Contributed by Victor Stinner in :gh:`108794`.)
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glob
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----
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* Add :func:`glob.translate` function that converts a path specification with
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shell-style wildcards to a regular expression.
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(Contributed by Barney Gale in :gh:`72904`.)
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io
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--
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@ -78,6 +78,11 @@ def translate(pat):
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"""
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STAR = object()
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parts = _translate(pat, STAR, '.')
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return _join_translated_parts(parts, STAR)
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def _translate(pat, STAR, QUESTION_MARK):
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res = []
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add = res.append
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i, n = 0, len(pat)
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@ -89,7 +94,7 @@ def translate(pat):
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if (not res) or res[-1] is not STAR:
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add(STAR)
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elif c == '?':
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add('.')
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add(QUESTION_MARK)
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elif c == '[':
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j = i
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if j < n and pat[j] == '!':
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@ -146,9 +151,11 @@ def translate(pat):
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else:
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add(re.escape(c))
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assert i == n
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return res
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def _join_translated_parts(inp, STAR):
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# Deal with STARs.
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inp = res
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res = []
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add = res.append
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i, n = 0, len(inp)
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60
Lib/glob.py
60
Lib/glob.py
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@ -249,3 +249,63 @@ def escape(pathname):
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_dir_open_flags = os.O_RDONLY | getattr(os, 'O_DIRECTORY', 0)
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def translate(pat, *, recursive=False, include_hidden=False, seps=None):
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"""Translate a pathname with shell wildcards to a regular expression.
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If `recursive` is true, the pattern segment '**' will match any number of
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path segments; if '**' appears outside its own segment, ValueError will be
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raised.
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If `include_hidden` is true, wildcards can match path segments beginning
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with a dot ('.').
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If a sequence of separator characters is given to `seps`, they will be
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used to split the pattern into segments and match path separators. If not
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given, os.path.sep and os.path.altsep (where available) are used.
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"""
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if not seps:
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if os.path.altsep:
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seps = (os.path.sep, os.path.altsep)
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else:
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seps = os.path.sep
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escaped_seps = ''.join(map(re.escape, seps))
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any_sep = f'[{escaped_seps}]' if len(seps) > 1 else escaped_seps
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not_sep = f'[^{escaped_seps}]'
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if include_hidden:
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one_last_segment = f'{not_sep}+'
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one_segment = f'{one_last_segment}{any_sep}'
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any_segments = f'(?:.+{any_sep})?'
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any_last_segments = '.*'
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else:
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one_last_segment = f'[^{escaped_seps}.]{not_sep}*'
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one_segment = f'{one_last_segment}{any_sep}'
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any_segments = f'(?:{one_segment})*'
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any_last_segments = f'{any_segments}(?:{one_last_segment})?'
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results = []
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parts = re.split(any_sep, pat)
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last_part_idx = len(parts) - 1
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for idx, part in enumerate(parts):
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if part == '*':
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results.append(one_segment if idx < last_part_idx else one_last_segment)
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continue
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if recursive:
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if part == '**':
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if idx < last_part_idx:
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if parts[idx + 1] != '**':
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results.append(any_segments)
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else:
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results.append(any_last_segments)
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continue
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elif '**' in part:
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raise ValueError("Invalid pattern: '**' can only be an entire path component")
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if part:
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if not include_hidden and part[0] in '*?':
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results.append(r'(?!\.)')
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results.extend(fnmatch._translate(part, f'{not_sep}*', not_sep))
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if idx < last_part_idx:
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results.append(any_sep)
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res = ''.join(results)
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return fr'(?s:{res})\Z'
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125
Lib/pathlib.py
125
Lib/pathlib.py
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@ -6,8 +6,8 @@ operating systems.
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"""
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import contextlib
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import fnmatch
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import functools
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import glob
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import io
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import ntpath
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import os
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@ -76,78 +76,16 @@ def _is_case_sensitive(pathmod):
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#
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# fnmatch.translate() returns a regular expression that includes a prefix and
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# a suffix, which enable matching newlines and ensure the end of the string is
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# matched, respectively. These features are undesirable for our implementation
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# of PurePatch.match(), which represents path separators as newlines and joins
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# pattern segments together. As a workaround, we define a slice object that
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# can remove the prefix and suffix from any translate() result. See the
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# _compile_pattern_lines() function for more details.
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_FNMATCH_PREFIX, _FNMATCH_SUFFIX = fnmatch.translate('_').split('_')
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_FNMATCH_SLICE = slice(len(_FNMATCH_PREFIX), -len(_FNMATCH_SUFFIX))
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_SWAP_SEP_AND_NEWLINE = {
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'/': str.maketrans({'/': '\n', '\n': '/'}),
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'\\': str.maketrans({'\\': '\n', '\n': '\\'}),
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}
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@functools.lru_cache(maxsize=256)
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def _compile_pattern(pat, case_sensitive):
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def _compile_pattern(pat, sep, case_sensitive):
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"""Compile given glob pattern to a re.Pattern object (observing case
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sensitivity), or None if the pattern should match everything."""
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if pat == '*':
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return None
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sensitivity)."""
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flags = re.NOFLAG if case_sensitive else re.IGNORECASE
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return re.compile(fnmatch.translate(pat), flags).match
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@functools.lru_cache()
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def _compile_pattern_lines(pattern_lines, case_sensitive):
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"""Compile the given pattern lines to an `re.Pattern` object.
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The *pattern_lines* argument is a glob-style pattern (e.g. '**/*.py') with
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its path separators and newlines swapped (e.g. '**\n*.py`). By using
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newlines to separate path components, and not setting `re.DOTALL`, we
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ensure that the `*` wildcard cannot match path separators.
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The returned `re.Pattern` object may have its `match()` method called to
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match a complete pattern, or `search()` to match from the right. The
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argument supplied to these methods must also have its path separators and
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newlines swapped.
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"""
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# Match the start of the path, or just after a path separator
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parts = ['^']
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for part in pattern_lines.splitlines(keepends=True):
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if part == '*\n':
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part = r'.+\n'
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elif part == '*':
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part = r'.+'
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elif part == '**\n':
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# '**/' component: we use '(?s:.)' rather than '.' so that path
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# separators (i.e. newlines) are matched. The trailing '^' ensures
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# we terminate after a path separator (i.e. on a new line).
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part = r'(?s:.)*^'
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elif part == '**':
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# '**' component.
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part = r'(?s:.)*'
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elif '**' in part:
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raise ValueError("Invalid pattern: '**' can only be an entire path component")
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else:
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# Any other component: pass to fnmatch.translate(). We slice off
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# the common prefix and suffix added by translate() to ensure that
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# re.DOTALL is not set, and the end of the string not matched,
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# respectively. With DOTALL not set, '*' wildcards will not match
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# path separators, because the '.' characters in the pattern will
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# not match newlines.
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part = fnmatch.translate(part)[_FNMATCH_SLICE]
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parts.append(part)
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# Match the end of the path, always.
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parts.append(r'\Z')
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flags = re.MULTILINE
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if not case_sensitive:
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flags |= re.IGNORECASE
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return re.compile(''.join(parts), flags=flags)
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regex = glob.translate(pat, recursive=True, include_hidden=True, seps=sep)
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# The string representation of an empty path is a single dot ('.'). Empty
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# paths shouldn't match wildcards, so we consume it with an atomic group.
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regex = r'(\.\Z)?+' + regex
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return re.compile(regex, flags).match
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def _select_children(parent_paths, dir_only, follow_symlinks, match):
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@ -171,7 +109,7 @@ def _select_children(parent_paths, dir_only, follow_symlinks, match):
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except OSError:
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continue
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name = entry.name
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if match is None or match(name):
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if match(name):
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yield parent_path._make_child_relpath(name)
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@ -297,10 +235,6 @@ class PurePath:
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# to implement comparison methods like `__lt__()`.
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'_parts_normcase_cached',
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# The `_lines_cached` slot stores the string path with path separators
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# and newlines swapped. This is used to implement `match()`.
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'_lines_cached',
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# The `_hash` slot stores the hash of the case-normalized string
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# path. It's set when `__hash__()` is called for the first time.
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'_hash',
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@ -475,20 +409,6 @@ class PurePath:
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self._parts_normcase_cached = self._str_normcase.split(self.pathmod.sep)
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return self._parts_normcase_cached
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@property
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def _lines(self):
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# Path with separators and newlines swapped, for pattern matching.
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try:
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return self._lines_cached
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except AttributeError:
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path_str = str(self)
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if path_str == '.':
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self._lines_cached = ''
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else:
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trans = _SWAP_SEP_AND_NEWLINE[self.pathmod.sep]
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self._lines_cached = path_str.translate(trans)
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return self._lines_cached
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def __eq__(self, other):
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if not isinstance(other, PurePath):
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return NotImplemented
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@ -763,13 +683,16 @@ class PurePath:
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path_pattern = self.with_segments(path_pattern)
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if case_sensitive is None:
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case_sensitive = _is_case_sensitive(self.pathmod)
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pattern = _compile_pattern_lines(path_pattern._lines, case_sensitive)
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sep = path_pattern.pathmod.sep
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pattern_str = str(path_pattern)
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if path_pattern.drive or path_pattern.root:
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return pattern.match(self._lines) is not None
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pass
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elif path_pattern._tail:
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return pattern.search(self._lines) is not None
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pattern_str = f'**{sep}{pattern_str}'
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else:
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raise ValueError("empty pattern")
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match = _compile_pattern(pattern_str, sep, case_sensitive)
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return match(str(self)) is not None
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# Subclassing os.PathLike makes isinstance() checks slower,
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@ -1069,26 +992,19 @@ class _PathBase(PurePath):
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return contextlib.nullcontext(self.iterdir())
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def _make_child_relpath(self, name):
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sep = self.pathmod.sep
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lines_name = name.replace('\n', sep)
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lines_str = self._lines
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path_str = str(self)
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tail = self._tail
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if tail:
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path_str = f'{path_str}{sep}{name}'
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lines_str = f'{lines_str}\n{lines_name}'
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path_str = f'{path_str}{self.pathmod.sep}{name}'
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elif path_str != '.':
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path_str = f'{path_str}{name}'
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lines_str = f'{lines_str}{lines_name}'
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else:
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path_str = name
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lines_str = lines_name
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path = self.with_segments(path_str)
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path._str = path_str
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path._drv = self.drive
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path._root = self.root
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path._tail_cached = tail + [name]
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path._lines_cached = lines_str
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return path
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def glob(self, pattern, *, case_sensitive=None, follow_symlinks=None):
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# do not perform any filesystem access, which can be much faster!
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filter_paths = follow_symlinks is not None and '..' not in pattern_parts
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deduplicate_paths = False
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sep = self.pathmod.sep
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paths = iter([self] if self.is_dir() else [])
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part_idx = 0
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while part_idx < len(pattern_parts):
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@ -1159,9 +1076,9 @@ class _PathBase(PurePath):
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paths = _select_recursive(paths, dir_only, follow_symlinks)
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# Filter out paths that don't match pattern.
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prefix_len = len(self._make_child_relpath('_')._lines) - 1
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match = _compile_pattern_lines(path_pattern._lines, case_sensitive).match
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paths = (path for path in paths if match(path._lines[prefix_len:]))
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prefix_len = len(str(self._make_child_relpath('_'))) - 1
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match = _compile_pattern(str(path_pattern), sep, case_sensitive)
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paths = (path for path in paths if match(str(path), prefix_len))
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return paths
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dir_only = part_idx < len(pattern_parts)
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@ -1174,7 +1091,7 @@ class _PathBase(PurePath):
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raise ValueError("Invalid pattern: '**' can only be an entire path component")
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else:
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dir_only = part_idx < len(pattern_parts)
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match = _compile_pattern(part, case_sensitive)
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match = _compile_pattern(part, sep, case_sensitive)
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paths = _select_children(paths, dir_only, follow_symlinks, match)
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return paths
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@ -1,5 +1,6 @@
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import glob
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import os
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import re
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import shutil
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import sys
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import unittest
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@ -349,6 +350,96 @@ class GlobTests(unittest.TestCase):
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for it in iters:
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self.assertEqual(next(it), p)
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def test_translate_matching(self):
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match = re.compile(glob.translate('*')).match
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self.assertIsNotNone(match('foo'))
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self.assertIsNotNone(match('foo.bar'))
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self.assertIsNone(match('.foo'))
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match = re.compile(glob.translate('.*')).match
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self.assertIsNotNone(match('.foo'))
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match = re.compile(glob.translate('**', recursive=True)).match
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self.assertIsNotNone(match('foo'))
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self.assertIsNone(match('.foo'))
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self.assertIsNotNone(match(os.path.join('foo', 'bar')))
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self.assertIsNone(match(os.path.join('foo', '.bar')))
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self.assertIsNone(match(os.path.join('.foo', 'bar')))
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self.assertIsNone(match(os.path.join('.foo', '.bar')))
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match = re.compile(glob.translate('**/*', recursive=True)).match
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self.assertIsNotNone(match(os.path.join('foo', 'bar')))
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self.assertIsNone(match(os.path.join('foo', '.bar')))
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self.assertIsNone(match(os.path.join('.foo', 'bar')))
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self.assertIsNone(match(os.path.join('.foo', '.bar')))
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match = re.compile(glob.translate('*/**', recursive=True)).match
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self.assertIsNotNone(match(os.path.join('foo', 'bar')))
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self.assertIsNone(match(os.path.join('foo', '.bar')))
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self.assertIsNone(match(os.path.join('.foo', 'bar')))
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self.assertIsNone(match(os.path.join('.foo', '.bar')))
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match = re.compile(glob.translate('**/.bar', recursive=True)).match
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self.assertIsNotNone(match(os.path.join('foo', '.bar')))
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self.assertIsNone(match(os.path.join('.foo', '.bar')))
|
||||
match = re.compile(glob.translate('**/*.*', recursive=True)).match
|
||||
self.assertIsNone(match(os.path.join('foo', 'bar')))
|
||||
self.assertIsNone(match(os.path.join('foo', '.bar')))
|
||||
self.assertIsNotNone(match(os.path.join('foo', 'bar.txt')))
|
||||
self.assertIsNone(match(os.path.join('foo', '.bar.txt')))
|
||||
|
||||
def test_translate(self):
|
||||
def fn(pat):
|
||||
return glob.translate(pat, seps='/')
|
||||
self.assertEqual(fn('foo'), r'(?s:foo)\Z')
|
||||
self.assertEqual(fn('foo/bar'), r'(?s:foo/bar)\Z')
|
||||
self.assertEqual(fn('*'), r'(?s:[^/.][^/]*)\Z')
|
||||
self.assertEqual(fn('?'), r'(?s:(?!\.)[^/])\Z')
|
||||
self.assertEqual(fn('a*'), r'(?s:a[^/]*)\Z')
|
||||
self.assertEqual(fn('*a'), r'(?s:(?!\.)[^/]*a)\Z')
|
||||
self.assertEqual(fn('.*'), r'(?s:\.[^/]*)\Z')
|
||||
self.assertEqual(fn('?aa'), r'(?s:(?!\.)[^/]aa)\Z')
|
||||
self.assertEqual(fn('aa?'), r'(?s:aa[^/])\Z')
|
||||
self.assertEqual(fn('aa[ab]'), r'(?s:aa[ab])\Z')
|
||||
self.assertEqual(fn('**'), r'(?s:(?!\.)[^/]*)\Z')
|
||||
self.assertEqual(fn('***'), r'(?s:(?!\.)[^/]*)\Z')
|
||||
self.assertEqual(fn('a**'), r'(?s:a[^/]*)\Z')
|
||||
self.assertEqual(fn('**b'), r'(?s:(?!\.)[^/]*b)\Z')
|
||||
self.assertEqual(fn('/**/*/*.*/**'),
|
||||
r'(?s:/(?!\.)[^/]*/[^/.][^/]*/(?!\.)[^/]*\.[^/]*/(?!\.)[^/]*)\Z')
|
||||
|
||||
def test_translate_include_hidden(self):
|
||||
def fn(pat):
|
||||
return glob.translate(pat, include_hidden=True, seps='/')
|
||||
self.assertEqual(fn('foo'), r'(?s:foo)\Z')
|
||||
self.assertEqual(fn('foo/bar'), r'(?s:foo/bar)\Z')
|
||||
self.assertEqual(fn('*'), r'(?s:[^/]+)\Z')
|
||||
self.assertEqual(fn('?'), r'(?s:[^/])\Z')
|
||||
self.assertEqual(fn('a*'), r'(?s:a[^/]*)\Z')
|
||||
self.assertEqual(fn('*a'), r'(?s:[^/]*a)\Z')
|
||||
self.assertEqual(fn('.*'), r'(?s:\.[^/]*)\Z')
|
||||
self.assertEqual(fn('?aa'), r'(?s:[^/]aa)\Z')
|
||||
self.assertEqual(fn('aa?'), r'(?s:aa[^/])\Z')
|
||||
self.assertEqual(fn('aa[ab]'), r'(?s:aa[ab])\Z')
|
||||
self.assertEqual(fn('**'), r'(?s:[^/]*)\Z')
|
||||
self.assertEqual(fn('***'), r'(?s:[^/]*)\Z')
|
||||
self.assertEqual(fn('a**'), r'(?s:a[^/]*)\Z')
|
||||
self.assertEqual(fn('**b'), r'(?s:[^/]*b)\Z')
|
||||
self.assertEqual(fn('/**/*/*.*/**'), r'(?s:/[^/]*/[^/]+/[^/]*\.[^/]*/[^/]*)\Z')
|
||||
|
||||
def test_translate_recursive(self):
|
||||
def fn(pat):
|
||||
return glob.translate(pat, recursive=True, include_hidden=True, seps='/')
|
||||
self.assertEqual(fn('*'), r'(?s:[^/]+)\Z')
|
||||
self.assertEqual(fn('?'), r'(?s:[^/])\Z')
|
||||
self.assertEqual(fn('**'), r'(?s:.*)\Z')
|
||||
self.assertEqual(fn('**/**'), r'(?s:.*)\Z')
|
||||
self.assertRaises(ValueError, fn, '***')
|
||||
self.assertRaises(ValueError, fn, 'a**')
|
||||
self.assertRaises(ValueError, fn, '**b')
|
||||
self.assertEqual(fn('/**/*/*.*/**'), r'(?s:/(?:.+/)?[^/]+/[^/]*\.[^/]*/.*)\Z')
|
||||
|
||||
def test_translate_seps(self):
|
||||
def fn(pat):
|
||||
return glob.translate(pat, recursive=True, include_hidden=True, seps=['/', '\\'])
|
||||
self.assertEqual(fn('foo/bar\\baz'), r'(?s:foo[/\\]bar[/\\]baz)\Z')
|
||||
self.assertEqual(fn('**/*'), r'(?s:(?:.+[/\\])?[^/\\]+)\Z')
|
||||
|
||||
|
||||
@skip_unless_symlink
|
||||
class SymlinkLoopGlobTests(unittest.TestCase):
|
||||
|
|
|
|||
|
|
@ -0,0 +1,2 @@
|
|||
Add :func:`glob.translate`. This function converts a pathname with shell-style
|
||||
wildcards to a regular expression.
|
||||
Loading…
Reference in New Issue