Created necessary data structures and utilities for integers and their operations; added tests for them

1 files changed, 27 insertions, 0 deletions

diff --git a/src/sexp/util.rs b/src/sexp/util.rs
new file mode 100644
index 0000000..a4e3ab4
--- /dev/null
+++ b/src/sexp/util.rs
@@ -0,0 +1,27 @@
+
+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 sexp(x: impl Into<Box<SExp>>, y: impl Into<Box<SExp>>) -> SExp {
+    SCons(x.into(), y.into())
+}