fluidattacks-blends-domain 0.6.1

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::assignment::build_assignment_node;
use crate::syntax::fields::java::assignment_expression;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::NodeId;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let variable_id = args.required_field_alt(n_id, assignment_expression::LEFT)?;
    let value_id = args.required_field_alt(n_id, assignment_expression::RIGHT)?;
    let operator_id = args.required_field_alt(n_id, assignment_expression::OPERATOR)?;
    let operation = label_text(args.ast_graph, operator_id)
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?
        .to_owned();
    build_assignment_node(args, n_id, variable_id, Some(value_id), Some(operation)).map(Some)
}