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Some primitive implementations

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greg 2017-12-07 19:48:48 -08:00
parent c3919daa66
commit fcd980f148
1 changed files with 16 additions and 9 deletions
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25
src/rukka_lang/mod.rs
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@ -49,28 +49,35 @@ impl EvaluatorState {
fn new() -> EvaluatorState { EvaluatorState { } }
fn eval(&mut self, expr: Sexp) -> Result<Sexp, String> {
use self::Sexp::*;
println!("Eval'd sexp: {:?}", expr);
Ok(match expr {
SymbolAtom(sym) => unimplemented!(),
expr @ StringAtom(_) => expr,
expr @ NumberAtom(_) => expr,
Cons(box car, box cdr) => {
match car {
Cons(box operator, box operands) => {
match operator {
SymbolAtom(ref sym) => match &sym[..] {
"quote" => cdr,
"quote" => operands,
"eq?" => unimplemented!(),
"cons" => match cdr {
"cons" => match operands {
Cons(box cadr, box Cons(box caddr, box Nil)) => {
println!("NEWL {:?}|| NEWR {:?}", cadr, caddr);
let newl = self.eval(cadr)?;
let newr = self.eval(caddr)?;
Cons(Box::new(newl), Box::new(newr))
},
_ => return Err(format!("Bad arguments for cons")),
},
"car" => unimplemented!(),
"cdr" => unimplemented!(),
"atom?" => unimplemented!(),
"car" => match operands {
Cons(box car, _) => car,
_ => return Err(format!("called car with a non-pair argument")),
},
"cdr" => match operands {
Cons(_, box cdr) => cdr,
_ => return Err(format!("called cdr with a non-pair argument")),
},
"atom?" => match operands {
Cons(_, _) => SymbolAtom(format!("#f")),
_ => SymbolAtom(format!("#t")),
},
"define" => unimplemented!(),
"lambda" => unimplemented!(),
"cond" => unimplemented!(),