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_d};
use crate::syntax::builders::switch_statement::build_switch_statement_node;
use crate::syntax::fields::Field;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::NodeId;

const INITIALIZER: Field<false> = Field::new("initializer_id");
const VALUE: Field<false> = Field::new("value_id");

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

    let body_id = match_ast_d(graph, n_id, "switch", None)
        .or_else(|| adj_ast(graph, n_id, None, &[]).first().copied())
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let value_id = args
        .optional_field_alt(n_id, INITIALIZER)
        .or_else(|| args.optional_field_alt(n_id, VALUE))
        .or_else(|| adj_ast(graph, n_id, None, &[]).get(2).copied())
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    build_switch_statement_node(args, n_id, body_id, value_id).map(Some)
}