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Kill some old code, make very_simple example print

This commit is contained in:
greg 2018-05-12 01:02:44 -07:00
parent b1966d7199
commit 1a84f62818
2 changed files with 2 additions and 77 deletions
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77
schala-lang/src/eval.rs
View File

@ -25,34 +25,11 @@ enum ValueEntry {
Binding {
constant: bool,
val: /*FullyEvaluatedExpr*/ Expr,
},
/*
Function {
param_names: Vec<Rc<String>>,
body: Vec<Statement>,
}
*/
}
type EvalResult<T> = Result<T, String>;
/*
impl<'a> State<'a> {
fn insert(&mut self, name: Rc<String>, value: ValueEntry) {
self.values.insert(name, value);
}
fn lookup(&self, name: &Rc<String>) -> Option<&ValueEntry> {
match (self.values.get(name), self.parent_frame) {
(None, None) => None,
(None, Some(parent)) => parent.lookup(name),
(Some(value), _) => Some(value),
}
}
}
*/
/*
#[derive(Debug, PartialEq, Clone)]
@ -288,46 +265,6 @@ impl<'a> State<'a> {
}
}
fn eval_binexp(&mut self, op: BinOp, lhs: Box<Expression>, rhs: Box<Expression>) -> EvalResult<FullyEvaluatedExpr> {
use self::FullyEvaluatedExpr::*;
let evaled_lhs = self.eval_expr(*lhs)?;
let evaled_rhs = self.eval_expr(*rhs)?;
let sigil = op.sigil();
//let sigil: &str = op.sigil().as_ref().as_str();
Ok(match (sigil.as_str(), evaled_lhs, evaled_rhs) {
("+", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l + r),
("++", Str(s1), Str(s2)) => Str(format!("{}{}", s1, s2)),
("-", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l - r),
("*", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l * r),
("/", UnsignedInt(l), UnsignedInt(r)) => Float((l as f64)/ (r as f64)),
("//", UnsignedInt(l), UnsignedInt(r)) => if r == 0 {
return Err(format!("Runtime error: divide by zero"));
} else {
UnsignedInt(l / r)
},
("%", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l % r),
("^", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l ^ r),
("&", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l & r),
("|", UnsignedInt(l), UnsignedInt(r)) => UnsignedInt(l | r),
_ => return Err(format!("Runtime error: not yet implemented")),
})
}
fn eval_prefix_exp(&mut self, op: PrefixOp, expr: Box<Expression>) -> EvalResult<FullyEvaluatedExpr> {
use self::FullyEvaluatedExpr::*;
let evaled_expr = self.eval_expr(*expr)?;
let sigil = op.sigil();
Ok(match (sigil.as_str(), evaled_expr) {
("!", Bool(true)) => Bool(false),
("!", Bool(false)) => Bool(true),
("-", UnsignedInt(n)) => SignedInt(-1*(n as i64)),
("-", SignedInt(n)) => SignedInt(-1*(n as i64)),
("+", SignedInt(n)) => SignedInt(n),
("+", UnsignedInt(n)) => UnsignedInt(n),
_ => return Err(format!("Runtime error: not yet implemented")),
})
}
}
*/
@ -454,7 +391,7 @@ impl<'a> State<'a> {
("+", &[Lit(Int(n))]) => Lit(Int(n)),
("+", &[Lit(Nat(n))]) => Lit(Nat(n)),
_ => return Err(format!("Runtime error: not yet implemented")),
_ => return Err(format!("Runtime error: bad or unimplemented builtin")),
})
}
@ -473,16 +410,4 @@ impl<'a> State<'a> {
}
}
}
/*
fn eval_value(&mut self, name: Rc<String>) -> EvalResult<FullyEvaluatedExpr> {
use self::ValueEntry::*;
match self.lookup(&name) {
None => return Err(format!("Value {} not found", *name)),
Some(lookup) => match lookup {
&Binding { ref val } => Ok(val.clone()),
&Function { .. } => Ok(FullyEvaluatedExpr::FuncLit(name.clone()))
}
}
}
*/
}

2
source_files/schala/very_simple.schala
View File

@ -1,4 +1,4 @@
const a = 10
a + 8
print(a + 8)