AbleScript
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ablescript
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Revert "Merge branch 'fix/unused-code'" 

This reverts commit 2faf90430e, reversing
changes made to 2b322c00cc.
pull/2/head
ondra05 2021-12-07 20:54:23 +01:00
parent 2faf90430e
commit 6dcaeaa5cc
7 changed files with 319 additions and 653 deletions
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83
ablescript/src/ast.rs
View File

@ -15,71 +15,26 @@ use crate::variables::Value;
type Span = std::ops::Range<usize>;
#[derive(Debug, Clone)]
pub struct Ident {
pub ident: String,
pub struct Iden {
pub iden: String,
pub span: Span,
}
impl Ident {
pub fn new(ident: String, span: Span) -> Self {
Self { ident, span }
impl Iden {
pub fn new(iden: String, span: Span) -> Self {
Self { iden, span }
}
}
impl PartialEq for Ident {
impl PartialEq for Iden {
fn eq(&self, other: &Self) -> bool {
self.ident == other.ident
self.iden == other.iden
}
}
impl Hash for Ident {
impl Hash for Iden {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.ident.hash(state)
}
}
#[derive(Debug, PartialEq, Clone, Hash)]
pub struct Assignable {
pub ident: Ident,
pub kind: AssignableKind,
}
#[derive(Debug, PartialEq, Clone, Hash)]
pub enum AssignableKind {
Variable,
Index { indices: Vec<Expr> },
}
impl Assignable {
pub fn from_expr(expr: Expr) -> Result<Assignable, ()> {
match expr.kind {
ExprKind::Variable(ident) => Ok(Assignable {
ident: Ident::new(ident, expr.span),
kind: AssignableKind::Variable,
}),
ExprKind::Index { expr, index } => Self::from_index(*expr, *index),
_ => Err(()),
}
}
fn from_index(mut buf: Expr, index: Expr) -> Result<Assignable, ()> {
let mut indices = vec![index];
let ident = loop {
match buf.kind {
ExprKind::Variable(ident) => break ident,
ExprKind::Index { expr, index } => {
indices.push(*index);
buf = *expr;
}
_ => return Err(()),
}
};
indices.reverse();
Ok(Assignable {
ident: Ident::new(ident, buf.span),
kind: AssignableKind::Index { indices },
})
self.iden.hash(state)
}
}
@ -121,21 +76,21 @@ pub enum StmtKind {
HopBack,
Var {
ident: Ident,
iden: Iden,
init: Option<Expr>,
},
Assign {
assignable: Assignable,
iden: Iden,
value: Expr,
},
Functio {
ident: Ident,
params: Vec<Ident>,
iden: Iden,
params: Vec<Iden>,
body: Block,
},
BfFunctio {
ident: Ident,
iden: Iden,
tape_len: Option<Expr>,
code: Vec<u8>,
},
@ -144,8 +99,8 @@ pub enum StmtKind {
args: Vec<Expr>,
},
Print(Expr),
Read(Assignable),
Melo(Ident),
Read(Iden),
Melo(Iden),
Rlyeh,
Rickroll,
}
@ -187,7 +142,7 @@ pub enum ExprKind {
Literal(Value),
Cart(Vec<(Expr, Expr)>),
Index {
expr: Box<Expr>,
cart: Box<Expr>,
index: Box<Expr>,
},
Variable(String),
@ -209,6 +164,8 @@ pub enum BinOpKind {
Less,
Equal,
NotEqual,
And,
Or,
}
impl BinOpKind {
@ -224,6 +181,8 @@ impl BinOpKind {
Token::LessThan => Ok(Self::Less),
Token::EqualEqual => Ok(Self::Equal),
Token::NotEqual => Ok(Self::NotEqual),
Token::And => Ok(Self::And),
Token::Or => Ok(Self::Or),
t => Err(crate::error::ErrorKind::UnexpectedToken(t)),
}
}

62
ablescript/src/base_55.rs
View File

@ -60,6 +60,68 @@ pub fn char2num(character: char) -> i32 {
_ => 0,
}
}
pub fn num2char(number: i32) -> char {
match number {
-26 => 'Z',
-25 => 'Y',
-24 => 'X',
-23 => 'W',
-22 => 'V',
-210 => 'U',
-20 => 'T',
-18 => 'R',
-19 => 'S',
-17 => 'Q',
-16 => 'P',
-15 => 'O',
-14 => 'N',
-13 => 'M',
-12 => 'L',
-11 => 'K',
-10 => 'J',
-9 => 'I',
-8 => 'H',
-7 => 'G',
-6 => 'F',
-5 => 'E',
-4 => 'D',
-3 => 'C',
-2 => 'B',
-1 => 'A',
0 => ' ',
1 => 'a',
2 => 'b',
3 => 'c',
4 => 'd',
5 => 'e',
6 => 'f',
7 => 'g',
8 => 'h',
9 => 'i',
10 => 'j',
11 => 'k',
12 => 'l',
13 => 'm',
14 => 'n',
15 => 'o',
16 => 'p',
17 => 'q',
18 => 'r',
19 => 's',
20 => 't',
21 => 'u',
22 => 'v',
23 => 'w',
24 => 'x',
25 => 'y',
26 => 'z',
// NOTE(Able): Why does it jump to 53 here? MY REASONS ARE BEYOND YOUR UNDERSTANDING MORTAL
53 => '/',
54 => '\\',
55 => '.',
_ => ' ',
}
}
#[cfg(test)]
mod tests {

3
ablescript/src/brian.rs
View File

@ -18,9 +18,6 @@
#![deny(missing_docs)]
// Putting this here because we still don't use the entire capabilities of this module. ~~Alex
#![allow(dead_code)]
use std::{
collections::VecDeque,
error::Error,

228
ablescript/src/interpret.rs
View File

@ -11,7 +11,6 @@ use std::{
cell::RefCell,
collections::{HashMap, VecDeque},
io::{stdin, stdout, Read, Write},
mem::take,
ops::Range,
process::exit,
rc::Rc,
@ -20,9 +19,9 @@ use std::{
use rand::random;
use crate::{
ast::{Assignable, AssignableKind, Expr, ExprKind, Ident, Stmt, StmtKind},
ast::{Expr, ExprKind, Iden, Stmt, StmtKind},
base_55,
consts::ablescript_consts,
consts::{self, ablescript_consts},
error::{Error, ErrorKind},
variables::{Functio, Value, Variable},
};
@ -135,23 +134,66 @@ impl ExecEnv {
fn eval_expr(&self, expr: &Expr) -> Result<Value, Error> {
use crate::ast::BinOpKind::*;
use crate::ast::ExprKind::*;
use Value::*;
Ok(match &expr.kind {
BinOp { lhs, rhs, kind } => {
let lhs = self.eval_expr(lhs)?;
let rhs = self.eval_expr(rhs)?;
match kind {
Add => lhs + rhs,
Subtract => lhs - rhs,
Multiply => lhs * rhs,
Divide => lhs / rhs,
Greater => Value::Bool(lhs > rhs),
Less => Value::Bool(lhs < rhs),
Equal => Value::Bool(lhs == rhs),
NotEqual => Value::Bool(lhs != rhs),
// Arithmetic operators.
Add | Subtract | Multiply | Divide => {
let lhs = lhs.to_i32();
let rhs = rhs.to_i32();
let res = match kind {
Add => lhs.checked_add(rhs),
Subtract => lhs.checked_sub(rhs),
Multiply => lhs.checked_mul(rhs),
Divide => lhs.checked_div(rhs),
_ => unreachable!(),
}
.unwrap_or(consts::ANSWER);
Int(res)
}
// Numeric comparisons.
Less | Greater => {
let lhs = lhs.to_i32();
let rhs = rhs.to_i32();
let res = match kind {
Less => lhs < rhs,
Greater => lhs > rhs,
_ => unreachable!(),
};
Bool(res)
}
// General comparisons.
Equal | NotEqual => {
let res = match kind {
Equal => lhs == rhs,
NotEqual => lhs != rhs,
_ => unreachable!(),
};
Bool(res)
}
// Logical connectives.
And | Or => {
let lhs = lhs.to_bool();
let rhs = rhs.to_bool();
let res = match kind {
And => lhs && rhs,
Or => lhs || rhs,
_ => unreachable!(),
};
Bool(res)
}
}
}
Not(expr) => !self.eval_expr(expr)?,
Not(expr) => Bool(!self.eval_expr(expr)?.to_bool()),
Literal(value) => value.clone(),
ExprKind::Cart(members) => Value::Cart(
members
@ -164,21 +206,18 @@ impl ExecEnv {
})
.collect::<Result<HashMap<_, _>, _>>()?,
),
Index { expr, index } => {
let value = self.eval_expr(expr)?;
Index { cart, index } => {
let cart = self.eval_expr(cart)?;
let index = self.eval_expr(index)?;
value
.into_cart()
.get(&index)
.map(|x| x.borrow().clone())
.unwrap_or(Value::Nul)
// TODO: this probably shouldn't be cloned
cart.index(&index).borrow().clone()
}
// TODO: not too happy with constructing an artificial
// Ident here.
Variable(name) => self.get_var(&Ident {
ident: name.to_owned(),
// Iden here.
Variable(name) => self.get_var(&Iden {
iden: name.to_owned(),
span: expr.span.clone(),
})?,
})
@ -190,52 +229,52 @@ impl ExecEnv {
StmtKind::Print(expr) => {
println!("{}", self.eval_expr(expr)?);
}
StmtKind::Var { ident, init } => {
StmtKind::Var { iden, init } => {
let init = match init {
Some(e) => self.eval_expr(e)?,
None => Value::Nul,
};
self.decl_var(&ident.ident, init);
self.decl_var(&iden.iden, init);
}
StmtKind::Functio {
ident,
params,
body,
} => {
StmtKind::Functio { iden, params, body } => {
self.decl_var(
&ident.ident,
&iden.iden,
Value::Functio(Functio::AbleFunctio {
params: params.iter().map(|ident| ident.ident.to_owned()).collect(),
params: params.iter().map(|iden| iden.iden.to_string()).collect(),
body: body.block.to_owned(),
}),
);
}
StmtKind::BfFunctio {
ident,
iden,
tape_len,
code,
} => {
self.decl_var(
&ident.ident,
&iden.iden,
Value::Functio(Functio::BfFunctio {
instructions: code.to_owned(),
tape_len: tape_len
.as_ref()
.map(|tape_len| self.eval_expr(tape_len).map(|v| v.into_i32() as usize))
.map(|tape_len| self.eval_expr(tape_len).map(|v| v.to_i32() as usize))
.unwrap_or(Ok(crate::brian::DEFAULT_TAPE_SIZE_LIMIT))?,
}),
);
}
StmtKind::If { cond, body } => {
if self.eval_expr(cond)?.into_bool() {
if self.eval_expr(cond)?.to_bool() {
return self.eval_stmts_hs(&body.block, true);
}
}
StmtKind::Call { expr, args } => {
let func = self.eval_expr(expr)?.into_functio();
let func = self.eval_expr(expr)?;
self.fn_call(func, args, &stmt.span)?;
if let Value::Functio(func) = func {
self.fn_call(func, args, &stmt.span)?;
} else {
// Fail silently for now.
}
}
StmtKind::Loop { body } => loop {
let res = self.eval_stmts_hs(&body.block, true)?;
@ -245,8 +284,9 @@ impl ExecEnv {
HaltStatus::Hopback(_) => continue,
}
},
StmtKind::Assign { assignable, value } => {
self.assign(assignable, self.eval_expr(value)?)?;
StmtKind::Assign { iden, value } => {
let value = self.eval_expr(value)?;
self.get_var_mut(iden)?.value.replace(value);
}
StmtKind::Break => {
return Ok(HaltStatus::Break(stmt.span.clone()));
@ -254,8 +294,8 @@ impl ExecEnv {
StmtKind::HopBack => {
return Ok(HaltStatus::Hopback(stmt.span.clone()));
}
StmtKind::Melo(ident) => {
self.get_var_mut(ident)?.melo = true;
StmtKind::Melo(iden) => {
self.get_var_mut(iden)?.melo = true;
}
StmtKind::Rlyeh => {
// Maybe print a creepy error message or something
@ -267,69 +307,20 @@ impl ExecEnv {
.write_all(include_str!("rickroll").as_bytes())
.expect("Failed to write to stdout");
}
StmtKind::Read(assignable) => {
StmtKind::Read(iden) => {
let mut value = 0;
for _ in 0..READ_BITS {
value <<= 1;
value += self.get_bit()? as i32;
}
self.assign(assignable, Value::Int(value))?;
self.get_var_mut(iden)?.value.replace(Value::Int(value));
}
}
Ok(HaltStatus::Finished)
}
/// Assign a value to an Assignable.
fn assign(&mut self, dest: &Assignable, value: Value) -> Result<(), Error> {
match dest.kind {
AssignableKind::Variable => {
self.get_var_mut(&dest.ident)?.value.replace(value);
}
AssignableKind::Index { ref indices } => {
let mut cell = self.get_var_rc(&dest.ident)?;
for index in indices {
let index = self.eval_expr(index)?;
let next_cell = match &mut *cell.borrow_mut() {
Value::Cart(c) => {
// cell is a cart, so we can do simple
// indexing.
if let Some(x) = c.get(&index) {
// cell[index] exists, get a shared
// reference to it.
Rc::clone(x)
} else {
// cell[index] does not exist, so we
// insert an empty cart by default
// instead.
let next_cell =
Rc::new(RefCell::new(Value::Cart(Default::default())));
c.insert(index, Rc::clone(&next_cell));
next_cell
}
}
x => {
// cell is not a cart; `take` it, convert
// it into a cart, and write the result
// back into it.
let mut cart = take(x).into_cart();
let next_cell = Rc::new(RefCell::new(Value::Cart(Default::default())));
cart.insert(index, Rc::clone(&next_cell));
*x = Value::Cart(cart);
next_cell
}
};
cell = next_cell;
}
cell.replace(value);
}
}
Ok(())
}
/// Call a function with the given arguments (i.e., actual
/// parameters). If the function invocation fails for some reason,
/// report the error at `span`.
@ -340,8 +331,8 @@ impl ExecEnv {
.iter()
.map(|arg| {
if let ExprKind::Variable(name) = &arg.kind {
self.get_var_rc(&Ident {
ident: name.to_owned(),
self.get_var_rc(&Iden {
iden: name.to_owned(),
span: arg.span.clone(),
})
} else {
@ -396,17 +387,6 @@ impl ExecEnv {
self.stack.pop();
res?;
}
Functio::Eval(code) => {
if !args.is_empty() {
return Err(Error {
kind: ErrorKind::MismatchedArgumentError,
span: span.to_owned(),
});
}
let stmts = crate::parser::Parser::new(&code).init()?;
self.eval_stmts(&stmts)?;
}
}
Ok(())
}
@ -433,9 +413,9 @@ impl ExecEnv {
/// Get the value of a variable. Throw an error if the variable is
/// inaccessible or banned.
fn get_var(&self, name: &Ident) -> Result<Value, Error> {
fn get_var(&self, name: &Iden) -> Result<Value, Error> {
// One-letter names are reserved as base55 numbers.
let mut chars = name.ident.chars();
let mut chars = name.iden.chars();
if let (Some(first), None) = (chars.next(), chars.next()) {
return Ok(Value::Int(base_55::char2num(first)));
}
@ -446,20 +426,20 @@ impl ExecEnv {
.stack
.iter()
.rev()
.find_map(|scope| scope.variables.get(&name.ident))
.find_map(|scope| scope.variables.get(&name.iden))
{
Some(var) => {
if !var.melo {
Ok(var.value.borrow().clone())
} else {
Err(Error {
kind: ErrorKind::MeloVariable(name.ident.to_owned()),
kind: ErrorKind::MeloVariable(name.iden.to_owned()),
span: name.span.clone(),
})
}
}
None => Err(Error {
kind: ErrorKind::UnknownVariable(name.ident.to_owned()),
kind: ErrorKind::UnknownVariable(name.iden.to_owned()),
span: name.span.clone(),
}),
}
@ -467,27 +447,27 @@ impl ExecEnv {
/// Get a mutable reference to a variable. Throw an error if the
/// variable is inaccessible or banned.
fn get_var_mut(&mut self, name: &Ident) -> Result<&mut Variable, Error> {
fn get_var_mut(&mut self, name: &Iden) -> Result<&mut Variable, Error> {
// This function has a lot of duplicated code with `get_var`,
// which I feel like is a bad sign...
match self
.stack
.iter_mut()
.rev()
.find_map(|scope| scope.variables.get_mut(&name.ident))
.find_map(|scope| scope.variables.get_mut(&name.iden))
{
Some(var) => {
if !var.melo {
Ok(var)
} else {
Err(Error {
kind: ErrorKind::MeloVariable(name.ident.to_owned()),
kind: ErrorKind::MeloVariable(name.iden.to_owned()),
span: name.span.clone(),
})
}
}
None => Err(Error {
kind: ErrorKind::UnknownVariable(name.ident.to_owned()),
kind: ErrorKind::UnknownVariable(name.iden.to_owned()),
span: name.span.clone(),
}),
}
@ -495,7 +475,7 @@ impl ExecEnv {
/// Get an Rc'd pointer to the value of a variable. Throw an error
/// if the variable is inaccessible or banned.
fn get_var_rc(&mut self, name: &Ident) -> Result<Rc<RefCell<Value>>, Error> {
fn get_var_rc(&mut self, name: &Iden) -> Result<Rc<RefCell<Value>>, Error> {
Ok(self.get_var_mut(name)?.value.clone())
}
@ -591,7 +571,7 @@ mod tests {
span: 1..1
})
.unwrap(),
Value::Int(-2147483648)
Value::Int(42)
);
// And the same for divide by zero.
@ -599,7 +579,7 @@ mod tests {
env.eval_expr(&Expr {
kind: ExprKind::BinOp {
lhs: Box::new(Expr {
kind: ExprKind::Literal(Value::Int(84)),
kind: ExprKind::Literal(Value::Int(1)),
span: 1..1,
}),
rhs: Box::new(Expr {
@ -611,7 +591,7 @@ mod tests {
span: 1..1
})
.unwrap(),
Value::Int(2)
Value::Int(42)
);
}
@ -637,8 +617,8 @@ mod tests {
// Declaring and reading from a variable.
eval(&mut env, "var foo = 32; var bar = foo + 1;").unwrap();
assert_eq!(
env.get_var(&Ident {
ident: "bar".to_owned(),
env.get_var(&Iden {
iden: "bar".to_owned(),
span: 1..1,
})
.unwrap(),
@ -648,8 +628,8 @@ mod tests {
// Assigning an existing variable.
eval(&mut env, "foo = \"hi\";").unwrap();
assert_eq!(
env.get_var(&Ident {
ident: "foo".to_owned(),
env.get_var(&Iden {
iden: "foo".to_owned(),
span: 1..1,
})
.unwrap(),
@ -674,8 +654,8 @@ mod tests {
.unwrap();
assert_eq!(
env.get_var(&Ident {
ident: "foo".to_owned(),
env.get_var(&Iden {
iden: "foo".to_owned(),
span: 1..1,
})
.unwrap(),

22
ablescript/src/lexer.rs
View File

@ -64,7 +64,13 @@ pub enum Token {
#[token("!=")]
NotEqual,
#[regex("!|aint")] // also add aint as a not keyword
#[token("&")]
And,
#[token("|")]
Or,
#[token("!|aint")] // also add aint as a not keyword
Not,
// Keywords
@ -117,7 +123,7 @@ pub enum Token {
// Literals
/// True, False
#[regex("true|false", get_value)]
#[regex("true|false", get_bool)]
Bool(bool),
/// Always, Sometimes, Never
@ -133,11 +139,11 @@ pub enum Token {
String(String),
/// Integer
#[regex(r"-?[0-9]+", get_value)]
#[regex(r"-?[0-9]+", get_int)]
Integer(i32),
/// A C-complaint identifier
#[regex(r"[a-zA-Z_][a-zA-Z_0-9]*", get_ident)]
#[regex(r"[a-zA-Z_][a-zA-Z_0-9]*", get_iden)]
Identifier(String),
#[regex(r"owo .*")]
@ -151,7 +157,11 @@ pub enum Token {
Error,
}
fn get_value<T: std::str::FromStr>(lexer: &mut Lexer<Token>) -> Option<T> {
fn get_bool(lexer: &mut Lexer<Token>) -> Option<bool> {
lexer.slice().parse().ok()
}
fn get_int(lexer: &mut Lexer<Token>) -> Option<i32> {
lexer.slice().parse().ok()
}
@ -168,7 +178,7 @@ fn get_abool(lexer: &mut Lexer<Token>) -> Option<Abool> {
}
}
fn get_ident(lexer: &mut Lexer<Token>) -> String {
fn get_iden(lexer: &mut Lexer<Token>) -> String {
lexer.slice().to_owned()
}

109
ablescript/src/parser.rs
View File

@ -76,19 +76,19 @@ impl<'source> Parser<'source> {
Token::Melo => Ok(Stmt::new(self.melo_flow()?, start..self.lexer.span().end)),
Token::Loop => Ok(Stmt::new(self.loop_flow()?, start..self.lexer.span().end)),
Token::Break => Ok(Stmt::new(
self.semicolon_terminated(StmtKind::Break)?,
self.semi_terminated(StmtKind::Break)?,
start..self.lexer.span().end,
)),
Token::HopBack => Ok(Stmt::new(
self.semicolon_terminated(StmtKind::HopBack)?,
self.semi_terminated(StmtKind::HopBack)?,
start..self.lexer.span().end,
)),
Token::Rlyeh => Ok(Stmt::new(
self.semicolon_terminated(StmtKind::Rlyeh)?,
self.semi_terminated(StmtKind::Rlyeh)?,
start..self.lexer.span().end,
)),
Token::Rickroll => Ok(Stmt::new(
self.semicolon_terminated(StmtKind::Rickroll)?,
self.semi_terminated(StmtKind::Rickroll)?,
start..self.lexer.span().end,
)),
@ -98,8 +98,6 @@ impl<'source> Parser<'source> {
| Token::Integer(_)
| Token::Abool(_)
| Token::Bool(_)
| Token::Nul
| Token::Not
| Token::LeftBracket
| Token::LeftParen => Ok(Stmt::new(
self.value_flow(token)?,
@ -116,7 +114,7 @@ impl<'source> Parser<'source> {
/// Require statement to be semicolon terminated
///
/// Utility function for short statements
fn semicolon_terminated(&mut self, stmt_kind: StmtKind) -> Result<StmtKind, Error> {
fn semi_terminated(&mut self, stmt_kind: StmtKind) -> Result<StmtKind, Error> {
self.require(Token::Semicolon)?;
Ok(stmt_kind)
}
@ -131,13 +129,13 @@ impl<'source> Parser<'source> {
}
/// Get an Identifier
fn get_ident(&mut self) -> Result<Ident, Error> {
fn get_iden(&mut self) -> Result<Iden, Error> {
match self.checked_next()? {
Token::Identifier(ident) => Ok(Ident {
ident: if self.tdark {
ident.replace("lang", "script")
Token::Identifier(iden) => Ok(Iden {
iden: if self.tdark {
iden.replace("lang", "script")
} else {
ident
iden
},
span: self.lexer.span(),
}),
@ -194,7 +192,7 @@ impl<'source> Parser<'source> {
Token::LeftBracket => match buf.take() {
Some(buf) => Ok(Expr::new(
ExprKind::Index {
expr: Box::new(buf),
cart: Box::new(buf),
index: Box::new(self.expr_flow(Token::RightBracket)?),
},
start..self.lexer.span().end,
@ -210,7 +208,9 @@ impl<'source> Parser<'source> {
| Token::EqualEqual
| Token::NotEqual
| Token::LessThan
| Token::GreaterThan => Ok(Expr::new(
| Token::GreaterThan
| Token::And
| Token::Or => Ok(Expr::new(
self.binop_flow(
BinOpKind::from_token(token).map_err(|e| Error::new(e, self.lexer.span()))?,
buf,
@ -340,7 +340,7 @@ impl<'source> Parser<'source> {
let stmt = StmtKind::Print(buf.take().ok_or_else(|| {
Error::new(ErrorKind::UnexpectedToken(Token::Print), self.lexer.span())
})?);
break self.semicolon_terminated(stmt)?;
break self.semi_terminated(stmt)?;
}
// Functio call
@ -355,29 +355,26 @@ impl<'source> Parser<'source> {
// Variable Assignment
Token::Equal => {
if let Some(Ok(assignable)) = buf.take().map(Assignable::from_expr) {
if let Some(Expr {
kind: ExprKind::Variable(iden),
span,
}) = buf
{
break StmtKind::Assign {
assignable,
iden: Iden::new(iden, span),
value: self.expr_flow(Token::Semicolon)?,
};
} else {
return Err(Error::new(
ErrorKind::UnexpectedToken(Token::Equal),
self.lexer.span(),
));
}
}
// Read input
Token::Read => {
if let Some(Ok(assignable)) = buf.take().map(Assignable::from_expr) {
self.require(Token::Semicolon)?;
break StmtKind::Read(assignable);
} else {
return Err(Error::new(
ErrorKind::UnexpectedToken(Token::Read),
self.lexer.span(),
));
if let Some(Expr {
kind: ExprKind::Variable(iden),
span,
}) = buf
{
break self.semi_terminated(StmtKind::Read(Iden::new(iden, span)))?;
}
}
@ -403,9 +400,9 @@ impl<'source> Parser<'source> {
/// Parse functio flow
///
/// functio $ident (a, b, c) { ... }
/// functio $iden (a, b, c) { ... }
fn functio_flow(&mut self) -> Result<StmtKind, Error> {
let ident = self.get_ident()?;
let iden = self.get_iden()?;
self.require(Token::LeftParen)?;
@ -414,7 +411,7 @@ impl<'source> Parser<'source> {
match self.checked_next()? {
Token::RightParen => break,
Token::Identifier(i) => {
params.push(Ident::new(i, self.lexer.span()));
params.push(Iden::new(i, self.lexer.span()));
// Require comma (next) or right paren (end) after identifier
match self.checked_next()? {
@ -434,18 +431,14 @@ impl<'source> Parser<'source> {
let body = self.get_block()?;
Ok(StmtKind::Functio {
ident,
params,
body,
})
Ok(StmtKind::Functio { iden, params, body })
}
/// Parse BF function declaration
///
/// `bff $ident ([tapelen]) { ... }`
/// `bff $iden ([tapelen]) { ... }`
fn bff_flow(&mut self) -> Result<StmtKind, Error> {
let ident = self.get_ident()?;
let iden = self.get_iden()?;
let tape_len = match self.checked_next()? {
Token::LeftParen => {
@ -479,7 +472,7 @@ impl<'source> Parser<'source> {
}
Ok(StmtKind::BfFunctio {
ident,
iden,
tape_len,
code,
})
@ -520,20 +513,20 @@ impl<'source> Parser<'source> {
/// Parse variable declaration
fn var_flow(&mut self) -> Result<StmtKind, Error> {
let ident = self.get_ident()?;
let iden = self.get_iden()?;
let init = match self.checked_next()? {
Token::Equal => Some(self.expr_flow(Token::Semicolon)?),
Token::Semicolon => None,
t => return Err(Error::new(ErrorKind::UnexpectedToken(t), self.lexer.span())),
};
Ok(StmtKind::Var { ident, init })
Ok(StmtKind::Var { iden, init })
}
/// Parse Melo flow
fn melo_flow(&mut self) -> Result<StmtKind, Error> {
let ident = self.get_ident()?;
self.semicolon_terminated(StmtKind::Melo(ident))
let iden = self.get_iden()?;
self.semi_terminated(StmtKind::Melo(iden))
}
/// Parse loop flow
@ -565,7 +558,7 @@ mod tests {
rhs: Box::new(Expr {
kind: ExprKind::BinOp {
lhs: Box::new(Expr {
kind: ExprKind::Variable("a".to_owned()),
kind: ExprKind::Variable("a".to_string()),
span: 5..6,
}),
rhs: Box::new(Expr {
@ -600,8 +593,8 @@ mod tests {
let code = r#"var a = 42;"#;
let expected = &[Stmt {
kind: StmtKind::Var {
ident: Ident {
ident: "a".to_owned(),
iden: Iden {
iden: "a".to_string(),
span: 4..5,
},
init: Some(Expr {
@ -638,7 +631,7 @@ mod tests {
body: Block {
block: vec![Stmt {
kind: StmtKind::Print(Expr {
kind: ExprKind::Literal(Value::Str("Buy Able products!".to_owned())),
kind: ExprKind::Literal(Value::Str("Buy Able products!".to_string())),
span: 19..39,
}),
span: 19..46,
@ -657,18 +650,18 @@ mod tests {
let code = r#"T-Dark { var lang = "lang" + lang; }"#;
let expected = &[Stmt {
kind: StmtKind::Var {
ident: Ident {
ident: "script".to_owned(),
iden: Iden {
iden: "script".to_string(),
span: 13..17,
},
init: Some(Expr {
kind: ExprKind::BinOp {
lhs: Box::new(Expr {
kind: ExprKind::Literal(Value::Str("script".to_owned())),
kind: ExprKind::Literal(Value::Str("script".to_string())),
span: 20..26,
}),
rhs: Box::new(Expr {
kind: ExprKind::Variable("script".to_owned()),
kind: ExprKind::Variable("script".to_string()),
span: 29..33,
}),
kind: BinOpKind::Add,
@ -691,7 +684,7 @@ mod tests {
kind: ExprKind::Cart(vec![
(
Expr {
kind: ExprKind::Literal(Value::Str("able".to_owned())),
kind: ExprKind::Literal(Value::Str("able".to_string())),
span: 1..7,
},
Expr {
@ -701,7 +694,7 @@ mod tests {
),
(
Expr {
kind: ExprKind::Literal(Value::Str("script".to_owned())),
kind: ExprKind::Literal(Value::Str("script".to_string())),
span: 14..22,
},
Expr {
@ -735,14 +728,14 @@ mod tests {
let expected = &[Stmt {
kind: StmtKind::Print(Expr {
kind: ExprKind::Index {
expr: Box::new(Expr {
cart: Box::new(Expr {
kind: ExprKind::Cart(vec![(
Expr {
kind: ExprKind::Literal(Value::Str("able".to_owned())),
kind: ExprKind::Literal(Value::Str("able".to_string())),
span: 1..7,
},
Expr {
kind: ExprKind::Literal(Value::Str("ablecorp".to_owned())),
kind: ExprKind::Literal(Value::Str("ablecorp".to_string())),
span: 11..21,
},
)]),

465
ablescript/src/variables.rs
View File

@ -1,13 +1,13 @@
use std::{
cell::RefCell, collections::HashMap, fmt::Display, hash::Hash, io::Write, mem::discriminant,
ops, rc::Rc, vec,
cell::RefCell, collections::HashMap, convert::TryFrom, fmt::Display, hash::Hash, io::Write,
mem::discriminant, rc::Rc,
};
use rand::Rng;
use crate::{ast::Stmt, consts};
#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Abool {
Never = -1,
Sometimes = 0,
@ -44,11 +44,8 @@ pub enum Functio {
params: Vec<String>,
body: Vec<Stmt>,
},
Eval(String),
}
pub type Cart = HashMap<Value, Rc<RefCell<Value>>>;
#[derive(Debug, Clone)]
pub enum Value {
Nul,
@ -57,13 +54,7 @@ pub enum Value {
Bool(bool),
Abool(Abool),
Functio(Functio),
Cart(Cart),
}
impl Default for Value {
fn default() -> Self {
Self::Nul
}
Cart(HashMap<Value, Rc<RefCell<Value>>>),
}
impl Hash for Value {
@ -81,6 +72,24 @@ impl Hash for Value {
}
}
impl PartialEq for Value {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Value::Nul, Value::Nul) => true,
(Value::Str(left), Value::Str(right)) => left == right,
(Value::Int(left), Value::Int(right)) => left == right,
(Value::Bool(left), Value::Bool(right)) => left == right,
(Value::Abool(left), Value::Abool(right)) => left == right,
(Value::Functio(left), Value::Functio(right)) => left == right,
(Value::Cart(_), Value::Cart(_)) => self.to_string() == other.to_string(),
(_, _) => false,
// TODO: do more coercions!
}
}
}
impl Eq for Value {}
impl Value {
/// Write an AbleScript value to a Brainfuck input stream by
/// coercing the value to an integer, then truncating that integer
@ -89,408 +98,73 @@ impl Value {
/// any IO errors will cause a panic.
pub fn bf_write(&self, stream: &mut impl Write) {
stream
.write_all(&[self.clone().into_i32() as u8])
.write_all(&[self.clone().to_i32() as u8])
.expect("Failed to write to Brainfuck input");
}
/// Coerce a value to an integer.
pub fn into_i32(self) -> i32 {
pub fn to_i32(&self) -> i32 {
match self {
Value::Abool(a) => a as _,
Value::Bool(b) => b as _,
Value::Abool(a) => *a as _,
Value::Bool(b) => *b as _,
Value::Functio(func) => match func {
// Compares lengths of functions:
// BfFunctio - Sum of lengths of instructions and length of tape
// AbleFunctio - Sum of argument count and body length
// Eval - Length of input code
Functio::BfFunctio {
instructions,
tape_len,
} => (instructions.len() + tape_len) as _,
Functio::AbleFunctio { params, body } => {
(params.len() + format!("{:?}", body).len()) as _
}
Functio::Eval(s) => s.len() as _,
Functio::AbleFunctio { params, body } => (params.len() + body.len()) as _,
},
Value::Int(i) => i,
Value::Int(i) => *i,
Value::Nul => consts::ANSWER,
Value::Str(text) => text.parse().unwrap_or(consts::ANSWER),
Value::Cart(c) => c.len() as _,
}
}
/// Coerce a value to a boolean.
pub fn into_bool(self) -> bool {
/// Coerce a Value to a boolean. The conversion cannot fail.
pub fn to_bool(&self) -> bool {
match self {
Value::Abool(b) => b.into(),
Value::Bool(b) => b,
Value::Abool(b) => (*b).into(),
Value::Bool(b) => *b,
Value::Functio(_) => true,
Value::Int(x) => x != 0,
Value::Nul => false,
Value::Str(s) => match s.to_lowercase().as_str() {
"false" | "no" | "🇳🇴" => false,
"true" | "yes" => true,
s => !s.is_empty(),
},
Value::Int(x) => *x != 0,
Value::Nul => true,
Value::Str(s) => !s.is_empty(),
Value::Cart(c) => !c.is_empty(),
}
}
/// Coerce a value to an aboolean.
pub fn into_abool(self) -> Abool {
match self {
Value::Nul => Abool::Never,
Value::Str(s) => match s.to_lowercase().as_str() {
"never" => Abool::Never,
"sometimes" => Abool::Sometimes,
"always" => Abool::Always,
s => {
if s.is_empty() {
Abool::Never
} else {
Abool::Always
}
}
},
Value::Int(x) => match x.cmp(&0) {
std::cmp::Ordering::Less => Abool::Never,
std::cmp::Ordering::Equal => Abool::Sometimes,
std::cmp::Ordering::Greater => Abool::Always,
},
Value::Bool(b) => {
if b {
Abool::Always
} else {
Abool::Never
}
}
Value::Abool(a) => a,
Value::Functio(_) => todo!(),
Value::Cart(c) => {
if c.is_empty() {
Abool::Never
} else {
Abool::Always
}
}
}
}
/// Coerce a value to a functio.
pub fn into_functio(self) -> Functio {
match self {
Value::Nul => Functio::AbleFunctio {
body: vec![],
params: vec![],
},
Value::Str(s) => Functio::Eval(s),
Value::Int(_) => todo!(),
Value::Bool(_) => todo!(),
Value::Abool(_) => todo!(),
Value::Functio(f) => f,
Value::Cart(_) => todo!(),
}
}
/// Coerce a value into a cart.
pub fn into_cart(self) -> Cart {
match self {
Value::Nul => HashMap::new(),
Value::Str(s) => s
.chars()
.enumerate()
.map(|(i, x)| {
(
Value::Int(i as i32 + 1),
Rc::new(RefCell::new(Value::Str(x.to_string()))),
)
})
.collect(),
Value::Int(i) => Value::Str(i.to_string()).into_cart(),
Value::Bool(b) => Value::Str(b.to_string()).into_cart(),
Value::Abool(a) => Value::Str(a.to_string()).into_cart(),
Value::Functio(f) => match f {
Functio::AbleFunctio { params, body } => {
let params: Cart = params
.into_iter()
.enumerate()
.map(|(i, x)| {
(
Value::Int(i as i32 + 1),
Rc::new(RefCell::new(Value::Str(x))),
)
})
.collect();
let body: Cart = body
.into_iter()
.enumerate()
.map(|(i, x)| {
(
Value::Int(i as i32 + 1),
Rc::new(RefCell::new(Value::Str(format!("{:?}", x)))),
)
})
.collect();
let mut cart = HashMap::new();
cart.insert(
Value::Str("params".to_owned()),
Rc::new(RefCell::new(Value::Cart(params))),
);
cart.insert(
Value::Str("body".to_owned()),
Rc::new(RefCell::new(Value::Cart(body))),
);
cart
}
Functio::BfFunctio {
instructions,
tape_len,
} => {
let mut cart: Cart = instructions
.into_iter()
.enumerate()
.map(|(i, x)| {
(
Value::Int(i as i32 + 1),
Rc::new(RefCell::new(
char::from_u32(x as u32)
.map(|x| Value::Str(x.to_string()))
.unwrap_or(Value::Nul),
)),
)
})
.collect();
cart.insert(
Value::Str("tapelen".to_owned()),
Rc::new(RefCell::new(Value::Int(tape_len as _))),
);
cart
}
Functio::Eval(s) => Value::Str(s).into_cart(),
},
Value::Cart(c) => c,
}
}
}
impl ops::Add for Value {
type Output = Value;
fn add(self, rhs: Self) -> Self::Output {
match self {
Value::Nul => match rhs {
Value::Nul => Value::Nul,
Value::Str(_) => Value::Str(self.to_string()) + rhs,
Value::Int(_) => Value::Int(self.into_i32()) + rhs,
Value::Bool(_) => Value::Bool(self.into_bool()) + rhs,
Value::Abool(_) => Value::Abool(self.into_abool()) + rhs,
Value::Functio(_) => Value::Functio(self.into_functio()) + rhs,
Value::Cart(_) => Value::Cart(self.into_cart()) + rhs,
},
Value::Str(s) => Value::Str(format!("{}{}", s, rhs.to_string())),
Value::Int(i) => Value::Int(i.wrapping_add(rhs.into_i32())),
Value::Bool(b) => Value::Bool(b || rhs.into_bool()),
Value::Abool(_) => {
Value::Abool(Value::Int(self.into_i32().max(rhs.into_i32())).into_abool())
}
Value::Functio(_) => todo!(),
Value::Cart(c) => {
Value::Cart(c.into_iter().chain(rhs.into_cart().into_iter()).collect())
}
}
}
}
impl ops::Sub for Value {
type Output = Value;
fn sub(self, rhs: Self) -> Self::Output {
match self {
Value::Nul => match rhs {
Value::Nul => Value::Nul,
Value::Str(_) => Value::Str(self.to_string()) - rhs,
Value::Int(_) => Value::Int(self.into_i32()) - rhs,
Value::Bool(_) => Value::Bool(self.into_bool()) - rhs,
Value::Abool(_) => Value::Abool(self.into_abool()) - rhs,
Value::Functio(_) => Value::Functio(self.into_functio()) - rhs,
Value::Cart(_) => Value::Cart(self.into_cart()) - rhs,
},
Value::Str(s) => Value::Str(s.replace(&rhs.to_string(), "")),
Value::Int(i) => Value::Int(i.wrapping_sub(rhs.into_i32())),
Value::Bool(b) => Value::Bool(b ^ rhs.into_bool()),
Value::Abool(_) => (self.clone() + rhs.clone()) * !(self * rhs),
Value::Functio(_) => todo!(),
Value::Cart(c) => Value::Cart({
let rhs_cart = rhs.into_cart();
c.into_iter()
.filter(|(k, v)| rhs_cart.get(k) != Some(v))
.collect()
}),
}
}
}
impl ops::Mul for Value {
type Output = Value;
fn mul(self, rhs: Self) -> Self::Output {
match self {
Value::Nul => match rhs {
Value::Nul => Value::Nul,
Value::Str(_) => Value::Str(self.to_string()) * rhs,
Value::Int(_) => Value::Int(self.into_i32()) * rhs,
Value::Bool(_) => Value::Bool(self.into_bool()) * rhs,
Value::Abool(_) => Value::Abool(self.into_abool()) * rhs,
Value::Functio(_) => Value::Functio(self.into_functio()) * rhs,
Value::Cart(_) => Value::Cart(self.into_cart()) * rhs,
},
Value::Str(s) => Value::Str(s.repeat(rhs.into_i32() as usize)),
Value::Int(i) => Value::Int(i.wrapping_mul(rhs.into_i32())),
Value::Bool(b) => Value::Bool(b && rhs.into_bool()),
Value::Abool(_) => {
Value::Abool(Value::Int(self.into_i32().min(rhs.into_i32())).into_abool())
}
Value::Functio(_) => todo!(),
Value::Cart(c) => {
let rhsc = rhs.into_cart();
Value::Cart(
c.into_iter()
.map(|(k, v)| {
if let Some(k) = rhsc.get(&k) {
(k.borrow().clone(), v)
} else {
(k, v)
}
})
.collect(),
)
}
}
}
}
impl ops::Div for Value {
type Output = Value;
fn div(self, rhs: Self) -> Self::Output {
match self {
Value::Nul => match rhs {
Value::Nul => Value::Nul,
Value::Str(_) => Value::Str(self.to_string()) / rhs,
Value::Int(_) => Value::Int(self.into_i32()) / rhs,
Value::Bool(_) => Value::Bool(self.into_bool()) / rhs,
Value::Abool(_) => Value::Abool(self.into_abool()) / rhs,
Value::Functio(_) => Value::Functio(self.into_functio()) / rhs,
Value::Cart(_) => Value::Cart(self.into_cart()) / rhs,
},
Value::Str(s) => Value::Cart(
s.split(&rhs.to_string())
.enumerate()
.map(|(i, x)| {
(
Value::Int(i as i32 + 1),
Rc::new(RefCell::new(Value::Str(x.to_owned()))),
)
})
.collect(),
),
Value::Int(i) => Value::Int(i.wrapping_div(match rhs.into_i32() {
0 => consts::ANSWER,
x => x,
})),
Value::Bool(b) => Value::Bool(!b || rhs.into_bool()),
Value::Abool(_) => !self + rhs,
Value::Functio(_) => todo!(),
Value::Cart(c) => {
let cart_len = c.len();
let chunk_len = rhs.into_i32() as usize;
Value::Cart(
c.into_iter()
.collect::<Vec<_>>()
.chunks(cart_len / chunk_len + (cart_len % chunk_len != 0) as usize)
.enumerate()
.map(|(k, v)| {
(
Value::Int(k as i32 + 1),
Rc::new(RefCell::new(Value::Cart(v.iter().cloned().collect()))),
)
})
.collect(),
)
}
}
}
}
impl ops::Not for Value {
type Output = Value;
fn not(self) -> Self::Output {
match self {
/// Index a value with another value, as in the "a[b]" syntax.
pub fn index(&self, index: &Value) -> Rc<RefCell<Value>> {
Rc::new(RefCell::new(match self {
Value::Nul => Value::Nul,
Value::Str(s) => Value::Str(s.chars().rev().collect()),
Value::Int(i) => Value::Int(i.swap_bytes()),
Value::Bool(b) => Value::Bool(!b),
Value::Abool(a) => Value::Abool(match a {
Abool::Never => Abool::Always,
Abool::Sometimes => Abool::Sometimes,
Abool::Always => Abool::Never,
}),
Value::Functio(_) => todo!(),
Value::Cart(c) => Value::Cart(
c.into_iter()
.map(|(k, v)| (v.borrow().clone(), Rc::new(RefCell::new(k))))
.collect(),
Value::Str(s) => Value::Int(
usize::try_from(index.to_i32() - 1)
.ok()
.and_then(|idx| s.as_bytes().get(idx).cloned())
.map(|value| value as i32)
.unwrap_or(0),
),
}
}
}
impl PartialEq for Value {
fn eq(&self, other: &Self) -> bool {
let other = other.clone();
match self {
Value::Nul => matches!(other, Value::Nul),
Value::Str(s) => *s == other.to_string(),
Value::Int(i) => *i == other.into_i32(),
Value::Bool(b) => *b == other.into_bool(),
Value::Abool(a) => *a == other.into_abool(),
Value::Functio(f) => *f == other.into_functio(),
Value::Cart(c) => *c == other.into_cart(),
}
}
}
impl Eq for Value {}
impl PartialOrd for Value {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
use std::cmp::Ordering::*;
let other = other.clone();
match self {
Value::Nul => {
if other == Value::Nul {
Some(Equal)
} else {
None
}
Value::Int(i) => Value::Int(
usize::try_from(index.to_i32() - 1)
.ok()
.and_then(|idx| format!("{}", i).as_bytes().get(idx).cloned())
.map(|value| value as i32)
.unwrap_or(0),
),
Value::Bool(b) => Value::Int(
usize::try_from(index.to_i32() - 1)
.ok()
.and_then(|idx| format!("{}", b).as_bytes().get(idx).cloned())
.map(|value| value as i32)
.unwrap_or(0),
),
Value::Abool(b) => Value::Int(*b as i32),
Value::Functio(_) => Value::Int(42),
Value::Cart(c) => {
return (c.get(index).cloned()).unwrap_or_else(|| Rc::new(RefCell::new(Value::Nul)))
}
Value::Str(s) => Some(s.cmp(&other.to_string())),
Value::Int(i) => Some(i.cmp(&other.into_i32())),
Value::Bool(b) => Some(b.cmp(&other.into_bool())),
Value::Abool(a) => a.partial_cmp(&other.into_abool()),
Value::Functio(_) => self.clone().into_i32().partial_cmp(&other.into_i32()),
Value::Cart(c) => Some(c.len().cmp(&other.into_cart().len())),
}
}))
}
}
@ -525,21 +199,12 @@ impl Display for Value {
body,
)
}
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 { "" },
value.borrow(),
key
)?;
for (key, value) in c {
write!(f, "{} <= {},", value.borrow(), key)?;
}
write!(f, "]")