70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
/* Serene --- Yet an other Lisp
|
|
*
|
|
* Copyright (c) 2020 Sameer Rahmani <lxsameer@gnu.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
use crate::ast::{Expr, Expression, PossibleExpr, StringRepr};
|
|
use crate::errors::err;
|
|
use crate::reader::read_string;
|
|
use crate::runtime::RT;
|
|
use crate::scope::Scope;
|
|
|
|
fn eval_expr(rt: &RT, scope: &Scope, expr: Expr) -> PossibleExpr {
|
|
match expr {
|
|
Expr::Num(n) => n.eval(rt, scope),
|
|
// TODO: find a better way to attach the ns name to the symbol. This
|
|
// is ugly.
|
|
Expr::Sym(s) => s
|
|
.clone_with_ns(rt.current_ns().name.clone())
|
|
.eval(rt, scope),
|
|
_ => Ok(expr),
|
|
}
|
|
}
|
|
|
|
pub fn eval(rt: &RT, exprs: Vec<Expr>) -> PossibleExpr {
|
|
if exprs.len() == 0 {
|
|
return Ok(Expr::NoMatch);
|
|
}
|
|
|
|
let mut ret: PossibleExpr = Ok(Expr::NoMatch);
|
|
|
|
for expr in exprs.iter() {
|
|
ret = eval_expr(rt, rt.current_scope(), expr.clone());
|
|
}
|
|
|
|
ret
|
|
}
|
|
|
|
pub fn read_eval_print(rt: &RT, input: &str) {
|
|
match read_string(input) {
|
|
Ok(exprs) => {
|
|
if rt.is_debug() {
|
|
println!("Read Result: \n{:?}\n", exprs);
|
|
}
|
|
|
|
let result_expr = eval(rt, exprs);
|
|
|
|
if rt.is_debug() {
|
|
println!("Eval Result: \n{:?}\n", result_expr);
|
|
}
|
|
|
|
match result_expr {
|
|
Ok(expr) => println!("{}", expr.string_repr(rt)),
|
|
Err(e) => println!("{}", e),
|
|
}
|
|
}
|
|
Err(e) => println!("Error: {}", e),
|
|
}
|
|
}
|