Class _anonymous_label

lib/sqlalchemy/sql/elements.py:5968–6036

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_with_key(
        cls, seed: int | str, body: str, sanitize_key: bool = False
    ) -> typing_Tuple[_anonymous_label, str]:
        # need to escape chars that interfere with format
        # strings in any case, issue #8724
        body = _anonymous_label_escape.sub("_", body)

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

        key = f"{seed} {body.replace('%', '%%')}"
        label = _anonymous_label(f"%({key})s")
        return label, key

    @classmethod
    def safe_construct(
        cls, seed: int | str, body: str, sanitize_key: bool = False
    ) -> _anonymous_label:
        # need to escape chars that interfere with format
        # strings in any case, issue #8724
        body = _anonymous_label_escape.sub("_", body)

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

        return _anonymous_label(f"%({seed} {body.replace('%', '%%')})s")

    def __add__(self, other: str) -> _anonymous_label:
        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: str) -> _anonymous_label:
        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),