How to use the pygments.lexer.using function in Pygments

filenames = ['Dockerfile', '*.docker']
    mimetypes = ['text/x-dockerfile-config']

    _keywords = (r'(?:FROM|MAINTAINER|CMD|EXPOSE|ENV|ADD|ENTRYPOINT|'
                 r'VOLUME|WORKDIR)')

    flags = re.IGNORECASE | re.MULTILINE

    tokens = {
        'root': [
            (r'^(ONBUILD)(\s+)(%s)\b' % (_keywords,),
             bygroups(Name.Keyword, Whitespace, Keyword)),
            (r'^(%s)\b(.*)' % (_keywords,), bygroups(Keyword, String)),
            (r'#.*', Comment),
            (r'RUN', Keyword),  # Rest of line falls through
            (r'(.*\\\n)*.+', using(BashLexer)),
        ],
    }


class TerraformLexer(RegexLexer):
    """
    Lexer for `terraformi .tf files `_.

    .. versionadded:: 2.1
    """

    name = 'Terraform'
    aliases = ['terraform', 'tf']
    filenames = ['*.tf']
    mimetypes = ['application/x-tf', 'application/x-terraform']

'root': [
            include('whitespace'),
            # functions
            (r'((?:[\w*\s])+?(?:\s|[*]))'  # return arguments
             r'([a-zA-Z_]\w*)'             # method name
             r'(\s*\([^;]*?\))'            # signature
             r'([^;{]*)(\{)',
             bygroups(using(this), Name.Function, using(this), using(this),
                      Punctuation),
             'function'),
            # function declarations
            (r'((?:[\w*\s])+?(?:\s|[*]))'  # return arguments
             r'([a-zA-Z_]\w*)'             # method name
             r'(\s*\([^;]*?\))'            # signature
             r'([^;]*)(;)',
             bygroups(using(this), Name.Function, using(this), using(this),
                      Punctuation)),
            default('statement'),
        ],
        'statement': [
            include('whitespace'),
            include('statements'),
            ('[{}]', Punctuation),
            (';', Punctuation, '#pop'),
        ],
        'function': [
            include('whitespace'),
            include('statements'),
            (';', Punctuation),
            (r'\{', Punctuation, '#push'),
            (r'\}', Punctuation, '#pop'),
        ],

(r'<\s*/\s*[a-zA-Z0-9:]+\s*>', Name.Tag),
        ],
        'comment': [
            ('[^-]+', Comment),
            ('-->', Comment, '#pop'),
            ('-', Comment),
        ],
        'tag': [
            (r'\s+', Text),
            (r'[a-zA-Z0-9_:-]+\s*=', Name.Attribute, 'attr'),
            (r'[a-zA-Z0-9_:-]+', Name.Attribute),
            (r'/?\s*>', Name.Tag, '#pop'),
        ],
        'script-content': [
            (r'<\s*/\s*script\s*>', Name.Tag, '#pop'),
            (r'.+?(?=<\s*/\s*script\s*>)', using(JavascriptLexer)),
        ],
        'style-content': [
            (r'<\s*/\s*style\s*>', Name.Tag, '#pop'),
            (r'.+?(?=<\s*/\s*style\s*>)', using(CssLexer)),
        ],
        'attr': [
            ('".*?"', String, '#pop'),
            ("'.*?'", String, '#pop'),
            (r'[^\s>]+', String, '#pop'),
        ],
    }

    def analyse_text(text):
        if html_doctype_matches(text):
            return 0.5

name = 'Mason'
    aliases = ['mason']
    filenames = ['*.m', '*.mhtml', '*.mc', '*.mi', 'autohandler', 'dhandler']
    mimetypes = ['application/x-mason']

    tokens = {
        'root': [
            (r'\s+', Text),
            (r'(?s)(<%doc>)(.*?)()',
             bygroups(Name.Tag, Comment.Multiline, Name.Tag)),
            (r'(?s)(<%(?:def|method))(\s*)(.*?)(>)(.*?)()',
             bygroups(Name.Tag, Text, Name.Function, Name.Tag,
                      using(this), Name.Tag)),
            (r'(?s)(<%\w+)(.*?)(>)(.*?)()',
             bygroups(Name.Tag, Name.Function, Name.Tag,
                      using(PerlLexer), Name.Tag)),
            (r'(?s)(<&[^|])(.*?)(,.*?)?(&>)',
             bygroups(Name.Tag, Name.Function, using(PerlLexer), Name.Tag)),
            (r'(?s)(<&\|)(.*?)(,.*?)?(&>)',
             bygroups(Name.Tag, Name.Function, using(PerlLexer), Name.Tag)),
            (r'', Name.Tag),
            (r'(?s)(<%!?)(.*?)(%>)',
             bygroups(Name.Tag, using(PerlLexer), Name.Tag)),
            (r'(?<=^)#[^\n]*(\n|\Z)', Comment),
            (r'(?<=^)(%)([^\n]*)(\n|\Z)',
             bygroups(Name.Tag, using(PerlLexer), Other)),
            (r"""(?sx)
                 (.+?)               # anything, followed by:
                 (?:
                  (?<=\n)(?=[%#]) |  # an eval or comment line
                  (?=

rest = '(?:%s|%s|[^"%%%s%s%s])*' % (_string, _variable, _nl, _punct,
                                            ')' if compound else '')
        rest_of_line = r'(?:(?:[^%s^]|\^[%s]?[\w\W])*)' % (_nl, _nl)
        rest_of_line_compound = r'(?:(?:[^%s^)]|\^[%s]?[^)])*)' % (_nl, _nl)
        set_space = r'((?:(?:\^[%s]?)?[^\S\n])*)' % _nl
        suffix = ''
        if compound:
            _keyword_terminator = r'(?:(?=\))|%s)' % _keyword_terminator
            _token_terminator = r'(?:(?=\))|%s)' % _token_terminator
            suffix = '/compound'
        return [
            ((r'\)', Punctuation, '#pop') if compound else
             (r'\)((?=\()|%s)%s' % (_token_terminator, rest_of_line),
              Comment.Single)),
            (r'(?=%s)' % _start_label, Text, 'follow%s' % suffix),
            (_space, using(this, state='text')),
            include('redirect%s' % suffix),
            (r'[%s]+' % _nl, Text),
            (r'\(', Punctuation, 'root/compound'),
            (r'@+', Punctuation),
            (r'((?:for|if|rem)(?:(?=(?:\^[%s]?)?/)|(?:(?!\^)|'
             r'(?<=m))(?:(?=\()|%s)))(%s?%s?(?:\^[%s]?)?/(?:\^[%s]?)?\?)' %
             (_nl, _token_terminator, _space,
              _core_token_compound if compound else _core_token, _nl, _nl),
             bygroups(Keyword, using(this, state='text')),
             'follow%s' % suffix),
            (r'(goto%s)(%s(?:\^[%s]?)?/(?:\^[%s]?)?\?%s)' %
             (_keyword_terminator, rest, _nl, _nl, rest),
             bygroups(Keyword, using(this, state='text')),
             'follow%s' % suffix),
            (words(('assoc', 'break', 'cd', 'chdir', 'cls', 'color', 'copy',
                    'date', 'del', 'dir', 'dpath', 'echo', 'endlocal', 'erase',

bygroups(Keyword, using(this, state='text'), Keyword,
                      using(this, state='text'), Keyword,
                      using(this, state='text')), ('(?', 'if')),
            (r'rem(((?=\()|%s)%s?%s?.*|%s%s)' %
             (_token_terminator, _space, _stoken, _keyword_terminator,
              rest_of_line_compound if compound else rest_of_line),
             Comment.Single, 'follow%s' % suffix),
            (r'(set%s)%s(/a)' % (_keyword_terminator, set_space),
             bygroups(Keyword, using(this, state='text'), Keyword),
             'arithmetic%s' % suffix),
            (r'(set%s)%s((?:/p)?)%s((?:(?:(?:\^[%s]?)?[^"%s%s^=%s]|'
             r'\^[%s]?[^"=])+)?)((?:(?:\^[%s]?)?=)?)' %
             (_keyword_terminator, set_space, set_space, _nl, _nl, _punct,
              ')' if compound else '', _nl, _nl),
             bygroups(Keyword, using(this, state='text'), Keyword,
                      using(this, state='text'), using(this, state='variable'),
                      Punctuation),
             'follow%s' % suffix),
            default('follow%s' % suffix)
        ]

'functionname': [
            include('magicfuncs'),
            (_ident_inner, Name.Function, '#pop'),
            default('#pop')
        ],
        'string': [
            (r'"', String.Double, '#pop'),
            (r'[^{$"\\]+', String.Double),
            (r'\\([nrt"$\\]|[0-7]{1,3}|x[0-9a-f]{1,2})', String.Escape),
            (r'\$' + _ident_inner + '(\[\S+?\]|->' + _ident_inner + ')?',
             String.Interpol),
            (r'(\{\$\{)(.*?)(\}\})',
             bygroups(String.Interpol, using(this, _startinline=True),
                      String.Interpol)),
            (r'(\{)(\$.*?)(\})',
             bygroups(String.Interpol, using(this, _startinline=True),
                      String.Interpol)),
            (r'(\$\{)(\S+)(\})',
             bygroups(String.Interpol, Name.Variable, String.Interpol)),
            (r'[${\\]', String.Double)
        ],
    }

    def __init__(self, **options):
        self.funcnamehighlighting = get_bool_opt(
            options, 'funcnamehighlighting', True)
        self.disabledmodules = get_list_opt(
            options, 'disabledmodules', ['unknown'])
        self.startinline = get_bool_opt(options, 'startinline', False)

        # private option argument for the lexer itself
        if '_startinline' in options:

include('whitespace'),
            (r'(function|record)\b', Keyword.Reserved),
            (r'(if|for|when|while)\b', Keyword.Reserved, '#pop'),
            (_name, Name.Class, '#pop'),
            default('#pop')
        ],
        'package-prefix': [
            include('whitespace'),
            (_name, Name.Namespace, '#pop'),
            default('#pop')
        ],
        'string': [
            (r'"', String.Double, '#pop'),
            (r'\\[\'"?\\abfnrtv]', String.Escape),
            (r'(?i)<\s*html\s*>([^\\"]|\\.)+?(<\s*/\s*html\s*>|(?="))',
             using(HtmlLexer)),
            (r'<|\\?[^"\\<]+', String.Double)
        ]
    }


class BugsLexer(RegexLexer):
    """
    Pygments Lexer for `OpenBugs `_ and WinBugs
    models.

    .. versionadded:: 1.6
    """

    name = 'BUGS'
    aliases = ['bugs', 'winbugs', 'openbugs']
    filenames = ['*.bug']

tokens = {
        'root': [
            (r'\s+', Text),
            (r'(<%doc>)(.*?)()(?s)',
             bygroups(Name.Tag, Comment.Multiline, Name.Tag)),
            (r'(<%(?:def|method))(\s*)(.*?)(>)(.*?)()(?s)',
             bygroups(Name.Tag, Text, Name.Function, Name.Tag,
                      using(this), Name.Tag)),
            (r'(<%\w+)(.*?)(>)(.*?)()(?s)',
             bygroups(Name.Tag, Name.Function, Name.Tag,
                      using(PerlLexer), Name.Tag)),
            (r'(<&[^|])(.*?)(,.*?)?(&>)(?s)',
             bygroups(Name.Tag, Name.Function, using(PerlLexer), Name.Tag)),
            (r'(<&\|)(.*?)(,.*?)?(&>)(?s)',
             bygroups(Name.Tag, Name.Function, using(PerlLexer), Name.Tag)),
            (r'', Name.Tag),
            (r'(<%!?)(.*?)(%>)(?s)',
             bygroups(Name.Tag, using(PerlLexer), Name.Tag)),
            (r'(?<=^)#[^\n]*(\n|\Z)', Comment),
            (r'(?<=^)(%)([^\n]*)(\n|\Z)',
             bygroups(Name.Tag, using(PerlLexer), Other)),
            (r"""(?sx)
                 (.+?)               # anything, followed by:
                 (?:
                  (?<=\n)(?=[%#]) |  # an eval or comment line
                  (?=

bygroups(Punctuation, using(ScalaLexer)),  'root'),
            default('plain'),
        ],

        'content': [
            include('css'),
            (r'!!!' + _dot + r'*\n', Name.Namespace, '#pop'),
            (r'(/)(\[' + _dot + r'*?\])(' + _dot + r'*\n)',
             bygroups(Comment, Comment.Special, Comment),
             '#pop'),
            (r'/' + _dot + r'*\n', _starts_block(Comment, 'html-comment-block'),
             '#pop'),
            (r'-#' + _dot + r'*\n', _starts_block(Comment.Preproc,
                                                  'scaml-comment-block'), '#pop'),
            (r'(-@\s*)(import)?(' + _dot + r'*\n)',
             bygroups(Punctuation, Keyword, using(ScalaLexer)),
             '#pop'),
            (r'(-)(' + _dot + r'*\n)',
             bygroups(Punctuation, using(ScalaLexer)),
             '#pop'),
            (r':' + _dot + r'*\n', _starts_block(Name.Decorator, 'filter-block'),
             '#pop'),
            (r'[\w:-]+', Name.Tag, 'tag'),
            (r'\|', Text, 'eval-or-plain'),
        ],

        'tag': [
            include('css'),
            (r'\{(,\n|' + _dot + r')*?\}', using(ScalaLexer)),
            (r'\[' + _dot + r'*?\]', using(ScalaLexer)),
            (r'\(', Text, 'html-attributes'),
            (r'/[ \t]*\n', Punctuation, '#pop:2'),