# Source code for _pytest.mark

    """ generic mechanism for marking and selecting python functions. """
    import inspect

    class MarkerError(Exception):

        """Error in use of a pytest marker/attribute."""

    def pytest_namespace():
        return {'mark': MarkGenerator()}

    def pytest_addoption(parser):
        group = parser.getgroup("general")
        group._addoption(
            '-k',
            action="store", dest="keyword", default='', metavar="EXPRESSION",
            help="only run tests which match the given substring expression. "
                 "An expression is a python evaluatable expression "
                 "where all names are substring-matched against test names "
                 "and their parent classes. Example: -k 'test_method or test "
                 "other' matches all test functions and classes whose name "
                 "contains 'test_method' or 'test_other'. "
                 "Additionally keywords are matched to classes and functions "
                 "containing extra names in their 'extra_keyword_matches' set, "
                 "as well as functions which have names assigned directly to them."
        )

        group._addoption(
            "-m",
            action="store", dest="markexpr", default="", metavar="MARKEXPR",
            help="only run tests matching given mark expression.  "
                 "example: -m 'mark1 and not mark2'."
        )

        group.addoption(
            "--markers", action="store_true",
            help="show markers (builtin, plugin and per-project ones)."
        )

        parser.addini("markers", "markers for test functions", 'linelist')

    def pytest_cmdline_main(config):
        import _pytest.config
        if config.option.markers:
            config._do_configure()
            tw = _pytest.config.create_terminal_writer(config)
            for line in config.getini("markers"):
                name, rest = line.split(":", 1)
                tw.write("@pytest.mark.%s:" % name, bold=True)
                tw.line(rest)
                tw.line()
            config._ensure_unconfigure()
            return 0
    pytest_cmdline_main.tryfirst = True

    def pytest_collection_modifyitems(items, config):
        keywordexpr = config.option.keyword
        matchexpr = config.option.markexpr
        if not keywordexpr and not matchexpr:
            return
        # pytest used to allow "-" for negating
        # but today we just allow "-" at the beginning, use "not" instead
        # we probably remove "-" alltogether soon
        if keywordexpr.startswith("-"):
            keywordexpr = "not " + keywordexpr[1:]
        selectuntil = False
        if keywordexpr[-1:] == ":":
            selectuntil = True
            keywordexpr = keywordexpr[:-1]

        remaining = []
        deselected = []
        for colitem in items:
            if keywordexpr and not matchkeyword(colitem, keywordexpr):
                deselected.append(colitem)
            else:
                if selectuntil:
                    keywordexpr = None
                if matchexpr:
                    if not matchmark(colitem, matchexpr):
                        deselected.append(colitem)
                        continue
                remaining.append(colitem)

        if deselected:
            config.hook.pytest_deselected(items=deselected)
            items[:] = remaining

    class MarkMapping:
        """Provides a local mapping for markers where item access
        resolves to True if the marker is present. """
        def __init__(self, keywords):
            mymarks = set()
            for key, value in keywords.items():
                if isinstance(value, MarkInfo) or isinstance(value, MarkDecorator):
                    mymarks.add(key)
            self._mymarks = mymarks

        def __getitem__(self, name):
            return name in self._mymarks

    class KeywordMapping:
        """Provides a local mapping for keywords.
        Given a list of names, map any substring of one of these names to True.
        """
        def __init__(self, names):
            self._names = names

        def __getitem__(self, subname):
            for name in self._names:
                if subname in name:
                    return True
            return False

    def matchmark(colitem, markexpr):
        """Tries to match on any marker names, attached to the given colitem."""
        return eval(markexpr, {}, MarkMapping(colitem.keywords))

    def matchkeyword(colitem, keywordexpr):
        """Tries to match given keyword expression to given collector item.

        Will match on the name of colitem, including the names of its parents.
        Only matches names of items which are either a :class:`Class` or a
        :class:`Function`.
        Additionally, matches on names in the 'extra_keyword_matches' set of
        any item, as well as names directly assigned to test functions.
        """
        mapped_names = set()

        # Add the names of the current item and any parent items
        import pytest
        for item in colitem.listchain():
            if not isinstance(item, pytest.Instance):
                mapped_names.add(item.name)

        # Add the names added as extra keywords to current or parent items
        for name in colitem.listextrakeywords():
            mapped_names.add(name)

        # Add the names attached to the current function through direct assignment
        if hasattr(colitem, 'function'):
            for name in colitem.function.__dict__:
                mapped_names.add(name)

        mapping = KeywordMapping(mapped_names)
        if " " not in keywordexpr:
            # special case to allow for simple "-k pass" and "-k 1.3"
            return mapping[keywordexpr]
        elif keywordexpr.startswith("not ") and " " not in keywordexpr[4:]:
            return not mapping[keywordexpr[4:]]
        return eval(keywordexpr, {}, mapping)

    def pytest_configure(config):
        import pytest
        if config.option.strict:
            pytest.mark._config = config

    class MarkGenerator:
        """ Factory for :class:`MarkDecorator` objects - exposed as
        a ``pytest.mark`` singleton instance.  Example::

             import py
             @pytest.mark.slowtest
             def test_function():
                pass

        will set a 'slowtest' :class:`MarkInfo` object
        on the ``test_function`` object. """

        def __getattr__(self, name):
            if name[0] == "_":
                raise AttributeError("Marker name must NOT start with underscore")
            if hasattr(self, '_config'):
                self._check(name)
            return MarkDecorator(name)

        def _check(self, name):
            try:
                if name in self._markers:
                    return
            except AttributeError:
                pass
            self._markers = l = set()
            for line in self._config.getini("markers"):
                beginning = line.split(":", 1)
                x = beginning[0].split("(", 1)[0]
                l.add(x)
            if name not in self._markers:
                raise AttributeError("%r not a registered marker" % (name,))

    def istestfunc(func):
        return hasattr(func, "__call__") and \
            getattr(func, "__name__", "<lambda>") != "<lambda>"

    class MarkDecorator:
        """ A decorator for test functions and test classes.  When applied
        it will create :class:`MarkInfo` objects which may be
        :ref:`retrieved by hooks as item keywords <excontrolskip>`.
        MarkDecorator instances are often created like this::

            mark1 = pytest.mark.NAME              # simple MarkDecorator
            mark2 = pytest.mark.NAME(name1=value) # parametrized MarkDecorator

        and can then be applied as decorators to test functions::

            @mark2
            def test_function():
                pass

        When a MarkDecorator instance is called it does the following:
          1. If called with a single class as its only positional argument and no
             additional keyword arguments, it attaches itself to the class so it
             gets applied automatically to all test cases found in that class.
          2. If called with a single function as its only positional argument and
             no additional keyword arguments, it attaches a MarkInfo object to the
             function, containing all the arguments already stored internally in
             the MarkDecorator.
          3. When called in any other case, it performs a 'fake construction' call,
             i.e. it returns a new MarkDecorator instance with the original
             MarkDecorator's content updated with the arguments passed to this
             call.

        Note: The rules above prevent MarkDecorator objects from storing only a
        single function or class reference as their positional argument with no
        additional keyword or positional arguments.

        """
        def __init__(self, name, args=None, kwargs=None):
            self.name = name
            self.args = args or ()
            self.kwargs = kwargs or {}

        @property
        def markname(self):
            return self.name # for backward-compat (2.4.1 had this attr)

        def __repr__(self):
            d = self.__dict__.copy()
            name = d.pop('name')
            return "<MarkDecorator %r %r>" % (name, d)

        def __call__(self, *args, **kwargs):
            """ if passed a single callable argument: decorate it with mark info.
                otherwise add *args/**kwargs in-place to mark information. """
            if args and not kwargs:
                func = args[0]
                is_class = inspect.isclass(func)
                if len(args) == 1 and (istestfunc(func) or is_class):
                    if is_class:
                        if hasattr(func, 'pytestmark'):
                            mark_list = func.pytestmark
                            if not isinstance(mark_list, list):
                                mark_list = [mark_list]
                            # always work on a copy to avoid updating pytestmark
                            # from a superclass by accident
                            mark_list = mark_list + [self]
                            func.pytestmark = mark_list
                        else:
                            func.pytestmark = [self]
                    else:
                        holder = getattr(func, self.name, None)
                        if holder is None:
                            holder = MarkInfo(
                                self.name, self.args, self.kwargs
                            )
                            setattr(func, self.name, holder)
                        else:
                            holder.add(self.args, self.kwargs)
                    return func
            kw = self.kwargs.copy()
            kw.update(kwargs)
            args = self.args + args
            return self.__class__(self.name, args=args, kwargs=kw)

    class MarkInfo:
        """ Marking object created by :class:`MarkDecorator` instances. """
        def __init__(self, name, args, kwargs):
            #: name of attribute
            self.name = name
            #: positional argument list, empty if none specified
            self.args = args
            #: keyword argument dictionary, empty if nothing specified
            self.kwargs = kwargs.copy()
            self._arglist = [(args, kwargs.copy())]

        def __repr__(self):
            return "<MarkInfo %r args=%r kwargs=%r>" % (
                self.name, self.args, self.kwargs
            )

        def add(self, args, kwargs):
            """ add a MarkInfo with the given args and kwargs. """
            self._arglist.append((args, kwargs))
            self.args += args
            self.kwargs.update(kwargs)

        def __iter__(self):
            """ yield MarkInfo objects each relating to a marking-call. """
            for args, kwargs in self._arglist:
                yield MarkInfo(self.name, args, kwargs)