# Django 3.0.9.dev - dokumentacja

# Kod źródłowy modułu django.utils.safestring

    """
    Functions for working with "safe strings": strings that can be displayed safely
    without further escaping in HTML. Marking something as a "safe string" means
    that the producer of the string has already turned characters that should not
    be interpreted by the HTML engine (e.g. '<') into the appropriate entities.
    """

    from django.utils.functional import wraps

    class SafeData:
        def __html__(self):
            """
            Return the html representation of a string for interoperability.

            This allows other template engines to understand Django's SafeData.
            """
            return self

    class SafeString(str, SafeData):
        """
        A str subclass that has been specifically marked as "safe" for HTML output
        purposes.
        """
        def __add__(self, rhs):
            """
            Concatenating a safe string with another safe bytestring or
            safe string is safe. Otherwise, the result is no longer safe.
            """
            t = super().__add__(rhs)
            if isinstance(rhs, SafeData):
                return SafeString(t)
            return t

        def __str__(self):
            return self

    SafeText = SafeString  # For backwards compatibility since Django 2.0.

    def _safety_decorator(safety_marker, func):
        @wraps(func)
        def wrapped(*args, **kwargs):
            return safety_marker(func(*args, **kwargs))
        return wrapped

    def mark_safe(s):
        """
        Explicitly mark a string as safe for (HTML) output purposes. The returned
        object can be used everywhere a string is appropriate.

        If used on a method as a decorator, mark the returned data as safe.

        Can be called multiple times on a single string.
        """
        if hasattr(s, '__html__'):
            return s
        if callable(s):
            return _safety_decorator(mark_safe, s)
        return SafeString(s)