/** 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};
use crate::runtime::RT;
use crate::scope::Scope;

#[derive(Debug, Clone)]
pub struct Symbol {
    pub name: String,
}

impl PartialEq for Symbol {
    fn eq(&self, other: &Self) -> bool {
        self.name == other.name
    }
}

impl Eq for Symbol {}

impl Expression for Symbol {
    fn eval(&self, rt: &RT, scope: &Scope) -> PossibleExpr {
        Ok(Expr::Sym(self.clone()))
    }
}

impl Symbol {
    pub fn new(name: String) -> Self {
        Symbol { name }
    }

    pub fn is_def(&self) -> bool {
        self.name == "def"
    }
}