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, match_ast, match_ast_group_d},
    syntax::{
        builders::{
            reserved_word::build_reserved_word_node, try_statement::build_try_statement_node,
        },
        SyntaxGraphArgs, SyntaxGraphError,
    },
    NodeId,
};
use alloc::borrow::ToOwned;

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

    let childs = match_ast(graph, n_id, &["call", "assignment"], Some(1));

    let block_node = if let Some(id) = childs.get("assignment").copied().flatten() {
        id
    } else {
        let direct_children = adj_ast(graph, n_id, Some(1), &[]);
        if direct_children.len() < 2 {
            return Ok(Some(build_reserved_word_node(
                args,
                n_id,
                "begin".to_owned(),
            )));
        }
        *direct_children
            .get(1)
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?
    };

    let try_block_id = childs.get("call").copied().flatten();
    let catch_block = match_ast_group_d(graph, n_id, "rescue", Some(1));

    build_try_statement_node(args, n_id, block_node, &catch_block, try_block_id, None).map(Some)
}