How to use the docassemble.base.mako.compat function in docassemble

def _compile_module_file(template, text, filename, outputpath, module_writer):
    source, lexer = _compile(template, text, filename,
                             generate_magic_comment=True)

    if isinstance(source, compat.text_type):
        source = source.encode(lexer.encoding or 'ascii')

    if module_writer:
        module_writer(source, outputpath)
    else:
        # make tempfiles in the same location as the ultimate
        # location.   this ensures they're on the same filesystem,
        # avoiding synchronization issues.
        (dest, name) = tempfile.mkstemp(dir=os.path.dirname(outputpath))

        os.write(dest, source)
        os.close(dest)
        shutil.move(name, outputpath)

def get_module_source_metadata(cls, module_source, full_line_map=False):
        source_map = re.search(
            r"__M_BEGIN_METADATA(.+?)__M_END_METADATA",
            module_source, re.S).group(1)
        source_map = compat.json.loads(source_map)
        source_map['line_map'] = dict(
            (int(k), int(v))
            for k, v in source_map['line_map'].items())
        if full_line_map:
            f_line_map = source_map['full_line_map'] = []
            line_map = source_map['line_map']

            curr_templ_line = 1
            for mod_line in range(1, max(line_map)):
                if mod_line in line_map:
                    curr_templ_line = line_map[mod_line]
                f_line_map.append(curr_templ_line)
        return source_map

def verify_directory(dir):
    """create and/or verify a filesystem directory."""

    tries = 0

    while not os.path.exists(dir):
        try:
            tries += 1
            os.makedirs(dir, compat.octal("0775"))
        except:
            if tries > 5:
                raise

def __init__(self, key, value):
            self.key = key
            self.value = value
            self.timestamp = compat.time_func()

rawrecords = traceback.extract_tb(trcback)
        new_trcback = []
        for filename, lineno, function, line in rawrecords:
            if not line:
                line = ''
            try:
                (line_map, template_lines) = mods[filename]
            except KeyError:
                try:
                    info = docassemble.base.mako.template._get_module_info(filename)
                    module_source = info.code
                    template_source = info.source
                    template_filename = info.template_filename or filename
                except KeyError:
                    # A normal .py file (not a Template)
                    if not compat.py3k:
                        try:
                            fp = open(filename, 'rb')
                            encoding = util.parse_encoding(fp)
                            fp.close()
                        except IOError:
                            encoding = None
                        if encoding:
                            line = line.decode(encoding)
                        else:
                            line = line.decode('ascii', 'replace')
                    new_trcback.append((filename, lineno, function, line,
                                        None, None, None, None))
                    continue

                template_ln = 1

def parse(code, mode='exec', **exception_kwargs):
    """Parse an expression into AST"""

    try:
        return _ast_util.parse(code, '', mode)
    except Exception:
        raise exceptions.SyntaxException(
            "(%s) %s (%r)" % (
                compat.exception_as().__class__.__name__,
                compat.exception_as(),
                code[0:50]
            ), **exception_kwargs)

# Copyright (C) 2006-2015 the Mako authors and contributors 
#
# This module is part of Mako and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""Handles parsing of Python code.

Parsing to AST is done via _ast on Python > 2.5, otherwise the compiler
module is used.
"""

from docassemble.base.mako import exceptions, util, compat
from docassemble.base.mako.compat import arg_stringname
import operator

if compat.py3k:
    # words that cannot be assigned to (notably
    # smaller than the total keys in __builtins__)
    reserved = set(['True', 'False', 'None', 'print'])

    # the "id" attribute on a function node
    arg_id = operator.attrgetter('arg')
else:
    # words that cannot be assigned to (notably
    # smaller than the total keys in __builtins__)
    reserved = set(['True', 'False', 'None'])

    # the "id" attribute on a function node
    arg_id = operator.attrgetter('id')

import _ast
util.restore__ast(_ast)

def decode(x):
            if isinstance(x, compat.text_type):
                return x
            elif not isinstance(x, compat.binary_type):
                return decode(str(x))
            else:
                return compat.text_type(x, encoding=key)
        return decode

def __init__(self, buffer, **data):
        self._buffer_stack = [buffer]

        self._data = data

        self._kwargs = data.copy()
        self._with_template = None
        self._outputting_as_unicode = None
        self.namespaces = {}

        # "capture" function which proxies to the
        # generic "capture" function
        self._data['capture'] = compat.partial(capture, self)

        # "caller" stack used by def calls with content
        self.caller_stack = self._data['caller'] = CallerStack()

def write_metadata_struct(self):
        self.printer.source_map[self.printer.lineno] = \
            max(self.printer.source_map)
        struct = {
            "filename": self.compiler.filename,
            "uri": self.compiler.uri,
            "source_encoding": self.compiler.source_encoding,
            "line_map": self.printer.source_map,
        }
        self.printer.writelines(
            '"""',
            '__M_BEGIN_METADATA',
            compat.json.dumps(struct),
            '__M_END_METADATA\n'
            '"""'