fluidattacks-blends-domain 0.30.0

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use crate::{
    query::{adj_ast, match_ast_d},
    syntax::{
        builders::switch_section::build_switch_section_node, SyntaxGraphArgs, SyntaxGraphError,
    },
    utilities::text_nodes::node_to_str,
    NodeId,
};
use alloc::vec::Vec;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let statements_id = match_ast_d(graph, n_id, "statements", Some(1))
        .or_else(|| adj_ast(graph, n_id, Some(1), &[]).last().copied())
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let child_ids: Vec<NodeId> = adj_ast(graph, statements_id, Some(1), &[]);

    let val_id = match_ast_d(graph, n_id, "switch_pattern", Some(1))
        .or_else(|| adj_ast(graph, n_id, Some(1), &[]).first().copied())
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let case_expr = node_to_str(graph, val_id);

    build_switch_section_node(args, n_id, case_expr, &child_ids).map(Some)
}