def __guessLexer( self ):
        """ Guesses a pygments lexer """

        self.__lexerGuessed = True
        if self.__pygmentsName:
            lexerClass = find_lexer_class( self.__pygmentsName )
            if lexerClass is not None:
                self.__language = "Guessed: " + lexerClass.name
                return lexerClass()
        else:
            # Unfortunately, guessing a lexer by text lead to unpredictable
            # behaviour in some cases. E.g. national non-english characters
            # are mis-displayed or even core dump is generated. So the part
            # of guessing by text has been removed.
            if self.editor is not None:
                if self.__fileName != "":
                    filename = self.__fileName
                else:
                    filename = self.editor.getFileName()

                try:
                    lexerClass = get_lexer_for_filename( filename )
                    self.__language = "Guessed: " + lexerClass.name
                    return lexerClass
                except ClassNotFound:
                    pass

        # Last resort - text only
        lexerClass = find_lexer_class( "Text only" )
        if lexerClass is not None:
            self.__language = "Guessed: " + lexerClass.name
            return lexerClass()
        return None

    def serialize(self, highlight_code=False):
        """
        Convert the codelet into a dictionary that can be sent as JSON.

        :param highlight_code: Whether to return code as pygments-highlighted
            HTML or as plain source.
        :type highlight_code: bool

        :return: The codelet as a dictionary.
        :rtype: str
        """
        lang = LANGS[self.language]
        code = self.code
        if highlight_code:
            lexer = find_lexer_class(lang)() or get_lexer_by_name("text")
            symbols = reduce(concat, self.symbols.values(), [])
            lines = reduce(concat, [[loc[0] for loc in sym[1] + sym[2]]
                                    for sym in symbols], [])
            formatter = HtmlFormatter(linenos=True, hl_lines=lines)
            code = highlight(code, lexer, formatter)

        return {
            "name": self.name, "code": code, "lang": lang,
            "authors": self.authors, "url": self.url,
            "created": self.date_created.isoformat(),
            "modified": self.date_modified.isoformat(), "origin": self.origin
        }

def test_get_lexers():
    # test that the lexers functions work
    def verify(func, args):
        x = func(opt='val', *args)
        assert isinstance(x, lexers.PythonLexer)
        assert x.options["opt"] == "val"

    for func, args in [(lexers.get_lexer_by_name, ("python",)),
                       (lexers.get_lexer_for_filename, ("test.py",)),
                       (lexers.get_lexer_for_mimetype, ("text/x-python",)),
                       (lexers.guess_lexer, ("#!/usr/bin/python -O\nprint",)),
                       (lexers.guess_lexer_for_filename, ("a.py", "<%= @foo %>"))
                       ]:
        yield verify, func, args

    for cls, (_, lname, aliases, _, mimetypes) in lexers.LEXERS.items():
        assert cls == lexers.find_lexer_class(lname).__name__

        for alias in aliases:
            assert cls == lexers.get_lexer_by_name(alias).__class__.__name__

        for mimetype in mimetypes:
            assert cls == lexers.get_lexer_for_mimetype(mimetype).__class__.__name__

    try:
        lexers.get_lexer_by_name(None)
    except ClassNotFound:
        pass
    else:
        raise Exception

 def __guessLexer(self, text):
     """
     Private method to guess a pygments lexer.
     
     @param text text to base guessing on (string)
     @return reference to the guessed lexer (pygments.lexer)
     """
     lexer = None
     
     if self.__pygmentsName:
         lexerClass = find_lexer_class(self.__pygmentsName)
         if lexerClass is not None:
             lexer = lexerClass()
     
     elif text:
         # step 1: guess based on filename and text
         if self.editor is not None:
             fn = self.editor.getFileName()
             if fn:
                 try:
                     lexer = guess_lexer_for_filename(fn, text)
                 except ClassNotFound:
                     pass
         
         # step 2: guess on text only
         if lexer is None:
             try:
                 lexer = guess_lexer(text)
             except ClassNotFound:
                 pass
     
     return lexer

    def lexer(self):
        """
        Internal: Get the lexer of the blob.

        Returns a Lexer.
        """
        return self.language.lexer if self.language else lexers.find_lexer_class('Text only')

def view(paste_id):
    model = Paste.query.get_or_404(paste_id)
    output = request.args.get('output', None)
    if output == 'raw':
        resp = make_response(model.content, 200)
        resp.headers['Content-Type'] = 'text/plain; charset=utf-8'
        return resp
    user = getUserObject()
    form = CommentForm(request.form, csrf_enabled=False)
    if request.method == 'POST':
        if user:
            if form.validate():
                content, users = get_usernames_from_comment(form.content.data)
                comment = PasteComment(user.id, model.id, content)
                model.comment_num = model.comment_num + 1
                if user.id != model.user_id:
                    if user not in model.followers:
                        model.followers.append(user)
                db.session.add(comment)
                mt = MessageTemplate.query.filter_by(used_for='new_comment').first()
                if mt:
                    if model.followers:
                        for to_user in model.followers:
                            if to_user.id != user.id:
                                message = Message(user.id,
                                                  to_user.id,
                                                  mt.title % model.title,
                                                  mt.content % (model.title, url_for('pasteview.view', paste_id=paste_id)))
                                db.session.add(message)
                mt = MessageTemplate.query.filter_by(used_for='new_comment_has_user').first()
                if mt:
                    if users:
                        for to_user in users:
                            if to_user.id != user.id:
                                message = Message(user.id,
                                                  to_user.id,
                                                  mt.title,
                                                  mt.content % url_for('pasteview.view', paste_id=paste_id))
                                db.session.add(message)
                return redirect(url_for('pasteview.view', paste_id=paste_id))
    updateViewTimes(model, paste_id)
    lexer = find_lexer_class(model.syntax.name)
    formatter = HtmlFormatter(linenos='table', cssclass="source")
    g.code = highlight(model.content, lexer(stripall=True), formatter)
    g.model = model
    g.user = user
    g.form = form
    g.top_users = User.query.order_by('-paste_num')[:PAGE_SIZE]
    g.top_tags = Tag.query.order_by('-times')[:PAGE_SIZE]
    g.syntax_theme = request.args.get('css', app.config.get('DEFAULT_SYNTAX_CSS_FILE'))
    g.css_file = "/static/css/themes/%s.css" % g.syntax_theme
    #g.syntax_themes = SyntaxTheme.get_all_syntax_themes()
    return render('pasteview/view.html')

    def __init__(self, attributes={}):
        # name is required
        if 'name' not in attributes:
            raise KeyError('missing name')
        self.name = attributes['name']

        # Set type
        self.type = attributes.get('type')
        if self.type and self.type not in self.TYPES:
            raise ValueError('invalid type: %s' % self.type)

        self.color = attributes['color']

        # Set aliases
        aliases = attributes.get('aliases', [])
        self.aliases = [self.default_alias_name] + aliases

        # Lookup Lexer object
        lexer = attributes.get('lexer') or self.name
        self.lexer = lexers.find_lexer_class(lexer)
        if not self.lexer:
            raise TypeError('%s is missing lexer' % self.name)

        self.ace_mode = attributes['ace_mode']
        self.wrap = attributes.get('wrap') or False

        # Set legacy search term
        self.search_term = attributes.get('search_term') or self.default_alias_name

        # Set extensions or default to [].
        self.extensions = attributes.get('extensions', [])
        self.filenames = attributes.get('filenames', [])

        self.primary_extension = attributes.get('primary_extension')
        if not self.primary_extension:
            raise KeyError('%s is missing primary extension' % self.name)

        # Prepend primary extension unless its already included
        if self.primary_extension not in self.extensions:
            self.extensions = [self.primary_extension] + self.extensions

        # Set popular, and searchable flags
        self.popular = attributes.get('popular', False)
        self.searchable = attributes.get('searchable', True)

        # If group name is set, save the name so we can lazy load it later
        group_name = attributes.get('group_name')
        if group_name:
            self._group = None
            self.group_name = group_name
        else:
            self._group = self

    def __init__(self, attributes={}):
        # name is required
        if "name" not in attributes.keys():
            raise KeyError("missing name")
        self.name = attributes["name"]

        # Set type
        self.type = attributes.get("type")
        if self.type and self.type not in self.TYPES:
            raise ValueError("invalid type: %s" % self.type)

        self.color = attributes["color"]

        # Set aliases
        aliases = attributes.get("aliases") or []
        self.aliases = [self.default_alias_name] + aliases

        # Lookup Lexer object
        lexer = attributes.get("lexer") or self.name
        self.lexer = lexers.find_lexer_class(lexer)
        if not self.lexer:
            raise TypeError("%s is missing lexer" % self.name)

        self.ace_mode = attributes["ace_mode"]
        self.wrap = attributes.get("wrap") or False

        # Set legacy search term
        self.search_term = attributes.get("search_term") or self.default_alias_name

        # Set extensions or default to [].
        self.extensions = attributes.get("extensions") or []
        self.filenames = attributes.get("filenames") or []

        self.primary_extension = attributes.get("primary_extension")
        if not self.primary_extension:
            raise KeyError("%s is missing primary extension" % self.name)

        # Prepend primary extension unless its already included
        if self.primary_extension not in self.extensions:
            self.extensions = [self.primary_extension] + self.extensions

        # Set popular, and searchable flags
        self.popular = attributes["popular"] if attributes.has_key("popular") else False
        self.searchable = attributes["searchable"] if attributes.has_key("searchable") else True

        # If group name is set, save the name so we can lazy load it later
        group_name = attributes.get("group_name")
        if group_name:
            self._group = None
            self.group_name = group_name
        else:
            self._group = self

def _print_help(what, name):
    try:
        if what == "lexer":
            cls = find_lexer_class(name)
            print("Help on the %s lexer:" % cls.name)
            print(dedent(cls.__doc__))
        elif what == "formatter":
            cls = find_formatter_class(name)
            print("Help on the %s formatter:" % cls.name)
            print(dedent(cls.__doc__))
        elif what == "filter":
            cls = find_filter_class(name)
            print("Help on the %s filter:" % name)
            print(dedent(cls.__doc__))
    except AttributeError:
        print("%s not found!" % what, file=sys.stderr)

def get_pygments_lexer(name):
    name = name.lower()
    if name == 'ipython2':
        from IPython.lib.lexers import IPythonLexer
        return IPythonLexer
    elif name == 'ipython3':
        from IPython.lib.lexers import IPython3Lexer
        return IPython3Lexer
    else:
        for module_name, cls_name, aliases, _, _ in LEXERS.values():
            if name in aliases:
                return find_lexer_class(cls_name)

        warn("No lexer found for language %r. Treating as plain text." % name)
        from pygments.lexers.special import TextLexer
        return TextLexer

def _print_help(what, name):
    try:
        if what == 'lexer':
            cls = find_lexer_class(name)
            print "Help on the %s lexer:" % cls.name
            print dedent(cls.__doc__)
        elif what == 'formatter':
            cls = find_formatter_class(name)
            print "Help on the %s formatter:" % cls.name
            print dedent(cls.__doc__)
        elif what == 'filter':
            cls = find_filter_class(name)
            print "Help on the %s filter:" % name
            print dedent(cls.__doc__)
    except AttributeError:
        print >>sys.stderr, "%s not found!" % what

    def prepare(self):
        super(Pygmentize, self).prepare()

        lexer = None

        # Try very hard to get any lexer

        if self.filename:
            try:
                lexer = get_lexer_for_filename(self.filename, self.source or None, **self.lexer_args)
            except ClassNotFound:
                pass

        if self.lexer_name:
            lexer = find_lexer_class(self.lexer_name)
            if lexer:
                lexer = lexer(**self.lexer_args)

            try:
                lexer = get_lexer_by_name(self.lexer_name, **self.lexer_args)
            except ClassNotFound:
                pass

            try:
                lexer = get_lexer_for_mimetype(self.lexer_name, **self.lexer_args)
            except ClassNotFound:
                pass

        if not lexer:
            # Fallback, so that we at least have line numbering
            lexer = get_lexer_by_name('text', **self.lexer_args)

        formatter_args = dict(self.formatter_args)
        if self.name:
            for k in 'lineanchors', 'linespans':
                if k in formatter_args:
                    formatter_args[k] = self.name + '_' + formatter_args[k]
        formatter_args['style'] = self.style
        formatter_args['noclasses'] = self.noclasses
        formatter = self.formatter_class(**formatter_args)

        self.source = highlight(self.source, lexer, formatter)

def main():
    uses = {}

    for name, aliases, filenames, mimetypes in get_all_lexers():
        cls = find_lexer_class(name)
        for f in filenames:
            if f not in uses:
                uses[f] = []
            uses[f].append(cls)

    ret = 0
    for k, v in uses.iteritems():
        if len(v) > 1:
            #print "Multiple for", k, v
            for i in v:
                if i.analyse_text is None:
                    print i, "has a None analyse_text"
                    ret |= 1
                elif Lexer.analyse_text.__doc__ == i.analyse_text.__doc__:
                    print i, "needs analyse_text, multiple lexers for", k
                    ret |= 2
    return ret

def main(fn, lexer=None, options={}):
    if lexer is not None:
        lxcls = get_lexer_by_name(lexer).__class__
    else:
        lxcls = find_lexer_class_for_filename(os.path.basename(fn))
        if lxcls is None:
            name, rest = fn.split('_', 1)
            lxcls = find_lexer_class(name)
            if lxcls is None:
                raise AssertionError('no lexer found for file %r' % fn)
        print('Using lexer: %s (%s.%s)' % (lxcls.name, lxcls.__module__,
                                           lxcls.__name__))
    debug_lexer = False
    # if profile:
    #     # does not work for e.g. ExtendedRegexLexers
    #     if lxcls.__bases__ == (RegexLexer,):
    #         # yes we can!  (change the metaclass)
    #         lxcls.__class__ = ProfilingRegexLexerMeta
    #         lxcls.__bases__ = (ProfilingRegexLexer,)
    #         lxcls._prof_sort_index = profsort
    # else:
    #     if lxcls.__bases__ == (RegexLexer,):
    #         lxcls.__bases__ = (DebuggingRegexLexer,)
    #         debug_lexer = True
    #     elif lxcls.__bases__ == (DebuggingRegexLexer,):
    #         # already debugged before
    #         debug_lexer = True
    #     else:
    #         # HACK: ExtendedRegexLexer subclasses will only partially work here.
    #         lxcls.__bases__ = (DebuggingRegexLexer,)
    #         debug_lexer = True

    lx = lxcls(**options)
    lno = 1
    if fn == '-':
        text = sys.stdin.read()
    else:
        with open(fn, 'rb') as fp:
            text = fp.read().decode('utf-8')
    text = text.strip('\n') + '\n'
    tokens = []
    states = []

    def show_token(tok, state):
        reprs = list(map(repr, tok))
        print('   ' + reprs[1] + ' ' + ' ' * (29-len(reprs[1])) + reprs[0], end=' ')
        if debug_lexer:
            print(' ' + ' ' * (29-len(reprs[0])) + ' : '.join(state) if state else '', end=' ')
        print()

    for type, val in lx.get_tokens(text):
        lno += val.count('\n')
        if type == Error and not ignerror:
            print('Error parsing', fn, 'on line', lno)
            if not showall:
                print('Previous tokens' + (debug_lexer and ' and states' or '') + ':')
                for i in range(max(len(tokens) - num, 0), len(tokens)):
                    if debug_lexer:
                        show_token(tokens[i], states[i])
                    else:
                        show_token(tokens[i], None)
            print('Error token:')
            l = len(repr(val))
            print('   ' + repr(val), end=' ')
            if debug_lexer and hasattr(lx, 'ctx'):
                print(' ' * (60-l) + ' : '.join(lx.ctx.stack), end=' ')
            print()
            print()
            return 1
        tokens.append((type, val))
        if debug_lexer:
            if hasattr(lx, 'ctx'):
                states.append(lx.ctx.stack[:])
            else:
                states.append(None)
        if showall:
            show_token((type, val), states[-1] if debug_lexer else None)
    return 0

def _discover_lexers():
    import inspect
    from pygments.lexers import get_all_lexers, find_lexer_class

    # maps file extension (and names) to (module, classname) tuples
    default_exts = {
        # C / C++
        ".h": ("pygments.lexers.c_cpp", "CLexer"),
        ".hh": ("pygments.lexers.c_cpp", "CppLexer"),
        ".cp": ("pygments.lexers.c_cpp", "CppLexer"),
        # python
        ".py": ("pygments.lexers.python", "Python3Lexer"),
        ".pyw": ("pygments.lexers.python", "Python3Lexer"),
        ".sc": ("pygments.lexers.python", "Python3Lexer"),
        ".tac": ("pygments.lexers.python", "Python3Lexer"),
        "SConstruct": ("pygments.lexers.python", "Python3Lexer"),
        "SConscript": ("pygments.lexers.python", "Python3Lexer"),
        ".sage": ("pygments.lexers.python", "Python3Lexer"),
        ".pytb": ("pygments.lexers.python", "Python3TracebackLexer"),
        # perl
        ".t": ("pygments.lexers.perl", "Perl6Lexer"),
        ".pl": ("pygments.lexers.perl", "Perl6Lexer"),
        ".pm": ("pygments.lexers.perl", "Perl6Lexer"),
        # asm
        ".s": ("pygments.lexers.asm", "GasLexer"),
        ".S": ("pygments.lexers.asm", "GasLexer"),
        ".asm": ("pygments.lexers.asm", "NasmLexer"),
        ".ASM": ("pygments.lexers.asm", "NasmLexer"),
        # Antlr
        ".g": ("pygments.lexers.parsers", "AntlrCppLexer"),
        ".G": ("pygments.lexers.parsers", "AntlrCppLexer"),
        # XML
        ".xml": ("pygments.lexers.html", "XmlLexer"),
        ".xsl": ("pygments.lexers.html", "XsltLexer"),
        ".xslt": ("pygments.lexers.html", "XsltLexer"),
        # ASP
        ".axd": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        ".asax": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        ".ascx": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        ".ashx": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        ".asmx": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        ".aspx": ("pygments.lexers.dotnet", "CSharpAspxLexer"),
        # misc
        ".b": ("pygments.lexers.esoteric", "BrainfuckLexer"),
        ".j": ("pygments.lexers.jvm", "JasminLexer"),
        ".m": ("pygments.lexers.matlab", "MatlabLexer"),
        ".n": ("pygments.lexers.dotnet", "NemerleLexer"),
        ".p": ("pygments.lexers.pawn", "PawnLexer"),
        ".v": ("pygments.lexers.theorem", "CoqLexer"),
        ".as": ("pygments.lexers.actionscript", "ActionScript3Lexer"),
        ".fs": ("pygments.lexers.forth", "ForthLexer"),
        ".hy": ("pygments.lexers.lisp", "HyLexer"),
        ".ts": ("pygments.lexers.javascript", "TypeScriptLexer"),
        ".rl": ("pygments.lexers.parsers", "RagelCppLexer"),
        ".bas": ("pygments.lexers.basic", "QBasicLexer"),
        ".bug": ("pygments.lexers.modeling", "BugsLexer"),
        ".ecl": ("pygments.lexers.ecl", "ECLLexer"),
        ".inc": ("pygments.lexers.php", "PhpLexer"),
        ".inf": ("pygments.lexers.configs", "IniLexer"),
        ".pro": ("pygments.lexers.prolog", "PrologLexer"),
        ".sql": ("pygments.lexers.sql", "SqlLexer"),
        ".txt": ("pygments.lexers.special", "TextLexer"),
        ".html": ("pygments.lexers.html", "HtmlLexer"),
    }
    exts = {}
    lexers = {"exts": exts}
    if DEBUG:
        from collections import defaultdict

        duplicates = defaultdict(set)
    for longname, aliases, filenames, mimetypes in get_all_lexers():
        cls = find_lexer_class(longname)
        mod = inspect.getmodule(cls)
        val = (mod.__name__, cls.__name__)
        for filename in filenames:
            if filename.startswith("*."):
                filename = filename[1:]
            if "*" in filename:
                continue
            if (
                DEBUG
                and filename in exts
                and exts[filename] != val
                and filename not in default_exts
            ):
                duplicates[filename].add(val)
                duplicates[filename].add(exts[filename])
            exts[filename] = val
    # remove some ambiquity
    exts.update(default_exts)
    # print duplicate message
    if DEBUG:
        _print_duplicate_message(duplicates)
    return lexers

 def test_lexer(self):
     assert find_lexer_class('ActionScript 3') == Language.find_by_name('ActionScript').lexer
     assert find_lexer_class('ActionScript 3') == Language.find_by_name('ActionScript').lexer
     assert find_lexer_class('Bash') == Language.find_by_name('Gentoo Ebuild').lexer
     assert find_lexer_class('Bash') == Language.find_by_name('Gentoo Eclass').lexer
     assert find_lexer_class('Bash') == Language.find_by_name('Shell').lexer
     assert find_lexer_class('C') == Language.find_by_name('OpenCL').lexer
     assert find_lexer_class('C') == Language.find_by_name('XS').lexer
     assert find_lexer_class('C++') == Language.find_by_name('C++').lexer
     assert find_lexer_class('Coldfusion HTML') == Language.find_by_name('ColdFusion').lexer
     assert find_lexer_class('Coq') == Language.find_by_name('Coq').lexer
     assert find_lexer_class('FSharp') == Language.find_by_name('F#').lexer
     assert find_lexer_class('FSharp') == Language.find_by_name('F#').lexer
     assert find_lexer_class('Fortran') == Language.find_by_name('FORTRAN').lexer
     assert find_lexer_class('Gherkin') == Language.find_by_name('Cucumber').lexer
     assert find_lexer_class('Groovy') == Language.find_by_name('Groovy').lexer
     assert find_lexer_class('HTML') == Language.find_by_name('HTML').lexer
     assert find_lexer_class('HTML+Django/Jinja') == Language.find_by_name('HTML+Django').lexer
     assert find_lexer_class('HTML+PHP') == Language.find_by_name('HTML+PHP').lexer
     assert find_lexer_class('HTTP') == Language.find_by_name('HTTP').lexer
     assert find_lexer_class('JSON') == Language.find_by_name('JSON').lexer
     assert find_lexer_class('Java') == Language.find_by_name('ChucK').lexer
     assert find_lexer_class('Java') == Language.find_by_name('Java').lexer
     assert find_lexer_class('JavaScript') == Language.find_by_name('JavaScript').lexer
     assert find_lexer_class('MOOCode') == Language.find_by_name('Moocode').lexer
     assert find_lexer_class('MuPAD') == Language.find_by_name('mupad').lexer
     assert find_lexer_class('NASM') == Language.find_by_name('Assembly').lexer
     assert find_lexer_class('OCaml') == Language.find_by_name('OCaml').lexer
     assert find_lexer_class('Ooc') == Language.find_by_name('ooc').lexer
     assert find_lexer_class('OpenEdge ABL') == Language.find_by_name('OpenEdge ABL').lexer
     assert find_lexer_class('REBOL') == Language.find_by_name('Rebol').lexer
     assert find_lexer_class('RHTML') == Language.find_by_name('HTML+ERB').lexer
     assert find_lexer_class('RHTML') == Language.find_by_name('RHTML').lexer
     assert find_lexer_class('Ruby') == Language.find_by_name('Mirah').lexer
     assert find_lexer_class('Ruby') == Language.find_by_name('Ruby').lexer
     assert find_lexer_class('S') == Language.find_by_name('R').lexer
     assert find_lexer_class('Scheme') == Language.find_by_name('Emacs Lisp').lexer
     assert find_lexer_class('Scheme') == Language.find_by_name('Nu').lexer
     assert find_lexer_class('Racket') == Language.find_by_name('Racket').lexer
     assert find_lexer_class('Scheme') == Language.find_by_name('Scheme').lexer
     assert find_lexer_class('Standard ML') == Language.find_by_name('Standard ML').lexer
     assert find_lexer_class('TeX') == Language.find_by_name('TeX').lexer
     #FIXME bug by pygments
     # assert find_lexer_class('Verilog') == Language.find_by_name('Verilog').lexer
     assert find_lexer_class('XSLT') == Language.find_by_name('XSLT').lexer
     assert find_lexer_class('aspx-vb') == Language.find_by_name('ASP').lexer
     assert find_lexer_class('haXe') == Language.find_by_name('Haxe').lexer
     assert find_lexer_class('reStructuredText') == Language.find_by_name('reStructuredText').lexer

def tokenize(language, source):
    # have you found yourself looking here after getting a UnicodeDecoeError?
    # thought so. i think upgrading to pygments 1.5 should do the trick.
    lexer = find_lexer_class(language)(encoding="guess")
    return lex(source, lexer)

 def test_lexer(self):
     assert find_lexer_class('ActionScript 3') == Language['ActionScript'].lexer
     assert find_lexer_class('Bash') == Language['Gentoo Ebuild'].lexer
     assert find_lexer_class('Bash') == Language['Gentoo Eclass'].lexer
     assert find_lexer_class('Bash') == Language['Shell'].lexer
     assert find_lexer_class('C') == Language['OpenCL'].lexer
     assert find_lexer_class('C') == Language['XS'].lexer
     assert find_lexer_class('C++') == Language['C++'].lexer
     assert find_lexer_class('Coldfusion HTML') == Language['ColdFusion'].lexer
     assert find_lexer_class('Coq') == Language['Coq'].lexer
     assert find_lexer_class('FSharp') == Language['F#'].lexer
     assert find_lexer_class('FSharp') == Language['F#'].lexer
     assert find_lexer_class('Fortran') == Language['FORTRAN'].lexer
     assert find_lexer_class('Gherkin') == Language['Cucumber'].lexer
     assert find_lexer_class('Groovy') == Language['Groovy'].lexer
     assert find_lexer_class('HTML') == Language['HTML'].lexer
     assert find_lexer_class('HTML+Django/Jinja') == Language['HTML+Django'].lexer
     assert find_lexer_class('HTML+PHP') == Language['HTML+PHP'].lexer
     assert find_lexer_class('HTTP') == Language['HTTP'].lexer
     assert find_lexer_class('JSON') == Language['JSON'].lexer
     assert find_lexer_class('Java') == Language['ChucK'].lexer
     assert find_lexer_class('Java') == Language['Java'].lexer
     assert find_lexer_class('JavaScript') == Language['JavaScript'].lexer
     assert find_lexer_class('MOOCode') == Language['Moocode'].lexer
     assert find_lexer_class('MuPAD') == Language['mupad'].lexer
     assert find_lexer_class('NASM') == Language['Assembly'].lexer
     assert find_lexer_class('OCaml') == Language['OCaml'].lexer
     assert find_lexer_class('Ooc') == Language['ooc'].lexer
     assert find_lexer_class('OpenEdge ABL') == Language['OpenEdge ABL'].lexer
     assert find_lexer_class('REBOL') == Language['Rebol'].lexer
     assert find_lexer_class('RHTML') == Language['HTML+ERB'].lexer
     assert find_lexer_class('RHTML') == Language['RHTML'].lexer
     assert find_lexer_class('Ruby') == Language['Mirah'].lexer
     assert find_lexer_class('Ruby') == Language['Ruby'].lexer
     assert find_lexer_class('S') == Language['R'].lexer
     assert find_lexer_class('Scheme') == Language['Emacs Lisp'].lexer
     assert find_lexer_class('Scheme') == Language['Nu'].lexer
     assert find_lexer_class('Racket') == Language['Racket'].lexer
     assert find_lexer_class('Scheme') == Language['Scheme'].lexer
     assert find_lexer_class('Standard ML') == Language['Standard ML'].lexer
     assert find_lexer_class('TeX') == Language['TeX'].lexer
     assert find_lexer_class('verilog') == Language['Verilog'].lexer
     assert find_lexer_class('XSLT') == Language['XSLT'].lexer
     assert find_lexer_class('aspx-vb') == Language['ASP'].lexer
     assert find_lexer_class('haXe') == Language['Haxe'].lexer
     assert find_lexer_class('reStructuredText') == Language['reStructuredText'].lexer

 def test_lexer(self):
     assert find_lexer_class('Ruby') == self.blob("Ruby/foo.rb").lexer

def get_lexer_by_lang(lang=None):
    cls = pygments_lexers.find_lexer_class(lang or 'Python')
    return lexers.PygmentsLexer(cls)