view mercurial/match.py @ 8330:7de68012f86e

Windows: improve performance via buffered I/O

The posixfile_nt code hits the win32 file API directly, which
essentially amounts to performing a system call for every read and
write. This is slow.

We add a C extension that lets us use a Python file object instead,
but preserve our desired POSIX-like semantics (the ability to rename
or delete a file that is being accessed).

If the C extension is not available (e.g. in a VPS environment
without a compiler), we fall back to the posixfile_nt code.

# match.py - file name matching
#
#  Copyright 2008, 2009 Matt Mackall <[e-mail]> 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 util

class _match(object):
    def __init__(self, root, cwd, files, mf, ap):
        self._root = root
        self._cwd = cwd
        self._files = files
        self._fmap = set(files)
        self.matchfn = mf
        self._anypats = ap
    def __call__(self, fn):
        return self.matchfn(fn)
    def __iter__(self):
        for f in self._files:
            yield f
    def bad(self, f, msg):
        return True
    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 always(_match):
    def __init__(self, root, cwd):
        _match.__init__(self, root, cwd, [], lambda f: True, False)

class never(_match):
    def __init__(self, root, cwd):
        _match.__init__(self, root, cwd, [], lambda f: False, False)

class exact(_match):
    def __init__(self, root, cwd, files):
        _match.__init__(self, root, cwd, files, lambda f: f in files, False)

class match(_match):
    def __init__(self, root, cwd, patterns, include, exclude, default):
        f, mf, ap = util.matcher(root, cwd, patterns, include, exclude,
                                 None, default)
        _match.__init__(self, root, cwd, f, mf, ap)