human
Complete this python program:
def do_translate(parser, token):
assistant
#Here is the Python program you requested.

    """This will mark a string for translation and will
    translate the string for the current language.
    Usage::
    {% trans "this is a test" %}
    This will mark the string for translation so it will
    be pulled out by mark-messages.py into the .po files
    and will run the string through the translation engine.
    There is a second form::
    {% trans "this is a test" noop %}
    This will only mark for translation, but will return
    the string unchanged. Use it when you need to store
    values into forms that should be translated later on.
    You can use variables instead of constant strings
    to translate stuff you marked somewhere else::
    {% trans variable %}
    This will just try to translate the contents of
    the variable ``variable``. Make sure that the string
    in there is something that is in the .po file.
    """
    class TranslateParser(TokenParser, ):
        def top(self):
            value = self.value()
            if (value[0] == "'"):
                pos = None
                m = re.match("^'([^']+)'(\\|.*$)", value)
                if m:
                    value = ('"%s"%s' % (m.group(1).replace('"', '\\"'), m.group(2)))
                elif (value[(-1)] == "'"):
                    value = ('"%s"' % value[1:(-1)].replace('"', '\\"'))
            if self.more():
                if (self.tag() == 'noop'):
                    noop = True
                else:
                    raise TemplateSyntaxError("only    option    for    'trans'    is    'noop'")
            else:
                noop = False
            return (value, noop)
    (value, noop) = TranslateParser(token.contents).top()
    return TranslateNode(parser.compile_filter(value), noop)