in progress commit

- added vars to lib
- fixed adders and getters to both vtable and ftable
- made function operations a dual type (enum)
- prototyped calling of stored external ASTs with
arguments (additional operation type
- stub for eval
- added index function to Cell

src/lex.rs

@@ -23,10 +23,6 @@ const UNMATCHED_LIST_DELIM: &str = "Unmatched list delimiter in input";
 
 /* takes a line of user input
  * returns an unsimplified tree of tokens.
- *
- * WARNING: lex and process ONLY SUPPORT ASCII CHARACTERS.
- * Unicode and other technology where one rune can take multiple indexes
- * can cause havoc if part of a rune matches a whitespace or other operator
  */
 pub fn lex(document: String) -> Result<Box<Cell>, String> {
     if !document.is_ascii() {
@@ -46,8 +42,6 @@ pub fn lex(document: String) -> Result<Box<Cell>, String> {
 /* The logic used in lex
  * Returns Ok(Box<Cell>) if lexing passes
  * Returns Err(String) if an error occurs
- *
- * WARNING: read docs for lex
  */
 fn process(document: String) -> Result<Box<Cell>, String> {
     let doc_len = document.len();