def get_lexer_for_filename(_fn, code=None, **options):
    """
    Get a lexer for a filename.  If multiple lexers match the filename
    pattern, use ``analyze_text()`` to figure out which one is more
    appropriate.
    """
    matches = []
    fn = basename(_fn)
    for modname, name, _, filenames, _ in LEXERS.itervalues():
        for filename in filenames:
            if fnmatch.fnmatch(fn, filename):
                if name not in _lexer_cache:
                    _load_lexers(modname)
                matches.append(_lexer_cache[name])
    for cls in find_plugin_lexers():
        for filename in cls.filenames:
            if fnmatch.fnmatch(fn, filename):
                matches.append(cls)

    def get_rating(cls):
        # The class _always_ defines analyse_text because it's included in
        # the Lexer class.  The default implementation returns None which
        # gets turned into 0.0.  Run scripts/detect_missing_analyse_text.py
        # to find lexers which need it overridden.
        d = cls.analyse_text(code)
        #print "Got %r from %r" % (d, cls)
        return d

    if code:
        matches.sort(key=get_rating)
    if matches:
        #print "Possible lexers, after sort:", matches
        return matches[-1](**options)
    raise ClassNotFound('no lexer for filename %r found' % _fn)

def get_all_lexers():
    from pygments.lexers._mapping import LEXERS
    from pygments.plugin import find_plugin_lexers

    for item in LEXERS.itervalues():
        yield item[1:]
    for cls in find_plugin_lexers():
        yield cls.name, cls.aliases, cls.filenames, cls.mimetypes

def get_all_lexers():
    """Return a generator of tuples in the form ``(name, aliases,
    filenames, mimetypes)`` of all know lexers.
    """
    for item in itervalues(LEXERS):
        yield item[1:]
    for lexer in find_plugin_lexers():
        yield lexer.name, lexer.aliases, lexer.filenames, lexer.mimetypes

def _iter_lexerclasses(plugins=True):
    """Return an iterator over all lexer classes."""
    for key in sorted(LEXERS):
        module_name, name = LEXERS[key][:2]
        if name not in _lexer_cache:
            _load_lexers(module_name)
        yield _lexer_cache[name]
    if plugins:
        for lexer in find_plugin_lexers():
            yield lexer

def _iter_lexerclasses():
    """
    Return an iterator over all lexer classes.
    """
    for module_name, name, _, _, _ in LEXERS.itervalues():
        if name not in _lexer_cache:
            _load_lexers(module_name)
        yield _lexer_cache[name]
    for lexer in find_plugin_lexers():
        yield lexer

def get_lexer_for_mimetype(_mime, **options):
    """
    Get a lexer for a mimetype.
    """
    for modname, name, _, _, mimetypes in LEXERS.itervalues():
        if _mime in mimetypes:
            if name not in _lexer_cache:
                _load_lexers(modname)
            return _lexer_cache[name](**options)
    for cls in find_plugin_lexers():
        if _mime in cls.mimetypes:
            return cls(**options)
    raise ClassNotFound('no lexer for mimetype %r found' % _mime)

def get_lexer_by_name(_alias, **options):
    """
    Get a lexer by an alias.
    """
    # lookup builtin lexers
    for module_name, name, aliases, _, _ in LEXERS.itervalues():
        if _alias in aliases:
            if name not in _lexer_cache:
                _load_lexers(module_name)
            return _lexer_cache[name](**options)
    # continue with lexers from setuptools entrypoints
    for cls in find_plugin_lexers():
        if _alias in cls.aliases:
            return cls(**options)
    raise ClassNotFound('no lexer for alias %r found' % _alias)

def find_lexer_class(name):
    """
    Lookup a lexer class by name. Return None if not found.
    """
    if name in _lexer_cache:
        return _lexer_cache[name]
    # lookup builtin lexers
    for module_name, lname, aliases, _, _ in LEXERS.itervalues():
        if name == lname:
            _load_lexers(module_name)
            return _lexer_cache[name]
    # continue with lexers from setuptools entrypoints
    for cls in find_plugin_lexers():
        if cls.name == name:
            return cls

def get_lexer_for_filename(_fn, **options):
    """
    Get a lexer for a filename.
    """
    fn = basename(_fn)
    for modname, name, _, filenames, _ in LEXERS.itervalues():
        for filename in filenames:
            if fnmatch.fnmatch(fn, filename):
                if name not in _lexer_cache:
                    _load_lexers(modname)
                return _lexer_cache[name](**options)
    for cls in find_plugin_lexers():
        for filename in cls.filenames:
            if fnmatch.fnmatch(fn, filename):
                return cls(**options)
    raise ClassNotFound('no lexer for filename %r found' % _fn)

def find_lexer_class_by_name(alias):
    """Lookup a lexer class by alias.

    Like `get_lexer_by_name`, but does not instantiate the class.

    .. versionadded:: 2.2
    """
    if not _alias:
        raise ClassNotFound('no lexer for alias %r found' % _alias)
    # lookup builtin lexers
    for module_name, name, aliases, _, _ in itervalues(LEXERS):
        if _alias.lower() in aliases:
            if name not in _lexer_cache:
                _load_lexers(module_name)
            return _lexer_cache[name]
    # continue with lexers from setuptools entrypoints
    for cls in find_plugin_lexers():
        if _alias.lower() in cls.aliases:
            return cls
    raise ClassNotFound('no lexer for alias %r found' % _alias)

def find_lexer_class_for_filename(_fn, code=None):
    """Get a lexer for a filename.

    If multiple lexers match the filename pattern, use ``analyse_text()`` to
    figure out which one is more appropriate.

    Returns None if not found.
    """
    matches = []
    fn = basename(_fn)
    for modname, name, _, filenames, _ in itervalues(LEXERS):
        for filename in filenames:
            if _fn_matches(fn, filename):
                if name not in _lexer_cache:
                    _load_lexers(modname)
                matches.append((_lexer_cache[name], filename))
    for cls in find_plugin_lexers():
        for filename in cls.filenames:
            if _fn_matches(fn, filename):
                matches.append((cls, filename))

    if sys.version_info > (3,) and isinstance(code, bytes):
        # decode it, since all analyse_text functions expect unicode
        code = code.decode('latin1')

    def get_rating(info):
        cls, filename = info
        # explicit patterns get a bonus
        bonus = '*' not in filename and 0.5 or 0
        # The class _always_ defines analyse_text because it's included in
        # the Lexer class.  The default implementation returns None which
        # gets turned into 0.0.  Run scripts/detect_missing_analyse_text.py
        # to find lexers which need it overridden.
        if code:
            return cls.analyse_text(code) + bonus
        return cls.priority + bonus

    if matches:
        matches.sort(key=get_rating)
        # print "Possible lexers, after sort:", matches
        return matches[-1][0]

def _iter_lexerinfo():
    for info in LEXERS.itervalues():
        yield info
    for cls in find_plugin_lexers():
        yield cls.__module__, cls.name, cls.aliases, cls.filenames, cls.mimetypes

    """
    Copy of pygments.plugins.find_plugin_lexers to avoid RequirementParseError
    (issue introduced in setuptools 20.2)
    """
    if pkg_resources is None:
        return
    for entrypoint in pkg_resources.iter_entry_points('pygments.lexers'):
        try:
            yield entrypoint.load()
        except pkg_resources.RequirementParseError:
            continue
from pygments import plugin  # noqa
plugin.find_plugin_lexers = find_plugin_lexers
# execute it once to make sure the cache is built using our monkeypatched
# function
list(plugin.find_plugin_lexers())


def load():
    """
    Loads user defined mimetypes and extension into standard module.

    This function is called once on startup by the application and can be
    called later to update the mimetypes db.
    """
    string = QtCore.QSettings().value('editor/mimetypes', '{}')
    db = json.loads(string)
    if not db:
        db = _get_default_mimetypes()
        QtCore.QSettings().setValue('editor/mimetypes', json.dumps(db))
    for mimetype, exts in db.items():