Delete some unneeded code
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0c64b14be0
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48a35aa382
@ -92,18 +92,12 @@ impl EvaluatorState {
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fn eval(&mut self, expr: Sexp) -> Result<Sexp, String> {
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use self::Sexp::*;
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Ok(match expr {
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SymbolAtom(ref sym) => {
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if let Some(op) = get_builtin(sym) {
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Primitive(op)
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} else {
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match self.get_var(sym) {
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Some(ref sexp) => {
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let q: &Sexp = sexp; //WTF? if I delete this line, the copy doesn't work??
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q.clone() //TODO make this not involve a clone
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},
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None => return Err(format!("Variable {} not bound", sym)),
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}
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}
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SymbolAtom(ref sym) => match self.get_var(sym) {
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Some(ref sexp) => {
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let q: &Sexp = sexp; //WTF? if I delete this line, the copy doesn't work??
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q.clone() //TODO make this not involve a clone
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},
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None => return Err(format!("Variable {} not bound", sym)),
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},
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expr @ Primitive(_) => expr,
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expr @ FnLiteral { .. } => expr,
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@ -313,15 +307,6 @@ enum PrimitiveFn {
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Plus, Minus, Mult, Div, Mod, Greater, Less, GreaterThanOrEqual, LessThanOrEqual
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}
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fn get_builtin(sym: &String) -> Option<PrimitiveFn> {
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use self::PrimitiveFn::*;
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Some(match &sym[..] {
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"+" => Plus, "-" => Minus, "*" => Mult, "/" => Div, "%" => Mod,
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">" => Greater, "<" => Less, ">=" => GreaterThanOrEqual, "<=" => LessThanOrEqual,
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_ => return None
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})
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}
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impl Sexp {
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fn print(&self) -> String {
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use self::Sexp::*;
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