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"""
pint.delegates.txt_defparser.defaults
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Definitions for parsing Default sections.
See each one for a slighly longer description of the
syntax.
:copyright: 2022 by Pint Authors, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import annotations
import typing as ty
from dataclasses import dataclass, fields
from ..._vendor import flexparser as fp
from ...facets.plain import definitions
from . import block, plain
@dataclass(frozen=True)
class BeginDefaults(fp.ParsedStatement):
"""Being of a defaults directive.
@defaults
"""
@classmethod
def from_string(cls, s: str) -> fp.FromString[BeginDefaults]:
if s.strip() == "@defaults":
return cls()
return None
@dataclass(frozen=True)
class DefaultsDefinition(block.DirectiveBlock):
"""Directive to store values.
@defaults
system = mks
@end
See Equality and Comment for more parsing related information.
"""
opening: fp.Single[BeginDefaults]
body: fp.Multi[
ty.Union[
plain.CommentDefinition,
plain.Equality,
]
]
@property
def _valid_fields(self):
return tuple(f.name for f in fields(definitions.DefaultsDefinition))
def derive_definition(self):
for definition in self.filter_by(plain.Equality):
if definition.lhs not in self._valid_fields:
raise ValueError(
f"`{definition.lhs}` is not a valid key "
f"for the default section. {self._valid_fields}"
)
return definitions.DefaultsDefinition(
*tuple(self.get_key(key) for key in self._valid_fields)
)
def get_key(self, key):
for stmt in self.body:
if isinstance(stmt, plain.Equality) and stmt.lhs == key:
return stmt.rhs
raise KeyError(key)
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