Class _anonymous_label

lib/sqlalchemy/sql/elements.py:5532–5592

A unicode subclass used to identify anonymously generated names.

class _anonymous_label(_truncated_label):
    """A unicode subclass used to identify anonymously
    generated names."""

    __slots__ = ()

    @classmethod
    def safe_construct(
        cls,
        seed: int,
        body: str,
        enclosing_label: Optional[str] = None,
        sanitize_key: bool = False,
    ) -> _anonymous_label:
        # need to escape chars that interfere with format
        # strings in any case, issue #8724
        body = re.sub(r"[%\(\) \$]+", "_", body)

        if sanitize_key:
            # sanitize_key is then an extra step used by BindParameter
            body = body.strip("_")

        label = "%%(%d %s)s" % (seed, body.replace("%", "%%"))
        if enclosing_label:
            label = "%s%s" % (enclosing_label, label)

        return _anonymous_label(label)

    def __add__(self, other):
        if "%" in other and not isinstance(other, _anonymous_label):
            other = str(other).replace("%", "%%")
        else:
            other = str(other)

        return _anonymous_label(
            quoted_name(
                str.__add__(self, other),
                self.quote,
            )
        )

    def __radd__(self, other):
        if "%" in other and not isinstance(other, _anonymous_label):
            other = str(other).replace("%", "%%")
        else:
            other = str(other)

        return _anonymous_label(
            quoted_name(
                str.__add__(other, self),
                self.quote,
            )
        )

    def apply_map(self, map_):
        if self.quote is not None:
            # preserve quoting only if necessary
            return quoted_name(self % map_, self.quote)