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::{
            for_each_statement::build_for_each_statement_node,
            for_statement::build_for_statement_node,
        },
        fields::{swift::for_statement, Field},
        SyntaxGraphArgs, SyntaxGraphError,
    },
    NodeId,
};

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    const COLLECTION: Field<false> = Field::new("collection_id");

    let graph = args.ast_graph;
    let childs = adj_ast(graph, n_id, Some(1), &[]);
    let body_id = match_ast_d(graph, n_id, "statements", Some(1))
        .or_else(|| childs.iter().rev().nth(1).copied())
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let var_node = args.required_field_alt(n_id, for_statement::ITEM)?;

    if let Some(it_item) = args.optional_field_alt(n_id, COLLECTION) {
        return build_for_each_statement_node(args, n_id, var_node, it_item, Some(body_id))
            .map(Some);
    }

    build_for_statement_node(args, n_id, None, None, None, body_id).map(Some)
}