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//This module defines the domain specific language.
use std::{rc::Rc, borrow::Cow};
use higher_free_macro::free;
use std::convert::identity;
use higher::Functor;
#[derive(Clone)]
pub enum Speaker{
Partner,
DeliLady,
Cashier,
}
#[derive(Clone)]
pub enum Mood{
Friendly,
Confused,
Happy,
Amused,
Annoyed,
Apologetic,
}
#[derive(Clone, Copy, PartialEq, Eq)]
pub enum Location{
Entrance,
Deli,
Checkout,
Refrigerators,
Shelves,
}
#[derive(Clone)]
pub enum SausageRoll<'a, 's,A>{
SayDialogueLine{
speaker: Speaker,
text : Cow<'s, str>, //In a real project I would just make this a String. Here it's a reference to show off lifetime support.
mood : Mood,
next : A
},
GivePlayerOptions{
options : Vec<&'s str>,
next : Rc<dyn Fn(usize)-> A + 'a> //let's just assume that the interpreter validates input.
},
PresentLocation{
location : Location,
next : A,
},
Exposition{
text : &'s str,
next : A,
}
}
#[derive(Copy,Clone,PartialEq,Eq)]
pub enum Item{
//refrigerators
Milk,
Yoghurt,
Cheese,
//shelves
Pickles,
CatFood,
Beer,
ToiletPaper,
//deli
SausageRoll,
FishSandwich,
//cashier
ChewingGum,
Shots,
Pulp,
}
impl Item {
fn price(self) -> usize {
match self {
Item::SausageRoll => 300,
Item::Pickles => 250,
Item::Milk => 125,
Item::Yoghurt => 125,
Item::Cheese => 750,
Item::CatFood => 2500,
Item::Beer => 125,
Item::ToiletPaper => 500,
Item::FishSandwich => 300,
Item::ChewingGum => 100,
Item::Shots => 300,
Item::Pulp => 250,
}
}
pub fn description(self) -> &'static str {
match self {
Item::SausageRoll => "A sausage roll, costing €3.00.",
Item::Pickles => "A glass of pickles, costing €2.50",
Item::Milk => "A bottle of milk, costing €1.25",
Item::Yoghurt => "A cup of yoghurt, costing €1.25",
Item::Cheese => "A block of expensive grey cheese, costing €7.50",
Item::CatFood => "A bag of cat food, costing €25.00",
Item::Beer => "A bottle of beer, for €1.25",
Item::ToiletPaper => "A package of toilet paper, costing €5.00",
Item::FishSandwich => "A fish sandwich, emitting a tasty smell, costing €3.00",
Item::ChewingGum => "A pack of chewing gum, costing €1.00",
Item::Shots => "A shot of a sad excuse for whisky, costing €3.00",
Item::Pulp => "A pulp novel called \"Aliens ate my trashbin\", which should not cost the €2.50 it does",
}
}
}
impl Location{
pub fn items(self) -> Vec<Item> {
match self {
Location::Entrance => Vec::default(),
Location::Deli => vec![], //must talk to deli lady to get the sausage roll. This also means it cannot be returned.
Location::Checkout => vec![Item::ChewingGum, Item::Shots, Item::Pulp],
Location::Refrigerators => vec![Item::Milk, Item::Yoghurt, Item::Cheese],
Location::Shelves => vec![Item::Pickles, Item::CatFood, Item::Beer, Item::ToiletPaper],
}
}
}
//In a real project I would probably aim to make this Copy as well, especially if it's as small as this.
//I left it as Clone intentionally, to illustrate how one can work around the limitation of it not being Copy.
#[derive(Clone)]
pub struct Inventory {
pub items : Vec<Item>,
}
impl Default for Inventory{
fn default() -> Self {
Self { items: Default::default() }
}
}
impl Inventory{
pub fn has_item_from_room(&self, room : Location) -> bool {
let items_from_room = room.items();
self.items.iter().any(|i| items_from_room.contains(i))
}
pub fn try_add(self, item : Item) -> Result<Self, Self>{
if self.items.len() < 3 {
let mut items = self.items;
items.push(item); //am I the only one that hates that push doesn't return the updated vec?
Ok(Inventory{items, ..self})
} else {
Err(self)
}
}
pub fn try_remove(mut self, item : Item) -> Result<Self, Self>{
let idx = self.items.iter().position(|i| *i == item);
match idx {
Some(idx) => {
self.items.swap_remove(idx);
Ok(self)
},
None => Err(self),
}
}
pub fn get_money() -> &'static str{
"€10.00" //It doesn't change. Can as well be a constant.
}
pub fn total_price(&self) -> usize {
self.items.iter().cloned().map(Item::price).sum::<usize>()
}
pub fn can_afford(&self) -> bool {
self.total_price() <= 1000_usize
}
}
impl<'a,'s, A : 'a> Functor<'a,A> for SausageRoll<'a,'s,A>{
type Target<T> = SausageRoll<'a,'s,T>;
fn fmap<B, F>(self, f: F) -> Self::Target<B>
where
F: Fn(A) -> B + 'a {
match self {
SausageRoll::SayDialogueLine { speaker, text, mood, next } => SausageRoll::SayDialogueLine { speaker, text, mood, next: f(next) },
SausageRoll::GivePlayerOptions { options, next } => SausageRoll::GivePlayerOptions { options, next: Rc::new(move |x| f(next(x))) },
SausageRoll::PresentLocation { location, next } => SausageRoll::PresentLocation { location, next: f(next) },
SausageRoll::Exposition { text, next } => SausageRoll::Exposition { text, next: f(next) },
}
}
}
free!(<'a>, pub FreeSausageRoll<'a,'s,A>, SausageRoll<'a, 's, FreeSausageRoll<'a,'s,A>>);
pub fn say_dialogue_line<'a,'s:'a>(speaker : Speaker, text : Cow<'s,str>, mood : Mood) -> FreeSausageRoll<'a, 's, ()>{
FreeSausageRoll::lift_f(SausageRoll::SayDialogueLine { speaker, text, mood, next: () })
}
pub fn give_player_options<'a,'s:'a>(options : Vec<&'s str>) -> FreeSausageRoll<'a,'s, usize>{
FreeSausageRoll::lift_f(SausageRoll::GivePlayerOptions { options, next: Rc::new(identity) })
}
pub fn present_location<'a, 's:'a>(location : Location) -> FreeSausageRoll<'a,'s, ()>{
FreeSausageRoll::lift_f(SausageRoll::PresentLocation { location, next: () })
}
pub fn exposition<'a,'s:'a>(text : &'s str) -> FreeSausageRoll<'a,'s,()>{
FreeSausageRoll::lift_f(SausageRoll::Exposition { text, next: () })
}
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