File: scalarbool.py

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# coding: utf-8

from __future__ import print_function, absolute_import, division, unicode_literals

"""
You cannot subclass bool, and this is necessary for round-tripping anchored
bool values (and also if you want to preserve the original way of writing)

bool.__bases__ is type 'int', so that is what is used as the basis for ScalarBoolean as well.

You can use these in an if statement, but not when testing equivalence
"""

from ruamel.yaml.anchor import Anchor

if False:  # MYPY
    from typing import Text, Any, Dict, List  # NOQA

__all__ = ['ScalarBoolean']

# no need for no_limit_int -> int


class ScalarBoolean(int):
    def __new__(cls, *args, **kw):
        # type: (Any, Any, Any) -> Any
        anchor = kw.pop('anchor', None)  # type: ignore
        b = int.__new__(cls, *args, **kw)  # type: ignore
        if anchor is not None:
            b.yaml_set_anchor(anchor, always_dump=True)
        return b

    @property
    def anchor(self):
        # type: () -> Any
        if not hasattr(self, Anchor.attrib):
            setattr(self, Anchor.attrib, Anchor())
        return getattr(self, Anchor.attrib)

    def yaml_anchor(self, any=False):
        # type: (bool) -> Any
        if not hasattr(self, Anchor.attrib):
            return None
        if any or self.anchor.always_dump:
            return self.anchor
        return None

    def yaml_set_anchor(self, value, always_dump=False):
        # type: (Any, bool) -> None
        self.anchor.value = value
        self.anchor.always_dump = always_dump