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)