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, label_text, match_ast_d},
    syntax::{
        builders::variable_declaration::build_variable_declaration_node, SyntaxGraphArgs,
        SyntaxGraphError,
    },
    utilities::text_nodes::node_to_str,
    NodeId,
};
use alloc::borrow::ToOwned;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;

    let element_id = match_ast_d(graph, n_id, "const_element", Some(1)).unwrap_or(n_id);
    let c_ids = adj_ast(graph, element_id, Some(1), &[]);

    let var_id = c_ids.first().copied();

    let var_name = var_id
        .and_then(|id| label_text(graph, id))
        .filter(|s| !s.is_empty())
        .map_or_else(|| node_to_str(graph, n_id), str::to_owned);

    let value_id = c_ids.get(2).copied();

    build_variable_declaration_node(args, n_id, var_name, None, value_id, None, None).map(Some)
}