forked from projectmoon/tenebrous-dicebot
Adding parsing for keeping highest dice
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2654887d8c
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1860eaf378
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@ -33,10 +33,22 @@ enum Sign {
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// Parse a dice expression. Does not eat whitespace
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fn parse_dice(input: &str) -> IResult<&str, Dice> {
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let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
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// parse main dice expression
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let (mut input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
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// check for keep expression (i.e. D&D 5E Advantage)
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let keep;
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match tuple::<&str, _, (_, _), _>((tag("k"), digit1))(input) {
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// if ok, keep expression is present
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Ok(r) => {
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input = r.0;
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keep = r.1.1;
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}
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// otherwise absent and keep all dice
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Err(_) => keep = count,
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};
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Ok((
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input,
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Dice::new(count.parse().unwrap(), sides.parse().unwrap(), count.parse().unwrap()),
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Dice::new(count.parse().unwrap(), sides.parse().unwrap(), keep.parse().unwrap()),
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))
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}
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@ -111,6 +123,8 @@ mod tests {
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assert_eq!(parse_dice("2d4"), Ok(("", Dice::new(2, 4, 2))));
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assert_eq!(parse_dice("20d40"), Ok(("", Dice::new(20, 40, 20))));
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assert_eq!(parse_dice("8d7"), Ok(("", Dice::new(8, 7, 8))));
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assert_eq!(parse_dice("2d20k1"), Ok(("", Dice::new(2, 20, 1))));
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assert_eq!(parse_dice("100d10k90"), Ok(("", Dice::new(100, 10, 90))));
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}
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#[test]
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@ -119,6 +133,10 @@ mod tests {
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parse_element(" \t\n\r\n 8d7 \n"),
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Ok((" \n", Element::Dice(Dice::new(8, 7, 8))))
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);
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assert_eq!(
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parse_element(" \t\n\r\n 3d20k2 \n"),
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Ok((" \n", Element::Dice(Dice::new(3, 20, 2))))
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);
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assert_eq!(
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parse_element(" \t\n\r\n 8 \n"),
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Ok((" \n", Element::Bonus(8)))
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@ -142,6 +160,13 @@ mod tests {
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SignedElement::Negative(Element::Dice(Dice::new(8, 4, 8)))
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))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n- 8d4k4 \n"),
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Ok((
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" \n",
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SignedElement::Negative(Element::Dice(Dice::new(8, 4, 4)))
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))
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);
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assert_eq!(
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parse_signed_element(" \t\n\r\n+ 8d4 \n"),
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Ok((
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@ -162,6 +187,16 @@ mod tests {
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)))])
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))
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);
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assert_eq!(
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parse_element_expression("\t2d20k1 + 5"),
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Ok((
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"",
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ElementExpression(vec![
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SignedElement::Positive(Element::Dice(Dice::new(2, 20, 1))),
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SignedElement::Positive(Element::Bonus(5)),
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])
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))
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);
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assert_eq!(
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parse_element_expression(" - 8d4 \n "),
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Ok((
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