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Keep/Drop Function #92

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kg333 merged 12 commits from kg333/tenebrous-dicebot:keep_drop_function into master 2021-09-26 14:05:57 +00:00
Conversation 2 Commits 12 Files Changed 4 +20 -15
2 changed files with 20 additions and 15 deletions
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11
dicebot/src/basic/dice.rs
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@ -12,17 +12,22 @@ use std::ops::{Deref, DerefMut};
pub struct Dice { pub struct Dice {
pub(crate) count: u32, pub(crate) count: u32,
pub(crate) sides: u32, pub(crate) sides: u32,
pub(crate) keep: u32,
} }
impl fmt::Display for Dice { impl fmt::Display for Dice {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}d{}", self.count, self.sides) if self.keep == self. count {
write!(f, "{}d{}", self.count, self.sides)
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projectmoon commented 2021-09-22 19:51:54 +00:00
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Since you have if-else clauses here, it might make more sense to have a third enum member in addition to Keep and Drop, which indicates that we do nothing special with the roll.

Since you have if-else clauses here, it might make more sense to have a third enum member in addition to Keep and Drop, which indicates that we do nothing special with the roll.
kg333 commented 2021-09-25 03:04:43 +00:00
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Added another enum member called None and it's much cleaner. Although members with no type give my C-programmer soul the heebie-jeebies.

Added another enum member called None and it's much cleaner. Although members with no type give my C-programmer soul the heebie-jeebies.
} else {
write!(f, "{}d{}k{}", self.count, self.sides, self.keep)
}
} }
} }
impl Dice { impl Dice {
pub fn new(count: u32, sides: u32) -> Dice { pub fn new(count: u32, sides: u32, keep: u32) -> Dice {
Dice { count, sides } Dice { count, sides, keep }
} }
} }

24
dicebot/src/basic/parser.rs
View File

@ -36,7 +36,7 @@ fn parse_dice(input: &str) -> IResult<&str, Dice> {
let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?; let (input, (count, _, sides)) = tuple((digit1, tag("d"), digit1))(input)?;
Ok(( Ok((
input, input,
Dice::new(count.parse().unwrap(), sides.parse().unwrap()), Dice::new(count.parse().unwrap(), sides.parse().unwrap(), count.parse().unwrap()),
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projectmoon commented 2021-09-17 06:51:15 +00:00
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I think it is better to document what the keep expression actually is here, so tacking on "1dXkY" would be useful.

And since pattern matches are expressions, I think we can rewrite these two match blocks. Something like this:

let (keep, input) = match tuple::<&str, _, (_, _), _>((tag("k"), digit1))(input) {
    // if ok, keep expression is present
    Ok(r) => (r.0, r.1.1),
    // otherwise absent and keep all dice
    Err(_) => ("".to_string(), count)
};

The same should be doable for the drop expression. I think this way you can also get rid of the mut on input, because let in rust is not just a variable assignment. It actually creates a whole new variable binding.

Note: I haven't tested the above, but it should work. Or some variation of it should work.

I think it is better to document what the keep expression actually is here, so tacking on "1dXkY" would be useful. And since pattern matches are expressions, I think we can rewrite these two match blocks. Something like this: ```rust let (keep, input) = match tuple::<&str, _, (_, _), _>((tag("k"), digit1))(input) { // if ok, keep expression is present Ok(r) => (r.0, r.1.1), // otherwise absent and keep all dice Err(_) => ("".to_string(), count) }; ``` The same should be doable for the drop expression. I think this way you can also get rid of the `mut` on input, because `let` in rust is not just a variable assignment. It actually creates a whole new variable binding. Note: I haven't tested the above, but it should work. Or some variation of it should work.
)) ))
} }
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projectmoon commented 2021-09-22 19:53:33 +00:00
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Rust supports tuple destructuring in pattern matching, which may be useful here and the other match:

Ok((rest, (_, keep_amount)) => ...

rest being the rest of the input in this case.

Rust supports tuple destructuring in pattern matching, which may be useful here and the other match: ```rust Ok((rest, (_, keep_amount)) => ... ``` `rest` being the rest of the input in this case.
kg333 commented 2021-09-25 02:58:04 +00:00
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Ooh, that's much more human-readable, thanks!

Ooh, that's much more human-readable, thanks!
@ -108,16 +108,16 @@ mod tests {
use super::*; use super::*;
#[test] #[test]
fn dice_test() { fn dice_test() {
assert_eq!(parse_dice("2d4"), Ok(("", Dice::new(2, 4)))); assert_eq!(parse_dice("2d4"), Ok(("", Dice::new(2, 4, 2))));
assert_eq!(parse_dice("20d40"), Ok(("", Dice::new(20, 40)))); assert_eq!(parse_dice("20d40"), Ok(("", Dice::new(20, 40, 20))));
assert_eq!(parse_dice("8d7"), Ok(("", Dice::new(8, 7)))); assert_eq!(parse_dice("8d7"), Ok(("", Dice::new(8, 7, 8))));
} }
#[test] #[test]
fn element_test() { fn element_test() {
assert_eq!( assert_eq!(
parse_element(" \t\n\r\n 8d7 \n"), parse_element(" \t\n\r\n 8d7 \n"),
Ok((" \n", Element::Dice(Dice::new(8, 7)))) Ok((" \n", Element::Dice(Dice::new(8, 7, 8))))
); );
assert_eq!( assert_eq!(
parse_element(" \t\n\r\n 8 \n"), parse_element(" \t\n\r\n 8 \n"),
@ -139,14 +139,14 @@ mod tests {
parse_signed_element(" \t\n\r\n- 8d4 \n"), parse_signed_element(" \t\n\r\n- 8d4 \n"),
Ok(( Ok((
" \n", " \n",
SignedElement::Negative(Element::Dice(Dice::new(8, 4))) SignedElement::Negative(Element::Dice(Dice::new(8, 4, 8)))
)) ))
); );
assert_eq!( assert_eq!(
parse_signed_element(" \t\n\r\n+ 8d4 \n"), parse_signed_element(" \t\n\r\n+ 8d4 \n"),
Ok(( Ok((
" \n", " \n",
SignedElement::Positive(Element::Dice(Dice::new(8, 4))) SignedElement::Positive(Element::Dice(Dice::new(8, 4, 8)))
)) ))
); );
} }
@ -158,7 +158,7 @@ mod tests {
Ok(( Ok((
"", "",
ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new( ElementExpression(vec![SignedElement::Positive(Element::Dice(Dice::new(
8, 4 8, 4, 8
)))]) )))])
)) ))
); );
@ -167,7 +167,7 @@ mod tests {
Ok(( Ok((
" \n ", " \n ",
ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new( ElementExpression(vec![SignedElement::Negative(Element::Dice(Dice::new(
8, 4 8, 4, 8
)))]) )))])
)) ))
); );
@ -176,11 +176,11 @@ mod tests {
Ok(( Ok((
" 1d5 ", " 1d5 ",
ElementExpression(vec![ ElementExpression(vec![
SignedElement::Positive(Element::Dice(Dice::new(3, 4))), SignedElement::Positive(Element::Dice(Dice::new(3, 4, 3))),
SignedElement::Positive(Element::Bonus(7)), SignedElement::Positive(Element::Bonus(7)),
SignedElement::Negative(Element::Bonus(5)), SignedElement::Negative(Element::Bonus(5)),
SignedElement::Negative(Element::Dice(Dice::new(6, 12))), SignedElement::Negative(Element::Dice(Dice::new(6, 12, 6))),
SignedElement::Positive(Element::Dice(Dice::new(1, 1))), SignedElement::Positive(Element::Dice(Dice::new(1, 1, 1))),
SignedElement::Positive(Element::Bonus(53)), SignedElement::Positive(Element::Bonus(53)),
]) ])
)) ))