From b5f469de182a3e95b2d968ddccf2e2f9b77a3dc2 Mon Sep 17 00:00:00 2001
From: Joel Martin <github@martintribe.org>
Date: Thu, 10 Apr 2014 21:12:17 -0500
Subject: Ruby: add step3

---
 ruby/env.rb | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 ruby/env.rb

(limited to 'ruby/env.rb')

diff --git a/ruby/env.rb b/ruby/env.rb
new file mode 100644
index 0000000..dfd5ec9
--- /dev/null
+++ b/ruby/env.rb
@@ -0,0 +1,28 @@
+class Env
+    attr_accessor :data
+    def initialize(outer=nil, binds=[], exprs=[])
+        @data = {}
+        @outer = outer
+    end
+
+    def find(key)
+        if @data.key? key
+            return self
+        elsif @outer
+            return @outer.find(key)
+        else
+            return nil
+        end
+    end
+
+    def set(key, value)
+        @data[key] = value
+        return value
+    end
+
+    def get(key)
+        env = find(key)
+        raise "'" + key.to_s + "' not found" if not env
+        env.data[key]
+    end
+end
-- 
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