src/sexp/util.rs


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use crate::sexp::SExp;
use crate::sexp::SLeaf;
use crate::sexp::SExp::*;
use crate::sexp::SLeaf::*;

impl From<i32> for Box<SExp> {
    fn from(int: i32) -> Self {
        Box::new(Atom(Int(int)))
    }
}

impl From<SLeaf> for Box<SExp> {
    fn from(leaf: SLeaf) -> Self {
        Box::new(Atom(leaf))
    }
}

impl From<i32> for SLeaf {
    fn from(int: i32) -> Self {
        Int(int)
    }
}

pub fn scons(x: impl Into<Box<SExp>>, y: impl Into<Box<SExp>>) -> SExp {
    SCons(x.into(), y.into())
}

pub fn var(name: &str) -> SExp {
    Atom(Var(name.to_string()))
}