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pub mod functio;
mod coercions;
mod ops;
pub use functio::Functio;
use std::{
cell::{Ref, RefCell, RefMut},
collections::HashMap,
fmt::Display,
hash::Hash,
io::Write,
mem::discriminant,
rc::Rc,
};
pub type Cart = HashMap<Value, ValueRef>;
#[derive(Debug, Default, Clone)]
pub enum Value {
#[default]
Nul,
Undefined,
Str(String),
Int(isize),
Abool(Abool),
Functio(Functio),
Cart(Cart),
}
impl Hash for Value {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
discriminant(self).hash(state);
match self {
Value::Nul | Value::Undefined => (),
Value::Str(v) => v.hash(state),
Value::Int(v) => v.hash(state),
Value::Abool(v) => v.to_string().hash(state),
Value::Functio(statements) => statements.hash(state),
Value::Cart(_) => self.to_string().hash(state),
}
}
}
impl Value {
pub fn bf_write(&self, stream: &mut impl Write) {
stream
.write_all(&[self.clone().into_isize() as u8])
.expect("Failed to write to Brainfuck input");
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd)]
pub enum Abool {
Never = -1,
Sometimes = 0,
Always = 1,
}
impl Abool {
pub fn to_bool(&self) -> bool {
match self {
Self::Always => true,
Self::Sometimes if rand::random() => true,
_ => false,
}
}
}
impl Display for Abool {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Abool::Never => write!(f, "never"),
Abool::Sometimes => write!(f, "sometimes"),
Abool::Always => write!(f, "always"),
}
}
}
impl From<bool> for Abool {
fn from(b: bool) -> Self {
if b {
Abool::Always
} else {
Abool::Never
}
}
}
impl Display for Value {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Value::Nul => write!(f, "nul"),
Value::Undefined => write!(f, "undefined"),
Value::Str(v) => write!(f, "{}", v),
Value::Int(v) => write!(f, "{}", v),
Value::Abool(v) => write!(f, "{}", v),
Value::Functio(v) => match v {
Functio::Bf {
instructions,
tape_len,
} => {
write!(
f,
"({}) {}",
tape_len,
String::from_utf8(instructions.to_owned())
.expect("Brainfuck functio source should be UTF-8")
)
}
Functio::Able { params, body } => {
write!(
f,
"({}) -> {:?}",
params.join(", "),
body,
)
}
Functio::Builtin(b) => write!(f, "builtin @ {}", b.fn_addr()),
Functio::Chain { functios, kind } => {
let (a, b) = *functios.clone();
write!(
f,
"{} {} {} ",
Value::Functio(a),
match kind {
functio::FunctioChainKind::Equal => '+',
functio::FunctioChainKind::ByArity => '*',
},
Value::Functio(b)
)
}
Functio::Eval(s) => write!(f, "{}", s),
},
Value::Cart(c) => {
write!(f, "[")?;
let mut cart_vec = c.iter().collect::<Vec<_>>();
cart_vec.sort_by(|x, y| x.0.partial_cmp(y.0).unwrap_or(std::cmp::Ordering::Less));
for (idx, (key, value)) in cart_vec.into_iter().enumerate() {
write!(f, "{}", if idx != 0 { ", " } else { "" },)?;
match &*value.borrow() {
x if std::ptr::eq(x, self) => write!(f, "<cycle>"),
x => write!(f, "{x}"),
}?;
write!(f, " <= {key}")?;
}
write!(f, "]")
}
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ValueRef(Rc<RefCell<Value>>);
impl ValueRef {
pub fn new(v: Value) -> Self {
Self(Rc::new(RefCell::new(v)))
}
pub fn borrow(&self) -> Ref<Value> {
self.0.borrow()
}
pub fn borrow_mut(&self) -> RefMut<Value> {
self.0.borrow_mut()
}
pub fn replace(&self, v: Value) -> Value {
self.0.replace(v)
}
}
#[derive(Debug)]
pub enum Variable {
Ref(ValueRef),
Melo,
}
impl Variable {
pub fn from_value(value: Value) -> Self {
Self::Ref(ValueRef::new(value))
}
}