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use rand::Rng;
/// Roll a single die with the specified number of sides.
pub fn roll_die(sides: u32) -> u32 {
let mut rng = rand::thread_rng();
rng.gen_range(1..=sides)
}
/// Parse and roll dice from a dice formula (e.g. "4d6+2" or "d12*3").
// TODO: Have rolls return a RollResult or something.
pub fn roll_formula(formula: &str) -> Option<u32> {
let delimiters = ['d', '+', '-', '*', '/']; // Only d implemented right now.
let parts: Vec<&str> = formula.split(|c| delimiters.contains(&c)).collect();
if parts.len() < 2 {
return None;
}
let num_dice = if parts[0].is_empty() {
1
} else {
match parts[0].parse::<u32>() {
Ok(num) => num,
Err(_) => return None,
}
};
let sides = match parts[1].parse::<u32>() {
Ok(num) => num,
Err(_) => return None,
};
let mut total = 0;
for _ in 0..num_dice {
let roll = roll_die(sides);
total += roll;
}
Some(total)
}
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