Function evaluate_arithmetic

crates/gitql-engine/src/engine_evaluator.rs:335–351

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

}

fn evaluate_arithmetic(
    env: &mut Environment,
    expr: &ArithmeticExpr,
    titles: &[String],
    object: &Vec<Box<dyn Value>>,
) -> Result<Box<dyn Value>, String> {
    let lhs = evaluate_expression(env, &expr.left, titles, object)?;
    let rhs = evaluate_expression(env, &expr.right, titles, object)?;
    match expr.operator {
        ArithmeticOperator::Plus => lhs.add_op(&rhs),
        ArithmeticOperator::Minus => lhs.sub_op(&rhs),
        ArithmeticOperator::Star => lhs.mul_op(&rhs),
        ArithmeticOperator::Slash => lhs.div_op(&rhs),
        ArithmeticOperator::Modulus => lhs.rem_op(&rhs),
        ArithmeticOperator::Exponentiation => lhs.caret_op(&rhs),
    }
}

fn evaluate_comparison(
    env: &mut Environment,