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

def _make_attribute_value_state(terminator, host_triple, host_double,
                                    _escape=_escape):
        token = (String.Double if terminator == r'"' else
                 String.Single if terminator == r"'" else String.Other)
        host_char = r'"' if host_double else r"'"
        host_quantifier = r'{3,}' if host_triple else r''
        host_token = String.Double if host_double else String.Single
        escaped_quotes = (r'+|%s(?!%s{2})' % (host_char, host_char)
                          if host_triple else r'')
        return [
            (r'%s%s' % (host_char, host_quantifier), host_token, '#pop:3'),
            (r'%s%s' % (r'' if token is String.Other else r'\\?', terminator),
             token, '#pop'),
            include('s/verbatim'),
            include('s/entity'),
            (r'\{([^}<\\%s]|<(?!<)|\\%s%s|%s|\\.)*\}' %
             (host_char, host_char, escaped_quotes, _escape), String.Interpol),
            (r'([^\s"\'<%s{}\\&])+' % (r'>' if token is String.Other else r''),
             token),
            include('s/escape'),
            (r'["\'\s&{<}\\]', token)
        ]

'multistring': [
            (r'[^"}]', String),
            (r'"\}', String, '#pop'),
            (r'["}]', String),
        ],
        'whitespace': [
            (r'L?"', String, 'string'),
            (r'\{"', String, 'multistring'),
            (r'\n', Text),
            (r'\s+', Text),
            (r'\\\n', Text),  # line continuation
        ],
        'root': [
            include('whitespace'),
            include('comments'),
            include('statements'),
            (r'\s+', Text),
        ],
    }


class VCLSnippetLexer(VCLLexer):
    """
    For Varnish Configuration Language snippets.

    .. versionadded:: 2.2
    """
    name = 'VCLSnippets'
    aliases = ['vclsnippets', 'vclsnippet']
    mimetypes = ['text/x-vclsnippet']
    filenames = []

('', Text, 'statement'),
        ],
        'classname': [
            (r'[a-zA-Z_][a-zA-Z0-9_]*', Name.Class, '#pop'),
            # template specification
            (r'\s*(?=>)', Text, '#pop'),
        ],
        'statement' : [
            include('whitespace'),
            include('statements'),
            ('[{}]', Punctuation),
            (';', Punctuation, '#pop'),
        ],
        'function': [
            include('whitespace'),
            include('statements'),
            (';', Punctuation),
            ('{', Punctuation, '#push'),
            ('}', Punctuation, '#pop'),
        ],
        'string': [
            (r'"', String, '#pop'),
            (r'\\([\\abfnrtv"\']|x[a-fA-F0-9]{2,4}|[0-7]{1,3})', String.Escape),
            (r'[^\\"\n]+', String), # all other characters
            (r'\\\n', String), # line continuation
            (r'\\', String), # stray backslash
        ],
        'macro': [
            (r'[^/\n]+', Comment.Preproc),
            (r'/[*](.|\n)*?[*]/', Comment.Multiline),
            (r'//.*?\n', Comment.Single, '#pop'),
            (r'/', Comment.Preproc),

(r'\)', Punctuation),
            (r'(%s)(do%s)' % (_space, _token_terminator),
             bygroups(using(this, state='text'), Keyword), '#pop'),
            (r'[%s]+' % _nl, Text),
            include('follow')
        ],
        'for/f': [
            (r'(")((?:%s|[^"])*?")([%s%s]*)(\))' % (_variable, _nl, _ws),
             bygroups(String.Double, using(this, state='string'), Text,
                      Punctuation)),
            (r'"', String.Double, ('#pop', 'for2', 'string')),
            (r"('(?:%s|[\w\W])*?')([%s%s]*)(\))" % (_variable, _nl, _ws),
             bygroups(using(this, state='sqstring'), Text, Punctuation)),
            (r'(`(?:%s|[\w\W])*?`)([%s%s]*)(\))' % (_variable, _nl, _ws),
             bygroups(using(this, state='bqstring'), Text, Punctuation)),
            include('for2')
        ],
        'for/l': [
            (r'-?\d+', Number.Integer),
            include('for2')
        ],
        'if': [
            (r'((?:cmdextversion|errorlevel)%s)(%s)(\d+)' %
             (_token_terminator, _space),
             bygroups(Keyword, using(this, state='text'),
                      Number.Integer), '#pop'),
            (r'(defined%s)(%s)(%s)' % (_token_terminator, _space, _stoken),
             bygroups(Keyword, using(this, state='text'),
                      using(this, state='variable')), '#pop'),
            (r'(exist%s)(%s%s)' % (_token_terminator, _space, _stoken),
             bygroups(Keyword, using(this, state='text')), '#pop'),
            (r'(%s%s?)(==)(%s?%s)' % (_stoken, _space, _space, _stoken),

],
        'data': [
            (r'(?s)\$?"(\\\\|\\[0-7]+|\\.|[^"\\$])*"', String.Double),
            (r'"', String.Double, 'string'),
            (r"(?s)\$'(\\\\|\\[0-7]+|\\.|[^'\\])*'", String.Single),
            (r"(?s)'.*?'", String.Single),
            (r';', Punctuation),
            (r'&|\||\^|<|>', Operator),
            (r'\s+', Text),
            (r'\d+(?= |\Z)', Number),
            (r'[^=\s\[\]{}()$"\'`\\<&|;]+', Text),
        ],
        'string': [
            (r'"', String.Double, '#pop'),
            (r'(?s)(\\\\|\\[0-7]+|\\.|[^"\\$])+', String.Double),
            include('interp'),
        ],
        'paren': [
            (r'\)', Keyword, '#pop'),
            include('root'),
        ],
        'math': [
            (r'\)\)', Keyword, '#pop'),
            (r'[-+*/%^|&]|\*\*|\|\|', Operator),
            (r'\d+#\d+', Number),
            (r'\d+#(?! )', Number),
            (r'\d+', Number),
            include('root'),
        ],

# params with colons or equals
            (r'([^\s=:]+)(\s*)(=|:)',
             bygroups(Name.Attribute, Whitespace, Operator)),
            # explicit variables
            (r'(\{\{)(\s*)([^\s}])(\s*)(\}\})',
             bygroups(Punctuation, Whitespace, using(this, state = 'variable'),
                      Whitespace, Punctuation)),

            include('string'),
            include('number'),
            include('keyword'),
            (r',', Punctuation)
        ],

        'default-param-markup': [
            include('param-markup'),
            (r'.', Text)  # fallback for switches / variables / un-quoted strings / ...
        ],

        'variable-param-markup': [
            include('param-markup'),
            include('variable'),
            (r'.', Text)  # fallback
        ],

        'tag-markup': [
            (r'%\}', Punctuation, ('#pop', '#pop')),  # end of tag
            include('default-param-markup')
        ],

        'variable-tag-markup': [
            (r'%\}', Punctuation, ('#pop', '#pop')),  # end of tag

],

        # ignored and regular whitespaces in quoted scalars
        'quoted-scalar-whitespaces': [
            # leading and trailing whitespaces are ignored
            (r'^[ ]+|[ ]+$', Text),
            # line breaks are ignored
            (r'\n+', Text),
            # other whitespaces are a part of the value
            (r'[ ]+', Name.Variable),
        ],

        # single-quoted scalars
        'single-quoted-scalar': [
            # include whitespace and line break rules
            include('quoted-scalar-whitespaces'),
            # escaping of the quote character
            (r'\'\'', String.Escape),
            # regular non-whitespace characters
            (r'[^ \t\n\r\f\v\']+', String),
            # the closing quote
            (r'\'', String, '#pop'),
        ],

        # double-quoted scalars
        'double-quoted-scalar': [
            # include whitespace and line break rules
            include('quoted-scalar-whitespaces'),
            # escaping of special characters
            (r'\\[0abt\tn\nvfre "\\N_LP]', String),
            # escape codes
            (r'\\(?:x[0-9A-Fa-f]{2}|u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})',

(r'(\$[A-Z_a-z]\w*\.?)(\()', bygroups(Comment.Preproc, Punctuation),
             'macro parameter value list'),
            (r'\$[A-Z_a-z]\w*(?:\.|\b)', Comment.Preproc)
        ],
        'macro parameter value list': [
            (r'(?:[^\'#"{()]|\{(?!\{))+', Comment.Preproc),
            (r"['#]", Punctuation),
            (r'"', String, 'macro parameter value quoted string'),
            (r'\{\{', String, 'macro parameter value braced string'),
            (r'\(', Comment.Preproc, 'macro parameter value parenthetical'),
            (r'\)', Punctuation, '#pop')
        ],
        'macro parameter value quoted string': [
            (r"\\[#'()]", Comment.Preproc),
            (r"[#'()]", Error),
            include('quoted string')
        ],
        'macro parameter value braced string': [
            (r"\\[#'()]", Comment.Preproc),
            (r"[#'()]", Error),
            include('braced string')
        ],
        'macro parameter value parenthetical': [
            (r'(?:[^\\()]|\\\))+', Comment.Preproc),
            (r'\(', Comment.Preproc, '#push'),
            (r'\)', Comment.Preproc, '#pop')
        ],

        'whitespace and macro uses': [
            include('whitespace'),
            include('macro uses')
        ],

(r'`', Operator),
            (r'[{}()\[\];,]', Punctuation),

            # literals. No check for literal characters with len > 1
            (r'[0-9]+\.[0-9]+([eE][\-+]?[0-9]+)?', Number.Float),
            (r'0[xX][0-9a-fA-F]+', Number.Hex),
            (r'[0-9]+', Number.Integer),

            (r"'", String.Char, 'char'),
            (r'"', String.Double, 'string'),
        ],

        # type started by alias
        'alias-type': [
            (r'=', Keyword),
            include('type')
        ],

        # type started by struct
        'struct-type': [
            (r'(?=\((?!,*\)))', Punctuation, '#pop'),
            include('type')
        ],

        # type started by colon
        'type': [
            (r'[(\[<]', tokenType, 'type-nested'),
            include('type-content')
        ],

        # type nested in brackets: can contain parameters, comma etc.
        'type-nested': [