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better organization and try a tex readme

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Signed-off-by: Ava Hahn <ava@aidanis.online>
This commit is contained in:
Ava Hahn 2023-03-01 11:21:30 -08:00
parent a489cb85c9
commit 38b941b6cb
Signed by untrusted user who does not match committer: affine
GPG key ID: 3A4645B8CF806069
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111
legacy_snippets/initial_rough_spaghetti_implementation/vars.rs
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/* relish: versatile lisp shell
* Copyright (C) 2021 Aidan Hahn
*
* 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 3 of the License, or
* (at your option) any later version.
*
* 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::eval::eval;
use crate::func::{Args, FTable, Function, Operation};
use crate::segment::{ast_to_string, Ast, Ctr};
use std::cell::RefCell;
use std::collections::HashMap;
use std::env;
use std::rc::Rc;
/* Mapping between a string token and a tree of Segments
* The string token can be found in any Ctr::Symbol value
* it is expected that the trees stored are already evaluated
*/
pub type VTable = HashMap<String, Rc<Ctr>>;
// WARNING: make sure var_tree is properly evaluated before storing
pub fn define(vt: Rc<RefCell<VTable>>, identifier: String, var_tree: Rc<Ctr>) {
if let Some(rc_segment) = vt.borrow_mut().insert(identifier, var_tree) {
drop(rc_segment);
}
}
pub fn get_export(env_cfg: bool) -> Function {
// This is the most hilarious way to work around the lifetime of env_cfg
// TODO: figure out the RUSTEY way of doing this
if env_cfg {
return Function {
name: String::from("export"),
loose_syms: true,
eval_lazy: true,
args: Args::Lazy(2),
function: Operation::Internal(Box::new(
|a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>| -> Ctr {
export_callback(true, a, b, c)
},
)),
};
} else {
return Function {
name: String::from("export"),
loose_syms: true,
eval_lazy: true,
args: Args::Lazy(2),
function: Operation::Internal(Box::new(
|a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>| -> Ctr {
export_callback(false, a, b, c)
},
)),
};
}
}
fn export_callback(env_cfg: bool, a: Ast, b: Rc<RefCell<VTable>>, c: Rc<RefCell<FTable>>) -> Ctr {
let inner = a.borrow_mut();
match &inner.car {
Ctr::Symbol(identifier) => {
match &inner.cdr {
Ctr::Seg(tree) => match eval(tree.clone(), b.clone(), c.clone(), false) {
Ok(seg) => match seg {
Ctr::Seg(val) => {
define(b, identifier.to_string(), Rc::new(val.borrow().clone().car));
if env_cfg {
match val.borrow().clone().car {
Ctr::Symbol(s) => env::set_var(identifier, s),
Ctr::String(s) => env::set_var(identifier, s),
Ctr::Integer(i) => env::set_var(identifier, format!("{}", i)),
Ctr::Float(f) => env::set_var(identifier, format!("{}", f)),
Ctr::Bool(b) => env::set_var(identifier, format!("{}", b)),
Ctr::Seg(c) => env::set_var(identifier, ast_to_string(c)),
Ctr::None => (),
}
}
}
_ => eprintln!("impossible args to export"),
},
Err(e) => eprintln!("couldnt eval symbol: {}", e),
},
Ctr::None => {
(*b).borrow_mut().remove(identifier);
if env_cfg {
// TODO: unset variable
}
}
_ => eprintln!("args not in standard form"),
}
}
_ => eprintln!("first argument to export must be a symbol"),
}
return Ctr::None;
}