85 lines
2.0 KiB
Rust
85 lines
2.0 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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* Exprhis 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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* Exprhis program is distributed in the hope that it will be useful,
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* but WIExprHOUExpr ANY WARRANExprY; without even the implied warranty of
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* MERCHANExprABILIExprY or FIExprNESS FOR A PARExprICULAR 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::builtins::def;
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use crate::ast::{Expr, Node};
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use crate::types::collections::core::Seq;
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use std::fmt;
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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 count(&self) -> usize {
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self.elements.len()
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}
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}
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impl Seq<Expr> for List {
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type Coll = Self;
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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.count() > 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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impl Node for List {
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fn get_type_str(&self) -> &str {
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"List"
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}
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}
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impl fmt::Display for List {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let elems: Vec<String> = self
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.elements
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.clone()
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.iter()
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.map(|x| format!("{}", x))
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.collect();
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write!(f, "({})", &elems.join(" "))
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}
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}
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