| //! In this example we build an [S-expression](https://en.wikipedia.org/wiki/S-expression) | |
| //! parser and tiny [lisp](https://en.wikipedia.org/wiki/Lisp_(programming_language)) interpreter. | |
| //! Lisp is a simple type of language made up of Atoms and Lists, forming easily parsable trees. | |
| #![cfg(feature = "alloc")] | |
| mod parser; | |
| fn main() { | |
| let expression_1 = "((if (= (+ 3 (/ 9 3)) | |
| (* 2 3)) | |
| * | |
| /) | |
| 456 123)"; | |
| println!( | |
| "\"{}\"\nevaled gives us: {:?}", | |
| expression_1, | |
| parser::eval_from_str(expression_1) | |
| ); | |
| } |