src/sexp/mod.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34


pub mod step;
pub mod util;
pub mod subst;

/// A leaf node for S-Expressions.
///
/// May represent built-in operators,
/// variables, functions (to be added) or values.
#[derive(Debug)]
#[derive(PartialEq)]
#[derive(Clone)]
pub enum SLeaf {
    Add,
    Sub,
    Mul,
    Div,
    Int(i32),
    Var(String),
    Quote,
    Nil,
}

/// An S-Expression; the defining structure of the language.
///
/// This structure is not intended to correspond with
/// IETF-standardized s-expressions; they are only inspiration.
#[derive(Debug)]
#[derive(PartialEq)]
#[derive(Clone)]
pub enum SExp {
    SCons(Box<SExp>, Box<SExp>),
    Atom(SLeaf),
}