249 lines
7.5 KiB
Python
249 lines
7.5 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, incorporated herein by reference.
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import re
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import util
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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):
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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
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exclude - patterns to exclude
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default - if a pattern in names has no explicit type, assume this one
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exact - patterns are actually literals
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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 canonroot
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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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'<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 = []
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self._anypats = bool(include or exclude)
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if include:
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im = _buildmatch(_normalize(include, 'glob', root, cwd), '(?:/|$)')
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if exclude:
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em = _buildmatch(_normalize(exclude, 'glob', root, cwd), '(?:/|$)')
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if exact:
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self._files = patterns
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pm = self.exact
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elif patterns:
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pats = _normalize(patterns, default, root, cwd)
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self._files = _roots(pats)
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self._anypats = self._anypats or _anypats(pats)
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pm = _buildmatch(pats, '$')
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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.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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def bad(self, f, msg):
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'''callback for each explicit file that can't be
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found/accessed, with an error message
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'''
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pass
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def dir(self, f):
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pass
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def missing(self, f):
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pass
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def exact(self, f):
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return f in self._fmap
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def rel(self, f):
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return util.pathto(self._root, self._cwd, f)
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def files(self):
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return self._files
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def anypats(self):
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return self._anypats
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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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def patkind(pat):
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return _patsplit(pat, None)[0]
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def _patsplit(pat, default):
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"""Split a string into an optional pattern kind prefix and the
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actual pattern."""
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if ':' in pat:
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kind, val = pat.split(':', 1)
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if kind in ('re', 'glob', 'path', 'relglob', 'relpath', 'relre'):
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return kind, val
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return default, pat
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def _globre(pat):
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"convert a glob pattern into a regexp"
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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 = re.escape
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def peek(): 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 = 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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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, name, tail):
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'''convert a pattern into a regular expression'''
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if not name:
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return ''
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if kind == 're':
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return name
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elif kind == 'path':
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return '^' + re.escape(name) + '(?:/|$)'
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elif kind == 'relglob':
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return '(?:|.*/)' + _globre(name) + tail
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elif kind == 'relpath':
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return re.escape(name) + '(?:/|$)'
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elif kind == 'relre':
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if name.startswith('^'):
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return name
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return '.*' + name
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return _globre(name) + tail
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def _buildmatch(pats, tail):
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"""build a matching function from a set of patterns"""
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try:
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pat = '(?:%s)' % '|'.join([_regex(k, p, tail) for (k, p) in pats])
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if len(pat) > 20000:
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raise OverflowError()
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return re.compile(pat).match
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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(pats)
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if l < 2:
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raise
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a, b = _buildmatch(pats[:l//2], tail), _buildmatch(pats[l//2:], tail)
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return lambda s: a(s) or b(s)
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except re.error:
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for k, p in pats:
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try:
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re.compile('(?:%s)' % _regex(k, p, tail))
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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(names, default, root, cwd):
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pats = []
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for kind, name in [_patsplit(p, default) for p in names]:
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if kind in ('glob', 'relpath'):
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name = util.canonpath(root, cwd, name)
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elif kind in ('relglob', 'path'):
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name = util.normpath(name)
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pats.append((kind, name))
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return pats
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def _roots(patterns):
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r = []
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for kind, name in patterns:
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if kind == 'glob': # find the non-glob prefix
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root = []
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for p in name.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(name or '.')
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elif kind == 'relglob':
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r.append('.')
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return r
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def _anypats(patterns):
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for kind, name in patterns:
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if kind in ('glob', 're', 'relglob', 'relre'):
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return True
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