Function evaluate_prefix_unary

crates/gitql-engine/src/engine_evaluator.rs:320–333

(
    env: &mut Environment,
    expr: &UnaryExpr,
    titles: &[String],
    object: &Vec<Box<dyn Value>>,
)

}

fn evaluate_prefix_unary(
    env: &mut Environment,
    expr: &UnaryExpr,
    titles: &[String],
    object: &Vec<Box<dyn Value>>,
) -> Result<Box<dyn Value>, String> {
    let rhs = evaluate_expression(env, &expr.right, titles, object)?;
    match expr.operator {
        PrefixUnaryOperator::Plus => rhs.plus_op(),
        PrefixUnaryOperator::Minus => rhs.neg_op(),
        PrefixUnaryOperator::Bang => rhs.bang_op(),
        PrefixUnaryOperator::Not => rhs.not_op(),
    }
}

fn evaluate_arithmetic(
    env: &mut Environment,