fluidattacks-blends-domain 0.17.1

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use crate::{
    query::{adj_ast, pred_ast},
    syntax::{builders::pair::build_pair_node, SyntaxGraphArgs, SyntaxGraphError},
    NodeId,
};
use alloc::vec::Vec;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let p_id = pred_ast(graph, n_id, Some(1))
        .first()
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let c_ids: Vec<NodeId> = adj_ast(graph, p_id, Some(1), &[])
        .into_iter()
        .filter(|id| *id != n_id)
        .collect();

    let key_id = c_ids
        .first()
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
    let value_id = c_ids
        .last()
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    build_pair_node(args, n_id, key_id, value_id).map(Some)
}