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# Copyright (C) 2006 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Tools for converting globs to regular expressions.
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This module provides functions for converting shell-like globs to regular
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from bzrlib.trace import (
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class Replacer(object):
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"""Do a multiple-pattern substitution.
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The patterns and substitutions are combined into one, so the result of
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one replacement is never substituted again. Add the patterns and
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replacements via the add method and then call the object. The patterns
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must not contain capturing groups.
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_expand = re.compile(ur'\\&')
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def __init__(self, source=None):
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self._pats = list(source._pats)
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self._funs = list(source._funs)
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def add(self, pat, fun):
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r"""Add a pattern and replacement.
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The pattern must not contain capturing groups.
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The replacement might be either a string template in which \& will be
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replaced with the match, or a function that will get the matching text
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as argument. It does not get match object, because capturing is
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self._pats.append(pat)
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self._funs.append(fun)
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def add_replacer(self, replacer):
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r"""Add all patterns from another replacer.
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All patterns and replacements from replacer are appended to the ones
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self._pats.extend(replacer._pats)
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self._funs.extend(replacer._funs)
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def __call__(self, text):
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self._pat = re.compile(
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u'|'.join([u'(%s)' % p for p in self._pats]),
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return self._pat.sub(self._do_sub, text)
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fun = self._funs[m.lastindex - 1]
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if hasattr(fun, '__call__'):
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return fun(m.group(0))
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return self._expand.sub(m.group(0), fun)
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_sub_named = Replacer()
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_sub_named.add(ur'\[:digit:\]', ur'\d')
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_sub_named.add(ur'\[:space:\]', ur'\s')
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_sub_named.add(ur'\[:alnum:\]', ur'\w')
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_sub_named.add(ur'\[:ascii:\]', ur'\0-\x7f')
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_sub_named.add(ur'\[:blank:\]', ur' \t')
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_sub_named.add(ur'\[:cntrl:\]', ur'\0-\x1f\x7f-\x9f')
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if m[1] in (u'!', u'^'):
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return u'[^' + _sub_named(m[2:-1]) + u']'
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return u'[' + _sub_named(m[1:-1]) + u']'
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def _invalid_regex(repl):
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warning(u"'%s' not allowed within a regular expression. "
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"Replacing with '%s'" % (m, repl))
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def _trailing_backslashes_regex(m):
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"""Check trailing backslashes.
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Does a head count on trailing backslashes to ensure there isn't an odd
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one on the end that would escape the brackets we wrap the RE in.
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if (len(m) % 2) != 0:
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warning(u"Regular expressions cannot end with an odd number of '\\'. "
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"Dropping the final '\\'.")
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_sub_re.add(u'^RE:', u'')
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_sub_re.add(u'\((?!\?)', u'(?:')
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_sub_re.add(u'\(\?P<.*>', _invalid_regex(u'(?:'))
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_sub_re.add(u'\(\?P=[^)]*\)', _invalid_regex(u''))
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_sub_re.add(ur'\\+$', _trailing_backslashes_regex)
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_sub_fullpath = Replacer()
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_sub_fullpath.add(ur'^RE:.*', _sub_re) # RE:<anything> is a regex
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_sub_fullpath.add(ur'\[\^?\]?(?:[^][]|\[:[^]]+:\])+\]', _sub_group) # char group
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_sub_fullpath.add(ur'(?:(?<=/)|^)(?:\.?/)+', u'') # canonicalize path
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_sub_fullpath.add(ur'\\.', ur'\&') # keep anything backslashed
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_sub_fullpath.add(ur'[(){}|^$+.]', ur'\\&') # escape specials
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_sub_fullpath.add(ur'(?:(?<=/)|^)\*\*+/', ur'(?:.*/)?') # **/ after ^ or /
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_sub_fullpath.add(ur'\*+', ur'[^/]*') # * elsewhere
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_sub_fullpath.add(ur'\?', ur'[^/]') # ? everywhere
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_sub_basename = Replacer()
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_sub_basename.add(ur'\[\^?\]?(?:[^][]|\[:[^]]+:\])+\]', _sub_group) # char group
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_sub_basename.add(ur'\\.', ur'\&') # keep anything backslashed
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_sub_basename.add(ur'[(){}|^$+.]', ur'\\&') # escape specials
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_sub_basename.add(ur'\*+', ur'.*') # * everywhere
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_sub_basename.add(ur'\?', ur'.') # ? everywhere
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def _sub_extension(pattern):
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return _sub_basename(pattern[2:])
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class Globster(object):
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"""A simple wrapper for a set of glob patterns.
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Provides the capability to search the patterns to find a match for
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a given filename (including the full path).
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Patterns are translated to regular expressions to expidite matching.
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The regular expressions for multiple patterns are aggregated into
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a super-regex containing groups of up to 99 patterns.
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The 99 limitation is due to the grouping limit of the Python re module.
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The resulting super-regex and associated patterns are stored as a list of
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(regex,[patterns]) in _regex_patterns.
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For performance reasons the patterns are categorised as extension patterns
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(those that match against a file extension), basename patterns
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(those that match against the basename of the filename),
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and fullpath patterns (those that match against the full path).
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The translations used for extensions and basenames are relatively simpler
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and therefore faster to perform than the fullpath patterns.
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Also, the extension patterns are more likely to find a match and
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so are matched first, then the basename patterns, then the fullpath
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def __init__(self, patterns):
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self._regex_patterns = []
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pat = normalize_pattern(pat)
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if pat.startswith(u'RE:') or u'/' in pat:
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path_patterns.append(pat)
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elif pat.startswith(u'*.'):
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ext_patterns.append(pat)
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base_patterns.append(pat)
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self._add_patterns(ext_patterns,_sub_extension,
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prefix=r'(?:.*/)?(?!.*/)(?:.*\.)')
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self._add_patterns(base_patterns,_sub_basename,
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prefix=r'(?:.*/)?(?!.*/)')
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self._add_patterns(path_patterns,_sub_fullpath)
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def _add_patterns(self, patterns, translator, prefix=''):
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grouped_rules = ['(%s)' % translator(pat) for pat in patterns[:99]]
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joined_rule = '%s(?:%s)$' % (prefix, '|'.join(grouped_rules))
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self._regex_patterns.append((re.compile(joined_rule, re.UNICODE),
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patterns = patterns[99:]
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def match(self, filename):
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"""Searches for a pattern that matches the given filename.
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:return A matching pattern or None if there is no matching pattern.
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for regex, patterns in self._regex_patterns:
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match = regex.match(filename)
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return patterns[match.lastindex -1]
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def normalize_pattern(pattern):
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"""Converts backslashes in path patterns to forward slashes.
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Doesn't normalize regular expressions - they may contain escapes.
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if not pattern.startswith('RE:'):
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pattern = pattern.replace('\\','/')
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return pattern.rstrip('/')
added
removed
bzrlib/globbing.py
