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Move entire Form out of eval into Trait

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This commit is contained in:
Nathan Braswell
2023-07-04 10:16:38 -04:00
parent d6cf6a6b64
commit b03122c7b8
2 changed files with 216 additions and 166 deletions
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360
kv/src/ast.rs
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@@ -15,51 +15,194 @@ impl<A: Into<Form>, B: Into<Form>> From<(A, B)> for Form {
}
}
impl Form {
pub fn truthy(&self) -> bool {
pub trait FormT: std::fmt::Debug {
fn nil() -> Rc<Self>;
fn truthy(&self) -> bool;
fn int(&self) -> Option<i32>;
fn sym(&self) -> Option<&str>;
fn pair(&self) -> Option<(Rc<Self>,Rc<Self>)>;
fn car(&self) -> Option<Rc<Self>>;
fn cdr(&self) -> Option<Rc<Self>>;
fn prim_comb(&self) -> Option<(i32, PrimCombI)>;
fn deri_comb(&self) -> Option<(Rc<Self>, Option<String>, String, Rc<Self>)>;
fn cont_comb(&self) -> Option<Cont<Self>>;
fn is_nil(&self) -> bool;
fn append(&self, x: Rc<Self>) -> Option<Rc<Self>>;
fn assoc(k: &str, v: Rc<Self>, l: Rc<Self>) -> Rc<Self>;
fn impl_prim(ins: PrimCombI, e: Rc<Self>, ps: Rc<Self>, c: Cont<Self>, metac: Cont<Self>) -> Cursor<Self>;
}
impl FormT for Form {
fn prim_comb(&self) -> Option<(i32, PrimCombI)> {
match self {
Form::PrimComb{ eval_limit, ins } => Some((*eval_limit,*ins)),
_ => None,
}
}
fn deri_comb(&self) -> Option<(Rc<Self>, Option<String>, String, Rc<Self>)> {
match self {
Form::DeriComb{ se, de, params, body } => Some((Rc::clone(se), de.clone(), params.clone(), Rc::clone(body))),
_ => None,
}
}
fn cont_comb(&self) -> Option<Cont<Self>> {
match self {
Form::ContComb(c) => Some(c.clone()),
_ => None,
}
}
fn nil() -> Rc<Self> {
Rc::new(Form::Nil)
}
fn truthy(&self) -> bool {
match self {
Form::Bool(b) => *b,
Form::Nil => false,
_ => true,
}
}
pub fn int(&self) -> Option<i32> {
fn int(&self) -> Option<i32> {
match self {
Form::Int(i) => Some(*i),
_ => None,
}
}
pub fn sym(&self) -> Option<&str> {
fn sym(&self) -> Option<&str> {
match self {
Form::Symbol(s) => Some(s),
_ => None,
}
}
pub fn car(&self) -> Option<Rc<Form>> {
fn pair(&self) -> Option<(Rc<Form>,Rc<Form>)> {
match self {
Form::Pair(car, cdr) => Some((Rc::clone(car),Rc::clone(cdr))),
_ => None,
}
}
fn car(&self) -> Option<Rc<Form>> {
match self {
Form::Pair(car, _cdr) => Some(Rc::clone(car)),
_ => None,
}
}
pub fn cdr(&self) -> Option<Rc<Form>> {
fn cdr(&self) -> Option<Rc<Form>> {
match self {
Form::Pair(_car, cdr) => Some(Rc::clone(cdr)),
_ => None,
}
}
pub fn is_nil(&self) -> bool {
fn is_nil(&self) -> bool {
match self {
Form::Nil => true,
_ => false,
}
}
pub fn append(&self, x: Rc<Form>) -> Option<Form> {
fn append(&self, x: Rc<Form>) -> Option<Rc<Form>> {
match self {
Form::Pair(car, cdr) => cdr.append(x).map(|x| Form::Pair(Rc::clone(car), Rc::new(x))),
Form::Nil => Some(Form::Pair(x, Rc::new(Form::Nil))),
Form::Pair(car, cdr) => cdr.append(x).map(|x| Rc::new(Form::Pair(Rc::clone(car), x))),
Form::Nil => Some(Rc::new(Form::Pair(x, Rc::new(Form::Nil)))),
_ => None,
}
}
fn assoc(k: &str, v: Rc<Form>, l: Rc<Form>) -> Rc<Form> {
Rc::new(Form::Pair(
Rc::new(Form::Pair(
Rc::new(Form::Symbol(k.to_owned())),
v)),
l))
}
fn impl_prim(ins: PrimCombI, e: Rc<Form>, ps: Rc<Form>, c: Cont<Form>, metac: Cont<Form>) -> Cursor<Form> {
match ins {
PrimCombI::Eval => Cursor { f: ps.car().unwrap(), c: Cont::Eval { e: ps.cdr().unwrap().car().unwrap(), nc: Box::new(c) }, metac },
PrimCombI::Vau => {
let de = ps.car().unwrap().sym().map(|s| s.to_owned());
let params = ps.cdr().unwrap().car().unwrap().sym().unwrap().to_owned();
let body = ps.cdr().unwrap().cdr().unwrap().car().unwrap();
Cursor { f: Rc::new(Form::DeriComb { se: e, de, params, body }), c: c, metac: metac }
},
PrimCombI::If => if ps.car().unwrap().truthy() {
Cursor { f: ps.cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
} else {
Cursor { f: ps.cdr().unwrap().cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
},
PrimCombI::Reset => Cursor { f: ps.car().unwrap(),
c: Cont::Eval { e: e, nc: Box::new(Cont::MetaRet) },
metac: Cont::CatchRet { nc: Box::new(c), restore_meta: Box::new(metac) } },
PrimCombI::Shift => Cursor { f: ps.car().unwrap(),
c: Cont::Call { p: Rc::new(Form::Pair(Rc::new(Form::ContComb(c)),
Rc::new(Form::Nil))),
e: e,
nc: Box::new(Cont::MetaRet) },
metac: Cont::CatchRet { nc: Box::new(metac.clone()), restore_meta: Box::new(metac) } },
PrimCombI::Cell => Cursor { f: Rc::new(Form::Cell(RefCell::new(ps.car().unwrap()))), c, metac },
PrimCombI::Set => match &*ps.car().unwrap() {
Form::Cell(cell) => Cursor { f: cell.replace(ps.cdr().unwrap().car().unwrap()), c: c, metac },
_ => panic!("set on not cell"),
},
PrimCombI::Get => match &*ps.car().unwrap() {
Form::Cell(cell) => Cursor { f: Rc::clone(&cell.borrow()), c: c, metac },
_ => panic!("get on not cell"),
},
PrimCombI::Cons => Cursor { f: Rc::new(Form::Pair(ps.car().unwrap(), ps.cdr().unwrap().car().unwrap())), c: c, metac },
PrimCombI::Car => Cursor { f: ps.car().unwrap().car().unwrap(), c: c, metac },
PrimCombI::Cdr => Cursor { f: ps.car().unwrap().cdr().unwrap(), c: c, metac },
PrimCombI::Quote => Cursor { f: ps.car().unwrap(), c: c, metac: metac },
PrimCombI::Assert => {
let thing = ps.car().unwrap();
if !thing.truthy() {
println!("Assert failed: {:?}", thing);
}
assert!(thing.truthy());
Cursor { f: ps.cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
},
PrimCombI::Eq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap() == ps.cdr().unwrap().car().unwrap())), c, metac },
PrimCombI::Lt => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() < ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::LEq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() <= ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Gt => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() > ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::GEq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() >= ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Plus => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() + ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Minus => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() - ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Mult => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() * ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Div => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() / ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Mod => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() % ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::And => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() & ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Or => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() | ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Xor => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() ^ ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::CombP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::PrimComb { eval_limit, ins } => true,
Form::DeriComb { .. } => true,
_ => false,
})), c, metac },
PrimCombI::CellP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Cell(_c) => true,
_ => false,
})), c, metac },
PrimCombI::PairP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Pair(_a,_b) => true,
_ => false,
})), c, metac },
PrimCombI::SymbolP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Symbol(_) => true,
_ => false,
})), c, metac },
PrimCombI::IntP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Int(_) => true,
_ => false,
})), c, metac },
PrimCombI::BoolP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Bool(_) => true,
_ => false,
})), c, metac },
PrimCombI::NilP => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().is_nil())), c, metac },
}
}
}
impl fmt::Display for Form {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -108,21 +251,34 @@ pub enum Form {
Pair(Rc<Form>,Rc<Form>),
PrimComb { eval_limit: i32, ins: PrimCombI },
DeriComb { se: Rc<Form>, de: Option<String>, params: String, body: Rc<Form> },
ContComb(Cont),
ContComb(Cont<Form>),
}
#[derive(Debug, Eq, PartialEq, Clone)]
pub enum Cont {
//#[derive(Debug, Eq, PartialEq, Clone)]
#[derive(Debug, Eq, PartialEq)]
pub enum Cont<F: FormT + ?Sized> {
Exit,
MetaRet,
CatchRet { nc: Box<Cont>, restore_meta: Box<Cont> },
Eval { e: Rc<Form>, nc: Box<Cont> },
Call { p: Rc<Form>, e: Rc<Form>, nc: Box<Cont> },
PramEval { eval_limit: i32, to_eval: Rc<Form>, collected: Option<Rc<Form>>, e: Rc<Form>, ins: PrimCombI, nc: Box<Cont> },
CatchRet { nc: Box<Cont<F>>, restore_meta: Box<Cont<F>> },
Eval { e: Rc<F>, nc: Box<Cont<F>> },
Call { p: Rc<F>, e: Rc<F>, nc: Box<Cont<F>> },
PramEval { eval_limit: i32, to_eval: Rc<F>, collected: Option<Rc<F>>, e: Rc<F>, ins: PrimCombI, nc: Box<Cont<F>> },
}
pub struct Cursor { f: Rc<Form>, c: Cont, metac: Cont }
impl<F: FormT> Clone for Cont<F> {
fn clone(&self) -> Self {
match self {
Cont::Exit => Cont::Exit,
Cont::MetaRet => Cont::MetaRet,
Cont::CatchRet { nc, restore_meta } => Cont::CatchRet { nc: nc.clone(), restore_meta: restore_meta.clone() },
Cont::Eval { e, nc } => Cont::Eval { e: Rc::clone(e), nc: nc.clone() },
Cont::Call { p, e, nc } => Cont::Call { p: Rc::clone(p), e: Rc::clone(e), nc: nc.clone() },
Cont::PramEval { eval_limit, to_eval, collected, e, ins, nc} => Cont::PramEval { eval_limit: *eval_limit, to_eval: Rc::clone(to_eval), collected: collected.as_ref().map(|x| Rc::clone(x)), e: Rc::clone(e), ins: ins.clone(), nc: nc.clone() },
}
}
}
pub struct Cursor<F: FormT + ?Sized> { f: Rc<F>, c: Cont<F>, metac: Cont<F> }
pub fn eval(e: Rc<Form>, f: Rc<Form>) -> Rc<Form> {
let mut cursor = Cursor { f, c: Cont::Eval { e, nc: Box::new(Cont::MetaRet) }, metac: Cont::Exit };
pub fn eval<F: FormT>(e: Rc<F>, f: Rc<F>) -> Rc<F> {
let mut cursor = Cursor::<F> { f, c: Cont::Eval { e, nc: Box::new(Cont::MetaRet) }, metac: Cont::Exit };
loop {
let Cursor { f, c, metac } = cursor;
match c {
@@ -137,16 +293,16 @@ pub fn eval(e: Rc<Form>, f: Rc<Form>) -> Rc<Form> {
},
Cont::PramEval { eval_limit, to_eval, collected, e, ins, nc } => {
let next_collected = if let Some(collected) = collected {
Rc::new(collected.append(f).unwrap())
} else { Rc::new(Form::Nil) };
collected.append(f).unwrap()
} else { F::nil() };
if eval_limit == 0 || to_eval.is_nil() {
let mut traverse = to_eval;
let mut next_collected = next_collected;
while !traverse.is_nil() {
next_collected = Rc::new(next_collected.append(traverse.car().unwrap()).unwrap());
next_collected = next_collected.append(traverse.car().unwrap()).unwrap();
traverse = traverse.cdr().unwrap();
}
cursor = impl_prim(ins, e, next_collected, *nc, metac);
cursor = F::impl_prim(ins, e, next_collected, *nc, metac);
} else {
cursor = Cursor { f: to_eval.car().unwrap(), c: Cont::Eval { e: Rc::clone(&e), nc: Box::new(Cont::PramEval { eval_limit: eval_limit - 1,
to_eval: to_eval.cdr().unwrap(),
@@ -155,58 +311,44 @@ pub fn eval(e: Rc<Form>, f: Rc<Form>) -> Rc<Form> {
}
},
Cont::Eval { e, nc } => {
match *f {
Form::Pair(ref comb, ref p) => {
cursor = Cursor { f: Rc::clone(comb), c: Cont::Eval { e: Rc::clone(&e), nc: Box::new(Cont::Call { p: Rc::clone(p), e: e, nc: nc }) }, metac }
},
Form::Symbol(ref s) => {
let mut t = Rc::clone(&e);
let mut dist = 0;
while s != t.car().unwrap().car().unwrap().sym().unwrap() {
t = t.cdr().unwrap();
dist += 1;
}
cursor = Cursor { f: t.car().unwrap().cdr().unwrap(), c: *nc, metac };
},
_ => {
cursor = Cursor { f: Rc::clone(&f), c: *nc, metac };
},
if let Some((comb, p)) = f.pair() {
cursor = Cursor { f: comb, c: Cont::Eval { e: Rc::clone(&e), nc: Box::new(Cont::Call { p, e, nc }) }, metac }
} else if let Some(s) = f.sym() {
let mut t = Rc::clone(&e);
let mut dist = 0;
while s != t.car().unwrap().car().unwrap().sym().unwrap() {
t = t.cdr().unwrap();
dist += 1;
}
cursor = Cursor { f: t.car().unwrap().cdr().unwrap(), c: *nc, metac };
} else {
cursor = Cursor { f: Rc::clone(&f), c: *nc, metac };
}
},
Cont::Call { p, e, nc } => {
match *f {
Form::PrimComb { eval_limit, ins } => {
cursor = Cursor { f: Rc::new(Form::Nil), c: Cont::PramEval { eval_limit, to_eval: p, collected: None, e, ins, nc: nc }, metac };
if let Some((eval_limit, ins)) = f.prim_comb() {
cursor = Cursor { f: F::nil(), c: Cont::PramEval { eval_limit, to_eval: p, collected: None, e, ins, nc: nc }, metac };
} else if let Some((se, de, params, body)) = f.deri_comb() {
let mut new_e = se;
if let Some(de) = de {
new_e = F::assoc(&de, Rc::clone(&e), new_e);
}
Form::DeriComb{ref se, ref de, ref params, ref body } => {
let mut new_e = Rc::clone(se);
if let Some(de) = de {
new_e = assoc(de, Rc::clone(&e), new_e);
}
new_e = assoc(params, p, new_e);
cursor = Cursor { f: Rc::clone(body), c: Cont::Eval { e: new_e, nc: nc }, metac };
},
Form::ContComb(ref c) => {
cursor = Cursor { f: p.car().unwrap(), c: Cont::Eval { e, nc: Box::new(c.clone()) }, metac: Cont::CatchRet { nc: nc, restore_meta: Box::new(metac) } };
},
_ => panic!("Tried to call not a Prim/DeriComb/ContComb {:?}, nc was {:?}", f, nc),
new_e = F::assoc(&params, p, new_e);
cursor = Cursor { f: body, c: Cont::Eval { e: new_e, nc: nc }, metac };
} else if let Some(c) = f.cont_comb() {
cursor = Cursor { f: p.car().unwrap(), c: Cont::Eval { e, nc: Box::new(c.clone()) }, metac: Cont::CatchRet { nc: nc, restore_meta: Box::new(metac) } };
} else {
panic!("Tried to call not a Prim/DeriComb/ContComb {:?}, nc was {:?}", f, nc);
}
},
}
}
}
pub fn assoc(k: &str, v: Rc<Form>, l: Rc<Form>) -> Rc<Form> {
Rc::new(Form::Pair(
Rc::new(Form::Pair(
Rc::new(Form::Symbol(k.to_owned())),
v)),
l))
}
pub fn assoc_vec(kvs: Vec<(&str, Rc<Form>)>) -> Rc<Form> {
let mut to_ret = Rc::new(Form::Nil);
for (k, v) in kvs {
to_ret = assoc(k, v, to_ret);
to_ret = Form::assoc(k, v, to_ret);
}
to_ret
}
@@ -254,98 +396,6 @@ pub enum PrimCombI {
NilP,
}
pub fn impl_prim(ins: PrimCombI, e: Rc<Form>, ps: Rc<Form>, c: Cont, metac: Cont) -> Cursor {
match ins {
PrimCombI::Eval => Cursor { f: ps.car().unwrap(), c: Cont::Eval { e: ps.cdr().unwrap().car().unwrap(), nc: Box::new(c) }, metac },
PrimCombI::Vau => {
let de = ps.car().unwrap().sym().map(|s| s.to_owned());
let params = ps.cdr().unwrap().car().unwrap().sym().unwrap().to_owned();
let body = ps.cdr().unwrap().cdr().unwrap().car().unwrap();
Cursor { f: Rc::new(Form::DeriComb { se: e, de, params, body }), c: c, metac: metac }
},
PrimCombI::If => if ps.car().unwrap().truthy() {
Cursor { f: ps.cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
} else {
Cursor { f: ps.cdr().unwrap().cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
},
PrimCombI::Reset => Cursor { f: ps.car().unwrap(),
c: Cont::Eval { e: e, nc: Box::new(Cont::MetaRet) },
metac: Cont::CatchRet { nc: Box::new(c), restore_meta: Box::new(metac) } },
PrimCombI::Shift => Cursor { f: ps.car().unwrap(),
c: Cont::Call { p: Rc::new(Form::Pair(Rc::new(Form::ContComb(c)),
Rc::new(Form::Nil))),
e: e,
nc: Box::new(Cont::MetaRet) },
metac: Cont::CatchRet { nc: Box::new(metac.clone()), restore_meta: Box::new(metac) } },
PrimCombI::Cell => Cursor { f: Rc::new(Form::Cell(RefCell::new(ps.car().unwrap()))), c, metac },
PrimCombI::Set => match &*ps.car().unwrap() {
Form::Cell(cell) => Cursor { f: cell.replace(ps.cdr().unwrap().car().unwrap()), c: c, metac },
_ => panic!("set on not cell"),
},
PrimCombI::Get => match &*ps.car().unwrap() {
Form::Cell(cell) => Cursor { f: Rc::clone(&cell.borrow()), c: c, metac },
_ => panic!("get on not cell"),
},
PrimCombI::Cons => Cursor { f: Rc::new(Form::Pair(ps.car().unwrap(), ps.cdr().unwrap().car().unwrap())), c: c, metac },
PrimCombI::Car => Cursor { f: ps.car().unwrap().car().unwrap(), c: c, metac },
PrimCombI::Cdr => Cursor { f: ps.car().unwrap().cdr().unwrap(), c: c, metac },
PrimCombI::Quote => Cursor { f: ps.car().unwrap(), c: c, metac: metac },
PrimCombI::Assert => {
let thing = ps.car().unwrap();
if !thing.truthy() {
println!("Assert failed: {:?}", thing);
}
assert!(thing.truthy());
Cursor { f: ps.cdr().unwrap().car().unwrap(), c: Cont::Eval { e: e, nc: Box::new(c) }, metac }
},
PrimCombI::Eq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap() == ps.cdr().unwrap().car().unwrap())), c, metac },
PrimCombI::Lt => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() < ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::LEq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() <= ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Gt => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() > ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::GEq => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().int().unwrap() >= ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Plus => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() + ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Minus => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() - ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Mult => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() * ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Div => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() / ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Mod => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() % ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::And => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() & ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Or => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() | ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::Xor => Cursor { f: Rc::new(Form::Int(ps.car().unwrap().int().unwrap() ^ ps.cdr().unwrap().car().unwrap().int().unwrap())), c, metac },
PrimCombI::CombP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::PrimComb { eval_limit, ins } => true,
Form::DeriComb { .. } => true,
_ => false,
})), c, metac },
PrimCombI::CellP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Cell(_c) => true,
_ => false,
})), c, metac },
PrimCombI::PairP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Pair(_a,_b) => true,
_ => false,
})), c, metac },
PrimCombI::SymbolP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Symbol(_) => true,
_ => false,
})), c, metac },
PrimCombI::IntP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Int(_) => true,
_ => false,
})), c, metac },
PrimCombI::BoolP => Cursor { f: Rc::new(Form::Bool(match &*ps.car().unwrap() {
Form::Bool(_) => true,
_ => false,
})), c, metac },
PrimCombI::NilP => Cursor { f: Rc::new(Form::Bool(ps.car().unwrap().is_nil())), c, metac },
}
}
// Have eval?/maybe Cont?/maybe Cursor? parameterized on value type?

22
kv/src/grammar.lalrpop
View File

@@ -1,22 +1,22 @@
use std::str::FromStr;
use std::rc::Rc;
use crate::ast::Form;
use crate::ast::{Form,FormT};
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(Form::Pair(Rc::new(<>), Rc::new(Form::Nil)))),
pub Term: Rc<Form> = {
NUM => Rc::new(Form::Int(i32::from_str(<>).unwrap())),
SYM => Rc::new(Form::Symbol(<>.to_owned())),
"(" <ListInside?> ")" => <>.unwrap_or(Rc::new(Form::Nil)),
"'" <Term> => Rc::new(Form::Pair(Rc::new(Form::Symbol("quote".to_owned())), Rc::new(Form::Pair(<>, Rc::new(Form::Nil))))),
"!" <h: Term> <t: Term> => {
h.append(Rc::new(t)).unwrap()
h.append(t).unwrap()
},
};
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)),
ListInside: Rc<Form> = {
<Term> => Rc::new(Form::Pair(<>, Rc::new(Form::Nil))),
<h: Term> <t: ListInside> => Rc::new(Form::Pair(h, t)),
<a: Term> "." <d: Term> => Rc::new(Form::Pair(a, d)),
}
match {
"(",