ref: 7f2599254a29c956ac3cdbfc28792a8290312c13
dir: /sys/src/cmd/hg/mercurial/match.py/
# match.py - filename matching
#
# Copyright 2008, 2009 Matt Mackall <[email protected]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
import re
import util
class match(object):
def __init__(self, root, cwd, patterns, include=[], exclude=[],
default='glob', exact=False):
"""build an object to match a set of file patterns
arguments:
root - the canonical root of the tree you're matching against
cwd - the current working directory, if relevant
patterns - patterns to find
include - patterns to include
exclude - patterns to exclude
default - if a pattern in names has no explicit type, assume this one
exact - patterns are actually literals
a pattern is one of:
'glob:<glob>' - a glob relative to cwd
're:<regexp>' - a regular expression
'path:<path>' - a path relative to canonroot
'relglob:<glob>' - an unrooted glob (*.c matches C files in all dirs)
'relpath:<path>' - a path relative to cwd
'relre:<regexp>' - a regexp that needn't match the start of a name
'<something>' - a pattern of the specified default type
"""
self._root = root
self._cwd = cwd
self._files = []
self._anypats = bool(include or exclude)
if include:
im = _buildmatch(_normalize(include, 'glob', root, cwd), '(?:/|$)')
if exclude:
em = _buildmatch(_normalize(exclude, 'glob', root, cwd), '(?:/|$)')
if exact:
self._files = patterns
pm = self.exact
elif patterns:
pats = _normalize(patterns, default, root, cwd)
self._files = _roots(pats)
self._anypats = self._anypats or _anypats(pats)
pm = _buildmatch(pats, '$')
if patterns or exact:
if include:
if exclude:
m = lambda f: im(f) and not em(f) and pm(f)
else:
m = lambda f: im(f) and pm(f)
else:
if exclude:
m = lambda f: not em(f) and pm(f)
else:
m = pm
else:
if include:
if exclude:
m = lambda f: im(f) and not em(f)
else:
m = im
else:
if exclude:
m = lambda f: not em(f)
else:
m = lambda f: True
self.matchfn = m
self._fmap = set(self._files)
def __call__(self, fn):
return self.matchfn(fn)
def __iter__(self):
for f in self._files:
yield f
def bad(self, f, msg):
'''callback for each explicit file that can't be
found/accessed, with an error message
'''
pass
def dir(self, f):
pass
def missing(self, f):
pass
def exact(self, f):
return f in self._fmap
def rel(self, f):
return util.pathto(self._root, self._cwd, f)
def files(self):
return self._files
def anypats(self):
return self._anypats
class exact(match):
def __init__(self, root, cwd, files):
match.__init__(self, root, cwd, files, exact = True)
class always(match):
def __init__(self, root, cwd):
match.__init__(self, root, cwd, [])
def patkind(pat):
return _patsplit(pat, None)[0]
def _patsplit(pat, default):
"""Split a string into an optional pattern kind prefix and the
actual pattern."""
if ':' in pat:
kind, val = pat.split(':', 1)
if kind in ('re', 'glob', 'path', 'relglob', 'relpath', 'relre'):
return kind, val
return default, pat
def _globre(pat):
"convert a glob pattern into a regexp"
i, n = 0, len(pat)
res = ''
group = 0
escape = re.escape
def peek(): return i < n and pat[i]
while i < n:
c = pat[i]
i = i+1
if c not in '*?[{},\\':
res += escape(c)
elif c == '*':
if peek() == '*':
i += 1
res += '.*'
else:
res += '[^/]*'
elif c == '?':
res += '.'
elif c == '[':
j = i
if j < n and pat[j] in '!]':
j += 1
while j < n and pat[j] != ']':
j += 1
if j >= n:
res += '\\['
else:
stuff = pat[i:j].replace('\\','\\\\')
i = j + 1
if stuff[0] == '!':
stuff = '^' + stuff[1:]
elif stuff[0] == '^':
stuff = '\\' + stuff
res = '%s[%s]' % (res, stuff)
elif c == '{':
group += 1
res += '(?:'
elif c == '}' and group:
res += ')'
group -= 1
elif c == ',' and group:
res += '|'
elif c == '\\':
p = peek()
if p:
i += 1
res += escape(p)
else:
res += escape(c)
else:
res += escape(c)
return res
def _regex(kind, name, tail):
'''convert a pattern into a regular expression'''
if not name:
return ''
if kind == 're':
return name
elif kind == 'path':
return '^' + re.escape(name) + '(?:/|$)'
elif kind == 'relglob':
return '(?:|.*/)' + _globre(name) + tail
elif kind == 'relpath':
return re.escape(name) + '(?:/|$)'
elif kind == 'relre':
if name.startswith('^'):
return name
return '.*' + name
return _globre(name) + tail
def _buildmatch(pats, tail):
"""build a matching function from a set of patterns"""
try:
pat = '(?:%s)' % '|'.join([_regex(k, p, tail) for (k, p) in pats])
if len(pat) > 20000:
raise OverflowError()
return re.compile(pat).match
except OverflowError:
# We're using a Python with a tiny regex engine and we
# made it explode, so we'll divide the pattern list in two
# until it works
l = len(pats)
if l < 2:
raise
a, b = _buildmatch(pats[:l//2], tail), _buildmatch(pats[l//2:], tail)
return lambda s: a(s) or b(s)
except re.error:
for k, p in pats:
try:
re.compile('(?:%s)' % _regex(k, p, tail))
except re.error:
raise util.Abort("invalid pattern (%s): %s" % (k, p))
raise util.Abort("invalid pattern")
def _normalize(names, default, root, cwd):
pats = []
for kind, name in [_patsplit(p, default) for p in names]:
if kind in ('glob', 'relpath'):
name = util.canonpath(root, cwd, name)
elif kind in ('relglob', 'path'):
name = util.normpath(name)
pats.append((kind, name))
return pats
def _roots(patterns):
r = []
for kind, name in patterns:
if kind == 'glob': # find the non-glob prefix
root = []
for p in name.split('/'):
if '[' in p or '{' in p or '*' in p or '?' in p:
break
root.append(p)
r.append('/'.join(root) or '.')
elif kind in ('relpath', 'path'):
r.append(name or '.')
elif kind == 'relglob':
r.append('.')
return r
def _anypats(patterns):
for kind, name in patterns:
if kind in ('glob', 're', 'relglob', 'relre'):
return True