tenebrous-dicebot/src/basic/roll.rs

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/**
* In addition to the terms of the AGPL, this file is governed by the
* terms of the MIT license, from the original axfive-matrix-dicebot
* project.
*/
use crate::basic::dice;
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use rand::prelude::*;
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use std::fmt;
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use std::ops::{Deref, DerefMut};
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pub trait Roll {
type Output;
fn roll(&self) -> Self::Output;
}
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pub trait Rolled {
fn rolled_value(&self) -> i32;
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct DiceRoll(pub Vec<u32>);
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impl DiceRoll {
pub fn rolls(&self) -> &[u32] {
&self.0
}
pub fn total(&self) -> u32 {
self.0.iter().sum()
}
}
impl Rolled for DiceRoll {
fn rolled_value(&self) -> i32 {
self.total() as i32
}
}
impl fmt::Display for DiceRoll {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.rolled_value())?;
let rolls = self.rolls();
let mut iter = rolls.iter();
if let Some(first) = iter.next() {
write!(f, " ({}", first)?;
for roll in iter {
write!(f, " + {}", roll)?;
}
write!(f, ")")?;
}
Ok(())
}
}
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impl Roll for dice::Dice {
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type Output = DiceRoll;
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fn roll(&self) -> DiceRoll {
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let mut rng = rand::thread_rng();
let rolls: Vec<_> = (0..self.count)
.map(|_| rng.gen_range(1..=self.sides))
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.collect();
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DiceRoll(rolls)
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum ElementRoll {
Dice(DiceRoll),
Bonus(u32),
}
impl Rolled for ElementRoll {
fn rolled_value(&self) -> i32 {
match self {
ElementRoll::Dice(d) => d.rolled_value(),
ElementRoll::Bonus(b) => *b as i32,
}
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}
}
impl Roll for dice::Element {
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type Output = ElementRoll;
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fn roll(&self) -> ElementRoll {
match self {
dice::Element::Dice(d) => ElementRoll::Dice(d.roll()),
dice::Element::Bonus(b) => ElementRoll::Bonus(*b),
}
}
}
impl fmt::Display for ElementRoll {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ElementRoll::Dice(d) => write!(f, "{}", d),
ElementRoll::Bonus(b) => write!(f, "{}", b),
}
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum SignedElementRoll {
Positive(ElementRoll),
Negative(ElementRoll),
}
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impl Rolled for SignedElementRoll {
fn rolled_value(&self) -> i32 {
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match self {
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SignedElementRoll::Positive(e) => e.rolled_value(),
SignedElementRoll::Negative(e) => -e.rolled_value(),
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}
}
}
impl Roll for dice::SignedElement {
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type Output = SignedElementRoll;
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fn roll(&self) -> SignedElementRoll {
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match self {
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dice::SignedElement::Positive(e) => SignedElementRoll::Positive(e.roll()),
dice::SignedElement::Negative(e) => SignedElementRoll::Negative(e.roll()),
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}
}
}
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impl fmt::Display for SignedElementRoll {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
SignedElementRoll::Positive(e) => write!(f, "{}", e),
SignedElementRoll::Negative(e) => write!(f, "-{}", e),
}
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct ElementExpressionRoll(Vec<SignedElementRoll>);
impl Deref for ElementExpressionRoll {
type Target = Vec<SignedElementRoll>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for ElementExpressionRoll {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl Rolled for ElementExpressionRoll {
fn rolled_value(&self) -> i32 {
self.iter().map(Rolled::rolled_value).sum()
}
}
impl Roll for dice::ElementExpression {
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type Output = ElementExpressionRoll;
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fn roll(&self) -> ElementExpressionRoll {
ElementExpressionRoll(self.iter().map(Roll::roll).collect())
}
}
impl fmt::Display for ElementExpressionRoll {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.len() > 1 {
write!(f, "{}", self.rolled_value())?;
let mut iter = self.0.iter();
if let Some(first) = iter.next() {
write!(f, " ({}", first)?;
for roll in iter {
match roll {
SignedElementRoll::Positive(e) => write!(f, " + {}", e)?,
SignedElementRoll::Negative(e) => write!(f, " - {}", e)?,
}
}
write!(f, ")")?;
}
Ok(())
} else if self.len() > 0 {
// For a single item, just show the inner item to avoid redundancy
let first = self.0.iter().next().unwrap();
write!(f, "{}", first)
} else {
write!(f, "0")
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn dice_roll_display_test() {
assert_eq!(DiceRoll(vec![1, 3, 4]).to_string(), "8 (1 + 3 + 4)");
assert_eq!(DiceRoll(vec![]).to_string(), "0");
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assert_eq!(
DiceRoll(vec![4, 7, 2, 10]).to_string(),
"23 (4 + 7 + 2 + 10)"
);
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}
#[test]
fn element_roll_display_test() {
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assert_eq!(
ElementRoll::Dice(DiceRoll(vec![1, 3, 4])).to_string(),
"8 (1 + 3 + 4)"
);
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assert_eq!(ElementRoll::Bonus(7).to_string(), "7");
}
#[test]
fn signed_element_roll_display_test() {
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assert_eq!(
SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
"8 (1 + 3 + 4)"
);
assert_eq!(
SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))).to_string(),
"-8 (1 + 3 + 4)"
);
assert_eq!(
SignedElementRoll::Positive(ElementRoll::Bonus(7)).to_string(),
"7"
);
assert_eq!(
SignedElementRoll::Negative(ElementRoll::Bonus(7)).to_string(),
"-7"
);
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}
#[test]
fn element_expression_roll_display_test() {
assert_eq!(
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ElementExpressionRoll(vec![SignedElementRoll::Positive(ElementRoll::Dice(
DiceRoll(vec![1, 3, 4])
)),])
.to_string(),
"8 (1 + 3 + 4)"
);
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assert_eq!(
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ElementExpressionRoll(vec![SignedElementRoll::Negative(ElementRoll::Dice(
DiceRoll(vec![1, 3, 4])
)),])
.to_string(),
"-8 (1 + 3 + 4)"
);
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assert_eq!(
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ElementExpressionRoll(vec![SignedElementRoll::Positive(ElementRoll::Bonus(7)),])
.to_string(),
"7"
);
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assert_eq!(
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ElementExpressionRoll(vec![SignedElementRoll::Negative(ElementRoll::Bonus(7)),])
.to_string(),
"-7"
);
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assert_eq!(
ElementExpressionRoll(vec![
SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
SignedElementRoll::Positive(ElementRoll::Bonus(4)),
SignedElementRoll::Negative(ElementRoll::Bonus(7)),
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])
.to_string(),
"2 (8 (1 + 3 + 4) - 3 (1 + 2) + 4 - 7)"
);
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assert_eq!(
ElementExpressionRoll(vec![
SignedElementRoll::Negative(ElementRoll::Dice(DiceRoll(vec![1, 3, 4]))),
SignedElementRoll::Positive(ElementRoll::Dice(DiceRoll(vec![1, 2]))),
SignedElementRoll::Negative(ElementRoll::Bonus(4)),
SignedElementRoll::Positive(ElementRoll::Bonus(7)),
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])
.to_string(),
"-2 (-8 (1 + 3 + 4) + 3 (1 + 2) - 4 + 7)"
);
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}
}