From 044f534ac5ea9bf644df6bb1f33ff05aec01d14c Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Thu, 21 Jan 2016 01:16:01 -0800
Subject: [PATCH] Start implementing variable lookup

---
 src/eval.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/eval.rs b/src/eval.rs
index 6bc9016..143718b 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -7,7 +7,9 @@ struct Varmap {
 
 impl Varmap {
     fn new() -> Varmap {
-        Varmap { map: HashMap::new() }
+        let mut map = HashMap::new();
+        map.insert("a".to_string(), Expression::Number(10.0));
+        Varmap { map: map }
     }
 
     fn add_binding(&mut self, var: String, value: Expression) {
@@ -97,7 +99,10 @@ impl Evaluator {
         match expression {
             e@StringLiteral(_) => e,
             e@Number(_) => e,
-            Variable(var) => Number(20.0),
+            Variable(var) => {
+                let expr = self.varmap.lookup_binding(var).unwrap();
+                expr.clone()
+            },
             _ => unimplemented!(),
         }