fix: floating point arithmetic is shaky
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https://floating-point-gui.de/
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3 changed files with 530 additions and 128 deletions
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|
||||
checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
|
||||
|
||||
[[package]]
|
||||
name = "toml"
|
||||
version = "0.5.11"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
|
||||
dependencies = [
|
||||
"serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.11"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
|
||||
|
||||
[[package]]
|
||||
name = "uuid"
|
||||
version = "1.4.1"
|
||||
|
|
@ -48,8 +449,23 @@ dependencies = [
|
|||
"serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "version_check"
|
||||
version = "0.9.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
|
||||
|
||||
[[package]]
|
||||
name = "wasi"
|
||||
version = "0.11.0+wasi-snapshot-preview1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
|
||||
|
||||
[[package]]
|
||||
name = "wyz"
|
||||
version = "0.5.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
|
||||
dependencies = [
|
||||
"tap",
|
||||
]
|
||||
|
|
|
|||
|
|
@ -12,4 +12,6 @@ edition = "2021"
|
|||
#build = "build.rs"
|
||||
|
||||
[dependencies]
|
||||
rust_decimal = "1.31.0"
|
||||
rust_decimal_macros = "1.31.0"
|
||||
uuid = { version = "1.4.1", features = ["v4", "serde"] }
|
||||
|
|
|
|||
240
src/lib.rs
240
src/lib.rs
|
|
@ -17,18 +17,16 @@
|
|||
use std::collections::HashMap;
|
||||
use std::rc::Rc;
|
||||
|
||||
use rust_decimal::prelude::*;
|
||||
use rust_decimal_macros::dec;
|
||||
use uuid::Uuid;
|
||||
|
||||
pub trait Purchasable {
|
||||
fn cost(&self) -> f64;
|
||||
fn cost(&self) -> Decimal;
|
||||
fn name(&self) -> &str;
|
||||
fn paid_by(&self) -> Rc<dyn Actor>;
|
||||
}
|
||||
|
||||
pub fn money_owned(splits: &[Split]) {
|
||||
for split in splits.iter() {}
|
||||
}
|
||||
|
||||
#[derive(Clone)]
|
||||
pub struct Split {
|
||||
purchase: Rc<dyn Purchasable>,
|
||||
|
|
@ -36,68 +34,78 @@ pub struct Split {
|
|||
parties: Vec<Rc<dyn Actor>>,
|
||||
}
|
||||
|
||||
|
||||
//#[derive(Clone)]
|
||||
//pub struct Split {
|
||||
// shares: ShareHashMap,
|
||||
// paid_by: Rc<dyn Actor>,
|
||||
//}
|
||||
|
||||
impl Split {
|
||||
pub fn new(purchase: Rc<dyn Purchasable>, split_strategy: SplitStrategy, parties: Vec<Rc<dyn Actor>>) -> Self {
|
||||
pub fn new(
|
||||
purchase: Rc<dyn Purchasable>,
|
||||
split_strategy: SplitStrategy,
|
||||
parties: Vec<Rc<dyn Actor>>,
|
||||
) -> Self {
|
||||
Self {
|
||||
split_strategy, parties, purchase
|
||||
split_strategy,
|
||||
parties,
|
||||
purchase,
|
||||
}
|
||||
}
|
||||
|
||||
// pub fn iter(&self) -> SplitIter {
|
||||
// let iter = self.shares.iter();
|
||||
// let paid_by = self.paid_by;
|
||||
// SplitIter { iter, paid_by}
|
||||
// }
|
||||
//
|
||||
// pub fn insert(&mut self, actor: Rc<dyn Actor>, amount: f64) {
|
||||
// let name = actor.name().to_owned();
|
||||
// self.shares.insert(name, (actor, amount));
|
||||
// }
|
||||
pub fn money_owed(&self) -> ShareHashMap {
|
||||
match &self.split_strategy {
|
||||
SplitStrategy::Unequal(shares) => {
|
||||
let mut s = shares.clone();
|
||||
let payer = self.purchase.paid_by();
|
||||
if let Some((_, money)) = s.get_mut(payer.name()) {
|
||||
*money = dec!(0.0);
|
||||
}
|
||||
s
|
||||
}
|
||||
SplitStrategy::Equal => {
|
||||
let mut shares = ShareHashMap::default();
|
||||
let cost = self.purchase.cost();
|
||||
let total_parties = Decimal::new(self.parties.len() as i64, 0);
|
||||
for actor in self.parties.iter() {
|
||||
if *actor == self.purchase.paid_by() {
|
||||
shares.insert(actor.name().to_owned(), (actor.clone(), dec!(0.00)));
|
||||
} else {
|
||||
shares.insert(
|
||||
actor.name().to_owned(),
|
||||
(actor.clone(), cost / total_parties),
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get(&mut self, actor: Rc<dyn Actor>) -> Option<f64> {
|
||||
shares
|
||||
}
|
||||
SplitStrategy::Shares(c) => {
|
||||
let mut shares = ShareHashMap::default();
|
||||
let cost = self.purchase.cost();
|
||||
for (actor_name, (actor, share)) in c.iter() {
|
||||
//if actor.name() == split.purchase.paid_by().name() {
|
||||
if *actor == self.purchase.paid_by() {
|
||||
shares.insert(actor_name.clone(), (actor.clone(), dec!(0.00)));
|
||||
} else {
|
||||
shares.insert(actor_name.clone(), (actor.clone(), cost * share));
|
||||
}
|
||||
}
|
||||
shares
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get(&mut self, actor: Rc<dyn Actor>) -> Option<Decimal> {
|
||||
unimplemented!();
|
||||
// if let Some((_actor, cost)) = self.shares.get(actor.name()) {
|
||||
// Some(*cost)
|
||||
// } else {
|
||||
// None
|
||||
// }
|
||||
}
|
||||
}
|
||||
// if let Some((_actor, cost)) = self.shares.get(actor.name()) {
|
||||
// Some(*cost)
|
||||
// } else {
|
||||
// None
|
||||
// }
|
||||
}
|
||||
|
||||
//pub struct SplitIter<'a> {
|
||||
// iter: std::collections::hash_map::Iter<'a, String, (Rc<dyn Actor>, f64)>,
|
||||
// paid_by: Rc<dyn Actor>,
|
||||
//}
|
||||
//
|
||||
//impl<'a> Iterator for SplitIter<'a> {
|
||||
// type Item = (Rc<dyn Actor>, f64);
|
||||
//
|
||||
// fn next(&mut self) -> Option<Self::Item> {
|
||||
// if let Some((_, (actor, cost))) = self.iter.next() {
|
||||
// Some((actor.clone(), *cost))
|
||||
// } else {
|
||||
// None
|
||||
// }
|
||||
// }
|
||||
//}
|
||||
|
||||
impl Split {
|
||||
pub fn validate(&self) -> bool {
|
||||
self.split_strategy.validate(&self)
|
||||
self.split_strategy.validate(self.purchase.as_ref())
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// key is a string for getting Eq and PartialEq w object safety
|
||||
pub type ShareHashMap = HashMap<String, (Rc<dyn Actor>, f64)>;
|
||||
|
||||
pub type ShareHashMap = HashMap<String, (Rc<dyn Actor>, Decimal)>;
|
||||
|
||||
/*
|
||||
* SPLITTING STRATEGIES:
|
||||
|
|
@ -113,74 +121,35 @@ pub enum SplitStrategy {
|
|||
}
|
||||
|
||||
impl SplitStrategy {
|
||||
pub fn validate(&self, split: &Split) -> bool {
|
||||
fn validate(&self, purchase: &dyn Purchasable) -> bool {
|
||||
match self {
|
||||
SplitStrategy::Unequal(shares) => {
|
||||
let mut total = 0.00;
|
||||
let mut total = dec!(0.00);
|
||||
for (_actor_str, (_actor_obj, share)) in shares.iter() {
|
||||
total += share;
|
||||
}
|
||||
|
||||
let cost = split.purchase.cost();
|
||||
let cost = purchase.cost();
|
||||
println!("Unequal sharing: expected {cost} got {total}");
|
||||
total == cost
|
||||
}
|
||||
SplitStrategy::Shares(shares) => {
|
||||
let mut total = 0.00;
|
||||
let cost = split.purchase.cost();
|
||||
let mut total_shares = 0.00;
|
||||
let mut total = dec!(0.00);
|
||||
let cost = purchase.cost();
|
||||
let mut total_shares = dec!(0.00);
|
||||
for (_actor_str, (_actor_obj, share)) in shares.iter() {
|
||||
total_shares += share;
|
||||
total += cost * share;
|
||||
println!("Shares: {:?}, total: {total_shares}", share);
|
||||
}
|
||||
|
||||
println!("Unequal sharing: expected shares 1 got {total_shares}");
|
||||
println!("Unequal sharing: expected {cost} got {total}");
|
||||
total_shares == 1.00 && total == cost
|
||||
total_shares == dec!(1.00) && total == cost
|
||||
}
|
||||
SplitStrategy::Equal => true,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn money_owed(&self, split: &Split) -> ShareHashMap {
|
||||
match self {
|
||||
SplitStrategy::Unequal(shares) => {
|
||||
let mut s = shares.clone();
|
||||
let payer = split.purchase.paid_by();
|
||||
if let Some((_,money)) = s.get_mut(payer.name()) {
|
||||
*money = 0.0;
|
||||
}
|
||||
s
|
||||
|
||||
}
|
||||
SplitStrategy::Equal => {
|
||||
let mut shares = ShareHashMap::default();
|
||||
let cost = split.purchase.cost();
|
||||
for actor in split.parties.iter() {
|
||||
if *actor == split.purchase.paid_by() {
|
||||
shares.insert(actor.name().to_owned(), (actor.clone(), 0.00));
|
||||
} else {
|
||||
shares.insert(actor.name().to_owned(), (actor.clone(), cost / split.parties.len() as f64));
|
||||
}
|
||||
}
|
||||
|
||||
shares
|
||||
}
|
||||
SplitStrategy::Shares(c) => {
|
||||
let mut shares = ShareHashMap::default();
|
||||
let cost = split.purchase.cost();
|
||||
for (actor_name,(actor, share)) in c.iter() {
|
||||
//if actor.name() == split.purchase.paid_by().name() {
|
||||
if *actor == split.purchase.paid_by() {
|
||||
shares.insert(actor_name.clone(), (actor.clone(), 0.00));
|
||||
} else {
|
||||
shares.insert(actor_name.clone(), (actor.clone(), cost * share));
|
||||
}
|
||||
}
|
||||
shares
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub trait Actor {
|
||||
|
|
@ -209,7 +178,12 @@ impl Person {
|
|||
let owes = Vec::default();
|
||||
let spent = Vec::default();
|
||||
|
||||
Self { name, spent, owes, id}
|
||||
Self {
|
||||
name,
|
||||
spent,
|
||||
owes,
|
||||
id,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -234,23 +208,22 @@ impl Actor for Person {
|
|||
fn id(&self) -> &Uuid {
|
||||
&self.id
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
pub struct Item {
|
||||
cost: f64,
|
||||
cost: Decimal,
|
||||
name: String,
|
||||
payer: Rc<dyn Actor>,
|
||||
}
|
||||
|
||||
impl Item {
|
||||
pub fn new(name: String, cost: f64, payer: Rc<dyn Actor>) -> Self {
|
||||
pub fn new(name: String, cost: Decimal, payer: Rc<dyn Actor>) -> Self {
|
||||
Self { cost, name, payer }
|
||||
}
|
||||
}
|
||||
|
||||
impl Purchasable for Item {
|
||||
fn cost(&self) -> f64 {
|
||||
fn cost(&self) -> Decimal {
|
||||
self.cost
|
||||
}
|
||||
fn name(&self) -> &str {
|
||||
|
|
@ -278,45 +251,47 @@ mod tests {
|
|||
let person3: Rc<dyn Actor> = Rc::new(Person::new("person3".into(), Uuid::new_v4()));
|
||||
let person4: Rc<dyn Actor> = Rc::new(Person::new("person4".into(), Uuid::new_v4()));
|
||||
|
||||
let item = Item::new("test item".into(), 240.00, person1.clone());
|
||||
let item = Item::new("test item".into(), dec!(240.00), person1.clone());
|
||||
let actors = vec![
|
||||
person1.clone(),
|
||||
person2.clone(),
|
||||
person3.clone(),
|
||||
person4.clone(),
|
||||
];
|
||||
|
||||
|
||||
// equal split
|
||||
let strategy = SplitStrategy::Equal;
|
||||
|
||||
let mut split = Split::new(Rc::new(item), strategy, actors);
|
||||
assert!(split.split_strategy.validate(&split));
|
||||
let dues = split.split_strategy.money_owed(&split);
|
||||
for (_actor_name,(actor, due)) in dues.iter() {
|
||||
assert!(split.validate());
|
||||
let dues = split.money_owed();
|
||||
for (_actor_name, (actor, due)) in dues.iter() {
|
||||
if split.purchase.paid_by().name() == actor.name() {
|
||||
assert_eq!(*due, 0.00);
|
||||
assert_eq!(*due, dec!(0.00));
|
||||
} else {
|
||||
assert_eq!(*due, split.purchase.cost() / split.parties.len() as f64);
|
||||
assert_eq!(
|
||||
*due,
|
||||
split.purchase.cost() / Decimal::new(split.parties.len() as i64, 0)
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
// share split
|
||||
let mut shares = ShareHashMap::default();
|
||||
shares.insert(person1.name().to_owned(), (person1.clone(), 0.3));
|
||||
shares.insert(person2.name().to_owned(), (person2.clone(), 0.4));
|
||||
shares.insert(person3.name().to_owned(), (person3.clone(), 0.2));
|
||||
shares.insert(person4.name().to_owned(), (person4.clone(), 0.1));
|
||||
shares.insert(person1.name().to_owned(), (person1.clone(), dec!(0.3)));
|
||||
shares.insert(person2.name().to_owned(), (person2.clone(), dec!(0.4)));
|
||||
shares.insert(person3.name().to_owned(), (person3.clone(), dec!(0.2)));
|
||||
shares.insert(person4.name().to_owned(), (person4.clone(), dec!(0.1)));
|
||||
let strategy = SplitStrategy::Shares(shares.clone());
|
||||
|
||||
split.split_strategy = strategy;
|
||||
assert!(split.split_strategy.validate(&split));
|
||||
assert!(split.validate());
|
||||
|
||||
let dues = split.split_strategy.money_owed(&split);
|
||||
let dues = split.money_owed();
|
||||
for (actor_name, (actor, due)) in dues.iter() {
|
||||
println!("Testing for actor: {actor_name} with due: {due}");
|
||||
if split.purchase.paid_by().name() == actor.name() {
|
||||
assert_eq!(*due, 0.00);
|
||||
assert_eq!(*due, dec!(0.00));
|
||||
} else {
|
||||
let (_, share) = shares.get(actor_name).unwrap();
|
||||
assert_eq!(*due, split.purchase.cost() * *share);
|
||||
|
|
@ -325,15 +300,24 @@ mod tests {
|
|||
|
||||
// Unequal split
|
||||
let mut shares = ShareHashMap::default();
|
||||
shares.insert(person1.name().to_owned(), (person1.clone(), 0.3 * split.purchase.cost()));
|
||||
shares.insert(person2.name().to_owned(), (person2.clone(), 0.4 * split.purchase.cost()));
|
||||
shares.insert(person3.name().to_owned(), (person3.clone(), 0.2 * split.purchase.cost()));
|
||||
shares.insert(person4.name().to_owned(), (person4.clone(), 0.1 * split.purchase.cost()));
|
||||
shares.insert(
|
||||
person1.name().to_owned(),
|
||||
(person1.clone(), dec!(0.3) * split.purchase.cost()),
|
||||
);
|
||||
shares.insert(
|
||||
person2.name().to_owned(),
|
||||
(person2.clone(), dec!(0.4) * split.purchase.cost()),
|
||||
);
|
||||
shares.insert(
|
||||
person3.name().to_owned(),
|
||||
(person3.clone(), dec!(0.2) * split.purchase.cost()),
|
||||
);
|
||||
shares.insert(
|
||||
person4.name().to_owned(),
|
||||
(person4.clone(), dec!(0.1) * split.purchase.cost()),
|
||||
);
|
||||
let strategy = SplitStrategy::Unequal(shares);
|
||||
split.split_strategy = strategy;
|
||||
assert!(split.split_strategy.validate(&split));
|
||||
|
||||
|
||||
assert!(split.validate());
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue