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Updating match blocks for keep/drop

This commit is contained in:
Matthew Sparks 2021-09-17 21:45:30 -04:00
parent 8317f40f61
commit f904e3a948
1 changed files with 11 additions and 19 deletions
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30
dicebot/src/basic/parser.rs
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@ -31,33 +31,25 @@ enum Sign {
Minus,
}
// Parse a dice expression. Does not eat whitespace
/// Parse a dice expression. Does not eat whitespace
fn parse_dice(input: &str) -> IResult<&str, Dice> {
// parse main dice expression
let (mut input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
// check for keep expression (i.e. D&D 5E Advantage)
let keep;
match tuple::<&str, _, (_, _), _>((tag("k"), digit1))(input) {
// check for keep expression to keep highest dice (2d20k1)
let (keep, input) = match tuple::<&str, _, (_, _), _>((tag("k"), digit1))(input) {
// if ok, keep expression is present
Ok(r) => {
input = r.0;
keep = r.1.1;
}
Ok(r) => (r.1.1, r.0),
// otherwise absent and keep all dice
Err(_) => keep = count,
Err(_) => (input, "")
};
// check for drop expression (i.e. D&D 5E Disadvantage)
let drop;
match tuple::<&str, _, (_, _), _>((tag("d"), digit1))(input) {
// if ok, drop expression is present
Ok(r) => {
input = r.0;
drop = r.1.1;
}
// check for drop expression to drop highest dice (2d20dh1)
let (drop, input) = match tuple::<&str, _, (_, _), _>((tag("dh"), digit1))(input) {
// if ok, keep expression is present
Ok(r) => (r.1.1, r.0),
// otherwise absent and keep all dice
Err(_) => drop = "0",
Err(_) => (input, "")
};
let count: u32 = count.parse().unwrap();