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print, println as builtins

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greg 2018-05-12 01:18:44 -07:00
parent 1a84f62818
commit e0cec8b8a6
1 changed files with 20 additions and 1 deletions
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21
schala-lang/src/eval.rs
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@ -10,9 +10,18 @@ pub struct State<'a> {
values: StateStack<'a, Rc<String>, ValueEntry>
}
macro_rules! builtin_binding {
($name:expr, $values:expr) => {
$values.insert(Rc::new(format!($name)), ValueEntry::Binding { constant: true, val: Expr::Func(Func::BuiltIn(Rc::new(format!($name)))) });
}
}
impl<'a> State<'a> {
pub fn new() -> State<'a> {
State { values: StateStack::new(Some(format!("global"))) }
let mut values = StateStack::new(Some(format!("global")));
builtin_binding!("print", values);
builtin_binding!("println", values);
State { values }
}
pub fn debug_print(&self) -> String {
@ -391,6 +400,16 @@ impl<'a> State<'a> {
("+", &[Lit(Int(n))]) => Lit(Int(n)),
("+", &[Lit(Nat(n))]) => Lit(Nat(n)),
/* builtin functions */
("print", &[ref anything]) => {
print!("{}", anything.to_repl());
Expr::Unit
},
("println", &[ref anything]) => {
println!("{}", anything.to_repl());
Expr::Unit
},
_ => return Err(format!("Runtime error: bad or unimplemented builtin")),
})
}