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# match.py - filename matching
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#
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# Copyright 2008, 2009 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import re
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import util, pathutil
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from i18n import _
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def _rematcher(regex):
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'''compile the regexp with the best available regexp engine and return a
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matcher function'''
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m = util.re.compile(regex)
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try:
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# slightly faster, provided by facebook's re2 bindings
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return m.test_match
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except AttributeError:
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return m.match
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def _expandsets(kindpats, ctx):
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'''Returns the kindpats list with the 'set' patterns expanded.'''
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fset = set()
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other = []
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for kind, pat in kindpats:
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if kind == 'set':
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if not ctx:
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raise util.Abort("fileset expression with no context")
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s = ctx.getfileset(pat)
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fset.update(s)
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continue
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other.append((kind, pat))
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return fset, other
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class match(object):
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def __init__(self, root, cwd, patterns, include=[], exclude=[],
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default='glob', exact=False, auditor=None, ctx=None):
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"""build an object to match a set of file patterns
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arguments:
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root - the canonical root of the tree you're matching against
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cwd - the current working directory, if relevant
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patterns - patterns to find
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include - patterns to include (unless they are excluded)
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exclude - patterns to exclude (even if they are included)
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default - if a pattern in patterns has no explicit type, assume this one
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exact - patterns are actually filenames (include/exclude still apply)
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a pattern is one of:
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'glob:<glob>' - a glob relative to cwd
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're:<regexp>' - a regular expression
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'path:<path>' - a path relative to repository root
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'relglob:<glob>' - an unrooted glob (*.c matches C files in all dirs)
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'relpath:<path>' - a path relative to cwd
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'relre:<regexp>' - a regexp that needn't match the start of a name
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'set:<fileset>' - a fileset expression
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'<something>' - a pattern of the specified default type
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"""
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self._root = root
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self._cwd = cwd
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self._files = [] # exact files and roots of patterns
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self._anypats = bool(include or exclude)
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self._ctx = ctx
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self._always = False
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matchfns = []
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if include:
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kindpats = _normalize(include, 'glob', root, cwd, auditor)
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self.includepat, im = _buildmatch(ctx, kindpats, '(?:/|$)')
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matchfns.append(im)
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if exclude:
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kindpats = _normalize(exclude, 'glob', root, cwd, auditor)
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self.excludepat, em = _buildmatch(ctx, kindpats, '(?:/|$)')
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matchfns.append(lambda f: not em(f))
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if exact:
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if isinstance(patterns, list):
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self._files = patterns
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else:
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self._files = list(patterns)
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matchfns.append(self.exact)
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elif patterns:
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kindpats = _normalize(patterns, default, root, cwd, auditor)
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self._files = _roots(kindpats)
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self._anypats = self._anypats or _anypats(kindpats)
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self.patternspat, pm = _buildmatch(ctx, kindpats, '$')
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matchfns.append(pm)
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if not matchfns:
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m = util.always
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self._always = True
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elif len(matchfns) == 1:
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m = matchfns[0]
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else:
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def m(f):
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for matchfn in matchfns:
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if not matchfn(f):
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return False
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return True
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self.matchfn = m
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self._fmap = set(self._files)
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def __call__(self, fn):
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return self.matchfn(fn)
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def __iter__(self):
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for f in self._files:
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yield f
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# Callbacks related to how the matcher is used by dirstate.walk.
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# Subscribers to these events must monkeypatch the matcher object.
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def bad(self, f, msg):
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'''Callback from dirstate.walk for each explicit file that can't be
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found/accessed, with an error message.'''
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pass
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# If an explicitdir is set, it will be called when an explicitly listed
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# directory is visited.
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explicitdir = None
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# If an traversedir is set, it will be called when a directory discovered
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# by recursive traversal is visited.
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traversedir = None
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def rel(self, f):
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'''Convert repo path back to path that is relative to cwd of matcher.'''
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return util.pathto(self._root, self._cwd, f)
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def files(self):
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'''Explicitly listed files or patterns or roots:
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if no patterns or .always(): empty list,
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if exact: list exact files,
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if not .anypats(): list all files and dirs,
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else: optimal roots'''
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return self._files
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def exact(self, f):
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'''Returns True if f is in .files().'''
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return f in self._fmap
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def anypats(self):
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'''Matcher uses patterns or include/exclude.'''
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return self._anypats
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def always(self):
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'''Matcher will match everything and .files() will be empty
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- optimization might be possible and necessary.'''
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return self._always
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class exact(match):
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def __init__(self, root, cwd, files):
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match.__init__(self, root, cwd, files, exact=True)
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class always(match):
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def __init__(self, root, cwd):
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match.__init__(self, root, cwd, [])
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class narrowmatcher(match):
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"""Adapt a matcher to work on a subdirectory only.
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The paths are remapped to remove/insert the path as needed:
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>>> m1 = match('root', '', ['a.txt', 'sub/b.txt'])
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>>> m2 = narrowmatcher('sub', m1)
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>>> bool(m2('a.txt'))
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False
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>>> bool(m2('b.txt'))
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True
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>>> bool(m2.matchfn('a.txt'))
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False
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>>> bool(m2.matchfn('b.txt'))
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True
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>>> m2.files()
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['b.txt']
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>>> m2.exact('b.txt')
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True
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>>> m2.rel('b.txt')
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'b.txt'
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>>> def bad(f, msg):
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... print "%s: %s" % (f, msg)
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>>> m1.bad = bad
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>>> m2.bad('x.txt', 'No such file')
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sub/x.txt: No such file
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"""
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def __init__(self, path, matcher):
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self._root = matcher._root
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self._cwd = matcher._cwd
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self._path = path
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self._matcher = matcher
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self._always = matcher._always
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self._files = [f[len(path) + 1:] for f in matcher._files
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if f.startswith(path + "/")]
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self._anypats = matcher._anypats
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self.matchfn = lambda fn: matcher.matchfn(self._path + "/" + fn)
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self._fmap = set(self._files)
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def bad(self, f, msg):
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self._matcher.bad(self._path + "/" + f, msg)
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def patkind(pattern, default=None):
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'''If pattern is 'kind:pat' with a known kind, return kind.'''
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return _patsplit(pattern, default)[0]
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def _patsplit(pattern, default):
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"""Split a string into the optional pattern kind prefix and the actual
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pattern."""
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if ':' in pattern:
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kind, pat = pattern.split(':', 1)
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if kind in ('re', 'glob', 'path', 'relglob', 'relpath', 'relre',
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'listfile', 'listfile0', 'set'):
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return kind, pat
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return default, pattern
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def _globre(pat):
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r'''Convert an extended glob string to a regexp string.
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>>> print _globre(r'?')
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.
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>>> print _globre(r'*')
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[^/]*
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>>> print _globre(r'**')
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.*
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>>> print _globre(r'**/a')
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(?:.*/)?a
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>>> print _globre(r'a/**/b')
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a\/(?:.*/)?b
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>>> print _globre(r'[a*?!^][^b][!c]')
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[a*?!^][\^b][^c]
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>>> print _globre(r'{a,b}')
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(?:a|b)
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>>> print _globre(r'.\*\?')
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\.\*\?
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'''
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i, n = 0, len(pat)
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res = ''
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group = 0
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escape = util.re.escape
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def peek():
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return i < n and pat[i]
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while i < n:
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c = pat[i]
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i += 1
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if c not in '*?[{},\\':
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res += escape(c)
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elif c == '*':
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if peek() == '*':
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i += 1
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if peek() == '/':
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i += 1
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res += '(?:.*/)?'
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else:
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res += '.*'
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else:
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res += '[^/]*'
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elif c == '?':
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res += '.'
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elif c == '[':
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j = i
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if j < n and pat[j] in '!]':
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j += 1
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while j < n and pat[j] != ']':
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j += 1
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if j >= n:
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res += '\\['
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else:
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stuff = pat[i:j].replace('\\','\\\\')
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i = j + 1
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if stuff[0] == '!':
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stuff = '^' + stuff[1:]
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elif stuff[0] == '^':
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stuff = '\\' + stuff
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res = '%s[%s]' % (res, stuff)
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elif c == '{':
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group += 1
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res += '(?:'
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elif c == '}' and group:
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res += ')'
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group -= 1
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elif c == ',' and group:
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res += '|'
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elif c == '\\':
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p = peek()
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if p:
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i += 1
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res += escape(p)
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else:
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res += escape(c)
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else:
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res += escape(c)
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return res
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def _regex(kind, pat, globsuffix):
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'''Convert a (normalized) pattern of any kind into a regular expression.
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globsuffix is appended to the regexp of globs.'''
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if not pat:
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return ''
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if kind == 're':
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return pat
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if kind == 'path':
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return '^' + util.re.escape(pat) + '(?:/|$)'
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if kind == 'relglob':
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return '(?:|.*/)' + _globre(pat) + globsuffix
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if kind == 'relpath':
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return util.re.escape(pat) + '(?:/|$)'
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if kind == 'relre':
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if pat.startswith('^'):
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return pat
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return '.*' + pat
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return _globre(pat) + globsuffix
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def _buildmatch(ctx, kindpats, globsuffix):
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'''Return regexp string and a matcher function for kindpats.
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globsuffix is appended to the regexp of globs.'''
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fset, kindpats = _expandsets(kindpats, ctx)
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if not kindpats:
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return "", fset.__contains__
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regex, mf = _buildregexmatch(kindpats, globsuffix)
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if fset:
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return regex, lambda f: f in fset or mf(f)
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return regex, mf
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def _buildregexmatch(kindpats, globsuffix):
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"""Build a match function from a list of kinds and kindpats,
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return regexp string and a matcher function."""
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try:
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regex = '(?:%s)' % '|'.join([_regex(k, p, globsuffix)
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for (k, p) in kindpats])
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if len(regex) > 20000:
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raise OverflowError
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return regex, _rematcher(regex)
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except OverflowError:
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# We're using a Python with a tiny regex engine and we
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# made it explode, so we'll divide the pattern list in two
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# until it works
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l = len(kindpats)
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if l < 2:
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raise
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regexa, a = _buildregexmatch(kindpats[:l//2], globsuffix)
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regexb, b = _buildregexmatch(kindpats[l//2:], globsuffix)
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return regex, lambda s: a(s) or b(s)
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except re.error:
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for k, p in kindpats:
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try:
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_rematcher('(?:%s)' % _regex(k, p, globsuffix))
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except re.error:
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raise util.Abort(_("invalid pattern (%s): %s") % (k, p))
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raise util.Abort(_("invalid pattern"))
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def _normalize(patterns, default, root, cwd, auditor):
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'''Convert 'kind:pat' from the patterns list to tuples with kind and
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normalized and rooted patterns and with listfiles expanded.'''
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kindpats = []
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for kind, pat in [_patsplit(p, default) for p in patterns]:
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if kind in ('glob', 'relpath'):
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pat = pathutil.canonpath(root, cwd, pat, auditor)
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elif kind in ('relglob', 'path'):
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pat = util.normpath(pat)
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elif kind in ('listfile', 'listfile0'):
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try:
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files = util.readfile(pat)
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if kind == 'listfile0':
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files = files.split('\0')
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else:
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files = files.splitlines()
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files = [f for f in files if f]
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except EnvironmentError:
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raise util.Abort(_("unable to read file list (%s)") % pat)
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kindpats += _normalize(files, default, root, cwd, auditor)
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continue
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# else: re or relre - which cannot be normalized
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kindpats.append((kind, pat))
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return kindpats
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def _roots(kindpats):
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'''return roots and exact explicitly listed files from patterns
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>>> _roots([('glob', 'g/*'), ('glob', 'g'), ('glob', 'g*')])
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['g', 'g', '.']
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>>> _roots([('relpath', 'r'), ('path', 'p/p'), ('path', '')])
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['r', 'p/p', '.']
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>>> _roots([('relglob', 'rg*'), ('re', 're/'), ('relre', 'rr')])
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['.', '.', '.']
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'''
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r = []
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for kind, pat in kindpats:
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if kind == 'glob': # find the non-glob prefix
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root = []
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for p in pat.split('/'):
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if '[' in p or '{' in p or '*' in p or '?' in p:
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break
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root.append(p)
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r.append('/'.join(root) or '.')
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elif kind in ('relpath', 'path'):
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r.append(pat or '.')
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else: # relglob, re, relre
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r.append('.')
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return r
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def _anypats(kindpats):
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for kind, pat in kindpats:
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if kind in ('glob', 're', 'relglob', 'relre', 'set'):
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return True
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