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1df46b5a06
Change the parsing for values to make them more reusable, in particular for when I implement extensions.
55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
# binding.py
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#
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# Copyright 2023 James Westman <james@jwestman.net>
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 3 of the
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# License, or (at your option) any later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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from dataclasses import dataclass
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from .common import *
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from .expression import ExprChain, LookupOp, IdentExpr
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from .contexts import ValueTypeCtx
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class Binding(AstNode):
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grammar = [
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Keyword("bind"),
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ExprChain,
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]
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@property
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def expression(self) -> ExprChain:
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return self.children[ExprChain][0]
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@property
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def simple_binding(self) -> T.Optional["SimpleBinding"]:
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if isinstance(self.expression.last, LookupOp):
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if isinstance(self.expression.last.lhs, IdentExpr):
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return SimpleBinding(
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self.expression.last.lhs.ident, self.expression.last.property_name
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)
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return None
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@validate("bind")
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def not_bindable(self) -> None:
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if binding_error := self.context[ValueTypeCtx].binding_error:
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raise binding_error
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@dataclass
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class SimpleBinding:
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source: str
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property_name: str
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