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"""Rendering formatter parameter handling."""
import typing
from . import base
__all__ = ['FORMATTERS', 'verify_formatter', 'Formatter']
FORMATTERS = {'cairo',
'core',
'gd',
'gdiplus',
'gdwbmp',
'xlib'}
REQUIRED = False
def verify_formatter(formatter: typing.Optional[str], *,
required: bool = REQUIRED) -> None:
if formatter is None:
if required:
raise ValueError('missing formatter')
elif formatter.lower() not in FORMATTERS:
raise ValueError(f'unknown formatter: {formatter!r}'
f' (must be None or one of {sorted(FORMATTERS)})')
class Formatter(base.ParameterBase):
"""Rendering engine parameter (no default)."""
_formatter = None
_verify_formatter = staticmethod(verify_formatter)
def __init__(self, *, formatter: typing.Optional[str] = None, **kwargs) -> None:
super().__init__(**kwargs)
self.formatter = formatter
def _copy_kwargs(self, **kwargs):
"""Return the kwargs to create a copy of the instance."""
formatter = self._getattr_from_dict('_formatter')
if formatter is not None:
kwargs['formatter'] = formatter
return super()._copy_kwargs(**kwargs)
@property
def formatter(self) -> typing.Optional[str]:
"""The output formatter used for rendering
(``'cairo'``, ``'gd'``, ...)."""
return self._formatter
@formatter.setter
def formatter(self, formatter: typing.Optional[str]) -> None:
if formatter is None:
self.__dict__.pop('_formatter', None)
else:
formatter = formatter.lower()
self._verify_formatter(formatter)
self._formatter = formatter
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