mirror of
https://github.com/facebook/sapling.git
synced 2024-10-09 16:31:02 +03:00
712df54e55
For a pathological .hgignore with over 2500 glob lines and over 200000 calls to re.escape, and with re2 available, this speeds up parsing the .hgignore from 0.75 seconds to 0.20 seconds. This causes e.g. 'hg status' with hgwatchman enabled to go from 1.02 seconds to 0.47 seconds.
417 lines
13 KiB
Python
417 lines
13 KiB
Python
# 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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if include:
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kindpats = _normalize(include, 'glob', root, cwd, auditor)
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self.includepat, im = _buildmatch(ctx, kindpats, '(?:/|$)')
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if exclude:
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kindpats = _normalize(exclude, 'glob', root, cwd, auditor)
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self.excludepat, em = _buildmatch(ctx, kindpats, '(?:/|$)')
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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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pm = 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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if patterns or exact:
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if include:
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if exclude:
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m = lambda f: im(f) and not em(f) and pm(f)
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else:
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m = lambda f: im(f) and pm(f)
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else:
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if exclude:
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m = lambda f: not em(f) and pm(f)
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else:
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m = pm
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else:
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if include:
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if exclude:
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m = lambda f: im(f) and not em(f)
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else:
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m = im
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else:
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if exclude:
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m = lambda f: not em(f)
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else:
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m = lambda f: True
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self._always = 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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self._always = True
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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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