better organization and try a tex readme

Signed-off-by: Ava Hahn <ava@aidanis.online>

legacy_snippets/seperate_tables/vars.rs

@@ -1,120 +0,0 @@
-/* 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, Function, Operation};
-use crate::segment::{Seg, Ctr};
-use std::collections::HashMap;
-use std::env;
-use lazy_static::lazy_static;
-
-lazy_static! {
-    pub static ref VAR_TABLE: VTable<'static> = {
-        VTable::new()
-    };
-}
-
-/* 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 struct VTable<'a>(HashMap<String, Box<Ctr<'a>>>);
-
-impl<'a, 'b> VTable<'a> {
-    // WARNING: make sure var_tree is properly evaluated before storing
-    pub fn insert(&'a mut self, identifier: String, data: Box<Ctr<'a>>) {
-        if let Some(datum) = self.0.insert(identifier, data) {
-            drop(datum);
-        }
-    }
-
-    pub fn get(&'a self, id: String) -> Option<Box<Ctr<'b>>> {
-        match self.0.get(&id) {
-            Some(s) => Some(s.clone()),
-            None => None,
-        }
-    }
-
-    pub fn remove(&mut self, id: String) {
-        self.0.remove(&id);
-    }
-
-    pub fn new() -> VTable<'a> {
-        VTable{0: HashMap::<String, Box<Ctr>>::new()}
-    }
-}
-
-// the stdlib var export function with env_sync on
-lazy_static! {
-    pub static ref LIB_EXPORT_ENV: Function = Function {
-        name: String::from("export"),
-        loose_syms: true,
-        eval_lazy: true,
-        args: Args::Lazy(2),
-        function: Operation::Internal(Box::new( move |ast: &Seg| -> Ctr {
-                _export_callback(ast, true)
-            },
-        )),
-    };
-}
-
-// the stdlib var export function with env_sync off
-lazy_static! {
-    pub static ref LIB_EXPORT_NO_ENV: Function = Function {
-        name: String::from("export"),
-        loose_syms: true,
-        eval_lazy: true,
-        args: Args::Lazy(2),
-        function: Operation::Internal(Box::new( move |ast: &Seg| -> Ctr {
-                _export_callback(ast, false)
-            },
-        )),
-    };
-}
-
-
-fn _export_callback<'a> (ast: &Seg, env_cfg: bool) -> Ctr<'a> {
-    if let Ctr::Symbol(ref identifier) = *ast.car {
-        match &*ast.cdr {
-            Ctr::Seg(data_tree) => match eval(&Box::new(data_tree), false, true) {
-                Ok(seg) => match *seg {
-                    Ctr::Seg(val) => {
-                        SYM_TABLE.declare(Symbol {
-                            value: UserVar(val.car),
-                            name: identifier.clone(),
-                        });
-                        if env_cfg {
-                            env::set_var(identifier.clone(), val.car.to_string())
-                        }
-                    },
-                    _ =>  eprintln!("impossible args to export"),
-                },
-                Err(e) =>  eprintln!("couldnt eval symbol: {}", e),
-            },
-            Ctr::None => {
-                VAR_TABLE.remove(identifier.to_string());
-                if env_cfg {
-                    env::remove_var(identifier.to_string());
-                }
-            },
-            _ =>  eprintln!("args not in standard form"),
-        }
-    } else {
-        eprintln!("first argument to export must be a symbol");
-    }
-    return Ctr::None;
-}