Speed sketch beginnings of a Rust implementation of new stripped-down Scheme-like Kraken

This commit is contained in:
2023-02-07 02:07:53 -05:00
parent 3807381ceb
commit 60dad101f8
7 changed files with 715 additions and 0 deletions

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kr/Cargo.toml Normal file
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[package]
name = "kr"
version = "0.1.0"
edition = "2021"
build = "build.rs"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
lalrpop-util = {version="0.19.7", features=["lexer"]}
regex = "1"
[build-dependencies]
lalrpop = "0.19.7"

5
kr/build.rs Normal file
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extern crate lalrpop;
fn main() {
lalrpop::process_root().unwrap();
}

37
kr/src/ast.rs Normal file
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use std::rc::Rc;
#[derive(Debug)]
pub enum Form {
Int(i32),
Symbol(String),
Pair(Rc<Form>,Rc<Form>),
PrimComb(String, fn(Rc<Form>, Rc<Form>) -> Rc<Form>),
Nil,
}
impl Form {
pub fn int(&self) -> Option<i32> {
match self {
Form::Int(i) => Some(*i),
_ => None,
}
}
pub fn sym(&self) -> Option<&str> {
match self {
Form::Symbol(s) => Some(s),
_ => None,
}
}
pub fn car(&self) -> Option<Rc<Form>> {
match self {
Form::Pair(car, cdr) => Some(Rc::clone(car)),
_ => None,
}
}
pub fn cdr(&self) -> Option<Rc<Form>> {
match self {
Form::Pair(car, cdr) => Some(Rc::clone(cdr)),
_ => None,
}
}
}

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kr/src/grammar.lalrpop Normal file
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use std::str::FromStr;
use std::rc::Rc;
use crate::ast::Form;
grammar;
pub Term: Form = {
NUM => Form::Int(i32::from_str(<>).unwrap()),
SYM => Form::Symbol(<>.to_owned()),
"(" <ListInside?> ")" => <>.unwrap_or(Form::Nil),
"'" <Term> => Form::Pair(Rc::new(Form::Symbol("quote".to_owned())), Rc::new(<>)),
};
ListInside: Form = {
<Term> => Form::Pair(Rc::new(<>), Rc::new(Form::Nil)),
<h: Term> <t: ListInside> => Form::Pair(Rc::new(h), Rc::new(t)),
<a: Term> "." <d: Term> => Form::Pair(Rc::new(a), Rc::new(d)),
}
match {
"(",
")",
".",
"'",
r"[0-9]+" => NUM,
r"[a-zA-Z+*/_-][\w+*/_-]*" => SYM,
r"(;[^\n]*\n)|\s+" => { }
}

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#[macro_use] extern crate lalrpop_util;
lalrpop_mod!(pub grammar);
use std::rc::Rc;
mod ast;
use crate::ast::Form;
#[test]
fn parse_test() {
assert!(grammar::TermParser::new().parse("22").is_ok());
assert!(grammar::TermParser::new().parse("(22)").is_ok());
assert!(grammar::TermParser::new().parse("(((22)))").is_ok());
assert!(grammar::TermParser::new().parse("((22)").is_err());
assert!(grammar::TermParser::new().parse("22").is_ok());
assert!(grammar::TermParser::new().parse("(22)").is_ok());
assert!(grammar::TermParser::new().parse("(22 )").is_ok());
assert!(grammar::TermParser::new().parse("()").is_ok());
assert!(grammar::TermParser::new().parse("( )").is_ok());
assert!(grammar::TermParser::new().parse("( 44)").is_ok());
assert!(grammar::TermParser::new().parse("(44 )").is_ok());
assert!(grammar::TermParser::new().parse("(22 44 (1) 33 (4 5 (6) 6))").is_ok());
assert!(grammar::TermParser::new().parse("hello").is_ok());
assert!(grammar::TermParser::new().parse("-").is_ok());
assert!(grammar::TermParser::new().parse("+").is_ok());
assert!(grammar::TermParser::new().parse("(+ 1 ;hi
3)").is_ok());
assert!(grammar::TermParser::new().parse("'13").is_ok());
assert!(grammar::TermParser::new().parse("hello-world").is_ok());
assert!(grammar::TermParser::new().parse("_").is_ok());
}
fn eval(e: Rc<Form>, f: Rc<Form>) -> Rc<Form> {
let mut e = e;
let mut x = Option::Some(f);
loop {
let cur = x.take().unwrap();
match *cur {
Form::Symbol(ref s) => {
let mut t = e;
while s != t.car().unwrap().car().unwrap().sym().unwrap() {
t = t.cdr().unwrap();
}
return t.car().unwrap().cdr().unwrap();
},
Form::Pair(ref c, ref p) => {
let comb = eval(Rc::clone(&e), Rc::clone(c));
match *comb {
Form::PrimComb(ref n, ref f) => return f(e, Rc::clone(p)),
_ => panic!("Tried to call not a PrimComb {:?}", comb),
}
},
_ => return cur,
}
}
}
fn main() {
fn assoc(kvs: Vec<(&str, Rc<Form>)>) -> Rc<Form> {
let mut to_ret = Rc::new(Form::Nil);
for (k, v) in kvs {
to_ret = Rc::new(Form::Pair(
Rc::new(Form::Pair(
Rc::new(Form::Symbol(k.to_owned())),
v)),
to_ret));
}
to_ret
}
let env = assoc(vec![
("+", Rc::new(Form::PrimComb("+".to_owned(), |e, p| {
Rc::new(Form::Int(p.car().unwrap().int().unwrap() + p.cdr().unwrap().car().unwrap().int().unwrap()))
})))
]);
let input = "(+ 2 2)";
let result = eval(env, Rc::new(grammar::TermParser::new().parse(input).unwrap()));
println!("Result is {:?}", result);
}