ca4c557d95
* Fix up project structures * combine vars and funcs table * make a place for old code that may be useful to reference * singleton pattern for sym table Commentary: When this change is finally finished I promise to use feature branches from here on out
111 lines
4.2 KiB
Rust
111 lines
4.2 KiB
Rust
/* relish: versatile lisp shell
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* Copyright (C) 2021 Aidan Hahn
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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 3 of the License, or
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* (at your option) any later version.
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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::eval::eval;
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use crate::func::{Args, FTable, Function, Operation};
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use crate::segment::{ast_to_string, Ast, Ctr};
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::env;
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use std::rc::Rc;
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/* Mapping between a string token and a tree of Segments
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* The string token can be found in any Ctr::Symbol value
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* it is expected that the trees stored are already evaluated
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*/
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pub type VTable = HashMap<String, Rc<Ctr>>;
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// WARNING: make sure var_tree is properly evaluated before storing
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pub fn define(vt: Rc<RefCell<VTable>>, identifier: String, var_tree: Rc<Ctr>) {
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if let Some(rc_segment) = vt.borrow_mut().insert(identifier, var_tree) {
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drop(rc_segment);
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}
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}
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pub fn get_export(env_cfg: bool) -> Function {
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// This is the most hilarious way to work around the lifetime of env_cfg
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// TODO: figure out the RUSTEY way of doing this
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if env_cfg {
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return Function {
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name: String::from("export"),
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loose_syms: true,
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eval_lazy: true,
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args: Args::Lazy(2),
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function: Operation::Internal(Box::new(
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|a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>| -> Ctr {
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export_callback(true, a, b, c)
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},
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)),
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};
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} else {
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return Function {
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name: String::from("export"),
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loose_syms: true,
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eval_lazy: true,
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args: Args::Lazy(2),
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function: Operation::Internal(Box::new(
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|a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>| -> Ctr {
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export_callback(false, a, b, c)
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},
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)),
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};
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}
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}
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fn export_callback(env_cfg: bool, a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>) -> Ctr {
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let inner = a.borrow_mut();
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match &inner.car {
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Ctr::Symbol(identifier) => {
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match &inner.cdr {
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Ctr::Seg(tree) => match eval(tree.clone(), b.clone(), c.clone(), false) {
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Ok(seg) => match seg {
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Ctr::Seg(val) => {
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define(b, identifier.to_string(), Rc::new(val.borrow().clone().car));
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if env_cfg {
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match val.borrow().clone().car {
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Ctr::Symbol(s) => env::set_var(identifier, s),
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Ctr::String(s) => env::set_var(identifier, s),
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Ctr::Integer(i) => env::set_var(identifier, format!("{}", i)),
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Ctr::Float(f) => env::set_var(identifier, format!("{}", f)),
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Ctr::Bool(b) => env::set_var(identifier, format!("{}", b)),
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Ctr::Seg(c) => env::set_var(identifier, ast_to_string(c)),
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Ctr::None => (),
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}
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}
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}
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_ => eprintln!("impossible args to export"),
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},
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Err(e) => eprintln!("couldnt eval symbol: {}", e),
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},
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Ctr::None => {
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(*b).borrow_mut().remove(identifier);
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if env_cfg {
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// TODO: unset variable
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}
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}
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_ => eprintln!("args not in standard form"),
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}
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}
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_ => eprintln!("first argument to export must be a symbol"),
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}
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return Ctr::None;
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}
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