Function parse 

pub fn parse<'a>(
    ctx: &'a AtomArena<'a>,
    input: &'a str,
) -> Result<Atom<'a>, ParseError>

Parse an expression string into an Atom.

Errors

Returns a ParseError if the input cannot be lexed or parsed.

Example

use ocas_atom::AtomArena;
use ocas_core::arena::Arena;
use ocas_parse::parse;

let arena = Arena::new();
let ctx = AtomArena::new(&arena);
let expr = parse(&ctx, "x^2 + 2*x + 1").unwrap();
assert_eq!(expr.to_string(), "((x^2) + (2*x)) + 1");