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use crate::errors::DiceError;
use crate::types::{DiceModifier, DiceResult, DiceRoll, Expression, VariableStore};
use rand::Rng;
pub struct DiceCalculator {
pub variables: VariableStore,
}
impl DiceCalculator {
pub fn new() -> Self {
Self {
variables: VariableStore::new(),
}
}
pub fn roll_dice(&mut self, dice: &DiceRoll) -> Result<Vec<Vec<i32>>, DiceError> {
if dice.count <= 0 || dice.sides <= 0 {
return Err(DiceError::InvalidExpression(
"骰子数量和面数必须大于0".to_string(),
));
}
let mut rolls = Vec::new();
for _ in 0..dice.count {
let mut roll = rand::random::<u32>() % dice.sides as u32 + 1;
let mut final_rolls = vec![roll as i32];
// handle exploded throwing
for modifier in &dice.modifiers {
match modifier {
DiceModifier::Explode => {
while roll == dice.sides as u32 {
roll = rand::random::<u32>() % dice.sides as u32 + 1;
final_rolls.push(roll as i32);
}
}
DiceModifier::ExplodeAlias => {
while roll == dice.sides as u32 {
roll = rand::random::<u32>() % dice.sides as u32 + 1;
final_rolls.push(roll as i32);
}
}
_ => {}
}
}
// handle reroll variants
for modifier in &dice.modifiers {
match modifier {
DiceModifier::Reroll(threshold) => {
if final_rolls.iter().any(|&r| r <= *threshold) {
let new_roll = rand::random::<u32>() % dice.sides as u32 + 1;
final_rolls = vec![new_roll as i32];
}
}
DiceModifier::RerollOnce(threshold) => {
if let Some(pos) = final_rolls.iter().position(|&r| r <= *threshold) {
let new_roll = rand::random::<u32>() % dice.sides as u32 + 1;
final_rolls[pos] = new_roll as i32;
}
}
DiceModifier::RerollUntil(threshold) => {
// keep rolling until > threshold (safety cap)
let mut current = *final_rolls.last().unwrap_or(&((roll) as i32));
let mut attempts = 0;
const MAX_ATTEMPTS: usize = 100;
while current <= *threshold && attempts < MAX_ATTEMPTS {
let new_roll = rand::random::<u32>() % dice.sides as u32 + 1;
current = new_roll as i32;
final_rolls = vec![current];
attempts += 1;
}
}
DiceModifier::RerollAndAdd(threshold) => {
// if <= threshold, roll again and add to the last value
if final_rolls.iter().any(|&r| r <= *threshold) {
let new_roll = rand::random::<u32>() % dice.sides as u32 + 1;
let mut sum = final_rolls.iter().sum::<i32>();
sum += new_roll as i32;
final_rolls = vec![sum];
}
}
_ => {}
}
}
rolls.push(final_rolls);
}
// handle keep alias before global aggregation
let mut final_rolls = rolls;
for modifier in &dice.modifiers {
if let DiceModifier::KeepAlias(n) = modifier {
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort_by(|a, b| b.cmp(a));
final_rolls = sorted.iter().take(*n as usize).map(|&v| vec![v]).collect();
}
}
// handle high/low, discard high/low and unique/sort/count
for modifier in &dice.modifiers {
match modifier {
DiceModifier::KeepHigh(n) => {
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort_by(|a, b| b.cmp(a));
final_rolls = sorted.iter().take(*n as usize).map(|&v| vec![v]).collect();
}
DiceModifier::KeepLow(n) => {
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort();
final_rolls = sorted.iter().take(*n as usize).map(|&v| vec![v]).collect();
}
DiceModifier::DropHigh(n) => {
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort_by(|a, b| b.cmp(a));
final_rolls = sorted.iter().skip(*n as usize).map(|&v| vec![v]).collect();
}
DiceModifier::DropLow(n) => {
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort();
final_rolls = sorted.iter().skip(*n as usize).map(|&v| vec![v]).collect();
}
DiceModifier::ExplodeKeepHigh(n) => {
// equivalent to explode then keep high n
let all_values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let mut sorted = all_values;
sorted.sort_by(|a, b| b.cmp(a));
final_rolls = sorted.iter().take(*n as usize).map(|&v| vec![v]).collect();
}
DiceModifier::Unique => {
use std::collections::HashSet;
let mut seen = HashSet::new();
let mut uniques: Vec<i32> = Vec::new();
for v in final_rolls.iter().flatten() {
if seen.insert(*v) {
uniques.push(*v);
}
}
final_rolls = uniques.into_iter().map(|v| vec![v]).collect();
}
DiceModifier::Sort => {
let mut values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
values.sort();
final_rolls = values.into_iter().map(|v| vec![v]).collect();
}
DiceModifier::Count(target) => {
let values: Vec<i32> = final_rolls.iter().flatten().cloned().collect();
let count = values.iter().filter(|&&v| v == *target).count() as i32;
final_rolls = vec![vec![count]];
}
_ => {}
}
}
Ok(final_rolls)
}
pub fn evaluate_expression(&mut self, expr: &Expression) -> Result<DiceResult, DiceError> {
match expr {
Expression::Number(n) => Ok(DiceResult {
expression: n.to_string(),
total: *n,
rolls: vec![],
details: format!("{}", n),
comment: None,
}),
Expression::DiceRoll(dice) => {
let rolls = self.roll_dice(dice)?;
let total: i32 = rolls.iter().flatten().sum();
let details = format!(
"{}d{}{} = {} (详情: {:?})",
dice.count,
dice.sides,
self.modifiers_to_string(&dice.modifiers),
total,
rolls
);
Ok(DiceResult {
expression: format!("{}d{}", dice.count, dice.sides),
total,
rolls,
details,
comment: None,
})
}
Expression::Add(left, right) => {
let left_result = self.evaluate_expression(left)?;
let right_result = self.evaluate_expression(right)?;
Ok(DiceResult {
expression: format!("({}) + ({})", left_result.expression, right_result.expression),
total: left_result.total + right_result.total,
rolls: [left_result.rolls, right_result.rolls].concat(),
details: format!("{} + {} = {}", left_result.total, right_result.total, left_result.total + right_result.total),
comment: None,
})
}
Expression::Subtract(left, right) => {
let left_result = self.evaluate_expression(left)?;
let right_result = self.evaluate_expression(right)?;
Ok(DiceResult {
expression: format!("({}) - ({})", left_result.expression, right_result.expression),
total: left_result.total - right_result.total,
rolls: [left_result.rolls, right_result.rolls].concat(),
details: format!("{} - {} = {}", left_result.total, right_result.total, left_result.total - right_result.total),
comment: None,
})
}
Expression::Multiply(left, right) => {
let left_result = self.evaluate_expression(left)?;
let right_result = self.evaluate_expression(right)?;
Ok(DiceResult {
expression: format!("({}) * ({})", left_result.expression, right_result.expression),
total: left_result.total * right_result.total,
rolls: [left_result.rolls, right_result.rolls].concat(),
details: format!("{} * {} = {}", left_result.total, right_result.total, left_result.total * right_result.total),
comment: None,
})
}
Expression::Divide(left, right) => {
let left_result = self.evaluate_expression(left)?;
let right_result = self.evaluate_expression(right)?;
if right_result.total == 0 {
return Err(DiceError::CalculationError("除零错误".to_string()));
}
Ok(DiceResult {
expression: format!("({}) / ({})", left_result.expression, right_result.expression),
total: left_result.total / right_result.total,
rolls: [left_result.rolls, right_result.rolls].concat(),
details: format!("{} / {} = {}", left_result.total, right_result.total, left_result.total / right_result.total),
comment: None,
})
}
Expression::Power(left, right) => {
let left_result = self.evaluate_expression(left)?;
let right_result = self.evaluate_expression(right)?;
let result = left_result.total.pow(right_result.total as u32);
Ok(DiceResult {
expression: format!("({}) ^ ({})", left_result.expression, right_result.expression),
total: result,
rolls: [left_result.rolls, right_result.rolls].concat(),
details: format!("{} ^ {} = {}", left_result.total, right_result.total, result),
comment: None,
})
}
Expression::Paren(expr) => self.evaluate_expression(expr),
Expression::WithComment(expr, comment) => {
let mut result = self.evaluate_expression(expr)?;
result.comment = comment.clone();
Ok(result)
}
}
}
pub fn modifiers_to_string(&self, modifiers: &[DiceModifier]) -> String {
let mut result = String::new();
for modifier in modifiers {
match modifier {
DiceModifier::Explode => result.push('!'),
DiceModifier::ExplodeAlias => result.push('e'),
DiceModifier::ExplodeKeepHigh(n) => result.push_str(&format!("K{}", n)),
DiceModifier::Reroll(n) => result.push_str(&format!("r{}", n)),
DiceModifier::RerollOnce(n) => result.push_str(&format!("ro{}", n)),
DiceModifier::RerollUntil(n) => result.push_str(&format!("R{}", n)),
DiceModifier::RerollAndAdd(n) => result.push_str(&format!("a{}", n)),
DiceModifier::KeepAlias(n) => result.push_str(&format!("k{}", n)),
DiceModifier::KeepHigh(n) => result.push_str(&format!("kh{}", n)),
DiceModifier::KeepLow(n) => result.push_str(&format!("kl{}", n)),
DiceModifier::DropHigh(n) => result.push_str(&format!("dh{}", n)),
DiceModifier::DropLow(n) => result.push_str(&format!("dl{}", n)),
DiceModifier::Unique => result.push('u'),
DiceModifier::Sort => result.push('s'),
DiceModifier::Count(v) => result.push_str(&format!("c{}", v)),
}
}
result
}
}
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