fluidattacks-blends-domain 0.40.0

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use alloc::borrow::ToOwned;

use crate::query::label_text;
use crate::syntax::builders::unary_expression::build_unary_expression_node;
use crate::syntax::fields::go::unary_expression;
use crate::syntax::fields::Field;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::NodeId;

const OPTIONAL_OPERATOR: Field<false> = Field::new("operator_id");

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let operator = args
        .optional_field_alt(n_id, OPTIONAL_OPERATOR)
        .and_then(|id| label_text(graph, id))
        .map(ToOwned::to_owned)
        .unwrap_or_default();
    let operand_id = args.required_field_alt(n_id, unary_expression::OPERAND)?;
    build_unary_expression_node(args, n_id, operator, operand_id).map(Some)
}