70 lines
1.7 KiB
Rust
70 lines
1.7 KiB
Rust
/** Serene --- Yet an other Lisp
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*
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* Copyright (c) 2020 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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use crate::ast::Expr;
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use crate::builtins::def;
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use crate::compiler::Compiler;
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use crate::types::collections::core::Seq;
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use crate::types::core::Expression;
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#[derive(Debug, Eq, PartialEq, Clone)]
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pub struct List {
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elements: Vec<Expr>,
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}
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impl List {
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pub fn new_empty() -> List {
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List { elements: vec![] }
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}
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pub fn new(elems: &[Expr]) -> List {
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List {
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elements: elems.to_vec(),
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}
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}
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pub fn push(&mut self, elem: Expr) {
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self.elements.push(elem)
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}
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pub fn length(&self) -> usize {
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self.elements.len()
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}
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}
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impl Expression for List {
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fn eval() {}
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}
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impl Seq<Expr> for List {
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type Coll = List;
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fn first(&self) -> Option<Expr> {
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match self.elements.first() {
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Some(e) => Some(e.clone()),
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None => None,
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}
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}
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fn rest(&self) -> List {
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if self.length() > 0 {
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List::new(&self.elements[1..])
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} else {
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List::new_empty()
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}
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}
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}
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