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"""
pint.facets.group.definitions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:copyright: 2022 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import annotations
from collections.abc import Iterable
from dataclasses import dataclass
from ..._typing import Self
from ... import errors
from .. import plain
@dataclass(frozen=True)
class GroupDefinition(errors.WithDefErr):
"""Definition of a group."""
#: name of the group
name: str
#: unit groups that will be included within the group
using_group_names: tuple[str]
#: definitions for the units existing within the group
definitions: tuple[plain.UnitDefinition]
@classmethod
def from_lines(
cls: type[Self], lines: Iterable[str], non_int_type: type
) -> Self | None:
# TODO: this is to keep it backwards compatible
from ...delegates import ParserConfig, txt_defparser
cfg = ParserConfig(non_int_type)
parser = txt_defparser.DefParser(cfg, None)
pp = parser.parse_string("\n".join(lines) + "\n@end")
for definition in parser.iter_parsed_project(pp):
if isinstance(definition, cls):
return definition
@property
def unit_names(self) -> tuple[str]:
return tuple(el.name for el in self.definitions)
def __post_init__(self) -> None:
if not errors.is_valid_group_name(self.name):
raise self.def_err(errors.MSG_INVALID_GROUP_NAME)
for k in self.using_group_names:
if not errors.is_valid_group_name(k):
raise self.def_err(
f"refers to '{k}' that " + errors.MSG_INVALID_GROUP_NAME
)
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