fluidattacks-blends-domain 0.6.1

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use alloc::borrow::ToOwned;

use crate::query::{adj_ast, label_text};
use crate::syntax::builders::unary_expression::build_unary_expression_node;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::{CodeGraph, NodeId};

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let children = adj_ast(args.ast_graph, n_id, None, &[]);
    let first_id = children
        .first()
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
    let second_id = children
        .get(1)
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
    let (operator_id, value_id) =
        if matches!(args.ast_graph.label_type(first_id), Some("++" | "--")) {
            (first_id, second_id)
        } else {
            (second_id, first_id)
        };
    let expression_type = label_text(args.ast_graph, operator_id)
        .map_or_else(|| "UpdateExpression".to_owned(), ToOwned::to_owned);
    build_unary_expression_node(args, n_id, expression_type, value_id).map(Some)
}